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