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          * Tell the page view functions that this view was redirected
 131          * from another page on the wiki.
 132          * @param $from Title object.
 133          */
 134         public function setRedirectedFrom( Title $from ) {
 135                 $this->mRedirectedFrom = $from;
 136         }
 137
 138         /**
 139          * Get the title object of the article
 140          * @return Title object of this page
 141          */
 142         public function getTitle() {
 143                 return $this->mPage->getTitle();
 144         }
 145
 146         /**
 147          * Clear the object
 148          */
 149         public function clear() {
 150                 $this->mContentLoaded = false;
 151
 152                 $this->mRedirectedFrom = null; # Title object if set
 153                 $this->mRevIdFetched = 0;
 154                 $this->mRedirectUrl = false;
 155
 156                 $this->mPage->clear();
 157         }
 158
 159         /**
 160          * Note that getContent/loadContent do not follow redirects anymore.
 161          * If you need to fetch redirectable content easily, try
 162          * the shortcut in Article::followRedirect()
 163          *
 164          * This function has side effects! Do not use this function if you
 165          * only want the real revision text if any.
 166          *
 167          * @return Return the text of this revision
 168          */
 169         public function getContent() {
 170                 global $wgUser;
 171
 172                 wfProfileIn( __METHOD__ );
 173
 174                 if ( $this->mPage->getID() === 0 ) {
 175                         # If this is a MediaWiki:x message, then load the messages
 176                         # and return the message value for x.
 177                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 178                                 $text = $this->getTitle()->getDefaultMessageText();
 179                                 if ( $text === false ) {
 180                                         $text = '';
 181                                 }
 182                         } else {
 183                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 184                         }
 185                         wfProfileOut( __METHOD__ );
 186
 187                         return $text;
 188                 } else {
 189                         $this->loadContent();
 190                         wfProfileOut( __METHOD__ );
 191
 192                         return $this->mContent;
 193                 }
 194         }
 195
 196         /**
 197          * @return int The oldid of the article that is to be shown, 0 for the
 198          *             current revision
 199          */
 200         public function getOldID() {
 201                 if ( is_null( $this->mOldId ) ) {
 202                         $this->mOldId = $this->getOldIDFromRequest();
 203                 }
 204
 205                 return $this->mOldId;
 206         }
 207
 208         /**
 209          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 210          *
 211          * @return int The old id for the request
 212          */
 213         public function getOldIDFromRequest() {
 214                 global $wgRequest;
 215
 216                 $this->mRedirectUrl = false;
 217
 218                 $oldid = $wgRequest->getVal( 'oldid' );
 219
 220                 if ( isset( $oldid ) ) {
 221                         $oldid = intval( $oldid );
 222                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 223                                 $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 224                                 if ( $nextid ) {
 225                                         $oldid = $nextid;
 226                                 } else {
 227                                         $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 228                                 }
 229                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 230                                 $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 231                                 if ( $previd ) {
 232                                         $oldid = $previd;
 233                                 }
 234                         }
 235                 }
 236
 237                 if ( !$oldid ) {
 238                         $oldid = 0;
 239                 }
 240
 241                 return $oldid;
 242         }
 243
 244         /**
 245          * Load the revision (including text) into this object
 246          */
 247         function loadContent() {
 248                 if ( $this->mContentLoaded ) {
 249                         return;
 250                 }
 251
 252                 wfProfileIn( __METHOD__ );
 253
 254                 $this->fetchContent( $this->getOldID() );
 255
 256                 wfProfileOut( __METHOD__ );
 257         }
 258
 259         /**
 260          * Get text of an article from database
 261          * Does *NOT* follow redirects.
 262          *
 263          * @param $oldid Int: 0 for whatever the latest revision is
 264          * @return mixed string containing article contents, or false if null
 265          */
 266         function fetchContent( $oldid = 0 ) {
 267                 if ( $this->mContentLoaded ) {
 268                         return $this->mContent;
 269                 }
 270
 271                 # Pre-fill content with error message so that if something
 272                 # fails we'll have something telling us what we intended.
 273                 $t = $this->getTitle()->getPrefixedText();
 274                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 275                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 276
 277                 if ( $oldid ) {
 278                         $revision = Revision::newFromId( $oldid );
 279                         if ( !$revision ) {
 280                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 281                                 return false;
 282                         }
 283                         // Revision title doesn't match the page title given?
 284                         if ( $this->mPage->getID() != $revision->getPage() ) {
 285                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 286                                 $this->mPage = call_user_func( $function, $revision->getPage() );
 287                                 if ( !$this->mPage->getId() ) {
 288                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 289                                         return false;
 290                                 }
 291                         }
 292                 } else {
 293                         if ( !$this->mPage->getLatest() ) {
 294                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 295                                 return false;
 296                         }
 297
 298                         $revision = $this->mPage->getRevision();
 299                         if ( !$revision ) {
 300                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 301                                 return false;
 302                         }
 303                 }
 304
 305                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 306                 // We should instead work with the Revision object when we need it...
 307                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 308
 309                 $this->mRevIdFetched = $revision->getId();
 310                 $this->mContentLoaded = true;
 311                 $this->mRevision =& $revision;
 312
 313                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 314
 315                 return $this->mContent;
 316         }
 317
 318         /**
 319          * No-op
 320          * @deprecated since 1.18
 321          */
 322         public function forUpdate() {
 323                 wfDeprecated( __METHOD__ );
 324         }
 325
 326         /**
 327          * Returns true if the currently-referenced revision is the current edit
 328          * to this page (and it exists).
 329          * @return bool
 330          */
 331         public function isCurrent() {
 332                 # If no oldid, this is the current version.
 333                 if ( $this->getOldID() == 0 ) {
 334                         return true;
 335                 }
 336
 337                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 338         }
 339
 340         /**
 341          * Use this to fetch the rev ID used on page views
 342          *
 343          * @return int revision ID of last article revision
 344          */
 345         public function getRevIdFetched() {
 346                 if ( $this->mRevIdFetched ) {
 347                         return $this->mRevIdFetched;
 348                 } else {
 349                         return $this->mPage->getLatest();
 350                 }
 351         }
 352
 353         /**
 354          * This is the default action of the index.php entry point: just view the
 355          * page of the given title.
 356          */
 357         public function view() {
 358                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 359                 global $wgUseFileCache, $wgUseETag;
 360
 361                 wfProfileIn( __METHOD__ );
 362
 363                 # Get variables from query string
 364                 $oldid = $this->getOldID();
 365
 366                 # getOldID may want us to redirect somewhere else
 367                 if ( $this->mRedirectUrl ) {
 368                         $wgOut->redirect( $this->mRedirectUrl );
 369                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 370                         wfProfileOut( __METHOD__ );
 371
 372                         return;
 373                 }
 374
 375                 # Set page title (may be overridden by DISPLAYTITLE)
 376                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 377
 378                 # If we got diff in the query, we want to see a diff page instead of the article.
 379                 if ( $wgRequest->getCheck( 'diff' ) ) {
 380                         wfDebug( __METHOD__ . ": showing diff page\n" );
 381                         $this->showDiffPage();
 382                         wfProfileOut( __METHOD__ );
 383
 384                         return;
 385                 }
 386
 387                 $wgOut->setArticleFlag( true );
 388                 # Allow frames by default
 389                 $wgOut->allowClickjacking();
 390
 391                 $parserCache = ParserCache::singleton();
 392
 393                 $parserOptions = $this->getParserOptions();
 394                 # Render printable version, use printable version cache
 395                 if ( $wgOut->isPrintable() ) {
 396                         $parserOptions->setIsPrintable( true );
 397                         $parserOptions->setEditSection( false );
 398                 } elseif ( $wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 399                         $parserOptions->setEditSection( false );
 400                 }
 401
 402                 # Try client and file cache
 403                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 404                         if ( $wgUseETag ) {
 405                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 406                         }
 407
 408                         # Is it client cached?
 409                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 410                                 wfDebug( __METHOD__ . ": done 304\n" );
 411                                 wfProfileOut( __METHOD__ );
 412
 413                                 return;
 414                         # Try file cache
 415                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 416                                 wfDebug( __METHOD__ . ": done file cache\n" );
 417                                 # tell wgOut that output is taken care of
 418                                 $wgOut->disable();
 419                                 $this->mPage->viewUpdates();
 420                                 wfProfileOut( __METHOD__ );
 421
 422                                 return;
 423                         }
 424                 }
 425
 426                 if ( !$wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 427                         $parserOptions->setEditSection( false );
 428                 }
 429
 430                 # Should the parser cache be used?
 431                 $useParserCache = $this->useParserCache( $oldid );
 432                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 433                 if ( $wgUser->getStubThreshold() ) {
 434                         wfIncrStats( 'pcache_miss_stub' );
 435                 }
 436
 437                 $this->showRedirectedFromHeader();
 438                 $this->showNamespaceHeader();
 439
 440                 # Iterate through the possible ways of constructing the output text.
 441                 # Keep going until $outputDone is set, or we run out of things to do.
 442                 $pass = 0;
 443                 $outputDone = false;
 444                 $this->mParserOutput = false;
 445
 446                 while ( !$outputDone && ++$pass ) {
 447                         switch( $pass ) {
 448                                 case 1:
 449                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 450                                         break;
 451                                 case 2:
 452                                         # Try the parser cache
 453                                         if ( $useParserCache ) {
 454                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 455
 456                                                 if ( $this->mParserOutput !== false ) {
 457                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 458                                                         $wgOut->addParserOutput( $this->mParserOutput );
 459                                                         # Ensure that UI elements requiring revision ID have
 460                                                         # the correct version information.
 461                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 462                                                         $outputDone = true;
 463                                                         # Preload timestamp to avoid a DB hit
 464                                                         if ( isset( $this->mParserOutput->mTimestamp ) ) {
 465                                                                 $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
 466                                                         }
 467                                                 }
 468                                         }
 469                                         break;
 470                                 case 3:
 471                                         $text = $this->getContent();
 472                                         if ( $text === false || $this->mPage->getID() == 0 ) {
 473                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 474                                                 $this->showMissingArticle();
 475                                                 wfProfileOut( __METHOD__ );
 476                                                 return;
 477                                         }
 478
 479                                         # Another whitelist check in case oldid is altering the title
 480                                         $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $wgUser );
 481                                         if ( count( $permErrors ) ) {
 482                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 483                                                 wfProfileOut( __METHOD__ );
 484                                                 throw new PermissionsError( 'read', $permErrors );
 485                                         }
 486
 487                                         # Are we looking at an old revision
 488                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 489                                                 $this->setOldSubtitle( $oldid );
 490
 491                                                 if ( !$this->showDeletedRevisionHeader() ) {
 492                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 493                                                         wfProfileOut( __METHOD__ );
 494                                                         return;
 495                                                 }
 496
 497                                                 # If this "old" version is the current, then try the parser cache...
 498                                                 if ( $oldid === $this->mPage->getLatest() && $this->useParserCache( false ) ) {
 499                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 500                                                         if ( $this->mParserOutput ) {
 501                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 502                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 503                                                                 $wgOut->setRevisionId( $this->mPage->getLatest() );
 504                                                                 $outputDone = true;
 505                                                                 break;
 506                                                         }
 507                                                 }
 508                                         }
 509
 510                                         # Ensure that UI elements requiring revision ID have
 511                                         # the correct version information.
 512                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 513
 514                                         # Pages containing custom CSS or JavaScript get special treatment
 515                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 516                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 517                                                 $this->showCssOrJsPage();
 518                                                 $outputDone = true;
 519                                         } elseif( !wfRunHooks( 'ArticleViewCustom', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 520                                                 # Allow extensions do their own custom view for certain pages
 521                                                 $outputDone = true;
 522                                         } else {
 523                                                 $rt = Title::newFromRedirectArray( $text );
 524                                                 if ( $rt ) {
 525                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 526                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 527                                                         $wgOut->addHTML( $this->viewRedirect( $rt ) );
 528                                                         # Parse just to get categories, displaytitle, etc.
 529                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 530                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 531                                                         $outputDone = true;
 532                                                 }
 533                                         }
 534                                         break;
 535                                 case 4:
 536                                         # Run the parse, protected by a pool counter
 537                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 538
 539                                         $key = $parserCache->getKey( $this, $parserOptions );
 540                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
 541
 542                                         if ( !$poolArticleView->execute() ) {
 543                                                 # Connection or timeout error
 544                                                 wfProfileOut( __METHOD__ );
 545                                                 return;
 546                                         } else {
 547                                                 $outputDone = true;
 548                                         }
 549                                         break;
 550                                 # Should be unreachable, but just in case...
 551                                 default:
 552                                         break 2;
 553                         }
 554                 }
 555
 556                 # Get the ParserOutput actually *displayed* here.
 557                 # Note that $this->mParserOutput is the *current* version output.
 558                 $pOutput = ( $outputDone instanceof ParserOutput )
 559                         ? $outputDone // object fetched by hook
 560                         : $this->mParserOutput;
 561
 562                 # Adjust title for main page & pages with displaytitle
 563                 if ( $pOutput ) {
 564                         $this->adjustDisplayTitle( $pOutput );
 565                 }
 566
 567                 # For the main page, overwrite the <title> element with the con-
 568                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 569                 # that's not empty).
 570                 # This message always exists because it is in the i18n files
 571                 if ( $this->getTitle()->isMainPage() ) {
 572                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 573                         if ( !$msg->isDisabled() ) {
 574                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 575                         }
 576                 }
 577
 578                 # Check for any __NOINDEX__ tags on the page using $pOutput
 579                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 580                 $wgOut->setIndexPolicy( $policy['index'] );
 581                 $wgOut->setFollowPolicy( $policy['follow'] );
 582
 583                 $this->showViewFooter();
 584                 $this->mPage->viewUpdates();
 585
 586                 wfProfileOut( __METHOD__ );
 587         }
 588
 589         /**
 590          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 591          * @param $pOutput ParserOutput
 592          */
 593         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 594                 global $wgOut;
 595                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 596                 $titleText = $pOutput->getTitleText();
 597                 if ( strval( $titleText ) !== '' ) {
 598                         $wgOut->setPageTitle( $titleText );
 599                 }
 600         }
 601
 602         /**
 603          * Show a diff page according to current request variables. For use within
 604          * Article::view() only, other callers should use the DifferenceEngine class.
 605          */
 606         public function showDiffPage() {
 607                 global $wgRequest, $wgUser;
 608
 609                 $diff = $wgRequest->getVal( 'diff' );
 610                 $rcid = $wgRequest->getVal( 'rcid' );
 611                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 612                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 613                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 614                 $oldid = $this->getOldID();
 615
 616                 $de = new DifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 617                 // DifferenceEngine directly fetched the revision:
 618                 $this->mRevIdFetched = $de->mNewid;
 619                 $de->showDiffPage( $diffOnly );
 620
 621                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 622                         # Run view updates for current revision only
 623                         $this->mPage->viewUpdates();
 624                 }
 625         }
 626
 627         /**
 628          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 629          * Article::view() only.
 630          *
 631          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 632          * page views.
 633          */
 634         protected function showCssOrJsPage() {
 635                 global $wgOut;
 636
 637                 $dir = $this->getContext()->getLang()->getDir();
 638                 $lang = $this->getContext()->getLang()->getCode();
 639
 640                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 641                         'clearyourcache' );
 642
 643                 // Give hooks a chance to customise the output
 644                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 645                         // Wrap the whole lot in a <pre> and don't parse
 646                         $m = array();
 647                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 648                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 649                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 650                         $wgOut->addHTML( "\n</pre>\n" );
 651                 }
 652         }
 653
 654         /**
 655          * Get the robot policy to be used for the current view
 656          * @param $action String the action= GET parameter
 657          * @param $pOutput ParserOutput
 658          * @return Array the policy that should be set
 659          * TODO: actions other than 'view'
 660          */
 661         public function getRobotPolicy( $action, $pOutput ) {
 662                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 663                 global $wgDefaultRobotPolicy, $wgRequest;
 664
 665                 $ns = $this->getTitle()->getNamespace();
 666
 667                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 668                         # Don't index user and user talk pages for blocked users (bug 11443)
 669                         if ( !$this->getTitle()->isSubpage() ) {
 670                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 671                                         return array(
 672                                                 'index'  => 'noindex',
 673                                                 'follow' => 'nofollow'
 674                                         );
 675                                 }
 676                         }
 677                 }
 678
 679                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 680                         # Non-articles (special pages etc), and old revisions
 681                         return array(
 682                                 'index'  => 'noindex',
 683                                 'follow' => 'nofollow'
 684                         );
 685                 } elseif ( $wgOut->isPrintable() ) {
 686                         # Discourage indexing of printable versions, but encourage following
 687                         return array(
 688                                 'index'  => 'noindex',
 689                                 'follow' => 'follow'
 690                         );
 691                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 692                         # For ?curid=x urls, disallow indexing
 693                         return array(
 694                                 'index'  => 'noindex',
 695                                 'follow' => 'follow'
 696                         );
 697                 }
 698
 699                 # Otherwise, construct the policy based on the various config variables.
 700                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 701
 702                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 703                         # Honour customised robot policies for this namespace
 704                         $policy = array_merge(
 705                                 $policy,
 706                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 707                         );
 708                 }
 709                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 710                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 711                         # a final sanity check that we have really got the parser output.
 712                         $policy = array_merge(
 713                                 $policy,
 714                                 array( 'index' => $pOutput->getIndexPolicy() )
 715                         );
 716                 }
 717
 718                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 719                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 720                         $policy = array_merge(
 721                                 $policy,
 722                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 723                         );
 724                 }
 725
 726                 return $policy;
 727         }
 728
 729         /**
 730          * Converts a String robot policy into an associative array, to allow
 731          * merging of several policies using array_merge().
 732          * @param $policy Mixed, returns empty array on null/false/'', transparent
 733          *            to already-converted arrays, converts String.
 734          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 735          */
 736         public static function formatRobotPolicy( $policy ) {
 737                 if ( is_array( $policy ) ) {
 738                         return $policy;
 739                 } elseif ( !$policy ) {
 740                         return array();
 741                 }
 742
 743                 $policy = explode( ',', $policy );
 744                 $policy = array_map( 'trim', $policy );
 745
 746                 $arr = array();
 747                 foreach ( $policy as $var ) {
 748                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 749                                 $arr['index'] = $var;
 750                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 751                                 $arr['follow'] = $var;
 752                         }
 753                 }
 754
 755                 return $arr;
 756         }
 757
 758         /**
 759          * If this request is a redirect view, send "redirected from" subtitle to
 760          * $wgOut. Returns true if the header was needed, false if this is not a
 761          * redirect view. Handles both local and remote redirects.
 762          *
 763          * @return boolean
 764          */
 765         public function showRedirectedFromHeader() {
 766                 global $wgOut, $wgRequest, $wgRedirectSources;
 767
 768                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 769
 770                 if ( isset( $this->mRedirectedFrom ) ) {
 771                         // This is an internally redirected page view.
 772                         // We'll need a backlink to the source page for navigation.
 773                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 774                                 $redir = Linker::linkKnown(
 775                                         $this->mRedirectedFrom,
 776                                         null,
 777                                         array(),
 778                                         array( 'redirect' => 'no' )
 779                                 );
 780
 781                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 782
 783                                 // Set the fragment if one was specified in the redirect
 784                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 785                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 786                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 787                                 }
 788
 789                                 // Add a <link rel="canonical"> tag
 790                                 $wgOut->addLink( array( 'rel' => 'canonical',
 791                                         'href' => $this->getTitle()->getLocalURL() )
 792                                 );
 793
 794                                 return true;
 795                         }
 796                 } elseif ( $rdfrom ) {
 797                         // This is an externally redirected view, from some other wiki.
 798                         // If it was reported from a trusted site, supply a backlink.
 799                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 800                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 801                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 802
 803                                 return true;
 804                         }
 805                 }
 806
 807                 return false;
 808         }
 809
 810         /**
 811          * Show a header specific to the namespace currently being viewed, like
 812          * [[MediaWiki:Talkpagetext]]. For Article::view().
 813          */
 814         public function showNamespaceHeader() {
 815                 global $wgOut;
 816
 817                 if ( $this->getTitle()->isTalkPage() ) {
 818                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 819                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 820                         }
 821                 }
 822         }
 823
 824         /**
 825          * Show the footer section of an ordinary page view
 826          */
 827         public function showViewFooter() {
 828                 global $wgOut, $wgUseTrackbacks;
 829
 830                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 831                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 832                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 833                 }
 834
 835                 # If we have been passed an &rcid= parameter, we want to give the user a
 836                 # chance to mark this new article as patrolled.
 837                 $this->showPatrolFooter();
 838
 839                 # Trackbacks
 840                 if ( $wgUseTrackbacks ) {
 841                         $this->addTrackbacks();
 842                 }
 843
 844                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 845
 846         }
 847
 848         /**
 849          * If patrol is possible, output a patrol UI box. This is called from the
 850          * footer section of ordinary page views. If patrol is not possible or not
 851          * desired, does nothing.
 852          */
 853         public function showPatrolFooter() {
 854                 global $wgOut, $wgRequest, $wgUser;
 855
 856                 $rcid = $wgRequest->getVal( 'rcid' );
 857
 858                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 859                         return;
 860                 }
 861
 862                 $token = $wgUser->editToken( $rcid );
 863                 $wgOut->preventClickjacking();
 864
 865                 $wgOut->addHTML(
 866                         "<div class='patrollink'>" .
 867                                 wfMsgHtml(
 868                                         'markaspatrolledlink',
 869                                         Linker::link(
 870                                                 $this->getTitle(),
 871                                                 wfMsgHtml( 'markaspatrolledtext' ),
 872                                                 array(),
 873                                                 array(
 874                                                         'action' => 'markpatrolled',
 875                                                         'rcid' => $rcid,
 876                                                         'token' => $token,
 877                                                 ),
 878                                                 array( 'known', 'noclasses' )
 879                                         )
 880                                 ) .
 881                         '</div>'
 882                 );
 883         }
 884
 885         /**
 886          * Show the error text for a missing article. For articles in the MediaWiki
 887          * namespace, show the default message text. To be called from Article::view().
 888          */
 889         public function showMissingArticle() {
 890                 global $wgOut, $wgRequest, $wgUser;
 891
 892                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 893                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 894                         $parts = explode( '/', $this->getTitle()->getText() );
 895                         $rootPart = $parts[0];
 896                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 897                         $ip = User::isIP( $rootPart );
 898
 899                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
 900                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 901                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 902                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 903                                 LogEventsList::showLogExtract(
 904                                         $wgOut,
 905                                         'block',
 906                                         $user->getUserPage()->getPrefixedText(),
 907                                         '',
 908                                         array(
 909                                                 'lim' => 1,
 910                                                 'showIfEmpty' => false,
 911                                                 'msgKey' => array(
 912                                                         'blocked-notice-logextract',
 913                                                         $user->getName() # Support GENDER in notice
 914                                                 )
 915                                         )
 916                                 );
 917                         }
 918                 }
 919
 920                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 921
 922                 # Show delete and move logs
 923                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 924                         array(  'lim' => 10,
 925                                 'conds' => array( "log_action != 'revision'" ),
 926                                 'showIfEmpty' => false,
 927                                 'msgKey' => array( 'moveddeleted-notice' ) )
 928                 );
 929
 930                 # Show error message
 931                 $oldid = $this->getOldID();
 932                 if ( $oldid ) {
 933                         $text = wfMsgNoTrans( 'missing-article',
 934                                 $this->getTitle()->getPrefixedText(),
 935                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 936                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 937                         // Use the default message text
 938                         $text = $this->getTitle()->getDefaultMessageText();
 939                 } else {
 940                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 941                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 942                         $errors = array_merge( $createErrors, $editErrors );
 943
 944                         if ( !count( $errors ) ) {
 945                                 $text = wfMsgNoTrans( 'noarticletext' );
 946                         } else {
 947                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 948                         }
 949                 }
 950                 $text = "<div class='noarticletext'>\n$text\n</div>";
 951
 952                 if ( !$this->mPage->hasViewableContent() ) {
 953                         // If there's no backing content, send a 404 Not Found
 954                         // for better machine handling of broken links.
 955                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
 956                 }
 957
 958                 $wgOut->addWikiText( $text );
 959         }
 960
 961         /**
 962          * If the revision requested for view is deleted, check permissions.
 963          * Send either an error message or a warning header to $wgOut.
 964          *
 965          * @return boolean true if the view is allowed, false if not.
 966          */
 967         public function showDeletedRevisionHeader() {
 968                 global $wgOut, $wgRequest;
 969
 970                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 971                         // Not deleted
 972                         return true;
 973                 }
 974
 975                 // If the user is not allowed to see it...
 976                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 977                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 978                                 'rev-deleted-text-permission' );
 979
 980                         return false;
 981                 // If the user needs to confirm that they want to see it...
 982                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
 983                         # Give explanation and add a link to view the revision...
 984                         $oldid = intval( $this->getOldID() );
 985                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
 986                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 987                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
 988                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 989                                 array( $msg, $link ) );
 990
 991                         return false;
 992                 // We are allowed to see...
 993                 } else {
 994                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 995                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
 996                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
 997
 998                         return true;
 999                 }
1000         }
1001
1002         /**
1003          * Generate the navigation links when browsing through an article revisions
1004          * It shows the information as:
1005          *   Revision as of \<date\>; view current revision
1006          *   \<- Previous version | Next Version -\>
1007          *
1008          * @param $oldid String: revision ID of this article revision
1009          */
1010         public function setOldSubtitle( $oldid = 0 ) {
1011                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1012
1013                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1014                         return;
1015                 }
1016
1017                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1018
1019                 # Cascade unhide param in links for easy deletion browsing
1020                 $extraParams = array();
1021                 if ( $wgRequest->getVal( 'unhide' ) ) {
1022                         $extraParams['unhide'] = 1;
1023                 }
1024
1025                 $revision = Revision::newFromId( $oldid );
1026                 $timestamp = $revision->getTimestamp();
1027
1028                 $current = ( $oldid == $this->mPage->getLatest() );
1029                 $td = $wgLang->timeanddate( $timestamp, true );
1030                 $tddate = $wgLang->date( $timestamp, true );
1031                 $tdtime = $wgLang->time( $timestamp, true );
1032
1033                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1034                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1035
1036                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1037                         ? 'revision-info-current'
1038                         : 'revision-info';
1039
1040                 $wgOut->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1041                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1042                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1043
1044                 $lnk = $current
1045                         ? wfMsgHtml( 'currentrevisionlink' )
1046                         : Linker::link(
1047                                 $this->getTitle(),
1048                                 wfMsgHtml( 'currentrevisionlink' ),
1049                                 array(),
1050                                 $extraParams,
1051                                 array( 'known', 'noclasses' )
1052                         );
1053                 $curdiff = $current
1054                         ? wfMsgHtml( 'diff' )
1055                         : Linker::link(
1056                                 $this->getTitle(),
1057                                 wfMsgHtml( 'diff' ),
1058                                 array(),
1059                                 array(
1060                                         'diff' => 'cur',
1061                                         'oldid' => $oldid
1062                                 ) + $extraParams,
1063                                 array( 'known', 'noclasses' )
1064                         );
1065                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1066                 $prevlink = $prev
1067                         ? Linker::link(
1068                                 $this->getTitle(),
1069                                 wfMsgHtml( 'previousrevision' ),
1070                                 array(),
1071                                 array(
1072                                         'direction' => 'prev',
1073                                         'oldid' => $oldid
1074                                 ) + $extraParams,
1075                                 array( 'known', 'noclasses' )
1076                         )
1077                         : wfMsgHtml( 'previousrevision' );
1078                 $prevdiff = $prev
1079                         ? Linker::link(
1080                                 $this->getTitle(),
1081                                 wfMsgHtml( 'diff' ),
1082                                 array(),
1083                                 array(
1084                                         'diff' => 'prev',
1085                                         'oldid' => $oldid
1086                                 ) + $extraParams,
1087                                 array( 'known', 'noclasses' )
1088                         )
1089                         : wfMsgHtml( 'diff' );
1090                 $nextlink = $current
1091                         ? wfMsgHtml( 'nextrevision' )
1092                         : Linker::link(
1093                                 $this->getTitle(),
1094                                 wfMsgHtml( 'nextrevision' ),
1095                                 array(),
1096                                 array(
1097                                         'direction' => 'next',
1098                                         'oldid' => $oldid
1099                                 ) + $extraParams,
1100                                 array( 'known', 'noclasses' )
1101                         );
1102                 $nextdiff = $current
1103                         ? wfMsgHtml( 'diff' )
1104                         : Linker::link(
1105                                 $this->getTitle(),
1106                                 wfMsgHtml( 'diff' ),
1107                                 array(),
1108                                 array(
1109                                         'diff' => 'next',
1110                                         'oldid' => $oldid
1111                                 ) + $extraParams,
1112                                 array( 'known', 'noclasses' )
1113                         );
1114
1115                 $cdel = '';
1116
1117                 // User can delete revisions or view deleted revisions...
1118                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1119                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1120                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
1121                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
1122                         } else {
1123                                 $query = array(
1124                                         'type'   => 'revision',
1125                                         'target' => $this->getTitle()->getPrefixedDbkey(),
1126                                         'ids'    => $oldid
1127                                 );
1128                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1129                         }
1130                         $cdel .= ' ';
1131                 }
1132
1133                 $wgOut->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1134                         wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1135                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>" );
1136         }
1137
1138         /**
1139          * Execute the uncached parse for action=view
1140          * @return bool
1141          */
1142         public function doViewParse() {
1143                 global $wgOut;
1144
1145                 $oldid = $this->getOldID();
1146                 $parserOptions = $this->getParserOptions();
1147
1148                 # Render printable version, use printable version cache
1149                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1150
1151                 # Don't show section-edit links on old revisions... this way lies madness.
1152                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
1153                         $parserOptions->setEditSection( false );
1154                 }
1155
1156                 $useParserCache = $this->useParserCache( $oldid );
1157                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1158
1159                 return true;
1160         }
1161
1162         /**
1163          * Try to fetch an expired entry from the parser cache. If it is present,
1164          * output it and return true. If it is not present, output nothing and
1165          * return false. This is used as a callback function for
1166          * PoolCounter::executeProtected().
1167          *
1168          * @return boolean
1169          */
1170         public function tryDirtyCache() {
1171                 global $wgOut;
1172                 $parserCache = ParserCache::singleton();
1173                 $options = $this->getParserOptions();
1174
1175                 if ( $wgOut->isPrintable() ) {
1176                         $options->setIsPrintable( true );
1177                         $options->setEditSection( false );
1178                 }
1179
1180                 $output = $parserCache->getDirty( $this, $options );
1181
1182                 if ( $output ) {
1183                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1184                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1185                         $wgOut->setSquidMaxage( 0 );
1186                         $this->mParserOutput = $output;
1187                         $wgOut->addParserOutput( $output );
1188                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1189
1190                         return true;
1191                 } else {
1192                         wfDebugLog( 'dirty', "dirty missing\n" );
1193                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1194
1195                         return false;
1196                 }
1197         }
1198
1199         /**
1200          * View redirect
1201          *
1202          * @param $target Title|Array of destination(s) to redirect
1203          * @param $appendSubtitle Boolean [optional]
1204          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1205          * @return string containing HMTL with redirect link
1206          */
1207         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1208                 global $wgOut, $wgStylePath;
1209
1210                 if ( !is_array( $target ) ) {
1211                         $target = array( $target );
1212                 }
1213
1214                 $lang = $this->getTitle()->getPageLanguage();
1215                 $imageDir = $lang->getDir();
1216
1217                 if ( $appendSubtitle ) {
1218                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1219                 }
1220
1221                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1222
1223                 /**
1224                  * @var $title Title
1225                  */
1226                 $title = array_shift( $target );
1227
1228                 if ( $forceKnown ) {
1229                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1230                 } else {
1231                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1232                 }
1233
1234                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1235                 $alt = $lang->isRTL() ? '←' : '→';
1236                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1237                 foreach ( $target as $rt ) {
1238                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1239                         if ( $forceKnown ) {
1240                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1241                         } else {
1242                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1243                         }
1244                 }
1245
1246                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1247                 return '<div class="redirectMsg">' .
1248                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1249                         '<span class="redirectText">' . $link . '</span></div>';
1250         }
1251
1252         /**
1253          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1254          */
1255         public function addTrackbacks() {
1256                 global $wgOut;
1257
1258                 $dbr = wfGetDB( DB_SLAVE );
1259                 $tbs = $dbr->select( 'trackbacks',
1260                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1261                         array( 'tb_page' => $this->mPage->getID() )
1262                 );
1263
1264                 if ( !$dbr->numRows( $tbs ) ) {
1265                         return;
1266                 }
1267
1268                 $wgOut->preventClickjacking();
1269
1270                 $tbtext = "";
1271                 foreach ( $tbs as $o ) {
1272                         $rmvtxt = "";
1273
1274                         if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
1275                                 $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
1276                                         $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->editToken() ) );
1277                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1278                         }
1279
1280                         $tbtext .= "\n";
1281                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1282                                         $o->tb_title,
1283                                         $o->tb_url,
1284                                         $o->tb_ex,
1285                                         $o->tb_name,
1286                                         $rmvtxt );
1287                 }
1288
1289                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1290         }
1291
1292         /**
1293          * Handle action=render
1294          */
1295         public function render() {
1296                 global $wgOut;
1297
1298                 $wgOut->setArticleBodyOnly( true );
1299                 $this->view();
1300         }
1301
1302         /**
1303          * action=protect handler
1304          */
1305         public function protect() {
1306                 $form = new ProtectionForm( $this );
1307                 $form->execute();
1308         }
1309
1310         /**
1311          * action=unprotect handler (alias)
1312          */
1313         public function unprotect() {
1314                 $this->protect();
1315         }
1316
1317         /**
1318          * UI entry point for page deletion
1319          */
1320         public function delete() {
1321                 global $wgOut, $wgRequest, $wgLang;
1322
1323                 # This code desperately needs to be totally rewritten
1324
1325                 $title = $this->getTitle();
1326                 $user = $this->getContext()->getUser();
1327
1328                 # Check permissions
1329                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1330                 if ( count( $permission_errors ) ) {
1331                         throw new PermissionsError( 'delete', $permission_errors );
1332                 }
1333
1334                 # Read-only check...
1335                 if ( wfReadOnly() ) {
1336                         throw new ReadOnlyError;
1337                 }
1338
1339                 # Better double-check that it hasn't been deleted yet!
1340                 $dbw = wfGetDB( DB_MASTER );
1341                 $conds = $title->pageCond();
1342                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1343                 if ( $latest === false ) {
1344                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1345                         $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1346                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1347                                 );
1348                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1349                         LogEventsList::showLogExtract(
1350                                 $wgOut,
1351                                 'delete',
1352                                 $title->getPrefixedText()
1353                         );
1354
1355                         return;
1356                 }
1357
1358                 # Hack for big sites
1359                 $bigHistory = $this->mPage->isBigDeletion();
1360                 if ( $bigHistory && !$title->userCan( 'bigdelete' ) ) {
1361                         global $wgDeleteRevisionsLimit;
1362
1363                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1364                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1365                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1366
1367                         return;
1368                 }
1369
1370                 $deleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1371                 $deleteReason = $wgRequest->getText( 'wpReason' );
1372
1373                 if ( $deleteReasonList == 'other' ) {
1374                         $reason = $deleteReason;
1375                 } elseif ( $deleteReason != '' ) {
1376                         // Entry from drop down menu + additional comment
1377                         $reason = $deleteReasonList . wfMsgForContent( 'colon-separator' ) . $deleteReason;
1378                 } else {
1379                         $reason = $deleteReasonList;
1380                 }
1381
1382                 if ( $wgRequest->wasPosted() && $user->matchEditToken( $wgRequest->getVal( 'wpEditToken' ),
1383                         array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
1384                 {
1385                         # Flag to hide all contents of the archived revisions
1386                         $suppress = $wgRequest->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1387
1388                         $this->doDelete( $reason, $suppress );
1389
1390                         if ( $wgRequest->getCheck( 'wpWatch' ) && $user->isLoggedIn() ) {
1391                                 $this->doWatch();
1392                         } elseif ( $title->userIsWatching() ) {
1393                                 $this->doUnwatch();
1394                         }
1395
1396                         return;
1397                 }
1398
1399                 // Generate deletion reason
1400                 $hasHistory = false;
1401                 if ( !$reason ) {
1402                         $reason = $this->generateReason( $hasHistory );
1403                 }
1404
1405                 // If the page has a history, insert a warning
1406                 if ( $hasHistory ) {
1407                         $revisions = $this->mPage->estimateRevisionCount();
1408                         // @todo FIXME: i18n issue/patchwork message
1409                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1410                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1411                                 wfMsgHtml( 'word-separator' ) . Linker::link( $title,
1412                                         wfMsgHtml( 'history' ),
1413                                         array( 'rel' => 'archives' ),
1414                                         array( 'action' => 'history' ) ) .
1415                                 '</strong>'
1416                         );
1417
1418                         if ( $bigHistory ) {
1419                                 global $wgDeleteRevisionsLimit;
1420                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1421                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1422                         }
1423                 }
1424
1425                 return $this->confirmDelete( $reason );
1426         }
1427
1428         /**
1429          * Output deletion confirmation dialog
1430          * @todo FIXME: Move to another file?
1431          * @param $reason String: prefilled reason
1432          */
1433         public function confirmDelete( $reason ) {
1434                 global $wgOut;
1435
1436                 wfDebug( "Article::confirmDelete\n" );
1437
1438                 $wgOut->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1439                 $wgOut->addBacklinkSubtitle( $this->getTitle() );
1440                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1441                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1442
1443                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1444
1445                 $user = $this->getContext()->getUser();
1446
1447                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1448                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1449                                         <td></td>
1450                                         <td class='mw-input'><strong>" .
1451                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1452                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1453                                         "</strong></td>
1454                                 </tr>";
1455                 } else {
1456                         $suppress = '';
1457                 }
1458                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1459
1460                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1461                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1462                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1463                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1464                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1465                         "<tr id=\"wpDeleteReasonListRow\">
1466                                 <td class='mw-label'>" .
1467                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1468                                 "</td>
1469                                 <td class='mw-input'>" .
1470                                         Xml::listDropDown( 'wpDeleteReasonList',
1471                                                 wfMsgForContent( 'deletereason-dropdown' ),
1472                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1473                                 "</td>
1474                         </tr>
1475                         <tr id=\"wpDeleteReasonRow\">
1476                                 <td class='mw-label'>" .
1477                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1478                                 "</td>
1479                                 <td class='mw-input'>" .
1480                                 Html::input( 'wpReason', $reason, 'text', array(
1481                                         'size' => '60',
1482                                         'maxlength' => '255',
1483                                         'tabindex' => '2',
1484                                         'id' => 'wpReason',
1485                                         'autofocus'
1486                                 ) ) .
1487                                 "</td>
1488                         </tr>";
1489
1490                 # Disallow watching if user is not logged in
1491                 if ( $user->isLoggedIn() ) {
1492                         $form .= "
1493                         <tr>
1494                                 <td></td>
1495                                 <td class='mw-input'>" .
1496                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1497                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1498                                 "</td>
1499                         </tr>";
1500                 }
1501
1502                 $form .= "
1503                         $suppress
1504                         <tr>
1505                                 <td></td>
1506                                 <td class='mw-submit'>" .
1507                                         Xml::submitButton( wfMsg( 'deletepage' ),
1508                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1509                                 "</td>
1510                         </tr>" .
1511                         Xml::closeElement( 'table' ) .
1512                         Xml::closeElement( 'fieldset' ) .
1513                         Html::hidden( 'wpEditToken', $user->editToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1514                         Xml::closeElement( 'form' );
1515
1516                         if ( $user->isAllowed( 'editinterface' ) ) {
1517                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1518                                 $link = Linker::link(
1519                                         $title,
1520                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1521                                         array(),
1522                                         array( 'action' => 'edit' )
1523                                 );
1524                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1525                         }
1526
1527                 $wgOut->addHTML( $form );
1528                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1529                 LogEventsList::showLogExtract( $wgOut, 'delete',
1530                         $this->getTitle()->getPrefixedText()
1531                 );
1532         }
1533
1534         /**
1535          * Perform a deletion and output success or failure messages
1536          * @param $reason
1537          * @param $suppress bool
1538          */
1539         public function doDelete( $reason, $suppress = false ) {
1540                 global $wgOut;
1541
1542                 $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );
1543
1544                 $error = '';
1545                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, true, $error ) ) {
1546                         $deleted = $this->getTitle()->getPrefixedText();
1547
1548                         $wgOut->setPageTitle( wfMessage( 'actioncomplete' ) );
1549                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1550
1551                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1552
1553                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1554                         $wgOut->returnToMain( false );
1555                 } else {
1556                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1557                         if ( $error == '' ) {
1558                                 $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1559                                         array( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1560                                 );
1561                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1562
1563                                 LogEventsList::showLogExtract(
1564                                         $wgOut,
1565                                         'delete',
1566                                         $this->getTitle()->getPrefixedText()
1567                                 );
1568                         } else {
1569                                 $wgOut->addHTML( $error );
1570                         }
1571                 }
1572         }
1573
1574         /* Caching functions */
1575
1576         /**
1577          * checkLastModified returns true if it has taken care of all
1578          * output to the client that is necessary for this request.
1579          * (that is, it has sent a cached version of the page)
1580          *
1581          * @return boolean true if cached version send, false otherwise
1582          */
1583         protected function tryFileCache() {
1584                 static $called = false;
1585
1586                 if ( $called ) {
1587                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1588                         return false;
1589                 }
1590
1591                 $called = true;
1592                 if ( $this->isFileCacheable() ) {
1593                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1594                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1595                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1596                                 $cache->loadFromFileCache( $this->getContext() );
1597                                 return true;
1598                         } else {
1599                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1600                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1601                         }
1602                 } else {
1603                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1604                 }
1605
1606                 return false;
1607         }
1608
1609         /**
1610          * Check if the page can be cached
1611          * @return bool
1612          */
1613         public function isFileCacheable() {
1614                 $cacheable = false;
1615
1616                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1617                         $cacheable = $this->mPage->getID()
1618                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1619                         // Extension may have reason to disable file caching on some pages.
1620                         if ( $cacheable ) {
1621                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1622                         }
1623                 }
1624
1625                 return $cacheable;
1626         }
1627
1628         /**#@-*/
1629
1630         /**
1631          * Add the primary page-view wikitext to the output buffer
1632          * Saves the text into the parser cache if possible.
1633          * Updates templatelinks if it is out of date.
1634          *
1635          * @param $text String
1636          * @param $cache Boolean
1637          * @param $parserOptions mixed ParserOptions object, or boolean false
1638          */
1639         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
1640                 global $wgOut;
1641
1642                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
1643
1644                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
1645
1646                 $wgOut->addParserOutput( $this->mParserOutput );
1647         }
1648
1649         /**
1650          * Lightweight method to get the parser output for a page, checking the parser cache
1651          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1652          * consider, so it's not appropriate to use there.
1653          *
1654          * @since 1.16 (r52326) for LiquidThreads
1655          *
1656          * @param $oldid mixed integer Revision ID or null
1657          * @param $user User The relevant user
1658          * @return ParserOutput or false if the given revsion ID is not found
1659          */
1660         public function getParserOutput( $oldid = null, User $user = null ) {
1661                 global $wgEnableParserCache, $wgUser;
1662                 $user = is_null( $user ) ? $wgUser : $user;
1663
1664                 wfProfileIn( __METHOD__ );
1665                 // Should the parser cache be used?
1666                 $useParserCache = $wgEnableParserCache &&
1667                         $user->getStubThreshold() == 0 &&
1668                         $this->mPage->exists() &&
1669                         $oldid === null;
1670
1671                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1672
1673                 if ( $user->getStubThreshold() ) {
1674                         wfIncrStats( 'pcache_miss_stub' );
1675                 }
1676
1677                 if ( $useParserCache ) {
1678                         $options = $this->mPage->makeParserOptions( $user );
1679                         $parserOutput = ParserCache::singleton()->get( $this, $options );
1680                         if ( $parserOutput !== false ) {
1681                                 wfProfileOut( __METHOD__ );
1682                                 return $parserOutput;
1683                         }
1684                 }
1685
1686                 // Cache miss; parse and output it.
1687                 if ( $oldid === null ) {
1688                         $text = $this->mPage->getRawText();
1689                 } else {
1690                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
1691                         if ( $rev === null ) {
1692                                 wfProfileOut( __METHOD__ );
1693                                 return false;
1694                         }
1695                         $text = $rev->getText();
1696                 }
1697
1698                 $output = $this->getOutputFromWikitext( $text, $useParserCache );
1699                 wfProfileOut( __METHOD__ );
1700                 return $output;
1701         }
1702
1703         /**
1704          * This does all the heavy lifting for outputWikitext, except it returns the parser
1705          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
1706          * say, embedding thread pages within a discussion system (LiquidThreads)
1707          *
1708          * @param $text string
1709          * @param $cache boolean
1710          * @param $parserOptions parsing options, defaults to false
1711          * @return ParserOutput
1712          */
1713         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
1714                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
1715
1716                 if ( !$parserOptions ) {
1717                         $parserOptions = $this->getParserOptions();
1718                 }
1719
1720                 $time = - wfTime();
1721                 $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
1722                         $parserOptions, true, true, $this->getRevIdFetched() );
1723                 $time += wfTime();
1724
1725                 # Timing hack
1726                 if ( $time > 3 ) {
1727                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1728                                 $this->getTitle()->getPrefixedDBkey() ) );
1729                 }
1730
1731                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
1732                         $parserCache = ParserCache::singleton();
1733                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
1734                 }
1735
1736                 // Make sure file cache is not used on uncacheable content.
1737                 // Output that has magic words in it can still use the parser cache
1738                 // (if enabled), though it will generally expire sooner.
1739                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
1740                         $wgUseFileCache = false;
1741                 }
1742
1743                 if ( $this->isCurrent() ) {
1744                         $this->mPage->doCascadeProtectionUpdates( $this->mParserOutput );
1745                 }
1746
1747                 return $this->mParserOutput;
1748         }
1749
1750         /**
1751          * Get parser options suitable for rendering the primary article wikitext
1752          * @return ParserOptions|false
1753          */
1754         public function getParserOptions() {
1755                 global $wgUser;
1756                 if ( !$this->mParserOptions ) {
1757                         $this->mParserOptions = $this->mPage->makeParserOptions( $wgUser );
1758                 }
1759                 // Clone to allow modifications of the return value without affecting cache
1760                 return clone $this->mParserOptions;
1761         }
1762
1763         /**
1764          * Sets the context this Article is executed in
1765          *
1766          * @param $context IContextSource
1767          * @since 1.18
1768          */
1769         public function setContext( $context ) {
1770                 $this->mContext = $context;
1771         }
1772
1773         /**
1774          * Gets the context this Article is executed in
1775          *
1776          * @return IContextSource
1777          * @since 1.18
1778          */
1779         public function getContext() {
1780                 if ( $this->mContext instanceof IContextSource ) {
1781                         return $this->mContext;
1782                 } else {
1783                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1784                         return RequestContext::getMain();
1785                 }
1786         }
1787
1788         /**
1789          * Removes trackback record for current article from trackbacks table
1790          * @deprecated since 1.18
1791          */
1792         public function deletetrackback() {
1793                 return Action::factory( 'deletetrackback', $this )->show();
1794         }
1795
1796         /**
1797          * Info about this page
1798          * @deprecated since 1.19
1799          */
1800         public function info() {
1801                 Action::factory( 'info', $this )->show();
1802         }
1803
1804         /**
1805          * Mark this particular edit/page as patrolled
1806          * @deprecated since 1.18
1807          */
1808         public function markpatrolled() {
1809                 Action::factory( 'markpatrolled', $this )->show();
1810         }
1811
1812         /**
1813          * Handle action=purge
1814          * @deprecated since 1.19
1815          */
1816         public function purge() {
1817                 return Action::factory( 'purge', $this )->show();
1818         }
1819
1820         /**
1821          * Handle action=revert
1822          * @deprecated since 1.19
1823          */
1824         public function revert() {
1825                 Action::factory( 'revert', $this )->show();
1826         }
1827
1828         /**
1829          * Handle action=rollback
1830          * @deprecated since 1.19
1831          */
1832         public function rollback() {
1833                 Action::factory( 'rollback', $this )->show();
1834         }
1835
1836         /**
1837          * User-interface handler for the "watch" action.
1838          * Requires Request to pass a token as of 1.18.
1839          * @deprecated since 1.18
1840          */
1841         public function watch() {
1842                 Action::factory( 'watch', $this )->show();
1843         }
1844
1845         /**
1846          * Add this page to $wgUser's watchlist
1847          *
1848          * This is safe to be called multiple times
1849          *
1850          * @return bool true on successful watch operation
1851          * @deprecated since 1.18
1852          */
1853         public function doWatch() {
1854                 global $wgUser;
1855                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1856         }
1857
1858         /**
1859          * User interface handler for the "unwatch" action.
1860          * Requires Request to pass a token as of 1.18.
1861          * @deprecated since 1.18
1862          */
1863         public function unwatch() {
1864                 Action::factory( 'unwatch', $this )->show();
1865         }
1866
1867         /**
1868          * Stop watching a page
1869          * @return bool true on successful unwatch
1870          * @deprecated since 1.18
1871          */
1872         public function doUnwatch() {
1873                 global $wgUser;
1874                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1875         }
1876
1877         /**
1878          * Output a redirect back to the article.
1879          * This is typically used after an edit.
1880          *
1881          * @deprecated in 1.18; call $wgOut->redirect() directly
1882          * @param $noRedir Boolean: add redirect=no
1883          * @param $sectionAnchor String: section to redirect to, including "#"
1884          * @param $extraQuery String: extra query params
1885          */
1886         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1887                 wfDeprecated( __METHOD__ );
1888                 global $wgOut;
1889
1890                 if ( $noRedir ) {
1891                         $query = 'redirect=no';
1892                         if ( $extraQuery )
1893                                 $query .= "&$extraQuery";
1894                 } else {
1895                         $query = $extraQuery;
1896                 }
1897
1898                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1899         }
1900
1901         /**
1902          * Use PHP's magic __get handler to handle accessing of
1903          * raw WikiPage fields for backwards compatibility.
1904          *
1905          * @param $fname String Field name
1906          */
1907         public function __get( $fname ) {
1908                 if ( property_exists( $this->mPage, $fname ) ) {
1909                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1910                         return $this->mPage->$fname;
1911                 }
1912                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1913         }
1914
1915         /**
1916          * Use PHP's magic __set handler to handle setting of
1917          * raw WikiPage fields for backwards compatibility.
1918          *
1919          * @param $fname String Field name
1920          * @param $fvalue mixed New value
1921          */
1922         public function __set( $fname, $fvalue ) {
1923                 if ( property_exists( $this->mPage, $fname ) ) {
1924                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1925                         $this->mPage->$fname = $fvalue;
1926                 // Note: extensions may want to toss on new fields
1927                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1928                         $this->mPage->$fname = $fvalue;
1929                 } else {
1930                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1931                 }
1932         }
1933
1934         /**
1935          * Use PHP's magic __call handler to transform instance calls to
1936          * WikiPage functions for backwards compatibility.
1937          *
1938          * @param $fname String Name of called method
1939          * @param $args Array Arguments to the method
1940          */
1941         public function __call( $fname, $args ) {
1942                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1943                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1944                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1945                 }
1946                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1947         }
1948
1949         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1950
1951         /**
1952          * @param $limit array
1953          * @param $reason string
1954          * @param $cascade int
1955          * @param $expiry array
1956          * @return bool
1957          */
1958         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1959                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
1960         }
1961
1962         /**
1963          * @param $reason string
1964          * @param $suppress bool
1965          * @param $id int
1966          * @param $commit bool
1967          * @param $error string
1968          * @return bool
1969          */
1970         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
1971                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
1972         }
1973
1974         /**
1975          * @param $fromP
1976          * @param $summary
1977          * @param $token
1978          * @param $bot
1979          * @param $resultDetails
1980          * @param $user User
1981          * @return array
1982          */
1983         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
1984                 global $wgUser;
1985                 $user = is_null( $user ) ? $wgUser : $user;
1986                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
1987         }
1988
1989         /**
1990          * @param $fromP
1991          * @param $summary
1992          * @param $bot
1993          * @param $resultDetails
1994          * @param $guser User
1995          * @return array
1996          */
1997         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
1998                 global $wgUser;
1999                 $guser = is_null( $guser ) ? $wgUser : $guser;
2000                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2001         }
2002
2003         /**
2004          * @param $hasHistory bool
2005          * @return mixed
2006          */
2007         public function generateReason( &$hasHistory ) {
2008                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2009         }
2010
2011         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2012
2013         /**
2014          * @return array
2015          */
2016         public static function selectFields() {
2017                 return WikiPage::selectFields();
2018         }
2019
2020         /**
2021          * @param $title Title
2022          */
2023         public static function onArticleCreate( $title ) {
2024                 WikiPage::onArticleCreate( $title );
2025         }
2026
2027         /**
2028          * @param $title Title
2029          */
2030         public static function onArticleDelete( $title ) {
2031                 WikiPage::onArticleDelete( $title );
2032         }
2033
2034         /**
2035          * @param $title Title
2036          */
2037         public static function onArticleEdit( $title ) {
2038                 WikiPage::onArticleEdit( $title );
2039         }
2040
2041         /**
2042          * @param $oldtext
2043          * @param $newtext
2044          * @param $flags
2045          * @return string
2046          */
2047         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2048                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2049         }
2050         // ******
2051 }
2052
2053 class PoolWorkArticleView extends PoolCounterWork {
2054
2055         /**
2056          * @var Article
2057          */
2058         private $mArticle;
2059
2060         function __construct( $article, $key, $useParserCache, $parserOptions ) {
2061                 parent::__construct( 'ArticleView', $key );
2062                 $this->mArticle = $article;
2063                 $this->cacheable = $useParserCache;
2064                 $this->parserOptions = $parserOptions;
2065         }
2066
2067         /**
2068          * @return bool
2069          */
2070         function doWork() {
2071                 return $this->mArticle->doViewParse();
2072         }
2073
2074         /**
2075          * @return bool
2076          */
2077         function getCachedWork() {
2078                 global $wgOut;
2079
2080                 $parserCache = ParserCache::singleton();
2081                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
2082
2083                 if ( $this->mArticle->mParserOutput !== false ) {
2084                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
2085                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
2086                         # Ensure that UI elements requiring revision ID have
2087                         # the correct version information.
2088                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
2089                         return true;
2090                 }
2091                 return false;
2092         }
2093
2094         /**
2095          * @return bool
2096          */
2097         function fallback() {
2098                 return $this->mArticle->tryDirtyCache();
2099         }
2100
2101         /**
2102          * @param $status Status
2103          */
2104         function error( $status ) {
2105                 global $wgOut;
2106
2107                 $wgOut->clearHTML(); // for release() errors
2108                 $wgOut->enableClientCache( false );
2109                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2110
2111                 $errortext = $status->getWikiText( false, 'view-pool-error' );
2112                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
2113
2114                 return false;
2115         }
2116 }