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 RequestContext
  27          */
  28         protected $mContext;
  29
  30         /**
  31          * @var WikiPage
  32          */
  33         protected $mPage;
  34
  35         var $mContent;                    // !<
  36         var $mContentLoaded = false;      // !<
  37         var $mOldId;                      // !<
  38
  39         /**
  40          * @var Title
  41          */
  42         var $mRedirectedFrom = null;
  43
  44         /**
  45          * @var mixed: boolean false or URL string
  46          */
  47         var $mRedirectUrl = false;        // !<
  48         var $mRevIdFetched = 0;           // !<
  49
  50         /**
  51          * @var Revision
  52          */
  53         var $mRevision = null;
  54
  55         /**
  56          * @var ParserOutput
  57          */
  58         var $mParserOutput;
  59
  60         /**@}}*/
  61
  62         /**
  63          * Constructor and clear the article
  64          * @param $title Title Reference to a Title object.
  65          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  66          */
  67         public function __construct( Title $title, $oldId = null ) {
  68                 $this->mOldId = $oldId;
  69                 $this->mPage = $this->newPage( $title );
  70         }
  71
  72         protected function newPage( Title $title ) {
  73                 return new WikiPage( $title );
  74         }
  75
  76         /**
  77          * Constructor from a page id
  78          * @param $id Int article ID to load
  79          */
  80         public static function newFromID( $id ) {
  81                 $t = Title::newFromID( $id );
  82                 # @todo FIXME: Doesn't inherit right
  83                 return $t == null ? null : new self( $t );
  84                 # return $t == null ? null : new static( $t ); // PHP 5.3
  85         }
  86
  87         /**
  88          * Create an Article object of the appropriate class for the given page.
  89          *
  90          * @param $title Title
  91          * @param $context RequestContext
  92          * @return Article object
  93          */
  94         public static function newFromTitle( $title, RequestContext $context ) {
  95                 if ( NS_MEDIA == $title->getNamespace() ) {
  96                         // FIXME: where should this go?
  97                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
  98                 }
  99
 100                 $page = null;
 101                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 102                 if ( !$page ) {
 103                         switch( $title->getNamespace() ) {
 104                                 case NS_FILE:
 105                                         $page = new ImagePage( $title );
 106                                         break;
 107                                 case NS_CATEGORY:
 108                                         $page = new CategoryPage( $title );
 109                                         break;
 110                                 default:
 111                                         $page = new Article( $title );
 112                         }
 113                 }
 114                 $page->setContext( $context );
 115
 116                 return $page;
 117         }
 118
 119         /**
 120          * Tell the page view functions that this view was redirected
 121          * from another page on the wiki.
 122          * @param $from Title object.
 123          */
 124         public function setRedirectedFrom( Title $from ) {
 125                 $this->mRedirectedFrom = $from;
 126         }
 127
 128         /**
 129          * Get the Title object this text redirects to
 130          *
 131          * @param $text string article content containing redirect info
 132          * @return mixed false, Title of in-wiki target, or string with URL
 133          * @deprecated since 1.17
 134          */
 135         public function followRedirectText( $text ) {
 136                 // recurse through to only get the final target
 137                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 138         }
 139
 140         /**
 141          * Get the title object of the article
 142          * @return Title object of this page
 143          */
 144         public function getTitle() {
 145                 return $this->mPage->getTitle();
 146         }
 147
 148         /**
 149          * Clear the object
 150          * @todo FIXME: Shouldn't this be public?
 151          * @private
 152          */
 153         public function clear() {
 154                 $this->mContentLoaded = false;
 155
 156                 $this->mRedirectedFrom = null; # Title object if set
 157                 $this->mRevIdFetched = 0;
 158                 $this->mRedirectUrl = false;
 159
 160                 $this->mPage->clear();
 161         }
 162
 163         /**
 164          * Note that getContent/loadContent do not follow redirects anymore.
 165          * If you need to fetch redirectable content easily, try
 166          * the shortcut in Article::followRedirect()
 167          *
 168          * This function has side effects! Do not use this function if you
 169          * only want the real revision text if any.
 170          *
 171          * @return Return the text of this revision
 172          */
 173         public function getContent() {
 174                 global $wgUser;
 175
 176                 wfProfileIn( __METHOD__ );
 177
 178                 if ( $this->mPage->getID() === 0 ) {
 179                         # If this is a MediaWiki:x message, then load the messages
 180                         # and return the message value for x.
 181                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 182                                 $text = $this->getTitle()->getDefaultMessageText();
 183                                 if ( $text === false ) {
 184                                         $text = '';
 185                                 }
 186                         } else {
 187                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 188                         }
 189                         wfProfileOut( __METHOD__ );
 190
 191                         return $text;
 192                 } else {
 193                         $this->loadContent();
 194                         wfProfileOut( __METHOD__ );
 195
 196                         return $this->mContent;
 197                 }
 198         }
 199
 200         /**
 201          * @return int The oldid of the article that is to be shown, 0 for the
 202          *             current revision
 203          */
 204         public function getOldID() {
 205                 if ( is_null( $this->mOldId ) ) {
 206                         $this->mOldId = $this->getOldIDFromRequest();
 207                 }
 208
 209                 return $this->mOldId;
 210         }
 211
 212         /**
 213          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 214          *
 215          * @return int The old id for the request
 216          */
 217         public function getOldIDFromRequest() {
 218                 global $wgRequest;
 219
 220                 $this->mRedirectUrl = false;
 221
 222                 $oldid = $wgRequest->getVal( 'oldid' );
 223
 224                 if ( isset( $oldid ) ) {
 225                         $oldid = intval( $oldid );
 226                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 227                                 $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 228                                 if ( $nextid ) {
 229                                         $oldid = $nextid;
 230                                 } else {
 231                                         $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 232                                 }
 233                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 234                                 $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 235                                 if ( $previd ) {
 236                                         $oldid = $previd;
 237                                 }
 238                         }
 239                 }
 240
 241                 if ( !$oldid ) {
 242                         $oldid = 0;
 243                 }
 244
 245                 return $oldid;
 246         }
 247
 248         /**
 249          * Load the revision (including text) into this object
 250          */
 251         function loadContent() {
 252                 if ( $this->mContentLoaded ) {
 253                         return;
 254                 }
 255
 256                 wfProfileIn( __METHOD__ );
 257
 258                 $this->fetchContent( $this->getOldID() );
 259
 260                 wfProfileOut( __METHOD__ );
 261         }
 262
 263         /**
 264          * Get text of an article from database
 265          * Does *NOT* follow redirects.
 266          *
 267          * @param $oldid Int: 0 for whatever the latest revision is
 268          * @return mixed string containing article contents, or false if null
 269          */
 270         function fetchContent( $oldid = 0 ) {
 271                 if ( $this->mContentLoaded ) {
 272                         return $this->mContent;
 273                 }
 274
 275                 # Pre-fill content with error message so that if something
 276                 # fails we'll have something telling us what we intended.
 277                 $t = $this->getTitle()->getPrefixedText();
 278                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 279                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 280
 281                 if ( $oldid ) {
 282                         $revision = Revision::newFromId( $oldid );
 283                         if ( !$revision ) {
 284                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 285                                 return false;
 286                         }
 287                         // Revision title doesn't match the page title given?
 288                         if ( $this->mPage->getID() != $revision->getPage() ) {
 289                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 290                                 $this->mPage = call_user_func( $function, $revision->getPage() );
 291                                 if ( !$this->mPage->getId() ) {
 292                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 293                                         return false;
 294                                 }
 295                         }
 296                 } else {
 297                         if ( $this->mPage->getLatest() === false ) {
 298                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 299                                 return false;
 300                         }
 301
 302                         $revision = $this->mPage->getRevision();
 303                         if ( !$revision ) {
 304                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 305                                 return false;
 306                         }
 307                 }
 308
 309                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 310                 // We should instead work with the Revision object when we need it...
 311                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 312
 313                 $this->mRevIdFetched = $revision->getId();
 314                 $this->mContentLoaded = true;
 315                 $this->mRevision =& $revision;
 316
 317                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 318
 319                 return $this->mContent;
 320         }
 321
 322         /**
 323          * No-op
 324          * @deprecated since 1.18
 325          */
 326         public function forUpdate() {
 327                 wfDeprecated( __METHOD__ );
 328         }
 329
 330         /**
 331          * Returns true if the currently-referenced revision is the current edit
 332          * to this page (and it exists).
 333          * @return bool
 334          */
 335         public function isCurrent() {
 336                 # If no oldid, this is the current version.
 337                 if ( $this->getOldID() == 0 ) {
 338                         return true;
 339                 }
 340
 341                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 342         }
 343
 344         /**
 345          * Use this to fetch the rev ID used on page views
 346          *
 347          * @return int revision ID of last article revision
 348          */
 349         public function getRevIdFetched() {
 350                 if ( $this->mRevIdFetched ) {
 351                         return $this->mRevIdFetched;
 352                 } else {
 353                         return $this->mPage->getLatest();
 354                 }
 355         }
 356
 357         /**
 358          * This is the default action of the index.php entry point: just view the
 359          * page of the given title.
 360          */
 361         public function view() {
 362                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 363                 global $wgUseFileCache, $wgUseETag;
 364
 365                 wfProfileIn( __METHOD__ );
 366
 367                 # Get variables from query string
 368                 $oldid = $this->getOldID();
 369
 370                 # getOldID may want us to redirect somewhere else
 371                 if ( $this->mRedirectUrl ) {
 372                         $wgOut->redirect( $this->mRedirectUrl );
 373                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 374                         wfProfileOut( __METHOD__ );
 375
 376                         return;
 377                 }
 378
 379                 $wgOut->setArticleFlag( true );
 380                 # Set page title (may be overridden by DISPLAYTITLE)
 381                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 382
 383                 # If we got diff in the query, we want to see a diff page instead of the article.
 384                 if ( $wgRequest->getCheck( 'diff' ) ) {
 385                         wfDebug( __METHOD__ . ": showing diff page\n" );
 386                         $this->showDiffPage();
 387                         wfProfileOut( __METHOD__ );
 388
 389                         return;
 390                 }
 391
 392                 # Allow frames by default
 393                 $wgOut->allowClickjacking();
 394
 395                 $parserCache = ParserCache::singleton();
 396
 397                 $parserOptions = $this->mPage->getParserOptions();
 398                 # Render printable version, use printable version cache
 399                 if ( $wgOut->isPrintable() ) {
 400                         $parserOptions->setIsPrintable( true );
 401                         $parserOptions->setEditSection( false );
 402                 } elseif ( $wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 403                         $parserOptions->setEditSection( false );
 404                 }
 405
 406                 # Try client and file cache
 407                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 408                         if ( $wgUseETag ) {
 409                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 410                         }
 411
 412                         # Is it client cached?
 413                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 414                                 wfDebug( __METHOD__ . ": done 304\n" );
 415                                 wfProfileOut( __METHOD__ );
 416
 417                                 return;
 418                         # Try file cache
 419                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 420                                 wfDebug( __METHOD__ . ": done file cache\n" );
 421                                 # tell wgOut that output is taken care of
 422                                 $wgOut->disable();
 423                                 $this->mPage->viewUpdates();
 424                                 wfProfileOut( __METHOD__ );
 425
 426                                 return;
 427                         }
 428                 }
 429
 430                 if ( !$wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 431                         $parserOptions->setEditSection( false );
 432                 }
 433
 434                 # Should the parser cache be used?
 435                 $useParserCache = $this->useParserCache( $oldid );
 436                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 437                 if ( $wgUser->getStubThreshold() ) {
 438                         wfIncrStats( 'pcache_miss_stub' );
 439                 }
 440
 441                 $wasRedirected = $this->showRedirectedFromHeader();
 442                 $this->showNamespaceHeader();
 443
 444                 # Iterate through the possible ways of constructing the output text.
 445                 # Keep going until $outputDone is set, or we run out of things to do.
 446                 $pass = 0;
 447                 $outputDone = false;
 448                 $this->mParserOutput = false;
 449
 450                 while ( !$outputDone && ++$pass ) {
 451                         switch( $pass ) {
 452                                 case 1:
 453                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 454                                         break;
 455                                 case 2:
 456                                         # Try the parser cache
 457                                         if ( $useParserCache ) {
 458                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 459
 460                                                 if ( $this->mParserOutput !== false ) {
 461                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 462                                                         $wgOut->addParserOutput( $this->mParserOutput );
 463                                                         # Ensure that UI elements requiring revision ID have
 464                                                         # the correct version information.
 465                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 466                                                         $outputDone = true;
 467                                                         # Preload timestamp to avoid a DB hit
 468                                                         if ( isset( $this->mParserOutput->mTimestamp ) ) {
 469                                                                 $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
 470                                                         }
 471                                                 }
 472                                         }
 473                                         break;
 474                                 case 3:
 475                                         $text = $this->getContent();
 476                                         if ( $text === false || $this->mPage->getID() == 0 ) {
 477                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 478                                                 $this->showMissingArticle();
 479                                                 wfProfileOut( __METHOD__ );
 480                                                 return;
 481                                         }
 482
 483                                         # Another whitelist check in case oldid is altering the title
 484                                         if ( !$this->getTitle()->userCanRead() ) {
 485                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 486                                                 $wgOut->loginToUse();
 487                                                 $wgOut->output();
 488                                                 $wgOut->disable();
 489                                                 wfProfileOut( __METHOD__ );
 490                                                 return;
 491                                         }
 492
 493                                         # Are we looking at an old revision
 494                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 495                                                 $this->setOldSubtitle( $oldid );
 496
 497                                                 if ( !$this->showDeletedRevisionHeader() ) {
 498                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 499                                                         wfProfileOut( __METHOD__ );
 500                                                         return;
 501                                                 }
 502
 503                                                 # If this "old" version is the current, then try the parser cache...
 504                                                 if ( $oldid === $this->mPage->getLatest() && $this->useParserCache( false ) ) {
 505                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 506                                                         if ( $this->mParserOutput ) {
 507                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 508                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 509                                                                 $wgOut->setRevisionId( $this->mPage->getLatest() );
 510                                                                 $outputDone = true;
 511                                                                 break;
 512                                                         }
 513                                                 }
 514                                         }
 515
 516                                         # Ensure that UI elements requiring revision ID have
 517                                         # the correct version information.
 518                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 519
 520                                         # Pages containing custom CSS or JavaScript get special treatment
 521                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 522                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 523                                                 $this->showCssOrJsPage();
 524                                                 $outputDone = true;
 525                                         } else {
 526                                                 $rt = Title::newFromRedirectArray( $text );
 527                                                 if ( $rt ) {
 528                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 529                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 530                                                         # Don't append the subtitle if this was an old revision
 531                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 532                                                         # Parse just to get categories, displaytitle, etc.
 533                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 534                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 535                                                         $outputDone = true;
 536                                                 }
 537                                         }
 538                                         break;
 539                                 case 4:
 540                                         # Run the parse, protected by a pool counter
 541                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 542
 543                                         $key = $parserCache->getKey( $this, $parserOptions );
 544                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
 545
 546                                         if ( !$poolArticleView->execute() ) {
 547                                                 # Connection or timeout error
 548                                                 wfProfileOut( __METHOD__ );
 549                                                 return;
 550                                         } else {
 551                                                 $outputDone = true;
 552                                         }
 553                                         break;
 554                                 # Should be unreachable, but just in case...
 555                                 default:
 556                                         break 2;
 557                         }
 558                 }
 559
 560                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 561                 if ( $this->mParserOutput ) {
 562                         $titleText = $this->mParserOutput->getTitleText();
 563
 564                         if ( strval( $titleText ) !== '' ) {
 565                                 $wgOut->setPageTitle( $titleText );
 566                         }
 567                 }
 568
 569                 # For the main page, overwrite the <title> element with the con-
 570                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 571                 # that's not empty).
 572                 # This message always exists because it is in the i18n files
 573                 if ( $this->getTitle()->equals( Title::newMainPage() ) ) {
 574                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 575                         if ( !$msg->isDisabled() ) {
 576                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 577                         }
 578                 }
 579
 580                 # Now that we've filled $this->mParserOutput, we know whether
 581                 # there are any __NOINDEX__ tags on the page
 582                 $policy = $this->getRobotPolicy( 'view' );
 583                 $wgOut->setIndexPolicy( $policy['index'] );
 584                 $wgOut->setFollowPolicy( $policy['follow'] );
 585
 586                 $this->showViewFooter();
 587                 $this->mPage->viewUpdates();
 588                 wfProfileOut( __METHOD__ );
 589         }
 590
 591         /**
 592          * Show a diff page according to current request variables. For use within
 593          * Article::view() only, other callers should use the DifferenceEngine class.
 594          */
 595         public function showDiffPage() {
 596                 global $wgRequest, $wgUser;
 597
 598                 $diff = $wgRequest->getVal( 'diff' );
 599                 $rcid = $wgRequest->getVal( 'rcid' );
 600                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 601                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 602                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 603                 $oldid = $this->getOldID();
 604
 605                 $de = new DifferenceEngine( $this->getTitle(), $oldid, $diff, $rcid, $purge, $unhide );
 606                 // DifferenceEngine directly fetched the revision:
 607                 $this->mRevIdFetched = $de->mNewid;
 608                 $de->showDiffPage( $diffOnly );
 609
 610                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 611                         # Run view updates for current revision only
 612                         $this->mPage->viewUpdates();
 613                 }
 614         }
 615
 616         /**
 617          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 618          * Article::view() only.
 619          *
 620          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 621          * page views.
 622          */
 623         protected function showCssOrJsPage() {
 624                 global $wgOut;
 625
 626                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
 627
 628                 // Give hooks a chance to customise the output
 629                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 630                         // Wrap the whole lot in a <pre> and don't parse
 631                         $m = array();
 632                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 633                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 634                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 635                         $wgOut->addHTML( "\n</pre>\n" );
 636                 }
 637         }
 638
 639         /**
 640          * Get the robot policy to be used for the current view
 641          * @param $action String the action= GET parameter
 642          * @return Array the policy that should be set
 643          * TODO: actions other than 'view'
 644          */
 645         public function getRobotPolicy( $action ) {
 646                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 647                 global $wgDefaultRobotPolicy, $wgRequest;
 648
 649                 $ns = $this->getTitle()->getNamespace();
 650
 651                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 652                         # Don't index user and user talk pages for blocked users (bug 11443)
 653                         if ( !$this->getTitle()->isSubpage() ) {
 654                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 655                                         return array(
 656                                                 'index'  => 'noindex',
 657                                                 'follow' => 'nofollow'
 658                                         );
 659                                 }
 660                         }
 661                 }
 662
 663                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 664                         # Non-articles (special pages etc), and old revisions
 665                         return array(
 666                                 'index'  => 'noindex',
 667                                 'follow' => 'nofollow'
 668                         );
 669                 } elseif ( $wgOut->isPrintable() ) {
 670                         # Discourage indexing of printable versions, but encourage following
 671                         return array(
 672                                 'index'  => 'noindex',
 673                                 'follow' => 'follow'
 674                         );
 675                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 676                         # For ?curid=x urls, disallow indexing
 677                         return array(
 678                                 'index'  => 'noindex',
 679                                 'follow' => 'follow'
 680                         );
 681                 }
 682
 683                 # Otherwise, construct the policy based on the various config variables.
 684                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 685
 686                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 687                         # Honour customised robot policies for this namespace
 688                         $policy = array_merge(
 689                                 $policy,
 690                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 691                         );
 692                 }
 693                 if ( $this->getTitle()->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
 694                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 695                         # a final sanity check that we have really got the parser output.
 696                         $policy = array_merge(
 697                                 $policy,
 698                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
 699                         );
 700                 }
 701
 702                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 703                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 704                         $policy = array_merge(
 705                                 $policy,
 706                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 707                         );
 708                 }
 709
 710                 return $policy;
 711         }
 712
 713         /**
 714          * Converts a String robot policy into an associative array, to allow
 715          * merging of several policies using array_merge().
 716          * @param $policy Mixed, returns empty array on null/false/'', transparent
 717          *            to already-converted arrays, converts String.
 718          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 719          */
 720         public static function formatRobotPolicy( $policy ) {
 721                 if ( is_array( $policy ) ) {
 722                         return $policy;
 723                 } elseif ( !$policy ) {
 724                         return array();
 725                 }
 726
 727                 $policy = explode( ',', $policy );
 728                 $policy = array_map( 'trim', $policy );
 729
 730                 $arr = array();
 731                 foreach ( $policy as $var ) {
 732                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 733                                 $arr['index'] = $var;
 734                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 735                                 $arr['follow'] = $var;
 736                         }
 737                 }
 738
 739                 return $arr;
 740         }
 741
 742         /**
 743          * If this request is a redirect view, send "redirected from" subtitle to
 744          * $wgOut. Returns true if the header was needed, false if this is not a
 745          * redirect view. Handles both local and remote redirects.
 746          *
 747          * @return boolean
 748          */
 749         public function showRedirectedFromHeader() {
 750                 global $wgOut, $wgRequest, $wgRedirectSources;
 751
 752                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 753
 754                 if ( isset( $this->mRedirectedFrom ) ) {
 755                         // This is an internally redirected page view.
 756                         // We'll need a backlink to the source page for navigation.
 757                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 758                                 $redir = Linker::link(
 759                                         $this->mRedirectedFrom,
 760                                         null,
 761                                         array(),
 762                                         array( 'redirect' => 'no' ),
 763                                         array( 'known', 'noclasses' )
 764                                 );
 765
 766                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 767                                 $wgOut->setSubtitle( $s );
 768
 769                                 // Set the fragment if one was specified in the redirect
 770                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 771                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 772                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 773                                 }
 774
 775                                 // Add a <link rel="canonical"> tag
 776                                 $wgOut->addLink( array( 'rel' => 'canonical',
 777                                         'href' => $this->getTitle()->getLocalURL() )
 778                                 );
 779
 780                                 return true;
 781                         }
 782                 } elseif ( $rdfrom ) {
 783                         // This is an externally redirected view, from some other wiki.
 784                         // If it was reported from a trusted site, supply a backlink.
 785                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 786                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 787                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 788                                 $wgOut->setSubtitle( $s );
 789
 790                                 return true;
 791                         }
 792                 }
 793
 794                 return false;
 795         }
 796
 797         /**
 798          * Show a header specific to the namespace currently being viewed, like
 799          * [[MediaWiki:Talkpagetext]]. For Article::view().
 800          */
 801         public function showNamespaceHeader() {
 802                 global $wgOut;
 803
 804                 if ( $this->getTitle()->isTalkPage() ) {
 805                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 806                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 807                         }
 808                 }
 809         }
 810
 811         /**
 812          * Show the footer section of an ordinary page view
 813          */
 814         public function showViewFooter() {
 815                 global $wgOut, $wgUseTrackbacks;
 816
 817                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 818                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 819                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 820                 }
 821
 822                 # If we have been passed an &rcid= parameter, we want to give the user a
 823                 # chance to mark this new article as patrolled.
 824                 $this->showPatrolFooter();
 825
 826                 # Trackbacks
 827                 if ( $wgUseTrackbacks ) {
 828                         $this->addTrackbacks();
 829                 }
 830
 831                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 832
 833         }
 834
 835         /**
 836          * If patrol is possible, output a patrol UI box. This is called from the
 837          * footer section of ordinary page views. If patrol is not possible or not
 838          * desired, does nothing.
 839          */
 840         public function showPatrolFooter() {
 841                 global $wgOut, $wgRequest, $wgUser;
 842
 843                 $rcid = $wgRequest->getVal( 'rcid' );
 844
 845                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 846                         return;
 847                 }
 848
 849                 $token = $wgUser->editToken( $rcid );
 850                 $wgOut->preventClickjacking();
 851
 852                 $wgOut->addHTML(
 853                         "<div class='patrollink'>" .
 854                                 wfMsgHtml(
 855                                         'markaspatrolledlink',
 856                                         Linker::link(
 857                                                 $this->getTitle(),
 858                                                 wfMsgHtml( 'markaspatrolledtext' ),
 859                                                 array(),
 860                                                 array(
 861                                                         'action' => 'markpatrolled',
 862                                                         'rcid' => $rcid,
 863                                                         'token' => $token,
 864                                                 ),
 865                                                 array( 'known', 'noclasses' )
 866                                         )
 867                                 ) .
 868                         '</div>'
 869                 );
 870         }
 871
 872         /**
 873          * Show the error text for a missing article. For articles in the MediaWiki
 874          * namespace, show the default message text. To be called from Article::view().
 875          */
 876         public function showMissingArticle() {
 877                 global $wgOut, $wgRequest, $wgUser;
 878
 879                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 880                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 881                         $parts = explode( '/', $this->getTitle()->getText() );
 882                         $rootPart = $parts[0];
 883                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 884                         $ip = User::isIP( $rootPart );
 885
 886                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
 887                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 888                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 889                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 890                                 LogEventsList::showLogExtract(
 891                                         $wgOut,
 892                                         'block',
 893                                         $user->getUserPage()->getPrefixedText(),
 894                                         '',
 895                                         array(
 896                                                 'lim' => 1,
 897                                                 'showIfEmpty' => false,
 898                                                 'msgKey' => array(
 899                                                         'blocked-notice-logextract',
 900                                                         $user->getName() # Support GENDER in notice
 901                                                 )
 902                                         )
 903                                 );
 904                         }
 905                 }
 906
 907                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 908
 909                 # Show delete and move logs
 910                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 911                         array(  'lim' => 10,
 912                                 'conds' => array( "log_action != 'revision'" ),
 913                                 'showIfEmpty' => false,
 914                                 'msgKey' => array( 'moveddeleted-notice' ) )
 915                 );
 916
 917                 # Show error message
 918                 $oldid = $this->getOldID();
 919                 if ( $oldid ) {
 920                         $text = wfMsgNoTrans( 'missing-article',
 921                                 $this->getTitle()->getPrefixedText(),
 922                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 923                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 924                         // Use the default message text
 925                         $text = $this->getTitle()->getDefaultMessageText();
 926                 } else {
 927                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 928                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 929                         $errors = array_merge( $createErrors, $editErrors );
 930
 931                         if ( !count( $errors ) ) {
 932                                 $text = wfMsgNoTrans( 'noarticletext' );
 933                         } else {
 934                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 935                         }
 936                 }
 937                 $text = "<div class='noarticletext'>\n$text\n</div>";
 938
 939                 if ( !$this->mPage->hasViewableContent() ) {
 940                         // If there's no backing content, send a 404 Not Found
 941                         // for better machine handling of broken links.
 942                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
 943                 }
 944
 945                 $wgOut->addWikiText( $text );
 946         }
 947
 948         /**
 949          * If the revision requested for view is deleted, check permissions.
 950          * Send either an error message or a warning header to $wgOut.
 951          *
 952          * @return boolean true if the view is allowed, false if not.
 953          */
 954         public function showDeletedRevisionHeader() {
 955                 global $wgOut, $wgRequest;
 956
 957                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 958                         // Not deleted
 959                         return true;
 960                 }
 961
 962                 // If the user is not allowed to see it...
 963                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 964                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 965                                 'rev-deleted-text-permission' );
 966
 967                         return false;
 968                 // If the user needs to confirm that they want to see it...
 969                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
 970                         # Give explanation and add a link to view the revision...
 971                         $oldid = intval( $this->getOldID() );
 972                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
 973                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 974                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
 975                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 976                                 array( $msg, $link ) );
 977
 978                         return false;
 979                 // We are allowed to see...
 980                 } else {
 981                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 982                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
 983                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
 984
 985                         return true;
 986                 }
 987         }
 988
 989         /**
 990          * Execute the uncached parse for action=view
 991          */
 992         public function doViewParse() {
 993                 global $wgOut;
 994
 995                 $oldid = $this->getOldID();
 996                 $parserOptions = $this->mPage->getParserOptions();
 997
 998                 # Render printable version, use printable version cache
 999                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1000
1001                 # Don't show section-edit links on old revisions... this way lies madness.
1002                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
1003                         $parserOptions->setEditSection( false );
1004                 }
1005
1006                 $useParserCache = $this->useParserCache( $oldid );
1007                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1008
1009                 return true;
1010         }
1011
1012         /**
1013          * Try to fetch an expired entry from the parser cache. If it is present,
1014          * output it and return true. If it is not present, output nothing and
1015          * return false. This is used as a callback function for
1016          * PoolCounter::executeProtected().
1017          *
1018          * @return boolean
1019          */
1020         public function tryDirtyCache() {
1021                 global $wgOut;
1022                 $parserCache = ParserCache::singleton();
1023                 $options = $this->mPage->getParserOptions();
1024
1025                 if ( $wgOut->isPrintable() ) {
1026                         $options->setIsPrintable( true );
1027                         $options->setEditSection( false );
1028                 }
1029
1030                 $output = $parserCache->getDirty( $this, $options );
1031
1032                 if ( $output ) {
1033                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1034                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1035                         $wgOut->setSquidMaxage( 0 );
1036                         $this->mParserOutput = $output;
1037                         $wgOut->addParserOutput( $output );
1038                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1039
1040                         return true;
1041                 } else {
1042                         wfDebugLog( 'dirty', "dirty missing\n" );
1043                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1044
1045                         return false;
1046                 }
1047         }
1048
1049         /**
1050          * View redirect
1051          *
1052          * @param $target Title|Array of destination(s) to redirect
1053          * @param $appendSubtitle Boolean [optional]
1054          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1055          * @return string containing HMTL with redirect link
1056          */
1057         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1058                 global $wgOut, $wgStylePath;
1059
1060                 if ( !is_array( $target ) ) {
1061                         $target = array( $target );
1062                 }
1063
1064                 $imageDir = wfUILang()->getDir();
1065
1066                 if ( $appendSubtitle ) {
1067                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1068                 }
1069
1070                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1071                 $title = array_shift( $target );
1072
1073                 if ( $forceKnown ) {
1074                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1075                 } else {
1076                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1077                 }
1078
1079                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1080                 $alt = wfUILang()->isRTL() ? '←' : '→';
1081                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1082                 foreach ( $target as $rt ) {
1083                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1084                         if ( $forceKnown ) {
1085                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1086                         } else {
1087                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1088                         }
1089                 }
1090
1091                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1092                 return '<div class="redirectMsg">' .
1093                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1094                         '<span class="redirectText">' . $link . '</span></div>';
1095         }
1096
1097         /**
1098          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1099          */
1100         public function addTrackbacks() {
1101                 global $wgOut;
1102
1103                 $dbr = wfGetDB( DB_SLAVE );
1104                 $tbs = $dbr->select( 'trackbacks',
1105                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1106                         array( 'tb_page' => $this->mPage->getID() )
1107                 );
1108
1109                 if ( !$dbr->numRows( $tbs ) ) {
1110                         return;
1111                 }
1112
1113                 $wgOut->preventClickjacking();
1114
1115                 $tbtext = "";
1116                 foreach ( $tbs as $o ) {
1117                         $rmvtxt = "";
1118
1119                         if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
1120                                 $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
1121                                         $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->editToken() ) );
1122                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1123                         }
1124
1125                         $tbtext .= "\n";
1126                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1127                                         $o->tb_title,
1128                                         $o->tb_url,
1129                                         $o->tb_ex,
1130                                         $o->tb_name,
1131                                         $rmvtxt );
1132                 }
1133
1134                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1135         }
1136
1137         /**
1138          * Removes trackback record for current article from trackbacks table
1139          * @deprecated since 1.19
1140          */
1141         public function deletetrackback() {
1142                 return Action::factory( 'deletetrackback', $this )->show();
1143         }
1144
1145         /**
1146          * Handle action=render
1147          */
1148
1149         public function render() {
1150                 global $wgOut;
1151
1152                 $wgOut->setArticleBodyOnly( true );
1153                 $this->view();
1154         }
1155
1156         /**
1157          * Handle action=purge
1158          */
1159         public function purge() {
1160                 return Action::factory( 'purge', $this )->show();
1161         }
1162
1163         /**
1164          * Mark this particular edit/page as patrolled
1165          * @deprecated since 1.19
1166          */
1167         public function markpatrolled() {
1168                 Action::factory( 'markpatrolled', $this )->show();
1169         }
1170
1171         /**
1172          * User-interface handler for the "watch" action.
1173          * Requires Request to pass a token as of 1.19.
1174          * @deprecated since 1.18
1175          */
1176         public function watch() {
1177                 Action::factory( 'watch', $this )->show();
1178         }
1179
1180         /**
1181          * Add this page to $wgUser's watchlist
1182          *
1183          * This is safe to be called multiple times
1184          *
1185          * @return bool true on successful watch operation
1186          * @deprecated since 1.18
1187          */
1188         public function doWatch() {
1189                 global $wgUser;
1190                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1191         }
1192
1193         /**
1194          * User interface handler for the "unwatch" action.
1195          * Requires Request to pass a token as of 1.19.
1196          * @deprecated since 1.18
1197          */
1198         public function unwatch() {
1199                 Action::factory( 'unwatch', $this )->show();
1200         }
1201
1202         /**
1203          * Stop watching a page
1204          * @return bool true on successful unwatch
1205          * @deprecated since 1.18
1206          */
1207         public function doUnwatch() {
1208                 global $wgUser;
1209                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1210         }
1211
1212         /**
1213          * action=protect handler
1214          */
1215         public function protect() {
1216                 $form = new ProtectionForm( $this );
1217                 $form->execute();
1218         }
1219
1220         /**
1221          * action=unprotect handler (alias)
1222          */
1223         public function unprotect() {
1224                 $this->protect();
1225         }
1226
1227         /**
1228          * Info about this page
1229          * Called for ?action=info when $wgAllowPageInfo is on.
1230          */
1231         public function info() {
1232                 Action::factory( 'info', $this )->show();
1233         }
1234
1235         /**
1236          * Overriden by ImagePage class, only present here to avoid a fatal error
1237          * Called for ?action=revert
1238          */
1239         public function revert() {
1240                 Action::factory( 'revert', $this )->show();
1241         }
1242
1243         /**
1244          * Output a redirect back to the article.
1245          * This is typically used after an edit.
1246          *
1247          * @deprecated in 1.19; call $wgOut->redirect() directly
1248          * @param $noRedir Boolean: add redirect=no
1249          * @param $sectionAnchor String: section to redirect to, including "#"
1250          * @param $extraQuery String: extra query params
1251          */
1252         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1253                 wfDeprecated( __METHOD__ );
1254                 global $wgOut;
1255
1256                 if ( $noRedir ) {
1257                         $query = 'redirect=no';
1258                         if ( $extraQuery )
1259                                 $query .= "&$extraQuery";
1260                 } else {
1261                         $query = $extraQuery;
1262                 }
1263
1264                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1265         }
1266
1267         /**
1268          * Auto-generates a deletion reason
1269          *
1270          * @param &$hasHistory Boolean: whether the page has a history
1271          * @return mixed String containing deletion reason or empty string, or boolean false
1272          *    if no revision occurred
1273          */
1274         public function generateReason( &$hasHistory ) {
1275                 global $wgContLang;
1276
1277                 $dbw = wfGetDB( DB_MASTER );
1278                 // Get the last revision
1279                 $rev = Revision::newFromTitle( $this->getTitle() );
1280
1281                 if ( is_null( $rev ) ) {
1282                         return false;
1283                 }
1284
1285                 // Get the article's contents
1286                 $contents = $rev->getText();
1287                 $blank = false;
1288
1289                 // If the page is blank, use the text from the previous revision,
1290                 // which can only be blank if there's a move/import/protect dummy revision involved
1291                 if ( $contents == '' ) {
1292                         $prev = $rev->getPrevious();
1293
1294                         if ( $prev )    {
1295                                 $contents = $prev->getText();
1296                                 $blank = true;
1297                         }
1298                 }
1299
1300                 // Find out if there was only one contributor
1301                 // Only scan the last 20 revisions
1302                 $res = $dbw->select( 'revision', 'rev_user_text',
1303                         array( 'rev_page' => $this->mPage->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
1304                         __METHOD__,
1305                         array( 'LIMIT' => 20 )
1306                 );
1307
1308                 if ( $res === false ) {
1309                         // This page has no revisions, which is very weird
1310                         return false;
1311                 }
1312
1313                 $hasHistory = ( $res->numRows() > 1 );
1314                 $row = $dbw->fetchObject( $res );
1315
1316                 if ( $row ) { // $row is false if the only contributor is hidden
1317                         $onlyAuthor = $row->rev_user_text;
1318                         // Try to find a second contributor
1319                         foreach ( $res as $row ) {
1320                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
1321                                         $onlyAuthor = false;
1322                                         break;
1323                                 }
1324                         }
1325                 } else {
1326                         $onlyAuthor = false;
1327                 }
1328
1329                 // Generate the summary with a '$1' placeholder
1330                 if ( $blank ) {
1331                         // The current revision is blank and the one before is also
1332                         // blank. It's just not our lucky day
1333                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
1334                 } else {
1335                         if ( $onlyAuthor ) {
1336                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
1337                         } else {
1338                                 $reason = wfMsgForContent( 'excontent', '$1' );
1339                         }
1340                 }
1341
1342                 if ( $reason == '-' ) {
1343                         // Allow these UI messages to be blanked out cleanly
1344                         return '';
1345                 }
1346
1347                 // Replace newlines with spaces to prevent uglyness
1348                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
1349                 // Calculate the maximum amount of chars to get
1350                 // Max content length = max comment length - length of the comment (excl. $1)
1351                 $maxLength = 255 - ( strlen( $reason ) - 2 );
1352                 $contents = $wgContLang->truncate( $contents, $maxLength );
1353                 // Remove possible unfinished links
1354                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
1355                 // Now replace the '$1' placeholder
1356                 $reason = str_replace( '$1', $contents, $reason );
1357
1358                 return $reason;
1359         }
1360
1361
1362         /**
1363          * UI entry point for page deletion
1364          */
1365         public function delete() {
1366                 global $wgOut, $wgRequest;
1367
1368                 $confirm = $wgRequest->wasPosted() &&
1369                                 $this->getContext()->getUser()->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1370
1371                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1372                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
1373
1374                 $reason = $this->DeleteReasonList;
1375
1376                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
1377                         // Entry from drop down menu + additional comment
1378                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
1379                 } elseif ( $reason == 'other' ) {
1380                         $reason = $this->DeleteReason;
1381                 }
1382
1383                 # Flag to hide all contents of the archived revisions
1384                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $this->getContext()->getUser()->isAllowed( 'suppressrevision' );
1385
1386                 # This code desperately needs to be totally rewritten
1387
1388                 # Read-only check...
1389                 if ( wfReadOnly() ) {
1390                         $wgOut->readOnlyPage();
1391
1392                         return;
1393                 }
1394
1395                 # Check permissions
1396                 $permission_errors = $this->getTitle()->getUserPermissionsErrors( 'delete', $this->getContext()->getUser() );
1397
1398                 if ( count( $permission_errors ) > 0 ) {
1399                         $wgOut->showPermissionsErrorPage( $permission_errors );
1400
1401                         return;
1402                 }
1403
1404                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1405
1406                 # Better double-check that it hasn't been deleted yet!
1407                 $dbw = wfGetDB( DB_MASTER );
1408                 $conds = $this->getTitle()->pageCond();
1409                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1410                 if ( $latest === false ) {
1411                         $wgOut->showFatalError(
1412                                 Html::rawElement(
1413                                         'div',
1414                                         array( 'class' => 'error mw-error-cannotdelete' ),
1415                                         wfMsgExt( 'cannotdelete', array( 'parse' ),
1416                                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1417                                 )
1418                         );
1419                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1420                         LogEventsList::showLogExtract(
1421                                 $wgOut,
1422                                 'delete',
1423                                 $this->getTitle()->getPrefixedText()
1424                         );
1425
1426                         return;
1427                 }
1428
1429                 # Hack for big sites
1430                 $bigHistory = $this->mPage->isBigDeletion();
1431                 if ( $bigHistory && !$this->getTitle()->userCan( 'bigdelete' ) ) {
1432                         global $wgLang, $wgDeleteRevisionsLimit;
1433
1434                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1435                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1436
1437                         return;
1438                 }
1439
1440                 if ( $confirm ) {
1441                         $this->doDelete( $reason, $suppress );
1442
1443                         if ( $wgRequest->getCheck( 'wpWatch' ) && $this->getContext()->getUser()->isLoggedIn() ) {
1444                                 $this->doWatch();
1445                         } elseif ( $this->getTitle()->userIsWatching() ) {
1446                                 $this->doUnwatch();
1447                         }
1448
1449                         return;
1450                 }
1451
1452                 // Generate deletion reason
1453                 $hasHistory = false;
1454                 if ( !$reason ) {
1455                         $reason = $this->generateReason( $hasHistory );
1456                 }
1457
1458                 // If the page has a history, insert a warning
1459                 if ( $hasHistory && !$confirm ) {
1460                         global $wgLang;
1461
1462                         $revisions = $this->mPage->estimateRevisionCount();
1463                         // @todo FIXME: i18n issue/patchwork message
1464                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1465                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1466                                 wfMsgHtml( 'word-separator' ) . Linker::link( $this->getTitle(),
1467                                         wfMsgHtml( 'history' ),
1468                                         array( 'rel' => 'archives' ),
1469                                         array( 'action' => 'history' ) ) .
1470                                 '</strong>'
1471                         );
1472
1473                         if ( $bigHistory ) {
1474                                 global $wgDeleteRevisionsLimit;
1475                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1476                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1477                         }
1478                 }
1479
1480                 return $this->confirmDelete( $reason );
1481         }
1482
1483         /**
1484          * Output deletion confirmation dialog
1485          * @todo FIXME: Move to another file?
1486          * @param $reason String: prefilled reason
1487          */
1488         public function confirmDelete( $reason ) {
1489                 global $wgOut;
1490
1491                 wfDebug( "Article::confirmDelete\n" );
1492
1493                 $deleteBackLink = Linker::linkKnown( $this->getTitle() );
1494                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
1495                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1496                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1497
1498                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1499
1500                 if ( $this->getContext()->getUser()->isAllowed( 'suppressrevision' ) ) {
1501                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1502                                         <td></td>
1503                                         <td class='mw-input'><strong>" .
1504                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1505                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1506                                         "</strong></td>
1507                                 </tr>";
1508                 } else {
1509                         $suppress = '';
1510                 }
1511                 $checkWatch = $this->getContext()->getUser()->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1512
1513                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1514                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1515                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1516                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1517                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1518                         "<tr id=\"wpDeleteReasonListRow\">
1519                                 <td class='mw-label'>" .
1520                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1521                                 "</td>
1522                                 <td class='mw-input'>" .
1523                                         Xml::listDropDown( 'wpDeleteReasonList',
1524                                                 wfMsgForContent( 'deletereason-dropdown' ),
1525                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1526                                 "</td>
1527                         </tr>
1528                         <tr id=\"wpDeleteReasonRow\">
1529                                 <td class='mw-label'>" .
1530                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1531                                 "</td>
1532                                 <td class='mw-input'>" .
1533                                 Html::input( 'wpReason', $reason, 'text', array(
1534                                         'size' => '60',
1535                                         'maxlength' => '255',
1536                                         'tabindex' => '2',
1537                                         'id' => 'wpReason',
1538                                         'autofocus'
1539                                 ) ) .
1540                                 "</td>
1541                         </tr>";
1542
1543                 # Disallow watching if user is not logged in
1544                 if ( $this->getContext()->getUser()->isLoggedIn() ) {
1545                         $form .= "
1546                         <tr>
1547                                 <td></td>
1548                                 <td class='mw-input'>" .
1549                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1550                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1551                                 "</td>
1552                         </tr>";
1553                 }
1554
1555                 $form .= "
1556                         $suppress
1557                         <tr>
1558                                 <td></td>
1559                                 <td class='mw-submit'>" .
1560                                         Xml::submitButton( wfMsg( 'deletepage' ),
1561                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1562                                 "</td>
1563                         </tr>" .
1564                         Xml::closeElement( 'table' ) .
1565                         Xml::closeElement( 'fieldset' ) .
1566                         Html::hidden( 'wpEditToken', $this->getContext()->getUser()->editToken() ) .
1567                         Xml::closeElement( 'form' );
1568
1569                         if ( $this->getContext()->getUser()->isAllowed( 'editinterface' ) ) {
1570                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1571                                 $link = Linker::link(
1572                                         $title,
1573                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1574                                         array(),
1575                                         array( 'action' => 'edit' )
1576                                 );
1577                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1578                         }
1579
1580                 $wgOut->addHTML( $form );
1581                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1582                 LogEventsList::showLogExtract( $wgOut, 'delete',
1583                         $this->getTitle()->getPrefixedText()
1584                 );
1585         }
1586
1587         /**
1588          * Perform a deletion and output success or failure messages
1589          */
1590         public function doDelete( $reason, $suppress = false ) {
1591                 global $wgOut;
1592
1593                 $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );
1594
1595                 $error = '';
1596                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, $error ) ) {
1597                         $deleted = $this->getTitle()->getPrefixedText();
1598
1599                         $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1600                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1601
1602                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1603
1604                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1605                         $wgOut->returnToMain( false );
1606                 } else {
1607                         if ( $error == '' ) {
1608                                 $wgOut->showFatalError(
1609                                         Html::rawElement(
1610                                                 'div',
1611                                                 array( 'class' => 'error mw-error-cannotdelete' ),
1612                                                 wfMsgExt( 'cannotdelete', array( 'parse' ),
1613                                                         wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1614                                         )
1615                                 );
1616
1617                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1618
1619                                 LogEventsList::showLogExtract(
1620                                         $wgOut,
1621                                         'delete',
1622                                         $this->getTitle()->getPrefixedText()
1623                                 );
1624                         } else {
1625                                 $wgOut->showFatalError( $error );
1626                         }
1627                 }
1628         }
1629
1630         /**
1631          * User interface for rollback operations
1632          */
1633         public function rollback() {
1634                 global $wgUser, $wgOut, $wgRequest;
1635
1636                 $details = null;
1637
1638                 $result = $this->mPage->doRollback(
1639                         $wgRequest->getVal( 'from' ),
1640                         $wgRequest->getText( 'summary' ),
1641                         $wgRequest->getVal( 'token' ),
1642                         $wgRequest->getBool( 'bot' ),
1643                         $details
1644                 );
1645
1646                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
1647                         $wgOut->rateLimited();
1648                         return;
1649                 }
1650
1651                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
1652                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
1653                         $errArray = $result[0];
1654                         $errMsg = array_shift( $errArray );
1655                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
1656
1657                         if ( isset( $details['current'] ) ) {
1658                                 $current = $details['current'];
1659
1660                                 if ( $current->getComment() != '' ) {
1661                                         $wgOut->addWikiMsgArray( 'editcomment', array(
1662                                                 Linker::formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
1663                                 }
1664                         }
1665
1666                         return;
1667                 }
1668
1669                 # Display permissions errors before read-only message -- there's no
1670                 # point in misleading the user into thinking the inability to rollback
1671                 # is only temporary.
1672                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
1673                         # array_diff is completely broken for arrays of arrays, sigh.
1674                         # Remove any 'readonlytext' error manually.
1675                         $out = array();
1676                         foreach ( $result as $error ) {
1677                                 if ( $error != array( 'readonlytext' ) ) {
1678                                         $out [] = $error;
1679                                 }
1680                         }
1681                         $wgOut->showPermissionsErrorPage( $out );
1682
1683                         return;
1684                 }
1685
1686                 if ( $result == array( array( 'readonlytext' ) ) ) {
1687                         $wgOut->readOnlyPage();
1688
1689                         return;
1690                 }
1691
1692                 $current = $details['current'];
1693                 $target = $details['target'];
1694                 $newId = $details['newid'];
1695                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
1696                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1697
1698                 if ( $current->getUserText() === '' ) {
1699                         $old = wfMsg( 'rev-deleted-user' );
1700                 } else {
1701                         $old = Linker::userLink( $current->getUser(), $current->getUserText() )
1702                                 . Linker::userToolLinks( $current->getUser(), $current->getUserText() );
1703                 }
1704
1705                 $new = Linker::userLink( $target->getUser(), $target->getUserText() )
1706                         . Linker::userToolLinks( $target->getUser(), $target->getUserText() );
1707                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
1708                 $wgOut->returnToMain( false, $this->getTitle() );
1709
1710                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
1711                         $de = new DifferenceEngine( $this->getTitle(), $current->getId(), $newId, false, true );
1712                         $de->showDiff( '', '' );
1713                 }
1714         }
1715
1716         /**
1717          * Generate the navigation links when browsing through an article revisions
1718          * It shows the information as:
1719          *   Revision as of \<date\>; view current revision
1720          *   \<- Previous version | Next Version -\>
1721          *
1722          * @param $oldid String: revision ID of this article revision
1723          */
1724         public function setOldSubtitle( $oldid = 0 ) {
1725                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1726
1727                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1728                         return;
1729                 }
1730
1731                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1732
1733                 # Cascade unhide param in links for easy deletion browsing
1734                 $extraParams = array();
1735                 if ( $wgRequest->getVal( 'unhide' ) ) {
1736                         $extraParams['unhide'] = 1;
1737                 }
1738
1739                 $revision = Revision::newFromId( $oldid );
1740                 $timestamp = $revision->getTimestamp();
1741
1742                 $current = ( $oldid == $this->mPage->getLatest() );
1743                 $td = $wgLang->timeanddate( $timestamp, true );
1744                 $tddate = $wgLang->date( $timestamp, true );
1745                 $tdtime = $wgLang->time( $timestamp, true );
1746
1747                 $lnk = $current
1748                         ? wfMsgHtml( 'currentrevisionlink' )
1749                         : Linker::link(
1750                                 $this->getTitle(),
1751                                 wfMsgHtml( 'currentrevisionlink' ),
1752                                 array(),
1753                                 $extraParams,
1754                                 array( 'known', 'noclasses' )
1755                         );
1756                 $curdiff = $current
1757                         ? wfMsgHtml( 'diff' )
1758                         : Linker::link(
1759                                 $this->getTitle(),
1760                                 wfMsgHtml( 'diff' ),
1761                                 array(),
1762                                 array(
1763                                         'diff' => 'cur',
1764                                         'oldid' => $oldid
1765                                 ) + $extraParams,
1766                                 array( 'known', 'noclasses' )
1767                         );
1768                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1769                 $prevlink = $prev
1770                         ? Linker::link(
1771                                 $this->getTitle(),
1772                                 wfMsgHtml( 'previousrevision' ),
1773                                 array(),
1774                                 array(
1775                                         'direction' => 'prev',
1776                                         'oldid' => $oldid
1777                                 ) + $extraParams,
1778                                 array( 'known', 'noclasses' )
1779                         )
1780                         : wfMsgHtml( 'previousrevision' );
1781                 $prevdiff = $prev
1782                         ? Linker::link(
1783                                 $this->getTitle(),
1784                                 wfMsgHtml( 'diff' ),
1785                                 array(),
1786                                 array(
1787                                         'diff' => 'prev',
1788                                         'oldid' => $oldid
1789                                 ) + $extraParams,
1790                                 array( 'known', 'noclasses' )
1791                         )
1792                         : wfMsgHtml( 'diff' );
1793                 $nextlink = $current
1794                         ? wfMsgHtml( 'nextrevision' )
1795                         : Linker::link(
1796                                 $this->getTitle(),
1797                                 wfMsgHtml( 'nextrevision' ),
1798                                 array(),
1799                                 array(
1800                                         'direction' => 'next',
1801                                         'oldid' => $oldid
1802                                 ) + $extraParams,
1803                                 array( 'known', 'noclasses' )
1804                         );
1805                 $nextdiff = $current
1806                         ? wfMsgHtml( 'diff' )
1807                         : Linker::link(
1808                                 $this->getTitle(),
1809                                 wfMsgHtml( 'diff' ),
1810                                 array(),
1811                                 array(
1812                                         'diff' => 'next',
1813                                         'oldid' => $oldid
1814                                 ) + $extraParams,
1815                                 array( 'known', 'noclasses' )
1816                         );
1817
1818                 $cdel = '';
1819
1820                 // User can delete revisions or view deleted revisions...
1821                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1822                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1823                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
1824                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
1825                         } else {
1826                                 $query = array(
1827                                         'type'   => 'revision',
1828                                         'target' => $this->getTitle()->getPrefixedDbkey(),
1829                                         'ids'    => $oldid
1830                                 );
1831                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1832                         }
1833                         $cdel .= ' ';
1834                 }
1835
1836                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1837                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1838
1839                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1840                         ? 'revision-info-current'
1841                         : 'revision-info';
1842
1843                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
1844                         wfMsgExt(
1845                                 $infomsg,
1846                                 array( 'parseinline', 'replaceafter' ),
1847                                 $td,
1848                                 $userlinks,
1849                                 $revision->getID(),
1850                                 $tddate,
1851                                 $tdtime,
1852                                 $revision->getUser()
1853                         ) .
1854                         "</div>\n" .
1855                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1856                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
1857
1858                 $wgOut->addHTML( $r );
1859         }
1860
1861         /* Caching functions */
1862
1863         /**
1864          * checkLastModified returns true if it has taken care of all
1865          * output to the client that is necessary for this request.
1866          * (that is, it has sent a cached version of the page)
1867          *
1868          * @return boolean true if cached version send, false otherwise
1869          */
1870         protected function tryFileCache() {
1871                 static $called = false;
1872
1873                 if ( $called ) {
1874                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1875                         return false;
1876                 }
1877
1878                 $called = true;
1879                 if ( $this->isFileCacheable() ) {
1880                         $cache = new HTMLFileCache( $this->getTitle() );
1881                         if ( $cache->isFileCacheGood( $this->mPage->getTouched() ) ) {
1882                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1883                                 $cache->loadFromFileCache();
1884                                 return true;
1885                         } else {
1886                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1887                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1888                         }
1889                 } else {
1890                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1891                 }
1892
1893                 return false;
1894         }
1895
1896         /**
1897          * Check if the page can be cached
1898          * @return bool
1899          */
1900         public function isFileCacheable() {
1901                 $cacheable = false;
1902
1903                 if ( HTMLFileCache::useFileCache() ) {
1904                         $cacheable = $this->mPage->getID() && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1905                         // Extension may have reason to disable file caching on some pages.
1906                         if ( $cacheable ) {
1907                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1908                         }
1909                 }
1910
1911                 return $cacheable;
1912         }
1913
1914         /**#@-*/
1915
1916         /**
1917          * Add the primary page-view wikitext to the output buffer
1918          * Saves the text into the parser cache if possible.
1919          * Updates templatelinks if it is out of date.
1920          *
1921          * @param $text String
1922          * @param $cache Boolean
1923          * @param $parserOptions mixed ParserOptions object, or boolean false
1924          */
1925         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
1926                 global $wgOut;
1927
1928                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
1929
1930                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
1931
1932                 $wgOut->addParserOutput( $this->mParserOutput );
1933         }
1934
1935         /**
1936          * Lightweight method to get the parser output for a page, checking the parser cache
1937          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1938          * consider, so it's not appropriate to use there.
1939          *
1940          * @since 1.16 (r52326) for LiquidThreads
1941          *
1942          * @param $oldid mixed integer Revision ID or null
1943          * @param $user User The relevant user
1944          * @return ParserOutput or false if the given revsion ID is not found
1945          */
1946         public function getParserOutput( $oldid = null, User $user = null ) {
1947                 global $wgEnableParserCache, $wgUser;
1948                 $user = is_null( $user ) ? $wgUser : $user;
1949
1950                 // Should the parser cache be used?
1951                 $useParserCache = $wgEnableParserCache &&
1952                         $user->getStubThreshold() == 0 &&
1953                         $this->mPage->exists() &&
1954                         $oldid === null;
1955
1956                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1957
1958                 if ( $user->getStubThreshold() ) {
1959                         wfIncrStats( 'pcache_miss_stub' );
1960                 }
1961
1962                 if ( $useParserCache ) {
1963                         $parserOutput = ParserCache::singleton()->get( $this, $this->mPage->getParserOptions() );
1964                         if ( $parserOutput !== false ) {
1965                                 return $parserOutput;
1966                         }
1967                 }
1968
1969                 // Cache miss; parse and output it.
1970                 if ( $oldid === null ) {
1971                         $text = $this->mPage->getRawText();
1972                 } else {
1973                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
1974                         if ( $rev === null ) {
1975                                 return false;
1976                         }
1977                         $text = $rev->getText();
1978                 }
1979
1980                 return $this->getOutputFromWikitext( $text, $useParserCache );
1981         }
1982
1983         /**
1984          * This does all the heavy lifting for outputWikitext, except it returns the parser
1985          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
1986          * say, embedding thread pages within a discussion system (LiquidThreads)
1987          *
1988          * @param $text string
1989          * @param $cache boolean
1990          * @param $parserOptions parsing options, defaults to false
1991          * @return string containing parsed output
1992          */
1993         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
1994                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
1995
1996                 if ( !$parserOptions ) {
1997                         $parserOptions = $this->mPage->getParserOptions();
1998                 }
1999
2000                 $time = - wfTime();
2001                 $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
2002                         $parserOptions, true, true, $this->getRevIdFetched() );
2003                 $time += wfTime();
2004
2005                 # Timing hack
2006                 if ( $time > 3 ) {
2007                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2008                                 $this->getTitle()->getPrefixedDBkey() ) );
2009                 }
2010
2011                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
2012                         $parserCache = ParserCache::singleton();
2013                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
2014                 }
2015
2016                 // Make sure file cache is not used on uncacheable content.
2017                 // Output that has magic words in it can still use the parser cache
2018                 // (if enabled), though it will generally expire sooner.
2019                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
2020                         $wgUseFileCache = false;
2021                 }
2022
2023                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
2024
2025                 return $this->mParserOutput;
2026         }
2027
2028         /**
2029          * Updates cascading protections
2030          *
2031          * @param $parserOutput ParserOutput object, or boolean false
2032          **/
2033         protected function doCascadeProtectionUpdates( $parserOutput ) {
2034                 if ( !$this->isCurrent() || wfReadOnly() || !$this->getTitle()->areRestrictionsCascading() ) {
2035                         return;
2036                 }
2037
2038                 // templatelinks table may have become out of sync,
2039                 // especially if using variable-based transclusions.
2040                 // For paranoia, check if things have changed and if
2041                 // so apply updates to the database. This will ensure
2042                 // that cascaded protections apply as soon as the changes
2043                 // are visible.
2044
2045                 # Get templates from templatelinks
2046                 $id = $this->getTitle()->getArticleID();
2047
2048                 $tlTemplates = array();
2049
2050                 $dbr = wfGetDB( DB_SLAVE );
2051                 $res = $dbr->select( array( 'templatelinks' ),
2052                         array( 'tl_namespace', 'tl_title' ),
2053                         array( 'tl_from' => $id ),
2054                         __METHOD__
2055                 );
2056
2057                 foreach ( $res as $row ) {
2058                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2059                 }
2060
2061                 # Get templates from parser output.
2062                 $poTemplates = array();
2063                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2064                         foreach ( $templates as $dbk => $id ) {
2065                                 $poTemplates["$ns:$dbk"] = true;
2066                         }
2067                 }
2068
2069                 # Get the diff
2070                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2071
2072                 if ( count( $templates_diff ) > 0 ) {
2073                         # Whee, link updates time.
2074                         $u = new LinksUpdate( $this->getTitle(), $parserOutput, false );
2075                         $u->doUpdate();
2076                 }
2077         }
2078
2079         /**
2080          * Sets the context this Article is executed in
2081          *
2082          * @param $context RequestContext
2083          * @since 1.18
2084          */
2085         public function setContext( $context ) {
2086                 $this->mContext = $context;
2087         }
2088
2089         /**
2090          * Gets the context this Article is executed in
2091          *
2092          * @return RequestContext
2093          * @since 1.18
2094          */
2095         public function getContext() {
2096                 if ( $this->mContext instanceof RequestContext ) {
2097                         return $this->mContext;
2098                 } else {
2099                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
2100                         return RequestContext::getMain();
2101                 }
2102         }
2103
2104         /**
2105          * Use PHP's magic __get handler to handle accessing of
2106          * raw WikiPage fields for backwards compatibility.
2107          *
2108          * @param $fname String Field name
2109          */
2110         public function __get( $fname ) {
2111                 if ( property_exists( $this->mPage, $fname ) ) {
2112                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
2113                         return $this->mPage->$fname;
2114                 }
2115         trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2116         }
2117
2118         /**
2119          * Use PHP's magic __set handler to handle setting of
2120          * raw WikiPage fields for backwards compatibility.
2121          *
2122          * @param $fname String Field name
2123          * @param $fvalue mixed New value
2124          * @param $args Array Arguments to the method
2125          */
2126         public function __set( $fname, $fvalue ) {
2127                 if ( property_exists( $this->mPage, $fname ) ) {
2128                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
2129                         $this->mPage->$fname = $fvalue;
2130                 // Note: extensions may want to toss on new fields
2131                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
2132                         $this->mPage->$fname = $fvalue;
2133                 } else {
2134                         trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2135                 }
2136         }
2137
2138         /**
2139          * Use PHP's magic __call handler to transform instance calls to
2140          * WikiPage functions for backwards compatibility.
2141          *
2142          * @param $fname String Name of called method
2143          * @param $args Array Arguments to the method
2144          */
2145         public function __call( $fname, $args ) {
2146                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2147                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2148                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2149                 }
2150         trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2151         }
2152
2153         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2154         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2155                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
2156         }
2157
2158         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2159                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2160         }
2161
2162         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2163                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails );
2164         }
2165
2166         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
2167                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails );
2168         }
2169
2170         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2171         public static function selectFields() {
2172                 return WikiPage::selectFields();
2173         }
2174
2175         public static function onArticleCreate( $title ) {
2176                 return WikiPage::onArticleCreate( $title );
2177         }
2178
2179         public static function onArticleDelete( $title ) {
2180                 return WikiPage::onArticleDelete( $title );
2181         }
2182
2183         public static function onArticleEdit( $title ) {
2184                 return WikiPage::onArticleEdit( $title );
2185         }
2186
2187         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2188                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2189         }
2190         // ******
2191 }
2192
2193 class PoolWorkArticleView extends PoolCounterWork {
2194
2195         /**
2196          * @var Article
2197          */
2198         private $mArticle;
2199
2200         function __construct( $article, $key, $useParserCache, $parserOptions ) {
2201                 parent::__construct( 'ArticleView', $key );
2202                 $this->mArticle = $article;
2203                 $this->cacheable = $useParserCache;
2204                 $this->parserOptions = $parserOptions;
2205         }
2206
2207         function doWork() {
2208                 return $this->mArticle->doViewParse();
2209         }
2210
2211         function getCachedWork() {
2212                 global $wgOut;
2213
2214                 $parserCache = ParserCache::singleton();
2215                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
2216
2217                 if ( $this->mArticle->mParserOutput !== false ) {
2218                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
2219                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
2220                         # Ensure that UI elements requiring revision ID have
2221                         # the correct version information.
2222                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
2223                         return true;
2224                 }
2225                 return false;
2226         }
2227
2228         function fallback() {
2229                 return $this->mArticle->tryDirtyCache();
2230         }
2231
2232         /**
2233          * @param  $status Status
2234          */
2235         function error( $status ) {
2236                 global $wgOut;
2237
2238                 $wgOut->clearHTML(); // for release() errors
2239                 $wgOut->enableClientCache( false );
2240                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2241
2242                 $errortext = $status->getWikiText( false, 'view-pool-error' );
2243                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
2244
2245                 return false;
2246         }
2247 }