includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class for viewing MediaWiki article and history.
   9  *
  10  * This maintains WikiPage functions for backwards compatibility.
  11  *
  12  * @TODO: move and rewrite code to an Action class
  13  *
  14  * See design.txt for an overview.
  15  * Note: edit user interface and cache support functions have been
  16  * moved to separate EditPage and HTMLFileCache classes.
  17  *
  18  * @internal documentation reviewed 15 Mar 2010
  19  */
  20 class Article extends Page {
  21         /**@{{
  22          * @private
  23          */
  24
  25         /**
  26          * @var IContextSource
  27          */
  28         protected $mContext;
  29
  30         /**
  31          * @var WikiPage
  32          */
  33         protected $mPage;
  34
  35         /**
  36          * @var ParserOptions: ParserOptions object for $wgUser articles
  37          */
  38         public $mParserOptions;
  39
  40         var $mContent;                    // !<
  41         var $mContentLoaded = false;      // !<
  42         var $mOldId;                      // !<
  43
  44         /**
  45          * @var Title
  46          */
  47         var $mRedirectedFrom = null;
  48
  49         /**
  50          * @var mixed: boolean false or URL string
  51          */
  52         var $mRedirectUrl = false;        // !<
  53         var $mRevIdFetched = 0;           // !<
  54
  55         /**
  56          * @var Revision
  57          */
  58         var $mRevision = null;
  59
  60         /**
  61          * @var ParserOutput
  62          */
  63         var $mParserOutput;
  64
  65         /**@}}*/
  66
  67         /**
  68          * Constructor and clear the article
  69          * @param $title Title Reference to a Title object.
  70          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  71          */
  72         public function __construct( Title $title, $oldId = null ) {
  73                 $this->mOldId = $oldId;
  74                 $this->mPage = $this->newPage( $title );
  75         }
  76
  77         /**
  78          * @param $title Title
  79          * @return WikiPage
  80          */
  81         protected function newPage( Title $title ) {
  82                 return new WikiPage( $title );
  83         }
  84
  85         /**
  86          * Constructor from a page id
  87          * @param $id Int article ID to load
  88          * @return Article|null
  89          */
  90         public static function newFromID( $id ) {
  91                 $t = Title::newFromID( $id );
  92                 # @todo FIXME: Doesn't inherit right
  93                 return $t == null ? null : new self( $t );
  94                 # return $t == null ? null : new static( $t ); // PHP 5.3
  95         }
  96
  97         /**
  98          * Create an Article object of the appropriate class for the given page.
  99          *
 100          * @param $title Title
 101          * @param $context IContextSource
 102          * @return Article object
 103          */
 104         public static function newFromTitle( $title, IContextSource $context ) {
 105                 if ( NS_MEDIA == $title->getNamespace() ) {
 106                         // FIXME: where should this go?
 107                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 108                 }
 109
 110                 $page = null;
 111                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 112                 if ( !$page ) {
 113                         switch( $title->getNamespace() ) {
 114                                 case NS_FILE:
 115                                         $page = new ImagePage( $title );
 116                                         break;
 117                                 case NS_CATEGORY:
 118                                         $page = new CategoryPage( $title );
 119                                         break;
 120                                 default:
 121                                         $page = new Article( $title );
 122                         }
 123                 }
 124                 $page->setContext( $context );
 125
 126                 return $page;
 127         }
 128
 129         /**
 130          * Create an Article object of the appropriate class for the given page.
 131          *
 132          * @param $page WikiPage
 133          * @param $context IContextSource
 134          * @return Article object
 135          */
 136         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 137                 $article = self::newFromTitle( $page->getTitle(), $context );
 138                 $article->mPage = $page; // override to keep process cached vars
 139                 return $article;
 140         }
 141
 142         /**
 143          * Tell the page view functions that this view was redirected
 144          * from another page on the wiki.
 145          * @param $from Title object.
 146          */
 147         public function setRedirectedFrom( Title $from ) {
 148                 $this->mRedirectedFrom = $from;
 149         }
 150
 151         /**
 152          * Get the title object of the article
 153          * @return Title object of this page
 154          */
 155         public function getTitle() {
 156                 return $this->mPage->getTitle();
 157         }
 158
 159         /**
 160          * Clear the object
 161          */
 162         public function clear() {
 163                 $this->mContentLoaded = false;
 164
 165                 $this->mRedirectedFrom = null; # Title object if set
 166                 $this->mRevIdFetched = 0;
 167                 $this->mRedirectUrl = false;
 168
 169                 $this->mPage->clear();
 170         }
 171
 172         /**
 173          * Note that getContent/loadContent do not follow redirects anymore.
 174          * If you need to fetch redirectable content easily, try
 175          * the shortcut in Article::followRedirect()
 176          *
 177          * This function has side effects! Do not use this function if you
 178          * only want the real revision text if any.
 179          *
 180          * @return Return the text of this revision
 181          */
 182         public function getContent() {
 183                 global $wgUser;
 184
 185                 wfProfileIn( __METHOD__ );
 186
 187                 if ( $this->mPage->getID() === 0 ) {
 188                         # If this is a MediaWiki:x message, then load the messages
 189                         # and return the message value for x.
 190                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 191                                 $text = $this->getTitle()->getDefaultMessageText();
 192                                 if ( $text === false ) {
 193                                         $text = '';
 194                                 }
 195                         } else {
 196                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 197                         }
 198                         wfProfileOut( __METHOD__ );
 199
 200                         return $text;
 201                 } else {
 202                         $this->fetchContent();
 203                         wfProfileOut( __METHOD__ );
 204
 205                         return $this->mContent;
 206                 }
 207         }
 208
 209         /**
 210          * @return int The oldid of the article that is to be shown, 0 for the
 211          *             current revision
 212          */
 213         public function getOldID() {
 214                 if ( is_null( $this->mOldId ) ) {
 215                         $this->mOldId = $this->getOldIDFromRequest();
 216                 }
 217
 218                 return $this->mOldId;
 219         }
 220
 221         /**
 222          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 223          *
 224          * @return int The old id for the request
 225          */
 226         public function getOldIDFromRequest() {
 227                 global $wgRequest;
 228
 229                 $this->mRedirectUrl = false;
 230
 231                 $oldid = $wgRequest->getIntOrNull( 'oldid' );
 232
 233                 if ( $oldid === null ) {
 234                         return 0;
 235                 }
 236
 237                 if ( $oldid !== 0 ) {
 238                         # Load the given revision and check whether the page is another one.
 239                         # In that case, update this instance to reflect the change.
 240                         $this->mRevision = Revision::newFromId( $oldid );
 241                         if ( $this->mRevision !== null ) {
 242                                 // Revision title doesn't match the page title given?
 243                                 if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 244                                         $function = array( get_class( $this->mPage ), 'newFromID' );
 245                                         $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 246                                 }
 247                         }
 248                 }
 249
 250                 if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 251                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 252                         if ( $nextid ) {
 253                                 $oldid = $nextid;
 254                         } else {
 255                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 256                         }
 257                 } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 258                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 259                         if ( $previd ) {
 260                                 $oldid = $previd;
 261                         }
 262                 }
 263
 264                 return $oldid;
 265         }
 266
 267         /**
 268          * Load the revision (including text) into this object
 269          *
 270          * @deprecated in 1.19; use fetchContent()
 271          */
 272         function loadContent() {
 273                 wfDeprecated( __METHOD__, '1.19' );
 274                 $this->fetchContent();
 275         }
 276
 277         /**
 278          * Get text of an article from database
 279          * Does *NOT* follow redirects.
 280          *
 281          * @return mixed string containing article contents, or false if null
 282          */
 283         function fetchContent() {
 284                 if ( $this->mContentLoaded ) {
 285                         return $this->mContent;
 286                 }
 287
 288                 wfProfileIn( __METHOD__ );
 289
 290                 $this->mContentLoaded = true;
 291
 292                 $oldid = $this->getOldID();
 293
 294                 # Pre-fill content with error message so that if something
 295                 # fails we'll have something telling us what we intended.
 296                 $t = $this->getTitle()->getPrefixedText();
 297                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 298                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 299
 300                 if ( $oldid ) {
 301                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 302                         if ( !$this->mRevision ) {
 303                                 $this->mRevision = Revision::newFromId( $oldid );
 304                                 if ( !$this->mRevision ) {
 305                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 306                                         wfProfileOut( __METHOD__ );
 307                                         return false;
 308                                 }
 309                         }
 310                 } else {
 311                         if ( !$this->mPage->getLatest() ) {
 312                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 313                                 wfProfileOut( __METHOD__ );
 314                                 return false;
 315                         }
 316
 317                         $this->mRevision = $this->mPage->getRevision();
 318                         if ( !$this->mRevision ) {
 319                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 320                                 wfProfileOut( __METHOD__ );
 321                                 return false;
 322                         }
 323                 }
 324
 325                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 326                 // We should instead work with the Revision object when we need it...
 327                 $this->mContent = $this->mRevision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 328                 $this->mRevIdFetched = $this->mRevision->getId();
 329
 330                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 331
 332                 wfProfileOut( __METHOD__ );
 333
 334                 return $this->mContent;
 335         }
 336
 337         /**
 338          * No-op
 339          * @deprecated since 1.18
 340          */
 341         public function forUpdate() {
 342                 wfDeprecated( __METHOD__, '1.18' );
 343         }
 344
 345         /**
 346          * Returns true if the currently-referenced revision is the current edit
 347          * to this page (and it exists).
 348          * @return bool
 349          */
 350         public function isCurrent() {
 351                 # If no oldid, this is the current version.
 352                 if ( $this->getOldID() == 0 ) {
 353                         return true;
 354                 }
 355
 356                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 357         }
 358
 359         /**
 360          * Get the fetched Revision object depending on request parameters or null
 361          * on failure.
 362          *
 363          * @since 1.19
 364          * @return Revision|null
 365          */
 366         public function getRevisionFetched() {
 367                 $this->fetchContent();
 368
 369                 return $this->mRevision;
 370         }
 371
 372         /**
 373          * Use this to fetch the rev ID used on page views
 374          *
 375          * @return int revision ID of last article revision
 376          */
 377         public function getRevIdFetched() {
 378                 if ( $this->mRevIdFetched ) {
 379                         return $this->mRevIdFetched;
 380                 } else {
 381                         return $this->mPage->getLatest();
 382                 }
 383         }
 384
 385         /**
 386          * This is the default action of the index.php entry point: just view the
 387          * page of the given title.
 388          */
 389         public function view() {
 390                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 391                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 392
 393                 wfProfileIn( __METHOD__ );
 394
 395                 # Get variables from query string
 396                 # As side effect this will load the revision and update the title
 397                 # in a revision ID is passed in the request, so this should remain
 398                 # the first call of this method even if $oldid is used way below.
 399                 $oldid = $this->getOldID();
 400
 401                 # Another whitelist check in case getOldID() is altering the title
 402                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $wgUser );
 403                 if ( count( $permErrors ) ) {
 404                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 405                         wfProfileOut( __METHOD__ );
 406                         throw new PermissionsError( 'read', $permErrors );
 407                 }
 408
 409                 # getOldID() may as well want us to redirect somewhere else
 410                 if ( $this->mRedirectUrl ) {
 411                         $wgOut->redirect( $this->mRedirectUrl );
 412                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 413                         wfProfileOut( __METHOD__ );
 414
 415                         return;
 416                 }
 417
 418                 # If we got diff in the query, we want to see a diff page instead of the article.
 419                 if ( $wgRequest->getCheck( 'diff' ) ) {
 420                         wfDebug( __METHOD__ . ": showing diff page\n" );
 421                         $this->showDiffPage();
 422                         wfProfileOut( __METHOD__ );
 423
 424                         return;
 425                 }
 426
 427                 # Set page title (may be overridden by DISPLAYTITLE)
 428                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 429
 430                 $wgOut->setArticleFlag( true );
 431                 # Allow frames by default
 432                 $wgOut->allowClickjacking();
 433
 434                 $parserCache = ParserCache::singleton();
 435
 436                 $parserOptions = $this->getParserOptions();
 437                 # Render printable version, use printable version cache
 438                 if ( $wgOut->isPrintable() ) {
 439                         $parserOptions->setIsPrintable( true );
 440                         $parserOptions->setEditSection( false );
 441                 } elseif ( !$this->getTitle()->quickUserCan( 'edit' ) ) {
 442                         $parserOptions->setEditSection( false );
 443                 }
 444
 445                 # Try client and file cache
 446                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 447                         if ( $wgUseETag ) {
 448                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 449                         }
 450
 451                         # Is it client cached?
 452                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 453                                 wfDebug( __METHOD__ . ": done 304\n" );
 454                                 wfProfileOut( __METHOD__ );
 455
 456                                 return;
 457                         # Try file cache
 458                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 459                                 wfDebug( __METHOD__ . ": done file cache\n" );
 460                                 # tell wgOut that output is taken care of
 461                                 $wgOut->disable();
 462                                 $this->mPage->doViewUpdates( $wgUser );
 463                                 wfProfileOut( __METHOD__ );
 464
 465                                 return;
 466                         }
 467                 }
 468
 469                 # Should the parser cache be used?
 470                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 471                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 472                 if ( $wgUser->getStubThreshold() ) {
 473                         wfIncrStats( 'pcache_miss_stub' );
 474                 }
 475
 476                 $this->showRedirectedFromHeader();
 477                 $this->showNamespaceHeader();
 478
 479                 # Iterate through the possible ways of constructing the output text.
 480                 # Keep going until $outputDone is set, or we run out of things to do.
 481                 $pass = 0;
 482                 $outputDone = false;
 483                 $this->mParserOutput = false;
 484
 485                 while ( !$outputDone && ++$pass ) {
 486                         switch( $pass ) {
 487                                 case 1:
 488                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 489                                         break;
 490                                 case 2:
 491                                         # Early abort if the page doesn't exist
 492                                         if ( !$this->mPage->exists() ) {
 493                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 494                                                 $this->showMissingArticle();
 495                                                 wfProfileOut( __METHOD__ );
 496                                                 return;
 497                                         }
 498
 499                                         # Try the parser cache
 500                                         if ( $useParserCache ) {
 501                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 502
 503                                                 if ( $this->mParserOutput !== false ) {
 504                                                         if ( $oldid ) {
 505                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 506                                                                 $this->setOldSubtitle( $oldid );
 507                                                         } else {
 508                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 509                                                         }
 510                                                         $wgOut->addParserOutput( $this->mParserOutput );
 511                                                         # Ensure that UI elements requiring revision ID have
 512                                                         # the correct version information.
 513                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 514                                                         # Preload timestamp to avoid a DB hit
 515                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 516                                                         if ( $cachedTimestamp !== null ) {
 517                                                                 $wgOut->setRevisionTimestamp( $cachedTimestamp );
 518                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 519                                                         }
 520                                                         $outputDone = true;
 521                                                 }
 522                                         }
 523                                         break;
 524                                 case 3:
 525                                         # This will set $this->mRevision if needed
 526                                         $this->fetchContent();
 527
 528                                         # Are we looking at an old revision
 529                                         if ( $oldid && $this->mRevision ) {
 530                                                 $this->setOldSubtitle( $oldid );
 531
 532                                                 if ( !$this->showDeletedRevisionHeader() ) {
 533                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 534                                                         wfProfileOut( __METHOD__ );
 535                                                         return;
 536                                                 }
 537                                         }
 538
 539                                         # Ensure that UI elements requiring revision ID have
 540                                         # the correct version information.
 541                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 542                                         # Preload timestamp to avoid a DB hit
 543                                         $wgOut->setRevisionTimestamp( $this->getTimestamp() );
 544
 545                                         # Pages containing custom CSS or JavaScript get special treatment
 546                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 547                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 548                                                 $this->showCssOrJsPage();
 549                                                 $outputDone = true;
 550                                         } elseif( !wfRunHooks( 'ArticleViewCustom', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 551                                                 # Allow extensions do their own custom view for certain pages
 552                                                 $outputDone = true;
 553                                         } else {
 554                                                 $text = $this->getContent();
 555                                                 $rt = Title::newFromRedirectArray( $text );
 556                                                 if ( $rt ) {
 557                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 558                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 559                                                         $wgOut->addHTML( $this->viewRedirect( $rt ) );
 560                                                         # Parse just to get categories, displaytitle, etc.
 561                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 562                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 563                                                         $outputDone = true;
 564                                                 }
 565                                         }
 566                                         break;
 567                                 case 4:
 568                                         # Run the parse, protected by a pool counter
 569                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 570
 571                                         $poolArticleView = new PoolWorkArticleView( $this, $parserOptions,
 572                                                 $this->getRevIdFetched(), $useParserCache, $this->getContent() );
 573
 574                                         if ( !$poolArticleView->execute() ) {
 575                                                 $error = $poolArticleView->getError();
 576                                                 if ( $error ) {
 577                                                         $wgOut->clearHTML(); // for release() errors
 578                                                         $wgOut->enableClientCache( false );
 579                                                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 580
 581                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 582                                                         $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 583                                                 }
 584                                                 # Connection or timeout error
 585                                                 wfProfileOut( __METHOD__ );
 586                                                 return;
 587                                         }
 588
 589                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 590                                         $wgOut->addParserOutput( $this->mParserOutput );
 591
 592                                         # Don't cache a dirty ParserOutput object
 593                                         if ( $poolArticleView->getIsDirty() ) {
 594                                                 $wgOut->setSquidMaxage( 0 );
 595                                                 $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
 596                                         }
 597
 598                                         $outputDone = true;
 599                                         break;
 600                                 # Should be unreachable, but just in case...
 601                                 default:
 602                                         break 2;
 603                         }
 604                 }
 605
 606                 # Get the ParserOutput actually *displayed* here.
 607                 # Note that $this->mParserOutput is the *current* version output.
 608                 $pOutput = ( $outputDone instanceof ParserOutput )
 609                         ? $outputDone // object fetched by hook
 610                         : $this->mParserOutput;
 611
 612                 # Adjust title for main page & pages with displaytitle
 613                 if ( $pOutput ) {
 614                         $this->adjustDisplayTitle( $pOutput );
 615                 }
 616
 617                 # For the main page, overwrite the <title> element with the con-
 618                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 619                 # that's not empty).
 620                 # This message always exists because it is in the i18n files
 621                 if ( $this->getTitle()->isMainPage() ) {
 622                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 623                         if ( !$msg->isDisabled() ) {
 624                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 625                         }
 626                 }
 627
 628                 # Check for any __NOINDEX__ tags on the page using $pOutput
 629                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 630                 $wgOut->setIndexPolicy( $policy['index'] );
 631                 $wgOut->setFollowPolicy( $policy['follow'] );
 632
 633                 $this->showViewFooter();
 634                 $this->mPage->doViewUpdates( $wgUser );
 635
 636                 wfProfileOut( __METHOD__ );
 637         }
 638
 639         /**
 640          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 641          * @param $pOutput ParserOutput
 642          */
 643         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 644                 global $wgOut;
 645                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 646                 $titleText = $pOutput->getTitleText();
 647                 if ( strval( $titleText ) !== '' ) {
 648                         $wgOut->setPageTitle( $titleText );
 649                 }
 650         }
 651
 652         /**
 653          * Show a diff page according to current request variables. For use within
 654          * Article::view() only, other callers should use the DifferenceEngine class.
 655          */
 656         public function showDiffPage() {
 657                 global $wgRequest, $wgUser;
 658
 659                 $diff = $wgRequest->getVal( 'diff' );
 660                 $rcid = $wgRequest->getVal( 'rcid' );
 661                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 662                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 663                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 664                 $oldid = $this->getOldID();
 665
 666                 $de = new DifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 667                 // DifferenceEngine directly fetched the revision:
 668                 $this->mRevIdFetched = $de->mNewid;
 669                 $de->showDiffPage( $diffOnly );
 670
 671                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 672                         # Run view updates for current revision only
 673                         $this->mPage->doViewUpdates( $wgUser );
 674                 }
 675         }
 676
 677         /**
 678          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 679          * Article::view() only.
 680          *
 681          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 682          * page views.
 683          */
 684         protected function showCssOrJsPage() {
 685                 global $wgOut;
 686
 687                 $dir = $this->getContext()->getLanguage()->getDir();
 688                 $lang = $this->getContext()->getLanguage()->getCode();
 689
 690                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 691                         'clearyourcache' );
 692
 693                 // Give hooks a chance to customise the output
 694                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 695                         // Wrap the whole lot in a <pre> and don't parse
 696                         $m = array();
 697                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 698                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 699                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 700                         $wgOut->addHTML( "\n</pre>\n" );
 701                 }
 702         }
 703
 704         /**
 705          * Get the robot policy to be used for the current view
 706          * @param $action String the action= GET parameter
 707          * @param $pOutput ParserOutput
 708          * @return Array the policy that should be set
 709          * TODO: actions other than 'view'
 710          */
 711         public function getRobotPolicy( $action, $pOutput ) {
 712                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 713                 global $wgDefaultRobotPolicy, $wgRequest;
 714
 715                 $ns = $this->getTitle()->getNamespace();
 716
 717                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 718                         # Don't index user and user talk pages for blocked users (bug 11443)
 719                         if ( !$this->getTitle()->isSubpage() ) {
 720                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 721                                         return array(
 722                                                 'index'  => 'noindex',
 723                                                 'follow' => 'nofollow'
 724                                         );
 725                                 }
 726                         }
 727                 }
 728
 729                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 730                         # Non-articles (special pages etc), and old revisions
 731                         return array(
 732                                 'index'  => 'noindex',
 733                                 'follow' => 'nofollow'
 734                         );
 735                 } elseif ( $wgOut->isPrintable() ) {
 736                         # Discourage indexing of printable versions, but encourage following
 737                         return array(
 738                                 'index'  => 'noindex',
 739                                 'follow' => 'follow'
 740                         );
 741                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 742                         # For ?curid=x urls, disallow indexing
 743                         return array(
 744                                 'index'  => 'noindex',
 745                                 'follow' => 'follow'
 746                         );
 747                 }
 748
 749                 # Otherwise, construct the policy based on the various config variables.
 750                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 751
 752                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 753                         # Honour customised robot policies for this namespace
 754                         $policy = array_merge(
 755                                 $policy,
 756                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 757                         );
 758                 }
 759                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 760                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 761                         # a final sanity check that we have really got the parser output.
 762                         $policy = array_merge(
 763                                 $policy,
 764                                 array( 'index' => $pOutput->getIndexPolicy() )
 765                         );
 766                 }
 767
 768                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 769                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 770                         $policy = array_merge(
 771                                 $policy,
 772                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 773                         );
 774                 }
 775
 776                 return $policy;
 777         }
 778
 779         /**
 780          * Converts a String robot policy into an associative array, to allow
 781          * merging of several policies using array_merge().
 782          * @param $policy Mixed, returns empty array on null/false/'', transparent
 783          *            to already-converted arrays, converts String.
 784          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 785          */
 786         public static function formatRobotPolicy( $policy ) {
 787                 if ( is_array( $policy ) ) {
 788                         return $policy;
 789                 } elseif ( !$policy ) {
 790                         return array();
 791                 }
 792
 793                 $policy = explode( ',', $policy );
 794                 $policy = array_map( 'trim', $policy );
 795
 796                 $arr = array();
 797                 foreach ( $policy as $var ) {
 798                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 799                                 $arr['index'] = $var;
 800                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 801                                 $arr['follow'] = $var;
 802                         }
 803                 }
 804
 805                 return $arr;
 806         }
 807
 808         /**
 809          * If this request is a redirect view, send "redirected from" subtitle to
 810          * $wgOut. Returns true if the header was needed, false if this is not a
 811          * redirect view. Handles both local and remote redirects.
 812          *
 813          * @return boolean
 814          */
 815         public function showRedirectedFromHeader() {
 816                 global $wgOut, $wgRequest, $wgRedirectSources;
 817
 818                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 819
 820                 if ( isset( $this->mRedirectedFrom ) ) {
 821                         // This is an internally redirected page view.
 822                         // We'll need a backlink to the source page for navigation.
 823                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 824                                 $redir = Linker::linkKnown(
 825                                         $this->mRedirectedFrom,
 826                                         null,
 827                                         array(),
 828                                         array( 'redirect' => 'no' )
 829                                 );
 830
 831                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 832
 833                                 // Set the fragment if one was specified in the redirect
 834                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 835                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 836                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 837                                 }
 838
 839                                 // Add a <link rel="canonical"> tag
 840                                 $wgOut->addLink( array( 'rel' => 'canonical',
 841                                         'href' => $this->getTitle()->getLocalURL() )
 842                                 );
 843
 844                                 // Tell $wgOut the user arrived at this article through a redirect
 845                                 $wgOut->setRedirectedFrom( $this->mRedirectedFrom );
 846
 847                                 return true;
 848                         }
 849                 } elseif ( $rdfrom ) {
 850                         // This is an externally redirected view, from some other wiki.
 851                         // If it was reported from a trusted site, supply a backlink.
 852                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 853                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 854                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 855
 856                                 return true;
 857                         }
 858                 }
 859
 860                 return false;
 861         }
 862
 863         /**
 864          * Show a header specific to the namespace currently being viewed, like
 865          * [[MediaWiki:Talkpagetext]]. For Article::view().
 866          */
 867         public function showNamespaceHeader() {
 868                 global $wgOut;
 869
 870                 if ( $this->getTitle()->isTalkPage() ) {
 871                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 872                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 873                         }
 874                 }
 875         }
 876
 877         /**
 878          * Show the footer section of an ordinary page view
 879          */
 880         public function showViewFooter() {
 881                 global $wgOut;
 882
 883                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 884                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 885                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 886                 }
 887
 888                 # If we have been passed an &rcid= parameter, we want to give the user a
 889                 # chance to mark this new article as patrolled.
 890                 $this->showPatrolFooter();
 891
 892                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 893
 894         }
 895
 896         /**
 897          * If patrol is possible, output a patrol UI box. This is called from the
 898          * footer section of ordinary page views. If patrol is not possible or not
 899          * desired, does nothing.
 900          */
 901         public function showPatrolFooter() {
 902                 global $wgOut, $wgRequest, $wgUser;
 903
 904                 $rcid = $wgRequest->getVal( 'rcid' );
 905
 906                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 907                         return;
 908                 }
 909
 910                 $token = $wgUser->getEditToken( $rcid );
 911                 $wgOut->preventClickjacking();
 912
 913                 $wgOut->addHTML(
 914                         "<div class='patrollink'>" .
 915                                 wfMsgHtml(
 916                                         'markaspatrolledlink',
 917                                         Linker::link(
 918                                                 $this->getTitle(),
 919                                                 wfMsgHtml( 'markaspatrolledtext' ),
 920                                                 array(),
 921                                                 array(
 922                                                         'action' => 'markpatrolled',
 923                                                         'rcid' => $rcid,
 924                                                         'token' => $token,
 925                                                 ),
 926                                                 array( 'known', 'noclasses' )
 927                                         )
 928                                 ) .
 929                         '</div>'
 930                 );
 931         }
 932
 933         /**
 934          * Show the error text for a missing article. For articles in the MediaWiki
 935          * namespace, show the default message text. To be called from Article::view().
 936          */
 937         public function showMissingArticle() {
 938                 global $wgOut, $wgRequest, $wgUser, $wgSend404Code;
 939
 940                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 941                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 942                         $parts = explode( '/', $this->getTitle()->getText() );
 943                         $rootPart = $parts[0];
 944                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 945                         $ip = User::isIP( $rootPart );
 946
 947                         if ( !($user && $user->isLoggedIn()) && !$ip ) { # User does not exist
 948                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 949                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 950                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 951                                 LogEventsList::showLogExtract(
 952                                         $wgOut,
 953                                         'block',
 954                                         $user->getUserPage()->getPrefixedText(),
 955                                         '',
 956                                         array(
 957                                                 'lim' => 1,
 958                                                 'showIfEmpty' => false,
 959                                                 'msgKey' => array(
 960                                                         'blocked-notice-logextract',
 961                                                         $user->getName() # Support GENDER in notice
 962                                                 )
 963                                         )
 964                                 );
 965                         }
 966                 }
 967
 968                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 969
 970                 # Show delete and move logs
 971                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 972                         array(  'lim' => 10,
 973                                 'conds' => array( "log_action != 'revision'" ),
 974                                 'showIfEmpty' => false,
 975                                 'msgKey' => array( 'moveddeleted-notice' ) )
 976                 );
 977
 978                 # Show error message
 979                 $oldid = $this->getOldID();
 980                 if ( $oldid ) {
 981                         $text = wfMsgNoTrans( 'missing-article',
 982                                 $this->getTitle()->getPrefixedText(),
 983                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 984                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 985                         // Use the default message text
 986                         $text = $this->getTitle()->getDefaultMessageText();
 987                 } else {
 988                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 989                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 990                         $errors = array_merge( $createErrors, $editErrors );
 991
 992                         if ( !count( $errors ) ) {
 993                                 $text = wfMsgNoTrans( 'noarticletext' );
 994                         } else {
 995                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 996                         }
 997                 }
 998                 $text = "<div class='noarticletext'>\n$text\n</div>";
 999
1000                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code ) {
1001                         // If there's no backing content, send a 404 Not Found
1002                         // for better machine handling of broken links.
1003                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
1004                 }
1005
1006                 $wgOut->addWikiText( $text );
1007         }
1008
1009         /**
1010          * If the revision requested for view is deleted, check permissions.
1011          * Send either an error message or a warning header to $wgOut.
1012          *
1013          * @return boolean true if the view is allowed, false if not.
1014          */
1015         public function showDeletedRevisionHeader() {
1016                 global $wgOut, $wgRequest;
1017
1018                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1019                         // Not deleted
1020                         return true;
1021                 }
1022
1023                 // If the user is not allowed to see it...
1024                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1025                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1026                                 'rev-deleted-text-permission' );
1027
1028                         return false;
1029                 // If the user needs to confirm that they want to see it...
1030                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1031                         # Give explanation and add a link to view the revision...
1032                         $oldid = intval( $this->getOldID() );
1033                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
1034                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1035                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1036                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1037                                 array( $msg, $link ) );
1038
1039                         return false;
1040                 // We are allowed to see...
1041                 } else {
1042                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1043                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1044                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1045
1046                         return true;
1047                 }
1048         }
1049
1050         /**
1051          * Generate the navigation links when browsing through an article revisions
1052          * It shows the information as:
1053          *   Revision as of \<date\>; view current revision
1054          *   \<- Previous version | Next Version -\>
1055          *
1056          * @param $oldid String: revision ID of this article revision
1057          */
1058         public function setOldSubtitle( $oldid = 0 ) {
1059                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1060
1061                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1062                         return;
1063                 }
1064
1065                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1066
1067                 # Cascade unhide param in links for easy deletion browsing
1068                 $extraParams = array();
1069                 if ( $wgRequest->getVal( 'unhide' ) ) {
1070                         $extraParams['unhide'] = 1;
1071                 }
1072
1073                 $revision = Revision::newFromId( $oldid );
1074                 $timestamp = $revision->getTimestamp();
1075
1076                 $current = ( $oldid == $this->mPage->getLatest() );
1077                 $td = $wgLang->timeanddate( $timestamp, true );
1078                 $tddate = $wgLang->date( $timestamp, true );
1079                 $tdtime = $wgLang->time( $timestamp, true );
1080
1081                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1082                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1083
1084                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1085                         ? 'revision-info-current'
1086                         : 'revision-info';
1087
1088                 $wgOut->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1089                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1090                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1091
1092                 $lnk = $current
1093                         ? wfMsgHtml( 'currentrevisionlink' )
1094                         : Linker::link(
1095                                 $this->getTitle(),
1096                                 wfMsgHtml( 'currentrevisionlink' ),
1097                                 array(),
1098                                 $extraParams,
1099                                 array( 'known', 'noclasses' )
1100                         );
1101                 $curdiff = $current
1102                         ? wfMsgHtml( 'diff' )
1103                         : Linker::link(
1104                                 $this->getTitle(),
1105                                 wfMsgHtml( 'diff' ),
1106                                 array(),
1107                                 array(
1108                                         'diff' => 'cur',
1109                                         'oldid' => $oldid
1110                                 ) + $extraParams,
1111                                 array( 'known', 'noclasses' )
1112                         );
1113                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1114                 $prevlink = $prev
1115                         ? Linker::link(
1116                                 $this->getTitle(),
1117                                 wfMsgHtml( 'previousrevision' ),
1118                                 array(),
1119                                 array(
1120                                         'direction' => 'prev',
1121                                         'oldid' => $oldid
1122                                 ) + $extraParams,
1123                                 array( 'known', 'noclasses' )
1124                         )
1125                         : wfMsgHtml( 'previousrevision' );
1126                 $prevdiff = $prev
1127                         ? Linker::link(
1128                                 $this->getTitle(),
1129                                 wfMsgHtml( 'diff' ),
1130                                 array(),
1131                                 array(
1132                                         'diff' => 'prev',
1133                                         'oldid' => $oldid
1134                                 ) + $extraParams,
1135                                 array( 'known', 'noclasses' )
1136                         )
1137                         : wfMsgHtml( 'diff' );
1138                 $nextlink = $current
1139                         ? wfMsgHtml( 'nextrevision' )
1140                         : Linker::link(
1141                                 $this->getTitle(),
1142                                 wfMsgHtml( 'nextrevision' ),
1143                                 array(),
1144                                 array(
1145                                         'direction' => 'next',
1146                                         'oldid' => $oldid
1147                                 ) + $extraParams,
1148                                 array( 'known', 'noclasses' )
1149                         );
1150                 $nextdiff = $current
1151                         ? wfMsgHtml( 'diff' )
1152                         : Linker::link(
1153                                 $this->getTitle(),
1154                                 wfMsgHtml( 'diff' ),
1155                                 array(),
1156                                 array(
1157                                         'diff' => 'next',
1158                                         'oldid' => $oldid
1159                                 ) + $extraParams,
1160                                 array( 'known', 'noclasses' )
1161                         );
1162
1163                 $cdel = Linker::getRevDeleteLink( $wgUser, $revision, $this->getTitle() );
1164                 if ( $cdel !== '' ) {
1165                         $cdel .= ' ';
1166                 }
1167
1168                 $wgOut->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1169                         wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1170                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>" );
1171         }
1172
1173         /**
1174          * View redirect
1175          *
1176          * @param $target Title|Array of destination(s) to redirect
1177          * @param $appendSubtitle Boolean [optional]
1178          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1179          * @return string containing HMTL with redirect link
1180          */
1181         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1182                 global $wgOut, $wgStylePath;
1183
1184                 if ( !is_array( $target ) ) {
1185                         $target = array( $target );
1186                 }
1187
1188                 $lang = $this->getTitle()->getPageLanguage();
1189                 $imageDir = $lang->getDir();
1190
1191                 if ( $appendSubtitle ) {
1192                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1193                 }
1194
1195                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1196
1197                 /**
1198                  * @var $title Title
1199                  */
1200                 $title = array_shift( $target );
1201
1202                 if ( $forceKnown ) {
1203                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1204                 } else {
1205                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1206                 }
1207
1208                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1209                 $alt = $lang->isRTL() ? '←' : '→';
1210                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1211                 foreach ( $target as $rt ) {
1212                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1213                         if ( $forceKnown ) {
1214                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1215                         } else {
1216                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1217                         }
1218                 }
1219
1220                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1221                 return '<div class="redirectMsg">' .
1222                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1223                         '<span class="redirectText">' . $link . '</span></div>';
1224         }
1225
1226         /**
1227          * Handle action=render
1228          */
1229         public function render() {
1230                 global $wgOut;
1231
1232                 $wgOut->setArticleBodyOnly( true );
1233                 $this->view();
1234         }
1235
1236         /**
1237          * action=protect handler
1238          */
1239         public function protect() {
1240                 $form = new ProtectionForm( $this );
1241                 $form->execute();
1242         }
1243
1244         /**
1245          * action=unprotect handler (alias)
1246          */
1247         public function unprotect() {
1248                 $this->protect();
1249         }
1250
1251         /**
1252          * UI entry point for page deletion
1253          */
1254         public function delete() {
1255                 global $wgOut, $wgRequest, $wgLang;
1256
1257                 # This code desperately needs to be totally rewritten
1258
1259                 $title = $this->getTitle();
1260                 $user = $this->getContext()->getUser();
1261
1262                 # Check permissions
1263                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1264                 if ( count( $permission_errors ) ) {
1265                         throw new PermissionsError( 'delete', $permission_errors );
1266                 }
1267
1268                 # Read-only check...
1269                 if ( wfReadOnly() ) {
1270                         throw new ReadOnlyError;
1271                 }
1272
1273                 # Better double-check that it hasn't been deleted yet!
1274                 $dbw = wfGetDB( DB_MASTER );
1275                 $conds = $title->pageCond();
1276                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1277                 if ( $latest === false ) {
1278                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1279                         $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1280                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1281                                 );
1282                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1283                         LogEventsList::showLogExtract(
1284                                 $wgOut,
1285                                 'delete',
1286                                 $title->getPrefixedText()
1287                         );
1288
1289                         return;
1290                 }
1291
1292                 $deleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1293                 $deleteReason = $wgRequest->getText( 'wpReason' );
1294
1295                 if ( $deleteReasonList == 'other' ) {
1296                         $reason = $deleteReason;
1297                 } elseif ( $deleteReason != '' ) {
1298                         // Entry from drop down menu + additional comment
1299                         $reason = $deleteReasonList . wfMsgForContent( 'colon-separator' ) . $deleteReason;
1300                 } else {
1301                         $reason = $deleteReasonList;
1302                 }
1303
1304                 if ( $wgRequest->wasPosted() && $user->matchEditToken( $wgRequest->getVal( 'wpEditToken' ),
1305                         array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
1306                 {
1307                         # Flag to hide all contents of the archived revisions
1308                         $suppress = $wgRequest->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1309
1310                         $this->doDelete( $reason, $suppress );
1311
1312                         if ( $wgRequest->getCheck( 'wpWatch' ) && $user->isLoggedIn() ) {
1313                                 $this->doWatch();
1314                         } elseif ( $title->userIsWatching() ) {
1315                                 $this->doUnwatch();
1316                         }
1317
1318                         return;
1319                 }
1320
1321                 // Generate deletion reason
1322                 $hasHistory = false;
1323                 if ( !$reason ) {
1324                         $reason = $this->generateReason( $hasHistory );
1325                 }
1326
1327                 // If the page has a history, insert a warning
1328                 if ( $hasHistory ) {
1329                         $revisions = $this->mTitle->estimateRevisionCount();
1330                         // @todo FIXME: i18n issue/patchwork message
1331                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1332                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1333                                 wfMsgHtml( 'word-separator' ) . Linker::link( $title,
1334                                         wfMsgHtml( 'history' ),
1335                                         array( 'rel' => 'archives' ),
1336                                         array( 'action' => 'history' ) ) .
1337                                 '</strong>'
1338                         );
1339
1340                         if ( $this->mTitle->isBigDeletion() ) {
1341                                 global $wgDeleteRevisionsLimit;
1342                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1343                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1344                         }
1345                 }
1346
1347                 return $this->confirmDelete( $reason );
1348         }
1349
1350         /**
1351          * Output deletion confirmation dialog
1352          * @todo FIXME: Move to another file?
1353          * @param $reason String: prefilled reason
1354          */
1355         public function confirmDelete( $reason ) {
1356                 global $wgOut;
1357
1358                 wfDebug( "Article::confirmDelete\n" );
1359
1360                 $wgOut->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1361                 $wgOut->addBacklinkSubtitle( $this->getTitle() );
1362                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1363                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1364
1365                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1366
1367                 $user = $this->getContext()->getUser();
1368
1369                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1370                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1371                                         <td></td>
1372                                         <td class='mw-input'><strong>" .
1373                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1374                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1375                                         "</strong></td>
1376                                 </tr>";
1377                 } else {
1378                         $suppress = '';
1379                 }
1380                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1381
1382                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1383                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1384                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1385                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1386                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1387                         "<tr id=\"wpDeleteReasonListRow\">
1388                                 <td class='mw-label'>" .
1389                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1390                                 "</td>
1391                                 <td class='mw-input'>" .
1392                                         Xml::listDropDown( 'wpDeleteReasonList',
1393                                                 wfMsgForContent( 'deletereason-dropdown' ),
1394                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1395                                 "</td>
1396                         </tr>
1397                         <tr id=\"wpDeleteReasonRow\">
1398                                 <td class='mw-label'>" .
1399                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1400                                 "</td>
1401                                 <td class='mw-input'>" .
1402                                 Html::input( 'wpReason', $reason, 'text', array(
1403                                         'size' => '60',
1404                                         'maxlength' => '255',
1405                                         'tabindex' => '2',
1406                                         'id' => 'wpReason',
1407                                         'autofocus'
1408                                 ) ) .
1409                                 "</td>
1410                         </tr>";
1411
1412                 # Disallow watching if user is not logged in
1413                 if ( $user->isLoggedIn() ) {
1414                         $form .= "
1415                         <tr>
1416                                 <td></td>
1417                                 <td class='mw-input'>" .
1418                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1419                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1420                                 "</td>
1421                         </tr>";
1422                 }
1423
1424                 $form .= "
1425                         $suppress
1426                         <tr>
1427                                 <td></td>
1428                                 <td class='mw-submit'>" .
1429                                         Xml::submitButton( wfMsg( 'deletepage' ),
1430                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1431                                 "</td>
1432                         </tr>" .
1433                         Xml::closeElement( 'table' ) .
1434                         Xml::closeElement( 'fieldset' ) .
1435                         Html::hidden( 'wpEditToken', $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1436                         Xml::closeElement( 'form' );
1437
1438                         if ( $user->isAllowed( 'editinterface' ) ) {
1439                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1440                                 $link = Linker::link(
1441                                         $title,
1442                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1443                                         array(),
1444                                         array( 'action' => 'edit' )
1445                                 );
1446                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1447                         }
1448
1449                 $wgOut->addHTML( $form );
1450                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1451                 LogEventsList::showLogExtract( $wgOut, 'delete',
1452                         $this->getTitle()->getPrefixedText()
1453                 );
1454         }
1455
1456         /**
1457          * Perform a deletion and output success or failure messages
1458          * @param $reason
1459          * @param $suppress bool
1460          */
1461         public function doDelete( $reason, $suppress = false ) {
1462                 global $wgOut;
1463
1464                 $error = '';
1465                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, 0, true, $error ) ) {
1466                         $deleted = $this->getTitle()->getPrefixedText();
1467
1468                         $wgOut->setPageTitle( wfMessage( 'actioncomplete' ) );
1469                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1470
1471                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1472
1473                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1474                         $wgOut->returnToMain( false );
1475                 } else {
1476                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1477                         if ( $error == '' ) {
1478                                 $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1479                                         array( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1480                                 );
1481                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1482
1483                                 LogEventsList::showLogExtract(
1484                                         $wgOut,
1485                                         'delete',
1486                                         $this->getTitle()->getPrefixedText()
1487                                 );
1488                         } else {
1489                                 $wgOut->addHTML( $error );
1490                         }
1491                 }
1492         }
1493
1494         /* Caching functions */
1495
1496         /**
1497          * checkLastModified returns true if it has taken care of all
1498          * output to the client that is necessary for this request.
1499          * (that is, it has sent a cached version of the page)
1500          *
1501          * @return boolean true if cached version send, false otherwise
1502          */
1503         protected function tryFileCache() {
1504                 static $called = false;
1505
1506                 if ( $called ) {
1507                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1508                         return false;
1509                 }
1510
1511                 $called = true;
1512                 if ( $this->isFileCacheable() ) {
1513                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1514                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1515                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1516                                 $cache->loadFromFileCache( $this->getContext() );
1517                                 return true;
1518                         } else {
1519                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1520                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1521                         }
1522                 } else {
1523                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1524                 }
1525
1526                 return false;
1527         }
1528
1529         /**
1530          * Check if the page can be cached
1531          * @return bool
1532          */
1533         public function isFileCacheable() {
1534                 $cacheable = false;
1535
1536                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1537                         $cacheable = $this->mPage->getID()
1538                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1539                         // Extension may have reason to disable file caching on some pages.
1540                         if ( $cacheable ) {
1541                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1542                         }
1543                 }
1544
1545                 return $cacheable;
1546         }
1547
1548         /**#@-*/
1549
1550         /**
1551          * Lightweight method to get the parser output for a page, checking the parser cache
1552          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1553          * consider, so it's not appropriate to use there.
1554          *
1555          * @since 1.16 (r52326) for LiquidThreads
1556          *
1557          * @param $oldid mixed integer Revision ID or null
1558          * @param $user User The relevant user
1559          * @return ParserOutput or false if the given revsion ID is not found
1560          */
1561         public function getParserOutput( $oldid = null, User $user = null ) {
1562                 global $wgUser;
1563
1564                 $user = is_null( $user ) ? $wgUser : $user;
1565                 $parserOptions = $this->mPage->makeParserOptions( $user );
1566
1567                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1568         }
1569
1570         /**
1571          * Get parser options suitable for rendering the primary article wikitext
1572          * @return ParserOptions|false
1573          */
1574         public function getParserOptions() {
1575                 global $wgUser;
1576                 if ( !$this->mParserOptions ) {
1577                         $this->mParserOptions = $this->mPage->makeParserOptions( $wgUser );
1578                 }
1579                 // Clone to allow modifications of the return value without affecting cache
1580                 return clone $this->mParserOptions;
1581         }
1582
1583         /**
1584          * Sets the context this Article is executed in
1585          *
1586          * @param $context IContextSource
1587          * @since 1.18
1588          */
1589         public function setContext( $context ) {
1590                 $this->mContext = $context;
1591         }
1592
1593         /**
1594          * Gets the context this Article is executed in
1595          *
1596          * @return IContextSource
1597          * @since 1.18
1598          */
1599         public function getContext() {
1600                 if ( $this->mContext instanceof IContextSource ) {
1601                         return $this->mContext;
1602                 } else {
1603                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1604                         return RequestContext::getMain();
1605                 }
1606         }
1607
1608         /**
1609          * Info about this page
1610          * @deprecated since 1.19
1611          */
1612         public function info() {
1613                 wfDeprecated( __METHOD__, '1.19' );
1614                 Action::factory( 'info', $this )->show();
1615         }
1616
1617         /**
1618          * Mark this particular edit/page as patrolled
1619          * @deprecated since 1.18
1620          */
1621         public function markpatrolled() {
1622                 wfDeprecated( __METHOD__, '1.18' );
1623                 Action::factory( 'markpatrolled', $this )->show();
1624         }
1625
1626         /**
1627          * Handle action=purge
1628          * @deprecated since 1.19
1629          */
1630         public function purge() {
1631                 return Action::factory( 'purge', $this )->show();
1632         }
1633
1634         /**
1635          * Handle action=revert
1636          * @deprecated since 1.19
1637          */
1638         public function revert() {
1639                 wfDeprecated( __METHOD__, '1.19' );
1640                 Action::factory( 'revert', $this )->show();
1641         }
1642
1643         /**
1644          * Handle action=rollback
1645          * @deprecated since 1.19
1646          */
1647         public function rollback() {
1648                 wfDeprecated( __METHOD__, '1.19' );
1649                 Action::factory( 'rollback', $this )->show();
1650         }
1651
1652         /**
1653          * User-interface handler for the "watch" action.
1654          * Requires Request to pass a token as of 1.18.
1655          * @deprecated since 1.18
1656          */
1657         public function watch() {
1658                 wfDeprecated( __METHOD__, '1.18' );
1659                 Action::factory( 'watch', $this )->show();
1660         }
1661
1662         /**
1663          * Add this page to $wgUser's watchlist
1664          *
1665          * This is safe to be called multiple times
1666          *
1667          * @return bool true on successful watch operation
1668          * @deprecated since 1.18
1669          */
1670         public function doWatch() {
1671                 global $wgUser;
1672                 wfDeprecated( __METHOD__, '1.18' );
1673                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1674         }
1675
1676         /**
1677          * User interface handler for the "unwatch" action.
1678          * Requires Request to pass a token as of 1.18.
1679          * @deprecated since 1.18
1680          */
1681         public function unwatch() {
1682                 wfDeprecated( __METHOD__, '1.18' );
1683                 Action::factory( 'unwatch', $this )->show();
1684         }
1685
1686         /**
1687          * Stop watching a page
1688          * @return bool true on successful unwatch
1689          * @deprecated since 1.18
1690          */
1691         public function doUnwatch() {
1692                 global $wgUser;
1693                 wfDeprecated( __METHOD__, '1.18' );
1694                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1695         }
1696
1697         /**
1698          * Output a redirect back to the article.
1699          * This is typically used after an edit.
1700          *
1701          * @deprecated in 1.18; call $wgOut->redirect() directly
1702          * @param $noRedir Boolean: add redirect=no
1703          * @param $sectionAnchor String: section to redirect to, including "#"
1704          * @param $extraQuery String: extra query params
1705          */
1706         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1707                 wfDeprecated( __METHOD__, '1.18' );
1708                 global $wgOut;
1709
1710                 if ( $noRedir ) {
1711                         $query = 'redirect=no';
1712                         if ( $extraQuery )
1713                                 $query .= "&$extraQuery";
1714                 } else {
1715                         $query = $extraQuery;
1716                 }
1717
1718                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1719         }
1720
1721         /**
1722          * Use PHP's magic __get handler to handle accessing of
1723          * raw WikiPage fields for backwards compatibility.
1724          *
1725          * @param $fname String Field name
1726          */
1727         public function __get( $fname ) {
1728                 if ( property_exists( $this->mPage, $fname ) ) {
1729                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1730                         return $this->mPage->$fname;
1731                 }
1732                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1733         }
1734
1735         /**
1736          * Use PHP's magic __set handler to handle setting of
1737          * raw WikiPage fields for backwards compatibility.
1738          *
1739          * @param $fname String Field name
1740          * @param $fvalue mixed New value
1741          */
1742         public function __set( $fname, $fvalue ) {
1743                 if ( property_exists( $this->mPage, $fname ) ) {
1744                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1745                         $this->mPage->$fname = $fvalue;
1746                 // Note: extensions may want to toss on new fields
1747                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1748                         $this->mPage->$fname = $fvalue;
1749                 } else {
1750                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1751                 }
1752         }
1753
1754         /**
1755          * Use PHP's magic __call handler to transform instance calls to
1756          * WikiPage functions for backwards compatibility.
1757          *
1758          * @param $fname String Name of called method
1759          * @param $args Array Arguments to the method
1760          */
1761         public function __call( $fname, $args ) {
1762                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1763                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1764                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1765                 }
1766                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1767         }
1768
1769         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1770
1771         /**
1772          * @param $limit array
1773          * @param $expiry array
1774          * @param $cascade bool
1775          * @param $reason string
1776          * @param $user User
1777          * @return Status
1778          */
1779         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1780                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
1781         }
1782
1783         /**
1784          * @param $limit array
1785          * @param $reason string
1786          * @param $cascade int
1787          * @param $expiry array
1788          * @return bool
1789          */
1790         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1791                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
1792         }
1793
1794         /**
1795          * @param $reason string
1796          * @param $suppress bool
1797          * @param $id int
1798          * @param $commit bool
1799          * @param $error string
1800          * @return bool
1801          */
1802         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
1803                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
1804         }
1805
1806         /**
1807          * @param $fromP
1808          * @param $summary
1809          * @param $token
1810          * @param $bot
1811          * @param $resultDetails
1812          * @param $user User
1813          * @return array
1814          */
1815         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
1816                 global $wgUser;
1817                 $user = is_null( $user ) ? $wgUser : $user;
1818                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
1819         }
1820
1821         /**
1822          * @param $fromP
1823          * @param $summary
1824          * @param $bot
1825          * @param $resultDetails
1826          * @param $guser User
1827          * @return array
1828          */
1829         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
1830                 global $wgUser;
1831                 $guser = is_null( $guser ) ? $wgUser : $guser;
1832                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
1833         }
1834
1835         /**
1836          * @param $hasHistory bool
1837          * @return mixed
1838          */
1839         public function generateReason( &$hasHistory ) {
1840                 return $this->mPage->getAutoDeleteReason( $hasHistory );
1841         }
1842
1843         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
1844
1845         /**
1846          * @return array
1847          */
1848         public static function selectFields() {
1849                 return WikiPage::selectFields();
1850         }
1851
1852         /**
1853          * @param $title Title
1854          */
1855         public static function onArticleCreate( $title ) {
1856                 WikiPage::onArticleCreate( $title );
1857         }
1858
1859         /**
1860          * @param $title Title
1861          */
1862         public static function onArticleDelete( $title ) {
1863                 WikiPage::onArticleDelete( $title );
1864         }
1865
1866         /**
1867          * @param $title Title
1868          */
1869         public static function onArticleEdit( $title ) {
1870                 WikiPage::onArticleEdit( $title );
1871         }
1872
1873         /**
1874          * @param $oldtext
1875          * @param $newtext
1876          * @param $flags
1877          * @return string
1878          */
1879         public static function getAutosummary( $oldtext, $newtext, $flags ) {
1880                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
1881         }
1882         // ******
1883 }