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