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