includes/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   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  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class Article implements Page {
  37         /**@{{
  38          * @private
  39          */
  40
  41         /**
  42          * The context this Article is executed in
  43          * @var IContextSource $mContext
  44          */
  45         protected $mContext;
  46
  47         /**
  48          * The WikiPage object of this instance
  49          * @var WikiPage $mPage
  50          */
  51         protected $mPage;
  52
  53         /**
  54          * ParserOptions object for $wgUser articles
  55          * @var ParserOptions $mParserOptions
  56          */
  57         public $mParserOptions;
  58
  59         /**
  60          * Text of the revision we are working on
  61          * @var string $mContent
  62          */
  63         var $mContent;                    // !< #BC cruft
  64
  65         /**
  66          * Content of the revision we are working on
  67          * @var Content
  68          * @since 1.21
  69          */
  70         var $mContentObject;              // !<
  71
  72         /**
  73          * Is the content ($mContent) already loaded?
  74          * @var bool $mContentLoaded
  75          */
  76         var $mContentLoaded = false;      // !<
  77
  78         /**
  79          * The oldid of the article that is to be shown, 0 for the
  80          * current revision
  81          * @var int|null $mOldId
  82          */
  83         var $mOldId;                      // !<
  84
  85         /**
  86          * Title from which we were redirected here
  87          * @var Title $mRedirectedFrom
  88          */
  89         var $mRedirectedFrom = null;
  90
  91         /**
  92          * URL to redirect to or false if none
  93          * @var string|false $mRedirectUrl
  94          */
  95         var $mRedirectUrl = false;        // !<
  96
  97         /**
  98          * Revision ID of revision we are working on
  99          * @var int $mRevIdFetched
 100          */
 101         var $mRevIdFetched = 0;           // !<
 102
 103         /**
 104          * Revision we are working on
 105          * @var Revision $mRevision
 106          */
 107         var $mRevision = null;
 108
 109         /**
 110          * ParserOutput object
 111          * @var ParserOutput $mParserOutput
 112          */
 113         var $mParserOutput;
 114
 115         /**@}}*/
 116
 117         /**
 118          * Constructor and clear the article
 119          * @param $title Title Reference to a Title object.
 120          * @param $oldId Integer revision ID, null to fetch from request, zero for current
 121          */
 122         public function __construct( Title $title, $oldId = null ) {
 123                 $this->mOldId = $oldId;
 124                 $this->mPage = $this->newPage( $title );
 125         }
 126
 127         /**
 128          * @param $title Title
 129          * @return WikiPage
 130          */
 131         protected function newPage( Title $title ) {
 132                 return new WikiPage( $title );
 133         }
 134
 135         /**
 136          * Constructor from a page id
 137          * @param $id Int article ID to load
 138          * @return Article|null
 139          */
 140         public static function newFromID( $id ) {
 141                 $t = Title::newFromID( $id );
 142                 # @todo FIXME: Doesn't inherit right
 143                 return $t == null ? null : new self( $t );
 144                 # return $t == null ? null : new static( $t ); // PHP 5.3
 145         }
 146
 147         /**
 148          * Create an Article object of the appropriate class for the given page.
 149          *
 150          * @param $title Title
 151          * @param $context IContextSource
 152          * @return Article object
 153          */
 154         public static function newFromTitle( $title, IContextSource $context ) {
 155                 if ( NS_MEDIA == $title->getNamespace() ) {
 156                         // FIXME: where should this go?
 157                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 158                 }
 159
 160                 $page = null;
 161                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 162                 if ( !$page ) {
 163                         switch( $title->getNamespace() ) {
 164                                 case NS_FILE:
 165                                         $page = new ImagePage( $title );
 166                                         break;
 167                                 case NS_CATEGORY:
 168                                         $page = new CategoryPage( $title );
 169                                         break;
 170                                 default:
 171                                         $page = new Article( $title );
 172                         }
 173                 }
 174                 $page->setContext( $context );
 175
 176                 return $page;
 177         }
 178
 179         /**
 180          * Create an Article object of the appropriate class for the given page.
 181          *
 182          * @param $page WikiPage
 183          * @param $context IContextSource
 184          * @return Article object
 185          */
 186         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 187                 $article = self::newFromTitle( $page->getTitle(), $context );
 188                 $article->mPage = $page; // override to keep process cached vars
 189                 return $article;
 190         }
 191
 192         /**
 193          * Tell the page view functions that this view was redirected
 194          * from another page on the wiki.
 195          * @param $from Title object.
 196          */
 197         public function setRedirectedFrom( Title $from ) {
 198                 $this->mRedirectedFrom = $from;
 199         }
 200
 201         /**
 202          * Get the title object of the article
 203          *
 204          * @return Title object of this page
 205          */
 206         public function getTitle() {
 207                 return $this->mPage->getTitle();
 208         }
 209
 210         /**
 211          * Get the WikiPage object of this instance
 212          *
 213          * @since 1.19
 214          * @return WikiPage
 215          */
 216         public function getPage() {
 217                 return $this->mPage;
 218         }
 219
 220         /**
 221          * Clear the object
 222          */
 223         public function clear() {
 224                 $this->mContentLoaded = false;
 225
 226                 $this->mRedirectedFrom = null; # Title object if set
 227                 $this->mRevIdFetched = 0;
 228                 $this->mRedirectUrl = false;
 229
 230                 $this->mPage->clear();
 231         }
 232
 233         /**
 234          * Note that getContent/loadContent do not follow redirects anymore.
 235          * If you need to fetch redirectable content easily, try
 236          * the shortcut in WikiPage::getRedirectTarget()
 237          *
 238          * This function has side effects! Do not use this function if you
 239          * only want the real revision text if any.
 240          *
 241          * @deprecated in 1.21; use WikiPage::getContent() instead
 242          *
 243          * @return string Return the text of this revision
 244          */
 245         public function getContent() {
 246                 ContentHandler::deprecated( __METHOD__, '1.21' );
 247                 $content = $this->getContentObject();
 248                 return ContentHandler::getContentText( $content );
 249         }
 250
 251         /**
 252          * Returns a Content object representing the pages effective display content,
 253          * not necessarily the revision's content!
 254          *
 255          * Note that getContent/loadContent do not follow redirects anymore.
 256          * If you need to fetch redirectable content easily, try
 257          * the shortcut in WikiPage::getRedirectTarget()
 258          *
 259          * This function has side effects! Do not use this function if you
 260          * only want the real revision text if any.
 261          *
 262          * @return Content Return the content of this revision
 263          *
 264          * @since 1.21
 265          */
 266         protected function getContentObject() {
 267                 wfProfileIn( __METHOD__ );
 268
 269                 if ( $this->mPage->getID() === 0 ) {
 270                         # If this is a MediaWiki:x message, then load the messages
 271                         # and return the message value for x.
 272                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 273                                 $text = $this->getTitle()->getDefaultMessageText();
 274                                 if ( $text === false ) {
 275                                         $text = '';
 276                                 }
 277
 278                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 279                         } else {
 280                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 281                                 $content = new MessageContent( $message, null, 'parsemag' );
 282                         }
 283                 } else {
 284                         $this->fetchContentObject();
 285                         $content = $this->mContentObject;
 286                 }
 287
 288                 wfProfileOut( __METHOD__ );
 289                 return $content;
 290         }
 291
 292         /**
 293          * @return int The oldid of the article that is to be shown, 0 for the
 294          *             current revision
 295          */
 296         public function getOldID() {
 297                 if ( is_null( $this->mOldId ) ) {
 298                         $this->mOldId = $this->getOldIDFromRequest();
 299                 }
 300
 301                 return $this->mOldId;
 302         }
 303
 304         /**
 305          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 306          *
 307          * @return int The old id for the request
 308          */
 309         public function getOldIDFromRequest() {
 310                 $this->mRedirectUrl = false;
 311
 312                 $request = $this->getContext()->getRequest();
 313                 $oldid = $request->getIntOrNull( 'oldid' );
 314
 315                 if ( $oldid === null ) {
 316                         return 0;
 317                 }
 318
 319                 if ( $oldid !== 0 ) {
 320                         # Load the given revision and check whether the page is another one.
 321                         # In that case, update this instance to reflect the change.
 322                         if ( $oldid === $this->mPage->getLatest() ) {
 323                                 $this->mRevision = $this->mPage->getRevision();
 324                         } else {
 325                                 $this->mRevision = Revision::newFromId( $oldid );
 326                                 if ( $this->mRevision !== null ) {
 327                                         // Revision title doesn't match the page title given?
 328                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 329                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 330                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 331                                         }
 332                                 }
 333                         }
 334                 }
 335
 336                 if ( $request->getVal( 'direction' ) == 'next' ) {
 337                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 338                         if ( $nextid ) {
 339                                 $oldid = $nextid;
 340                                 $this->mRevision = null;
 341                         } else {
 342                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 343                         }
 344                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 345                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 346                         if ( $previd ) {
 347                                 $oldid = $previd;
 348                                 $this->mRevision = null;
 349                         }
 350                 }
 351
 352                 return $oldid;
 353         }
 354
 355         /**
 356          * Load the revision (including text) into this object
 357          *
 358          * @deprecated in 1.19; use fetchContent()
 359          */
 360         function loadContent() {
 361                 wfDeprecated( __METHOD__, '1.19' );
 362                 $this->fetchContent();
 363         }
 364
 365         /**
 366          * Get text of an article from database
 367          * Does *NOT* follow redirects.
 368          *
 369          * @protected
 370          * @note this is really internal functionality that should really NOT be used by other functions. For accessing
 371          *       article content, use the WikiPage class, especially WikiBase::getContent(). However, a lot of legacy code
 372          *       uses this method to retrieve page text from the database, so the function has to remain public for now.
 373          *
 374          * @return mixed string containing article contents, or false if null
 375          * @deprecated in 1.21, use WikiPage::getContent() instead
 376          */
 377         function fetchContent() { #BC cruft!
 378                 ContentHandler::deprecated( __METHOD__, '1.21' );
 379
 380                 if ( $this->mContentLoaded && $this->mContent ) {
 381                         return $this->mContent;
 382                 }
 383
 384                 wfProfileIn( __METHOD__ );
 385
 386                 $content = $this->fetchContentObject();
 387
 388                 $this->mContent = ContentHandler::getContentText( $content ); #@todo: get rid of mContent everywhere!
 389                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 390
 391                 wfProfileOut( __METHOD__ );
 392
 393                 return $this->mContent;
 394         }
 395
 396
 397         /**
 398          * Get text content object
 399          * Does *NOT* follow redirects.
 400          * TODO: when is this null?
 401          *
 402          * @note code that wants to retrieve page content from the database should use WikiPage::getContent().
 403          *
 404          * @return Content|null|boolean false
 405          *
 406          * @since 1.21
 407          */
 408         protected function fetchContentObject() {
 409                 if ( $this->mContentLoaded ) {
 410                         return $this->mContentObject;
 411                 }
 412
 413                 wfProfileIn( __METHOD__ );
 414
 415                 $this->mContentLoaded = true;
 416                 $this->mContent = null;
 417
 418                 $oldid = $this->getOldID();
 419
 420                 # Pre-fill content with error message so that if something
 421                 # fails we'll have something telling us what we intended.
 422                 //XXX: this isn't page content but a UI message. horrible.
 423                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 424
 425                 if ( $oldid ) {
 426                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 427                         if ( !$this->mRevision ) {
 428                                 $this->mRevision = Revision::newFromId( $oldid );
 429                                 if ( !$this->mRevision ) {
 430                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 431                                         wfProfileOut( __METHOD__ );
 432                                         return false;
 433                                 }
 434                         }
 435                 } else {
 436                         if ( !$this->mPage->getLatest() ) {
 437                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 438                                 wfProfileOut( __METHOD__ );
 439                                 return false;
 440                         }
 441
 442                         $this->mRevision = $this->mPage->getRevision();
 443
 444                         if ( !$this->mRevision ) {
 445                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 446                                 wfProfileOut( __METHOD__ );
 447                                 return false;
 448                         }
 449                 }
 450
 451                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 452                 // We should instead work with the Revision object when we need it...
 453                 $this->mContentObject = $this->mRevision->getContent( Revision::FOR_THIS_USER, $this->getContext()->getUser() ); // Loads if user is allowed
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455
 456                 wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 457
 458                 wfProfileOut( __METHOD__ );
 459
 460                 return $this->mContentObject;
 461         }
 462
 463         /**
 464          * No-op
 465          * @deprecated since 1.18
 466          */
 467         public function forUpdate() {
 468                 wfDeprecated( __METHOD__, '1.18' );
 469         }
 470
 471         /**
 472          * Returns true if the currently-referenced revision is the current edit
 473          * to this page (and it exists).
 474          * @return bool
 475          */
 476         public function isCurrent() {
 477                 # If no oldid, this is the current version.
 478                 if ( $this->getOldID() == 0 ) {
 479                         return true;
 480                 }
 481
 482                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 483         }
 484
 485         /**
 486          * Get the fetched Revision object depending on request parameters or null
 487          * on failure.
 488          *
 489          * @since 1.19
 490          * @return Revision|null
 491          */
 492         public function getRevisionFetched() {
 493                 $this->fetchContentObject();
 494
 495                 return $this->mRevision;
 496         }
 497
 498         /**
 499          * Use this to fetch the rev ID used on page views
 500          *
 501          * @return int revision ID of last article revision
 502          */
 503         public function getRevIdFetched() {
 504                 if ( $this->mRevIdFetched ) {
 505                         return $this->mRevIdFetched;
 506                 } else {
 507                         return $this->mPage->getLatest();
 508                 }
 509         }
 510
 511         /**
 512          * This is the default action of the index.php entry point: just view the
 513          * page of the given title.
 514          */
 515         public function view() {
 516                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 517
 518                 wfProfileIn( __METHOD__ );
 519
 520                 # Get variables from query string
 521                 # As side effect this will load the revision and update the title
 522                 # in a revision ID is passed in the request, so this should remain
 523                 # the first call of this method even if $oldid is used way below.
 524                 $oldid = $this->getOldID();
 525
 526                 $user = $this->getContext()->getUser();
 527                 # Another whitelist check in case getOldID() is altering the title
 528                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 529                 if ( count( $permErrors ) ) {
 530                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 531                         wfProfileOut( __METHOD__ );
 532                         throw new PermissionsError( 'read', $permErrors );
 533                 }
 534
 535                 $outputPage = $this->getContext()->getOutput();
 536                 # getOldID() may as well want us to redirect somewhere else
 537                 if ( $this->mRedirectUrl ) {
 538                         $outputPage->redirect( $this->mRedirectUrl );
 539                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 540                         wfProfileOut( __METHOD__ );
 541
 542                         return;
 543                 }
 544
 545                 # If we got diff in the query, we want to see a diff page instead of the article.
 546                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 547                         wfDebug( __METHOD__ . ": showing diff page\n" );
 548                         $this->showDiffPage();
 549                         wfProfileOut( __METHOD__ );
 550
 551                         return;
 552                 }
 553
 554                 # Set page title (may be overridden by DISPLAYTITLE)
 555                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 556
 557                 $outputPage->setArticleFlag( true );
 558                 # Allow frames by default
 559                 $outputPage->allowClickjacking();
 560
 561                 $parserCache = ParserCache::singleton();
 562
 563                 $parserOptions = $this->getParserOptions();
 564                 # Render printable version, use printable version cache
 565                 if ( $outputPage->isPrintable() ) {
 566                         $parserOptions->setIsPrintable( true );
 567                         $parserOptions->setEditSection( false );
 568                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 569                         $parserOptions->setEditSection( false );
 570                 }
 571
 572                 # Try client and file cache
 573                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 574                         if ( $wgUseETag ) {
 575                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 576                         }
 577
 578                         # Is it client cached?
 579                         if ( $outputPage->checkLastModified( $this->mPage->getTouched() ) ) {
 580                                 wfDebug( __METHOD__ . ": done 304\n" );
 581                                 wfProfileOut( __METHOD__ );
 582
 583                                 return;
 584                         # Try file cache
 585                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 586                                 wfDebug( __METHOD__ . ": done file cache\n" );
 587                                 # tell wgOut that output is taken care of
 588                                 $outputPage->disable();
 589                                 $this->mPage->doViewUpdates( $user );
 590                                 wfProfileOut( __METHOD__ );
 591
 592                                 return;
 593                         }
 594                 }
 595
 596                 # Should the parser cache be used?
 597                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 598                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 599                 if ( $user->getStubThreshold() ) {
 600                         wfIncrStats( 'pcache_miss_stub' );
 601                 }
 602
 603                 $this->showRedirectedFromHeader();
 604                 $this->showNamespaceHeader();
 605
 606                 # Iterate through the possible ways of constructing the output text.
 607                 # Keep going until $outputDone is set, or we run out of things to do.
 608                 $pass = 0;
 609                 $outputDone = false;
 610                 $this->mParserOutput = false;
 611
 612                 while ( !$outputDone && ++$pass ) {
 613                         switch( $pass ) {
 614                                 case 1:
 615                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 616                                         break;
 617                                 case 2:
 618                                         # Early abort if the page doesn't exist
 619                                         if ( !$this->mPage->exists() ) {
 620                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 621                                                 $this->showMissingArticle();
 622                                                 wfProfileOut( __METHOD__ );
 623                                                 return;
 624                                         }
 625
 626                                         # Try the parser cache
 627                                         if ( $useParserCache ) {
 628                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 629
 630                                                 if ( $this->mParserOutput !== false ) {
 631                                                         if ( $oldid ) {
 632                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 633                                                                 $this->setOldSubtitle( $oldid );
 634                                                         } else {
 635                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 636                                                         }
 637                                                         $outputPage->addParserOutput( $this->mParserOutput );
 638                                                         # Ensure that UI elements requiring revision ID have
 639                                                         # the correct version information.
 640                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 641                                                         # Preload timestamp to avoid a DB hit
 642                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 643                                                         if ( $cachedTimestamp !== null ) {
 644                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 645                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 646                                                         }
 647                                                         $outputDone = true;
 648                                                 }
 649                                         }
 650                                         break;
 651                                 case 3:
 652                                         # This will set $this->mRevision if needed
 653                                         $this->fetchContentObject();
 654
 655                                         # Are we looking at an old revision
 656                                         if ( $oldid && $this->mRevision ) {
 657                                                 $this->setOldSubtitle( $oldid );
 658
 659                                                 if ( !$this->showDeletedRevisionHeader() ) {
 660                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 661                                                         wfProfileOut( __METHOD__ );
 662                                                         return;
 663                                                 }
 664                                         }
 665
 666                                         # Ensure that UI elements requiring revision ID have
 667                                         # the correct version information.
 668                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 669                                         # Preload timestamp to avoid a DB hit
 670                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 671
 672                                         # Pages containing custom CSS or JavaScript get special treatment
 673                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 674                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 675                                                 $this->showCssOrJsPage();
 676                                                 $outputDone = true;
 677                                         } elseif( !wfRunHooks( 'ArticleContentViewCustom',
 678                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 679
 680                                                 # Allow extensions do their own custom view for certain pages
 681                                                 $outputDone = true;
 682                                         } elseif( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 683                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 684
 685                                                 # Allow extensions do their own custom view for certain pages
 686                                                 $outputDone = true;
 687                                         } else {
 688                                                 $content = $this->getContentObject();
 689                                                 $rt = $content ? $content->getRedirectChain() : null;
 690                                                 if ( $rt ) {
 691                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 692                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 693                                                         $outputPage->addHTML( $this->viewRedirect( $rt ) );
 694                                                         # Parse just to get categories, displaytitle, etc.
 695                                                         $this->mParserOutput = $content->getParserOutput( $this->getTitle(), $oldid, $parserOptions, false );
 696                                                         $outputPage->addParserOutputNoText( $this->mParserOutput );
 697                                                         $outputDone = true;
 698                                                 }
 699                                         }
 700                                         break;
 701                                 case 4:
 702                                         # Run the parse, protected by a pool counter
 703                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 704
 705                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 706                                                 $this->getRevIdFetched(), $useParserCache, $this->getContentObject() );
 707
 708                                         if ( !$poolArticleView->execute() ) {
 709                                                 $error = $poolArticleView->getError();
 710                                                 if ( $error ) {
 711                                                         $outputPage->clearHTML(); // for release() errors
 712                                                         $outputPage->enableClientCache( false );
 713                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 714
 715                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 716                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 717                                                 }
 718                                                 # Connection or timeout error
 719                                                 wfProfileOut( __METHOD__ );
 720                                                 return;
 721                                         }
 722
 723                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 724                                         $outputPage->addParserOutput( $this->mParserOutput );
 725
 726                                         # Don't cache a dirty ParserOutput object
 727                                         if ( $poolArticleView->getIsDirty() ) {
 728                                                 $outputPage->setSquidMaxage( 0 );
 729                                                 $outputPage->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
 730                                         }
 731
 732                                         $outputDone = true;
 733                                         break;
 734                                 # Should be unreachable, but just in case...
 735                                 default:
 736                                         break 2;
 737                         }
 738                 }
 739
 740                 # Get the ParserOutput actually *displayed* here.
 741                 # Note that $this->mParserOutput is the *current* version output.
 742                 $pOutput = ( $outputDone instanceof ParserOutput )
 743                         ? $outputDone // object fetched by hook
 744                         : $this->mParserOutput;
 745
 746                 # Adjust title for main page & pages with displaytitle
 747                 if ( $pOutput ) {
 748                         $this->adjustDisplayTitle( $pOutput );
 749                 }
 750
 751                 # For the main page, overwrite the <title> element with the con-
 752                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 753                 # that's not empty).
 754                 # This message always exists because it is in the i18n files
 755                 if ( $this->getTitle()->isMainPage() ) {
 756                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 757                         if ( !$msg->isDisabled() ) {
 758                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 759                         }
 760                 }
 761
 762                 # Check for any __NOINDEX__ tags on the page using $pOutput
 763                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 764                 $outputPage->setIndexPolicy( $policy['index'] );
 765                 $outputPage->setFollowPolicy( $policy['follow'] );
 766
 767                 $this->showViewFooter();
 768                 $this->mPage->doViewUpdates( $user );
 769
 770                 wfProfileOut( __METHOD__ );
 771         }
 772
 773         /**
 774          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 775          * @param $pOutput ParserOutput
 776          */
 777         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 778                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 779                 $titleText = $pOutput->getTitleText();
 780                 if ( strval( $titleText ) !== '' ) {
 781                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 782                 }
 783         }
 784
 785         /**
 786          * Show a diff page according to current request variables. For use within
 787          * Article::view() only, other callers should use the DifferenceEngine class.
 788          *
 789          * @todo: make protected
 790          */
 791         public function showDiffPage() {
 792                 $request = $this->getContext()->getRequest();
 793                 $user = $this->getContext()->getUser();
 794                 $diff = $request->getVal( 'diff' );
 795                 $rcid = $request->getVal( 'rcid' );
 796                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 797                 $purge = $request->getVal( 'action' ) == 'purge';
 798                 $unhide = $request->getInt( 'unhide' ) == 1;
 799                 $oldid = $this->getOldID();
 800
 801                 $rev = $this->getRevisionFetched();
 802
 803                 if ( !$rev ) {
 804                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 805                         $this->getContext()->getOutput()->addWikiMsg( 'difference-missing-revision', $oldid, 1 );
 806                         return;
 807                 }
 808
 809                 $contentHandler = $rev->getContentHandler();
 810                 $de = $contentHandler->createDifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 811
 812                 // DifferenceEngine directly fetched the revision:
 813                 $this->mRevIdFetched = $de->mNewid;
 814                 $de->showDiffPage( $diffOnly );
 815
 816                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 817                         # Run view updates for current revision only
 818                         $this->mPage->doViewUpdates( $user );
 819                 }
 820         }
 821
 822         /**
 823          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 824          * Article::view() only.
 825          *
 826          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 827          * page views.
 828          *
 829          * @param bool $showCacheHint whether to show a message telling the user to clear the browser cache (default: true).
 830          */
 831         protected function showCssOrJsPage( $showCacheHint = true ) {
 832                 $outputPage = $this->getContext()->getOutput();
 833
 834                 if ( $showCacheHint ) {
 835                         $dir = $this->getContext()->getLanguage()->getDir();
 836                         $lang = $this->getContext()->getLanguage()->getCode();
 837
 838                         $outputPage->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 839                                 'clearyourcache' );
 840                 }
 841
 842                 $this->fetchContentObject();
 843
 844                 if ( $this->mContentObject ) {
 845                         // Give hooks a chance to customise the output
 846                         if ( ContentHandler::runLegacyHooks( 'ShowRawCssJs', array( $this->mContentObject, $this->getTitle(), $outputPage ) ) ) {
 847                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 848                                 $outputPage->addHTML( $po->getText() );
 849                         }
 850                 }
 851         }
 852
 853         /**
 854          * Get the robot policy to be used for the current view
 855          * @param $action String the action= GET parameter
 856          * @param $pOutput ParserOutput
 857          * @return Array the policy that should be set
 858          * TODO: actions other than 'view'
 859          */
 860         public function getRobotPolicy( $action, $pOutput ) {
 861                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 862
 863                 $ns = $this->getTitle()->getNamespace();
 864
 865                 # Don't index user and user talk pages for blocked users (bug 11443)
 866                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 867                         $specificTarget = null;
 868                         $vagueTarget = null;
 869                         $titleText = $this->getTitle()->getText();
 870                         if ( IP::isValid( $titleText ) ) {
 871                                 $vagueTarget = $titleText;
 872                         } else {
 873                                 $specificTarget = $titleText;
 874                         }
 875                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 876                                 return array(
 877                                         'index'  => 'noindex',
 878                                         'follow' => 'nofollow'
 879                                 );
 880                         }
 881                 }
 882
 883                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 884                         # Non-articles (special pages etc), and old revisions
 885                         return array(
 886                                 'index'  => 'noindex',
 887                                 'follow' => 'nofollow'
 888                         );
 889                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 890                         # Discourage indexing of printable versions, but encourage following
 891                         return array(
 892                                 'index'  => 'noindex',
 893                                 'follow' => 'follow'
 894                         );
 895                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 896                         # For ?curid=x urls, disallow indexing
 897                         return array(
 898                                 'index'  => 'noindex',
 899                                 'follow' => 'follow'
 900                         );
 901                 }
 902
 903                 # Otherwise, construct the policy based on the various config variables.
 904                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 905
 906                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 907                         # Honour customised robot policies for this namespace
 908                         $policy = array_merge(
 909                                 $policy,
 910                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 911                         );
 912                 }
 913                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 914                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 915                         # a final sanity check that we have really got the parser output.
 916                         $policy = array_merge(
 917                                 $policy,
 918                                 array( 'index' => $pOutput->getIndexPolicy() )
 919                         );
 920                 }
 921
 922                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 923                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 924                         $policy = array_merge(
 925                                 $policy,
 926                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 927                         );
 928                 }
 929
 930                 return $policy;
 931         }
 932
 933         /**
 934          * Converts a String robot policy into an associative array, to allow
 935          * merging of several policies using array_merge().
 936          * @param $policy Mixed, returns empty array on null/false/'', transparent
 937          *            to already-converted arrays, converts String.
 938          * @return Array: 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 939          */
 940         public static function formatRobotPolicy( $policy ) {
 941                 if ( is_array( $policy ) ) {
 942                         return $policy;
 943                 } elseif ( !$policy ) {
 944                         return array();
 945                 }
 946
 947                 $policy = explode( ',', $policy );
 948                 $policy = array_map( 'trim', $policy );
 949
 950                 $arr = array();
 951                 foreach ( $policy as $var ) {
 952                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 953                                 $arr['index'] = $var;
 954                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 955                                 $arr['follow'] = $var;
 956                         }
 957                 }
 958
 959                 return $arr;
 960         }
 961
 962         /**
 963          * If this request is a redirect view, send "redirected from" subtitle to
 964          * the output. Returns true if the header was needed, false if this is not
 965          * a redirect view. Handles both local and remote redirects.
 966          *
 967          * @return boolean
 968          */
 969         public function showRedirectedFromHeader() {
 970                 global $wgRedirectSources;
 971                 $outputPage = $this->getContext()->getOutput();
 972
 973                 $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 974
 975                 if ( isset( $this->mRedirectedFrom ) ) {
 976                         // This is an internally redirected page view.
 977                         // We'll need a backlink to the source page for navigation.
 978                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 979                                 $redir = Linker::linkKnown(
 980                                         $this->mRedirectedFrom,
 981                                         null,
 982                                         array(),
 983                                         array( 'redirect' => 'no' )
 984                                 );
 985
 986                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 987
 988                                 // Set the fragment if one was specified in the redirect
 989                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 990                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 991                                         $outputPage->addInlineScript( "redirectToFragment(\"$fragment\");" );
 992                                 }
 993
 994                                 // Add a <link rel="canonical"> tag
 995                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 996
 997                                 // Tell the output object that the user arrived at this article through a redirect
 998                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 999
1000                                 return true;
1001                         }
1002                 } elseif ( $rdfrom ) {
1003                         // This is an externally redirected view, from some other wiki.
1004                         // If it was reported from a trusted site, supply a backlink.
1005                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1006                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1007                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
1008
1009                                 return true;
1010                         }
1011                 }
1012
1013                 return false;
1014         }
1015
1016         /**
1017          * Show a header specific to the namespace currently being viewed, like
1018          * [[MediaWiki:Talkpagetext]]. For Article::view().
1019          */
1020         public function showNamespaceHeader() {
1021                 if ( $this->getTitle()->isTalkPage() ) {
1022                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1023                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1024                         }
1025                 }
1026         }
1027
1028         /**
1029          * Show the footer section of an ordinary page view
1030          */
1031         public function showViewFooter() {
1032                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1033                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
1034                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1035                 }
1036
1037                 # If we have been passed an &rcid= parameter, we want to give the user a
1038                 # chance to mark this new article as patrolled.
1039                 $this->showPatrolFooter();
1040
1041                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
1042
1043         }
1044
1045         /**
1046          * If patrol is possible, output a patrol UI box. This is called from the
1047          * footer section of ordinary page views. If patrol is not possible or not
1048          * desired, does nothing.
1049          * Side effect: When the patrol link is build, this method will call
1050          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1051          */
1052         public function showPatrolFooter() {
1053                 $request = $this->getContext()->getRequest();
1054                 $outputPage = $this->getContext()->getOutput();
1055                 $user = $this->getContext()->getUser();
1056                 $rcid = $request->getVal( 'rcid' );
1057
1058                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol', $user ) ) {
1059                         return;
1060                 }
1061
1062                 $token = $user->getEditToken( $rcid );
1063
1064                 $outputPage->preventClickjacking();
1065                 $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1066
1067                 $link = Linker::linkKnown(
1068                         $this->getTitle(),
1069                         wfMessage( 'markaspatrolledtext' )->escaped(),
1070                         array(),
1071                         array(
1072                                 'action' => 'markpatrolled',
1073                                 'rcid' => $rcid,
1074                                 'token' => $token,
1075                         )
1076                 );
1077
1078                 $outputPage->addHTML(
1079                         "<div class='patrollink'>" .
1080                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1081                         '</div>'
1082                 );
1083         }
1084
1085         /**
1086          * Show the error text for a missing article. For articles in the MediaWiki
1087          * namespace, show the default message text. To be called from Article::view().
1088          */
1089         public function showMissingArticle() {
1090                 global $wgSend404Code;
1091                 $outputPage = $this->getContext()->getOutput();
1092                 $validUserPage = false;
1093
1094                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1095                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
1096                         $parts = explode( '/', $this->getTitle()->getText() );
1097                         $rootPart = $parts[0];
1098                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1099                         $ip = User::isIP( $rootPart );
1100
1101                         if ( !($user && $user->isLoggedIn()) && !$ip ) { # User does not exist
1102                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1103                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1104                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1105                                 LogEventsList::showLogExtract(
1106                                         $outputPage,
1107                                         'block',
1108                                         $user->getUserPage(),
1109                                         '',
1110                                         array(
1111                                                 'lim' => 1,
1112                                                 'showIfEmpty' => false,
1113                                                 'msgKey' => array(
1114                                                         'blocked-notice-logextract',
1115                                                         $user->getName() # Support GENDER in notice
1116                                                 )
1117                                         )
1118                                 );
1119                                 $validUserPage = true;
1120                         } else {
1121                                 $validUserPage = true;
1122                         }
1123                 }
1124
1125                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1126
1127                 # Show delete and move logs
1128                 LogEventsList::showLogExtract( $outputPage, array( 'delete', 'move' ), $this->getTitle(), '',
1129                         array( 'lim' => 10,
1130                                 'conds' => array( "log_action != 'revision'" ),
1131                                 'showIfEmpty' => false,
1132                                 'msgKey' => array( 'moveddeleted-notice' ) )
1133                 );
1134
1135                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1136                         // If there's no backing content, send a 404 Not Found
1137                         // for better machine handling of broken links.
1138                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1139                 }
1140
1141                 $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
1142
1143                 if ( ! $hookResult ) {
1144                         return;
1145                 }
1146
1147                 # Show error message
1148                 $oldid = $this->getOldID();
1149                 if ( $oldid ) {
1150                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1151                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
1152                         // Use the default message text
1153                         $text = $this->getTitle()->getDefaultMessageText();
1154                 } elseif ( $this->getTitle()->quickUserCan( 'create', $this->getContext()->getUser() )
1155                         && $this->getTitle()->quickUserCan( 'edit', $this->getContext()->getUser() )
1156                 ) {
1157                         $text = wfMessage( 'noarticletext' )->plain();
1158                 } else {
1159                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1160                 }
1161                 $text = "<div class='noarticletext'>\n$text\n</div>";
1162
1163                 $outputPage->addWikiText( $text );
1164         }
1165
1166         /**
1167          * If the revision requested for view is deleted, check permissions.
1168          * Send either an error message or a warning header to the output.
1169          *
1170          * @return boolean true if the view is allowed, false if not.
1171          */
1172         public function showDeletedRevisionHeader() {
1173                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1174                         // Not deleted
1175                         return true;
1176                 }
1177
1178                 $outputPage = $this->getContext()->getOutput();
1179                 $user = $this->getContext()->getUser();
1180                 // If the user is not allowed to see it...
1181                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1182                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1183                                 'rev-deleted-text-permission' );
1184
1185                         return false;
1186                 // If the user needs to confirm that they want to see it...
1187                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1188                         # Give explanation and add a link to view the revision...
1189                         $oldid = intval( $this->getOldID() );
1190                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
1191                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1192                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1193                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1194                                 array( $msg, $link ) );
1195
1196                         return false;
1197                 // We are allowed to see...
1198                 } else {
1199                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1200                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1201                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1202
1203                         return true;
1204                 }
1205         }
1206
1207         /**
1208          * Generate the navigation links when browsing through an article revisions
1209          * It shows the information as:
1210          *   Revision as of \<date\>; view current revision
1211          *   \<- Previous version | Next Version -\>
1212          *
1213          * @param $oldid int: revision ID of this article revision
1214          */
1215         public function setOldSubtitle( $oldid = 0 ) {
1216                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1217                         return;
1218                 }
1219
1220                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1221
1222                 # Cascade unhide param in links for easy deletion browsing
1223                 $extraParams = array();
1224                 if ( $unhide ) {
1225                         $extraParams['unhide'] = 1;
1226                 }
1227
1228                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1229                         $revision = $this->mRevision;
1230                 } else {
1231                         $revision = Revision::newFromId( $oldid );
1232                 }
1233
1234                 $timestamp = $revision->getTimestamp();
1235
1236                 $current = ( $oldid == $this->mPage->getLatest() );
1237                 $language = $this->getContext()->getLanguage();
1238                 $user = $this->getContext()->getUser();
1239
1240                 $td = $language->userTimeAndDate( $timestamp, $user );
1241                 $tddate = $language->userDate( $timestamp, $user );
1242                 $tdtime = $language->userTime( $timestamp, $user );
1243
1244                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1245                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1246
1247                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1248                         ? 'revision-info-current'
1249                         : 'revision-info';
1250
1251                 $outputPage = $this->getContext()->getOutput();
1252                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1253                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1254                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1255
1256                 $lnk = $current
1257                         ? wfMessage( 'currentrevisionlink' )->escaped()
1258                         : Linker::linkKnown(
1259                                 $this->getTitle(),
1260                                 wfMessage( 'currentrevisionlink' )->escaped(),
1261                                 array(),
1262                                 $extraParams
1263                         );
1264                 $curdiff = $current
1265                         ? wfMessage( 'diff' )->escaped()
1266                         : Linker::linkKnown(
1267                                 $this->getTitle(),
1268                                 wfMessage( 'diff' )->escaped(),
1269                                 array(),
1270                                 array(
1271                                         'diff' => 'cur',
1272                                         'oldid' => $oldid
1273                                 ) + $extraParams
1274                         );
1275                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1276                 $prevlink = $prev
1277                         ? Linker::linkKnown(
1278                                 $this->getTitle(),
1279                                 wfMessage( 'previousrevision' )->escaped(),
1280                                 array(),
1281                                 array(
1282                                         'direction' => 'prev',
1283                                         'oldid' => $oldid
1284                                 ) + $extraParams
1285                         )
1286                         : wfMessage( 'previousrevision' )->escaped();
1287                 $prevdiff = $prev
1288                         ? Linker::linkKnown(
1289                                 $this->getTitle(),
1290                                 wfMessage( 'diff' )->escaped(),
1291                                 array(),
1292                                 array(
1293                                         'diff' => 'prev',
1294                                         'oldid' => $oldid
1295                                 ) + $extraParams
1296                         )
1297                         : wfMessage( 'diff' )->escaped();
1298                 $nextlink = $current
1299                         ? wfMessage( 'nextrevision' )->escaped()
1300                         : Linker::linkKnown(
1301                                 $this->getTitle(),
1302                                 wfMessage( 'nextrevision' )->escaped(),
1303                                 array(),
1304                                 array(
1305                                         'direction' => 'next',
1306                                         'oldid' => $oldid
1307                                 ) + $extraParams
1308                         );
1309                 $nextdiff = $current
1310                         ? wfMessage( 'diff' )->escaped()
1311                         : Linker::linkKnown(
1312                                 $this->getTitle(),
1313                                 wfMessage( 'diff' )->escaped(),
1314                                 array(),
1315                                 array(
1316                                         'diff' => 'next',
1317                                         'oldid' => $oldid
1318                                 ) + $extraParams
1319                         );
1320
1321                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1322                 if ( $cdel !== '' ) {
1323                         $cdel .= ' ';
1324                 }
1325
1326                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1327                         wfMessage( 'revision-nav' )->rawParams(
1328                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1329                         )->escaped() . "</div>" );
1330         }
1331
1332         /**
1333          * View redirect
1334          *
1335          * @param $target Title|Array of destination(s) to redirect
1336          * @param $appendSubtitle Boolean [optional]
1337          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1338          * @return string containing HMTL with redirect link
1339          */
1340         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1341                 global $wgStylePath;
1342
1343                 if ( !is_array( $target ) ) {
1344                         $target = array( $target );
1345                 }
1346
1347                 $lang = $this->getTitle()->getPageLanguage();
1348                 $imageDir = $lang->getDir();
1349
1350                 if ( $appendSubtitle ) {
1351                         $out = $this->getContext()->getOutput();
1352                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->escaped() );
1353                 }
1354
1355                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1356
1357                 /**
1358                  * @var $title Title
1359                  */
1360                 $title = array_shift( $target );
1361
1362                 if ( $forceKnown ) {
1363                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1364                 } else {
1365                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1366                 }
1367
1368                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1369                 $alt = $lang->isRTL() ? '←' : '→';
1370                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1371                 foreach ( $target as $rt ) {
1372                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1373                         if ( $forceKnown ) {
1374                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1375                         } else {
1376                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1377                         }
1378                 }
1379
1380                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1381                 return '<div class="redirectMsg">' .
1382                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1383                         '<span class="redirectText">' . $link . '</span></div>';
1384         }
1385
1386         /**
1387          * Handle action=render
1388          */
1389         public function render() {
1390                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1391                 $this->view();
1392         }
1393
1394         /**
1395          * action=protect handler
1396          */
1397         public function protect() {
1398                 $form = new ProtectionForm( $this );
1399                 $form->execute();
1400         }
1401
1402         /**
1403          * action=unprotect handler (alias)
1404          */
1405         public function unprotect() {
1406                 $this->protect();
1407         }
1408
1409         /**
1410          * UI entry point for page deletion
1411          */
1412         public function delete() {
1413                 # This code desperately needs to be totally rewritten
1414
1415                 $title = $this->getTitle();
1416                 $user = $this->getContext()->getUser();
1417
1418                 # Check permissions
1419                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1420                 if ( count( $permission_errors ) ) {
1421                         throw new PermissionsError( 'delete', $permission_errors );
1422                 }
1423
1424                 # Read-only check...
1425                 if ( wfReadOnly() ) {
1426                         throw new ReadOnlyError;
1427                 }
1428
1429                 # Better double-check that it hasn't been deleted yet!
1430                 $this->mPage->loadPageData( 'fromdbmaster' );
1431                 if ( !$this->mPage->exists() ) {
1432                         $deleteLogPage = new LogPage( 'delete' );
1433                         $outputPage = $this->getContext()->getOutput();
1434                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1435                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1436                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1437                                 );
1438                         $outputPage->addHTML(
1439                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1440                         );
1441                         LogEventsList::showLogExtract(
1442                                 $outputPage,
1443                                 'delete',
1444                                 $title
1445                         );
1446
1447                         return;
1448                 }
1449
1450                 $request = $this->getContext()->getRequest();
1451                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1452                 $deleteReason = $request->getText( 'wpReason' );
1453
1454                 if ( $deleteReasonList == 'other' ) {
1455                         $reason = $deleteReason;
1456                 } elseif ( $deleteReason != '' ) {
1457                         // Entry from drop down menu + additional comment
1458                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1459                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1460                 } else {
1461                         $reason = $deleteReasonList;
1462                 }
1463
1464                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1465                         array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
1466                 {
1467                         # Flag to hide all contents of the archived revisions
1468                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1469
1470                         $this->doDelete( $reason, $suppress );
1471
1472                         if ( $user->isLoggedIn() && $request->getCheck( 'wpWatch' ) != $user->isWatched( $title ) ) {
1473                                 if ( $request->getCheck( 'wpWatch' ) ) {
1474                                         WatchAction::doWatch( $title, $user );
1475                                 } else {
1476                                         WatchAction::doUnwatch( $title, $user );
1477                                 }
1478                         }
1479
1480                         return;
1481                 }
1482
1483                 // Generate deletion reason
1484                 $hasHistory = false;
1485                 if ( !$reason ) {
1486                         try {
1487                                 $reason = $this->generateReason( $hasHistory );
1488                         } catch ( MWException $e ) {
1489                                 # if a page is horribly broken, we still want to be able to delete it. so be lenient about errors here.
1490                                 wfDebug( "Error while building auto delete summary: $e" );
1491                                 $reason = '';
1492                         }
1493                 }
1494
1495                 // If the page has a history, insert a warning
1496                 if ( $hasHistory ) {
1497                         $revisions = $this->mTitle->estimateRevisionCount();
1498                         // @todo FIXME: i18n issue/patchwork message
1499                         $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
1500                                 wfMessage( 'historywarning' )->numParams( $revisions )->parse() .
1501                                 wfMessage( 'word-separator' )->plain() . Linker::linkKnown( $title,
1502                                         wfMessage( 'history' )->escaped(),
1503                                         array( 'rel' => 'archives' ),
1504                                         array( 'action' => 'history' ) ) .
1505                                 '</strong>'
1506                         );
1507
1508                         if ( $this->mTitle->isBigDeletion() ) {
1509                                 global $wgDeleteRevisionsLimit;
1510                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1511                                         array( 'delete-warning-toobig', $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit ) ) );
1512                         }
1513                 }
1514
1515                 $this->confirmDelete( $reason );
1516         }
1517
1518         /**
1519          * Output deletion confirmation dialog
1520          * @todo FIXME: Move to another file?
1521          * @param $reason String: prefilled reason
1522          */
1523         public function confirmDelete( $reason ) {
1524                 wfDebug( "Article::confirmDelete\n" );
1525
1526                 $outputPage = $this->getContext()->getOutput();
1527                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1528                 $outputPage->addBacklinkSubtitle( $this->getTitle() );
1529                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1530                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1531
1532                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1533
1534                 $user = $this->getContext()->getUser();
1535
1536                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1537                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1538                                         <td></td>
1539                                         <td class='mw-input'><strong>" .
1540                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1541                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1542                                         "</strong></td>
1543                                 </tr>";
1544                 } else {
1545                         $suppress = '';
1546                 }
1547                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $this->getTitle() );
1548
1549                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1550                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1551                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1552                         Xml::tags( 'legend', null, wfMessage( 'delete-legend' )->escaped() ) .
1553                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1554                         "<tr id=\"wpDeleteReasonListRow\">
1555                                 <td class='mw-label'>" .
1556                                         Xml::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1557                                 "</td>
1558                                 <td class='mw-input'>" .
1559                                         Xml::listDropDown( 'wpDeleteReasonList',
1560                                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1561                                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(), '', 'wpReasonDropDown', 1 ) .
1562                                 "</td>
1563                         </tr>
1564                         <tr id=\"wpDeleteReasonRow\">
1565                                 <td class='mw-label'>" .
1566                                         Xml::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1567                                 "</td>
1568                                 <td class='mw-input'>" .
1569                                 Html::input( 'wpReason', $reason, 'text', array(
1570                                         'size' => '60',
1571                                         'maxlength' => '255',
1572                                         'tabindex' => '2',
1573                                         'id' => 'wpReason',
1574                                         'autofocus'
1575                                 ) ) .
1576                                 "</td>
1577                         </tr>";
1578
1579                 # Disallow watching if user is not logged in
1580                 if ( $user->isLoggedIn() ) {
1581                         $form .= "
1582                         <tr>
1583                                 <td></td>
1584                                 <td class='mw-input'>" .
1585                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1586                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1587                                 "</td>
1588                         </tr>";
1589                 }
1590
1591                 $form .= "
1592                         $suppress
1593                         <tr>
1594                                 <td></td>
1595                                 <td class='mw-submit'>" .
1596                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1597                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1598                                 "</td>
1599                         </tr>" .
1600                         Xml::closeElement( 'table' ) .
1601                         Xml::closeElement( 'fieldset' ) .
1602                         Html::hidden( 'wpEditToken', $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1603                         Xml::closeElement( 'form' );
1604
1605                         if ( $user->isAllowed( 'editinterface' ) ) {
1606                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1607                                 $link = Linker::link(
1608                                         $title,
1609                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1610                                         array(),
1611                                         array( 'action' => 'edit' )
1612                                 );
1613                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1614                         }
1615
1616                 $outputPage->addHTML( $form );
1617
1618                 $deleteLogPage = new LogPage( 'delete' );
1619                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1620                 LogEventsList::showLogExtract( $outputPage, 'delete',
1621                         $this->getTitle()
1622                 );
1623         }
1624
1625         /**
1626          * Perform a deletion and output success or failure messages
1627          * @param $reason
1628          * @param $suppress bool
1629          */
1630         public function doDelete( $reason, $suppress = false ) {
1631                 $error = '';
1632                 $outputPage = $this->getContext()->getOutput();
1633                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1634                 if ( $status->isGood() ) {
1635                         $deleted = $this->getTitle()->getPrefixedText();
1636
1637                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1638                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1639
1640                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1641
1642                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1643                         $outputPage->returnToMain( false );
1644                 } else {
1645                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1646                         if ( $error == '' ) {
1647                                 $outputPage->addWikiText(
1648                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1649                                 );
1650                                 $deleteLogPage = new LogPage( 'delete' );
1651                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1652
1653                                 LogEventsList::showLogExtract(
1654                                         $outputPage,
1655                                         'delete',
1656                                         $this->getTitle()
1657                                 );
1658                         } else {
1659                                 $outputPage->addHTML( $error );
1660                         }
1661                 }
1662         }
1663
1664         /* Caching functions */
1665
1666         /**
1667          * checkLastModified returns true if it has taken care of all
1668          * output to the client that is necessary for this request.
1669          * (that is, it has sent a cached version of the page)
1670          *
1671          * @return boolean true if cached version send, false otherwise
1672          */
1673         protected function tryFileCache() {
1674                 static $called = false;
1675
1676                 if ( $called ) {
1677                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1678                         return false;
1679                 }
1680
1681                 $called = true;
1682                 if ( $this->isFileCacheable() ) {
1683                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1684                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1685                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1686                                 $cache->loadFromFileCache( $this->getContext() );
1687                                 return true;
1688                         } else {
1689                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1690                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1691                         }
1692                 } else {
1693                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1694                 }
1695
1696                 return false;
1697         }
1698
1699         /**
1700          * Check if the page can be cached
1701          * @return bool
1702          */
1703         public function isFileCacheable() {
1704                 $cacheable = false;
1705
1706                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1707                         $cacheable = $this->mPage->getID()
1708                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1709                         // Extension may have reason to disable file caching on some pages.
1710                         if ( $cacheable ) {
1711                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1712                         }
1713                 }
1714
1715                 return $cacheable;
1716         }
1717
1718         /**#@-*/
1719
1720         /**
1721          * Lightweight method to get the parser output for a page, checking the parser cache
1722          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1723          * consider, so it's not appropriate to use there.
1724          *
1725          * @since 1.16 (r52326) for LiquidThreads
1726          *
1727          * @param $oldid mixed integer Revision ID or null
1728          * @param $user User The relevant user
1729          * @return ParserOutput or false if the given revsion ID is not found
1730          */
1731         public function getParserOutput( $oldid = null, User $user = null ) {
1732                 //XXX: bypasses mParserOptions and thus setParserOptions()
1733
1734                 if ( $user === null ) {
1735                         $parserOptions = $this->getParserOptions();
1736                 } else {
1737                         $parserOptions = $this->mPage->makeParserOptions( $user );
1738                 }
1739
1740                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1741         }
1742
1743         /**
1744          * Override the ParserOptions used to render the primary article wikitext.
1745          *
1746          * @param ParserOptions $options
1747          * @throws MWException if the parser options where already initialized.
1748          */
1749         public function setParserOptions( ParserOptions $options ) {
1750                 if ( $this->mParserOptions ) {
1751                         throw new MWException( "can't change parser options after they have already been set" );
1752                 }
1753
1754                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1755                 $this->mParserOptions = clone $options;
1756         }
1757
1758         /**
1759          * Get parser options suitable for rendering the primary article wikitext
1760          * @return ParserOptions
1761          */
1762         public function getParserOptions() {
1763                 if ( !$this->mParserOptions ) {
1764                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1765                 }
1766                 // Clone to allow modifications of the return value without affecting cache
1767                 return clone $this->mParserOptions;
1768         }
1769
1770         /**
1771          * Sets the context this Article is executed in
1772          *
1773          * @param $context IContextSource
1774          * @since 1.18
1775          */
1776         public function setContext( $context ) {
1777                 $this->mContext = $context;
1778         }
1779
1780         /**
1781          * Gets the context this Article is executed in
1782          *
1783          * @return IContextSource
1784          * @since 1.18
1785          */
1786         public function getContext() {
1787                 if ( $this->mContext instanceof IContextSource ) {
1788                         return $this->mContext;
1789                 } else {
1790                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1791                         return RequestContext::getMain();
1792                 }
1793         }
1794
1795         /**
1796          * Info about this page
1797          * @deprecated since 1.19
1798          */
1799         public function info() {
1800                 wfDeprecated( __METHOD__, '1.19' );
1801                 Action::factory( 'info', $this )->show();
1802         }
1803
1804         /**
1805          * Mark this particular edit/page as patrolled
1806          * @deprecated since 1.18
1807          */
1808         public function markpatrolled() {
1809                 wfDeprecated( __METHOD__, '1.18' );
1810                 Action::factory( 'markpatrolled', $this )->show();
1811         }
1812
1813         /**
1814          * Handle action=purge
1815          * @deprecated since 1.19
1816          * @return Action|bool|null false if the action is disabled, null if it is not recognised
1817          */
1818         public function purge() {
1819                 return Action::factory( 'purge', $this )->show();
1820         }
1821
1822         /**
1823          * Handle action=revert
1824          * @deprecated since 1.19
1825          */
1826         public function revert() {
1827                 wfDeprecated( __METHOD__, '1.19' );
1828                 Action::factory( 'revert', $this )->show();
1829         }
1830
1831         /**
1832          * Handle action=rollback
1833          * @deprecated since 1.19
1834          */
1835         public function rollback() {
1836                 wfDeprecated( __METHOD__, '1.19' );
1837                 Action::factory( 'rollback', $this )->show();
1838         }
1839
1840         /**
1841          * User-interface handler for the "watch" action.
1842          * Requires Request to pass a token as of 1.18.
1843          * @deprecated since 1.18
1844          */
1845         public function watch() {
1846                 wfDeprecated( __METHOD__, '1.18' );
1847                 Action::factory( 'watch', $this )->show();
1848         }
1849
1850         /**
1851          * Add this page to the current user's watchlist
1852          *
1853          * This is safe to be called multiple times
1854          *
1855          * @return bool true on successful watch operation
1856          * @deprecated since 1.18
1857          */
1858         public function doWatch() {
1859                 wfDeprecated( __METHOD__, '1.18' );
1860                 return WatchAction::doWatch( $this->getTitle(), $this->getContext()->getUser() );
1861         }
1862
1863         /**
1864          * User interface handler for the "unwatch" action.
1865          * Requires Request to pass a token as of 1.18.
1866          * @deprecated since 1.18
1867          */
1868         public function unwatch() {
1869                 wfDeprecated( __METHOD__, '1.18' );
1870                 Action::factory( 'unwatch', $this )->show();
1871         }
1872
1873         /**
1874          * Stop watching a page
1875          * @return bool true on successful unwatch
1876          * @deprecated since 1.18
1877          */
1878         public function doUnwatch() {
1879                 wfDeprecated( __METHOD__, '1.18' );
1880                 return WatchAction::doUnwatch( $this->getTitle(), $this->getContext()->getUser() );
1881         }
1882
1883         /**
1884          * Output a redirect back to the article.
1885          * This is typically used after an edit.
1886          *
1887          * @deprecated in 1.18; call OutputPage::redirect() directly
1888          * @param $noRedir Boolean: add redirect=no
1889          * @param $sectionAnchor String: section to redirect to, including "#"
1890          * @param $extraQuery String: extra query params
1891          */
1892         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1893                 wfDeprecated( __METHOD__, '1.18' );
1894                 if ( $noRedir ) {
1895                         $query = 'redirect=no';
1896                         if ( $extraQuery ) {
1897                                 $query .= "&$extraQuery";
1898                         }
1899                 } else {
1900                         $query = $extraQuery;
1901                 }
1902
1903                 $this->getContext()->getOutput()->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1904         }
1905
1906         /**
1907          * Use PHP's magic __get handler to handle accessing of
1908          * raw WikiPage fields for backwards compatibility.
1909          *
1910          * @param $fname String Field name
1911          */
1912         public function __get( $fname ) {
1913                 if ( property_exists( $this->mPage, $fname ) ) {
1914                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1915                         return $this->mPage->$fname;
1916                 }
1917                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1918         }
1919
1920         /**
1921          * Use PHP's magic __set handler to handle setting of
1922          * raw WikiPage fields for backwards compatibility.
1923          *
1924          * @param $fname String Field name
1925          * @param $fvalue mixed New value
1926          */
1927         public function __set( $fname, $fvalue ) {
1928                 if ( property_exists( $this->mPage, $fname ) ) {
1929                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1930                         $this->mPage->$fname = $fvalue;
1931                 // Note: extensions may want to toss on new fields
1932                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1933                         $this->mPage->$fname = $fvalue;
1934                 } else {
1935                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1936                 }
1937         }
1938
1939         /**
1940          * Use PHP's magic __call handler to transform instance calls to
1941          * WikiPage functions for backwards compatibility.
1942          *
1943          * @param $fname String Name of called method
1944          * @param $args Array Arguments to the method
1945          * @return mixed
1946          */
1947         public function __call( $fname, $args ) {
1948                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1949                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1950                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1951                 }
1952                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1953         }
1954
1955         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1956
1957         /**
1958          * @param $limit array
1959          * @param $expiry array
1960          * @param $cascade bool
1961          * @param $reason string
1962          * @param $user User
1963          * @return Status
1964          */
1965         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1966                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
1967         }
1968
1969         /**
1970          * @param $limit array
1971          * @param $reason string
1972          * @param $cascade int
1973          * @param $expiry array
1974          * @return bool
1975          */
1976         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1977                 return $this->mPage->doUpdateRestrictions(
1978                         $limit,
1979                         $expiry,
1980                         $cascade,
1981                         $reason,
1982                         $this->getContext()->getUser()
1983                 );
1984         }
1985
1986         /**
1987          * @param $reason string
1988          * @param $suppress bool
1989          * @param $id int
1990          * @param $commit bool
1991          * @param $error string
1992          * @return bool
1993          */
1994         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
1995                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
1996         }
1997
1998         /**
1999          * @param $fromP
2000          * @param $summary
2001          * @param $token
2002          * @param $bot
2003          * @param $resultDetails
2004          * @param $user User
2005          * @return array
2006          */
2007         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2008                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2009                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2010         }
2011
2012         /**
2013          * @param $fromP
2014          * @param $summary
2015          * @param $bot
2016          * @param $resultDetails
2017          * @param $guser User
2018          * @return array
2019          */
2020         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2021                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2022                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2023         }
2024
2025         /**
2026          * @param $hasHistory bool
2027          * @return mixed
2028          */
2029         public function generateReason( &$hasHistory ) {
2030                 $title = $this->mPage->getTitle();
2031                 $handler = ContentHandler::getForTitle( $title );
2032                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2033         }
2034
2035         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2036
2037         /**
2038          * @return array
2039          */
2040         public static function selectFields() {
2041                 return WikiPage::selectFields();
2042         }
2043
2044         /**
2045          * @param $title Title
2046          */
2047         public static function onArticleCreate( $title ) {
2048                 WikiPage::onArticleCreate( $title );
2049         }
2050
2051         /**
2052          * @param $title Title
2053          */
2054         public static function onArticleDelete( $title ) {
2055                 WikiPage::onArticleDelete( $title );
2056         }
2057
2058         /**
2059          * @param $title Title
2060          */
2061         public static function onArticleEdit( $title ) {
2062                 WikiPage::onArticleEdit( $title );
2063         }
2064
2065         /**
2066          * @param $oldtext
2067          * @param $newtext
2068          * @param $flags
2069          * @return string
2070          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2071          */
2072         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2073                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2074         }
2075         // ******
2076 }