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