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 class Article implements Page {
  35         /** @var IContextSource The context this Article is executed in */
  36         protected $mContext;
  37
  38         /** @var WikiPage The WikiPage object of this instance */
  39         protected $mPage;
  40
  41         /** @var ParserOptions ParserOptions object for $wgUser articles */
  42         public $mParserOptions;
  43
  44         /**
  45          * @var string Text of the revision we are working on
  46          * @todo BC cruft
  47          */
  48         public $mContent;
  49
  50         /**
  51          * @var Content Content of the revision we are working on
  52          * @since 1.21
  53          */
  54         public $mContentObject;
  55
  56         /** @var bool Is the content ($mContent) already loaded? */
  57         public $mContentLoaded = false;
  58
  59         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  60         public $mOldId;
  61
  62         /** @var Title Title from which we were redirected here */
  63         public $mRedirectedFrom = null;
  64
  65         /** @var string|bool URL to redirect to or false if none */
  66         public $mRedirectUrl = false;
  67
  68         /** @var int Revision ID of revision we are working on */
  69         public $mRevIdFetched = 0;
  70
  71         /** @var Revision Revision we are working on */
  72         public $mRevision = null;
  73
  74         /** @var ParserOutput */
  75         public $mParserOutput;
  76
  77         /**
  78          * Constructor and clear the article
  79          * @param Title $title Reference to a Title object.
  80          * @param int $oldId Revision ID, null to fetch from request, zero for current
  81          */
  82         public function __construct( Title $title, $oldId = null ) {
  83                 $this->mOldId = $oldId;
  84                 $this->mPage = $this->newPage( $title );
  85         }
  86
  87         /**
  88          * @param Title $title
  89          * @return WikiPage
  90          */
  91         protected function newPage( Title $title ) {
  92                 return new WikiPage( $title );
  93         }
  94
  95         /**
  96          * Constructor from a page id
  97          * @param int $id Article ID to load
  98          * @return Article|null
  99          */
 100         public static function newFromID( $id ) {
 101                 $t = Title::newFromID( $id );
 102                 # @todo FIXME: Doesn't inherit right
 103                 return $t == null ? null : new self( $t );
 104                 # return $t == null ? null : new static( $t ); // PHP 5.3
 105         }
 106
 107         /**
 108          * Create an Article object of the appropriate class for the given page.
 109          *
 110          * @param Title $title
 111          * @param IContextSource $context
 112          * @return Article
 113          */
 114         public static function newFromTitle( $title, IContextSource $context ) {
 115                 if ( NS_MEDIA == $title->getNamespace() ) {
 116                         // FIXME: where should this go?
 117                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 118                 }
 119
 120                 $page = null;
 121                 Hooks::run( 'ArticleFromTitle', array( &$title, &$page, $context ) );
 122                 if ( !$page ) {
 123                         switch ( $title->getNamespace() ) {
 124                                 case NS_FILE:
 125                                         $page = new ImagePage( $title );
 126                                         break;
 127                                 case NS_CATEGORY:
 128                                         $page = new CategoryPage( $title );
 129                                         break;
 130                                 default:
 131                                         $page = new Article( $title );
 132                         }
 133                 }
 134                 $page->setContext( $context );
 135
 136                 return $page;
 137         }
 138
 139         /**
 140          * Create an Article object of the appropriate class for the given page.
 141          *
 142          * @param WikiPage $page
 143          * @param IContextSource $context
 144          * @return Article
 145          */
 146         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 147                 $article = self::newFromTitle( $page->getTitle(), $context );
 148                 $article->mPage = $page; // override to keep process cached vars
 149                 return $article;
 150         }
 151
 152         /**
 153          * Tell the page view functions that this view was redirected
 154          * from another page on the wiki.
 155          * @param Title $from
 156          */
 157         public function setRedirectedFrom( Title $from ) {
 158                 $this->mRedirectedFrom = $from;
 159         }
 160
 161         /**
 162          * Get the title object of the article
 163          *
 164          * @return Title Title object of this page
 165          */
 166         public function getTitle() {
 167                 return $this->mPage->getTitle();
 168         }
 169
 170         /**
 171          * Get the WikiPage object of this instance
 172          *
 173          * @since 1.19
 174          * @return WikiPage
 175          */
 176         public function getPage() {
 177                 return $this->mPage;
 178         }
 179
 180         /**
 181          * Clear the object
 182          */
 183         public function clear() {
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRevIdFetched = 0;
 188                 $this->mRedirectUrl = false;
 189
 190                 $this->mPage->clear();
 191         }
 192
 193         /**
 194          * Note that getContent does not follow redirects anymore.
 195          * If you need to fetch redirectable content easily, try
 196          * the shortcut in WikiPage::getRedirectTarget()
 197          *
 198          * This function has side effects! Do not use this function if you
 199          * only want the real revision text if any.
 200          *
 201          * @deprecated since 1.21; use WikiPage::getContent() instead
 202          *
 203          * @return string Return the text of this revision
 204          */
 205         public function getContent() {
 206                 ContentHandler::deprecated( __METHOD__, '1.21' );
 207                 $content = $this->getContentObject();
 208                 return ContentHandler::getContentText( $content );
 209         }
 210
 211         /**
 212          * Returns a Content object representing the pages effective display content,
 213          * not necessarily the revision's content!
 214          *
 215          * Note that getContent does not follow redirects anymore.
 216          * If you need to fetch redirectable content easily, try
 217          * the shortcut in WikiPage::getRedirectTarget()
 218          *
 219          * This function has side effects! Do not use this function if you
 220          * only want the real revision text if any.
 221          *
 222          * @return Content Return the content of this revision
 223          *
 224          * @since 1.21
 225          */
 226         protected function getContentObject() {
 227
 228                 if ( $this->mPage->getID() === 0 ) {
 229                         # If this is a MediaWiki:x message, then load the messages
 230                         # and return the message value for x.
 231                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 232                                 $text = $this->getTitle()->getDefaultMessageText();
 233                                 if ( $text === false ) {
 234                                         $text = '';
 235                                 }
 236
 237                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 238                         } else {
 239                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 240                                 $content = new MessageContent( $message, null, 'parsemag' );
 241                         }
 242                 } else {
 243                         $this->fetchContentObject();
 244                         $content = $this->mContentObject;
 245                 }
 246
 247                 return $content;
 248         }
 249
 250         /**
 251          * @return int The oldid of the article that is to be shown, 0 for the current revision
 252          */
 253         public function getOldID() {
 254                 if ( is_null( $this->mOldId ) ) {
 255                         $this->mOldId = $this->getOldIDFromRequest();
 256                 }
 257
 258                 return $this->mOldId;
 259         }
 260
 261         /**
 262          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 263          *
 264          * @return int The old id for the request
 265          */
 266         public function getOldIDFromRequest() {
 267                 $this->mRedirectUrl = false;
 268
 269                 $request = $this->getContext()->getRequest();
 270                 $oldid = $request->getIntOrNull( 'oldid' );
 271
 272                 if ( $oldid === null ) {
 273                         return 0;
 274                 }
 275
 276                 if ( $oldid !== 0 ) {
 277                         # Load the given revision and check whether the page is another one.
 278                         # In that case, update this instance to reflect the change.
 279                         if ( $oldid === $this->mPage->getLatest() ) {
 280                                 $this->mRevision = $this->mPage->getRevision();
 281                         } else {
 282                                 $this->mRevision = Revision::newFromId( $oldid );
 283                                 if ( $this->mRevision !== null ) {
 284                                         // Revision title doesn't match the page title given?
 285                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 286                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 287                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 288                                         }
 289                                 }
 290                         }
 291                 }
 292
 293                 if ( $request->getVal( 'direction' ) == 'next' ) {
 294                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 295                         if ( $nextid ) {
 296                                 $oldid = $nextid;
 297                                 $this->mRevision = null;
 298                         } else {
 299                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 300                         }
 301                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 302                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 303                         if ( $previd ) {
 304                                 $oldid = $previd;
 305                                 $this->mRevision = null;
 306                         }
 307                 }
 308
 309                 return $oldid;
 310         }
 311
 312         /**
 313          * Get text of an article from database
 314          * Does *NOT* follow redirects.
 315          *
 316          * @protected
 317          * @note This is really internal functionality that should really NOT be
 318          * used by other functions. For accessing article content, use the WikiPage
 319          * class, especially WikiBase::getContent(). However, a lot of legacy code
 320          * uses this method to retrieve page text from the database, so the function
 321          * has to remain public for now.
 322          *
 323          * @return string|bool String containing article contents, or false if null
 324          * @deprecated since 1.21, use WikiPage::getContent() instead
 325          */
 326         function fetchContent() {
 327                 // BC cruft!
 328
 329                 ContentHandler::deprecated( __METHOD__, '1.21' );
 330
 331                 if ( $this->mContentLoaded && $this->mContent ) {
 332                         return $this->mContent;
 333                 }
 334
 335                 $content = $this->fetchContentObject();
 336
 337                 if ( !$content ) {
 338                         return false;
 339                 }
 340
 341                 // @todo Get rid of mContent everywhere!
 342                 $this->mContent = ContentHandler::getContentText( $content );
 343                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 344
 345                 return $this->mContent;
 346         }
 347
 348         /**
 349          * Get text content object
 350          * Does *NOT* follow redirects.
 351          * @todo When is this null?
 352          *
 353          * @note Code that wants to retrieve page content from the database should
 354          * use WikiPage::getContent().
 355          *
 356          * @return Content|null|bool
 357          *
 358          * @since 1.21
 359          */
 360         protected function fetchContentObject() {
 361                 if ( $this->mContentLoaded ) {
 362                         return $this->mContentObject;
 363                 }
 364
 365                 $this->mContentLoaded = true;
 366                 $this->mContent = null;
 367
 368                 $oldid = $this->getOldID();
 369
 370                 # Pre-fill content with error message so that if something
 371                 # fails we'll have something telling us what we intended.
 372                 // XXX: this isn't page content but a UI message. horrible.
 373                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ) );
 374
 375                 if ( $oldid ) {
 376                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 377                         if ( !$this->mRevision ) {
 378                                 $this->mRevision = Revision::newFromId( $oldid );
 379                                 if ( !$this->mRevision ) {
 380                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 381                                         return false;
 382                                 }
 383                         }
 384                 } else {
 385                         $oldid = $this->mPage->getLatest();
 386                         if ( !$oldid ) {
 387                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 388                                         $this->getTitle()->getPrefixedText() . "\n" );
 389                                 return false;
 390                         }
 391
 392                         # Update error message with correct oldid
 393                         $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ) );
 394
 395                         $this->mRevision = $this->mPage->getRevision();
 396
 397                         if ( !$this->mRevision ) {
 398                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id $oldid\n" );
 399                                 return false;
 400                         }
 401                 }
 402
 403                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 404                 // We should instead work with the Revision object when we need it...
 405                 // Loads if user is allowed
 406                 $content = $this->mRevision->getContent(
 407                         Revision::FOR_THIS_USER,
 408                         $this->getContext()->getUser()
 409                 );
 410
 411                 if ( !$content ) {
 412                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 413                                 $this->mRevision->getId() . "\n" );
 414                         return false;
 415                 }
 416
 417                 $this->mContentObject = $content;
 418                 $this->mRevIdFetched = $this->mRevision->getId();
 419
 420                 Hooks::run( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 421
 422                 return $this->mContentObject;
 423         }
 424
 425         /**
 426          * Returns true if the currently-referenced revision is the current edit
 427          * to this page (and it exists).
 428          * @return bool
 429          */
 430         public function isCurrent() {
 431                 # If no oldid, this is the current version.
 432                 if ( $this->getOldID() == 0 ) {
 433                         return true;
 434                 }
 435
 436                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 437         }
 438
 439         /**
 440          * Get the fetched Revision object depending on request parameters or null
 441          * on failure.
 442          *
 443          * @since 1.19
 444          * @return Revision|null
 445          */
 446         public function getRevisionFetched() {
 447                 $this->fetchContentObject();
 448
 449                 return $this->mRevision;
 450         }
 451
 452         /**
 453          * Use this to fetch the rev ID used on page views
 454          *
 455          * @return int Revision ID of last article revision
 456          */
 457         public function getRevIdFetched() {
 458                 if ( $this->mRevIdFetched ) {
 459                         return $this->mRevIdFetched;
 460                 } else {
 461                         return $this->mPage->getLatest();
 462                 }
 463         }
 464
 465         /**
 466          * This is the default action of the index.php entry point: just view the
 467          * page of the given title.
 468          */
 469         public function view() {
 470                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar, $wgMaxRedirects;
 471
 472                 # Get variables from query string
 473                 # As side effect this will load the revision and update the title
 474                 # in a revision ID is passed in the request, so this should remain
 475                 # the first call of this method even if $oldid is used way below.
 476                 $oldid = $this->getOldID();
 477
 478                 $user = $this->getContext()->getUser();
 479                 # Another whitelist check in case getOldID() is altering the title
 480                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 481                 if ( count( $permErrors ) ) {
 482                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 483                         throw new PermissionsError( 'read', $permErrors );
 484                 }
 485
 486                 $outputPage = $this->getContext()->getOutput();
 487                 # getOldID() may as well want us to redirect somewhere else
 488                 if ( $this->mRedirectUrl ) {
 489                         $outputPage->redirect( $this->mRedirectUrl );
 490                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 491
 492                         return;
 493                 }
 494
 495                 # If we got diff in the query, we want to see a diff page instead of the article.
 496                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 497                         wfDebug( __METHOD__ . ": showing diff page\n" );
 498                         $this->showDiffPage();
 499
 500                         return;
 501                 }
 502
 503                 # Set page title (may be overridden by DISPLAYTITLE)
 504                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 505
 506                 $outputPage->setArticleFlag( true );
 507                 # Allow frames by default
 508                 $outputPage->allowClickjacking();
 509
 510                 $parserCache = ParserCache::singleton();
 511
 512                 $parserOptions = $this->getParserOptions();
 513                 # Render printable version, use printable version cache
 514                 if ( $outputPage->isPrintable() ) {
 515                         $parserOptions->setIsPrintable( true );
 516                         $parserOptions->setEditSection( false );
 517                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 518                         $parserOptions->setEditSection( false );
 519                 }
 520
 521                 # Try client and file cache
 522                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 523                         if ( $wgUseETag ) {
 524                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 525                         }
 526
 527                         # Use the greatest of the page's timestamp or the timestamp of any
 528                         # redirect in the chain (bug 67849)
 529                         $timestamp = $this->mPage->getTouched();
 530                         if ( isset( $this->mRedirectedFrom ) ) {
 531                                 $timestamp = max( $timestamp, $this->mRedirectedFrom->getTouched() );
 532
 533                                 # If there can be more than one redirect in the chain, we have
 534                                 # to go through the whole chain too in case an intermediate
 535                                 # redirect was changed.
 536                                 if ( $wgMaxRedirects > 1 ) {
 537                                         $titles = Revision::newFromTitle( $this->mRedirectedFrom )
 538                                                 ->getContent( Revision::FOR_THIS_USER, $user )
 539                                                 ->getRedirectChain();
 540                                         $thisTitle = $this->getTitle();
 541                                         foreach ( $titles as $title ) {
 542                                                 if ( Title::compare( $title, $thisTitle ) === 0 ) {
 543                                                         break;
 544                                                 }
 545                                                 $timestamp = max( $timestamp, $title->getTouched() );
 546                                         }
 547                                 }
 548                         }
 549
 550                         # Is it client cached?
 551                         if ( $outputPage->checkLastModified( $timestamp ) ) {
 552                                 wfDebug( __METHOD__ . ": done 304\n" );
 553
 554                                 return;
 555                         # Try file cache
 556                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 557                                 wfDebug( __METHOD__ . ": done file cache\n" );
 558                                 # tell wgOut that output is taken care of
 559                                 $outputPage->disable();
 560                                 $this->mPage->doViewUpdates( $user, $oldid );
 561
 562                                 return;
 563                         }
 564                 }
 565
 566                 # Should the parser cache be used?
 567                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 568                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 569                 if ( $user->getStubThreshold() ) {
 570                         $this->getContext()->getStats()->increment( 'pcache_miss_stub' );
 571                 }
 572
 573                 $this->showRedirectedFromHeader();
 574                 $this->showNamespaceHeader();
 575
 576                 # Iterate through the possible ways of constructing the output text.
 577                 # Keep going until $outputDone is set, or we run out of things to do.
 578                 $pass = 0;
 579                 $outputDone = false;
 580                 $this->mParserOutput = false;
 581
 582                 while ( !$outputDone && ++$pass ) {
 583                         switch ( $pass ) {
 584                                 case 1:
 585                                         Hooks::run( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 586                                         break;
 587                                 case 2:
 588                                         # Early abort if the page doesn't exist
 589                                         if ( !$this->mPage->exists() ) {
 590                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 591                                                 $this->showMissingArticle();
 592                                                 $this->mPage->doViewUpdates( $user );
 593                                                 return;
 594                                         }
 595
 596                                         # Try the parser cache
 597                                         if ( $useParserCache ) {
 598                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 599
 600                                                 if ( $this->mParserOutput !== false ) {
 601                                                         if ( $oldid ) {
 602                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 603                                                                 $this->setOldSubtitle( $oldid );
 604                                                         } else {
 605                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 606                                                         }
 607                                                         $outputPage->addParserOutput( $this->mParserOutput );
 608                                                         # Ensure that UI elements requiring revision ID have
 609                                                         # the correct version information.
 610                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 611                                                         # Preload timestamp to avoid a DB hit
 612                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 613                                                         if ( $cachedTimestamp !== null ) {
 614                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 615                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 616                                                         }
 617                                                         $outputDone = true;
 618                                                 }
 619                                         }
 620                                         break;
 621                                 case 3:
 622                                         # This will set $this->mRevision if needed
 623                                         $this->fetchContentObject();
 624
 625                                         # Are we looking at an old revision
 626                                         if ( $oldid && $this->mRevision ) {
 627                                                 $this->setOldSubtitle( $oldid );
 628
 629                                                 if ( !$this->showDeletedRevisionHeader() ) {
 630                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 631                                                         return;
 632                                                 }
 633                                         }
 634
 635                                         # Ensure that UI elements requiring revision ID have
 636                                         # the correct version information.
 637                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 638                                         # Preload timestamp to avoid a DB hit
 639                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 640
 641                                         # Pages containing custom CSS or JavaScript get special treatment
 642                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 643                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 644                                                 $this->showCssOrJsPage();
 645                                                 $outputDone = true;
 646                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 647                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 648
 649                                                 # Allow extensions do their own custom view for certain pages
 650                                                 $outputDone = true;
 651                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 652                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 653
 654                                                 # Allow extensions do their own custom view for certain pages
 655                                                 $outputDone = true;
 656                                         }
 657                                         break;
 658                                 case 4:
 659                                         # Run the parse, protected by a pool counter
 660                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 661
 662                                         $content = $this->getContentObject();
 663                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 664                                                 $this->getRevIdFetched(), $useParserCache, $content );
 665
 666                                         if ( !$poolArticleView->execute() ) {
 667                                                 $error = $poolArticleView->getError();
 668                                                 if ( $error ) {
 669                                                         $outputPage->clearHTML(); // for release() errors
 670                                                         $outputPage->enableClientCache( false );
 671                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 672
 673                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 674                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 675                                                 }
 676                                                 # Connection or timeout error
 677                                                 return;
 678                                         }
 679
 680                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 681                                         $outputPage->addParserOutput( $this->mParserOutput );
 682                                         if ( $content->getRedirectTarget() ) {
 683                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 684                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 685                                         }
 686
 687                                         # Don't cache a dirty ParserOutput object
 688                                         if ( $poolArticleView->getIsDirty() ) {
 689                                                 $outputPage->setCdnMaxage( 0 );
 690                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 691                                                         "sending anyway due to pool overload-->\n" );
 692                                         }
 693
 694                                         $outputDone = true;
 695                                         break;
 696                                 # Should be unreachable, but just in case...
 697                                 default:
 698                                         break 2;
 699                         }
 700                 }
 701
 702                 # Get the ParserOutput actually *displayed* here.
 703                 # Note that $this->mParserOutput is the *current*/oldid version output.
 704                 $pOutput = ( $outputDone instanceof ParserOutput )
 705                         ? $outputDone // object fetched by hook
 706                         : $this->mParserOutput;
 707
 708                 # Adjust title for main page & pages with displaytitle
 709                 if ( $pOutput ) {
 710                         $this->adjustDisplayTitle( $pOutput );
 711                 }
 712
 713                 # For the main page, overwrite the <title> element with the con-
 714                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 715                 # that's not empty).
 716                 # This message always exists because it is in the i18n files
 717                 if ( $this->getTitle()->isMainPage() ) {
 718                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 719                         if ( !$msg->isDisabled() ) {
 720                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 721                         }
 722                 }
 723
 724                 # Check for any __NOINDEX__ tags on the page using $pOutput
 725                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 726                 $outputPage->setIndexPolicy( $policy['index'] );
 727                 $outputPage->setFollowPolicy( $policy['follow'] );
 728
 729                 $this->showViewFooter();
 730                 $this->mPage->doViewUpdates( $user, $oldid );
 731
 732                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 733
 734         }
 735
 736         /**
 737          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 738          * @param ParserOutput $pOutput
 739          */
 740         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 741                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 742                 $titleText = $pOutput->getTitleText();
 743                 if ( strval( $titleText ) !== '' ) {
 744                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 745                 }
 746         }
 747
 748         /**
 749          * Show a diff page according to current request variables. For use within
 750          * Article::view() only, other callers should use the DifferenceEngine class.
 751          *
 752          */
 753         protected function showDiffPage() {
 754                 $request = $this->getContext()->getRequest();
 755                 $user = $this->getContext()->getUser();
 756                 $diff = $request->getVal( 'diff' );
 757                 $rcid = $request->getVal( 'rcid' );
 758                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 759                 $purge = $request->getVal( 'action' ) == 'purge';
 760                 $unhide = $request->getInt( 'unhide' ) == 1;
 761                 $oldid = $this->getOldID();
 762
 763                 $rev = $this->getRevisionFetched();
 764
 765                 if ( !$rev ) {
 766                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 767                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 768                                 ->params( $oldid )
 769                                 ->numParams( 1 )
 770                                 ->parseAsBlock();
 771                         $this->getContext()->getOutput()->addHtml( $msg );
 772                         return;
 773                 }
 774
 775                 $contentHandler = $rev->getContentHandler();
 776                 $de = $contentHandler->createDifferenceEngine(
 777                         $this->getContext(),
 778                         $oldid,
 779                         $diff,
 780                         $rcid,
 781                         $purge,
 782                         $unhide
 783                 );
 784
 785                 // DifferenceEngine directly fetched the revision:
 786                 $this->mRevIdFetched = $de->mNewid;
 787                 $de->showDiffPage( $diffOnly );
 788
 789                 // Run view updates for the newer revision being diffed (and shown
 790                 // below the diff if not $diffOnly).
 791                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 792                 // New can be false, convert it to 0 - this conveniently means the latest revision
 793                 $this->mPage->doViewUpdates( $user, (int)$new );
 794         }
 795
 796         /**
 797          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 798          * Article::view() only.
 799          *
 800          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 801          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 802          * more flexibility.
 803          *
 804          * @param bool $showCacheHint Whether to show a message telling the user
 805          *   to clear the browser cache (default: true).
 806          */
 807         protected function showCssOrJsPage( $showCacheHint = true ) {
 808                 $outputPage = $this->getContext()->getOutput();
 809
 810                 if ( $showCacheHint ) {
 811                         $dir = $this->getContext()->getLanguage()->getDir();
 812                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
 813
 814                         $outputPage->wrapWikiMsg(
 815                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 816                                 'clearyourcache'
 817                         );
 818                 }
 819
 820                 $this->fetchContentObject();
 821
 822                 if ( $this->mContentObject ) {
 823                         // Give hooks a chance to customise the output
 824                         if ( ContentHandler::runLegacyHooks(
 825                                 'ShowRawCssJs',
 826                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 827                         ) {
 828                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 829                                 // but excluding metadata like categories and language links
 830                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 831                                 $outputPage->addParserOutputContent( $po );
 832                         }
 833                 }
 834         }
 835
 836         /**
 837          * Get the robot policy to be used for the current view
 838          * @param string $action The action= GET parameter
 839          * @param ParserOutput|null $pOutput
 840          * @return array The policy that should be set
 841          * @todo actions other than 'view'
 842          */
 843         public function getRobotPolicy( $action, $pOutput = null ) {
 844                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 845
 846                 $ns = $this->getTitle()->getNamespace();
 847
 848                 # Don't index user and user talk pages for blocked users (bug 11443)
 849                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 850                         $specificTarget = null;
 851                         $vagueTarget = null;
 852                         $titleText = $this->getTitle()->getText();
 853                         if ( IP::isValid( $titleText ) ) {
 854                                 $vagueTarget = $titleText;
 855                         } else {
 856                                 $specificTarget = $titleText;
 857                         }
 858                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 859                                 return array(
 860                                         'index' => 'noindex',
 861                                         'follow' => 'nofollow'
 862                                 );
 863                         }
 864                 }
 865
 866                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 867                         # Non-articles (special pages etc), and old revisions
 868                         return array(
 869                                 'index' => 'noindex',
 870                                 'follow' => 'nofollow'
 871                         );
 872                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 873                         # Discourage indexing of printable versions, but encourage following
 874                         return array(
 875                                 'index' => 'noindex',
 876                                 'follow' => 'follow'
 877                         );
 878                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 879                         # For ?curid=x urls, disallow indexing
 880                         return array(
 881                                 'index' => 'noindex',
 882                                 'follow' => 'follow'
 883                         );
 884                 }
 885
 886                 # Otherwise, construct the policy based on the various config variables.
 887                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 888
 889                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 890                         # Honour customised robot policies for this namespace
 891                         $policy = array_merge(
 892                                 $policy,
 893                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 894                         );
 895                 }
 896                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 897                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 898                         # a final sanity check that we have really got the parser output.
 899                         $policy = array_merge(
 900                                 $policy,
 901                                 array( 'index' => $pOutput->getIndexPolicy() )
 902                         );
 903                 }
 904
 905                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 906                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 907                         $policy = array_merge(
 908                                 $policy,
 909                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 910                         );
 911                 }
 912
 913                 return $policy;
 914         }
 915
 916         /**
 917          * Converts a String robot policy into an associative array, to allow
 918          * merging of several policies using array_merge().
 919          * @param array|string $policy Returns empty array on null/false/'', transparent
 920          *   to already-converted arrays, converts string.
 921          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 922          */
 923         public static function formatRobotPolicy( $policy ) {
 924                 if ( is_array( $policy ) ) {
 925                         return $policy;
 926                 } elseif ( !$policy ) {
 927                         return array();
 928                 }
 929
 930                 $policy = explode( ',', $policy );
 931                 $policy = array_map( 'trim', $policy );
 932
 933                 $arr = array();
 934                 foreach ( $policy as $var ) {
 935                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 936                                 $arr['index'] = $var;
 937                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 938                                 $arr['follow'] = $var;
 939                         }
 940                 }
 941
 942                 return $arr;
 943         }
 944
 945         /**
 946          * If this request is a redirect view, send "redirected from" subtitle to
 947          * the output. Returns true if the header was needed, false if this is not
 948          * a redirect view. Handles both local and remote redirects.
 949          *
 950          * @return bool
 951          */
 952         public function showRedirectedFromHeader() {
 953                 global $wgRedirectSources;
 954
 955                 $context = $this->getContext();
 956                 $outputPage = $context->getOutput();
 957                 $request = $context->getRequest();
 958                 $rdfrom = $request->getVal( 'rdfrom' );
 959
 960                 // Construct a URL for the current page view, but with the target title
 961                 $query = $request->getValues();
 962                 unset( $query['rdfrom'] );
 963                 unset( $query['title'] );
 964                 if ( $this->getTitle()->isRedirect() ) {
 965                         // Prevent double redirects
 966                         $query['redirect'] = 'no';
 967                 }
 968                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 969
 970                 if ( isset( $this->mRedirectedFrom ) ) {
 971                         // This is an internally redirected page view.
 972                         // We'll need a backlink to the source page for navigation.
 973                         if ( Hooks::run( 'ArticleViewRedirect', array( &$this ) ) ) {
 974                                 $redir = Linker::linkKnown(
 975                                         $this->mRedirectedFrom,
 976                                         null,
 977                                         array(),
 978                                         array( 'redirect' => 'no' )
 979                                 );
 980
 981                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 982                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 983                                 . "</span>" );
 984
 985                                 // Add the script to update the displayed URL and
 986                                 // set the fragment if one was specified in the redirect
 987                                 $outputPage->addJsConfigVars( array(
 988                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 989                                 ) );
 990                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 991
 992                                 // Add a <link rel="canonical"> tag
 993                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
 994
 995                                 // Tell the output object that the user arrived at this article through a redirect
 996                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 997
 998                                 return true;
 999                         }
1000                 } elseif ( $rdfrom ) {
1001                         // This is an externally redirected view, from some other wiki.
1002                         // If it was reported from a trusted site, supply a backlink.
1003                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1004                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1005                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1006                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1007                                 . "</span>" );
1008
1009                                 // Add the script to update the displayed URL
1010                                 $outputPage->addJsConfigVars( array(
1011                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1012                                 ) );
1013                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1014
1015                                 return true;
1016                         }
1017                 }
1018
1019                 return false;
1020         }
1021
1022         /**
1023          * Show a header specific to the namespace currently being viewed, like
1024          * [[MediaWiki:Talkpagetext]]. For Article::view().
1025          */
1026         public function showNamespaceHeader() {
1027                 if ( $this->getTitle()->isTalkPage() ) {
1028                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1029                                 $this->getContext()->getOutput()->wrapWikiMsg(
1030                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1031                                         array( 'talkpageheader' )
1032                                 );
1033                         }
1034                 }
1035         }
1036
1037         /**
1038          * Show the footer section of an ordinary page view
1039          */
1040         public function showViewFooter() {
1041                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1042                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1043                         && IP::isValid( $this->getTitle()->getText() )
1044                 ) {
1045                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1046                 }
1047
1048                 // Show a footer allowing the user to patrol the shown revision or page if possible
1049                 $patrolFooterShown = $this->showPatrolFooter();
1050
1051                 Hooks::run( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1052         }
1053
1054         /**
1055          * If patrol is possible, output a patrol UI box. This is called from the
1056          * footer section of ordinary page views. If patrol is not possible or not
1057          * desired, does nothing.
1058          * Side effect: When the patrol link is build, this method will call
1059          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1060          *
1061          * @return bool
1062          */
1063         public function showPatrolFooter() {
1064                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1065
1066                 $outputPage = $this->getContext()->getOutput();
1067                 $user = $this->getContext()->getUser();
1068                 $rc = false;
1069
1070                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1071                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1072                 ) {
1073                         // Patrolling is disabled or the user isn't allowed to
1074                         return false;
1075                 }
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                 if ( $this->mRevision
1084                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1085                 ) {
1086                         // The current revision is already older than what could be in the RC table
1087                         // 6h tolerance because the RC might not be cleaned out regularly
1088                         return false;
1089                 }
1090
1091                 // Check for cached results
1092                 $key = wfMemcKey( 'unpatrollable-page', $this->getTitle()->getArticleID() );
1093                 $cache = ObjectCache::getMainWANInstance();
1094                 if ( $cache->get( $key ) ) {
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                                 ),
1117                                 __METHOD__
1118                         );
1119                 } else {
1120                         // Cache the information we gathered above in case we can't patrol
1121                         // Don't cache in case we can patrol as this could change
1122                         $cache->set( $key, '1' );
1123                 }
1124
1125                 if ( !$rc ) {
1126                         // Don't cache: This can be hit if the page gets accessed very fast after
1127                         // its creation or in case we have high slave lag. In case the revision is
1128                         // too old, we will already return above.
1129                         return false;
1130                 }
1131
1132                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1133                         // Patrolled RC entry around
1134
1135                         // Cache the information we gathered above in case we can't patrol
1136                         // Don't cache in case we can patrol as this could change
1137                         $cache->set( $key, '1' );
1138
1139                         return false;
1140                 }
1141
1142                 if ( $rc->getPerformer()->equals( $user ) ) {
1143                         // Don't show a patrol link for own creations. If the user could
1144                         // patrol them, they already would be patrolled
1145                         return false;
1146                 }
1147
1148                 $rcid = $rc->getAttribute( 'rc_id' );
1149
1150                 $token = $user->getEditToken( $rcid );
1151
1152                 $outputPage->preventClickjacking();
1153                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1154                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1155                 }
1156
1157                 $link = Linker::linkKnown(
1158                         $this->getTitle(),
1159                         wfMessage( 'markaspatrolledtext' )->escaped(),
1160                         array(),
1161                         array(
1162                                 'action' => 'markpatrolled',
1163                                 'rcid' => $rcid,
1164                                 'token' => $token,
1165                         )
1166                 );
1167
1168                 $outputPage->addHTML(
1169                         "<div class='patrollink'>" .
1170                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1171                         '</div>'
1172                 );
1173
1174                 return true;
1175         }
1176
1177         /**
1178          * Show the error text for a missing article. For articles in the MediaWiki
1179          * namespace, show the default message text. To be called from Article::view().
1180          */
1181         public function showMissingArticle() {
1182                 global $wgSend404Code;
1183
1184                 $outputPage = $this->getContext()->getOutput();
1185                 // Whether the page is a root user page of an existing user (but not a subpage)
1186                 $validUserPage = false;
1187
1188                 $title = $this->getTitle();
1189
1190                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1191                 if ( $title->getNamespace() == NS_USER
1192                         || $title->getNamespace() == NS_USER_TALK
1193                 ) {
1194                         $parts = explode( '/', $title->getText() );
1195                         $rootPart = $parts[0];
1196                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1197                         $ip = User::isIP( $rootPart );
1198                         $block = Block::newFromTarget( $user, $user );
1199
1200                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1201                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1202                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1203                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1204                                 # Show log extract if the user is currently blocked
1205                                 LogEventsList::showLogExtract(
1206                                         $outputPage,
1207                                         'block',
1208                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1209                                         '',
1210                                         array(
1211                                                 'lim' => 1,
1212                                                 'showIfEmpty' => false,
1213                                                 'msgKey' => array(
1214                                                         'blocked-notice-logextract',
1215                                                         $user->getName() # Support GENDER in notice
1216                                                 )
1217                                         )
1218                                 );
1219                                 $validUserPage = !$title->isSubpage();
1220                         } else {
1221                                 $validUserPage = !$title->isSubpage();
1222                         }
1223                 }
1224
1225                 Hooks::run( 'ShowMissingArticle', array( $this ) );
1226
1227                 # Show delete and move logs if there were any such events.
1228                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1229                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1230                 $cache = ObjectCache::getMainStashInstance();
1231                 $key = wfMemcKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1232                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1233                 if ( $loggedIn || $cache->get( $key ) ) {
1234                         $logTypes = array( 'delete', 'move' );
1235                         $conds = array( "log_action != 'revision'" );
1236                         // Give extensions a chance to hide their (unrelated) log entries
1237                         Hooks::run( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1238                         LogEventsList::showLogExtract(
1239                                 $outputPage,
1240                                 $logTypes,
1241                                 $title,
1242                                 '',
1243                                 array(
1244                                         'lim' => 10,
1245                                         'conds' => $conds,
1246                                         'showIfEmpty' => false,
1247                                         'msgKey' => array( $loggedIn
1248                                                 ? 'moveddeleted-notice'
1249                                                 : 'moveddeleted-notice-recent'
1250                                         )
1251                                 )
1252                         );
1253                 }
1254
1255                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1256                         // If there's no backing content, send a 404 Not Found
1257                         // for better machine handling of broken links.
1258                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1259                 }
1260
1261                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1262                 $policy = $this->getRobotPolicy( 'view' );
1263                 $outputPage->setIndexPolicy( $policy['index'] );
1264                 $outputPage->setFollowPolicy( $policy['follow'] );
1265
1266                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', array( $this ) );
1267
1268                 if ( !$hookResult ) {
1269                         return;
1270                 }
1271
1272                 # Show error message
1273                 $oldid = $this->getOldID();
1274                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1275                         $outputPage->addParserOutput( $this->getContentObject()->getParserOutput( $title ) );
1276                 } else {
1277                         if ( $oldid ) {
1278                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1279                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1280                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1281                         ) {
1282                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1283                                 $text = wfMessage( $message )->plain();
1284                         } else {
1285                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1286                         }
1287
1288                         $dir = $this->getContext()->getLanguage()->getDir();
1289                         $lang = $this->getContext()->getLanguage()->getCode();
1290                         $outputPage->addWikiText( Xml::openElement( 'div', array(
1291                                 'class' => "noarticletext mw-content-$dir",
1292                                 'dir' => $dir,
1293                                 'lang' => $lang,
1294                         ) ) . "\n$text\n</div>" );
1295                 }
1296         }
1297
1298         /**
1299          * If the revision requested for view is deleted, check permissions.
1300          * Send either an error message or a warning header to the output.
1301          *
1302          * @return bool True if the view is allowed, false if not.
1303          */
1304         public function showDeletedRevisionHeader() {
1305                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1306                         // Not deleted
1307                         return true;
1308                 }
1309
1310                 $outputPage = $this->getContext()->getOutput();
1311                 $user = $this->getContext()->getUser();
1312                 // If the user is not allowed to see it...
1313                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1314                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1315                                 'rev-deleted-text-permission' );
1316
1317                         return false;
1318                 // If the user needs to confirm that they want to see it...
1319                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1320                         # Give explanation and add a link to view the revision...
1321                         $oldid = intval( $this->getOldID() );
1322                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1323                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1324                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1325                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1326                                 array( $msg, $link ) );
1327
1328                         return false;
1329                 // We are allowed to see...
1330                 } else {
1331                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1332                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1333                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1334
1335                         return true;
1336                 }
1337         }
1338
1339         /**
1340          * Generate the navigation links when browsing through an article revisions
1341          * It shows the information as:
1342          *   Revision as of \<date\>; view current revision
1343          *   \<- Previous version | Next Version -\>
1344          *
1345          * @param int $oldid Revision ID of this article revision
1346          */
1347         public function setOldSubtitle( $oldid = 0 ) {
1348                 if ( !Hooks::run( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1349                         return;
1350                 }
1351
1352                 $context = $this->getContext();
1353                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1354
1355                 # Cascade unhide param in links for easy deletion browsing
1356                 $extraParams = array();
1357                 if ( $unhide ) {
1358                         $extraParams['unhide'] = 1;
1359                 }
1360
1361                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1362                         $revision = $this->mRevision;
1363                 } else {
1364                         $revision = Revision::newFromId( $oldid );
1365                 }
1366
1367                 $timestamp = $revision->getTimestamp();
1368
1369                 $current = ( $oldid == $this->mPage->getLatest() );
1370                 $language = $context->getLanguage();
1371                 $user = $context->getUser();
1372
1373                 $td = $language->userTimeAndDate( $timestamp, $user );
1374                 $tddate = $language->userDate( $timestamp, $user );
1375                 $tdtime = $language->userTime( $timestamp, $user );
1376
1377                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1378                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1379
1380                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1381                         ? 'revision-info-current'
1382                         : 'revision-info';
1383
1384                 $outputPage = $context->getOutput();
1385                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" .
1386                         $context->msg( $infomsg, $td )
1387                                 ->rawParams( $userlinks )
1388                                 ->params( $revision->getID(), $tddate, $tdtime, $revision->getUserText() )
1389                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1390                                 ->parse() .
1391                         "</div>"
1392                 );
1393
1394                 $lnk = $current
1395                         ? $context->msg( 'currentrevisionlink' )->escaped()
1396                         : Linker::linkKnown(
1397                                 $this->getTitle(),
1398                                 $context->msg( 'currentrevisionlink' )->escaped(),
1399                                 array(),
1400                                 $extraParams
1401                         );
1402                 $curdiff = $current
1403                         ? $context->msg( 'diff' )->escaped()
1404                         : Linker::linkKnown(
1405                                 $this->getTitle(),
1406                                 $context->msg( 'diff' )->escaped(),
1407                                 array(),
1408                                 array(
1409                                         'diff' => 'cur',
1410                                         'oldid' => $oldid
1411                                 ) + $extraParams
1412                         );
1413                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1414                 $prevlink = $prev
1415                         ? Linker::linkKnown(
1416                                 $this->getTitle(),
1417                                 $context->msg( 'previousrevision' )->escaped(),
1418                                 array(),
1419                                 array(
1420                                         'direction' => 'prev',
1421                                         'oldid' => $oldid
1422                                 ) + $extraParams
1423                         )
1424                         : $context->msg( 'previousrevision' )->escaped();
1425                 $prevdiff = $prev
1426                         ? Linker::linkKnown(
1427                                 $this->getTitle(),
1428                                 $context->msg( 'diff' )->escaped(),
1429                                 array(),
1430                                 array(
1431                                         'diff' => 'prev',
1432                                         'oldid' => $oldid
1433                                 ) + $extraParams
1434                         )
1435                         : $context->msg( 'diff' )->escaped();
1436                 $nextlink = $current
1437                         ? $context->msg( 'nextrevision' )->escaped()
1438                         : Linker::linkKnown(
1439                                 $this->getTitle(),
1440                                 $context->msg( 'nextrevision' )->escaped(),
1441                                 array(),
1442                                 array(
1443                                         'direction' => 'next',
1444                                         'oldid' => $oldid
1445                                 ) + $extraParams
1446                         );
1447                 $nextdiff = $current
1448                         ? $context->msg( 'diff' )->escaped()
1449                         : Linker::linkKnown(
1450                                 $this->getTitle(),
1451                                 $context->msg( 'diff' )->escaped(),
1452                                 array(),
1453                                 array(
1454                                         'diff' => 'next',
1455                                         'oldid' => $oldid
1456                                 ) + $extraParams
1457                         );
1458
1459                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1460                 if ( $cdel !== '' ) {
1461                         $cdel .= ' ';
1462                 }
1463
1464                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1465                         $context->msg( 'revision-nav' )->rawParams(
1466                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1467                         )->escaped() . "</div>" );
1468         }
1469
1470         /**
1471          * Return the HTML for the top of a redirect page
1472          *
1473          * Chances are you should just be using the ParserOutput from
1474          * WikitextContent::getParserOutput instead of calling this for redirects.
1475          *
1476          * @param Title|array $target Destination(s) to redirect
1477          * @param bool $appendSubtitle [optional]
1478          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1479          * @return string Containing HTML with redirect link
1480          */
1481         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1482                 $lang = $this->getTitle()->getPageLanguage();
1483                 $out = $this->getContext()->getOutput();
1484                 if ( $appendSubtitle ) {
1485                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1486                 }
1487                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1488                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1489         }
1490
1491         /**
1492          * Return the HTML for the top of a redirect page
1493          *
1494          * Chances are you should just be using the ParserOutput from
1495          * WikitextContent::getParserOutput instead of calling this for redirects.
1496          *
1497          * @since 1.23
1498          * @param Language $lang
1499          * @param Title|array $target Destination(s) to redirect
1500          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1501          * @return string Containing HTML with redirect link
1502          */
1503         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1504                 if ( !is_array( $target ) ) {
1505                         $target = array( $target );
1506                 }
1507
1508                 $html = '<ul class="redirectText">';
1509                 /** @var Title $title */
1510                 foreach ( $target as $title ) {
1511                         $html .= '<li>' . Linker::link(
1512                                 $title,
1513                                 htmlspecialchars( $title->getFullText() ),
1514                                 array(),
1515                                 // Automatically append redirect=no to each link, since most of them are
1516                                 // redirect pages themselves.
1517                                 array( 'redirect' => 'no' ),
1518                                 ( $forceKnown ? array( 'known', 'noclasses' ) : array() )
1519                         ) . '</li>';
1520                 }
1521                 $html .= '</ul>';
1522
1523                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1524
1525                 return '<div class="redirectMsg">' .
1526                         '<p>' . $redirectToText . '</p>' .
1527                         $html .
1528                         '</div>';
1529         }
1530
1531         /**
1532          * Adds help link with an icon via page indicators.
1533          * Link target can be overridden by a local message containing a wikilink:
1534          * the message key is: 'namespace-' + namespace number + '-helppage'.
1535          * @param string $to Target MediaWiki.org page title or encoded URL.
1536          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1537          * @since 1.25
1538          */
1539         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1540                 $msg = wfMessage(
1541                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1542                 );
1543
1544                 $out = $this->getContext()->getOutput();
1545                 if ( !$msg->isDisabled() ) {
1546                         $helpUrl = Skin::makeUrl( $msg->plain() );
1547                         $out->addHelpLink( $helpUrl, true );
1548                 } else {
1549                         $out->addHelpLink( $to, $overrideBaseUrl );
1550                 }
1551         }
1552
1553         /**
1554          * Handle action=render
1555          */
1556         public function render() {
1557                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1558                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1559                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1560                 $this->view();
1561         }
1562
1563         /**
1564          * action=protect handler
1565          */
1566         public function protect() {
1567                 $form = new ProtectionForm( $this );
1568                 $form->execute();
1569         }
1570
1571         /**
1572          * action=unprotect handler (alias)
1573          */
1574         public function unprotect() {
1575                 $this->protect();
1576         }
1577
1578         /**
1579          * UI entry point for page deletion
1580          */
1581         public function delete() {
1582                 # This code desperately needs to be totally rewritten
1583
1584                 $title = $this->getTitle();
1585                 $context = $this->getContext();
1586                 $user = $context->getUser();
1587
1588                 # Check permissions
1589                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1590                 if ( count( $permissionErrors ) ) {
1591                         throw new PermissionsError( 'delete', $permissionErrors );
1592                 }
1593
1594                 # Read-only check...
1595                 if ( wfReadOnly() ) {
1596                         throw new ReadOnlyError;
1597                 }
1598
1599                 # Better double-check that it hasn't been deleted yet!
1600                 $this->mPage->loadPageData( 'fromdbmaster' );
1601                 if ( !$this->mPage->exists() ) {
1602                         $deleteLogPage = new LogPage( 'delete' );
1603                         $outputPage = $context->getOutput();
1604                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1605                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1606                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1607                                 );
1608                         $outputPage->addHTML(
1609                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1610                         );
1611                         LogEventsList::showLogExtract(
1612                                 $outputPage,
1613                                 'delete',
1614                                 $title
1615                         );
1616
1617                         return;
1618                 }
1619
1620                 $request = $context->getRequest();
1621                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1622                 $deleteReason = $request->getText( 'wpReason' );
1623
1624                 if ( $deleteReasonList == 'other' ) {
1625                         $reason = $deleteReason;
1626                 } elseif ( $deleteReason != '' ) {
1627                         // Entry from drop down menu + additional comment
1628                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1629                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1630                 } else {
1631                         $reason = $deleteReasonList;
1632                 }
1633
1634                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1635                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1636                 ) {
1637                         # Flag to hide all contents of the archived revisions
1638                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1639
1640                         $this->doDelete( $reason, $suppress );
1641
1642                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1643
1644                         return;
1645                 }
1646
1647                 // Generate deletion reason
1648                 $hasHistory = false;
1649                 if ( !$reason ) {
1650                         try {
1651                                 $reason = $this->generateReason( $hasHistory );
1652                         } catch ( Exception $e ) {
1653                                 # if a page is horribly broken, we still want to be able to
1654                                 # delete it. So be lenient about errors here.
1655                                 wfDebug( "Error while building auto delete summary: $e" );
1656                                 $reason = '';
1657                         }
1658                 }
1659
1660                 // If the page has a history, insert a warning
1661                 if ( $hasHistory ) {
1662                         $title = $this->getTitle();
1663
1664                         // The following can use the real revision count as this is only being shown for users
1665                         // that can delete this page.
1666                         // This, as a side-effect, also makes sure that the following query isn't being run for
1667                         // pages with a larger history, unless the user has the 'bigdelete' right
1668                         // (and is about to delete this page).
1669                         $dbr = wfGetDB( DB_SLAVE );
1670                         $revisions = $edits = (int)$dbr->selectField(
1671                                 'revision',
1672                                 'COUNT(rev_page)',
1673                                 array( 'rev_page' => $title->getArticleID() ),
1674                                 __METHOD__
1675                         );
1676
1677                         // @todo FIXME: i18n issue/patchwork message
1678                         $context->getOutput()->addHTML(
1679                                 '<strong class="mw-delete-warning-revisions">' .
1680                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1681                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1682                                         $context->msg( 'history' )->escaped(),
1683                                         array(),
1684                                         array( 'action' => 'history' ) ) .
1685                                 '</strong>'
1686                         );
1687
1688                         if ( $title->isBigDeletion() ) {
1689                                 global $wgDeleteRevisionsLimit;
1690                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1691                                         array(
1692                                                 'delete-warning-toobig',
1693                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1694                                         )
1695                                 );
1696                         }
1697                 }
1698
1699                 $this->confirmDelete( $reason );
1700         }
1701
1702         /**
1703          * Output deletion confirmation dialog
1704          * @todo FIXME: Move to another file?
1705          * @param string $reason Prefilled reason
1706          */
1707         public function confirmDelete( $reason ) {
1708                 wfDebug( "Article::confirmDelete\n" );
1709
1710                 $title = $this->getTitle();
1711                 $ctx = $this->getContext();
1712                 $outputPage = $ctx->getOutput();
1713                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1714                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1715                 $outputPage->addBacklinkSubtitle( $title );
1716                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1717                 $backlinkCache = $title->getBacklinkCache();
1718                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1719                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1720                                 'deleting-backlinks-warning' );
1721                 }
1722                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1723
1724                 Hooks::run( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1725
1726                 $user = $this->getContext()->getUser();
1727
1728                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1729                         $suppress = Html::openElement( 'div', array( 'id' => 'wpDeleteSuppressRow' ) ) .
1730                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1731                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1732                                 Html::closeElement( 'div' );
1733                 } else {
1734                         $suppress = '';
1735                 }
1736                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1737
1738                 $form = Html::openElement( 'form', array( 'method' => 'post',
1739                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1740                         Html::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1741                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1742                         Html::openElement( 'div', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1743                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonListRow' ) ) .
1744                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1745                         '&nbsp;' .
1746                         Xml::listDropDown(
1747                                 'wpDeleteReasonList',
1748                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1749                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1750                                 '',
1751                                 'wpReasonDropDown',
1752                                 1
1753                         ) .
1754                         Html::closeElement( 'div' ) .
1755                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonRow' ) ) .
1756                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1757                         '&nbsp;' .
1758                         Html::input( 'wpReason', $reason, 'text', array(
1759                                 'size' => '60',
1760                                 'maxlength' => '255',
1761                                 'tabindex' => '2',
1762                                 'id' => 'wpReason',
1763                                 'class' => 'mw-ui-input-inline',
1764                                 'autofocus'
1765                         ) ) .
1766                         Html::closeElement( 'div' );
1767
1768                 # Disallow watching if user is not logged in
1769                 if ( $user->isLoggedIn() ) {
1770                         $form .=
1771                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1772                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) );
1773                 }
1774
1775                 $form .=
1776                                 Html::openElement( 'div' ) .
1777                                 $suppress .
1778                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1779                                                 array(
1780                                                         'name' => 'wpConfirmB',
1781                                                         'id' => 'wpConfirmB',
1782                                                         'tabindex' => '5',
1783                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1784                                                 )
1785                                         ) .
1786                                 Html::closeElement( 'div' ) .
1787                         Html::closeElement( 'div' ) .
1788                         Xml::closeElement( 'fieldset' ) .
1789                         Html::hidden(
1790                                 'wpEditToken',
1791                                 $user->getEditToken( array( 'delete', $title->getPrefixedText() ) )
1792                         ) .
1793                         Xml::closeElement( 'form' );
1794
1795                         if ( $user->isAllowed( 'editinterface' ) ) {
1796                                 $link = Linker::linkKnown(
1797                                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
1798                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1799                                         array(),
1800                                         array( 'action' => 'edit' )
1801                                 );
1802                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1803                         }
1804
1805                 $outputPage->addHTML( $form );
1806
1807                 $deleteLogPage = new LogPage( 'delete' );
1808                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1809                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1810         }
1811
1812         /**
1813          * Perform a deletion and output success or failure messages
1814          * @param string $reason
1815          * @param bool $suppress
1816          */
1817         public function doDelete( $reason, $suppress = false ) {
1818                 $error = '';
1819                 $context = $this->getContext();
1820                 $outputPage = $context->getOutput();
1821                 $user = $context->getUser();
1822                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user );
1823
1824                 if ( $status->isGood() ) {
1825                         $deleted = $this->getTitle()->getPrefixedText();
1826
1827                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1828                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1829
1830                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1831
1832                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1833
1834                         Hooks::run( 'ArticleDeleteAfterSuccess', array( $this->getTitle(), $outputPage ) );
1835
1836                         $outputPage->returnToMain( false );
1837                 } else {
1838                         $outputPage->setPageTitle(
1839                                 wfMessage( 'cannotdelete-title',
1840                                         $this->getTitle()->getPrefixedText() )
1841                         );
1842
1843                         if ( $error == '' ) {
1844                                 $outputPage->addWikiText(
1845                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1846                                 );
1847                                 $deleteLogPage = new LogPage( 'delete' );
1848                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1849
1850                                 LogEventsList::showLogExtract(
1851                                         $outputPage,
1852                                         'delete',
1853                                         $this->getTitle()
1854                                 );
1855                         } else {
1856                                 $outputPage->addHTML( $error );
1857                         }
1858                 }
1859         }
1860
1861         /* Caching functions */
1862
1863         /**
1864          * checkLastModified returns true if it has taken care of all
1865          * output to the client that is necessary for this request.
1866          * (that is, it has sent a cached version of the page)
1867          *
1868          * @return bool True if cached version send, false otherwise
1869          */
1870         protected function tryFileCache() {
1871                 static $called = false;
1872
1873                 if ( $called ) {
1874                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1875                         return false;
1876                 }
1877
1878                 $called = true;
1879                 if ( $this->isFileCacheable() ) {
1880                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1881                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1882                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1883                                 $cache->loadFromFileCache( $this->getContext() );
1884                                 return true;
1885                         } else {
1886                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1887                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1888                         }
1889                 } else {
1890                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1891                 }
1892
1893                 return false;
1894         }
1895
1896         /**
1897          * Check if the page can be cached
1898          * @return bool
1899          */
1900         public function isFileCacheable() {
1901                 $cacheable = false;
1902
1903                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1904                         $cacheable = $this->mPage->getID()
1905                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1906                         // Extension may have reason to disable file caching on some pages.
1907                         if ( $cacheable ) {
1908                                 $cacheable = Hooks::run( 'IsFileCacheable', array( &$this ) );
1909                         }
1910                 }
1911
1912                 return $cacheable;
1913         }
1914
1915         /**#@-*/
1916
1917         /**
1918          * Lightweight method to get the parser output for a page, checking the parser cache
1919          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1920          * consider, so it's not appropriate to use there.
1921          *
1922          * @since 1.16 (r52326) for LiquidThreads
1923          *
1924          * @param int|null $oldid Revision ID or null
1925          * @param User $user The relevant user
1926          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1927          */
1928         public function getParserOutput( $oldid = null, User $user = null ) {
1929                 // XXX: bypasses mParserOptions and thus setParserOptions()
1930
1931                 if ( $user === null ) {
1932                         $parserOptions = $this->getParserOptions();
1933                 } else {
1934                         $parserOptions = $this->mPage->makeParserOptions( $user );
1935                 }
1936
1937                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1938         }
1939
1940         /**
1941          * Override the ParserOptions used to render the primary article wikitext.
1942          *
1943          * @param ParserOptions $options
1944          * @throws MWException If the parser options where already initialized.
1945          */
1946         public function setParserOptions( ParserOptions $options ) {
1947                 if ( $this->mParserOptions ) {
1948                         throw new MWException( "can't change parser options after they have already been set" );
1949                 }
1950
1951                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1952                 $this->mParserOptions = clone $options;
1953         }
1954
1955         /**
1956          * Get parser options suitable for rendering the primary article wikitext
1957          * @return ParserOptions
1958          */
1959         public function getParserOptions() {
1960                 if ( !$this->mParserOptions ) {
1961                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1962                 }
1963                 // Clone to allow modifications of the return value without affecting cache
1964                 return clone $this->mParserOptions;
1965         }
1966
1967         /**
1968          * Sets the context this Article is executed in
1969          *
1970          * @param IContextSource $context
1971          * @since 1.18
1972          */
1973         public function setContext( $context ) {
1974                 $this->mContext = $context;
1975         }
1976
1977         /**
1978          * Gets the context this Article is executed in
1979          *
1980          * @return IContextSource
1981          * @since 1.18
1982          */
1983         public function getContext() {
1984                 if ( $this->mContext instanceof IContextSource ) {
1985                         return $this->mContext;
1986                 } else {
1987                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1988                                 "Return RequestContext::getMain(); for sanity\n" );
1989                         return RequestContext::getMain();
1990                 }
1991         }
1992
1993         /**
1994          * Use PHP's magic __get handler to handle accessing of
1995          * raw WikiPage fields for backwards compatibility.
1996          *
1997          * @param string $fname Field name
1998          * @return mixed
1999          */
2000         public function __get( $fname ) {
2001                 if ( property_exists( $this->mPage, $fname ) ) {
2002                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2003                         return $this->mPage->$fname;
2004                 }
2005                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2006         }
2007
2008         /**
2009          * Use PHP's magic __set handler to handle setting of
2010          * raw WikiPage fields for backwards compatibility.
2011          *
2012          * @param string $fname Field name
2013          * @param mixed $fvalue New value
2014          */
2015         public function __set( $fname, $fvalue ) {
2016                 if ( property_exists( $this->mPage, $fname ) ) {
2017                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2018                         $this->mPage->$fname = $fvalue;
2019                 // Note: extensions may want to toss on new fields
2020                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
2021                         $this->mPage->$fname = $fvalue;
2022                 } else {
2023                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2024                 }
2025         }
2026
2027         /**
2028          * Use PHP's magic __call handler to transform instance calls to
2029          * WikiPage functions for backwards compatibility.
2030          *
2031          * @param string $fname Name of called method
2032          * @param array $args Arguments to the method
2033          * @return mixed
2034          */
2035         public function __call( $fname, $args ) {
2036                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2037                         # wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2038                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2039                 }
2040                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2041         }
2042
2043         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2044
2045         /**
2046          * @param array $limit
2047          * @param array $expiry
2048          * @param bool $cascade
2049          * @param string $reason
2050          * @param User $user
2051          * @return Status
2052          */
2053         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2054                 $reason, User $user
2055         ) {
2056                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2057         }
2058
2059         /**
2060          * @param array $limit
2061          * @param string $reason
2062          * @param int $cascade
2063          * @param array $expiry
2064          * @return bool
2065          */
2066         public function updateRestrictions( $limit = array(), $reason = '',
2067                 &$cascade = 0, $expiry = array()
2068         ) {
2069                 return $this->mPage->doUpdateRestrictions(
2070                         $limit,
2071                         $expiry,
2072                         $cascade,
2073                         $reason,
2074                         $this->getContext()->getUser()
2075                 );
2076         }
2077
2078         /**
2079          * @param string $reason
2080          * @param bool $suppress
2081          * @param int $u1 Unused
2082          * @param bool $u2 Unused
2083          * @param string $error
2084          * @return bool
2085          */
2086         public function doDeleteArticle(
2087                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = ''
2088         ) {
2089                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error );
2090         }
2091
2092         /**
2093          * @param string $fromP
2094          * @param string $summary
2095          * @param string $token
2096          * @param bool $bot
2097          * @param array $resultDetails
2098          * @param User|null $user
2099          * @return array
2100          */
2101         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2102                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2103                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2104         }
2105
2106         /**
2107          * @param string $fromP
2108          * @param string $summary
2109          * @param bool $bot
2110          * @param array $resultDetails
2111          * @param User|null $guser
2112          * @return array
2113          */
2114         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2115                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2116                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2117         }
2118
2119         /**
2120          * @param bool $hasHistory
2121          * @return mixed
2122          */
2123         public function generateReason( &$hasHistory ) {
2124                 $title = $this->mPage->getTitle();
2125                 $handler = ContentHandler::getForTitle( $title );
2126                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2127         }
2128
2129         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2130
2131         /**
2132          * @return array
2133          *
2134          * @deprecated since 1.24, use WikiPage::selectFields() instead
2135          */
2136         public static function selectFields() {
2137                 wfDeprecated( __METHOD__, '1.24' );
2138                 return WikiPage::selectFields();
2139         }
2140
2141         /**
2142          * @param Title $title
2143          *
2144          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2145          */
2146         public static function onArticleCreate( $title ) {
2147                 wfDeprecated( __METHOD__, '1.24' );
2148                 WikiPage::onArticleCreate( $title );
2149         }
2150
2151         /**
2152          * @param Title $title
2153          *
2154          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2155          */
2156         public static function onArticleDelete( $title ) {
2157                 wfDeprecated( __METHOD__, '1.24' );
2158                 WikiPage::onArticleDelete( $title );
2159         }
2160
2161         /**
2162          * @param Title $title
2163          *
2164          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2165          */
2166         public static function onArticleEdit( $title ) {
2167                 wfDeprecated( __METHOD__, '1.24' );
2168                 WikiPage::onArticleEdit( $title );
2169         }
2170
2171         /**
2172          * @param string $oldtext
2173          * @param string $newtext
2174          * @param int $flags
2175          * @return string
2176          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2177          */
2178         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2179                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2180         }
2181         // ******
2182 }