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                 $wgOut->setArticleFlag( true );
 368                 # Set page title (may be overridden by DISPLAYTITLE)
 369                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 370
 371                 # If we got diff in the query, we want to see a diff page instead of the article.
 372                 if ( $wgRequest->getCheck( 'diff' ) ) {
 373                         wfDebug( __METHOD__ . ": showing diff page\n" );
 374                         # Manually setting action=diff. Bug 25800
 375                         $wgRequest->setVal( 'action', 'historysubmit' );
 376                         $this->showDiffPage();
 377                         wfProfileOut( __METHOD__ );
 378
 379                         return;
 380                 }
 381
 382                 # Allow frames by default
 383                 $wgOut->allowClickjacking();
 384
 385                 $parserCache = ParserCache::singleton();
 386
 387                 $parserOptions = $this->mPage->getParserOptions();
 388                 # Render printable version, use printable version cache
 389                 if ( $wgOut->isPrintable() ) {
 390                         $parserOptions->setIsPrintable( true );
 391                         $parserOptions->setEditSection( false );
 392                 } elseif ( $wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 393                         $parserOptions->setEditSection( false );
 394                 }
 395
 396                 # Try client and file cache
 397                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 398                         if ( $wgUseETag ) {
 399                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 400                         }
 401
 402                         # Is it client cached?
 403                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 404                                 wfDebug( __METHOD__ . ": done 304\n" );
 405                                 wfProfileOut( __METHOD__ );
 406
 407                                 return;
 408                         # Try file cache
 409                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 410                                 wfDebug( __METHOD__ . ": done file cache\n" );
 411                                 # tell wgOut that output is taken care of
 412                                 $wgOut->disable();
 413                                 $this->mPage->viewUpdates();
 414                                 wfProfileOut( __METHOD__ );
 415
 416                                 return;
 417                         }
 418                 }
 419
 420                 if ( !$wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 421                         $parserOptions->setEditSection( false );
 422                 }
 423
 424                 # Should the parser cache be used?
 425                 $useParserCache = $this->useParserCache( $oldid );
 426                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 427                 if ( $wgUser->getStubThreshold() ) {
 428                         wfIncrStats( 'pcache_miss_stub' );
 429                 }
 430
 431                 $wasRedirected = $this->showRedirectedFromHeader();
 432                 $this->showNamespaceHeader();
 433
 434                 # Iterate through the possible ways of constructing the output text.
 435                 # Keep going until $outputDone is set, or we run out of things to do.
 436                 $pass = 0;
 437                 $outputDone = false;
 438                 $this->mParserOutput = false;
 439
 440                 while ( !$outputDone && ++$pass ) {
 441                         switch( $pass ) {
 442                                 case 1:
 443                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 444                                         break;
 445                                 case 2:
 446                                         # Try the parser cache
 447                                         if ( $useParserCache ) {
 448                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 449
 450                                                 if ( $this->mParserOutput !== false ) {
 451                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 452                                                         $wgOut->addParserOutput( $this->mParserOutput );
 453                                                         # Ensure that UI elements requiring revision ID have
 454                                                         # the correct version information.
 455                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 456                                                         $outputDone = true;
 457                                                         # Preload timestamp to avoid a DB hit
 458                                                         if ( isset( $this->mParserOutput->mTimestamp ) ) {
 459                                                                 $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
 460                                                         }
 461                                                 }
 462                                         }
 463                                         break;
 464                                 case 3:
 465                                         $text = $this->getContent();
 466                                         if ( $text === false || $this->mPage->getID() == 0 ) {
 467                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 468                                                 $this->showMissingArticle();
 469                                                 wfProfileOut( __METHOD__ );
 470                                                 return;
 471                                         }
 472
 473                                         # Another whitelist check in case oldid is altering the title
 474                                         if ( !$this->getTitle()->userCanRead() ) {
 475                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 476                                                 $wgOut->loginToUse();
 477                                                 $wgOut->output();
 478                                                 $wgOut->disable();
 479                                                 wfProfileOut( __METHOD__ );
 480                                                 return;
 481                                         }
 482
 483                                         # Are we looking at an old revision
 484                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 485                                                 $this->setOldSubtitle( $oldid );
 486
 487                                                 if ( !$this->showDeletedRevisionHeader() ) {
 488                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 489                                                         wfProfileOut( __METHOD__ );
 490                                                         return;
 491                                                 }
 492
 493                                                 # If this "old" version is the current, then try the parser cache...
 494                                                 if ( $oldid === $this->mPage->getLatest() && $this->useParserCache( false ) ) {
 495                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 496                                                         if ( $this->mParserOutput ) {
 497                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 498                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 499                                                                 $wgOut->setRevisionId( $this->mPage->getLatest() );
 500                                                                 $outputDone = true;
 501                                                                 break;
 502                                                         }
 503                                                 }
 504                                         }
 505
 506                                         # Ensure that UI elements requiring revision ID have
 507                                         # the correct version information.
 508                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 509
 510                                         # Pages containing custom CSS or JavaScript get special treatment
 511                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 512                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 513                                                 $this->showCssOrJsPage();
 514                                                 $outputDone = true;
 515                                         } else {
 516                                                 $rt = Title::newFromRedirectArray( $text );
 517                                                 if ( $rt ) {
 518                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 519                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 520                                                         # Don't append the subtitle if this was an old revision
 521                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 522                                                         # Parse just to get categories, displaytitle, etc.
 523                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 524                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 525                                                         $outputDone = true;
 526                                                 }
 527                                         }
 528                                         break;
 529                                 case 4:
 530                                         # Run the parse, protected by a pool counter
 531                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 532
 533                                         $key = $parserCache->getKey( $this, $parserOptions );
 534                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
 535
 536                                         if ( !$poolArticleView->execute() ) {
 537                                                 # Connection or timeout error
 538                                                 wfProfileOut( __METHOD__ );
 539                                                 return;
 540                                         } else {
 541                                                 $outputDone = true;
 542                                         }
 543                                         break;
 544                                 # Should be unreachable, but just in case...
 545                                 default:
 546                                         break 2;
 547                         }
 548                 }
 549
 550                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 551                 if ( $this->mParserOutput ) {
 552                         $titleText = $this->mParserOutput->getTitleText();
 553
 554                         if ( strval( $titleText ) !== '' ) {
 555                                 $wgOut->setPageTitle( $titleText );
 556                         }
 557                 }
 558
 559                 # For the main page, overwrite the <title> element with the con-
 560                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 561                 # that's not empty).
 562                 # This message always exists because it is in the i18n files
 563                 if ( $this->getTitle()->equals( Title::newMainPage() ) ) {
 564                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 565                         if ( !$msg->isDisabled() ) {
 566                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 567                         }
 568                 }
 569
 570                 # Now that we've filled $this->mParserOutput, we know whether
 571                 # there are any __NOINDEX__ tags on the page
 572                 $policy = $this->getRobotPolicy( 'view' );
 573                 $wgOut->setIndexPolicy( $policy['index'] );
 574                 $wgOut->setFollowPolicy( $policy['follow'] );
 575
 576                 $this->showViewFooter();
 577                 $this->mPage->viewUpdates();
 578                 wfProfileOut( __METHOD__ );
 579         }
 580
 581         /**
 582          * Show a diff page according to current request variables. For use within
 583          * Article::view() only, other callers should use the DifferenceEngine class.
 584          */
 585         public function showDiffPage() {
 586                 global $wgRequest, $wgUser;
 587
 588                 $diff = $wgRequest->getVal( 'diff' );
 589                 $rcid = $wgRequest->getVal( 'rcid' );
 590                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 591                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 592                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 593                 $oldid = $this->getOldID();
 594
 595                 $de = new DifferenceEngine( $this->getTitle(), $oldid, $diff, $rcid, $purge, $unhide );
 596                 // DifferenceEngine directly fetched the revision:
 597                 $this->mRevIdFetched = $de->mNewid;
 598                 $de->showDiffPage( $diffOnly );
 599
 600                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 601                         # Run view updates for current revision only
 602                         $this->mPage->viewUpdates();
 603                 }
 604         }
 605
 606         /**
 607          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 608          * Article::view() only.
 609          *
 610          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 611          * page views.
 612          */
 613         protected function showCssOrJsPage() {
 614                 global $wgOut, $wgLang;
 615
 616                 $dir = $wgLang->getDir();
 617                 $lang = $wgLang->getCode();
 618
 619                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 620                         'clearyourcache' );
 621
 622                 // Give hooks a chance to customise the output
 623                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 624                         // Wrap the whole lot in a <pre> and don't parse
 625                         $m = array();
 626                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 627                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 628                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 629                         $wgOut->addHTML( "\n</pre>\n" );
 630                 }
 631         }
 632
 633         /**
 634          * Get the robot policy to be used for the current view
 635          * @param $action String the action= GET parameter
 636          * @return Array the policy that should be set
 637          * TODO: actions other than 'view'
 638          */
 639         public function getRobotPolicy( $action ) {
 640                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 641                 global $wgDefaultRobotPolicy, $wgRequest;
 642
 643                 $ns = $this->getTitle()->getNamespace();
 644
 645                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 646                         # Don't index user and user talk pages for blocked users (bug 11443)
 647                         if ( !$this->getTitle()->isSubpage() ) {
 648                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 649                                         return array(
 650                                                 'index'  => 'noindex',
 651                                                 'follow' => 'nofollow'
 652                                         );
 653                                 }
 654                         }
 655                 }
 656
 657                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 658                         # Non-articles (special pages etc), and old revisions
 659                         return array(
 660                                 'index'  => 'noindex',
 661                                 'follow' => 'nofollow'
 662                         );
 663                 } elseif ( $wgOut->isPrintable() ) {
 664                         # Discourage indexing of printable versions, but encourage following
 665                         return array(
 666                                 'index'  => 'noindex',
 667                                 'follow' => 'follow'
 668                         );
 669                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 670                         # For ?curid=x urls, disallow indexing
 671                         return array(
 672                                 'index'  => 'noindex',
 673                                 'follow' => 'follow'
 674                         );
 675                 }
 676
 677                 # Otherwise, construct the policy based on the various config variables.
 678                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 679
 680                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 681                         # Honour customised robot policies for this namespace
 682                         $policy = array_merge(
 683                                 $policy,
 684                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 685                         );
 686                 }
 687                 if ( $this->getTitle()->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
 688                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 689                         # a final sanity check that we have really got the parser output.
 690                         $policy = array_merge(
 691                                 $policy,
 692                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
 693                         );
 694                 }
 695
 696                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 697                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 698                         $policy = array_merge(
 699                                 $policy,
 700                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 701                         );
 702                 }
 703
 704                 return $policy;
 705         }
 706
 707         /**
 708          * Converts a String robot policy into an associative array, to allow
 709          * merging of several policies using array_merge().
 710          * @param $policy Mixed, returns empty array on null/false/'', transparent
 711          *            to already-converted arrays, converts String.
 712          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 713          */
 714         public static function formatRobotPolicy( $policy ) {
 715                 if ( is_array( $policy ) ) {
 716                         return $policy;
 717                 } elseif ( !$policy ) {
 718                         return array();
 719                 }
 720
 721                 $policy = explode( ',', $policy );
 722                 $policy = array_map( 'trim', $policy );
 723
 724                 $arr = array();
 725                 foreach ( $policy as $var ) {
 726                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 727                                 $arr['index'] = $var;
 728                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 729                                 $arr['follow'] = $var;
 730                         }
 731                 }
 732
 733                 return $arr;
 734         }
 735
 736         /**
 737          * If this request is a redirect view, send "redirected from" subtitle to
 738          * $wgOut. Returns true if the header was needed, false if this is not a
 739          * redirect view. Handles both local and remote redirects.
 740          *
 741          * @return boolean
 742          */
 743         public function showRedirectedFromHeader() {
 744                 global $wgOut, $wgRequest, $wgRedirectSources;
 745
 746                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 747
 748                 if ( isset( $this->mRedirectedFrom ) ) {
 749                         // This is an internally redirected page view.
 750                         // We'll need a backlink to the source page for navigation.
 751                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 752                                 $redir = Linker::link(
 753                                         $this->mRedirectedFrom,
 754                                         null,
 755                                         array(),
 756                                         array( 'redirect' => 'no' ),
 757                                         array( 'known', 'noclasses' )
 758                                 );
 759
 760                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 761                                 $wgOut->setSubtitle( $s );
 762
 763                                 // Set the fragment if one was specified in the redirect
 764                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 765                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 766                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 767                                 }
 768
 769                                 // Add a <link rel="canonical"> tag
 770                                 $wgOut->addLink( array( 'rel' => 'canonical',
 771                                         'href' => $this->getTitle()->getLocalURL() )
 772                                 );
 773
 774                                 return true;
 775                         }
 776                 } elseif ( $rdfrom ) {
 777                         // This is an externally redirected view, from some other wiki.
 778                         // If it was reported from a trusted site, supply a backlink.
 779                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 780                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 781                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 782                                 $wgOut->setSubtitle( $s );
 783
 784                                 return true;
 785                         }
 786                 }
 787
 788                 return false;
 789         }
 790
 791         /**
 792          * Show a header specific to the namespace currently being viewed, like
 793          * [[MediaWiki:Talkpagetext]]. For Article::view().
 794          */
 795         public function showNamespaceHeader() {
 796                 global $wgOut;
 797
 798                 if ( $this->getTitle()->isTalkPage() ) {
 799                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 800                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 801                         }
 802                 }
 803         }
 804
 805         /**
 806          * Show the footer section of an ordinary page view
 807          */
 808         public function showViewFooter() {
 809                 global $wgOut, $wgUseTrackbacks;
 810
 811                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 812                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 813                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 814                 }
 815
 816                 # If we have been passed an &rcid= parameter, we want to give the user a
 817                 # chance to mark this new article as patrolled.
 818                 $this->showPatrolFooter();
 819
 820                 # Trackbacks
 821                 if ( $wgUseTrackbacks ) {
 822                         $this->addTrackbacks();
 823                 }
 824
 825                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 826
 827         }
 828
 829         /**
 830          * If patrol is possible, output a patrol UI box. This is called from the
 831          * footer section of ordinary page views. If patrol is not possible or not
 832          * desired, does nothing.
 833          */
 834         public function showPatrolFooter() {
 835                 global $wgOut, $wgRequest, $wgUser;
 836
 837                 $rcid = $wgRequest->getVal( 'rcid' );
 838
 839                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 840                         return;
 841                 }
 842
 843                 $token = $wgUser->editToken( $rcid );
 844                 $wgOut->preventClickjacking();
 845
 846                 $wgOut->addHTML(
 847                         "<div class='patrollink'>" .
 848                                 wfMsgHtml(
 849                                         'markaspatrolledlink',
 850                                         Linker::link(
 851                                                 $this->getTitle(),
 852                                                 wfMsgHtml( 'markaspatrolledtext' ),
 853                                                 array(),
 854                                                 array(
 855                                                         'action' => 'markpatrolled',
 856                                                         'rcid' => $rcid,
 857                                                         'token' => $token,
 858                                                 ),
 859                                                 array( 'known', 'noclasses' )
 860                                         )
 861                                 ) .
 862                         '</div>'
 863                 );
 864         }
 865
 866         /**
 867          * Show the error text for a missing article. For articles in the MediaWiki
 868          * namespace, show the default message text. To be called from Article::view().
 869          */
 870         public function showMissingArticle() {
 871                 global $wgOut, $wgRequest, $wgUser;
 872
 873                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 874                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 875                         $parts = explode( '/', $this->getTitle()->getText() );
 876                         $rootPart = $parts[0];
 877                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 878                         $ip = User::isIP( $rootPart );
 879
 880                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
 881                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 882                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 883                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 884                                 LogEventsList::showLogExtract(
 885                                         $wgOut,
 886                                         'block',
 887                                         $user->getUserPage()->getPrefixedText(),
 888                                         '',
 889                                         array(
 890                                                 'lim' => 1,
 891                                                 'showIfEmpty' => false,
 892                                                 'msgKey' => array(
 893                                                         'blocked-notice-logextract',
 894                                                         $user->getName() # Support GENDER in notice
 895                                                 )
 896                                         )
 897                                 );
 898                         }
 899                 }
 900
 901                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 902
 903                 # Show delete and move logs
 904                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 905                         array(  'lim' => 10,
 906                                 'conds' => array( "log_action != 'revision'" ),
 907                                 'showIfEmpty' => false,
 908                                 'msgKey' => array( 'moveddeleted-notice' ) )
 909                 );
 910
 911                 # Show error message
 912                 $oldid = $this->getOldID();
 913                 if ( $oldid ) {
 914                         $text = wfMsgNoTrans( 'missing-article',
 915                                 $this->getTitle()->getPrefixedText(),
 916                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 917                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 918                         // Use the default message text
 919                         $text = $this->getTitle()->getDefaultMessageText();
 920                 } else {
 921                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 922                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 923                         $errors = array_merge( $createErrors, $editErrors );
 924
 925                         if ( !count( $errors ) ) {
 926                                 $text = wfMsgNoTrans( 'noarticletext' );
 927                         } else {
 928                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 929                         }
 930                 }
 931                 $text = "<div class='noarticletext'>\n$text\n</div>";
 932
 933                 if ( !$this->mPage->hasViewableContent() ) {
 934                         // If there's no backing content, send a 404 Not Found
 935                         // for better machine handling of broken links.
 936                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
 937                 }
 938
 939                 $wgOut->addWikiText( $text );
 940         }
 941
 942         /**
 943          * If the revision requested for view is deleted, check permissions.
 944          * Send either an error message or a warning header to $wgOut.
 945          *
 946          * @return boolean true if the view is allowed, false if not.
 947          */
 948         public function showDeletedRevisionHeader() {
 949                 global $wgOut, $wgRequest;
 950
 951                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 952                         // Not deleted
 953                         return true;
 954                 }
 955
 956                 // If the user is not allowed to see it...
 957                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 958                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 959                                 'rev-deleted-text-permission' );
 960
 961                         return false;
 962                 // If the user needs to confirm that they want to see it...
 963                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
 964                         # Give explanation and add a link to view the revision...
 965                         $oldid = intval( $this->getOldID() );
 966                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
 967                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 968                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
 969                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 970                                 array( $msg, $link ) );
 971
 972                         return false;
 973                 // We are allowed to see...
 974                 } else {
 975                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 976                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
 977                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
 978
 979                         return true;
 980                 }
 981         }
 982
 983         /**
 984          * Execute the uncached parse for action=view
 985          */
 986         public function doViewParse() {
 987                 global $wgOut;
 988
 989                 $oldid = $this->getOldID();
 990                 $parserOptions = $this->mPage->getParserOptions();
 991
 992                 # Render printable version, use printable version cache
 993                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
 994
 995                 # Don't show section-edit links on old revisions... this way lies madness.
 996                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
 997                         $parserOptions->setEditSection( false );
 998                 }
 999
1000                 $useParserCache = $this->useParserCache( $oldid );
1001                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1002
1003                 return true;
1004         }
1005
1006         /**
1007          * Try to fetch an expired entry from the parser cache. If it is present,
1008          * output it and return true. If it is not present, output nothing and
1009          * return false. This is used as a callback function for
1010          * PoolCounter::executeProtected().
1011          *
1012          * @return boolean
1013          */
1014         public function tryDirtyCache() {
1015                 global $wgOut;
1016                 $parserCache = ParserCache::singleton();
1017                 $options = $this->mPage->getParserOptions();
1018
1019                 if ( $wgOut->isPrintable() ) {
1020                         $options->setIsPrintable( true );
1021                         $options->setEditSection( false );
1022                 }
1023
1024                 $output = $parserCache->getDirty( $this, $options );
1025
1026                 if ( $output ) {
1027                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1028                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1029                         $wgOut->setSquidMaxage( 0 );
1030                         $this->mParserOutput = $output;
1031                         $wgOut->addParserOutput( $output );
1032                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1033
1034                         return true;
1035                 } else {
1036                         wfDebugLog( 'dirty', "dirty missing\n" );
1037                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1038
1039                         return false;
1040                 }
1041         }
1042
1043         /**
1044          * View redirect
1045          *
1046          * @param $target Title|Array of destination(s) to redirect
1047          * @param $appendSubtitle Boolean [optional]
1048          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1049          * @return string containing HMTL with redirect link
1050          */
1051         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1052                 global $wgOut, $wgLang, $wgStylePath;
1053
1054                 if ( !is_array( $target ) ) {
1055                         $target = array( $target );
1056                 }
1057
1058                 $imageDir = $wgLang->getDir();
1059
1060                 if ( $appendSubtitle ) {
1061                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1062                 }
1063
1064                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1065                 $title = array_shift( $target );
1066
1067                 if ( $forceKnown ) {
1068                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1069                 } else {
1070                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1071                 }
1072
1073                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1074                 $alt = $wgLang->isRTL() ? '←' : '→';
1075                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1076                 foreach ( $target as $rt ) {
1077                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1078                         if ( $forceKnown ) {
1079                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1080                         } else {
1081                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1082                         }
1083                 }
1084
1085                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1086                 return '<div class="redirectMsg">' .
1087                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1088                         '<span class="redirectText">' . $link . '</span></div>';
1089         }
1090
1091         /**
1092          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1093          */
1094         public function addTrackbacks() {
1095                 global $wgOut;
1096
1097                 $dbr = wfGetDB( DB_SLAVE );
1098                 $tbs = $dbr->select( 'trackbacks',
1099                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1100                         array( 'tb_page' => $this->mPage->getID() )
1101                 );
1102
1103                 if ( !$dbr->numRows( $tbs ) ) {
1104                         return;
1105                 }
1106
1107                 $wgOut->preventClickjacking();
1108
1109                 $tbtext = "";
1110                 foreach ( $tbs as $o ) {
1111                         $rmvtxt = "";
1112
1113                         if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
1114                                 $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
1115                                         $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->editToken() ) );
1116                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1117                         }
1118
1119                         $tbtext .= "\n";
1120                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1121                                         $o->tb_title,
1122                                         $o->tb_url,
1123                                         $o->tb_ex,
1124                                         $o->tb_name,
1125                                         $rmvtxt );
1126                 }
1127
1128                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1129         }
1130
1131         /**
1132          * Removes trackback record for current article from trackbacks table
1133          * @deprecated since 1.19
1134          */
1135         public function deletetrackback() {
1136                 return Action::factory( 'deletetrackback', $this )->show();
1137         }
1138
1139         /**
1140          * Handle action=render
1141          */
1142
1143         public function render() {
1144                 global $wgOut;
1145
1146                 $wgOut->setArticleBodyOnly( true );
1147                 $this->view();
1148         }
1149
1150         /**
1151          * Handle action=purge
1152          */
1153         public function purge() {
1154                 return Action::factory( 'purge', $this )->show();
1155         }
1156
1157         /**
1158          * Mark this particular edit/page as patrolled
1159          * @deprecated since 1.19
1160          */
1161         public function markpatrolled() {
1162                 Action::factory( 'markpatrolled', $this )->show();
1163         }
1164
1165         /**
1166          * User-interface handler for the "watch" action.
1167          * Requires Request to pass a token as of 1.19.
1168          * @deprecated since 1.18
1169          */
1170         public function watch() {
1171                 Action::factory( 'watch', $this )->show();
1172         }
1173
1174         /**
1175          * Add this page to $wgUser's watchlist
1176          *
1177          * This is safe to be called multiple times
1178          *
1179          * @return bool true on successful watch operation
1180          * @deprecated since 1.18
1181          */
1182         public function doWatch() {
1183                 global $wgUser;
1184                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1185         }
1186
1187         /**
1188          * User interface handler for the "unwatch" action.
1189          * Requires Request to pass a token as of 1.19.
1190          * @deprecated since 1.18
1191          */
1192         public function unwatch() {
1193                 Action::factory( 'unwatch', $this )->show();
1194         }
1195
1196         /**
1197          * Stop watching a page
1198          * @return bool true on successful unwatch
1199          * @deprecated since 1.18
1200          */
1201         public function doUnwatch() {
1202                 global $wgUser;
1203                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1204         }
1205
1206         /**
1207          * action=protect handler
1208          */
1209         public function protect() {
1210                 $form = new ProtectionForm( $this );
1211                 $form->execute();
1212         }
1213
1214         /**
1215          * action=unprotect handler (alias)
1216          */
1217         public function unprotect() {
1218                 $this->protect();
1219         }
1220
1221         /**
1222          * Info about this page
1223          * Called for ?action=info when $wgAllowPageInfo is on.
1224          */
1225         public function info() {
1226                 Action::factory( 'info', $this )->show();
1227         }
1228
1229         /**
1230          * Overriden by ImagePage class, only present here to avoid a fatal error
1231          * Called for ?action=revert
1232          */
1233         public function revert() {
1234                 Action::factory( 'revert', $this )->show();
1235         }
1236
1237         /**
1238          * User interface for rollback operations
1239          */
1240         public function rollback() {
1241                 Action::factory( 'rollback', $this )->show();
1242         }
1243
1244         /**
1245          * Output a redirect back to the article.
1246          * This is typically used after an edit.
1247          *
1248          * @deprecated in 1.19; call $wgOut->redirect() directly
1249          * @param $noRedir Boolean: add redirect=no
1250          * @param $sectionAnchor String: section to redirect to, including "#"
1251          * @param $extraQuery String: extra query params
1252          */
1253         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1254                 wfDeprecated( __METHOD__ );
1255                 global $wgOut;
1256
1257                 if ( $noRedir ) {
1258                         $query = 'redirect=no';
1259                         if ( $extraQuery )
1260                                 $query .= "&$extraQuery";
1261                 } else {
1262                         $query = $extraQuery;
1263                 }
1264
1265                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1266         }
1267
1268         /**
1269          * Auto-generates a deletion reason
1270          *
1271          * @param &$hasHistory Boolean: whether the page has a history
1272          * @return mixed String containing deletion reason or empty string, or boolean false
1273          *    if no revision occurred
1274          */
1275         public function generateReason( &$hasHistory ) {
1276                 global $wgContLang;
1277
1278                 $dbw = wfGetDB( DB_MASTER );
1279                 // Get the last revision
1280                 $rev = Revision::newFromTitle( $this->getTitle() );
1281
1282                 if ( is_null( $rev ) ) {
1283                         return false;
1284                 }
1285
1286                 // Get the article's contents
1287                 $contents = $rev->getText();
1288                 $blank = false;
1289
1290                 // If the page is blank, use the text from the previous revision,
1291                 // which can only be blank if there's a move/import/protect dummy revision involved
1292                 if ( $contents == '' ) {
1293                         $prev = $rev->getPrevious();
1294
1295                         if ( $prev )    {
1296                                 $contents = $prev->getText();
1297                                 $blank = true;
1298                         }
1299                 }
1300
1301                 // Find out if there was only one contributor
1302                 // Only scan the last 20 revisions
1303                 $res = $dbw->select( 'revision', 'rev_user_text',
1304                         array( 'rev_page' => $this->mPage->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
1305                         __METHOD__,
1306                         array( 'LIMIT' => 20 )
1307                 );
1308
1309                 if ( $res === false ) {
1310                         // This page has no revisions, which is very weird
1311                         return false;
1312                 }
1313
1314                 $hasHistory = ( $res->numRows() > 1 );
1315                 $row = $dbw->fetchObject( $res );
1316
1317                 if ( $row ) { // $row is false if the only contributor is hidden
1318                         $onlyAuthor = $row->rev_user_text;
1319                         // Try to find a second contributor
1320                         foreach ( $res as $row ) {
1321                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
1322                                         $onlyAuthor = false;
1323                                         break;
1324                                 }
1325                         }
1326                 } else {
1327                         $onlyAuthor = false;
1328                 }
1329
1330                 // Generate the summary with a '$1' placeholder
1331                 if ( $blank ) {
1332                         // The current revision is blank and the one before is also
1333                         // blank. It's just not our lucky day
1334                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
1335                 } else {
1336                         if ( $onlyAuthor ) {
1337                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
1338                         } else {
1339                                 $reason = wfMsgForContent( 'excontent', '$1' );
1340                         }
1341                 }
1342
1343                 if ( $reason == '-' ) {
1344                         // Allow these UI messages to be blanked out cleanly
1345                         return '';
1346                 }
1347
1348                 // Replace newlines with spaces to prevent uglyness
1349                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
1350                 // Calculate the maximum amount of chars to get
1351                 // Max content length = max comment length - length of the comment (excl. $1)
1352                 $maxLength = 255 - ( strlen( $reason ) - 2 );
1353                 $contents = $wgContLang->truncate( $contents, $maxLength );
1354                 // Remove possible unfinished links
1355                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
1356                 // Now replace the '$1' placeholder
1357                 $reason = str_replace( '$1', $contents, $reason );
1358
1359                 return $reason;
1360         }
1361
1362
1363         /**
1364          * UI entry point for page deletion
1365          */
1366         public function delete() {
1367                 global $wgOut, $wgRequest;
1368
1369                 $confirm = $wgRequest->wasPosted() &&
1370                                 $this->getContext()->getUser()->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1371
1372                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1373                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
1374
1375                 $reason = $this->DeleteReasonList;
1376
1377                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
1378                         // Entry from drop down menu + additional comment
1379                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
1380                 } elseif ( $reason == 'other' ) {
1381                         $reason = $this->DeleteReason;
1382                 }
1383
1384                 # Flag to hide all contents of the archived revisions
1385                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $this->getContext()->getUser()->isAllowed( 'suppressrevision' );
1386
1387                 # This code desperately needs to be totally rewritten
1388
1389                 # Read-only check...
1390                 if ( wfReadOnly() ) {
1391                         $wgOut->readOnlyPage();
1392
1393                         return;
1394                 }
1395
1396                 # Check permissions
1397                 $permission_errors = $this->getTitle()->getUserPermissionsErrors( 'delete', $this->getContext()->getUser() );
1398
1399                 if ( count( $permission_errors ) > 0 ) {
1400                         $wgOut->showPermissionsErrorPage( $permission_errors );
1401
1402                         return;
1403                 }
1404
1405                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1406
1407                 # Better double-check that it hasn't been deleted yet!
1408                 $dbw = wfGetDB( DB_MASTER );
1409                 $conds = $this->getTitle()->pageCond();
1410                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1411                 if ( $latest === false ) {
1412                         $wgOut->showFatalError(
1413                                 Html::rawElement(
1414                                         'div',
1415                                         array( 'class' => 'error mw-error-cannotdelete' ),
1416                                         wfMsgExt( 'cannotdelete', array( 'parse' ),
1417                                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1418                                 )
1419                         );
1420                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1421                         LogEventsList::showLogExtract(
1422                                 $wgOut,
1423                                 'delete',
1424                                 $this->getTitle()->getPrefixedText()
1425                         );
1426
1427                         return;
1428                 }
1429
1430                 # Hack for big sites
1431                 $bigHistory = $this->mPage->isBigDeletion();
1432                 if ( $bigHistory && !$this->getTitle()->userCan( 'bigdelete' ) ) {
1433                         global $wgLang, $wgDeleteRevisionsLimit;
1434
1435                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1436                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1437
1438                         return;
1439                 }
1440
1441                 if ( $confirm ) {
1442                         $this->doDelete( $reason, $suppress );
1443
1444                         if ( $wgRequest->getCheck( 'wpWatch' ) && $this->getContext()->getUser()->isLoggedIn() ) {
1445                                 $this->doWatch();
1446                         } elseif ( $this->getTitle()->userIsWatching() ) {
1447                                 $this->doUnwatch();
1448                         }
1449
1450                         return;
1451                 }
1452
1453                 // Generate deletion reason
1454                 $hasHistory = false;
1455                 if ( !$reason ) {
1456                         $reason = $this->generateReason( $hasHistory );
1457                 }
1458
1459                 // If the page has a history, insert a warning
1460                 if ( $hasHistory && !$confirm ) {
1461                         global $wgLang;
1462
1463                         $revisions = $this->mPage->estimateRevisionCount();
1464                         // @todo FIXME: i18n issue/patchwork message
1465                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1466                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1467                                 wfMsgHtml( 'word-separator' ) . Linker::link( $this->getTitle(),
1468                                         wfMsgHtml( 'history' ),
1469                                         array( 'rel' => 'archives' ),
1470                                         array( 'action' => 'history' ) ) .
1471                                 '</strong>'
1472                         );
1473
1474                         if ( $bigHistory ) {
1475                                 global $wgDeleteRevisionsLimit;
1476                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1477                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1478                         }
1479                 }
1480
1481                 return $this->confirmDelete( $reason );
1482         }
1483
1484         /**
1485          * Output deletion confirmation dialog
1486          * @todo FIXME: Move to another file?
1487          * @param $reason String: prefilled reason
1488          */
1489         public function confirmDelete( $reason ) {
1490                 global $wgOut;
1491
1492                 wfDebug( "Article::confirmDelete\n" );
1493
1494                 $deleteBackLink = Linker::linkKnown( $this->getTitle() );
1495                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
1496                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1497                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1498
1499                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1500
1501                 if ( $this->getContext()->getUser()->isAllowed( 'suppressrevision' ) ) {
1502                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1503                                         <td></td>
1504                                         <td class='mw-input'><strong>" .
1505                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1506                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1507                                         "</strong></td>
1508                                 </tr>";
1509                 } else {
1510                         $suppress = '';
1511                 }
1512                 $checkWatch = $this->getContext()->getUser()->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1513
1514                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1515                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1516                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1517                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1518                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1519                         "<tr id=\"wpDeleteReasonListRow\">
1520                                 <td class='mw-label'>" .
1521                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1522                                 "</td>
1523                                 <td class='mw-input'>" .
1524                                         Xml::listDropDown( 'wpDeleteReasonList',
1525                                                 wfMsgForContent( 'deletereason-dropdown' ),
1526                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1527                                 "</td>
1528                         </tr>
1529                         <tr id=\"wpDeleteReasonRow\">
1530                                 <td class='mw-label'>" .
1531                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1532                                 "</td>
1533                                 <td class='mw-input'>" .
1534                                 Html::input( 'wpReason', $reason, 'text', array(
1535                                         'size' => '60',
1536                                         'maxlength' => '255',
1537                                         'tabindex' => '2',
1538                                         'id' => 'wpReason',
1539                                         'autofocus'
1540                                 ) ) .
1541                                 "</td>
1542                         </tr>";
1543
1544                 # Disallow watching if user is not logged in
1545                 if ( $this->getContext()->getUser()->isLoggedIn() ) {
1546                         $form .= "
1547                         <tr>
1548                                 <td></td>
1549                                 <td class='mw-input'>" .
1550                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1551                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1552                                 "</td>
1553                         </tr>";
1554                 }
1555
1556                 $form .= "
1557                         $suppress
1558                         <tr>
1559                                 <td></td>
1560                                 <td class='mw-submit'>" .
1561                                         Xml::submitButton( wfMsg( 'deletepage' ),
1562                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1563                                 "</td>
1564                         </tr>" .
1565                         Xml::closeElement( 'table' ) .
1566                         Xml::closeElement( 'fieldset' ) .
1567                         Html::hidden( 'wpEditToken', $this->getContext()->getUser()->editToken() ) .
1568                         Xml::closeElement( 'form' );
1569
1570                         if ( $this->getContext()->getUser()->isAllowed( 'editinterface' ) ) {
1571                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1572                                 $link = Linker::link(
1573                                         $title,
1574                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1575                                         array(),
1576                                         array( 'action' => 'edit' )
1577                                 );
1578                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1579                         }
1580
1581                 $wgOut->addHTML( $form );
1582                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1583                 LogEventsList::showLogExtract( $wgOut, 'delete',
1584                         $this->getTitle()->getPrefixedText()
1585                 );
1586         }
1587
1588         /**
1589          * Perform a deletion and output success or failure messages
1590          */
1591         public function doDelete( $reason, $suppress = false ) {
1592                 global $wgOut;
1593
1594                 $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );
1595
1596                 $error = '';
1597                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, $error ) ) {
1598                         $deleted = $this->getTitle()->getPrefixedText();
1599
1600                         $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1601                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1602
1603                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1604
1605                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1606                         $wgOut->returnToMain( false );
1607                 } else {
1608                         if ( $error == '' ) {
1609                                 $wgOut->showFatalError(
1610                                         Html::rawElement(
1611                                                 'div',
1612                                                 array( 'class' => 'error mw-error-cannotdelete' ),
1613                                                 wfMsgExt( 'cannotdelete', array( 'parse' ),
1614                                                         wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1615                                         )
1616                                 );
1617
1618                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1619
1620                                 LogEventsList::showLogExtract(
1621                                         $wgOut,
1622                                         'delete',
1623                                         $this->getTitle()->getPrefixedText()
1624                                 );
1625                         } else {
1626                                 $wgOut->showFatalError( $error );
1627                         }
1628                 }
1629         }
1630
1631         /**
1632          * Generate the navigation links when browsing through an article revisions
1633          * It shows the information as:
1634          *   Revision as of \<date\>; view current revision
1635          *   \<- Previous version | Next Version -\>
1636          *
1637          * @param $oldid String: revision ID of this article revision
1638          */
1639         public function setOldSubtitle( $oldid = 0 ) {
1640                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1641
1642                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1643                         return;
1644                 }
1645
1646                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1647
1648                 # Cascade unhide param in links for easy deletion browsing
1649                 $extraParams = array();
1650                 if ( $wgRequest->getVal( 'unhide' ) ) {
1651                         $extraParams['unhide'] = 1;
1652                 }
1653
1654                 $revision = Revision::newFromId( $oldid );
1655                 $timestamp = $revision->getTimestamp();
1656
1657                 $current = ( $oldid == $this->mPage->getLatest() );
1658                 $td = $wgLang->timeanddate( $timestamp, true );
1659                 $tddate = $wgLang->date( $timestamp, true );
1660                 $tdtime = $wgLang->time( $timestamp, true );
1661
1662                 $lnk = $current
1663                         ? wfMsgHtml( 'currentrevisionlink' )
1664                         : Linker::link(
1665                                 $this->getTitle(),
1666                                 wfMsgHtml( 'currentrevisionlink' ),
1667                                 array(),
1668                                 $extraParams,
1669                                 array( 'known', 'noclasses' )
1670                         );
1671                 $curdiff = $current
1672                         ? wfMsgHtml( 'diff' )
1673                         : Linker::link(
1674                                 $this->getTitle(),
1675                                 wfMsgHtml( 'diff' ),
1676                                 array(),
1677                                 array(
1678                                         'diff' => 'cur',
1679                                         'oldid' => $oldid
1680                                 ) + $extraParams,
1681                                 array( 'known', 'noclasses' )
1682                         );
1683                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1684                 $prevlink = $prev
1685                         ? Linker::link(
1686                                 $this->getTitle(),
1687                                 wfMsgHtml( 'previousrevision' ),
1688                                 array(),
1689                                 array(
1690                                         'direction' => 'prev',
1691                                         'oldid' => $oldid
1692                                 ) + $extraParams,
1693                                 array( 'known', 'noclasses' )
1694                         )
1695                         : wfMsgHtml( 'previousrevision' );
1696                 $prevdiff = $prev
1697                         ? Linker::link(
1698                                 $this->getTitle(),
1699                                 wfMsgHtml( 'diff' ),
1700                                 array(),
1701                                 array(
1702                                         'diff' => 'prev',
1703                                         'oldid' => $oldid
1704                                 ) + $extraParams,
1705                                 array( 'known', 'noclasses' )
1706                         )
1707                         : wfMsgHtml( 'diff' );
1708                 $nextlink = $current
1709                         ? wfMsgHtml( 'nextrevision' )
1710                         : Linker::link(
1711                                 $this->getTitle(),
1712                                 wfMsgHtml( 'nextrevision' ),
1713                                 array(),
1714                                 array(
1715                                         'direction' => 'next',
1716                                         'oldid' => $oldid
1717                                 ) + $extraParams,
1718                                 array( 'known', 'noclasses' )
1719                         );
1720                 $nextdiff = $current
1721                         ? wfMsgHtml( 'diff' )
1722                         : Linker::link(
1723                                 $this->getTitle(),
1724                                 wfMsgHtml( 'diff' ),
1725                                 array(),
1726                                 array(
1727                                         'diff' => 'next',
1728                                         'oldid' => $oldid
1729                                 ) + $extraParams,
1730                                 array( 'known', 'noclasses' )
1731                         );
1732
1733                 $cdel = '';
1734
1735                 // User can delete revisions or view deleted revisions...
1736                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1737                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1738                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
1739                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
1740                         } else {
1741                                 $query = array(
1742                                         'type'   => 'revision',
1743                                         'target' => $this->getTitle()->getPrefixedDbkey(),
1744                                         'ids'    => $oldid
1745                                 );
1746                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1747                         }
1748                         $cdel .= ' ';
1749                 }
1750
1751                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1752                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1753
1754                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1755                         ? 'revision-info-current'
1756                         : 'revision-info';
1757
1758                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
1759                         wfMsgExt(
1760                                 $infomsg,
1761                                 array( 'parseinline', 'replaceafter' ),
1762                                 $td,
1763                                 $userlinks,
1764                                 $revision->getID(),
1765                                 $tddate,
1766                                 $tdtime,
1767                                 $revision->getUser()
1768                         ) .
1769                         "</div>\n" .
1770                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1771                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
1772
1773                 $wgOut->setSubtitle( $r );
1774         }
1775
1776         /* Caching functions */
1777
1778         /**
1779          * checkLastModified returns true if it has taken care of all
1780          * output to the client that is necessary for this request.
1781          * (that is, it has sent a cached version of the page)
1782          *
1783          * @return boolean true if cached version send, false otherwise
1784          */
1785         protected function tryFileCache() {
1786                 static $called = false;
1787
1788                 if ( $called ) {
1789                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1790                         return false;
1791                 }
1792
1793                 $called = true;
1794                 if ( $this->isFileCacheable() ) {
1795                         $cache = new HTMLFileCache( $this->getTitle() );
1796                         if ( $cache->isFileCacheGood( $this->mPage->getTouched() ) ) {
1797                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1798                                 $cache->loadFromFileCache();
1799                                 return true;
1800                         } else {
1801                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1802                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1803                         }
1804                 } else {
1805                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1806                 }
1807
1808                 return false;
1809         }
1810
1811         /**
1812          * Check if the page can be cached
1813          * @return bool
1814          */
1815         public function isFileCacheable() {
1816                 $cacheable = false;
1817
1818                 if ( HTMLFileCache::useFileCache() ) {
1819                         $cacheable = $this->mPage->getID() && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1820                         // Extension may have reason to disable file caching on some pages.
1821                         if ( $cacheable ) {
1822                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1823                         }
1824                 }
1825
1826                 return $cacheable;
1827         }
1828
1829         /**#@-*/
1830
1831         /**
1832          * Add the primary page-view wikitext to the output buffer
1833          * Saves the text into the parser cache if possible.
1834          * Updates templatelinks if it is out of date.
1835          *
1836          * @param $text String
1837          * @param $cache Boolean
1838          * @param $parserOptions mixed ParserOptions object, or boolean false
1839          */
1840         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
1841                 global $wgOut;
1842
1843                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
1844
1845                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
1846
1847                 $wgOut->addParserOutput( $this->mParserOutput );
1848         }
1849
1850         /**
1851          * Lightweight method to get the parser output for a page, checking the parser cache
1852          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1853          * consider, so it's not appropriate to use there.
1854          *
1855          * @since 1.16 (r52326) for LiquidThreads
1856          *
1857          * @param $oldid mixed integer Revision ID or null
1858          * @param $user User The relevant user
1859          * @return ParserOutput or false if the given revsion ID is not found
1860          */
1861         public function getParserOutput( $oldid = null, User $user = null ) {
1862                 global $wgEnableParserCache, $wgUser;
1863                 $user = is_null( $user ) ? $wgUser : $user;
1864
1865                 // Should the parser cache be used?
1866                 $useParserCache = $wgEnableParserCache &&
1867                         $user->getStubThreshold() == 0 &&
1868                         $this->mPage->exists() &&
1869                         $oldid === null;
1870
1871                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1872
1873                 if ( $user->getStubThreshold() ) {
1874                         wfIncrStats( 'pcache_miss_stub' );
1875                 }
1876
1877                 if ( $useParserCache ) {
1878                         $parserOutput = ParserCache::singleton()->get( $this, $this->mPage->getParserOptions() );
1879                         if ( $parserOutput !== false ) {
1880                                 return $parserOutput;
1881                         }
1882                 }
1883
1884                 // Cache miss; parse and output it.
1885                 if ( $oldid === null ) {
1886                         $text = $this->mPage->getRawText();
1887                 } else {
1888                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
1889                         if ( $rev === null ) {
1890                                 return false;
1891                         }
1892                         $text = $rev->getText();
1893                 }
1894
1895                 return $this->getOutputFromWikitext( $text, $useParserCache );
1896         }
1897
1898         /**
1899          * This does all the heavy lifting for outputWikitext, except it returns the parser
1900          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
1901          * say, embedding thread pages within a discussion system (LiquidThreads)
1902          *
1903          * @param $text string
1904          * @param $cache boolean
1905          * @param $parserOptions parsing options, defaults to false
1906          * @return ParserOutput
1907          */
1908         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
1909                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
1910
1911                 if ( !$parserOptions ) {
1912                         $parserOptions = $this->mPage->getParserOptions();
1913                 }
1914
1915                 $time = - wfTime();
1916                 $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
1917                         $parserOptions, true, true, $this->getRevIdFetched() );
1918                 $time += wfTime();
1919
1920                 # Timing hack
1921                 if ( $time > 3 ) {
1922                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1923                                 $this->getTitle()->getPrefixedDBkey() ) );
1924                 }
1925
1926                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
1927                         $parserCache = ParserCache::singleton();
1928                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
1929                 }
1930
1931                 // Make sure file cache is not used on uncacheable content.
1932                 // Output that has magic words in it can still use the parser cache
1933                 // (if enabled), though it will generally expire sooner.
1934                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
1935                         $wgUseFileCache = false;
1936                 }
1937
1938                 if ( $this->isCurrent() ) {
1939                         $this->mPage->doCascadeProtectionUpdates( $this->mParserOutput );
1940                 }
1941
1942                 return $this->mParserOutput;
1943         }
1944
1945         /**
1946          * Sets the context this Article is executed in
1947          *
1948          * @param $context RequestContext
1949          * @since 1.18
1950          */
1951         public function setContext( $context ) {
1952                 $this->mContext = $context;
1953         }
1954
1955         /**
1956          * Gets the context this Article is executed in
1957          *
1958          * @return RequestContext
1959          * @since 1.18
1960          */
1961         public function getContext() {
1962                 if ( $this->mContext instanceof RequestContext ) {
1963                         return $this->mContext;
1964                 } else {
1965                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1966                         return RequestContext::getMain();
1967                 }
1968         }
1969
1970         /**
1971          * Use PHP's magic __get handler to handle accessing of
1972          * raw WikiPage fields for backwards compatibility.
1973          *
1974          * @param $fname String Field name
1975          */
1976         public function __get( $fname ) {
1977                 if ( property_exists( $this->mPage, $fname ) ) {
1978                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1979                         return $this->mPage->$fname;
1980                 }
1981         trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1982         }
1983
1984         /**
1985          * Use PHP's magic __set handler to handle setting of
1986          * raw WikiPage fields for backwards compatibility.
1987          *
1988          * @param $fname String Field name
1989          * @param $fvalue mixed New value
1990          * @param $args Array Arguments to the method
1991          */
1992         public function __set( $fname, $fvalue ) {
1993                 if ( property_exists( $this->mPage, $fname ) ) {
1994                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1995                         $this->mPage->$fname = $fvalue;
1996                 // Note: extensions may want to toss on new fields
1997                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1998                         $this->mPage->$fname = $fvalue;
1999                 } else {
2000                         trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2001                 }
2002         }
2003
2004         /**
2005          * Use PHP's magic __call handler to transform instance calls to
2006          * WikiPage functions for backwards compatibility.
2007          *
2008          * @param $fname String Name of called method
2009          * @param $args Array Arguments to the method
2010          */
2011         public function __call( $fname, $args ) {
2012                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2013                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2014                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2015                 }
2016         trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2017         }
2018
2019         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2020         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2021                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
2022         }
2023
2024         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2025                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2026         }
2027
2028         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2029                 global $wgUser;
2030                 $user = is_null( $user ) ? $wgUser : $user;
2031                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2032         }
2033
2034         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2035                 global $wgUser;
2036                 $guser = is_null( $guser ) ? $wgUser : $guser;
2037                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2038         }
2039
2040         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2041         public static function selectFields() {
2042                 return WikiPage::selectFields();
2043         }
2044
2045         public static function onArticleCreate( $title ) {
2046                 return WikiPage::onArticleCreate( $title );
2047         }
2048
2049         public static function onArticleDelete( $title ) {
2050                 return WikiPage::onArticleDelete( $title );
2051         }
2052
2053         public static function onArticleEdit( $title ) {
2054                 return WikiPage::onArticleEdit( $title );
2055         }
2056
2057         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2058                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2059         }
2060         // ******
2061 }
2062
2063 class PoolWorkArticleView extends PoolCounterWork {
2064
2065         /**
2066          * @var Article
2067          */
2068         private $mArticle;
2069
2070         function __construct( $article, $key, $useParserCache, $parserOptions ) {
2071                 parent::__construct( 'ArticleView', $key );
2072                 $this->mArticle = $article;
2073                 $this->cacheable = $useParserCache;
2074                 $this->parserOptions = $parserOptions;
2075         }
2076
2077         function doWork() {
2078                 return $this->mArticle->doViewParse();
2079         }
2080
2081         function getCachedWork() {
2082                 global $wgOut;
2083
2084                 $parserCache = ParserCache::singleton();
2085                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
2086
2087                 if ( $this->mArticle->mParserOutput !== false ) {
2088                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
2089                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
2090                         # Ensure that UI elements requiring revision ID have
2091                         # the correct version information.
2092                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
2093                         return true;
2094                 }
2095                 return false;
2096         }
2097
2098         function fallback() {
2099                 return $this->mArticle->tryDirtyCache();
2100         }
2101
2102         /**
2103          * @param  $status Status
2104          */
2105         function error( $status ) {
2106                 global $wgOut;
2107
2108                 $wgOut->clearHTML(); // for release() errors
2109                 $wgOut->enableClientCache( false );
2110                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2111
2112                 $errortext = $status->getWikiText( false, 'view-pool-error' );
2113                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
2114
2115                 return false;
2116         }
2117 }