includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class Article implements Page {
  37         /** @var IContextSource The context this Article is executed in */
  38         protected $mContext;
  39
  40         /** @var WikiPage The WikiPage object of this instance */
  41         protected $mPage;
  42
  43         /** @var ParserOptions ParserOptions object for $wgUser articles */
  44         public $mParserOptions;
  45
  46         /**
  47          * @var string Text of the revision we are working on
  48          * @todo BC cruft
  49          */
  50         public $mContent;
  51
  52         /**
  53          * @var Content Content of the revision we are working on
  54          * @since 1.21
  55          */
  56         public $mContentObject;
  57
  58         /** @var bool Is the content ($mContent) already loaded? */
  59         public $mContentLoaded = false;
  60
  61         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  62         public $mOldId;
  63
  64         /** @var Title Title from which we were redirected here */
  65         public $mRedirectedFrom = null;
  66
  67         /** @var string|bool URL to redirect to or false if none */
  68         public $mRedirectUrl = false;
  69
  70         /** @var int Revision ID of revision we are working on */
  71         public $mRevIdFetched = 0;
  72
  73         /** @var Revision Revision we are working on */
  74         public $mRevision = null;
  75
  76         /** @var ParserOutput */
  77         public $mParserOutput;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param Title $title Reference to a Title object.
  82          * @param int $oldId Revision ID, null to fetch from request, zero for current
  83          */
  84         public function __construct( Title $title, $oldId = null ) {
  85                 $this->mOldId = $oldId;
  86                 $this->mPage = $this->newPage( $title );
  87         }
  88
  89         /**
  90          * @param Title $title
  91          * @return WikiPage
  92          */
  93         protected function newPage( Title $title ) {
  94                 return new WikiPage( $title );
  95         }
  96
  97         /**
  98          * Constructor from a page id
  99          * @param int $id Article ID to load
 100          * @return Article|null
 101          */
 102         public static function newFromID( $id ) {
 103                 $t = Title::newFromID( $id );
 104                 # @todo FIXME: Doesn't inherit right
 105                 return $t == null ? null : new self( $t );
 106                 # return $t == null ? null : new static( $t ); // PHP 5.3
 107         }
 108
 109         /**
 110          * Create an Article object of the appropriate class for the given page.
 111          *
 112          * @param Title $title
 113          * @param IContextSource $context
 114          * @return Article
 115          */
 116         public static function newFromTitle( $title, IContextSource $context ) {
 117                 if ( NS_MEDIA == $title->getNamespace() ) {
 118                         // FIXME: where should this go?
 119                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 120                 }
 121
 122                 $page = null;
 123                 Hooks::run( 'ArticleFromTitle', array( &$title, &$page, $context ) );
 124                 if ( !$page ) {
 125                         switch ( $title->getNamespace() ) {
 126                                 case NS_FILE:
 127                                         $page = new ImagePage( $title );
 128                                         break;
 129                                 case NS_CATEGORY:
 130                                         $page = new CategoryPage( $title );
 131                                         break;
 132                                 default:
 133                                         $page = new Article( $title );
 134                         }
 135                 }
 136                 $page->setContext( $context );
 137
 138                 return $page;
 139         }
 140
 141         /**
 142          * Create an Article object of the appropriate class for the given page.
 143          *
 144          * @param WikiPage $page
 145          * @param IContextSource $context
 146          * @return Article
 147          */
 148         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 149                 $article = self::newFromTitle( $page->getTitle(), $context );
 150                 $article->mPage = $page; // override to keep process cached vars
 151                 return $article;
 152         }
 153
 154         /**
 155          * Tell the page view functions that this view was redirected
 156          * from another page on the wiki.
 157          * @param Title $from
 158          */
 159         public function setRedirectedFrom( Title $from ) {
 160                 $this->mRedirectedFrom = $from;
 161         }
 162
 163         /**
 164          * Get the title object of the article
 165          *
 166          * @return Title Title object of this page
 167          */
 168         public function getTitle() {
 169                 return $this->mPage->getTitle();
 170         }
 171
 172         /**
 173          * Get the WikiPage object of this instance
 174          *
 175          * @since 1.19
 176          * @return WikiPage
 177          */
 178         public function getPage() {
 179                 return $this->mPage;
 180         }
 181
 182         /**
 183          * Clear the object
 184          */
 185         public function clear() {
 186                 $this->mContentLoaded = false;
 187
 188                 $this->mRedirectedFrom = null; # Title object if set
 189                 $this->mRevIdFetched = 0;
 190                 $this->mRedirectUrl = false;
 191
 192                 $this->mPage->clear();
 193         }
 194
 195         /**
 196          * Note that getContent/loadContent do not follow redirects anymore.
 197          * If you need to fetch redirectable content easily, try
 198          * the shortcut in WikiPage::getRedirectTarget()
 199          *
 200          * This function has side effects! Do not use this function if you
 201          * only want the real revision text if any.
 202          *
 203          * @deprecated since 1.21; use WikiPage::getContent() instead
 204          *
 205          * @return string Return the text of this revision
 206          */
 207         public function getContent() {
 208                 ContentHandler::deprecated( __METHOD__, '1.21' );
 209                 $content = $this->getContentObject();
 210                 return ContentHandler::getContentText( $content );
 211         }
 212
 213         /**
 214          * Returns a Content object representing the pages effective display content,
 215          * not necessarily the revision's content!
 216          *
 217          * Note that getContent/loadContent do not follow redirects anymore.
 218          * If you need to fetch redirectable content easily, try
 219          * the shortcut in WikiPage::getRedirectTarget()
 220          *
 221          * This function has side effects! Do not use this function if you
 222          * only want the real revision text if any.
 223          *
 224          * @return Content Return the content of this revision
 225          *
 226          * @since 1.21
 227          */
 228         protected function getContentObject() {
 229
 230                 if ( $this->mPage->getID() === 0 ) {
 231                         # If this is a MediaWiki:x message, then load the messages
 232                         # and return the message value for x.
 233                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 234                                 $text = $this->getTitle()->getDefaultMessageText();
 235                                 if ( $text === false ) {
 236                                         $text = '';
 237                                 }
 238
 239                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 240                         } else {
 241                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 242                                 $content = new MessageContent( $message, null, 'parsemag' );
 243                         }
 244                 } else {
 245                         $this->fetchContentObject();
 246                         $content = $this->mContentObject;
 247                 }
 248
 249                 return $content;
 250         }
 251
 252         /**
 253          * @return int The oldid of the article that is to be shown, 0 for the current revision
 254          */
 255         public function getOldID() {
 256                 if ( is_null( $this->mOldId ) ) {
 257                         $this->mOldId = $this->getOldIDFromRequest();
 258                 }
 259
 260                 return $this->mOldId;
 261         }
 262
 263         /**
 264          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 265          *
 266          * @return int The old id for the request
 267          */
 268         public function getOldIDFromRequest() {
 269                 $this->mRedirectUrl = false;
 270
 271                 $request = $this->getContext()->getRequest();
 272                 $oldid = $request->getIntOrNull( 'oldid' );
 273
 274                 if ( $oldid === null ) {
 275                         return 0;
 276                 }
 277
 278                 if ( $oldid !== 0 ) {
 279                         # Load the given revision and check whether the page is another one.
 280                         # In that case, update this instance to reflect the change.
 281                         if ( $oldid === $this->mPage->getLatest() ) {
 282                                 $this->mRevision = $this->mPage->getRevision();
 283                         } else {
 284                                 $this->mRevision = Revision::newFromId( $oldid );
 285                                 if ( $this->mRevision !== null ) {
 286                                         // Revision title doesn't match the page title given?
 287                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 288                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 289                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 290                                         }
 291                                 }
 292                         }
 293                 }
 294
 295                 if ( $request->getVal( 'direction' ) == 'next' ) {
 296                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 297                         if ( $nextid ) {
 298                                 $oldid = $nextid;
 299                                 $this->mRevision = null;
 300                         } else {
 301                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 302                         }
 303                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 304                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 305                         if ( $previd ) {
 306                                 $oldid = $previd;
 307                                 $this->mRevision = null;
 308                         }
 309                 }
 310
 311                 return $oldid;
 312         }
 313
 314         /**
 315          * Load the revision (including text) into this object
 316          *
 317          * @deprecated since 1.19; use fetchContent()
 318          */
 319         function loadContent() {
 320                 wfDeprecated( __METHOD__, '1.19' );
 321                 $this->fetchContent();
 322         }
 323
 324         /**
 325          * Get text of an article from database
 326          * Does *NOT* follow redirects.
 327          *
 328          * @protected
 329          * @note This is really internal functionality that should really NOT be
 330          * used by other functions. For accessing article content, use the WikiPage
 331          * class, especially WikiBase::getContent(). However, a lot of legacy code
 332          * uses this method to retrieve page text from the database, so the function
 333          * has to remain public for now.
 334          *
 335          * @return string|bool String containing article contents, or false if null
 336          * @deprecated since 1.21, use WikiPage::getContent() instead
 337          */
 338         function fetchContent() { #BC cruft!
 339                 ContentHandler::deprecated( __METHOD__, '1.21' );
 340
 341                 if ( $this->mContentLoaded && $this->mContent ) {
 342                         return $this->mContent;
 343                 }
 344
 345
 346                 $content = $this->fetchContentObject();
 347
 348                 if ( !$content ) {
 349                         return false;
 350                 }
 351
 352                 // @todo Get rid of mContent everywhere!
 353                 $this->mContent = ContentHandler::getContentText( $content );
 354                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 355
 356
 357                 return $this->mContent;
 358         }
 359
 360         /**
 361          * Get text content object
 362          * Does *NOT* follow redirects.
 363          * @todo When is this null?
 364          *
 365          * @note Code that wants to retrieve page content from the database should
 366          * use WikiPage::getContent().
 367          *
 368          * @return Content|null|bool
 369          *
 370          * @since 1.21
 371          */
 372         protected function fetchContentObject() {
 373                 if ( $this->mContentLoaded ) {
 374                         return $this->mContentObject;
 375                 }
 376
 377
 378                 $this->mContentLoaded = true;
 379                 $this->mContent = null;
 380
 381                 $oldid = $this->getOldID();
 382
 383                 # Pre-fill content with error message so that if something
 384                 # fails we'll have something telling us what we intended.
 385                 //XXX: this isn't page content but a UI message. horrible.
 386                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 387
 388                 if ( $oldid ) {
 389                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 390                         if ( !$this->mRevision ) {
 391                                 $this->mRevision = Revision::newFromId( $oldid );
 392                                 if ( !$this->mRevision ) {
 393                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 394                                         return false;
 395                                 }
 396                         }
 397                 } else {
 398                         if ( !$this->mPage->getLatest() ) {
 399                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 400                                         $this->getTitle()->getPrefixedText() . "\n" );
 401                                 return false;
 402                         }
 403
 404                         $this->mRevision = $this->mPage->getRevision();
 405
 406                         if ( !$this->mRevision ) {
 407                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " .
 408                                         $this->mPage->getLatest() . "\n" );
 409                                 return false;
 410                         }
 411                 }
 412
 413                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 414                 // We should instead work with the Revision object when we need it...
 415                 // Loads if user is allowed
 416                 $this->mContentObject = $this->mRevision->getContent(
 417                         Revision::FOR_THIS_USER,
 418                         $this->getContext()->getUser()
 419                 );
 420                 $this->mRevIdFetched = $this->mRevision->getId();
 421
 422                 Hooks::run( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 423
 424
 425                 return $this->mContentObject;
 426         }
 427
 428         /**
 429          * Returns true if the currently-referenced revision is the current edit
 430          * to this page (and it exists).
 431          * @return bool
 432          */
 433         public function isCurrent() {
 434                 # If no oldid, this is the current version.
 435                 if ( $this->getOldID() == 0 ) {
 436                         return true;
 437                 }
 438
 439                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 440         }
 441
 442         /**
 443          * Get the fetched Revision object depending on request parameters or null
 444          * on failure.
 445          *
 446          * @since 1.19
 447          * @return Revision|null
 448          */
 449         public function getRevisionFetched() {
 450                 $this->fetchContentObject();
 451
 452                 return $this->mRevision;
 453         }
 454
 455         /**
 456          * Use this to fetch the rev ID used on page views
 457          *
 458          * @return int Revision ID of last article revision
 459          */
 460         public function getRevIdFetched() {
 461                 if ( $this->mRevIdFetched ) {
 462                         return $this->mRevIdFetched;
 463                 } else {
 464                         return $this->mPage->getLatest();
 465                 }
 466         }
 467
 468         /**
 469          * This is the default action of the index.php entry point: just view the
 470          * page of the given title.
 471          */
 472         public function view() {
 473                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar, $wgMaxRedirects;
 474
 475
 476                 # Get variables from query string
 477                 # As side effect this will load the revision and update the title
 478                 # in a revision ID is passed in the request, so this should remain
 479                 # the first call of this method even if $oldid is used way below.
 480                 $oldid = $this->getOldID();
 481
 482                 $user = $this->getContext()->getUser();
 483                 # Another whitelist check in case getOldID() is altering the title
 484                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 485                 if ( count( $permErrors ) ) {
 486                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 487                         throw new PermissionsError( 'read', $permErrors );
 488                 }
 489
 490                 $outputPage = $this->getContext()->getOutput();
 491                 # getOldID() may as well want us to redirect somewhere else
 492                 if ( $this->mRedirectUrl ) {
 493                         $outputPage->redirect( $this->mRedirectUrl );
 494                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 495
 496                         return;
 497                 }
 498
 499                 # If we got diff in the query, we want to see a diff page instead of the article.
 500                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 501                         wfDebug( __METHOD__ . ": showing diff page\n" );
 502                         $this->showDiffPage();
 503
 504                         return;
 505                 }
 506
 507                 # Set page title (may be overridden by DISPLAYTITLE)
 508                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 509
 510                 $outputPage->setArticleFlag( true );
 511                 # Allow frames by default
 512                 $outputPage->allowClickjacking();
 513
 514                 $parserCache = ParserCache::singleton();
 515
 516                 $parserOptions = $this->getParserOptions();
 517                 # Render printable version, use printable version cache
 518                 if ( $outputPage->isPrintable() ) {
 519                         $parserOptions->setIsPrintable( true );
 520                         $parserOptions->setEditSection( false );
 521                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 522                         $parserOptions->setEditSection( false );
 523                 }
 524
 525                 # Try client and file cache
 526                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 527                         if ( $wgUseETag ) {
 528                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 529                         }
 530
 531                         # Use the greatest of the page's timestamp or the timestamp of any
 532                         # redirect in the chain (bug 67849)
 533                         $timestamp = $this->mPage->getTouched();
 534                         if ( isset( $this->mRedirectedFrom ) ) {
 535                                 $timestamp = max( $timestamp, $this->mRedirectedFrom->getTouched() );
 536
 537                                 # If there can be more than one redirect in the chain, we have
 538                                 # to go through the whole chain too in case an intermediate
 539                                 # redirect was changed.
 540                                 if ( $wgMaxRedirects > 1 ) {
 541                                         $titles = Revision::newFromTitle( $this->mRedirectedFrom )
 542                                                 ->getContent( Revision::FOR_THIS_USER, $user )
 543                                                 ->getRedirectChain();
 544                                         $thisTitle = $this->getTitle();
 545                                         foreach ( $titles as $title ) {
 546                                                 if ( Title::compare( $title, $thisTitle ) === 0 ) {
 547                                                         break;
 548                                                 }
 549                                                 $timestamp = max( $timestamp, $title->getTouched() );
 550                                         }
 551                                 }
 552                         }
 553
 554                         # Is it client cached?
 555                         if ( $outputPage->checkLastModified( $timestamp ) ) {
 556                                 wfDebug( __METHOD__ . ": done 304\n" );
 557
 558                                 return;
 559                         # Try file cache
 560                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 561                                 wfDebug( __METHOD__ . ": done file cache\n" );
 562                                 # tell wgOut that output is taken care of
 563                                 $outputPage->disable();
 564                                 $this->mPage->doViewUpdates( $user, $oldid );
 565
 566                                 return;
 567                         }
 568                 }
 569
 570                 # Should the parser cache be used?
 571                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 572                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 573                 if ( $user->getStubThreshold() ) {
 574                         wfIncrStats( 'pcache_miss_stub' );
 575                 }
 576
 577                 $this->showRedirectedFromHeader();
 578                 $this->showNamespaceHeader();
 579
 580                 # Iterate through the possible ways of constructing the output text.
 581                 # Keep going until $outputDone is set, or we run out of things to do.
 582                 $pass = 0;
 583                 $outputDone = false;
 584                 $this->mParserOutput = false;
 585
 586                 while ( !$outputDone && ++$pass ) {
 587                         switch ( $pass ) {
 588                                 case 1:
 589                                         Hooks::run( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 590                                         break;
 591                                 case 2:
 592                                         # Early abort if the page doesn't exist
 593                                         if ( !$this->mPage->exists() ) {
 594                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 595                                                 $this->showMissingArticle();
 596                                                 $this->mPage->doViewUpdates( $user );
 597                                                 return;
 598                                         }
 599
 600                                         # Try the parser cache
 601                                         if ( $useParserCache ) {
 602                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 603
 604                                                 if ( $this->mParserOutput !== false ) {
 605                                                         if ( $oldid ) {
 606                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 607                                                                 $this->setOldSubtitle( $oldid );
 608                                                         } else {
 609                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 610                                                         }
 611                                                         $outputPage->addParserOutput( $this->mParserOutput );
 612                                                         # Ensure that UI elements requiring revision ID have
 613                                                         # the correct version information.
 614                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 615                                                         # Preload timestamp to avoid a DB hit
 616                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 617                                                         if ( $cachedTimestamp !== null ) {
 618                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 619                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 620                                                         }
 621                                                         $outputDone = true;
 622                                                 }
 623                                         }
 624                                         break;
 625                                 case 3:
 626                                         # This will set $this->mRevision if needed
 627                                         $this->fetchContentObject();
 628
 629                                         # Are we looking at an old revision
 630                                         if ( $oldid && $this->mRevision ) {
 631                                                 $this->setOldSubtitle( $oldid );
 632
 633                                                 if ( !$this->showDeletedRevisionHeader() ) {
 634                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 635                                                         return;
 636                                                 }
 637                                         }
 638
 639                                         # Ensure that UI elements requiring revision ID have
 640                                         # the correct version information.
 641                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 642                                         # Preload timestamp to avoid a DB hit
 643                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 644
 645                                         # Pages containing custom CSS or JavaScript get special treatment
 646                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 647                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 648                                                 $this->showCssOrJsPage();
 649                                                 $outputDone = true;
 650                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 651                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 652
 653                                                 # Allow extensions do their own custom view for certain pages
 654                                                 $outputDone = true;
 655                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 656                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 657
 658                                                 # Allow extensions do their own custom view for certain pages
 659                                                 $outputDone = true;
 660                                         }
 661                                         break;
 662                                 case 4:
 663                                         # Run the parse, protected by a pool counter
 664                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 665
 666                                         $content = $this->getContentObject();
 667                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 668                                                 $this->getRevIdFetched(), $useParserCache, $content );
 669
 670                                         if ( !$poolArticleView->execute() ) {
 671                                                 $error = $poolArticleView->getError();
 672                                                 if ( $error ) {
 673                                                         $outputPage->clearHTML(); // for release() errors
 674                                                         $outputPage->enableClientCache( false );
 675                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 676
 677                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 678                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 679                                                 }
 680                                                 # Connection or timeout error
 681                                                 return;
 682                                         }
 683
 684                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 685                                         $outputPage->addParserOutput( $this->mParserOutput );
 686                                         if ( $content->getRedirectTarget() ) {
 687                                                 $outputPage->addSubtitle(
 688                                                         "<span id=\"redirectsub\">" . wfMessage( 'redirectpagesub' )->parse() . "</span>"
 689                                                 );
 690                                         }
 691
 692                                         # Don't cache a dirty ParserOutput object
 693                                         if ( $poolArticleView->getIsDirty() ) {
 694                                                 $outputPage->setSquidMaxage( 0 );
 695                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 696                                                         "sending anyway due to pool overload-->\n" );
 697                                         }
 698
 699                                         $outputDone = true;
 700                                         break;
 701                                 # Should be unreachable, but just in case...
 702                                 default:
 703                                         break 2;
 704                         }
 705                 }
 706
 707                 # Get the ParserOutput actually *displayed* here.
 708                 # Note that $this->mParserOutput is the *current* version output.
 709                 $pOutput = ( $outputDone instanceof ParserOutput )
 710                         ? $outputDone // object fetched by hook
 711                         : $this->mParserOutput;
 712
 713                 # Adjust title for main page & pages with displaytitle
 714                 if ( $pOutput ) {
 715                         $this->adjustDisplayTitle( $pOutput );
 716                 }
 717
 718                 # For the main page, overwrite the <title> element with the con-
 719                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 720                 # that's not empty).
 721                 # This message always exists because it is in the i18n files
 722                 if ( $this->getTitle()->isMainPage() ) {
 723                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 724                         if ( !$msg->isDisabled() ) {
 725                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 726                         }
 727                 }
 728
 729                 # Check for any __NOINDEX__ tags on the page using $pOutput
 730                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 731                 $outputPage->setIndexPolicy( $policy['index'] );
 732                 $outputPage->setFollowPolicy( $policy['follow'] );
 733
 734                 $this->showViewFooter();
 735                 $this->mPage->doViewUpdates( $user, $oldid );
 736
 737                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 738
 739         }
 740
 741         /**
 742          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 743          * @param ParserOutput $pOutput
 744          */
 745         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 746                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 747                 $titleText = $pOutput->getTitleText();
 748                 if ( strval( $titleText ) !== '' ) {
 749                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 750                 }
 751         }
 752
 753         /**
 754          * Show a diff page according to current request variables. For use within
 755          * Article::view() only, other callers should use the DifferenceEngine class.
 756          *
 757          * @todo Make protected
 758          */
 759         public function showDiffPage() {
 760                 $request = $this->getContext()->getRequest();
 761                 $user = $this->getContext()->getUser();
 762                 $diff = $request->getVal( 'diff' );
 763                 $rcid = $request->getVal( 'rcid' );
 764                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 765                 $purge = $request->getVal( 'action' ) == 'purge';
 766                 $unhide = $request->getInt( 'unhide' ) == 1;
 767                 $oldid = $this->getOldID();
 768
 769                 $rev = $this->getRevisionFetched();
 770
 771                 if ( !$rev ) {
 772                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 773                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 774                                 ->params( $oldid )
 775                                 ->numParams( 1 )
 776                                 ->parseAsBlock();
 777                         $this->getContext()->getOutput()->addHtml( $msg );
 778                         return;
 779                 }
 780
 781                 $contentHandler = $rev->getContentHandler();
 782                 $de = $contentHandler->createDifferenceEngine(
 783                         $this->getContext(),
 784                         $oldid,
 785                         $diff,
 786                         $rcid,
 787                         $purge,
 788                         $unhide
 789                 );
 790
 791                 // DifferenceEngine directly fetched the revision:
 792                 $this->mRevIdFetched = $de->mNewid;
 793                 $de->showDiffPage( $diffOnly );
 794
 795                 // Run view updates for the newer revision being diffed (and shown
 796                 // below the diff if not $diffOnly).
 797                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 798                 // New can be false, convert it to 0 - this conveniently means the latest revision
 799                 $this->mPage->doViewUpdates( $user, (int)$new );
 800         }
 801
 802         /**
 803          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 804          * Article::view() only.
 805          *
 806          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 807          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 808          * more flexibility.
 809          *
 810          * @param bool $showCacheHint Whether to show a message telling the user
 811          *   to clear the browser cache (default: true).
 812          */
 813         protected function showCssOrJsPage( $showCacheHint = true ) {
 814                 $outputPage = $this->getContext()->getOutput();
 815
 816                 if ( $showCacheHint ) {
 817                         $dir = $this->getContext()->getLanguage()->getDir();
 818                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
 819
 820                         $outputPage->wrapWikiMsg(
 821                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 822                                 'clearyourcache'
 823                         );
 824                 }
 825
 826                 $this->fetchContentObject();
 827
 828                 if ( $this->mContentObject ) {
 829                         // Give hooks a chance to customise the output
 830                         if ( ContentHandler::runLegacyHooks(
 831                                 'ShowRawCssJs',
 832                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 833                         ) {
 834                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 835                                 // but excluding metadata like categories and language links
 836                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 837                                 $outputPage->addParserOutputContent( $po );
 838                         }
 839                 }
 840         }
 841
 842         /**
 843          * Get the robot policy to be used for the current view
 844          * @param string $action The action= GET parameter
 845          * @param ParserOutput|null $pOutput
 846          * @return array The policy that should be set
 847          * @todo actions other than 'view'
 848          */
 849         public function getRobotPolicy( $action, $pOutput = null ) {
 850                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 851
 852                 $ns = $this->getTitle()->getNamespace();
 853
 854                 # Don't index user and user talk pages for blocked users (bug 11443)
 855                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 856                         $specificTarget = null;
 857                         $vagueTarget = null;
 858                         $titleText = $this->getTitle()->getText();
 859                         if ( IP::isValid( $titleText ) ) {
 860                                 $vagueTarget = $titleText;
 861                         } else {
 862                                 $specificTarget = $titleText;
 863                         }
 864                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 865                                 return array(
 866                                         'index' => 'noindex',
 867                                         'follow' => 'nofollow'
 868                                 );
 869                         }
 870                 }
 871
 872                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 873                         # Non-articles (special pages etc), and old revisions
 874                         return array(
 875                                 'index' => 'noindex',
 876                                 'follow' => 'nofollow'
 877                         );
 878                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 879                         # Discourage indexing of printable versions, but encourage following
 880                         return array(
 881                                 'index' => 'noindex',
 882                                 'follow' => 'follow'
 883                         );
 884                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 885                         # For ?curid=x urls, disallow indexing
 886                         return array(
 887                                 'index' => 'noindex',
 888                                 'follow' => 'follow'
 889                         );
 890                 }
 891
 892                 # Otherwise, construct the policy based on the various config variables.
 893                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 894
 895                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 896                         # Honour customised robot policies for this namespace
 897                         $policy = array_merge(
 898                                 $policy,
 899                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 900                         );
 901                 }
 902                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 903                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 904                         # a final sanity check that we have really got the parser output.
 905                         $policy = array_merge(
 906                                 $policy,
 907                                 array( 'index' => $pOutput->getIndexPolicy() )
 908                         );
 909                 }
 910
 911                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 912                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 913                         $policy = array_merge(
 914                                 $policy,
 915                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 916                         );
 917                 }
 918
 919                 return $policy;
 920         }
 921
 922         /**
 923          * Converts a String robot policy into an associative array, to allow
 924          * merging of several policies using array_merge().
 925          * @param array|string $policy Returns empty array on null/false/'', transparent
 926          *   to already-converted arrays, converts string.
 927          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 928          */
 929         public static function formatRobotPolicy( $policy ) {
 930                 if ( is_array( $policy ) ) {
 931                         return $policy;
 932                 } elseif ( !$policy ) {
 933                         return array();
 934                 }
 935
 936                 $policy = explode( ',', $policy );
 937                 $policy = array_map( 'trim', $policy );
 938
 939                 $arr = array();
 940                 foreach ( $policy as $var ) {
 941                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 942                                 $arr['index'] = $var;
 943                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 944                                 $arr['follow'] = $var;
 945                         }
 946                 }
 947
 948                 return $arr;
 949         }
 950
 951         /**
 952          * If this request is a redirect view, send "redirected from" subtitle to
 953          * the output. Returns true if the header was needed, false if this is not
 954          * a redirect view. Handles both local and remote redirects.
 955          *
 956          * @return bool
 957          */
 958         public function showRedirectedFromHeader() {
 959                 global $wgRedirectSources;
 960                 $outputPage = $this->getContext()->getOutput();
 961
 962                 $request = $this->getContext()->getRequest();
 963                 $rdfrom = $request->getVal( 'rdfrom' );
 964
 965                 // Construct a URL for the current page view, but with the target title
 966                 $query = $request->getValues();
 967                 unset( $query['rdfrom'] );
 968                 unset( $query['title'] );
 969                 if ( $this->getTitle()->isRedirect() ) {
 970                         // Prevent double redirects
 971                         $query['redirect'] = 'no';
 972                 }
 973                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 974
 975                 if ( isset( $this->mRedirectedFrom ) ) {
 976                         // This is an internally redirected page view.
 977                         // We'll need a backlink to the source page for navigation.
 978                         if ( Hooks::run( 'ArticleViewRedirect', array( &$this ) ) ) {
 979                                 $redir = Linker::linkKnown(
 980                                         $this->mRedirectedFrom,
 981                                         null,
 982                                         array(),
 983                                         array( 'redirect' => 'no' )
 984                                 );
 985
 986                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 987                                         wfMessage( 'redirectedfrom' )->rawParams( $redir )->parse()
 988                                 . "</span>" );
 989
 990                                 // Add the script to update the displayed URL and
 991                                 // set the fragment if one was specified in the redirect
 992                                 $outputPage->addJsConfigVars( array(
 993                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 994                                 ) );
 995                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 996
 997                                 // Add a <link rel="canonical"> tag
 998                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 999
1000                                 // Tell the output object that the user arrived at this article through a redirect
1001                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1002
1003                                 return true;
1004                         }
1005                 } elseif ( $rdfrom ) {
1006                         // This is an externally redirected view, from some other wiki.
1007                         // If it was reported from a trusted site, supply a backlink.
1008                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1009                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1010                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1011                                         wfMessage( 'redirectedfrom' )->rawParams( $redir )->parse()
1012                                 . "</span>" );
1013
1014                                 // Add the script to update the displayed URL
1015                                 $outputPage->addJsConfigVars( array(
1016                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1017                                 ) );
1018                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1019
1020                                 return true;
1021                         }
1022                 }
1023
1024                 return false;
1025         }
1026
1027         /**
1028          * Show a header specific to the namespace currently being viewed, like
1029          * [[MediaWiki:Talkpagetext]]. For Article::view().
1030          */
1031         public function showNamespaceHeader() {
1032                 if ( $this->getTitle()->isTalkPage() ) {
1033                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1034                                 $this->getContext()->getOutput()->wrapWikiMsg(
1035                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1036                                         array( 'talkpageheader' )
1037                                 );
1038                         }
1039                 }
1040         }
1041
1042         /**
1043          * Show the footer section of an ordinary page view
1044          */
1045         public function showViewFooter() {
1046                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1047                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1048                         && IP::isValid( $this->getTitle()->getText() )
1049                 ) {
1050                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1051                 }
1052
1053                 // Show a footer allowing the user to patrol the shown revision or page if possible
1054                 $patrolFooterShown = $this->showPatrolFooter();
1055
1056                 Hooks::run( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1057         }
1058
1059         /**
1060          * If patrol is possible, output a patrol UI box. This is called from the
1061          * footer section of ordinary page views. If patrol is not possible or not
1062          * desired, does nothing.
1063          * Side effect: When the patrol link is build, this method will call
1064          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1065          *
1066          * @return bool
1067          */
1068         public function showPatrolFooter() {
1069                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1070
1071                 $outputPage = $this->getContext()->getOutput();
1072                 $user = $this->getContext()->getUser();
1073                 $cache = wfGetMainCache();
1074                 $rc = false;
1075
1076                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1077                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1078                 ) {
1079                         // Patrolling is disabled or the user isn't allowed to
1080                         return false;
1081                 }
1082
1083
1084                 // New page patrol: Get the timestamp of the oldest revison which
1085                 // the revision table holds for the given page. Then we look
1086                 // whether it's within the RC lifespan and if it is, we try
1087                 // to get the recentchanges row belonging to that entry
1088                 // (with rc_new = 1).
1089
1090                 // Check for cached results
1091                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1092                         return false;
1093                 }
1094
1095                 if ( $this->mRevision
1096                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1097                 ) {
1098                         // The current revision is already older than what could be in the RC table
1099                         // 6h tolerance because the RC might not be cleaned out regularly
1100                         return false;
1101                 }
1102
1103                 $dbr = wfGetDB( DB_SLAVE );
1104                 $oldestRevisionTimestamp = $dbr->selectField(
1105                         'revision',
1106                         'MIN( rev_timestamp )',
1107                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1108                         __METHOD__
1109                 );
1110
1111                 if ( $oldestRevisionTimestamp
1112                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1113                 ) {
1114                         // 6h tolerance because the RC might not be cleaned out regularly
1115                         $rc = RecentChange::newFromConds(
1116                                 array(
1117                                         'rc_new' => 1,
1118                                         'rc_timestamp' => $oldestRevisionTimestamp,
1119                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1120                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1121                                         'rc_patrolled' => 0
1122                                 ),
1123                                 __METHOD__,
1124                                 array( 'USE INDEX' => 'new_name_timestamp' )
1125                         );
1126                 }
1127
1128                 if ( !$rc ) {
1129                         // No RC entry around
1130
1131                         // Cache the information we gathered above in case we can't patrol
1132                         // Don't cache in case we can patrol as this could change
1133                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1134
1135                         return false;
1136                 }
1137
1138                 if ( $rc->getPerformer()->getName() == $user->getName() ) {
1139                         // Don't show a patrol link for own creations. If the user could
1140                         // patrol them, they already would be patrolled
1141                         return false;
1142                 }
1143
1144                 $rcid = $rc->getAttribute( 'rc_id' );
1145
1146                 $token = $user->getEditToken( $rcid );
1147
1148                 $outputPage->preventClickjacking();
1149                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1150                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1151                 }
1152
1153                 $link = Linker::linkKnown(
1154                         $this->getTitle(),
1155                         wfMessage( 'markaspatrolledtext' )->escaped(),
1156                         array(),
1157                         array(
1158                                 'action' => 'markpatrolled',
1159                                 'rcid' => $rcid,
1160                                 'token' => $token,
1161                         )
1162                 );
1163
1164                 $outputPage->addHTML(
1165                         "<div class='patrollink'>" .
1166                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1167                         '</div>'
1168                 );
1169
1170                 return true;
1171         }
1172
1173         /**
1174          * Show the error text for a missing article. For articles in the MediaWiki
1175          * namespace, show the default message text. To be called from Article::view().
1176          */
1177         public function showMissingArticle() {
1178                 global $wgSend404Code;
1179
1180                 $outputPage = $this->getContext()->getOutput();
1181                 // Whether the page is a root user page of an existing user (but not a subpage)
1182                 $validUserPage = false;
1183
1184                 $title = $this->getTitle();
1185
1186                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1187                 if ( $title->getNamespace() == NS_USER
1188                         || $title->getNamespace() == NS_USER_TALK
1189                 ) {
1190                         $parts = explode( '/', $title->getText() );
1191                         $rootPart = $parts[0];
1192                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1193                         $ip = User::isIP( $rootPart );
1194                         $block = Block::newFromTarget( $user, $user );
1195
1196                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1197                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1198                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1199                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1200                                 # Show log extract if the user is currently blocked
1201                                 LogEventsList::showLogExtract(
1202                                         $outputPage,
1203                                         'block',
1204                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1205                                         '',
1206                                         array(
1207                                                 'lim' => 1,
1208                                                 'showIfEmpty' => false,
1209                                                 'msgKey' => array(
1210                                                         'blocked-notice-logextract',
1211                                                         $user->getName() # Support GENDER in notice
1212                                                 )
1213                                         )
1214                                 );
1215                                 $validUserPage = !$title->isSubpage();
1216                         } else {
1217                                 $validUserPage = !$title->isSubpage();
1218                         }
1219                 }
1220
1221                 Hooks::run( 'ShowMissingArticle', array( $this ) );
1222
1223                 // Give extensions a chance to hide their (unrelated) log entries
1224                 $logTypes = array( 'delete', 'move' );
1225                 $conds = array( "log_action != 'revision'" );
1226                 Hooks::run( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1227
1228                 # Show delete and move logs
1229                 LogEventsList::showLogExtract( $outputPage, $logTypes, $title, '',
1230                         array( 'lim' => 10,
1231                                 'conds' => $conds,
1232                                 'showIfEmpty' => false,
1233                                 'msgKey' => array( 'moveddeleted-notice' ) )
1234                 );
1235
1236                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1237                         // If there's no backing content, send a 404 Not Found
1238                         // for better machine handling of broken links.
1239                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1240                 }
1241
1242                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1243                 $policy = $this->getRobotPolicy( 'view' );
1244                 $outputPage->setIndexPolicy( $policy['index'] );
1245                 $outputPage->setFollowPolicy( $policy['follow'] );
1246
1247                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', array( $this ) );
1248
1249                 if ( !$hookResult ) {
1250                         return;
1251                 }
1252
1253                 # Show error message
1254                 $oldid = $this->getOldID();
1255                 if ( $oldid ) {
1256                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1257                 } elseif ( $title->getNamespace() === NS_MEDIAWIKI ) {
1258                         // Use the default message text
1259                         $text = $title->getDefaultMessageText();
1260                 } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1261                         && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1262                 ) {
1263                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1264                         $text = wfMessage( $message )->plain();
1265                 } else {
1266                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1267                 }
1268                 $text = "<div class='noarticletext'>\n$text\n</div>";
1269
1270                 $outputPage->addWikiText( $text );
1271         }
1272
1273         /**
1274          * If the revision requested for view is deleted, check permissions.
1275          * Send either an error message or a warning header to the output.
1276          *
1277          * @return bool True if the view is allowed, false if not.
1278          */
1279         public function showDeletedRevisionHeader() {
1280                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1281                         // Not deleted
1282                         return true;
1283                 }
1284
1285                 $outputPage = $this->getContext()->getOutput();
1286                 $user = $this->getContext()->getUser();
1287                 // If the user is not allowed to see it...
1288                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1289                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1290                                 'rev-deleted-text-permission' );
1291
1292                         return false;
1293                 // If the user needs to confirm that they want to see it...
1294                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1295                         # Give explanation and add a link to view the revision...
1296                         $oldid = intval( $this->getOldID() );
1297                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1298                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1299                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1300                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1301                                 array( $msg, $link ) );
1302
1303                         return false;
1304                 // We are allowed to see...
1305                 } else {
1306                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1307                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1308                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1309
1310                         return true;
1311                 }
1312         }
1313
1314         /**
1315          * Generate the navigation links when browsing through an article revisions
1316          * It shows the information as:
1317          *   Revision as of \<date\>; view current revision
1318          *   \<- Previous version | Next Version -\>
1319          *
1320          * @param int $oldid Revision ID of this article revision
1321          */
1322         public function setOldSubtitle( $oldid = 0 ) {
1323                 if ( !Hooks::run( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1324                         return;
1325                 }
1326
1327                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1328
1329                 # Cascade unhide param in links for easy deletion browsing
1330                 $extraParams = array();
1331                 if ( $unhide ) {
1332                         $extraParams['unhide'] = 1;
1333                 }
1334
1335                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1336                         $revision = $this->mRevision;
1337                 } else {
1338                         $revision = Revision::newFromId( $oldid );
1339                 }
1340
1341                 $timestamp = $revision->getTimestamp();
1342
1343                 $current = ( $oldid == $this->mPage->getLatest() );
1344                 $language = $this->getContext()->getLanguage();
1345                 $user = $this->getContext()->getUser();
1346
1347                 $td = $language->userTimeAndDate( $timestamp, $user );
1348                 $tddate = $language->userDate( $timestamp, $user );
1349                 $tdtime = $language->userTime( $timestamp, $user );
1350
1351                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1352                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1353
1354                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1355                         ? 'revision-info-current'
1356                         : 'revision-info';
1357
1358                 $outputPage = $this->getContext()->getOutput();
1359                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" .
1360                         wfMessage( $infomsg, $td )
1361                                 ->rawParams( $userlinks )
1362                                 ->params( $revision->getID(), $tddate, $tdtime, $revision->getUserText() )
1363                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1364                                 ->parse() .
1365                         "</div>"
1366                 );
1367
1368                 $lnk = $current
1369                         ? wfMessage( 'currentrevisionlink' )->escaped()
1370                         : Linker::linkKnown(
1371                                 $this->getTitle(),
1372                                 wfMessage( 'currentrevisionlink' )->escaped(),
1373                                 array(),
1374                                 $extraParams
1375                         );
1376                 $curdiff = $current
1377                         ? wfMessage( 'diff' )->escaped()
1378                         : Linker::linkKnown(
1379                                 $this->getTitle(),
1380                                 wfMessage( 'diff' )->escaped(),
1381                                 array(),
1382                                 array(
1383                                         'diff' => 'cur',
1384                                         'oldid' => $oldid
1385                                 ) + $extraParams
1386                         );
1387                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1388                 $prevlink = $prev
1389                         ? Linker::linkKnown(
1390                                 $this->getTitle(),
1391                                 wfMessage( 'previousrevision' )->escaped(),
1392                                 array(),
1393                                 array(
1394                                         'direction' => 'prev',
1395                                         'oldid' => $oldid
1396                                 ) + $extraParams
1397                         )
1398                         : wfMessage( 'previousrevision' )->escaped();
1399                 $prevdiff = $prev
1400                         ? Linker::linkKnown(
1401                                 $this->getTitle(),
1402                                 wfMessage( 'diff' )->escaped(),
1403                                 array(),
1404                                 array(
1405                                         'diff' => 'prev',
1406                                         'oldid' => $oldid
1407                                 ) + $extraParams
1408                         )
1409                         : wfMessage( 'diff' )->escaped();
1410                 $nextlink = $current
1411                         ? wfMessage( 'nextrevision' )->escaped()
1412                         : Linker::linkKnown(
1413                                 $this->getTitle(),
1414                                 wfMessage( 'nextrevision' )->escaped(),
1415                                 array(),
1416                                 array(
1417                                         'direction' => 'next',
1418                                         'oldid' => $oldid
1419                                 ) + $extraParams
1420                         );
1421                 $nextdiff = $current
1422                         ? wfMessage( 'diff' )->escaped()
1423                         : Linker::linkKnown(
1424                                 $this->getTitle(),
1425                                 wfMessage( 'diff' )->escaped(),
1426                                 array(),
1427                                 array(
1428                                         'diff' => 'next',
1429                                         'oldid' => $oldid
1430                                 ) + $extraParams
1431                         );
1432
1433                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1434                 if ( $cdel !== '' ) {
1435                         $cdel .= ' ';
1436                 }
1437
1438                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1439                         wfMessage( 'revision-nav' )->rawParams(
1440                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1441                         )->escaped() . "</div>" );
1442         }
1443
1444         /**
1445          * Return the HTML for the top of a redirect page
1446          *
1447          * Chances are you should just be using the ParserOutput from
1448          * WikitextContent::getParserOutput instead of calling this for redirects.
1449          *
1450          * @param Title|array $target Destination(s) to redirect
1451          * @param bool $appendSubtitle [optional]
1452          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1453          * @return string Containing HTML with redirect link
1454          */
1455         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1456                 $lang = $this->getTitle()->getPageLanguage();
1457                 $out = $this->getContext()->getOutput();
1458                 if ( $appendSubtitle ) {
1459                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
1460                 }
1461                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1462                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1463         }
1464
1465         /**
1466          * Return the HTML for the top of a redirect page
1467          *
1468          * Chances are you should just be using the ParserOutput from
1469          * WikitextContent::getParserOutput instead of calling this for redirects.
1470          *
1471          * @since 1.23
1472          * @param Language $lang
1473          * @param Title|array $target Destination(s) to redirect
1474          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1475          * @return string Containing HTML with redirect link
1476          */
1477         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1478                 if ( !is_array( $target ) ) {
1479                         $target = array( $target );
1480                 }
1481
1482                 $html = '<ul class="redirectText">';
1483                 /** @var Title $title */
1484                 foreach ( $target as $title ) {
1485                         $html .= '<li>' . Linker::link(
1486                                 $title,
1487                                 htmlspecialchars( $title->getFullText() ),
1488                                 array(),
1489                                 // Automatically append redirect=no to each link, since most of them are
1490                                 // redirect pages themselves.
1491                                 array( 'redirect' => 'no' ),
1492                                 ( $forceKnown ? array( 'known', 'noclasses' ) : array() )
1493                         ) . '</li>';
1494                 }
1495
1496                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->text();
1497
1498                 return '<div class="redirectMsg">' .
1499                         '<p>' . $redirectToText . '</p>' .
1500                         $html .
1501                         '</div>';
1502         }
1503
1504         /**
1505          * Handle action=render
1506          */
1507         public function render() {
1508                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1509                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1510                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1511                 $this->view();
1512         }
1513
1514         /**
1515          * action=protect handler
1516          */
1517         public function protect() {
1518                 $form = new ProtectionForm( $this );
1519                 $form->execute();
1520         }
1521
1522         /**
1523          * action=unprotect handler (alias)
1524          */
1525         public function unprotect() {
1526                 $this->protect();
1527         }
1528
1529         /**
1530          * UI entry point for page deletion
1531          */
1532         public function delete() {
1533                 # This code desperately needs to be totally rewritten
1534
1535                 $title = $this->getTitle();
1536                 $context = $this->getContext();
1537                 $user = $context->getUser();
1538
1539                 # Check permissions
1540                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1541                 if ( count( $permissionErrors ) ) {
1542                         throw new PermissionsError( 'delete', $permissionErrors );
1543                 }
1544
1545                 # Read-only check...
1546                 if ( wfReadOnly() ) {
1547                         throw new ReadOnlyError;
1548                 }
1549
1550                 # Better double-check that it hasn't been deleted yet!
1551                 $this->mPage->loadPageData( 'fromdbmaster' );
1552                 if ( !$this->mPage->exists() ) {
1553                         $deleteLogPage = new LogPage( 'delete' );
1554                         $outputPage = $context->getOutput();
1555                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1556                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1557                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1558                                 );
1559                         $outputPage->addHTML(
1560                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1561                         );
1562                         LogEventsList::showLogExtract(
1563                                 $outputPage,
1564                                 'delete',
1565                                 $title
1566                         );
1567
1568                         return;
1569                 }
1570
1571                 $request = $context->getRequest();
1572                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1573                 $deleteReason = $request->getText( 'wpReason' );
1574
1575                 if ( $deleteReasonList == 'other' ) {
1576                         $reason = $deleteReason;
1577                 } elseif ( $deleteReason != '' ) {
1578                         // Entry from drop down menu + additional comment
1579                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1580                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1581                 } else {
1582                         $reason = $deleteReasonList;
1583                 }
1584
1585                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1586                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1587                 ) {
1588                         # Flag to hide all contents of the archived revisions
1589                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1590
1591                         $this->doDelete( $reason, $suppress );
1592
1593                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1594
1595                         return;
1596                 }
1597
1598                 // Generate deletion reason
1599                 $hasHistory = false;
1600                 if ( !$reason ) {
1601                         try {
1602                                 $reason = $this->generateReason( $hasHistory );
1603                         } catch ( MWException $e ) {
1604                                 # if a page is horribly broken, we still want to be able to
1605                                 # delete it. So be lenient about errors here.
1606                                 wfDebug( "Error while building auto delete summary: $e" );
1607                                 $reason = '';
1608                         }
1609                 }
1610
1611                 // If the page has a history, insert a warning
1612                 if ( $hasHistory ) {
1613                         $title = $this->getTitle();
1614
1615                         // The following can use the real revision count as this is only being shown for users
1616                         // that can delete this page.
1617                         // This, as a side-effect, also makes sure that the following query isn't being run for
1618                         // pages with a larger history, unless the user has the 'bigdelete' right
1619                         // (and is about to delete this page).
1620                         $dbr = wfGetDB( DB_SLAVE );
1621                         $revisions = $edits = (int)$dbr->selectField(
1622                                 'revision',
1623                                 'COUNT(rev_page)',
1624                                 array( 'rev_page' => $title->getArticleID() ),
1625                                 __METHOD__
1626                         );
1627
1628                         // @todo FIXME: i18n issue/patchwork message
1629                         $context->getOutput()->addHTML(
1630                                 '<strong class="mw-delete-warning-revisions">' .
1631                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1632                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1633                                         $context->msg( 'history' )->escaped(),
1634                                         array( 'rel' => 'archives' ),
1635                                         array( 'action' => 'history' ) ) .
1636                                 '</strong>'
1637                         );
1638
1639                         if ( $title->isBigDeletion() ) {
1640                                 global $wgDeleteRevisionsLimit;
1641                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1642                                         array(
1643                                                 'delete-warning-toobig',
1644                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1645                                         )
1646                                 );
1647                         }
1648                 }
1649
1650                 $this->confirmDelete( $reason );
1651         }
1652
1653         /**
1654          * Output deletion confirmation dialog
1655          * @todo FIXME: Move to another file?
1656          * @param string $reason Prefilled reason
1657          */
1658         public function confirmDelete( $reason ) {
1659                 wfDebug( "Article::confirmDelete\n" );
1660
1661                 $title = $this->getTitle();
1662                 $ctx = $this->getContext();
1663                 $outputPage = $ctx->getOutput();
1664                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1665                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1666                 $outputPage->addBacklinkSubtitle( $title );
1667                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1668                 $backlinkCache = $title->getBacklinkCache();
1669                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1670                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1671                                 'deleting-backlinks-warning' );
1672                 }
1673                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1674
1675                 Hooks::run( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1676
1677                 $user = $this->getContext()->getUser();
1678
1679                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1680                         $suppress = Html::openElement( 'div', array( 'id' => 'wpDeleteSuppressRow' ) ) .
1681                                 "<strong>" .
1682                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1683                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1684                                         "</strong>" .
1685                                 Html::closeElement( 'div' );
1686                 } else {
1687                         $suppress = '';
1688                 }
1689                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1690
1691                 $form = Html::openElement( 'form', array( 'method' => 'post',
1692                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1693                         Html::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1694                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1695                         Html::openElement( 'div', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1696                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonListRow' ) ) .
1697                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1698                         '&nbsp;' .
1699                         Xml::listDropDown(
1700                                 'wpDeleteReasonList',
1701                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1702                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1703                                 '',
1704                                 'wpReasonDropDown',
1705                                 1
1706                         ) .
1707                         Html::closeElement( 'div' ) .
1708                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonRow' ) ) .
1709                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1710                         '&nbsp;' .
1711                         Html::input( 'wpReason', $reason, 'text', array(
1712                                 'size' => '60',
1713                                 'maxlength' => '255',
1714                                 'tabindex' => '2',
1715                                 'id' => 'wpReason',
1716                                 'class' => 'mw-ui-input-inline',
1717                                 'autofocus'
1718                         ) ) .
1719                         Html::closeElement( 'div' );
1720
1721                 # Disallow watching if user is not logged in
1722                 if ( $user->isLoggedIn() ) {
1723                         $form .=
1724                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1725                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) );
1726                 }
1727
1728                 $form .=
1729                                 Html::openElement( 'div' ) .
1730                                 $suppress .
1731                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1732                                                 array(
1733                                                         'name' => 'wpConfirmB',
1734                                                         'id' => 'wpConfirmB',
1735                                                         'tabindex' => '5',
1736                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1737                                                 )
1738                                         ) .
1739                                 Html::closeElement( 'div' ) .
1740                         Html::closeElement( 'div' ) .
1741                         Xml::closeElement( 'fieldset' ) .
1742                         Html::hidden(
1743                                 'wpEditToken',
1744                                 $user->getEditToken( array( 'delete', $title->getPrefixedText() ) )
1745                         ) .
1746                         Xml::closeElement( 'form' );
1747
1748                         if ( $user->isAllowed( 'editinterface' ) ) {
1749                                 $dropdownTitle = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1750                                 $link = Linker::link(
1751                                         $dropdownTitle,
1752                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1753                                         array(),
1754                                         array( 'action' => 'edit' )
1755                                 );
1756                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1757                         }
1758
1759                 $outputPage->addHTML( $form );
1760
1761                 $deleteLogPage = new LogPage( 'delete' );
1762                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1763                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1764         }
1765
1766         /**
1767          * Perform a deletion and output success or failure messages
1768          * @param string $reason
1769          * @param bool $suppress
1770          */
1771         public function doDelete( $reason, $suppress = false ) {
1772                 $error = '';
1773                 $outputPage = $this->getContext()->getOutput();
1774                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1775
1776                 if ( $status->isGood() ) {
1777                         $deleted = $this->getTitle()->getPrefixedText();
1778
1779                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1780                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1781
1782                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1783
1784                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1785
1786                         Hooks::run( 'ArticleDeleteAfterSuccess', array( $this->getTitle(), $outputPage ) );
1787
1788                         $outputPage->returnToMain( false );
1789                 } else {
1790                         $outputPage->setPageTitle(
1791                                 wfMessage( 'cannotdelete-title',
1792                                         $this->getTitle()->getPrefixedText() )
1793                         );
1794
1795                         if ( $error == '' ) {
1796                                 $outputPage->addWikiText(
1797                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1798                                 );
1799                                 $deleteLogPage = new LogPage( 'delete' );
1800                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1801
1802                                 LogEventsList::showLogExtract(
1803                                         $outputPage,
1804                                         'delete',
1805                                         $this->getTitle()
1806                                 );
1807                         } else {
1808                                 $outputPage->addHTML( $error );
1809                         }
1810                 }
1811         }
1812
1813         /* Caching functions */
1814
1815         /**
1816          * checkLastModified returns true if it has taken care of all
1817          * output to the client that is necessary for this request.
1818          * (that is, it has sent a cached version of the page)
1819          *
1820          * @return bool True if cached version send, false otherwise
1821          */
1822         protected function tryFileCache() {
1823                 static $called = false;
1824
1825                 if ( $called ) {
1826                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1827                         return false;
1828                 }
1829
1830                 $called = true;
1831                 if ( $this->isFileCacheable() ) {
1832                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1833                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1834                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1835                                 $cache->loadFromFileCache( $this->getContext() );
1836                                 return true;
1837                         } else {
1838                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1839                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1840                         }
1841                 } else {
1842                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1843                 }
1844
1845                 return false;
1846         }
1847
1848         /**
1849          * Check if the page can be cached
1850          * @return bool
1851          */
1852         public function isFileCacheable() {
1853                 $cacheable = false;
1854
1855                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1856                         $cacheable = $this->mPage->getID()
1857                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1858                         // Extension may have reason to disable file caching on some pages.
1859                         if ( $cacheable ) {
1860                                 $cacheable = Hooks::run( 'IsFileCacheable', array( &$this ) );
1861                         }
1862                 }
1863
1864                 return $cacheable;
1865         }
1866
1867         /**#@-*/
1868
1869         /**
1870          * Lightweight method to get the parser output for a page, checking the parser cache
1871          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1872          * consider, so it's not appropriate to use there.
1873          *
1874          * @since 1.16 (r52326) for LiquidThreads
1875          *
1876          * @param int|null $oldid Revision ID or null
1877          * @param User $user The relevant user
1878          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1879          */
1880         public function getParserOutput( $oldid = null, User $user = null ) {
1881                 //XXX: bypasses mParserOptions and thus setParserOptions()
1882
1883                 if ( $user === null ) {
1884                         $parserOptions = $this->getParserOptions();
1885                 } else {
1886                         $parserOptions = $this->mPage->makeParserOptions( $user );
1887                 }
1888
1889                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1890         }
1891
1892         /**
1893          * Override the ParserOptions used to render the primary article wikitext.
1894          *
1895          * @param ParserOptions $options
1896          * @throws MWException If the parser options where already initialized.
1897          */
1898         public function setParserOptions( ParserOptions $options ) {
1899                 if ( $this->mParserOptions ) {
1900                         throw new MWException( "can't change parser options after they have already been set" );
1901                 }
1902
1903                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1904                 $this->mParserOptions = clone $options;
1905         }
1906
1907         /**
1908          * Get parser options suitable for rendering the primary article wikitext
1909          * @return ParserOptions
1910          */
1911         public function getParserOptions() {
1912                 if ( !$this->mParserOptions ) {
1913                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1914                 }
1915                 // Clone to allow modifications of the return value without affecting cache
1916                 return clone $this->mParserOptions;
1917         }
1918
1919         /**
1920          * Sets the context this Article is executed in
1921          *
1922          * @param IContextSource $context
1923          * @since 1.18
1924          */
1925         public function setContext( $context ) {
1926                 $this->mContext = $context;
1927         }
1928
1929         /**
1930          * Gets the context this Article is executed in
1931          *
1932          * @return IContextSource
1933          * @since 1.18
1934          */
1935         public function getContext() {
1936                 if ( $this->mContext instanceof IContextSource ) {
1937                         return $this->mContext;
1938                 } else {
1939                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1940                                 "Return RequestContext::getMain(); for sanity\n" );
1941                         return RequestContext::getMain();
1942                 }
1943         }
1944
1945         /**
1946          * Use PHP's magic __get handler to handle accessing of
1947          * raw WikiPage fields for backwards compatibility.
1948          *
1949          * @param string $fname Field name
1950          * @return mixed
1951          */
1952         public function __get( $fname ) {
1953                 if ( property_exists( $this->mPage, $fname ) ) {
1954                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1955                         return $this->mPage->$fname;
1956                 }
1957                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1958         }
1959
1960         /**
1961          * Use PHP's magic __set handler to handle setting of
1962          * raw WikiPage fields for backwards compatibility.
1963          *
1964          * @param string $fname Field name
1965          * @param mixed $fvalue New value
1966          */
1967         public function __set( $fname, $fvalue ) {
1968                 if ( property_exists( $this->mPage, $fname ) ) {
1969                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1970                         $this->mPage->$fname = $fvalue;
1971                 // Note: extensions may want to toss on new fields
1972                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1973                         $this->mPage->$fname = $fvalue;
1974                 } else {
1975                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1976                 }
1977         }
1978
1979         /**
1980          * Use PHP's magic __call handler to transform instance calls to
1981          * WikiPage functions for backwards compatibility.
1982          *
1983          * @param string $fname Name of called method
1984          * @param array $args Arguments to the method
1985          * @return mixed
1986          */
1987         public function __call( $fname, $args ) {
1988                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1989                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1990                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1991                 }
1992                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1993         }
1994
1995         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1996
1997         /**
1998          * @param array $limit
1999          * @param array $expiry
2000          * @param bool $cascade
2001          * @param string $reason
2002          * @param User $user
2003          * @return Status
2004          */
2005         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2006                 $reason, User $user
2007         ) {
2008                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2009         }
2010
2011         /**
2012          * @param array $limit
2013          * @param string $reason
2014          * @param int $cascade
2015          * @param array $expiry
2016          * @return bool
2017          */
2018         public function updateRestrictions( $limit = array(), $reason = '',
2019                 &$cascade = 0, $expiry = array()
2020         ) {
2021                 return $this->mPage->doUpdateRestrictions(
2022                         $limit,
2023                         $expiry,
2024                         $cascade,
2025                         $reason,
2026                         $this->getContext()->getUser()
2027                 );
2028         }
2029
2030         /**
2031          * @param string $reason
2032          * @param bool $suppress
2033          * @param int $id
2034          * @param bool $commit
2035          * @param string $error
2036          * @return bool
2037          */
2038         public function doDeleteArticle( $reason, $suppress = false, $id = 0,
2039                 $commit = true, &$error = ''
2040         ) {
2041                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2042         }
2043
2044         /**
2045          * @param string $fromP
2046          * @param string $summary
2047          * @param string $token
2048          * @param bool $bot
2049          * @param array $resultDetails
2050          * @param User|null $user
2051          * @return array
2052          */
2053         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2054                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2055                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2056         }
2057
2058         /**
2059          * @param string $fromP
2060          * @param string $summary
2061          * @param bool $bot
2062          * @param array $resultDetails
2063          * @param User|null $guser
2064          * @return array
2065          */
2066         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2067                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2068                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2069         }
2070
2071         /**
2072          * @param bool $hasHistory
2073          * @return mixed
2074          */
2075         public function generateReason( &$hasHistory ) {
2076                 $title = $this->mPage->getTitle();
2077                 $handler = ContentHandler::getForTitle( $title );
2078                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2079         }
2080
2081         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2082
2083         /**
2084          * @return array
2085          *
2086          * @deprecated since 1.24, use WikiPage::selectFields() instead
2087          */
2088         public static function selectFields() {
2089                 wfDeprecated( __METHOD__, '1.24' );
2090                 return WikiPage::selectFields();
2091         }
2092
2093         /**
2094          * @param Title $title
2095          *
2096          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2097          */
2098         public static function onArticleCreate( $title ) {
2099                 wfDeprecated( __METHOD__, '1.24' );
2100                 WikiPage::onArticleCreate( $title );
2101         }
2102
2103         /**
2104          * @param Title $title
2105          *
2106          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2107          */
2108         public static function onArticleDelete( $title ) {
2109                 wfDeprecated( __METHOD__, '1.24' );
2110                 WikiPage::onArticleDelete( $title );
2111         }
2112
2113         /**
2114          * @param Title $title
2115          *
2116          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2117          */
2118         public static function onArticleEdit( $title ) {
2119                 wfDeprecated( __METHOD__, '1.24' );
2120                 WikiPage::onArticleEdit( $title );
2121         }
2122
2123         /**
2124          * @param string $oldtext
2125          * @param string $newtext
2126          * @param int $flags
2127          * @return string
2128          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2129          */
2130         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2131                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2132         }
2133         // ******
2134 }