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/loadContent do 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/loadContent do 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          * Load the revision (including text) into this object
 314          *
 315          * @deprecated since 1.19; use fetchContent()
 316          */
 317         function loadContent() {
 318                 wfDeprecated( __METHOD__, '1.19' );
 319                 $this->fetchContent();
 320         }
 321
 322         /**
 323          * Get text of an article from database
 324          * Does *NOT* follow redirects.
 325          *
 326          * @protected
 327          * @note This is really internal functionality that should really NOT be
 328          * used by other functions. For accessing article content, use the WikiPage
 329          * class, especially WikiBase::getContent(). However, a lot of legacy code
 330          * uses this method to retrieve page text from the database, so the function
 331          * has to remain public for now.
 332          *
 333          * @return string|bool String containing article contents, or false if null
 334          * @deprecated since 1.21, use WikiPage::getContent() instead
 335          */
 336         function fetchContent() { #BC cruft!
 337                 ContentHandler::deprecated( __METHOD__, '1.21' );
 338
 339                 if ( $this->mContentLoaded && $this->mContent ) {
 340                         return $this->mContent;
 341                 }
 342
 343                 $content = $this->fetchContentObject();
 344
 345                 if ( !$content ) {
 346                         return false;
 347                 }
 348
 349                 // @todo Get rid of mContent everywhere!
 350                 $this->mContent = ContentHandler::getContentText( $content );
 351                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 352
 353                 return $this->mContent;
 354         }
 355
 356         /**
 357          * Get text content object
 358          * Does *NOT* follow redirects.
 359          * @todo When is this null?
 360          *
 361          * @note Code that wants to retrieve page content from the database should
 362          * use WikiPage::getContent().
 363          *
 364          * @return Content|null|bool
 365          *
 366          * @since 1.21
 367          */
 368         protected function fetchContentObject() {
 369                 if ( $this->mContentLoaded ) {
 370                         return $this->mContentObject;
 371                 }
 372
 373                 $this->mContentLoaded = true;
 374                 $this->mContent = null;
 375
 376                 $oldid = $this->getOldID();
 377
 378                 # Pre-fill content with error message so that if something
 379                 # fails we'll have something telling us what we intended.
 380                 //XXX: this isn't page content but a UI message. horrible.
 381                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 382
 383                 if ( $oldid ) {
 384                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 385                         if ( !$this->mRevision ) {
 386                                 $this->mRevision = Revision::newFromId( $oldid );
 387                                 if ( !$this->mRevision ) {
 388                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 389                                         return false;
 390                                 }
 391                         }
 392                 } else {
 393                         if ( !$this->mPage->getLatest() ) {
 394                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 395                                         $this->getTitle()->getPrefixedText() . "\n" );
 396                                 return false;
 397                         }
 398
 399                         $this->mRevision = $this->mPage->getRevision();
 400
 401                         if ( !$this->mRevision ) {
 402                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " .
 403                                         $this->mPage->getLatest() . "\n" );
 404                                 return false;
 405                         }
 406                 }
 407
 408                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 409                 // We should instead work with the Revision object when we need it...
 410                 // Loads if user is allowed
 411                 $content = $this->mRevision->getContent(
 412                         Revision::FOR_THIS_USER,
 413                         $this->getContext()->getUser()
 414                 );
 415
 416                 if ( !$content ) {
 417                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 418                                 $this->mRevision->getId() . "\n" );
 419                         return false;
 420                 }
 421
 422                 $this->mContentObject = $content;
 423                 $this->mRevIdFetched = $this->mRevision->getId();
 424
 425                 Hooks::run( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 426
 427                 return $this->mContentObject;
 428         }
 429
 430         /**
 431          * Returns true if the currently-referenced revision is the current edit
 432          * to this page (and it exists).
 433          * @return bool
 434          */
 435         public function isCurrent() {
 436                 # If no oldid, this is the current version.
 437                 if ( $this->getOldID() == 0 ) {
 438                         return true;
 439                 }
 440
 441                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 442         }
 443
 444         /**
 445          * Get the fetched Revision object depending on request parameters or null
 446          * on failure.
 447          *
 448          * @since 1.19
 449          * @return Revision|null
 450          */
 451         public function getRevisionFetched() {
 452                 $this->fetchContentObject();
 453
 454                 return $this->mRevision;
 455         }
 456
 457         /**
 458          * Use this to fetch the rev ID used on page views
 459          *
 460          * @return int Revision ID of last article revision
 461          */
 462         public function getRevIdFetched() {
 463                 if ( $this->mRevIdFetched ) {
 464                         return $this->mRevIdFetched;
 465                 } else {
 466                         return $this->mPage->getLatest();
 467                 }
 468         }
 469
 470         /**
 471          * This is the default action of the index.php entry point: just view the
 472          * page of the given title.
 473          */
 474         public function view() {
 475                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar, $wgMaxRedirects;
 476
 477                 # Get variables from query string
 478                 # As side effect this will load the revision and update the title
 479                 # in a revision ID is passed in the request, so this should remain
 480                 # the first call of this method even if $oldid is used way below.
 481                 $oldid = $this->getOldID();
 482
 483                 $user = $this->getContext()->getUser();
 484                 # Another whitelist check in case getOldID() is altering the title
 485                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 486                 if ( count( $permErrors ) ) {
 487                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 488                         throw new PermissionsError( 'read', $permErrors );
 489                 }
 490
 491                 $outputPage = $this->getContext()->getOutput();
 492                 # getOldID() may as well want us to redirect somewhere else
 493                 if ( $this->mRedirectUrl ) {
 494                         $outputPage->redirect( $this->mRedirectUrl );
 495                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 496
 497                         return;
 498                 }
 499
 500                 # If we got diff in the query, we want to see a diff page instead of the article.
 501                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 502                         wfDebug( __METHOD__ . ": showing diff page\n" );
 503                         $this->showDiffPage();
 504
 505                         return;
 506                 }
 507
 508                 # Set page title (may be overridden by DISPLAYTITLE)
 509                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 510
 511                 $outputPage->setArticleFlag( true );
 512                 # Allow frames by default
 513                 $outputPage->allowClickjacking();
 514
 515                 $parserCache = ParserCache::singleton();
 516
 517                 $parserOptions = $this->getParserOptions();
 518                 # Render printable version, use printable version cache
 519                 if ( $outputPage->isPrintable() ) {
 520                         $parserOptions->setIsPrintable( true );
 521                         $parserOptions->setEditSection( false );
 522                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 523                         $parserOptions->setEditSection( false );
 524                 }
 525
 526                 # Try client and file cache
 527                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 528                         if ( $wgUseETag ) {
 529                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 530                         }
 531
 532                         # Use the greatest of the page's timestamp or the timestamp of any
 533                         # redirect in the chain (bug 67849)
 534                         $timestamp = $this->mPage->getTouched();
 535                         if ( isset( $this->mRedirectedFrom ) ) {
 536                                 $timestamp = max( $timestamp, $this->mRedirectedFrom->getTouched() );
 537
 538                                 # If there can be more than one redirect in the chain, we have
 539                                 # to go through the whole chain too in case an intermediate
 540                                 # redirect was changed.
 541                                 if ( $wgMaxRedirects > 1 ) {
 542                                         $titles = Revision::newFromTitle( $this->mRedirectedFrom )
 543                                                 ->getContent( Revision::FOR_THIS_USER, $user )
 544                                                 ->getRedirectChain();
 545                                         $thisTitle = $this->getTitle();
 546                                         foreach ( $titles as $title ) {
 547                                                 if ( Title::compare( $title, $thisTitle ) === 0 ) {
 548                                                         break;
 549                                                 }
 550                                                 $timestamp = max( $timestamp, $title->getTouched() );
 551                                         }
 552                                 }
 553                         }
 554
 555                         # Is it client cached?
 556                         if ( $outputPage->checkLastModified( $timestamp ) ) {
 557                                 wfDebug( __METHOD__ . ": done 304\n" );
 558
 559                                 return;
 560                         # Try file cache
 561                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 562                                 wfDebug( __METHOD__ . ": done file cache\n" );
 563                                 # tell wgOut that output is taken care of
 564                                 $outputPage->disable();
 565                                 $this->mPage->doViewUpdates( $user, $oldid );
 566
 567                                 return;
 568                         }
 569                 }
 570
 571                 # Should the parser cache be used?
 572                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 573                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 574                 if ( $user->getStubThreshold() ) {
 575                         $this->getContext()->getStats()->increment( 'pcache_miss_stub' );
 576                 }
 577
 578                 $this->showRedirectedFromHeader();
 579                 $this->showNamespaceHeader();
 580
 581                 # Iterate through the possible ways of constructing the output text.
 582                 # Keep going until $outputDone is set, or we run out of things to do.
 583                 $pass = 0;
 584                 $outputDone = false;
 585                 $this->mParserOutput = false;
 586
 587                 while ( !$outputDone && ++$pass ) {
 588                         switch ( $pass ) {
 589                                 case 1:
 590                                         Hooks::run( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 591                                         break;
 592                                 case 2:
 593                                         # Early abort if the page doesn't exist
 594                                         if ( !$this->mPage->exists() ) {
 595                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 596                                                 $this->showMissingArticle();
 597                                                 $this->mPage->doViewUpdates( $user );
 598                                                 return;
 599                                         }
 600
 601                                         # Try the parser cache
 602                                         if ( $useParserCache ) {
 603                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 604
 605                                                 if ( $this->mParserOutput !== false ) {
 606                                                         if ( $oldid ) {
 607                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 608                                                                 $this->setOldSubtitle( $oldid );
 609                                                         } else {
 610                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 611                                                         }
 612                                                         $outputPage->addParserOutput( $this->mParserOutput );
 613                                                         # Ensure that UI elements requiring revision ID have
 614                                                         # the correct version information.
 615                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 616                                                         # Preload timestamp to avoid a DB hit
 617                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 618                                                         if ( $cachedTimestamp !== null ) {
 619                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 620                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 621                                                         }
 622                                                         $outputDone = true;
 623                                                 }
 624                                         }
 625                                         break;
 626                                 case 3:
 627                                         # This will set $this->mRevision if needed
 628                                         $this->fetchContentObject();
 629
 630                                         # Are we looking at an old revision
 631                                         if ( $oldid && $this->mRevision ) {
 632                                                 $this->setOldSubtitle( $oldid );
 633
 634                                                 if ( !$this->showDeletedRevisionHeader() ) {
 635                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 636                                                         return;
 637                                                 }
 638                                         }
 639
 640                                         # Ensure that UI elements requiring revision ID have
 641                                         # the correct version information.
 642                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 643                                         # Preload timestamp to avoid a DB hit
 644                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 645
 646                                         # Pages containing custom CSS or JavaScript get special treatment
 647                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 648                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 649                                                 $this->showCssOrJsPage();
 650                                                 $outputDone = true;
 651                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 652                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 653
 654                                                 # Allow extensions do their own custom view for certain pages
 655                                                 $outputDone = true;
 656                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 657                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 658
 659                                                 # Allow extensions do their own custom view for certain pages
 660                                                 $outputDone = true;
 661                                         }
 662                                         break;
 663                                 case 4:
 664                                         # Run the parse, protected by a pool counter
 665                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 666
 667                                         $content = $this->getContentObject();
 668                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 669                                                 $this->getRevIdFetched(), $useParserCache, $content );
 670
 671                                         if ( !$poolArticleView->execute() ) {
 672                                                 $error = $poolArticleView->getError();
 673                                                 if ( $error ) {
 674                                                         $outputPage->clearHTML(); // for release() errors
 675                                                         $outputPage->enableClientCache( false );
 676                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 677
 678                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 679                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 680                                                 }
 681                                                 # Connection or timeout error
 682                                                 return;
 683                                         }
 684
 685                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 686                                         $outputPage->addParserOutput( $this->mParserOutput );
 687                                         if ( $content->getRedirectTarget() ) {
 688                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 689                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 690                                         }
 691
 692                                         # Don't cache a dirty ParserOutput object
 693                                         if ( $poolArticleView->getIsDirty() ) {
 694                                                 $outputPage->setSquidMaxage( 0 );
 695                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 696                                                         "sending anyway due to pool overload-->\n" );
 697                                         }
 698
 699                                         $outputDone = true;
 700                                         break;
 701                                 # Should be unreachable, but just in case...
 702                                 default:
 703                                         break 2;
 704                         }
 705                 }
 706
 707                 # Get the ParserOutput actually *displayed* here.
 708                 # Note that $this->mParserOutput is the *current*/oldid version output.
 709                 $pOutput = ( $outputDone instanceof ParserOutput )
 710                         ? $outputDone // object fetched by hook
 711                         : $this->mParserOutput;
 712
 713                 # Adjust title for main page & pages with displaytitle
 714                 if ( $pOutput ) {
 715                         $this->adjustDisplayTitle( $pOutput );
 716                 }
 717
 718                 # For the main page, overwrite the <title> element with the con-
 719                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 720                 # that's not empty).
 721                 # This message always exists because it is in the i18n files
 722                 if ( $this->getTitle()->isMainPage() ) {
 723                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 724                         if ( !$msg->isDisabled() ) {
 725                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 726                         }
 727                 }
 728
 729                 # Check for any __NOINDEX__ tags on the page using $pOutput
 730                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 731                 $outputPage->setIndexPolicy( $policy['index'] );
 732                 $outputPage->setFollowPolicy( $policy['follow'] );
 733
 734                 $this->showViewFooter();
 735                 $this->mPage->doViewUpdates( $user, $oldid );
 736
 737                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 738
 739         }
 740
 741         /**
 742          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 743          * @param ParserOutput $pOutput
 744          */
 745         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 746                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 747                 $titleText = $pOutput->getTitleText();
 748                 if ( strval( $titleText ) !== '' ) {
 749                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 750                 }
 751         }
 752
 753         /**
 754          * Show a diff page according to current request variables. For use within
 755          * Article::view() only, other callers should use the DifferenceEngine class.
 756          *
 757          */
 758         protected function showDiffPage() {
 759                 $request = $this->getContext()->getRequest();
 760                 $user = $this->getContext()->getUser();
 761                 $diff = $request->getVal( 'diff' );
 762                 $rcid = $request->getVal( 'rcid' );
 763                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 764                 $purge = $request->getVal( 'action' ) == 'purge';
 765                 $unhide = $request->getInt( 'unhide' ) == 1;
 766                 $oldid = $this->getOldID();
 767
 768                 $rev = $this->getRevisionFetched();
 769
 770                 if ( !$rev ) {
 771                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 772                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 773                                 ->params( $oldid )
 774                                 ->numParams( 1 )
 775                                 ->parseAsBlock();
 776                         $this->getContext()->getOutput()->addHtml( $msg );
 777                         return;
 778                 }
 779
 780                 $contentHandler = $rev->getContentHandler();
 781                 $de = $contentHandler->createDifferenceEngine(
 782                         $this->getContext(),
 783                         $oldid,
 784                         $diff,
 785                         $rcid,
 786                         $purge,
 787                         $unhide
 788                 );
 789
 790                 // DifferenceEngine directly fetched the revision:
 791                 $this->mRevIdFetched = $de->mNewid;
 792                 $de->showDiffPage( $diffOnly );
 793
 794                 // Run view updates for the newer revision being diffed (and shown
 795                 // below the diff if not $diffOnly).
 796                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 797                 // New can be false, convert it to 0 - this conveniently means the latest revision
 798                 $this->mPage->doViewUpdates( $user, (int)$new );
 799         }
 800
 801         /**
 802          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 803          * Article::view() only.
 804          *
 805          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 806          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 807          * more flexibility.
 808          *
 809          * @param bool $showCacheHint Whether to show a message telling the user
 810          *   to clear the browser cache (default: true).
 811          */
 812         protected function showCssOrJsPage( $showCacheHint = true ) {
 813                 $outputPage = $this->getContext()->getOutput();
 814
 815                 if ( $showCacheHint ) {
 816                         $dir = $this->getContext()->getLanguage()->getDir();
 817                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
 818
 819                         $outputPage->wrapWikiMsg(
 820                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 821                                 'clearyourcache'
 822                         );
 823                 }
 824
 825                 $this->fetchContentObject();
 826
 827                 if ( $this->mContentObject ) {
 828                         // Give hooks a chance to customise the output
 829                         if ( ContentHandler::runLegacyHooks(
 830                                 'ShowRawCssJs',
 831                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 832                         ) {
 833                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 834                                 // but excluding metadata like categories and language links
 835                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 836                                 $outputPage->addParserOutputContent( $po );
 837                         }
 838                 }
 839         }
 840
 841         /**
 842          * Get the robot policy to be used for the current view
 843          * @param string $action The action= GET parameter
 844          * @param ParserOutput|null $pOutput
 845          * @return array The policy that should be set
 846          * @todo actions other than 'view'
 847          */
 848         public function getRobotPolicy( $action, $pOutput = null ) {
 849                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 850
 851                 $ns = $this->getTitle()->getNamespace();
 852
 853                 # Don't index user and user talk pages for blocked users (bug 11443)
 854                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 855                         $specificTarget = null;
 856                         $vagueTarget = null;
 857                         $titleText = $this->getTitle()->getText();
 858                         if ( IP::isValid( $titleText ) ) {
 859                                 $vagueTarget = $titleText;
 860                         } else {
 861                                 $specificTarget = $titleText;
 862                         }
 863                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 864                                 return array(
 865                                         'index' => 'noindex',
 866                                         'follow' => 'nofollow'
 867                                 );
 868                         }
 869                 }
 870
 871                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 872                         # Non-articles (special pages etc), and old revisions
 873                         return array(
 874                                 'index' => 'noindex',
 875                                 'follow' => 'nofollow'
 876                         );
 877                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 878                         # Discourage indexing of printable versions, but encourage following
 879                         return array(
 880                                 'index' => 'noindex',
 881                                 'follow' => 'follow'
 882                         );
 883                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 884                         # For ?curid=x urls, disallow indexing
 885                         return array(
 886                                 'index' => 'noindex',
 887                                 'follow' => 'follow'
 888                         );
 889                 }
 890
 891                 # Otherwise, construct the policy based on the various config variables.
 892                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 893
 894                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 895                         # Honour customised robot policies for this namespace
 896                         $policy = array_merge(
 897                                 $policy,
 898                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 899                         );
 900                 }
 901                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 902                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 903                         # a final sanity check that we have really got the parser output.
 904                         $policy = array_merge(
 905                                 $policy,
 906                                 array( 'index' => $pOutput->getIndexPolicy() )
 907                         );
 908                 }
 909
 910                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 911                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 912                         $policy = array_merge(
 913                                 $policy,
 914                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 915                         );
 916                 }
 917
 918                 return $policy;
 919         }
 920
 921         /**
 922          * Converts a String robot policy into an associative array, to allow
 923          * merging of several policies using array_merge().
 924          * @param array|string $policy Returns empty array on null/false/'', transparent
 925          *   to already-converted arrays, converts string.
 926          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 927          */
 928         public static function formatRobotPolicy( $policy ) {
 929                 if ( is_array( $policy ) ) {
 930                         return $policy;
 931                 } elseif ( !$policy ) {
 932                         return array();
 933                 }
 934
 935                 $policy = explode( ',', $policy );
 936                 $policy = array_map( 'trim', $policy );
 937
 938                 $arr = array();
 939                 foreach ( $policy as $var ) {
 940                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 941                                 $arr['index'] = $var;
 942                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 943                                 $arr['follow'] = $var;
 944                         }
 945                 }
 946
 947                 return $arr;
 948         }
 949
 950         /**
 951          * If this request is a redirect view, send "redirected from" subtitle to
 952          * the output. Returns true if the header was needed, false if this is not
 953          * a redirect view. Handles both local and remote redirects.
 954          *
 955          * @return bool
 956          */
 957         public function showRedirectedFromHeader() {
 958                 global $wgRedirectSources;
 959
 960                 $context = $this->getContext();
 961                 $outputPage = $context->getOutput();
 962                 $request = $context->getRequest();
 963                 $rdfrom = $request->getVal( 'rdfrom' );
 964
 965                 // Construct a URL for the current page view, but with the target title
 966                 $query = $request->getValues();
 967                 unset( $query['rdfrom'] );
 968                 unset( $query['title'] );
 969                 if ( $this->getTitle()->isRedirect() ) {
 970                         // Prevent double redirects
 971                         $query['redirect'] = 'no';
 972                 }
 973                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 974
 975                 if ( isset( $this->mRedirectedFrom ) ) {
 976                         // This is an internally redirected page view.
 977                         // We'll need a backlink to the source page for navigation.
 978                         if ( Hooks::run( 'ArticleViewRedirect', array( &$this ) ) ) {
 979                                 $redir = Linker::linkKnown(
 980                                         $this->mRedirectedFrom,
 981                                         null,
 982                                         array(),
 983                                         array( 'redirect' => 'no' )
 984                                 );
 985
 986                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 987                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 988                                 . "</span>" );
 989
 990                                 // Add the script to update the displayed URL and
 991                                 // set the fragment if one was specified in the redirect
 992                                 $outputPage->addJsConfigVars( array(
 993                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 994                                 ) );
 995                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 996
 997                                 // Add a <link rel="canonical"> tag
 998                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 999
1000                                 // Tell the output object that the user arrived at this article through a redirect
1001                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1002
1003                                 return true;
1004                         }
1005                 } elseif ( $rdfrom ) {
1006                         // This is an externally redirected view, from some other wiki.
1007                         // If it was reported from a trusted site, supply a backlink.
1008                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1009                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1010                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1011                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1012                                 . "</span>" );
1013
1014                                 // Add the script to update the displayed URL
1015                                 $outputPage->addJsConfigVars( array(
1016                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1017                                 ) );
1018                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1019
1020                                 return true;
1021                         }
1022                 }
1023
1024                 return false;
1025         }
1026
1027         /**
1028          * Show a header specific to the namespace currently being viewed, like
1029          * [[MediaWiki:Talkpagetext]]. For Article::view().
1030          */
1031         public function showNamespaceHeader() {
1032                 if ( $this->getTitle()->isTalkPage() ) {
1033                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1034                                 $this->getContext()->getOutput()->wrapWikiMsg(
1035                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1036                                         array( 'talkpageheader' )
1037                                 );
1038                         }
1039                 }
1040         }
1041
1042         /**
1043          * Show the footer section of an ordinary page view
1044          */
1045         public function showViewFooter() {
1046                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1047                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1048                         && IP::isValid( $this->getTitle()->getText() )
1049                 ) {
1050                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1051                 }
1052
1053                 // Show a footer allowing the user to patrol the shown revision or page if possible
1054                 $patrolFooterShown = $this->showPatrolFooter();
1055
1056                 Hooks::run( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1057         }
1058
1059         /**
1060          * If patrol is possible, output a patrol UI box. This is called from the
1061          * footer section of ordinary page views. If patrol is not possible or not
1062          * desired, does nothing.
1063          * Side effect: When the patrol link is build, this method will call
1064          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1065          *
1066          * @return bool
1067          */
1068         public function showPatrolFooter() {
1069                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1070
1071                 $outputPage = $this->getContext()->getOutput();
1072                 $user = $this->getContext()->getUser();
1073                 $cache = wfGetMainCache();
1074                 $rc = false;
1075
1076                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1077                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1078                 ) {
1079                         // Patrolling is disabled or the user isn't allowed to
1080                         return false;
1081                 }
1082
1083                 // New page patrol: Get the timestamp of the oldest revison which
1084                 // the revision table holds for the given page. Then we look
1085                 // whether it's within the RC lifespan and if it is, we try
1086                 // to get the recentchanges row belonging to that entry
1087                 // (with rc_new = 1).
1088
1089                 // Check for cached results
1090                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1091                         return false;
1092                 }
1093
1094                 if ( $this->mRevision
1095                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1096                 ) {
1097                         // The current revision is already older than what could be in the RC table
1098                         // 6h tolerance because the RC might not be cleaned out regularly
1099                         return false;
1100                 }
1101
1102                 $dbr = wfGetDB( DB_SLAVE );
1103                 $oldestRevisionTimestamp = $dbr->selectField(
1104                         'revision',
1105                         'MIN( rev_timestamp )',
1106                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1107                         __METHOD__
1108                 );
1109
1110                 if ( $oldestRevisionTimestamp
1111                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1112                 ) {
1113                         // 6h tolerance because the RC might not be cleaned out regularly
1114                         $rc = RecentChange::newFromConds(
1115                                 array(
1116                                         'rc_new' => 1,
1117                                         'rc_timestamp' => $oldestRevisionTimestamp,
1118                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1119                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1120                                         'rc_patrolled' => 0
1121                                 ),
1122                                 __METHOD__,
1123                                 array( 'USE INDEX' => 'new_name_timestamp' )
1124                         );
1125                 }
1126
1127                 if ( !$rc ) {
1128                         // No RC entry around
1129
1130                         // Cache the information we gathered above in case we can't patrol
1131                         // Don't cache in case we can patrol as this could change
1132                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1133
1134                         return false;
1135                 }
1136
1137                 if ( $rc->getPerformer()->equals( $user ) ) {
1138                         // Don't show a patrol link for own creations. If the user could
1139                         // patrol them, they already would be patrolled
1140                         return false;
1141                 }
1142
1143                 $rcid = $rc->getAttribute( 'rc_id' );
1144
1145                 $token = $user->getEditToken( $rcid );
1146
1147                 $outputPage->preventClickjacking();
1148                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1149                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1150                 }
1151
1152                 $link = Linker::linkKnown(
1153                         $this->getTitle(),
1154                         wfMessage( 'markaspatrolledtext' )->escaped(),
1155                         array(),
1156                         array(
1157                                 'action' => 'markpatrolled',
1158                                 'rcid' => $rcid,
1159                                 'token' => $token,
1160                         )
1161                 );
1162
1163                 $outputPage->addHTML(
1164                         "<div class='patrollink'>" .
1165                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1166                         '</div>'
1167                 );
1168
1169                 return true;
1170         }
1171
1172         /**
1173          * Show the error text for a missing article. For articles in the MediaWiki
1174          * namespace, show the default message text. To be called from Article::view().
1175          */
1176         public function showMissingArticle() {
1177                 global $wgSend404Code;
1178
1179                 $outputPage = $this->getContext()->getOutput();
1180                 // Whether the page is a root user page of an existing user (but not a subpage)
1181                 $validUserPage = false;
1182
1183                 $title = $this->getTitle();
1184
1185                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1186                 if ( $title->getNamespace() == NS_USER
1187                         || $title->getNamespace() == NS_USER_TALK
1188                 ) {
1189                         $parts = explode( '/', $title->getText() );
1190                         $rootPart = $parts[0];
1191                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1192                         $ip = User::isIP( $rootPart );
1193                         $block = Block::newFromTarget( $user, $user );
1194
1195                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1196                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1197                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1198                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1199                                 # Show log extract if the user is currently blocked
1200                                 LogEventsList::showLogExtract(
1201                                         $outputPage,
1202                                         'block',
1203                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1204                                         '',
1205                                         array(
1206                                                 'lim' => 1,
1207                                                 'showIfEmpty' => false,
1208                                                 'msgKey' => array(
1209                                                         'blocked-notice-logextract',
1210                                                         $user->getName() # Support GENDER in notice
1211                                                 )
1212                                         )
1213                                 );
1214                                 $validUserPage = !$title->isSubpage();
1215                         } else {
1216                                 $validUserPage = !$title->isSubpage();
1217                         }
1218                 }
1219
1220                 Hooks::run( 'ShowMissingArticle', array( $this ) );
1221
1222                 // Give extensions a chance to hide their (unrelated) log entries
1223                 $logTypes = array( 'delete', 'move' );
1224                 $conds = array( "log_action != 'revision'" );
1225                 Hooks::run( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1226
1227                 # Show delete and move logs
1228                 LogEventsList::showLogExtract( $outputPage, $logTypes, $title, '',
1229                         array( 'lim' => 10,
1230                                 'conds' => $conds,
1231                                 'showIfEmpty' => false,
1232                                 'msgKey' => array( 'moveddeleted-notice' ) )
1233                 );
1234
1235                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1236                         // If there's no backing content, send a 404 Not Found
1237                         // for better machine handling of broken links.
1238                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1239                 }
1240
1241                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1242                 $policy = $this->getRobotPolicy( 'view' );
1243                 $outputPage->setIndexPolicy( $policy['index'] );
1244                 $outputPage->setFollowPolicy( $policy['follow'] );
1245
1246                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', array( $this ) );
1247
1248                 if ( !$hookResult ) {
1249                         return;
1250                 }
1251
1252                 # Show error message
1253                 $oldid = $this->getOldID();
1254                 if ( $oldid ) {
1255                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1256                 } elseif ( $title->getNamespace() === NS_MEDIAWIKI ) {
1257                         // Use the default message text
1258                         $text = $title->getDefaultMessageText();
1259                 } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1260                         && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1261                 ) {
1262                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1263                         $text = wfMessage( $message )->plain();
1264                 } else {
1265                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1266                 }
1267                 $text = "<div class='noarticletext'>\n$text\n</div>";
1268
1269                 $outputPage->addWikiText( $text );
1270         }
1271
1272         /**
1273          * If the revision requested for view is deleted, check permissions.
1274          * Send either an error message or a warning header to the output.
1275          *
1276          * @return bool True if the view is allowed, false if not.
1277          */
1278         public function showDeletedRevisionHeader() {
1279                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1280                         // Not deleted
1281                         return true;
1282                 }
1283
1284                 $outputPage = $this->getContext()->getOutput();
1285                 $user = $this->getContext()->getUser();
1286                 // If the user is not allowed to see it...
1287                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1288                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1289                                 'rev-deleted-text-permission' );
1290
1291                         return false;
1292                 // If the user needs to confirm that they want to see it...
1293                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1294                         # Give explanation and add a link to view the revision...
1295                         $oldid = intval( $this->getOldID() );
1296                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1297                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1298                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1299                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1300                                 array( $msg, $link ) );
1301
1302                         return false;
1303                 // We are allowed to see...
1304                 } else {
1305                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1306                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1307                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1308
1309                         return true;
1310                 }
1311         }
1312
1313         /**
1314          * Generate the navigation links when browsing through an article revisions
1315          * It shows the information as:
1316          *   Revision as of \<date\>; view current revision
1317          *   \<- Previous version | Next Version -\>
1318          *
1319          * @param int $oldid Revision ID of this article revision
1320          */
1321         public function setOldSubtitle( $oldid = 0 ) {
1322                 if ( !Hooks::run( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1323                         return;
1324                 }
1325
1326                 $context = $this->getContext();
1327                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1328
1329                 # Cascade unhide param in links for easy deletion browsing
1330                 $extraParams = array();
1331                 if ( $unhide ) {
1332                         $extraParams['unhide'] = 1;
1333                 }
1334
1335                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1336                         $revision = $this->mRevision;
1337                 } else {
1338                         $revision = Revision::newFromId( $oldid );
1339                 }
1340
1341                 $timestamp = $revision->getTimestamp();
1342
1343                 $current = ( $oldid == $this->mPage->getLatest() );
1344                 $language = $context->getLanguage();
1345                 $user = $context->getUser();
1346
1347                 $td = $language->userTimeAndDate( $timestamp, $user );
1348                 $tddate = $language->userDate( $timestamp, $user );
1349                 $tdtime = $language->userTime( $timestamp, $user );
1350
1351                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1352                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1353
1354                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1355                         ? 'revision-info-current'
1356                         : 'revision-info';
1357
1358                 $outputPage = $context->getOutput();
1359                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" .
1360                         $context->msg( $infomsg, $td )
1361                                 ->rawParams( $userlinks )
1362                                 ->params( $revision->getID(), $tddate, $tdtime, $revision->getUserText() )
1363                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1364                                 ->parse() .
1365                         "</div>"
1366                 );
1367
1368                 $lnk = $current
1369                         ? $context->msg( 'currentrevisionlink' )->escaped()
1370                         : Linker::linkKnown(
1371                                 $this->getTitle(),
1372                                 $context->msg( 'currentrevisionlink' )->escaped(),
1373                                 array(),
1374                                 $extraParams
1375                         );
1376                 $curdiff = $current
1377                         ? $context->msg( 'diff' )->escaped()
1378                         : Linker::linkKnown(
1379                                 $this->getTitle(),
1380                                 $context->msg( 'diff' )->escaped(),
1381                                 array(),
1382                                 array(
1383                                         'diff' => 'cur',
1384                                         'oldid' => $oldid
1385                                 ) + $extraParams
1386                         );
1387                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1388                 $prevlink = $prev
1389                         ? Linker::linkKnown(
1390                                 $this->getTitle(),
1391                                 $context->msg( 'previousrevision' )->escaped(),
1392                                 array(),
1393                                 array(
1394                                         'direction' => 'prev',
1395                                         'oldid' => $oldid
1396                                 ) + $extraParams
1397                         )
1398                         : $context->msg( 'previousrevision' )->escaped();
1399                 $prevdiff = $prev
1400                         ? Linker::linkKnown(
1401                                 $this->getTitle(),
1402                                 $context->msg( 'diff' )->escaped(),
1403                                 array(),
1404                                 array(
1405                                         'diff' => 'prev',
1406                                         'oldid' => $oldid
1407                                 ) + $extraParams
1408                         )
1409                         : $context->msg( 'diff' )->escaped();
1410                 $nextlink = $current
1411                         ? $context->msg( 'nextrevision' )->escaped()
1412                         : Linker::linkKnown(
1413                                 $this->getTitle(),
1414                                 $context->msg( 'nextrevision' )->escaped(),
1415                                 array(),
1416                                 array(
1417                                         'direction' => 'next',
1418                                         'oldid' => $oldid
1419                                 ) + $extraParams
1420                         );
1421                 $nextdiff = $current
1422                         ? $context->msg( 'diff' )->escaped()
1423                         : Linker::linkKnown(
1424                                 $this->getTitle(),
1425                                 $context->msg( 'diff' )->escaped(),
1426                                 array(),
1427                                 array(
1428                                         'diff' => 'next',
1429                                         'oldid' => $oldid
1430                                 ) + $extraParams
1431                         );
1432
1433                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1434                 if ( $cdel !== '' ) {
1435                         $cdel .= ' ';
1436                 }
1437
1438                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1439                         $context->msg( 'revision-nav' )->rawParams(
1440                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1441                         )->escaped() . "</div>" );
1442         }
1443
1444         /**
1445          * Return the HTML for the top of a redirect page
1446          *
1447          * Chances are you should just be using the ParserOutput from
1448          * WikitextContent::getParserOutput instead of calling this for redirects.
1449          *
1450          * @param Title|array $target Destination(s) to redirect
1451          * @param bool $appendSubtitle [optional]
1452          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1453          * @return string Containing HTML with redirect link
1454          */
1455         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1456                 $lang = $this->getTitle()->getPageLanguage();
1457                 $out = $this->getContext()->getOutput();
1458                 if ( $appendSubtitle ) {
1459                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1460                 }
1461                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1462                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1463         }
1464
1465         /**
1466          * Return the HTML for the top of a redirect page
1467          *
1468          * Chances are you should just be using the ParserOutput from
1469          * WikitextContent::getParserOutput instead of calling this for redirects.
1470          *
1471          * @since 1.23
1472          * @param Language $lang
1473          * @param Title|array $target Destination(s) to redirect
1474          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1475          * @return string Containing HTML with redirect link
1476          */
1477         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1478                 if ( !is_array( $target ) ) {
1479                         $target = array( $target );
1480                 }
1481
1482                 $html = '<ul class="redirectText">';
1483                 /** @var Title $title */
1484                 foreach ( $target as $title ) {
1485                         $html .= '<li>' . Linker::link(
1486                                 $title,
1487                                 htmlspecialchars( $title->getFullText() ),
1488                                 array(),
1489                                 // Automatically append redirect=no to each link, since most of them are
1490                                 // redirect pages themselves.
1491                                 array( 'redirect' => 'no' ),
1492                                 ( $forceKnown ? array( 'known', 'noclasses' ) : array() )
1493                         ) . '</li>';
1494                 }
1495                 $html .= '</ul>';
1496
1497                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1498
1499                 return '<div class="redirectMsg">' .
1500                         '<p>' . $redirectToText . '</p>' .
1501                         $html .
1502                         '</div>';
1503         }
1504
1505         /**
1506          * Handle action=render
1507          */
1508         public function render() {
1509                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1510                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1511                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1512                 $this->view();
1513         }
1514
1515         /**
1516          * action=protect handler
1517          */
1518         public function protect() {
1519                 $form = new ProtectionForm( $this );
1520                 $form->execute();
1521         }
1522
1523         /**
1524          * action=unprotect handler (alias)
1525          */
1526         public function unprotect() {
1527                 $this->protect();
1528         }
1529
1530         /**
1531          * UI entry point for page deletion
1532          */
1533         public function delete() {
1534                 # This code desperately needs to be totally rewritten
1535
1536                 $title = $this->getTitle();
1537                 $context = $this->getContext();
1538                 $user = $context->getUser();
1539
1540                 # Check permissions
1541                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1542                 if ( count( $permissionErrors ) ) {
1543                         throw new PermissionsError( 'delete', $permissionErrors );
1544                 }
1545
1546                 # Read-only check...
1547                 if ( wfReadOnly() ) {
1548                         throw new ReadOnlyError;
1549                 }
1550
1551                 # Better double-check that it hasn't been deleted yet!
1552                 $this->mPage->loadPageData( 'fromdbmaster' );
1553                 if ( !$this->mPage->exists() ) {
1554                         $deleteLogPage = new LogPage( 'delete' );
1555                         $outputPage = $context->getOutput();
1556                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1557                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1558                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1559                                 );
1560                         $outputPage->addHTML(
1561                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1562                         );
1563                         LogEventsList::showLogExtract(
1564                                 $outputPage,
1565                                 'delete',
1566                                 $title
1567                         );
1568
1569                         return;
1570                 }
1571
1572                 $request = $context->getRequest();
1573                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1574                 $deleteReason = $request->getText( 'wpReason' );
1575
1576                 if ( $deleteReasonList == 'other' ) {
1577                         $reason = $deleteReason;
1578                 } elseif ( $deleteReason != '' ) {
1579                         // Entry from drop down menu + additional comment
1580                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1581                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1582                 } else {
1583                         $reason = $deleteReasonList;
1584                 }
1585
1586                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1587                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1588                 ) {
1589                         # Flag to hide all contents of the archived revisions
1590                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1591
1592                         $this->doDelete( $reason, $suppress );
1593
1594                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1595
1596                         return;
1597                 }
1598
1599                 // Generate deletion reason
1600                 $hasHistory = false;
1601                 if ( !$reason ) {
1602                         try {
1603                                 $reason = $this->generateReason( $hasHistory );
1604                         } catch ( Exception $e ) {
1605                                 # if a page is horribly broken, we still want to be able to
1606                                 # delete it. So be lenient about errors here.
1607                                 wfDebug( "Error while building auto delete summary: $e" );
1608                                 $reason = '';
1609                         }
1610                 }
1611
1612                 // If the page has a history, insert a warning
1613                 if ( $hasHistory ) {
1614                         $title = $this->getTitle();
1615
1616                         // The following can use the real revision count as this is only being shown for users
1617                         // that can delete this page.
1618                         // This, as a side-effect, also makes sure that the following query isn't being run for
1619                         // pages with a larger history, unless the user has the 'bigdelete' right
1620                         // (and is about to delete this page).
1621                         $dbr = wfGetDB( DB_SLAVE );
1622                         $revisions = $edits = (int)$dbr->selectField(
1623                                 'revision',
1624                                 'COUNT(rev_page)',
1625                                 array( 'rev_page' => $title->getArticleID() ),
1626                                 __METHOD__
1627                         );
1628
1629                         // @todo FIXME: i18n issue/patchwork message
1630                         $context->getOutput()->addHTML(
1631                                 '<strong class="mw-delete-warning-revisions">' .
1632                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1633                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1634                                         $context->msg( 'history' )->escaped(),
1635                                         array(),
1636                                         array( 'action' => 'history' ) ) .
1637                                 '</strong>'
1638                         );
1639
1640                         if ( $title->isBigDeletion() ) {
1641                                 global $wgDeleteRevisionsLimit;
1642                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1643                                         array(
1644                                                 'delete-warning-toobig',
1645                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1646                                         )
1647                                 );
1648                         }
1649                 }
1650
1651                 $this->confirmDelete( $reason );
1652         }
1653
1654         /**
1655          * Output deletion confirmation dialog
1656          * @todo FIXME: Move to another file?
1657          * @param string $reason Prefilled reason
1658          */
1659         public function confirmDelete( $reason ) {
1660                 wfDebug( "Article::confirmDelete\n" );
1661
1662                 $title = $this->getTitle();
1663                 $ctx = $this->getContext();
1664                 $outputPage = $ctx->getOutput();
1665                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1666                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1667                 $outputPage->addBacklinkSubtitle( $title );
1668                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1669                 $backlinkCache = $title->getBacklinkCache();
1670                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1671                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1672                                 'deleting-backlinks-warning' );
1673                 }
1674                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1675
1676                 Hooks::run( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1677
1678                 $user = $this->getContext()->getUser();
1679
1680                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1681                         $suppress = Html::openElement( 'div', array( 'id' => 'wpDeleteSuppressRow' ) ) .
1682                                 "<strong>" .
1683                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1684                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1685                                         "</strong>" .
1686                                 Html::closeElement( 'div' );
1687                 } else {
1688                         $suppress = '';
1689                 }
1690                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1691
1692                 $form = Html::openElement( 'form', array( 'method' => 'post',
1693                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1694                         Html::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1695                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1696                         Html::openElement( 'div', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1697                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonListRow' ) ) .
1698                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1699                         '&nbsp;' .
1700                         Xml::listDropDown(
1701                                 'wpDeleteReasonList',
1702                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1703                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1704                                 '',
1705                                 'wpReasonDropDown',
1706                                 1
1707                         ) .
1708                         Html::closeElement( 'div' ) .
1709                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonRow' ) ) .
1710                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1711                         '&nbsp;' .
1712                         Html::input( 'wpReason', $reason, 'text', array(
1713                                 'size' => '60',
1714                                 'maxlength' => '255',
1715                                 'tabindex' => '2',
1716                                 'id' => 'wpReason',
1717                                 'class' => 'mw-ui-input-inline',
1718                                 'autofocus'
1719                         ) ) .
1720                         Html::closeElement( 'div' );
1721
1722                 # Disallow watching if user is not logged in
1723                 if ( $user->isLoggedIn() ) {
1724                         $form .=
1725                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1726                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) );
1727                 }
1728
1729                 $form .=
1730                                 Html::openElement( 'div' ) .
1731                                 $suppress .
1732                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1733                                                 array(
1734                                                         'name' => 'wpConfirmB',
1735                                                         'id' => 'wpConfirmB',
1736                                                         'tabindex' => '5',
1737                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1738                                                 )
1739                                         ) .
1740                                 Html::closeElement( 'div' ) .
1741                         Html::closeElement( 'div' ) .
1742                         Xml::closeElement( 'fieldset' ) .
1743                         Html::hidden(
1744                                 'wpEditToken',
1745                                 $user->getEditToken( array( 'delete', $title->getPrefixedText() ) )
1746                         ) .
1747                         Xml::closeElement( 'form' );
1748
1749                         if ( $user->isAllowed( 'editinterface' ) ) {
1750                                 $dropdownTitle = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1751                                 $link = Linker::link(
1752                                         $dropdownTitle,
1753                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1754                                         array(),
1755                                         array( 'action' => 'edit' )
1756                                 );
1757                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1758                         }
1759
1760                 $outputPage->addHTML( $form );
1761
1762                 $deleteLogPage = new LogPage( 'delete' );
1763                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1764                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1765         }
1766
1767         /**
1768          * Perform a deletion and output success or failure messages
1769          * @param string $reason
1770          * @param bool $suppress
1771          */
1772         public function doDelete( $reason, $suppress = false ) {
1773                 $error = '';
1774                 $outputPage = $this->getContext()->getOutput();
1775                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1776
1777                 if ( $status->isGood() ) {
1778                         $deleted = $this->getTitle()->getPrefixedText();
1779
1780                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1781                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1782
1783                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1784
1785                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1786
1787                         Hooks::run( 'ArticleDeleteAfterSuccess', array( $this->getTitle(), $outputPage ) );
1788
1789                         $outputPage->returnToMain( false );
1790                 } else {
1791                         $outputPage->setPageTitle(
1792                                 wfMessage( 'cannotdelete-title',
1793                                         $this->getTitle()->getPrefixedText() )
1794                         );
1795
1796                         if ( $error == '' ) {
1797                                 $outputPage->addWikiText(
1798                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1799                                 );
1800                                 $deleteLogPage = new LogPage( 'delete' );
1801                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1802
1803                                 LogEventsList::showLogExtract(
1804                                         $outputPage,
1805                                         'delete',
1806                                         $this->getTitle()
1807                                 );
1808                         } else {
1809                                 $outputPage->addHTML( $error );
1810                         }
1811                 }
1812         }
1813
1814         /* Caching functions */
1815
1816         /**
1817          * checkLastModified returns true if it has taken care of all
1818          * output to the client that is necessary for this request.
1819          * (that is, it has sent a cached version of the page)
1820          *
1821          * @return bool True if cached version send, false otherwise
1822          */
1823         protected function tryFileCache() {
1824                 static $called = false;
1825
1826                 if ( $called ) {
1827                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1828                         return false;
1829                 }
1830
1831                 $called = true;
1832                 if ( $this->isFileCacheable() ) {
1833                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1834                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1835                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1836                                 $cache->loadFromFileCache( $this->getContext() );
1837                                 return true;
1838                         } else {
1839                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1840                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1841                         }
1842                 } else {
1843                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1844                 }
1845
1846                 return false;
1847         }
1848
1849         /**
1850          * Check if the page can be cached
1851          * @return bool
1852          */
1853         public function isFileCacheable() {
1854                 $cacheable = false;
1855
1856                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1857                         $cacheable = $this->mPage->getID()
1858                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1859                         // Extension may have reason to disable file caching on some pages.
1860                         if ( $cacheable ) {
1861                                 $cacheable = Hooks::run( 'IsFileCacheable', array( &$this ) );
1862                         }
1863                 }
1864
1865                 return $cacheable;
1866         }
1867
1868         /**#@-*/
1869
1870         /**
1871          * Lightweight method to get the parser output for a page, checking the parser cache
1872          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1873          * consider, so it's not appropriate to use there.
1874          *
1875          * @since 1.16 (r52326) for LiquidThreads
1876          *
1877          * @param int|null $oldid Revision ID or null
1878          * @param User $user The relevant user
1879          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1880          */
1881         public function getParserOutput( $oldid = null, User $user = null ) {
1882                 //XXX: bypasses mParserOptions and thus setParserOptions()
1883
1884                 if ( $user === null ) {
1885                         $parserOptions = $this->getParserOptions();
1886                 } else {
1887                         $parserOptions = $this->mPage->makeParserOptions( $user );
1888                 }
1889
1890                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1891         }
1892
1893         /**
1894          * Override the ParserOptions used to render the primary article wikitext.
1895          *
1896          * @param ParserOptions $options
1897          * @throws MWException If the parser options where already initialized.
1898          */
1899         public function setParserOptions( ParserOptions $options ) {
1900                 if ( $this->mParserOptions ) {
1901                         throw new MWException( "can't change parser options after they have already been set" );
1902                 }
1903
1904                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1905                 $this->mParserOptions = clone $options;
1906         }
1907
1908         /**
1909          * Get parser options suitable for rendering the primary article wikitext
1910          * @return ParserOptions
1911          */
1912         public function getParserOptions() {
1913                 if ( !$this->mParserOptions ) {
1914                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1915                 }
1916                 // Clone to allow modifications of the return value without affecting cache
1917                 return clone $this->mParserOptions;
1918         }
1919
1920         /**
1921          * Sets the context this Article is executed in
1922          *
1923          * @param IContextSource $context
1924          * @since 1.18
1925          */
1926         public function setContext( $context ) {
1927                 $this->mContext = $context;
1928         }
1929
1930         /**
1931          * Gets the context this Article is executed in
1932          *
1933          * @return IContextSource
1934          * @since 1.18
1935          */
1936         public function getContext() {
1937                 if ( $this->mContext instanceof IContextSource ) {
1938                         return $this->mContext;
1939                 } else {
1940                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1941                                 "Return RequestContext::getMain(); for sanity\n" );
1942                         return RequestContext::getMain();
1943                 }
1944         }
1945
1946         /**
1947          * Use PHP's magic __get handler to handle accessing of
1948          * raw WikiPage fields for backwards compatibility.
1949          *
1950          * @param string $fname Field name
1951          * @return mixed
1952          */
1953         public function __get( $fname ) {
1954                 if ( property_exists( $this->mPage, $fname ) ) {
1955                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1956                         return $this->mPage->$fname;
1957                 }
1958                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1959         }
1960
1961         /**
1962          * Use PHP's magic __set handler to handle setting of
1963          * raw WikiPage fields for backwards compatibility.
1964          *
1965          * @param string $fname Field name
1966          * @param mixed $fvalue New value
1967          */
1968         public function __set( $fname, $fvalue ) {
1969                 if ( property_exists( $this->mPage, $fname ) ) {
1970                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1971                         $this->mPage->$fname = $fvalue;
1972                 // Note: extensions may want to toss on new fields
1973                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1974                         $this->mPage->$fname = $fvalue;
1975                 } else {
1976                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1977                 }
1978         }
1979
1980         /**
1981          * Use PHP's magic __call handler to transform instance calls to
1982          * WikiPage functions for backwards compatibility.
1983          *
1984          * @param string $fname Name of called method
1985          * @param array $args Arguments to the method
1986          * @return mixed
1987          */
1988         public function __call( $fname, $args ) {
1989                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1990                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1991                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1992                 }
1993                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1994         }
1995
1996         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1997
1998         /**
1999          * @param array $limit
2000          * @param array $expiry
2001          * @param bool $cascade
2002          * @param string $reason
2003          * @param User $user
2004          * @return Status
2005          */
2006         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2007                 $reason, User $user
2008         ) {
2009                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2010         }
2011
2012         /**
2013          * @param array $limit
2014          * @param string $reason
2015          * @param int $cascade
2016          * @param array $expiry
2017          * @return bool
2018          */
2019         public function updateRestrictions( $limit = array(), $reason = '',
2020                 &$cascade = 0, $expiry = array()
2021         ) {
2022                 return $this->mPage->doUpdateRestrictions(
2023                         $limit,
2024                         $expiry,
2025                         $cascade,
2026                         $reason,
2027                         $this->getContext()->getUser()
2028                 );
2029         }
2030
2031         /**
2032          * @param string $reason
2033          * @param bool $suppress
2034          * @param int $id
2035          * @param bool $commit
2036          * @param string $error
2037          * @return bool
2038          */
2039         public function doDeleteArticle( $reason, $suppress = false, $id = 0,
2040                 $commit = true, &$error = ''
2041         ) {
2042                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2043         }
2044
2045         /**
2046          * @param string $fromP
2047          * @param string $summary
2048          * @param string $token
2049          * @param bool $bot
2050          * @param array $resultDetails
2051          * @param User|null $user
2052          * @return array
2053          */
2054         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2055                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2056                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2057         }
2058
2059         /**
2060          * @param string $fromP
2061          * @param string $summary
2062          * @param bool $bot
2063          * @param array $resultDetails
2064          * @param User|null $guser
2065          * @return array
2066          */
2067         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2068                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2069                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2070         }
2071
2072         /**
2073          * @param bool $hasHistory
2074          * @return mixed
2075          */
2076         public function generateReason( &$hasHistory ) {
2077                 $title = $this->mPage->getTitle();
2078                 $handler = ContentHandler::getForTitle( $title );
2079                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2080         }
2081
2082         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2083
2084         /**
2085          * @return array
2086          *
2087          * @deprecated since 1.24, use WikiPage::selectFields() instead
2088          */
2089         public static function selectFields() {
2090                 wfDeprecated( __METHOD__, '1.24' );
2091                 return WikiPage::selectFields();
2092         }
2093
2094         /**
2095          * @param Title $title
2096          *
2097          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2098          */
2099         public static function onArticleCreate( $title ) {
2100                 wfDeprecated( __METHOD__, '1.24' );
2101                 WikiPage::onArticleCreate( $title );
2102         }
2103
2104         /**
2105          * @param Title $title
2106          *
2107          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2108          */
2109         public static function onArticleDelete( $title ) {
2110                 wfDeprecated( __METHOD__, '1.24' );
2111                 WikiPage::onArticleDelete( $title );
2112         }
2113
2114         /**
2115          * @param Title $title
2116          *
2117          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2118          */
2119         public static function onArticleEdit( $title ) {
2120                 wfDeprecated( __METHOD__, '1.24' );
2121                 WikiPage::onArticleEdit( $title );
2122         }
2123
2124         /**
2125          * @param string $oldtext
2126          * @param string $newtext
2127          * @param int $flags
2128          * @return string
2129          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2130          */
2131         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2132                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2133         }
2134         // ******
2135 }