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          * @var bool: Whether parser output should contain table of contents
 260          */
 261         private $mEnableTOC = true;
 262
 263         /**
 264          * @var bool: Whether parser output should contain section edit links
 265          */
 266         private $mEnableSectionEditLinks = true;
 267
 268         /**
 269          * Constructor for OutputPage. This should not be called directly.
 270          * Instead a new RequestContext should be created and it will implicitly create
 271          * a OutputPage tied to that context.
 272          */
 273         function __construct( IContextSource $context = null ) {
 274                 if ( $context === null ) {
 275                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 276                         wfDeprecated( __METHOD__, '1.18' );
 277                 } else {
 278                         $this->setContext( $context );
 279                 }
 280         }
 281
 282         /**
 283          * Redirect to $url rather than displaying the normal page
 284          *
 285          * @param string $url URL
 286          * @param string $responsecode HTTP status code
 287          */
 288         public function redirect( $url, $responsecode = '302' ) {
 289                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 290                 $this->mRedirect = str_replace( "\n", '', $url );
 291                 $this->mRedirectCode = $responsecode;
 292         }
 293
 294         /**
 295          * Get the URL to redirect to, or an empty string if not redirect URL set
 296          *
 297          * @return String
 298          */
 299         public function getRedirect() {
 300                 return $this->mRedirect;
 301         }
 302
 303         /**
 304          * Set the HTTP status code to send with the output.
 305          *
 306          * @param $statusCode Integer
 307          */
 308         public function setStatusCode( $statusCode ) {
 309                 $this->mStatusCode = $statusCode;
 310         }
 311
 312         /**
 313          * Add a new "<meta>" tag
 314          * To add an http-equiv meta tag, precede the name with "http:"
 315          *
 316          * @param string $name tag name
 317          * @param string $val tag value
 318          */
 319         function addMeta( $name, $val ) {
 320                 array_push( $this->mMetatags, array( $name, $val ) );
 321         }
 322
 323         /**
 324          * Add a new \<link\> tag to the page header.
 325          *
 326          * Note: use setCanonicalUrl() for rel=canonical.
 327          *
 328          * @param array $linkarr associative array of attributes.
 329          */
 330         function addLink( $linkarr ) {
 331                 array_push( $this->mLinktags, $linkarr );
 332         }
 333
 334         /**
 335          * Add a new \<link\> with "rel" attribute set to "meta"
 336          *
 337          * @param array $linkarr associative array mapping attribute names to their
 338          *                 values, both keys and values will be escaped, and the
 339          *                 "rel" attribute will be automatically added
 340          */
 341         function addMetadataLink( $linkarr ) {
 342                 $linkarr['rel'] = $this->getMetadataAttribute();
 343                 $this->addLink( $linkarr );
 344         }
 345
 346         /**
 347          * Set the URL to be used for the <link rel=canonical>. This should be used
 348          * in preference to addLink(), to avoid duplicate link tags.
 349          */
 350         function setCanonicalUrl( $url ) {
 351                 $this->mCanonicalUrl = $url;
 352         }
 353
 354         /**
 355          * Get the value of the "rel" attribute for metadata links
 356          *
 357          * @return String
 358          */
 359         public function getMetadataAttribute() {
 360                 # note: buggy CC software only reads first "meta" link
 361                 static $haveMeta = false;
 362                 if ( $haveMeta ) {
 363                         return 'alternate meta';
 364                 } else {
 365                         $haveMeta = true;
 366                         return 'meta';
 367                 }
 368         }
 369
 370         /**
 371          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 372          *
 373          * @param string $script raw HTML
 374          */
 375         function addScript( $script ) {
 376                 $this->mScripts .= $script . "\n";
 377         }
 378
 379         /**
 380          * Register and add a stylesheet from an extension directory.
 381          *
 382          * @param string $url path to sheet.  Provide either a full url (beginning
 383          *             with 'http', etc) or a relative path from the document root
 384          *             (beginning with '/').  Otherwise it behaves identically to
 385          *             addStyle() and draws from the /skins folder.
 386          */
 387         public function addExtensionStyle( $url ) {
 388                 array_push( $this->mExtStyles, $url );
 389         }
 390
 391         /**
 392          * Get all styles added by extensions
 393          *
 394          * @return Array
 395          */
 396         function getExtStyle() {
 397                 return $this->mExtStyles;
 398         }
 399
 400         /**
 401          * Add a JavaScript file out of skins/common, or a given relative path.
 402          *
 403          * @param string $file filename in skins/common or complete on-server path
 404          *              (/foo/bar.js)
 405          * @param string $version style version of the file. Defaults to $wgStyleVersion
 406          */
 407         public function addScriptFile( $file, $version = null ) {
 408                 global $wgStylePath, $wgStyleVersion;
 409                 // See if $file parameter is an absolute URL or begins with a slash
 410                 if ( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 411                         $path = $file;
 412                 } else {
 413                         $path = "{$wgStylePath}/common/{$file}";
 414                 }
 415                 if ( is_null( $version ) ) {
 416                         $version = $wgStyleVersion;
 417                 }
 418                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 419         }
 420
 421         /**
 422          * Add a self-contained script tag with the given contents
 423          *
 424          * @param string $script JavaScript text, no "<script>" tags
 425          */
 426         public function addInlineScript( $script ) {
 427                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 428         }
 429
 430         /**
 431          * Get all registered JS and CSS tags for the header.
 432          *
 433          * @return String
 434          */
 435         function getScript() {
 436                 return $this->mScripts . $this->getHeadItems();
 437         }
 438
 439         /**
 440          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 441          * which are no longer registered (eg a page is cached before an extension is disabled)
 442          * @param $modules Array
 443          * @param string $position if not null, only return modules with this position
 444          * @param $type string
 445          * @return Array
 446          */
 447         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ) {
 448                 $resourceLoader = $this->getResourceLoader();
 449                 $filteredModules = array();
 450                 foreach ( $modules as $val ) {
 451                         $module = $resourceLoader->getModule( $val );
 452                         if ( $module instanceof ResourceLoaderModule
 453                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 454                                 && ( is_null( $position ) || $module->getPosition() == $position )
 455                                 && ( !$this->mTarget || in_array( $this->mTarget, $module->getTargets() ) ) )
 456                         {
 457                                 $filteredModules[] = $val;
 458                         }
 459                 }
 460                 return $filteredModules;
 461         }
 462
 463         /**
 464          * Get the list of modules to include on this page
 465          *
 466          * @param bool $filter whether to filter out insufficiently trustworthy modules
 467          * @param string $position if not null, only return modules with this position
 468          * @param $param string
 469          * @return Array of module names
 470          */
 471         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 472                 $modules = array_values( array_unique( $this->$param ) );
 473                 return $filter
 474                         ? $this->filterModules( $modules, $position )
 475                         : $modules;
 476         }
 477
 478         /**
 479          * Add one or more modules recognized by the resource loader. Modules added
 480          * through this function will be loaded by the resource loader when the
 481          * page loads.
 482          *
 483          * @param $modules Mixed: module name (string) or array of module names
 484          */
 485         public function addModules( $modules ) {
 486                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 487         }
 488
 489         /**
 490          * Get the list of module JS to include on this page
 491          *
 492          * @param $filter
 493          * @param $position
 494          *
 495          * @return array of module names
 496          */
 497         public function getModuleScripts( $filter = false, $position = null ) {
 498                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 499         }
 500
 501         /**
 502          * Add only JS of one or more modules recognized by the resource loader. Module
 503          * scripts added through this function will be loaded by the resource loader when
 504          * the page loads.
 505          *
 506          * @param $modules Mixed: module name (string) or array of module names
 507          */
 508         public function addModuleScripts( $modules ) {
 509                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 510         }
 511
 512         /**
 513          * Get the list of module CSS to include on this page
 514          *
 515          * @param $filter
 516          * @param $position
 517          *
 518          * @return Array of module names
 519          */
 520         public function getModuleStyles( $filter = false, $position = null ) {
 521                 return $this->getModules( $filter, $position, 'mModuleStyles' );
 522         }
 523
 524         /**
 525          * Add only CSS of one or more modules recognized by the resource loader.
 526          *
 527          * Module styles added through this function will be added using standard link CSS
 528          * tags, rather than as a combined Javascript and CSS package. Thus, they will
 529          * load when JavaScript is disabled (unless CSS also happens to be disabled).
 530          *
 531          * @param $modules Mixed: module name (string) or array of module names
 532          */
 533         public function addModuleStyles( $modules ) {
 534                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 535         }
 536
 537         /**
 538          * Get the list of module messages to include on this page
 539          *
 540          * @param $filter
 541          * @param $position
 542          *
 543          * @return Array of module names
 544          */
 545         public function getModuleMessages( $filter = false, $position = null ) {
 546                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 547         }
 548
 549         /**
 550          * Add only messages of one or more modules recognized by the resource loader.
 551          * Module messages added through this function will be loaded by the resource
 552          * loader when the page loads.
 553          *
 554          * @param $modules Mixed: module name (string) or array of module names
 555          */
 556         public function addModuleMessages( $modules ) {
 557                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 558         }
 559
 560         /**
 561          * @return null|string: ResourceLoader target
 562          */
 563         public function getTarget() {
 564                 return $this->mTarget;
 565         }
 566
 567         /**
 568          * Sets ResourceLoader target for load.php links. If null, will be omitted
 569          *
 570          * @param $target string|null
 571          */
 572         public function setTarget( $target ) {
 573                 $this->mTarget = $target;
 574         }
 575
 576         /**
 577          * Get an array of head items
 578          *
 579          * @return Array
 580          */
 581         function getHeadItemsArray() {
 582                 return $this->mHeadItems;
 583         }
 584
 585         /**
 586          * Get all header items in a string
 587          *
 588          * @return String
 589          */
 590         function getHeadItems() {
 591                 $s = '';
 592                 foreach ( $this->mHeadItems as $item ) {
 593                         $s .= $item;
 594                 }
 595                 return $s;
 596         }
 597
 598         /**
 599          * Add or replace an header item to the output
 600          *
 601          * @param string $name item name
 602          * @param string $value raw HTML
 603          */
 604         public function addHeadItem( $name, $value ) {
 605                 $this->mHeadItems[$name] = $value;
 606         }
 607
 608         /**
 609          * Check if the header item $name is already set
 610          *
 611          * @param string $name item name
 612          * @return Boolean
 613          */
 614         public function hasHeadItem( $name ) {
 615                 return isset( $this->mHeadItems[$name] );
 616         }
 617
 618         /**
 619          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 620          *
 621          * @param string $tag value of "ETag" header
 622          */
 623         function setETag( $tag ) {
 624                 $this->mETag = $tag;
 625         }
 626
 627         /**
 628          * Set whether the output should only contain the body of the article,
 629          * without any skin, sidebar, etc.
 630          * Used e.g. when calling with "action=render".
 631          *
 632          * @param $only Boolean: whether to output only the body of the article
 633          */
 634         public function setArticleBodyOnly( $only ) {
 635                 $this->mArticleBodyOnly = $only;
 636         }
 637
 638         /**
 639          * Return whether the output will contain only the body of the article
 640          *
 641          * @return Boolean
 642          */
 643         public function getArticleBodyOnly() {
 644                 return $this->mArticleBodyOnly;
 645         }
 646
 647         /**
 648          * Set an additional output property
 649          * @since 1.21
 650          *
 651          * @param string $name
 652          * @param mixed $value
 653          */
 654         public function setProperty( $name, $value ) {
 655                 $this->mProperties[$name] = $value;
 656         }
 657
 658         /**
 659          * Get an additional output property
 660          * @since 1.21
 661          *
 662          * @param $name
 663          * @return mixed: Property value or null if not found
 664          */
 665         public function getProperty( $name ) {
 666                 if ( isset( $this->mProperties[$name] ) ) {
 667                         return $this->mProperties[$name];
 668                 } else {
 669                         return null;
 670                 }
 671         }
 672
 673         /**
 674          * checkLastModified tells the client to use the client-cached page if
 675          * possible. If successful, the OutputPage is disabled so that
 676          * any future call to OutputPage->output() have no effect.
 677          *
 678          * Side effect: sets mLastModified for Last-Modified header
 679          *
 680          * @param $timestamp string
 681          *
 682          * @return Boolean: true if cache-ok headers was sent.
 683          */
 684         public function checkLastModified( $timestamp ) {
 685                 global $wgCachePages, $wgCacheEpoch, $wgUseSquid, $wgSquidMaxage;
 686
 687                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 688                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 689                         return false;
 690                 }
 691                 if ( !$wgCachePages ) {
 692                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 693                         return false;
 694                 }
 695                 if ( $this->getUser()->getOption( 'nocache' ) ) {
 696                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 697                         return false;
 698                 }
 699
 700                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 701                 $modifiedTimes = array(
 702                         'page' => $timestamp,
 703                         'user' => $this->getUser()->getTouched(),
 704                         'epoch' => $wgCacheEpoch
 705                 );
 706                 if ( $wgUseSquid ) {
 707                         // bug 44570: the core page itself may not change, but resources might
 708                         $modifiedTimes['sepoch'] = wfTimestamp( TS_MW, time() - $wgSquidMaxage );
 709                 }
 710                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 711
 712                 $maxModified = max( $modifiedTimes );
 713                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 714
 715                 $clientHeader = $this->getRequest()->getHeader( 'If-Modified-Since' );
 716                 if ( $clientHeader === false ) {
 717                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 718                         return false;
 719                 }
 720
 721                 # IE sends sizes after the date like this:
 722                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 723                 # this breaks strtotime().
 724                 $clientHeader = preg_replace( '/;.*$/', '', $clientHeader );
 725
 726                 wfSuppressWarnings(); // E_STRICT system time bitching
 727                 $clientHeaderTime = strtotime( $clientHeader );
 728                 wfRestoreWarnings();
 729                 if ( !$clientHeaderTime ) {
 730                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 731                         return false;
 732                 }
 733                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 734
 735                 # Make debug info
 736                 $info = '';
 737                 foreach ( $modifiedTimes as $name => $value ) {
 738                         if ( $info !== '' ) {
 739                                 $info .= ', ';
 740                         }
 741                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 742                 }
 743
 744                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 745                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 746                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 747                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 748                 if ( $clientHeaderTime < $maxModified ) {
 749                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 750                         return false;
 751                 }
 752
 753                 # Not modified
 754                 # Give a 304 response code and disable body output
 755                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 756                 ini_set( 'zlib.output_compression', 0 );
 757                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 758                 $this->sendCacheControl();
 759                 $this->disable();
 760
 761                 // Don't output a compressed blob when using ob_gzhandler;
 762                 // it's technically against HTTP spec and seems to confuse
 763                 // Firefox when the response gets split over two packets.
 764                 wfClearOutputBuffers();
 765
 766                 return true;
 767         }
 768
 769         /**
 770          * Override the last modified timestamp
 771          *
 772          * @param string $timestamp new timestamp, in a format readable by
 773          *        wfTimestamp()
 774          */
 775         public function setLastModified( $timestamp ) {
 776                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 777         }
 778
 779         /**
 780          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 781          *
 782          * @param string $policy the literal string to output as the contents of
 783          *   the meta tag.  Will be parsed according to the spec and output in
 784          *   standardized form.
 785          * @return null
 786          */
 787         public function setRobotPolicy( $policy ) {
 788                 $policy = Article::formatRobotPolicy( $policy );
 789
 790                 if ( isset( $policy['index'] ) ) {
 791                         $this->setIndexPolicy( $policy['index'] );
 792                 }
 793                 if ( isset( $policy['follow'] ) ) {
 794                         $this->setFollowPolicy( $policy['follow'] );
 795                 }
 796         }
 797
 798         /**
 799          * Set the index policy for the page, but leave the follow policy un-
 800          * touched.
 801          *
 802          * @param string $policy Either 'index' or 'noindex'.
 803          * @return null
 804          */
 805         public function setIndexPolicy( $policy ) {
 806                 $policy = trim( $policy );
 807                 if ( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 808                         $this->mIndexPolicy = $policy;
 809                 }
 810         }
 811
 812         /**
 813          * Set the follow policy for the page, but leave the index policy un-
 814          * touched.
 815          *
 816          * @param string $policy either 'follow' or 'nofollow'.
 817          * @return null
 818          */
 819         public function setFollowPolicy( $policy ) {
 820                 $policy = trim( $policy );
 821                 if ( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 822                         $this->mFollowPolicy = $policy;
 823                 }
 824         }
 825
 826         /**
 827          * Set the new value of the "action text", this will be added to the
 828          * "HTML title", separated from it with " - ".
 829          *
 830          * @param string $text new value of the "action text"
 831          */
 832         public function setPageTitleActionText( $text ) {
 833                 $this->mPageTitleActionText = $text;
 834         }
 835
 836         /**
 837          * Get the value of the "action text"
 838          *
 839          * @return String
 840          */
 841         public function getPageTitleActionText() {
 842                 if ( isset( $this->mPageTitleActionText ) ) {
 843                         return $this->mPageTitleActionText;
 844                 }
 845                 return '';
 846         }
 847
 848         /**
 849          * "HTML title" means the contents of "<title>".
 850          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 851          *
 852          * @param $name string
 853          */
 854         public function setHTMLTitle( $name ) {
 855                 if ( $name instanceof Message ) {
 856                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 857                 } else {
 858                         $this->mHTMLtitle = $name;
 859                 }
 860         }
 861
 862         /**
 863          * Return the "HTML title", i.e. the content of the "<title>" tag.
 864          *
 865          * @return String
 866          */
 867         public function getHTMLTitle() {
 868                 return $this->mHTMLtitle;
 869         }
 870
 871         /**
 872          * Set $mRedirectedFrom, the Title of the page which redirected us to the current page.
 873          *
 874          * @param $t Title
 875          */
 876         public function setRedirectedFrom( $t ) {
 877                 $this->mRedirectedFrom = $t;
 878         }
 879
 880         /**
 881          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 882          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 883          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 884          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 885          *
 886          * @param $name string|Message
 887          */
 888         public function setPageTitle( $name ) {
 889                 if ( $name instanceof Message ) {
 890                         $name = $name->setContext( $this->getContext() )->text();
 891                 }
 892
 893                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 894                 # but leave "<i>foobar</i>" alone
 895                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 896                 $this->mPagetitle = $nameWithTags;
 897
 898                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 899                 $this->setHTMLTitle( $this->msg( 'pagetitle' )->rawParams( Sanitizer::stripAllTags( $nameWithTags ) ) );
 900         }
 901
 902         /**
 903          * Return the "page title", i.e. the content of the \<h1\> tag.
 904          *
 905          * @return String
 906          */
 907         public function getPageTitle() {
 908                 return $this->mPagetitle;
 909         }
 910
 911         /**
 912          * Set the Title object to use
 913          *
 914          * @param $t Title object
 915          */
 916         public function setTitle( Title $t ) {
 917                 $this->getContext()->setTitle( $t );
 918         }
 919
 920         /**
 921          * Replace the subtitle with $str
 922          *
 923          * @param string|Message $str new value of the subtitle. String should be safe HTML.
 924          */
 925         public function setSubtitle( $str ) {
 926                 $this->clearSubtitle();
 927                 $this->addSubtitle( $str );
 928         }
 929
 930         /**
 931          * Add $str to the subtitle
 932          *
 933          * @deprecated in 1.19; use addSubtitle() instead
 934          * @param string|Message $str to add to the subtitle
 935          */
 936         public function appendSubtitle( $str ) {
 937                 $this->addSubtitle( $str );
 938         }
 939
 940         /**
 941          * Add $str to the subtitle
 942          *
 943          * @param string|Message $str to add to the subtitle. String should be safe HTML.
 944          */
 945         public function addSubtitle( $str ) {
 946                 if ( $str instanceof Message ) {
 947                         $this->mSubtitle[] = $str->setContext( $this->getContext() )->parse();
 948                 } else {
 949                         $this->mSubtitle[] = $str;
 950                 }
 951         }
 952
 953         /**
 954          * Add a subtitle containing a backlink to a page
 955          *
 956          * @param $title Title to link to
 957          */
 958         public function addBacklinkSubtitle( Title $title ) {
 959                 $query = array();
 960                 if ( $title->isRedirect() ) {
 961                         $query['redirect'] = 'no';
 962                 }
 963                 $this->addSubtitle( $this->msg( 'backlinksubtitle' )->rawParams( Linker::link( $title, null, array(), $query ) ) );
 964         }
 965
 966         /**
 967          * Clear the subtitles
 968          */
 969         public function clearSubtitle() {
 970                 $this->mSubtitle = array();
 971         }
 972
 973         /**
 974          * Get the subtitle
 975          *
 976          * @return String
 977          */
 978         public function getSubtitle() {
 979                 return implode( "<br />\n\t\t\t\t", $this->mSubtitle );
 980         }
 981
 982         /**
 983          * Set the page as printable, i.e. it'll be displayed with with all
 984          * print styles included
 985          */
 986         public function setPrintable() {
 987                 $this->mPrintable = true;
 988         }
 989
 990         /**
 991          * Return whether the page is "printable"
 992          *
 993          * @return Boolean
 994          */
 995         public function isPrintable() {
 996                 return $this->mPrintable;
 997         }
 998
 999         /**
1000          * Disable output completely, i.e. calling output() will have no effect
1001          */
1002         public function disable() {
1003                 $this->mDoNothing = true;
1004         }
1005
1006         /**
1007          * Return whether the output will be completely disabled
1008          *
1009          * @return Boolean
1010          */
1011         public function isDisabled() {
1012                 return $this->mDoNothing;
1013         }
1014
1015         /**
1016          * Show an "add new section" link?
1017          *
1018          * @return Boolean
1019          */
1020         public function showNewSectionLink() {
1021                 return $this->mNewSectionLink;
1022         }
1023
1024         /**
1025          * Forcibly hide the new section link?
1026          *
1027          * @return Boolean
1028          */
1029         public function forceHideNewSectionLink() {
1030                 return $this->mHideNewSectionLink;
1031         }
1032
1033         /**
1034          * Add or remove feed links in the page header
1035          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1036          * for the new version
1037          * @see addFeedLink()
1038          *
1039          * @param $show Boolean: true: add default feeds, false: remove all feeds
1040          */
1041         public function setSyndicated( $show = true ) {
1042                 if ( $show ) {
1043                         $this->setFeedAppendQuery( false );
1044                 } else {
1045                         $this->mFeedLinks = array();
1046                 }
1047         }
1048
1049         /**
1050          * Add default feeds to the page header
1051          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
1052          * for the new version
1053          * @see addFeedLink()
1054          *
1055          * @param string $val query to append to feed links or false to output
1056          *        default links
1057          */
1058         public function setFeedAppendQuery( $val ) {
1059                 global $wgAdvertisedFeedTypes;
1060
1061                 $this->mFeedLinks = array();
1062
1063                 foreach ( $wgAdvertisedFeedTypes as $type ) {
1064                         $query = "feed=$type";
1065                         if ( is_string( $val ) ) {
1066                                 $query .= '&' . $val;
1067                         }
1068                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
1069                 }
1070         }
1071
1072         /**
1073          * Add a feed link to the page header
1074          *
1075          * @param string $format feed type, should be a key of $wgFeedClasses
1076          * @param string $href URL
1077          */
1078         public function addFeedLink( $format, $href ) {
1079                 global $wgAdvertisedFeedTypes;
1080
1081                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
1082                         $this->mFeedLinks[$format] = $href;
1083                 }
1084         }
1085
1086         /**
1087          * Should we output feed links for this page?
1088          * @return Boolean
1089          */
1090         public function isSyndicated() {
1091                 return count( $this->mFeedLinks ) > 0;
1092         }
1093
1094         /**
1095          * Return URLs for each supported syndication format for this page.
1096          * @return array associating format keys with URLs
1097          */
1098         public function getSyndicationLinks() {
1099                 return $this->mFeedLinks;
1100         }
1101
1102         /**
1103          * Will currently always return null
1104          *
1105          * @return null
1106          */
1107         public function getFeedAppendQuery() {
1108                 return $this->mFeedLinksAppendQuery;
1109         }
1110
1111         /**
1112          * Set whether the displayed content is related to the source of the
1113          * corresponding article on the wiki
1114          * Setting true will cause the change "article related" toggle to true
1115          *
1116          * @param $v Boolean
1117          */
1118         public function setArticleFlag( $v ) {
1119                 $this->mIsarticle = $v;
1120                 if ( $v ) {
1121                         $this->mIsArticleRelated = $v;
1122                 }
1123         }
1124
1125         /**
1126          * Return whether the content displayed page is related to the source of
1127          * the corresponding article on the wiki
1128          *
1129          * @return Boolean
1130          */
1131         public function isArticle() {
1132                 return $this->mIsarticle;
1133         }
1134
1135         /**
1136          * Set whether this page is related an article on the wiki
1137          * Setting false will cause the change of "article flag" toggle to false
1138          *
1139          * @param $v Boolean
1140          */
1141         public function setArticleRelated( $v ) {
1142                 $this->mIsArticleRelated = $v;
1143                 if ( !$v ) {
1144                         $this->mIsarticle = false;
1145                 }
1146         }
1147
1148         /**
1149          * Return whether this page is related an article on the wiki
1150          *
1151          * @return Boolean
1152          */
1153         public function isArticleRelated() {
1154                 return $this->mIsArticleRelated;
1155         }
1156
1157         /**
1158          * Add new language links
1159          *
1160          * @param array $newLinkArray Associative array mapping language code to the page
1161          *                      name
1162          */
1163         public function addLanguageLinks( $newLinkArray ) {
1164                 $this->mLanguageLinks += $newLinkArray;
1165         }
1166
1167         /**
1168          * Reset the language links and add new language links
1169          *
1170          * @param array $newLinkArray Associative array mapping language code to the page
1171          *                      name
1172          */
1173         public function setLanguageLinks( $newLinkArray ) {
1174                 $this->mLanguageLinks = $newLinkArray;
1175         }
1176
1177         /**
1178          * Get the list of language links
1179          *
1180          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1181          */
1182         public function getLanguageLinks() {
1183                 return $this->mLanguageLinks;
1184         }
1185
1186         /**
1187          * Add an array of categories, with names in the keys
1188          *
1189          * @param array $categories mapping category name => sort key
1190          */
1191         public function addCategoryLinks( $categories ) {
1192                 global $wgContLang;
1193
1194                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1195                         return;
1196                 }
1197
1198                 # Add the links to a LinkBatch
1199                 $arr = array( NS_CATEGORY => $categories );
1200                 $lb = new LinkBatch;
1201                 $lb->setArray( $arr );
1202
1203                 # Fetch existence plus the hiddencat property
1204                 $dbr = wfGetDB( DB_SLAVE );
1205                 $res = $dbr->select( array( 'page', 'page_props' ),
1206                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1207                         $lb->constructSet( 'page', $dbr ),
1208                         __METHOD__,
1209                         array(),
1210                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1211                 );
1212
1213                 # Add the results to the link cache
1214                 $lb->addResultToCache( LinkCache::singleton(), $res );
1215
1216                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1217                 $categories = array_combine(
1218                         array_keys( $categories ),
1219                         array_fill( 0, count( $categories ), 'normal' )
1220                 );
1221
1222                 # Mark hidden categories
1223                 foreach ( $res as $row ) {
1224                         if ( isset( $row->pp_value ) ) {
1225                                 $categories[$row->page_title] = 'hidden';
1226                         }
1227                 }
1228
1229                 # Add the remaining categories to the skin
1230                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1231                         foreach ( $categories as $category => $type ) {
1232                                 $origcategory = $category;
1233                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1234                                 $wgContLang->findVariantLink( $category, $title, true );
1235                                 if ( $category != $origcategory ) {
1236                                         if ( array_key_exists( $category, $categories ) ) {
1237                                                 continue;
1238                                         }
1239                                 }
1240                                 $text = $wgContLang->convertHtml( $title->getText() );
1241                                 $this->mCategories[] = $title->getText();
1242                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1243                         }
1244                 }
1245         }
1246
1247         /**
1248          * Reset the category links (but not the category list) and add $categories
1249          *
1250          * @param array $categories mapping category name => sort key
1251          */
1252         public function setCategoryLinks( $categories ) {
1253                 $this->mCategoryLinks = array();
1254                 $this->addCategoryLinks( $categories );
1255         }
1256
1257         /**
1258          * Get the list of category links, in a 2-D array with the following format:
1259          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1260          * hidden categories) and $link a HTML fragment with a link to the category
1261          * page
1262          *
1263          * @return Array
1264          */
1265         public function getCategoryLinks() {
1266                 return $this->mCategoryLinks;
1267         }
1268
1269         /**
1270          * Get the list of category names this page belongs to
1271          *
1272          * @return Array of strings
1273          */
1274         public function getCategories() {
1275                 return $this->mCategories;
1276         }
1277
1278         /**
1279          * Do not allow scripts which can be modified by wiki users to load on this page;
1280          * only allow scripts bundled with, or generated by, the software.
1281          */
1282         public function disallowUserJs() {
1283                 $this->reduceAllowedModules(
1284                         ResourceLoaderModule::TYPE_SCRIPTS,
1285                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1286                 );
1287         }
1288
1289         /**
1290          * Return whether user JavaScript is allowed for this page
1291          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1292          *     trustworthiness is identified and enforced automagically.
1293          * @return Boolean
1294          */
1295         public function isUserJsAllowed() {
1296                 wfDeprecated( __METHOD__, '1.18' );
1297                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1298         }
1299
1300         /**
1301          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1302          * @see ResourceLoaderModule::$origin
1303          * @param string $type ResourceLoaderModule TYPE_ constant
1304          * @return Int ResourceLoaderModule ORIGIN_ class constant
1305          */
1306         public function getAllowedModules( $type ) {
1307                 if ( $type == ResourceLoaderModule::TYPE_COMBINED ) {
1308                         return min( array_values( $this->mAllowedModules ) );
1309                 } else {
1310                         return isset( $this->mAllowedModules[$type] )
1311                                 ? $this->mAllowedModules[$type]
1312                                 : ResourceLoaderModule::ORIGIN_ALL;
1313                 }
1314         }
1315
1316         /**
1317          * Set the highest level of CSS/JS untrustworthiness allowed
1318          * @param  $type String ResourceLoaderModule TYPE_ constant
1319          * @param  $level Int ResourceLoaderModule class constant
1320          */
1321         public function setAllowedModules( $type, $level ) {
1322                 $this->mAllowedModules[$type] = $level;
1323         }
1324
1325         /**
1326          * As for setAllowedModules(), but don't inadvertently make the page more accessible
1327          * @param  $type String
1328          * @param  $level Int ResourceLoaderModule class constant
1329          */
1330         public function reduceAllowedModules( $type, $level ) {
1331                 $this->mAllowedModules[$type] = min( $this->getAllowedModules( $type ), $level );
1332         }
1333
1334         /**
1335          * Prepend $text to the body HTML
1336          *
1337          * @param string $text HTML
1338          */
1339         public function prependHTML( $text ) {
1340                 $this->mBodytext = $text . $this->mBodytext;
1341         }
1342
1343         /**
1344          * Append $text to the body HTML
1345          *
1346          * @param string $text HTML
1347          */
1348         public function addHTML( $text ) {
1349                 $this->mBodytext .= $text;
1350         }
1351
1352         /**
1353          * Shortcut for adding an Html::element via addHTML.
1354          *
1355          * @since 1.19
1356          *
1357          * @param $element string
1358          * @param $attribs array
1359          * @param $contents string
1360          */
1361         public function addElement( $element, $attribs = array(), $contents = '' ) {
1362                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1363         }
1364
1365         /**
1366          * Clear the body HTML
1367          */
1368         public function clearHTML() {
1369                 $this->mBodytext = '';
1370         }
1371
1372         /**
1373          * Get the body HTML
1374          *
1375          * @return String: HTML
1376          */
1377         public function getHTML() {
1378                 return $this->mBodytext;
1379         }
1380
1381         /**
1382          * Get/set the ParserOptions object to use for wikitext parsing
1383          *
1384          * @param $options ParserOptions|null either the ParserOption to use or null to only get the
1385          *                 current ParserOption object
1386          * @return ParserOptions object
1387          */
1388         public function parserOptions( $options = null ) {
1389                 if ( !$this->mParserOptions ) {
1390                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1391                         $this->mParserOptions->setEditSection( false );
1392                 }
1393                 return wfSetVar( $this->mParserOptions, $options );
1394         }
1395
1396         /**
1397          * Set the revision ID which will be seen by the wiki text parser
1398          * for things such as embedded {{REVISIONID}} variable use.
1399          *
1400          * @param $revid Mixed: an positive integer, or null
1401          * @return Mixed: previous value
1402          */
1403         public function setRevisionId( $revid ) {
1404                 $val = is_null( $revid ) ? null : intval( $revid );
1405                 return wfSetVar( $this->mRevisionId, $val );
1406         }
1407
1408         /**
1409          * Get the displayed revision ID
1410          *
1411          * @return Integer
1412          */
1413         public function getRevisionId() {
1414                 return $this->mRevisionId;
1415         }
1416
1417         /**
1418          * Set the timestamp of the revision which will be displayed. This is used
1419          * to avoid a extra DB call in Skin::lastModified().
1420          *
1421          * @param $timestamp Mixed: string, or null
1422          * @return Mixed: previous value
1423          */
1424         public function setRevisionTimestamp( $timestamp ) {
1425                 return wfSetVar( $this->mRevisionTimestamp, $timestamp );
1426         }
1427
1428         /**
1429          * Get the timestamp of displayed revision.
1430          * This will be null if not filled by setRevisionTimestamp().
1431          *
1432          * @return String or null
1433          */
1434         public function getRevisionTimestamp() {
1435                 return $this->mRevisionTimestamp;
1436         }
1437
1438         /**
1439          * Set the displayed file version
1440          *
1441          * @param $file File|bool
1442          * @return Mixed: previous value
1443          */
1444         public function setFileVersion( $file ) {
1445                 $val = null;
1446                 if ( $file instanceof File && $file->exists() ) {
1447                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1448                 }
1449                 return wfSetVar( $this->mFileVersion, $val, true );
1450         }
1451
1452         /**
1453          * Get the displayed file version
1454          *
1455          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1456          */
1457         public function getFileVersion() {
1458                 return $this->mFileVersion;
1459         }
1460
1461         /**
1462          * Get the templates used on this page
1463          *
1464          * @return Array (namespace => dbKey => revId)
1465          * @since 1.18
1466          */
1467         public function getTemplateIds() {
1468                 return $this->mTemplateIds;
1469         }
1470
1471         /**
1472          * Get the files used on this page
1473          *
1474          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1475          * @since 1.18
1476          */
1477         public function getFileSearchOptions() {
1478                 return $this->mImageTimeKeys;
1479         }
1480
1481         /**
1482          * Convert wikitext to HTML and add it to the buffer
1483          * Default assumes that the current page title will be used.
1484          *
1485          * @param $text String
1486          * @param $linestart Boolean: is this the start of a line?
1487          * @param $interface Boolean: is this text in the user interface language?
1488          */
1489         public function addWikiText( $text, $linestart = true, $interface = true ) {
1490                 $title = $this->getTitle(); // Work around E_STRICT
1491                 if ( !$title ) {
1492                         throw new MWException( 'Title is null' );
1493                 }
1494                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1495         }
1496
1497         /**
1498          * Add wikitext with a custom Title object
1499          *
1500          * @param string $text wikitext
1501          * @param $title Title object
1502          * @param $linestart Boolean: is this the start of a line?
1503          */
1504         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1505                 $this->addWikiTextTitle( $text, $title, $linestart );
1506         }
1507
1508         /**
1509          * Add wikitext with a custom Title object and tidy enabled.
1510          *
1511          * @param string $text wikitext
1512          * @param $title Title object
1513          * @param $linestart Boolean: is this the start of a line?
1514          */
1515         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1516                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1517         }
1518
1519         /**
1520          * Add wikitext with tidy enabled
1521          *
1522          * @param string $text wikitext
1523          * @param $linestart Boolean: is this the start of a line?
1524          */
1525         public function addWikiTextTidy( $text, $linestart = true ) {
1526                 $title = $this->getTitle();
1527                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1528         }
1529
1530         /**
1531          * Add wikitext with a custom Title object
1532          *
1533          * @param string $text wikitext
1534          * @param $title Title object
1535          * @param $linestart Boolean: is this the start of a line?
1536          * @param $tidy Boolean: whether to use tidy
1537          * @param $interface Boolean: whether it is an interface message
1538          *                                                              (for example disables conversion)
1539          */
1540         public function addWikiTextTitle( $text, Title $title, $linestart, $tidy = false, $interface = false ) {
1541                 global $wgParser;
1542
1543                 wfProfileIn( __METHOD__ );
1544
1545                 $popts = $this->parserOptions();
1546                 $oldTidy = $popts->setTidy( $tidy );
1547                 $popts->setInterfaceMessage( (bool)$interface );
1548
1549                 $parserOutput = $wgParser->parse(
1550                         $text, $title, $popts,
1551                         $linestart, true, $this->mRevisionId
1552                 );
1553
1554                 $popts->setTidy( $oldTidy );
1555
1556                 $this->addParserOutput( $parserOutput );
1557
1558                 wfProfileOut( __METHOD__ );
1559         }
1560
1561         /**
1562          * Add a ParserOutput object, but without Html
1563          *
1564          * @param $parserOutput ParserOutput object
1565          */
1566         public function addParserOutputNoText( &$parserOutput ) {
1567                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1568                 $this->addCategoryLinks( $parserOutput->getCategories() );
1569                 $this->mNewSectionLink = $parserOutput->getNewSection();
1570                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1571
1572                 $this->mParseWarnings = $parserOutput->getWarnings();
1573                 if ( !$parserOutput->isCacheable() ) {
1574                         $this->enableClientCache( false );
1575                 }
1576                 $this->mNoGallery = $parserOutput->getNoGallery();
1577                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1578                 $this->addModules( $parserOutput->getModules() );
1579                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1580                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1581                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1582
1583                 // Template versioning...
1584                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1585                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1586                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1587                         } else {
1588                                 $this->mTemplateIds[$ns] = $dbks;
1589                         }
1590                 }
1591                 // File versioning...
1592                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1593                         $this->mImageTimeKeys[$dbk] = $data;
1594                 }
1595
1596                 // Hooks registered in the object
1597                 global $wgParserOutputHooks;
1598                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1599                         list( $hookName, $data ) = $hookInfo;
1600                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1601                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1602                         }
1603                 }
1604
1605                 // Link flags are ignored for now, but may in the future be
1606                 // used to mark individual language links.
1607                 $linkFlags = array();
1608                 wfRunHooks( 'LanguageLinks', array( $this->getTitle(), &$this->mLanguageLinks, &$linkFlags ) );
1609                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1610         }
1611
1612         /**
1613          * Add a ParserOutput object
1614          *
1615          * @param $parserOutput ParserOutput
1616          */
1617         function addParserOutput( &$parserOutput ) {
1618                 $this->addParserOutputNoText( $parserOutput );
1619                 $parserOutput->setTOCEnabled( $this->mEnableTOC );
1620                 $parserOutput->setEditSectionTokens( $this->mEnableSectionEditLinks );
1621                 $text = $parserOutput->getText();
1622                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1623                 $this->addHTML( $text );
1624         }
1625
1626         /**
1627          * Add the output of a QuickTemplate to the output buffer
1628          *
1629          * @param $template QuickTemplate
1630          */
1631         public function addTemplate( &$template ) {
1632                 ob_start();
1633                 $template->execute();
1634                 $this->addHTML( ob_get_contents() );
1635                 ob_end_clean();
1636         }
1637
1638         /**
1639          * Parse wikitext and return the HTML.
1640          *
1641          * @param $text String
1642          * @param $linestart Boolean: is this the start of a line?
1643          * @param $interface Boolean: use interface language ($wgLang instead of
1644          *                   $wgContLang) while parsing language sensitive magic
1645          *                   words like GRAMMAR and PLURAL. This also disables
1646          *                   LanguageConverter.
1647          * @param $language  Language object: target language object, will override
1648          *                   $interface
1649          * @throws MWException
1650          * @return String: HTML
1651          */
1652         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1653                 global $wgParser;
1654
1655                 if ( is_null( $this->getTitle() ) ) {
1656                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1657                 }
1658
1659                 $popts = $this->parserOptions();
1660                 if ( $interface ) {
1661                         $popts->setInterfaceMessage( true );
1662                 }
1663                 if ( $language !== null ) {
1664                         $oldLang = $popts->setTargetLanguage( $language );
1665                 }
1666
1667                 $parserOutput = $wgParser->parse(
1668                         $text, $this->getTitle(), $popts,
1669                         $linestart, true, $this->mRevisionId
1670                 );
1671
1672                 if ( $interface ) {
1673                         $popts->setInterfaceMessage( false );
1674                 }
1675                 if ( $language !== null ) {
1676                         $popts->setTargetLanguage( $oldLang );
1677                 }
1678
1679                 return $parserOutput->getText();
1680         }
1681
1682         /**
1683          * Parse wikitext, strip paragraphs, and return the HTML.
1684          *
1685          * @param $text String
1686          * @param $linestart Boolean: is this the start of a line?
1687          * @param $interface Boolean: use interface language ($wgLang instead of
1688          *                   $wgContLang) while parsing language sensitive magic
1689          *                   words like GRAMMAR and PLURAL
1690          * @return String: HTML
1691          */
1692         public function parseInline( $text, $linestart = true, $interface = false ) {
1693                 $parsed = $this->parse( $text, $linestart, $interface );
1694
1695                 $m = array();
1696                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1697                         $parsed = $m[1];
1698                 }
1699
1700                 return $parsed;
1701         }
1702
1703         /**
1704          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1705          *
1706          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1707          */
1708         public function setSquidMaxage( $maxage ) {
1709                 $this->mSquidMaxage = $maxage;
1710         }
1711
1712         /**
1713          * Use enableClientCache(false) to force it to send nocache headers
1714          *
1715          * @param $state bool
1716          *
1717          * @return bool
1718          */
1719         public function enableClientCache( $state ) {
1720                 return wfSetVar( $this->mEnableClientCache, $state );
1721         }
1722
1723         /**
1724          * Get the list of cookies that will influence on the cache
1725          *
1726          * @return Array
1727          */
1728         function getCacheVaryCookies() {
1729                 global $wgCookiePrefix, $wgCacheVaryCookies;
1730                 static $cookies;
1731                 if ( $cookies === null ) {
1732                         $cookies = array_merge(
1733                                 array(
1734                                         "{$wgCookiePrefix}Token",
1735                                         "{$wgCookiePrefix}LoggedOut",
1736                                         "forceHTTPS",
1737                                         session_name()
1738                                 ),
1739                                 $wgCacheVaryCookies
1740                         );
1741                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1742                 }
1743                 return $cookies;
1744         }
1745
1746         /**
1747          * Check if the request has a cache-varying cookie header
1748          * If it does, it's very important that we don't allow public caching
1749          *
1750          * @return Boolean
1751          */
1752         function haveCacheVaryCookies() {
1753                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1754                 if ( $cookieHeader === false ) {
1755                         return false;
1756                 }
1757                 $cvCookies = $this->getCacheVaryCookies();
1758                 foreach ( $cvCookies as $cookieName ) {
1759                         # Check for a simple string match, like the way squid does it
1760                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1761                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1762                                 return true;
1763                         }
1764                 }
1765                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1766                 return false;
1767         }
1768
1769         /**
1770          * Add an HTTP header that will influence on the cache
1771          *
1772          * @param string $header header name
1773          * @param $option Array|null
1774          * @todo FIXME: Document the $option parameter; it appears to be for
1775          *        X-Vary-Options but what format is acceptable?
1776          */
1777         public function addVaryHeader( $header, $option = null ) {
1778                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1779                         $this->mVaryHeader[$header] = (array)$option;
1780                 } elseif ( is_array( $option ) ) {
1781                         if ( is_array( $this->mVaryHeader[$header] ) ) {
1782                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1783                         } else {
1784                                 $this->mVaryHeader[$header] = $option;
1785                         }
1786                 }
1787                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1788         }
1789
1790         /**
1791          * Return a Vary: header on which to vary caches. Based on the keys of $mVaryHeader,
1792          * such as Accept-Encoding or Cookie
1793          *
1794          * @return String
1795          */
1796         public function getVaryHeader() {
1797                 return 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) );
1798         }
1799
1800         /**
1801          * Get a complete X-Vary-Options header
1802          *
1803          * @return String
1804          */
1805         public function getXVO() {
1806                 $cvCookies = $this->getCacheVaryCookies();
1807
1808                 $cookiesOption = array();
1809                 foreach ( $cvCookies as $cookieName ) {
1810                         $cookiesOption[] = 'string-contains=' . $cookieName;
1811                 }
1812                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1813
1814                 $headers = array();
1815                 foreach ( $this->mVaryHeader as $header => $option ) {
1816                         $newheader = $header;
1817                         if ( is_array( $option ) && count( $option ) > 0 ) {
1818                                 $newheader .= ';' . implode( ';', $option );
1819                         }
1820                         $headers[] = $newheader;
1821                 }
1822                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1823
1824                 return $xvo;
1825         }
1826
1827         /**
1828          * bug 21672: Add Accept-Language to Vary and XVO headers
1829          * if there's no 'variant' parameter existed in GET.
1830          *
1831          * For example:
1832          *   /w/index.php?title=Main_page should always be served; but
1833          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1834          */
1835         function addAcceptLanguage() {
1836                 $lang = $this->getTitle()->getPageLanguage();
1837                 if ( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1838                         $variants = $lang->getVariants();
1839                         $aloption = array();
1840                         foreach ( $variants as $variant ) {
1841                                 if ( $variant === $lang->getCode() ) {
1842                                         continue;
1843                                 } else {
1844                                         $aloption[] = 'string-contains=' . $variant;
1845
1846                                         // IE and some other browsers use BCP 47 standards in
1847                                         // their Accept-Language header, like "zh-CN" or "zh-Hant".
1848                                         // We should handle these too.
1849                                         $variantBCP47 = wfBCP47( $variant );
1850                                         if ( $variantBCP47 !== $variant ) {
1851                                                 $aloption[] = 'string-contains=' . $variantBCP47;
1852                                         }
1853                                 }
1854                         }
1855                         $this->addVaryHeader( 'Accept-Language', $aloption );
1856                 }
1857         }
1858
1859         /**
1860          * Set a flag which will cause an X-Frame-Options header appropriate for
1861          * edit pages to be sent. The header value is controlled by
1862          * $wgEditPageFrameOptions.
1863          *
1864          * This is the default for special pages. If you display a CSRF-protected
1865          * form on an ordinary view page, then you need to call this function.
1866          *
1867          * @param $enable bool
1868          */
1869         public function preventClickjacking( $enable = true ) {
1870                 $this->mPreventClickjacking = $enable;
1871         }
1872
1873         /**
1874          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1875          * This can be called from pages which do not contain any CSRF-protected
1876          * HTML form.
1877          */
1878         public function allowClickjacking() {
1879                 $this->mPreventClickjacking = false;
1880         }
1881
1882         /**
1883          * Get the X-Frame-Options header value (without the name part), or false
1884          * if there isn't one. This is used by Skin to determine whether to enable
1885          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1886          *
1887          * @return string
1888          */
1889         public function getFrameOptions() {
1890                 global $wgBreakFrames, $wgEditPageFrameOptions;
1891                 if ( $wgBreakFrames ) {
1892                         return 'DENY';
1893                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1894                         return $wgEditPageFrameOptions;
1895                 }
1896                 return false;
1897         }
1898
1899         /**
1900          * Send cache control HTTP headers
1901          */
1902         public function sendCacheControl() {
1903                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1904
1905                 $response = $this->getRequest()->response();
1906                 if ( $wgUseETag && $this->mETag ) {
1907                         $response->header( "ETag: $this->mETag" );
1908                 }
1909
1910                 $this->addVaryHeader( 'Cookie' );
1911                 $this->addAcceptLanguage();
1912
1913                 # don't serve compressed data to clients who can't handle it
1914                 # maintain different caches for logged-in users and non-logged in ones
1915                 $response->header( $this->getVaryHeader() );
1916
1917                 if ( $wgUseXVO ) {
1918                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1919                         $response->header( $this->getXVO() );
1920                 }
1921
1922                 if ( $this->mEnableClientCache ) {
1923                         if (
1924                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1925                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1926                         ) {
1927                                 if ( $wgUseESI ) {
1928                                         # We'll purge the proxy cache explicitly, but require end user agents
1929                                         # to revalidate against the proxy on each visit.
1930                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1931                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1932                                         # start with a shorter timeout for initial testing
1933                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1934                                         $response->header( 'Surrogate-Control: max-age=' . $wgSquidMaxage . '+' . $this->mSquidMaxage . ', content="ESI/1.0"' );
1935                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1936                                 } else {
1937                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1938                                         # to revalidate against the proxy on each visit.
1939                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1940                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1941                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1942                                         # start with a shorter timeout for initial testing
1943                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1944                                         $response->header( 'Cache-Control: s-maxage=' . $this->mSquidMaxage . ', must-revalidate, max-age=0' );
1945                                 }
1946                         } else {
1947                                 # We do want clients to cache if they can, but they *must* check for updates
1948                                 # on revisiting the page.
1949                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1950                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1951                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1952                         }
1953                         if ( $this->mLastModified ) {
1954                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1955                         }
1956                 } else {
1957                         wfDebug( __METHOD__ . ": no caching **\n", false );
1958
1959                         # In general, the absence of a last modified header should be enough to prevent
1960                         # the client from using its cache. We send a few other things just to make sure.
1961                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1962                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1963                         $response->header( 'Pragma: no-cache' );
1964                 }
1965         }
1966
1967         /**
1968          * Get the message associated with the HTTP response code $code
1969          *
1970          * @param $code Integer: status code
1971          * @return String or null: message or null if $code is not in the list of
1972          *         messages
1973          *
1974          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1975          */
1976         public static function getStatusMessage( $code ) {
1977                 wfDeprecated( __METHOD__, '1.18' );
1978                 return HttpStatus::getMessage( $code );
1979         }
1980
1981         /**
1982          * Finally, all the text has been munged and accumulated into
1983          * the object, let's actually output it:
1984          */
1985         public function output() {
1986                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP,
1987                         $wgUseAjax, $wgResponsiveImages;
1988
1989                 if ( $this->mDoNothing ) {
1990                         return;
1991                 }
1992
1993                 wfProfileIn( __METHOD__ );
1994
1995                 $response = $this->getRequest()->response();
1996
1997                 if ( $this->mRedirect != '' ) {
1998                         # Standards require redirect URLs to be absolute
1999                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
2000
2001                         $redirect = $this->mRedirect;
2002                         $code = $this->mRedirectCode;
2003
2004                         if ( wfRunHooks( "BeforePageRedirect", array( $this, &$redirect, &$code ) ) ) {
2005                                 if ( $code == '301' || $code == '303' ) {
2006                                         if ( !$wgDebugRedirects ) {
2007                                                 $message = HttpStatus::getMessage( $code );
2008                                                 $response->header( "HTTP/1.1 $code $message" );
2009                                         }
2010                                         $this->mLastModified = wfTimestamp( TS_RFC2822 );
2011                                 }
2012                                 if ( $wgVaryOnXFP ) {
2013                                         $this->addVaryHeader( 'X-Forwarded-Proto' );
2014                                 }
2015                                 $this->sendCacheControl();
2016
2017                                 $response->header( "Content-Type: text/html; charset=utf-8" );
2018                                 if ( $wgDebugRedirects ) {
2019                                         $url = htmlspecialchars( $redirect );
2020                                         print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
2021                                         print "<p>Location: <a href=\"$url\">$url</a></p>\n";
2022                                         print "</body>\n</html>\n";
2023                                 } else {
2024                                         $response->header( 'Location: ' . $redirect );
2025                                 }
2026                         }
2027
2028                         wfProfileOut( __METHOD__ );
2029                         return;
2030                 } elseif ( $this->mStatusCode ) {
2031                         $message = HttpStatus::getMessage( $this->mStatusCode );
2032                         if ( $message ) {
2033                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
2034                         }
2035                 }
2036
2037                 # Buffer output; final headers may depend on later processing
2038                 ob_start();
2039
2040                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
2041                 $response->header( 'Content-language: ' . $wgLanguageCode );
2042
2043                 // Prevent framing, if requested
2044                 $frameOptions = $this->getFrameOptions();
2045                 if ( $frameOptions ) {
2046                         $response->header( "X-Frame-Options: $frameOptions" );
2047                 }
2048
2049                 if ( $this->mArticleBodyOnly ) {
2050                         echo $this->mBodytext;
2051                 } else {
2052
2053                         $sk = $this->getSkin();
2054                         // add skin specific modules
2055                         $modules = $sk->getDefaultModules();
2056
2057                         // enforce various default modules for all skins
2058                         $coreModules = array(
2059                                 // keep this list as small as possible
2060                                 'mediawiki.page.startup',
2061                                 'mediawiki.user',
2062                         );
2063
2064                         // Support for high-density display images if enabled
2065                         if ( $wgResponsiveImages ) {
2066                                 $coreModules[] = 'mediawiki.hidpi';
2067                         }
2068
2069                         $this->addModules( $coreModules );
2070                         foreach ( $modules as $group ) {
2071                                 $this->addModules( $group );
2072                         }
2073                         MWDebug::addModules( $this );
2074                         if ( $wgUseAjax ) {
2075                                 // FIXME: deprecate? - not clear why this is useful
2076                                 wfRunHooks( 'AjaxAddScript', array( &$this ) );
2077                         }
2078
2079                         // Hook that allows last minute changes to the output page, e.g.
2080                         // adding of CSS or Javascript by extensions.
2081                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
2082
2083                         wfProfileIn( 'Output-skin' );
2084                         $sk->outputPage();
2085                         wfProfileOut( 'Output-skin' );
2086                 }
2087
2088                 // This hook allows last minute changes to final overall output by modifying output buffer
2089                 wfRunHooks( 'AfterFinalPageOutput', array( $this ) );
2090
2091                 $this->sendCacheControl();
2092
2093                 ob_end_flush();
2094
2095                 wfProfileOut( __METHOD__ );
2096         }
2097
2098         /**
2099          * Actually output something with print.
2100          *
2101          * @param string $ins the string to output
2102          * @deprecated since 1.22 Use echo yourself.
2103          */
2104         public function out( $ins ) {
2105                 wfDeprecated( __METHOD__, '1.22' );
2106                 print $ins;
2107         }
2108
2109         /**
2110          * Produce a "user is blocked" page.
2111          * @deprecated since 1.18
2112          */
2113         function blockedPage() {
2114                 throw new UserBlockedError( $this->getUser()->mBlock );
2115         }
2116
2117         /**
2118          * Prepare this object to display an error page; disable caching and
2119          * indexing, clear the current text and redirect, set the page's title
2120          * and optionally an custom HTML title (content of the "<title>" tag).
2121          *
2122          * @param string|Message $pageTitle will be passed directly to setPageTitle()
2123          * @param string|Message $htmlTitle will be passed directly to setHTMLTitle();
2124          *                   optional, if not passed the "<title>" attribute will be
2125          *                   based on $pageTitle
2126          */
2127         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
2128                 $this->setPageTitle( $pageTitle );
2129                 if ( $htmlTitle !== false ) {
2130                         $this->setHTMLTitle( $htmlTitle );
2131                 }
2132                 $this->setRobotPolicy( 'noindex,nofollow' );
2133                 $this->setArticleRelated( false );
2134                 $this->enableClientCache( false );
2135                 $this->mRedirect = '';
2136                 $this->clearSubtitle();
2137                 $this->clearHTML();
2138         }
2139
2140         /**
2141          * Output a standard error page
2142          *
2143          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
2144          * showErrorPage( 'titlemsg', $messageObject );
2145          * showErrorPage( $titleMessageObj, $messageObject );
2146          *
2147          * @param $title Mixed: message key (string) for page title, or a Message object
2148          * @param $msg Mixed: message key (string) for page text, or a Message object
2149          * @param array $params message parameters; ignored if $msg is a Message object
2150          */
2151         public function showErrorPage( $title, $msg, $params = array() ) {
2152                 if ( !$title instanceof Message ) {
2153                         $title = $this->msg( $title );
2154                 }
2155
2156                 $this->prepareErrorPage( $title );
2157
2158                 if ( $msg instanceof Message ) {
2159                         $this->addHTML( $msg->parseAsBlock() );
2160                 } else {
2161                         $this->addWikiMsgArray( $msg, $params );
2162                 }
2163
2164                 $this->returnToMain();
2165         }
2166
2167         /**
2168          * Output a standard permission error page
2169          *
2170          * @param array $errors error message keys
2171          * @param string $action action that was denied or null if unknown
2172          */
2173         public function showPermissionsErrorPage( $errors, $action = null ) {
2174                 // For some action (read, edit, create and upload), display a "login to do this action"
2175                 // error if all of the following conditions are met:
2176                 // 1. the user is not logged in
2177                 // 2. the only error is insufficient permissions (i.e. no block or something else)
2178                 // 3. the error can be avoided simply by logging in
2179                 if ( in_array( $action, array( 'read', 'edit', 'createpage', 'createtalk', 'upload' ) )
2180                         && $this->getUser()->isAnon() && count( $errors ) == 1 && isset( $errors[0][0] )
2181                         && ( $errors[0][0] == 'badaccess-groups' || $errors[0][0] == 'badaccess-group0' )
2182                         && ( User::groupHasPermission( 'user', $action )
2183                         || User::groupHasPermission( 'autoconfirmed', $action ) )
2184                 ) {
2185                         $displayReturnto = null;
2186
2187                         # Due to bug 32276, if a user does not have read permissions,
2188                         # $this->getTitle() will just give Special:Badtitle, which is
2189                         # not especially useful as a returnto parameter. Use the title
2190                         # from the request instead, if there was one.
2191                         $request = $this->getRequest();
2192                         $returnto = Title::newFromURL( $request->getVal( 'title', '' ) );
2193                         if ( $action == 'edit' ) {
2194                                 $msg = 'whitelistedittext';
2195                                 $displayReturnto = $returnto;
2196                         } elseif ( $action == 'createpage' || $action == 'createtalk' ) {
2197                                 $msg = 'nocreatetext';
2198                         } elseif ( $action == 'upload' ) {
2199                                 $msg = 'uploadnologintext';
2200                         } else { # Read
2201                                 $msg = 'loginreqpagetext';
2202                                 $displayReturnto = Title::newMainPage();
2203                         }
2204
2205                         $query = array();
2206
2207                         if ( $returnto ) {
2208                                 $query['returnto'] = $returnto->getPrefixedText();
2209
2210                                 if ( !$request->wasPosted() ) {
2211                                         $returntoquery = $request->getValues();
2212                                         unset( $returntoquery['title'] );
2213                                         unset( $returntoquery['returnto'] );
2214                                         unset( $returntoquery['returntoquery'] );
2215                                         $query['returntoquery'] = wfArrayToCgi( $returntoquery );
2216                                 }
2217                         }
2218                         $loginLink = Linker::linkKnown(
2219                                 SpecialPage::getTitleFor( 'Userlogin' ),
2220                                 $this->msg( 'loginreqlink' )->escaped(),
2221                                 array(),
2222                                 $query
2223                         );
2224
2225                         $this->prepareErrorPage( $this->msg( 'loginreqtitle' ) );
2226                         $this->addHTML( $this->msg( $msg )->rawParams( $loginLink )->parse() );
2227
2228                         # Don't return to a page the user can't read otherwise
2229                         # we'll end up in a pointless loop
2230                         if ( $displayReturnto && $displayReturnto->userCan( 'read', $this->getUser() ) ) {
2231                                 $this->returnToMain( null, $displayReturnto );
2232                         }
2233                 } else {
2234                         $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
2235                         $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
2236                 }
2237         }
2238
2239         /**
2240          * Display an error page indicating that a given version of MediaWiki is
2241          * required to use it
2242          *
2243          * @param $version Mixed: the version of MediaWiki needed to use the page
2244          */
2245         public function versionRequired( $version ) {
2246                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
2247
2248                 $this->addWikiMsg( 'versionrequiredtext', $version );
2249                 $this->returnToMain();
2250         }
2251
2252         /**
2253          * Display an error page noting that a given permission bit is required.
2254          * @deprecated since 1.18, just throw the exception directly
2255          * @param string $permission key required
2256          * @throws PermissionsError
2257          */
2258         public function permissionRequired( $permission ) {
2259                 throw new PermissionsError( $permission );
2260         }
2261
2262         /**
2263          * Produce the stock "please login to use the wiki" page
2264          *
2265          * @deprecated in 1.19; throw the exception directly
2266          */
2267         public function loginToUse() {
2268                 throw new PermissionsError( 'read' );
2269         }
2270
2271         /**
2272          * Format a list of error messages
2273          *
2274          * @param array $errors of arrays returned by Title::getUserPermissionsErrors
2275          * @param string $action action that was denied or null if unknown
2276          * @return String: the wikitext error-messages, formatted into a list.
2277          */
2278         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2279                 if ( $action == null ) {
2280                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2281                 } else {
2282                         $action_desc = $this->msg( "action-$action" )->plain();
2283                         $text = $this->msg(
2284                                 'permissionserrorstext-withaction',
2285                                 count( $errors ),
2286                                 $action_desc
2287                         )->plain() . "\n\n";
2288                 }
2289
2290                 if ( count( $errors ) > 1 ) {
2291                         $text .= '<ul class="permissions-errors">' . "\n";
2292
2293                         foreach ( $errors as $error ) {
2294                                 $text .= '<li>';
2295                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2296                                 $text .= "</li>\n";
2297                         }
2298                         $text .= '</ul>';
2299                 } else {
2300                         $text .= "<div class=\"permissions-errors\">\n" .
2301                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2302                                         "\n</div>";
2303                 }
2304
2305                 return $text;
2306         }
2307
2308         /**
2309          * Display a page stating that the Wiki is in read-only mode,
2310          * and optionally show the source of the page that the user
2311          * was trying to edit.  Should only be called (for this
2312          * purpose) after wfReadOnly() has returned true.
2313          *
2314          * For historical reasons, this function is _also_ used to
2315          * show the error message when a user tries to edit a page
2316          * they are not allowed to edit.  (Unless it's because they're
2317          * blocked, then we show blockedPage() instead.)  In this
2318          * case, the second parameter should be set to true and a list
2319          * of reasons supplied as the third parameter.
2320          *
2321          * @todo Needs to be split into multiple functions.
2322          *
2323          * @param $source    String: source code to show (or null).
2324          * @param $protected Boolean: is this a permissions error?
2325          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2326          * @param $action    String: action that was denied or null if unknown
2327          * @throws ReadOnlyError
2328          */
2329         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2330                 $this->setRobotPolicy( 'noindex,nofollow' );
2331                 $this->setArticleRelated( false );
2332
2333                 // If no reason is given, just supply a default "I can't let you do
2334                 // that, Dave" message.  Should only occur if called by legacy code.
2335                 if ( $protected && empty( $reasons ) ) {
2336                         $reasons[] = array( 'badaccess-group0' );
2337                 }
2338
2339                 if ( !empty( $reasons ) ) {
2340                         // Permissions error
2341                         if ( $source ) {
2342                                 $this->setPageTitle( $this->msg( 'viewsource-title', $this->getTitle()->getPrefixedText() ) );
2343                                 $this->addBacklinkSubtitle( $this->getTitle() );
2344                         } else {
2345                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2346                         }
2347                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2348                 } else {
2349                         // Wiki is read only
2350                         throw new ReadOnlyError;
2351                 }
2352
2353                 // Show source, if supplied
2354                 if ( is_string( $source ) ) {
2355                         $this->addWikiMsg( 'viewsourcetext' );
2356
2357                         $pageLang = $this->getTitle()->getPageLanguage();
2358                         $params = array(
2359                                 'id' => 'wpTextbox1',
2360                                 'name' => 'wpTextbox1',
2361                                 'cols' => $this->getUser()->getOption( 'cols' ),
2362                                 'rows' => $this->getUser()->getOption( 'rows' ),
2363                                 'readonly' => 'readonly',
2364                                 'lang' => $pageLang->getHtmlCode(),
2365                                 'dir' => $pageLang->getDir(),
2366                         );
2367                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2368
2369                         // Show templates used by this article
2370                         $templates = Linker::formatTemplates( $this->getTitle()->getTemplateLinksFrom() );
2371                         $this->addHTML( "<div class='templatesUsed'>
2372 $templates
2373 </div>
2374 " );
2375                 }
2376
2377                 # If the title doesn't exist, it's fairly pointless to print a return
2378                 # link to it.  After all, you just tried editing it and couldn't, so
2379                 # what's there to do there?
2380                 if ( $this->getTitle()->exists() ) {
2381                         $this->returnToMain( null, $this->getTitle() );
2382                 }
2383         }
2384
2385         /**
2386          * Turn off regular page output and return an error response
2387          * for when rate limiting has triggered.
2388          */
2389         public function rateLimited() {
2390                 throw new ThrottledError;
2391         }
2392
2393         /**
2394          * Show a warning about slave lag
2395          *
2396          * If the lag is higher than $wgSlaveLagCritical seconds,
2397          * then the warning is a bit more obvious. If the lag is
2398          * lower than $wgSlaveLagWarning, then no warning is shown.
2399          *
2400          * @param $lag Integer: slave lag
2401          */
2402         public function showLagWarning( $lag ) {
2403                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2404                 if ( $lag >= $wgSlaveLagWarning ) {
2405                         $message = $lag < $wgSlaveLagCritical
2406                                 ? 'lag-warn-normal'
2407                                 : 'lag-warn-high';
2408                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2409                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLanguage()->formatNum( $lag ) ) );
2410                 }
2411         }
2412
2413         public function showFatalError( $message ) {
2414                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2415
2416                 $this->addHTML( $message );
2417         }
2418
2419         public function showUnexpectedValueError( $name, $val ) {
2420                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2421         }
2422
2423         public function showFileCopyError( $old, $new ) {
2424                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2425         }
2426
2427         public function showFileRenameError( $old, $new ) {
2428                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2429         }
2430
2431         public function showFileDeleteError( $name ) {
2432                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2433         }
2434
2435         public function showFileNotFoundError( $name ) {
2436                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2437         }
2438
2439         /**
2440          * Add a "return to" link pointing to a specified title
2441          *
2442          * @param $title Title to link
2443          * @param array $query query string parameters
2444          * @param string $text text of the link (input is not escaped)
2445          * @param $options Options array to pass to Linker
2446          */
2447         public function addReturnTo( $title, $query = array(), $text = null, $options = array() ) {
2448                 $link = $this->msg( 'returnto' )->rawParams(
2449                         Linker::link( $title, $text, array(), $query, $options ) )->escaped();
2450                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2451         }
2452
2453         /**
2454          * Add a "return to" link pointing to a specified title,
2455          * or the title indicated in the request, or else the main page
2456          *
2457          * @param $unused
2458          * @param $returnto Title or String to return to
2459          * @param string $returntoquery query string for the return to link
2460          */
2461         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2462                 if ( $returnto == null ) {
2463                         $returnto = $this->getRequest()->getText( 'returnto' );
2464                 }
2465
2466                 if ( $returntoquery == null ) {
2467                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2468                 }
2469
2470                 if ( $returnto === '' ) {
2471                         $returnto = Title::newMainPage();
2472                 }
2473
2474                 if ( is_object( $returnto ) ) {
2475                         $titleObj = $returnto;
2476                 } else {
2477                         $titleObj = Title::newFromText( $returnto );
2478                 }
2479                 if ( !is_object( $titleObj ) ) {
2480                         $titleObj = Title::newMainPage();
2481                 }
2482
2483                 $this->addReturnTo( $titleObj, wfCgiToArray( $returntoquery ) );
2484         }
2485
2486         /**
2487          * @param $sk Skin The given Skin
2488          * @param $includeStyle Boolean: unused
2489          * @return String: The doctype, opening "<html>", and head element.
2490          */
2491         public function headElement( Skin $sk, $includeStyle = true ) {
2492                 global $wgContLang, $wgMimeType;
2493
2494                 $userdir = $this->getLanguage()->getDir();
2495                 $sitedir = $wgContLang->getDir();
2496
2497                 $ret = Html::htmlHeader( array( 'lang' => $this->getLanguage()->getHtmlCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2498
2499                 if ( $this->getHTMLTitle() == '' ) {
2500                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2501                 }
2502
2503                 $openHead = Html::openElement( 'head' );
2504                 if ( $openHead ) {
2505                         # Don't bother with the newline if $head == ''
2506                         $ret .= "$openHead\n";
2507                 }
2508
2509                 if ( !Html::isXmlMimeType( $wgMimeType ) ) {
2510                         // Add <meta charset="UTF-8">
2511                         // This should be before <title> since it defines the charset used by
2512                         // text including the text inside <title>.
2513                         // The spec recommends defining XHTML5's charset using the XML declaration
2514                         // instead of meta.
2515                         // Our XML declaration is output by Html::htmlHeader.
2516                         // http://www.whatwg.org/html/semantics.html#attr-meta-http-equiv-content-type
2517                         // http://www.whatwg.org/html/semantics.html#charset
2518                         $ret .= Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2519                 }
2520
2521                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2522
2523                 $ret .= implode( "\n", array(
2524                         $this->getHeadLinks(),
2525                         $this->buildCssLinks(),
2526                         $this->getHeadScripts(),
2527                         $this->getHeadItems()
2528                 ) );
2529
2530                 $closeHead = Html::closeElement( 'head' );
2531                 if ( $closeHead ) {
2532                         $ret .= "$closeHead\n";
2533                 }
2534
2535                 $bodyClasses = array();
2536                 $bodyClasses[] = 'mediawiki';
2537
2538                 # Classes for LTR/RTL directionality support
2539                 $bodyClasses[] = $userdir;
2540                 $bodyClasses[] = "sitedir-$sitedir";
2541
2542                 if ( $this->getLanguage()->capitalizeAllNouns() ) {
2543                         # A <body> class is probably not the best way to do this . . .
2544                         $bodyClasses[] = 'capitalize-all-nouns';
2545                 }
2546
2547                 $bodyClasses[] = $sk->getPageClasses( $this->getTitle() );
2548                 $bodyClasses[] = 'skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2549                 $bodyClasses[] = 'action-' . Sanitizer::escapeClass( Action::getActionName( $this->getContext() ) );
2550
2551                 $bodyAttrs = array();
2552                 // While the implode() is not strictly needed, it's used for backwards compatibility
2553                 // (this used to be built as a string and hooks likely still expect that).
2554                 $bodyAttrs['class'] = implode( ' ', $bodyClasses );
2555
2556                 // Allow skins and extensions to add body attributes they need
2557                 $sk->addToBodyAttributes( $this, $bodyAttrs );
2558                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2559
2560                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2561
2562                 return $ret;
2563         }
2564
2565         /**
2566          * Get a ResourceLoader object associated with this OutputPage
2567          *
2568          * @return ResourceLoader
2569          */
2570         public function getResourceLoader() {
2571                 if ( is_null( $this->mResourceLoader ) ) {
2572                         $this->mResourceLoader = new ResourceLoader();
2573                 }
2574                 return $this->mResourceLoader;
2575         }
2576
2577         /**
2578          * TODO: Document
2579          * @param $modules Array/string with the module name(s)
2580          * @param string $only ResourceLoaderModule TYPE_ class constant
2581          * @param $useESI boolean
2582          * @param array $extraQuery with extra query parameters to add to each request. array( param => value )
2583          * @param $loadCall boolean If true, output an (asynchronous) mw.loader.load() call rather than a "<script src='...'>" tag
2584          * @return string html "<script>" and "<style>" tags
2585          */
2586         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array(), $loadCall = false ) {
2587                 global $wgResourceLoaderUseESI;
2588
2589                 $modules = (array)$modules;
2590
2591                 if ( !count( $modules ) ) {
2592                         return '';
2593                 }
2594
2595                 if ( count( $modules ) > 1 ) {
2596                         // Remove duplicate module requests
2597                         $modules = array_unique( $modules );
2598                         // Sort module names so requests are more uniform
2599                         sort( $modules );
2600
2601                         if ( ResourceLoader::inDebugMode() ) {
2602                                 // Recursively call us for every item
2603                                 $links = '';
2604                                 foreach ( $modules as $name ) {
2605                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2606                                 }
2607                                 return $links;
2608                         }
2609                 }
2610                 if ( !is_null( $this->mTarget ) ) {
2611                         $extraQuery['target'] = $this->mTarget;
2612                 }
2613
2614                 // Create keyed-by-group list of module objects from modules list
2615                 $groups = array();
2616                 $resourceLoader = $this->getResourceLoader();
2617                 foreach ( $modules as $name ) {
2618                         $module = $resourceLoader->getModule( $name );
2619                         # Check that we're allowed to include this module on this page
2620                         if ( !$module
2621                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2622                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2623                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2624                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2625                                 || ( $this->mTarget && !in_array( $this->mTarget, $module->getTargets() ) )
2626                         ) {
2627                                 continue;
2628                         }
2629
2630                         $group = $module->getGroup();
2631                         if ( !isset( $groups[$group] ) ) {
2632                                 $groups[$group] = array();
2633                         }
2634                         $groups[$group][$name] = $module;
2635                 }
2636
2637                 $links = '';
2638                 foreach ( $groups as $group => $grpModules ) {
2639                         // Special handling for user-specific groups
2640                         $user = null;
2641                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2642                                 $user = $this->getUser()->getName();
2643                         }
2644
2645                         // Create a fake request based on the one we are about to make so modules return
2646                         // correct timestamp and emptiness data
2647                         $query = ResourceLoader::makeLoaderQuery(
2648                                 array(), // modules; not determined yet
2649                                 $this->getLanguage()->getCode(),
2650                                 $this->getSkin()->getSkinName(),
2651                                 $user,
2652                                 null, // version; not determined yet
2653                                 ResourceLoader::inDebugMode(),
2654                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2655                                 $this->isPrintable(),
2656                                 $this->getRequest()->getBool( 'handheld' ),
2657                                 $extraQuery
2658                         );
2659                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2660                         // Extract modules that know they're empty
2661                         $emptyModules = array();
2662                         foreach ( $grpModules as $key => $module ) {
2663                                 if ( $module->isKnownEmpty( $context ) ) {
2664                                         $emptyModules[$key] = 'ready';
2665                                         unset( $grpModules[$key] );
2666                                 }
2667                         }
2668                         // Inline empty modules: since they're empty, just mark them as 'ready'
2669                         if ( count( $emptyModules ) > 0 && $only !== ResourceLoaderModule::TYPE_STYLES ) {
2670                                 // If we're only getting the styles, we don't need to do anything for empty modules.
2671                                 $links .= Html::inlineScript(
2672                                                 ResourceLoader::makeLoaderConditionalScript(
2673                                                                 ResourceLoader::makeLoaderStateScript( $emptyModules )
2674                                                 )
2675                                 ) . "\n";
2676                         }
2677
2678                         // If there are no modules left, skip this group
2679                         if ( count( $grpModules ) === 0 ) {
2680                                 continue;
2681                         }
2682
2683                         // Inline private modules. These can't be loaded through load.php for security
2684                         // reasons, see bug 34907. Note that these modules should be loaded from
2685                         // getHeadScripts() before the first loader call. Otherwise other modules can't
2686                         // properly use them as dependencies (bug 30914)
2687                         if ( $group === 'private' ) {
2688                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2689                                         $links .= Html::inlineStyle(
2690                                                 $resourceLoader->makeModuleResponse( $context, $grpModules )
2691                                         );
2692                                 } else {
2693                                         $links .= Html::inlineScript(
2694                                                 ResourceLoader::makeLoaderConditionalScript(
2695                                                         $resourceLoader->makeModuleResponse( $context, $grpModules )
2696                                                 )
2697                                         );
2698                                 }
2699                                 $links .= "\n";
2700                                 continue;
2701                         }
2702                         // Special handling for the user group; because users might change their stuff
2703                         // on-wiki like user pages, or user preferences; we need to find the highest
2704                         // timestamp of these user-changeable modules so we can ensure cache misses on change
2705                         // This should NOT be done for the site group (bug 27564) because anons get that too
2706                         // and we shouldn't be putting timestamps in Squid-cached HTML
2707                         $version = null;
2708                         if ( $group === 'user' ) {
2709                                 // Get the maximum timestamp
2710                                 $timestamp = 1;
2711                                 foreach ( $grpModules as $module ) {
2712                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2713                                 }
2714                                 // Add a version parameter so cache will break when things change
2715                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2716                         }
2717
2718                         $url = ResourceLoader::makeLoaderURL(
2719                                 array_keys( $grpModules ),
2720                                 $this->getLanguage()->getCode(),
2721                                 $this->getSkin()->getSkinName(),
2722                                 $user,
2723                                 $version,
2724                                 ResourceLoader::inDebugMode(),
2725                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2726                                 $this->isPrintable(),
2727                                 $this->getRequest()->getBool( 'handheld' ),
2728                                 $extraQuery
2729                         );
2730                         if ( $useESI && $wgResourceLoaderUseESI ) {
2731                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2732                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2733                                         $link = Html::inlineStyle( $esi );
2734                                 } else {
2735                                         $link = Html::inlineScript( $esi );
2736                                 }
2737                         } else {
2738                                 // Automatically select style/script elements
2739                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2740                                         $link = Html::linkedStyle( $url );
2741                                 } elseif ( $loadCall ) {
2742                                         $link = Html::inlineScript(
2743                                                 ResourceLoader::makeLoaderConditionalScript(
2744                                                         Xml::encodeJsCall( 'mw.loader.load', array( $url, 'text/javascript', true ) )
2745                                                 )
2746                                         );
2747                                 } else {
2748                                         $link = Html::linkedScript( $url );
2749                                 }
2750                         }
2751
2752                         if ( $group == 'noscript' ) {
2753                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2754                         } else {
2755                                 $links .= $link . "\n";
2756                         }
2757                 }
2758                 return $links;
2759         }
2760
2761         /**
2762          * JS stuff to put in the "<head>". This is the startup module, config
2763          * vars and modules marked with position 'top'
2764          *
2765          * @return String: HTML fragment
2766          */
2767         function getHeadScripts() {
2768                 global $wgResourceLoaderExperimentalAsyncLoading;
2769
2770                 // Startup - this will immediately load jquery and mediawiki modules
2771                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2772
2773                 // Load config before anything else
2774                 $scripts .= Html::inlineScript(
2775                         ResourceLoader::makeLoaderConditionalScript(
2776                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2777                         )
2778                 );
2779
2780                 // Load embeddable private modules before any loader links
2781                 // This needs to be TYPE_COMBINED so these modules are properly wrapped
2782                 // in mw.loader.implement() calls and deferred until mw.user is available
2783                 $embedScripts = array( 'user.options', 'user.tokens' );
2784                 $scripts .= $this->makeResourceLoaderLink( $embedScripts, ResourceLoaderModule::TYPE_COMBINED );
2785
2786                 // Script and Messages "only" requests marked for top inclusion
2787                 // Messages should go first
2788                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2789                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2790
2791                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2792                 // Only load modules that have marked themselves for loading at the top
2793                 $modules = $this->getModules( true, 'top' );
2794                 if ( $modules ) {
2795                         $scripts .= Html::inlineScript(
2796                                 ResourceLoader::makeLoaderConditionalScript(
2797                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2798                                 )
2799                         );
2800                 }
2801
2802                 if ( $wgResourceLoaderExperimentalAsyncLoading ) {
2803                         $scripts .= $this->getScriptsForBottomQueue( true );
2804                 }
2805
2806                 return $scripts;
2807         }
2808
2809         /**
2810          * JS stuff to put at the 'bottom', which can either be the bottom of the "<body>"
2811          * or the bottom of the "<head>" depending on $wgResourceLoaderExperimentalAsyncLoading:
2812          * modules marked with position 'bottom', legacy scripts ($this->mScripts),
2813          * user preferences, site JS and user JS
2814          *
2815          * @param $inHead boolean If true, this HTML goes into the "<head>", if false it goes into the "<body>"
2816          * @return string
2817          */
2818         function getScriptsForBottomQueue( $inHead ) {
2819                 global $wgUseSiteJs, $wgAllowUserJs;
2820
2821                 // Script and Messages "only" requests marked for bottom inclusion
2822                 // If we're in the <head>, use load() calls rather than <script src="..."> tags
2823                 // Messages should go first
2824                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ),
2825                         ResourceLoaderModule::TYPE_MESSAGES, /* $useESI = */ false, /* $extraQuery = */ array(),
2826                         /* $loadCall = */ $inHead
2827                 );
2828                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ),
2829                         ResourceLoaderModule::TYPE_SCRIPTS, /* $useESI = */ false, /* $extraQuery = */ array(),
2830                         /* $loadCall = */ $inHead
2831                 );
2832
2833                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2834                 // Only load modules that have marked themselves for loading at the bottom
2835                 $modules = $this->getModules( true, 'bottom' );
2836                 if ( $modules ) {
2837                         $scripts .= Html::inlineScript(
2838                                 ResourceLoader::makeLoaderConditionalScript(
2839                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules, null, true ) )
2840                                 )
2841                         );
2842                 }
2843
2844                 // Legacy Scripts
2845                 $scripts .= "\n" . $this->mScripts;
2846
2847                 $defaultModules = array();
2848
2849                 // Add site JS if enabled
2850                 if ( $wgUseSiteJs ) {
2851                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS,
2852                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2853                         );
2854                         $defaultModules['site'] = 'loading';
2855                 } else {
2856                         // Site module is empty, save request by marking ready in advance (bug 46857)
2857                         $defaultModules['site'] = 'ready';
2858                 }
2859
2860                 // Add user JS if enabled
2861                 if ( $wgAllowUserJs ) {
2862                         if ( $this->getUser()->isLoggedIn() ) {
2863                                 if ( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2864                                         # XXX: additional security check/prompt?
2865                                         // We're on a preview of a JS subpage
2866                                         // Exclude this page from the user module in case it's in there (bug 26283)
2867                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2868                                                 array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() ), $inHead
2869                                         );
2870                                         // Load the previewed JS
2871                                         $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2872                                         // FIXME: If the user is previewing, say, ./vector.js, his ./common.js will be loaded
2873                                         // asynchronously and may arrive *after* the inline script here. So the previewed code
2874                                         // may execute before ./common.js runs. Normally, ./common.js runs before ./vector.js...
2875                                 } else {
2876                                         // Include the user module normally, i.e., raw to avoid it being wrapped in a closure.
2877                                         $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS,
2878                                                 /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2879                                         );
2880                                 }
2881                                 $defaultModules['user'] = 'loading';
2882                         } else {
2883                                 // Non-logged-in users have an empty user module.
2884                                 // Save request by marking ready in advance (bug 46857)
2885                                 $defaultModules['user'] = 'ready';
2886                         }
2887                 } else {
2888                         // User modules are disabled on this wiki.
2889                         // Save request by marking ready in advance (bug 46857)
2890                         $defaultModules['user'] = 'ready';
2891                 }
2892
2893                 // Group JS is only enabled if site JS is enabled.
2894                 if ( $wgUseSiteJs ) {
2895                         if ( $this->getUser()->isLoggedIn() ) {
2896                                 $scripts .= $this->makeResourceLoaderLink( 'user.groups', ResourceLoaderModule::TYPE_COMBINED,
2897                                         /* $useESI = */ false, /* $extraQuery = */ array(), /* $loadCall = */ $inHead
2898                                 );
2899                                 $defaultModules['user.groups'] = 'loading';
2900                         } else {
2901                                 // Non-logged-in users have no user.groups module.
2902                                 // Save request by marking ready in advance (bug 46857)
2903                                 $defaultModules['user.groups'] = 'ready';
2904                         }
2905                 } else {
2906                         // Site (and group JS) disabled
2907                         $defaultModules['user.groups'] = 'ready';
2908                 }
2909
2910                 $loaderInit = '';
2911                 if ( $inHead ) {
2912                         // We generate loader calls anyway, so no need to fix the client-side loader's state to 'loading'.
2913                         foreach ( $defaultModules as $m => $state ) {
2914                                 if ( $state == 'loading' ) {
2915                                         unset( $defaultModules[$m] );
2916                                 }
2917                         }
2918                 }
2919                 if ( count( $defaultModules ) > 0 ) {
2920                         $loaderInit = Html::inlineScript(
2921                                 ResourceLoader::makeLoaderConditionalScript(
2922                                         ResourceLoader::makeLoaderStateScript( $defaultModules )
2923                                 )
2924                         ) . "\n";
2925                 }
2926                 return $loaderInit . $scripts;
2927         }
2928
2929         /**
2930          * JS stuff to put at the bottom of the "<body>"
2931          * @return string
2932          */
2933         function getBottomScripts() {
2934                 global $wgResourceLoaderExperimentalAsyncLoading;
2935
2936                 // Optimise jQuery ready event cross-browser.
2937                 // This also enforces $.isReady to be true at </body> which fixes the
2938                 // mw.loader bug in Firefox with using document.write between </body>
2939                 // and the DOMContentReady event (bug 47457).
2940                 $html = Html::inlineScript( 'window.jQuery && jQuery.ready();' );
2941
2942                 if ( !$wgResourceLoaderExperimentalAsyncLoading ) {
2943                         $html .= $this->getScriptsForBottomQueue( false );
2944                 }
2945
2946                 return $html;
2947         }
2948
2949         /**
2950          * Add one or more variables to be set in mw.config in JavaScript.
2951          *
2952          * @param $keys {String|Array} Key or array of key/value pairs.
2953          * @param $value {Mixed} [optional] Value of the configuration variable.
2954          */
2955         public function addJsConfigVars( $keys, $value = null ) {
2956                 if ( is_array( $keys ) ) {
2957                         foreach ( $keys as $key => $value ) {
2958                                 $this->mJsConfigVars[$key] = $value;
2959                         }
2960                         return;
2961                 }
2962
2963                 $this->mJsConfigVars[$keys] = $value;
2964         }
2965
2966         /**
2967          * Get an array containing the variables to be set in mw.config in JavaScript.
2968          *
2969          * DO NOT CALL THIS FROM OUTSIDE OF THIS CLASS OR Skin::makeGlobalVariablesScript().
2970          * This is only public until that function is removed. You have been warned.
2971          *
2972          * Do not add things here which can be evaluated in ResourceLoaderStartUpModule
2973          * - in other words, page-independent/site-wide variables (without state).
2974          * You will only be adding bloat to the html page and causing page caches to
2975          * have to be purged on configuration changes.
2976          * @return array
2977          */
2978         public function getJSVars() {
2979                 global $wgContLang;
2980
2981                 $curRevisionId = 0;
2982                 $articleId = 0;
2983                 $canonicalSpecialPageName = false; # bug 21115
2984
2985                 $title = $this->getTitle();
2986                 $ns = $title->getNamespace();
2987                 $canonicalNamespace = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2988
2989                 $sk = $this->getSkin();
2990                 // Get the relevant title so that AJAX features can use the correct page name
2991                 // when making API requests from certain special pages (bug 34972).
2992                 $relevantTitle = $sk->getRelevantTitle();
2993                 $relevantUser = $sk->getRelevantUser();
2994
2995                 if ( $ns == NS_SPECIAL ) {
2996                         list( $canonicalSpecialPageName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2997                 } elseif ( $this->canUseWikiPage() ) {
2998                         $wikiPage = $this->getWikiPage();
2999                         $curRevisionId = $wikiPage->getLatest();
3000                         $articleId = $wikiPage->getId();
3001                 }
3002
3003                 $lang = $title->getPageLanguage();
3004
3005                 // Pre-process information
3006                 $separatorTransTable = $lang->separatorTransformTable();
3007                 $separatorTransTable = $separatorTransTable ? $separatorTransTable : array();
3008                 $compactSeparatorTransTable = array(
3009                         implode( "\t", array_keys( $separatorTransTable ) ),
3010                         implode( "\t", $separatorTransTable ),
3011                 );
3012                 $digitTransTable = $lang->digitTransformTable();
3013                 $digitTransTable = $digitTransTable ? $digitTransTable : array();
3014                 $compactDigitTransTable = array(
3015                         implode( "\t", array_keys( $digitTransTable ) ),
3016                         implode( "\t", $digitTransTable ),
3017                 );
3018
3019                 $user = $this->getUser();
3020
3021                 $vars = array(
3022                         'wgCanonicalNamespace' => $canonicalNamespace,
3023                         'wgCanonicalSpecialPageName' => $canonicalSpecialPageName,
3024                         'wgNamespaceNumber' => $title->getNamespace(),
3025                         'wgPageName' => $title->getPrefixedDBkey(),
3026                         'wgTitle' => $title->getText(),
3027                         'wgCurRevisionId' => $curRevisionId,
3028                         'wgRevisionId' => (int)$this->getRevisionId(),
3029                         'wgArticleId' => $articleId,
3030                         'wgIsArticle' => $this->isArticle(),
3031                         'wgIsRedirect' => $title->isRedirect(),
3032                         'wgAction' => Action::getActionName( $this->getContext() ),
3033                         'wgUserName' => $user->isAnon() ? null : $user->getName(),
3034                         'wgUserGroups' => $user->getEffectiveGroups(),
3035                         'wgCategories' => $this->getCategories(),
3036                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
3037                         'wgPageContentLanguage' => $lang->getCode(),
3038                         'wgPageContentModel' => $title->getContentModel(),
3039                         'wgSeparatorTransformTable' => $compactSeparatorTransTable,
3040                         'wgDigitTransformTable' => $compactDigitTransTable,
3041                         'wgDefaultDateFormat' => $lang->getDefaultDateFormat(),
3042                         'wgMonthNames' => $lang->getMonthNamesArray(),
3043                         'wgMonthNamesShort' => $lang->getMonthAbbreviationsArray(),
3044                         'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
3045                 );
3046                 if ( $user->isLoggedIn() ) {
3047                         $vars['wgUserId'] = $user->getId();
3048                         $vars['wgUserEditCount'] = $user->getEditCount();
3049                         $userReg = wfTimestampOrNull( TS_UNIX, $user->getRegistration() );
3050                         $vars['wgUserRegistration'] = $userReg !== null ? ( $userReg * 1000 ) : null;
3051                         // Get the revision ID of the oldest new message on the user's talk
3052                         // page. This can be used for constructing new message alerts on
3053                         // the client side.
3054                         $vars['wgUserNewMsgRevisionId'] = $user->getNewMessageRevisionId();
3055                 }
3056                 if ( $wgContLang->hasVariants() ) {
3057                         $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
3058                 }
3059                 // Same test as SkinTemplate
3060                 $vars['wgIsProbablyEditable'] = $title->quickUserCan( 'edit', $user ) && ( $title->exists() || $title->quickUserCan( 'create', $user ) );
3061                 foreach ( $title->getRestrictionTypes() as $type ) {
3062                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
3063                 }
3064                 if ( $title->isMainPage() ) {
3065                         $vars['wgIsMainPage'] = true;
3066                 }
3067                 if ( $this->mRedirectedFrom ) {
3068                         $vars['wgRedirectedFrom'] = $this->mRedirectedFrom->getPrefixedDBkey();
3069                 }
3070                 if ( $relevantUser ) {
3071                         $vars['wgRelevantUserName'] = $relevantUser->getName();
3072                 }
3073
3074                 // Allow extensions to add their custom variables to the mw.config map.
3075                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
3076                 // page-dependant but site-wide (without state).
3077                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
3078                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, $this ) );
3079
3080                 // Merge in variables from addJsConfigVars last
3081                 return array_merge( $vars, $this->mJsConfigVars );
3082         }
3083
3084         /**
3085          * To make it harder for someone to slip a user a fake
3086          * user-JavaScript or user-CSS preview, a random token
3087          * is associated with the login session. If it's not
3088          * passed back with the preview request, we won't render
3089          * the code.
3090          *
3091          * @return bool
3092          */
3093         public function userCanPreview() {
3094                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
3095                         || !$this->getRequest()->wasPosted()
3096                         || !$this->getUser()->matchEditToken(
3097                                 $this->getRequest()->getVal( 'wpEditToken' ) )
3098                 ) {
3099                         return false;
3100                 }
3101                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
3102                         return false;
3103                 }
3104
3105                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
3106         }
3107
3108         /**
3109          * @return array in format "link name or number => 'link html'".
3110          */
3111         public function getHeadLinksArray() {
3112                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
3113                         $wgSitename, $wgVersion,
3114                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
3115                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
3116                         $wgRightsPage, $wgRightsUrl;
3117
3118                 $tags = array();
3119
3120                 $canonicalUrl = $this->mCanonicalUrl;
3121
3122                 $tags['meta-generator'] = Html::element( 'meta', array(
3123                         'name' => 'generator',
3124                         'content' => "MediaWiki $wgVersion",
3125                 ) );
3126
3127                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
3128                 if ( $p !== 'index,follow' ) {
3129                         // http://www.robotstxt.org/wc/meta-user.html
3130                         // Only show if it's different from the default robots policy
3131                         $tags['meta-robots'] = Html::element( 'meta', array(
3132                                 'name' => 'robots',
3133                                 'content' => $p,
3134                         ) );
3135                 }
3136
3137                 foreach ( $this->mMetatags as $tag ) {
3138                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
3139                                 $a = 'http-equiv';
3140                                 $tag[0] = substr( $tag[0], 5 );
3141                         } else {
3142                                 $a = 'name';
3143                         }
3144                         $tagName = "meta-{$tag[0]}";
3145                         if ( isset( $tags[$tagName] ) ) {
3146                                 $tagName .= $tag[1];
3147                         }
3148                         $tags[$tagName] = Html::element( 'meta',
3149                                 array(
3150                                         $a => $tag[0],
3151                                         'content' => $tag[1]
3152                                 )
3153                         );
3154                 }
3155
3156                 foreach ( $this->mLinktags as $tag ) {
3157                         $tags[] = Html::element( 'link', $tag );
3158                 }
3159
3160                 # Universal edit button
3161                 if ( $wgUniversalEditButton && $this->isArticleRelated() ) {
3162                         $user = $this->getUser();
3163                         if ( $this->getTitle()->quickUserCan( 'edit', $user )
3164                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create', $user ) ) ) {
3165                                 // Original UniversalEditButton
3166                                 $msg = $this->msg( 'edit' )->text();
3167                                 $tags['universal-edit-button'] = Html::element( 'link', array(
3168                                         'rel' => 'alternate',
3169                                         'type' => 'application/x-wiki',
3170                                         'title' => $msg,
3171                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3172                                 ) );
3173                                 // Alternate edit link
3174                                 $tags['alternative-edit'] = Html::element( 'link', array(
3175                                         'rel' => 'edit',
3176                                         'title' => $msg,
3177                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
3178                                 ) );
3179                         }
3180                 }
3181
3182                 # Generally the order of the favicon and apple-touch-icon links
3183                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
3184                 # uses whichever one appears later in the HTML source. Make sure
3185                 # apple-touch-icon is specified first to avoid this.
3186                 if ( $wgAppleTouchIcon !== false ) {
3187                         $tags['apple-touch-icon'] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
3188                 }
3189
3190                 if ( $wgFavicon !== false ) {
3191                         $tags['favicon'] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
3192                 }
3193
3194                 # OpenSearch description link
3195                 $tags['opensearch'] = Html::element( 'link', array(
3196                         'rel' => 'search',
3197                         'type' => 'application/opensearchdescription+xml',
3198                         'href' => wfScript( 'opensearch_desc' ),
3199                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
3200                 ) );
3201
3202                 if ( $wgEnableAPI ) {
3203                         # Real Simple Discovery link, provides auto-discovery information
3204                         # for the MediaWiki API (and potentially additional custom API
3205                         # support such as WordPress or Twitter-compatible APIs for a
3206                         # blogging extension, etc)
3207                         $tags['rsd'] = Html::element( 'link', array(
3208                                 'rel' => 'EditURI',
3209                                 'type' => 'application/rsd+xml',
3210                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
3211                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
3212                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
3213                         ) );
3214                 }
3215
3216                 # Language variants
3217                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks ) {
3218                         $lang = $this->getTitle()->getPageLanguage();
3219                         if ( $lang->hasVariants() ) {
3220
3221                                 $urlvar = $lang->getURLVariant();
3222
3223                                 if ( !$urlvar ) {
3224                                         $variants = $lang->getVariants();
3225                                         foreach ( $variants as $_v ) {
3226                                                 $tags["variant-$_v"] = Html::element( 'link', array(
3227                                                         'rel' => 'alternate',
3228                                                         'hreflang' => wfBCP47( $_v ),
3229                                                         'href' => $this->getTitle()->getLocalURL( array( 'variant' => $_v ) ) )
3230                                                 );
3231                                         }
3232                                 } else {
3233                                         $canonicalUrl = $this->getTitle()->getLocalURL();
3234                                 }
3235                         }
3236                 }
3237
3238                 # Copyright
3239                 $copyright = '';
3240                 if ( $wgRightsPage ) {
3241                         $copy = Title::newFromText( $wgRightsPage );
3242
3243                         if ( $copy ) {
3244                                 $copyright = $copy->getLocalURL();
3245                         }
3246                 }
3247
3248                 if ( !$copyright && $wgRightsUrl ) {
3249                         $copyright = $wgRightsUrl;
3250                 }
3251
3252                 if ( $copyright ) {
3253                         $tags['copyright'] = Html::element( 'link', array(
3254                                 'rel' => 'copyright',
3255                                 'href' => $copyright )
3256                         );
3257                 }
3258
3259                 # Feeds
3260                 if ( $wgFeed ) {
3261                         foreach ( $this->getSyndicationLinks() as $format => $link ) {
3262                                 # Use the page name for the title.  In principle, this could
3263                                 # lead to issues with having the same name for different feeds
3264                                 # corresponding to the same page, but we can't avoid that at
3265                                 # this low a level.
3266
3267                                 $tags[] = $this->feedLink(
3268                                         $format,
3269                                         $link,
3270                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
3271                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
3272                                 );
3273                         }
3274
3275                         # Recent changes feed should appear on every page (except recentchanges,
3276                         # that would be redundant). Put it after the per-page feed to avoid
3277                         # changing existing behavior. It's still available, probably via a
3278                         # menu in your browser. Some sites might have a different feed they'd
3279                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
3280                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
3281                         # If so, use it instead.
3282                         if ( $wgOverrideSiteFeed ) {
3283                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
3284                                         // Note, this->feedLink escapes the url.
3285                                         $tags[] = $this->feedLink(
3286                                                 $type,
3287                                                 $feedUrl,
3288                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
3289                                         );
3290                                 }
3291                         } elseif ( !$this->getTitle()->isSpecial( 'Recentchanges' ) ) {
3292                                 $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
3293                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
3294                                         $tags[] = $this->feedLink(
3295                                                 $format,
3296                                                 $rctitle->getLocalURL( array( 'feed' => $format ) ),
3297                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
3298                                         );
3299                                 }
3300                         }
3301                 }
3302
3303                 # Canonical URL
3304                 global $wgEnableCanonicalServerLink;
3305                 if ( $wgEnableCanonicalServerLink ) {
3306                         if ( $canonicalUrl !== false ) {
3307                                 $canonicalUrl = wfExpandUrl( $canonicalUrl, PROTO_CANONICAL );
3308                         } else {
3309                                 $reqUrl = $this->getRequest()->getRequestURL();
3310                                 $canonicalUrl = wfExpandUrl( $reqUrl, PROTO_CANONICAL );
3311                         }
3312                 }
3313                 if ( $canonicalUrl !== false ) {
3314                         $tags[] = Html::element( 'link', array(
3315                                 'rel' => 'canonical',
3316                                 'href' => $canonicalUrl
3317                         ) );
3318                 }
3319
3320                 return $tags;
3321         }
3322
3323         /**
3324          * @return string HTML tag links to be put in the header.
3325          */
3326         public function getHeadLinks() {
3327                 return implode( "\n", $this->getHeadLinksArray() );
3328         }
3329
3330         /**
3331          * Generate a "<link rel/>" for a feed.
3332          *
3333          * @param string $type feed type
3334          * @param string $url URL to the feed
3335          * @param string $text value of the "title" attribute
3336          * @return String: HTML fragment
3337          */
3338         private function feedLink( $type, $url, $text ) {
3339                 return Html::element( 'link', array(
3340                         'rel' => 'alternate',
3341                         'type' => "application/$type+xml",
3342                         'title' => $text,
3343                         'href' => $url )
3344                 );
3345         }
3346
3347         /**
3348          * Add a local or specified stylesheet, with the given media options.
3349          * Meant primarily for internal use...
3350          *
3351          * @param string $style URL to the file
3352          * @param string $media to specify a media type, 'screen', 'printable', 'handheld' or any.
3353          * @param string $condition for IE conditional comments, specifying an IE version
3354          * @param string $dir set to 'rtl' or 'ltr' for direction-specific sheets
3355          */
3356         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
3357                 $options = array();
3358                 // Even though we expect the media type to be lowercase, but here we
3359                 // force it to lowercase to be safe.
3360                 if ( $media ) {
3361                         $options['media'] = $media;
3362                 }
3363                 if ( $condition ) {
3364                         $options['condition'] = $condition;
3365                 }
3366                 if ( $dir ) {
3367                         $options['dir'] = $dir;
3368                 }
3369                 $this->styles[$style] = $options;
3370         }
3371
3372         /**
3373          * Adds inline CSS styles
3374          * @param $style_css Mixed: inline CSS
3375          * @param string $flip Set to 'flip' to flip the CSS if needed
3376          */
3377         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3378                 if ( $flip === 'flip' && $this->getLanguage()->isRTL() ) {
3379                         # If wanted, and the interface is right-to-left, flip the CSS
3380                         $style_css = CSSJanus::transform( $style_css, true, false );
3381                 }
3382                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3383         }
3384
3385         /**
3386          * Build a set of "<link>" elements for the stylesheets specified in the $this->styles array.
3387          * These will be applied to various media & IE conditionals.
3388          *
3389          * @return string
3390          */
3391         public function buildCssLinks() {
3392                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs, $wgContLang;
3393
3394                 $this->getSkin()->setupSkinUserCss( $this );
3395
3396                 // Add ResourceLoader styles
3397                 // Split the styles into four groups
3398                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3399                 $otherTags = ''; // Tags to append after the normal <link> tags
3400                 $resourceLoader = $this->getResourceLoader();
3401
3402                 $moduleStyles = $this->getModuleStyles();
3403
3404                 // Per-site custom styles
3405                 if ( $wgUseSiteCss ) {
3406                         $moduleStyles[] = 'site';
3407                         $moduleStyles[] = 'noscript';
3408                         if ( $this->getUser()->isLoggedIn() ) {
3409                                 $moduleStyles[] = 'user.groups';
3410                         }
3411                 }
3412
3413                 // Per-user custom styles
3414                 if ( $wgAllowUserCss ) {
3415                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3416                                 // We're on a preview of a CSS subpage
3417                                 // Exclude this page from the user module in case it's in there (bug 26283)
3418                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3419                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3420                                 );
3421
3422                                 // Load the previewed CSS
3423                                 // If needed, Janus it first. This is user-supplied CSS, so it's
3424                                 // assumed to be right for the content language directionality.
3425                                 $previewedCSS = $this->getRequest()->getText( 'wpTextbox1' );
3426                                 if ( $this->getLanguage()->getDir() !== $wgContLang->getDir() ) {
3427                                         $previewedCSS = CSSJanus::transform( $previewedCSS, true, false );
3428                                 }
3429                                 $otherTags .= Html::inlineStyle( $previewedCSS );
3430                         } else {
3431                                 // Load the user styles normally
3432                                 $moduleStyles[] = 'user';
3433                         }
3434                 }
3435
3436                 // Per-user preference styles
3437                 if ( $wgAllowUserCssPrefs ) {
3438                         $moduleStyles[] = 'user.cssprefs';
3439                 }
3440
3441                 foreach ( $moduleStyles as $name ) {
3442                         $module = $resourceLoader->getModule( $name );
3443                         if ( !$module ) {
3444                                 continue;
3445                         }
3446                         $group = $module->getGroup();
3447                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3448                         // will be placed in the "other" group
3449                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3450                 }
3451
3452                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3453                 // dynamically added styles to override statically added styles from other modules. So the order
3454                 // has to be other, dynamic, site, private, user
3455                 // Add statically added styles for other modules
3456                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3457                 // Add normal styles added through addStyle()/addInlineStyle() here
3458                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3459                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3460                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3461                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3462
3463                 // Add site, private and user styles
3464                 // 'private' at present only contains user.options, so put that before 'user'
3465                 // Any future private modules will likely have a similar user-specific character
3466                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3467                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3468                                         ResourceLoaderModule::TYPE_STYLES
3469                         );
3470                 }
3471
3472                 // Add stuff in $otherTags (previewed user CSS if applicable)
3473                 $ret .= $otherTags;
3474                 return $ret;
3475         }
3476
3477         /**
3478          * @return Array
3479          */
3480         public function buildCssLinksArray() {
3481                 $links = array();
3482
3483                 // Add any extension CSS
3484                 foreach ( $this->mExtStyles as $url ) {
3485                         $this->addStyle( $url );
3486                 }
3487                 $this->mExtStyles = array();
3488
3489                 foreach ( $this->styles as $file => $options ) {
3490                         $link = $this->styleLink( $file, $options );
3491                         if ( $link ) {
3492                                 $links[$file] = $link;
3493                         }
3494                 }
3495                 return $links;
3496         }
3497
3498         /**
3499          * Generate \<link\> tags for stylesheets
3500          *
3501          * @param string $style URL to the file
3502          * @param array $options option, can contain 'condition', 'dir', 'media'
3503          *                 keys
3504          * @return String: HTML fragment
3505          */
3506         protected function styleLink( $style, $options ) {
3507                 if ( isset( $options['dir'] ) ) {
3508                         if ( $this->getLanguage()->getDir() != $options['dir'] ) {
3509                                 return '';
3510                         }
3511                 }
3512
3513                 if ( isset( $options['media'] ) ) {
3514                         $media = self::transformCssMedia( $options['media'] );
3515                         if ( is_null( $media ) ) {
3516                                 return '';
3517                         }
3518                 } else {
3519                         $media = 'all';
3520                 }
3521
3522                 if ( substr( $style, 0, 1 ) == '/' ||
3523                         substr( $style, 0, 5 ) == 'http:' ||
3524                         substr( $style, 0, 6 ) == 'https:' ) {
3525                         $url = $style;
3526                 } else {
3527                         global $wgStylePath, $wgStyleVersion;
3528                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3529                 }
3530
3531                 $link = Html::linkedStyle( $url, $media );
3532
3533                 if ( isset( $options['condition'] ) ) {
3534                         $condition = htmlspecialchars( $options['condition'] );
3535                         $link = "<!--[if $condition]>$link<![endif]-->";
3536                 }
3537                 return $link;
3538         }
3539
3540         /**
3541          * Transform "media" attribute based on request parameters
3542          *
3543          * @param string $media current value of the "media" attribute
3544          * @return String: modified value of the "media" attribute, or null to skip
3545          * this stylesheet
3546          */
3547         public static function transformCssMedia( $media ) {
3548                 global $wgRequest;
3549
3550                 // http://www.w3.org/TR/css3-mediaqueries/#syntax
3551                 $screenMediaQueryRegex = '/^(?:only\s+)?screen\b/i';
3552
3553                 // Switch in on-screen display for media testing
3554                 $switches = array(
3555                         'printable' => 'print',
3556                         'handheld' => 'handheld',
3557                 );
3558                 foreach ( $switches as $switch => $targetMedia ) {
3559                         if ( $wgRequest->getBool( $switch ) ) {
3560                                 if ( $media == $targetMedia ) {
3561                                         $media = '';
3562                                 } elseif ( preg_match( $screenMediaQueryRegex, $media ) === 1 ) {
3563                                         // This regex will not attempt to understand a comma-separated media_query_list
3564                                         //
3565                                         // Example supported values for $media: 'screen', 'only screen', 'screen and (min-width: 982px)' ),
3566                                         // Example NOT supported value for $media: '3d-glasses, screen, print and resolution > 90dpi'
3567                                         //
3568                                         // If it's a print request, we never want any kind of screen stylesheets
3569                                         // If it's a handheld request (currently the only other choice with a switch),
3570                                         // we don't want simple 'screen' but we might want screen queries that
3571                                         // have a max-width or something, so we'll pass all others on and let the
3572                                         // client do the query.
3573                                         if ( $targetMedia == 'print' || $media == 'screen' ) {
3574                                                 return null;
3575                                         }
3576                                 }
3577                         }
3578                 }
3579
3580                 return $media;
3581         }
3582
3583         /**
3584          * Add a wikitext-formatted message to the output.
3585          * This is equivalent to:
3586          *
3587          *    $wgOut->addWikiText( wfMessage( ... )->plain() )
3588          */
3589         public function addWikiMsg( /*...*/ ) {
3590                 $args = func_get_args();
3591                 $name = array_shift( $args );
3592                 $this->addWikiMsgArray( $name, $args );
3593         }
3594
3595         /**
3596          * Add a wikitext-formatted message to the output.
3597          * Like addWikiMsg() except the parameters are taken as an array
3598          * instead of a variable argument list.
3599          *
3600          * @param $name string
3601          * @param $args array
3602          */
3603         public function addWikiMsgArray( $name, $args ) {
3604                 $this->addHTML( $this->msg( $name, $args )->parseAsBlock() );
3605         }
3606
3607         /**
3608          * This function takes a number of message/argument specifications, wraps them in
3609          * some overall structure, and then parses the result and adds it to the output.
3610          *
3611          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3612          * on. The subsequent arguments may either be strings, in which case they are the
3613          * message names, or arrays, in which case the first element is the message name,
3614          * and subsequent elements are the parameters to that message.
3615          *
3616          * Don't use this for messages that are not in users interface language.
3617          *
3618          * For example:
3619          *
3620          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3621          *
3622          * Is equivalent to:
3623          *
3624          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMessage( 'some-error' )->plain() . "\n</div>" );
3625          *
3626          * The newline after opening div is needed in some wikitext. See bug 19226.
3627          *
3628          * @param $wrap string
3629          */
3630         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3631                 $msgSpecs = func_get_args();
3632                 array_shift( $msgSpecs );
3633                 $msgSpecs = array_values( $msgSpecs );
3634                 $s = $wrap;
3635                 foreach ( $msgSpecs as $n => $spec ) {
3636                         if ( is_array( $spec ) ) {
3637                                 $args = $spec;
3638                                 $name = array_shift( $args );
3639                                 if ( isset( $args['options'] ) ) {
3640                                         unset( $args['options'] );
3641                                         wfDeprecated(
3642                                                 'Adding "options" to ' . __METHOD__ . ' is no longer supported',
3643                                                 '1.20'
3644                                         );
3645                                 }
3646                         } else {
3647                                 $args = array();
3648                                 $name = $spec;
3649                         }
3650                         $s = str_replace( '$' . ( $n + 1 ), $this->msg( $name, $args )->plain(), $s );
3651                 }
3652                 $this->addWikiText( $s );
3653         }
3654
3655         /**
3656          * Include jQuery core. Use this to avoid loading it multiple times
3657          * before we get a usable script loader.
3658          *
3659          * @param array $modules list of jQuery modules which should be loaded
3660          * @return Array: the list of modules which were not loaded.
3661          * @since 1.16
3662          * @deprecated since 1.17
3663          */
3664         public function includeJQuery( $modules = array() ) {
3665                 return array();
3666         }
3667
3668         /**
3669          * Enables/disables TOC, doesn't override __NOTOC__
3670          * @param bool $flag
3671          * @since 1.22
3672          */
3673         public function enableTOC( $flag = true ) {
3674                 $this->mEnableTOC = $flag;
3675         }
3676
3677         /**
3678          * @return bool
3679          * @since 1.22
3680          */
3681         public function isTOCEnabled() {
3682                 return $this->mEnableTOC;
3683         }
3684
3685         /**
3686          * Enables/disables section edit links, doesn't override __NOEDITSECTION__
3687          * @param bool $flag
3688          * @since 1.23
3689          */
3690         public function enableSectionEditLinks( $flag = true ) {
3691                 $this->mEnableSectionEditLinks = $flag;
3692         }
3693
3694         /**
3695          * @return bool
3696          * @since 1.23
3697          */
3698         public function sectionEditLinksEnabled() {
3699                 return $this->mEnableSectionEditLinks;
3700         }
3701 }