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