includes/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class Article implements Page {
  37         /**@{{
  38          * @private
  39          */
  40
  41         /**
  42          * The context this Article is executed in
  43          * @var IContextSource $mContext
  44          */
  45         protected $mContext;
  46
  47         /**
  48          * The WikiPage object of this instance
  49          * @var WikiPage $mPage
  50          */
  51         protected $mPage;
  52
  53         /**
  54          * ParserOptions object for $wgUser articles
  55          * @var ParserOptions $mParserOptions
  56          */
  57         public $mParserOptions;
  58
  59         /**
  60          * Text of the revision we are working on
  61          * @var string $mContent
  62          */
  63         var $mContent;                    // !< #BC cruft
  64
  65         /**
  66          * Content of the revision we are working on
  67          * @var Content
  68          * @since 1.21
  69          */
  70         var $mContentObject;              // !<
  71
  72         /**
  73          * Is the content ($mContent) already loaded?
  74          * @var bool $mContentLoaded
  75          */
  76         var $mContentLoaded = false;      // !<
  77
  78         /**
  79          * The oldid of the article that is to be shown, 0 for the
  80          * current revision
  81          * @var int|null $mOldId
  82          */
  83         var $mOldId;                      // !<
  84
  85         /**
  86          * Title from which we were redirected here
  87          * @var Title $mRedirectedFrom
  88          */
  89         var $mRedirectedFrom = null;
  90
  91         /**
  92          * URL to redirect to or false if none
  93          * @var string|false $mRedirectUrl
  94          */
  95         var $mRedirectUrl = false;        // !<
  96
  97         /**
  98          * Revision ID of revision we are working on
  99          * @var int $mRevIdFetched
 100          */
 101         var $mRevIdFetched = 0;           // !<
 102
 103         /**
 104          * Revision we are working on
 105          * @var Revision $mRevision
 106          */
 107         var $mRevision = null;
 108
 109         /**
 110          * ParserOutput object
 111          * @var ParserOutput $mParserOutput
 112          */
 113         var $mParserOutput;
 114
 115         /**@}}*/
 116
 117         /**
 118          * Constructor and clear the article
 119          * @param $title Title Reference to a Title object.
 120          * @param $oldId Integer revision ID, null to fetch from request, zero for current
 121          */
 122         public function __construct( Title $title, $oldId = null ) {
 123                 $this->mOldId = $oldId;
 124                 $this->mPage = $this->newPage( $title );
 125         }
 126
 127         /**
 128          * @param $title Title
 129          * @return WikiPage
 130          */
 131         protected function newPage( Title $title ) {
 132                 return new WikiPage( $title );
 133         }
 134
 135         /**
 136          * Constructor from a page id
 137          * @param int $id article ID to load
 138          * @return Article|null
 139          */
 140         public static function newFromID( $id ) {
 141                 $t = Title::newFromID( $id );
 142                 # @todo FIXME: Doesn't inherit right
 143                 return $t == null ? null : new self( $t );
 144                 # return $t == null ? null : new static( $t ); // PHP 5.3
 145         }
 146
 147         /**
 148          * Create an Article object of the appropriate class for the given page.
 149          *
 150          * @param $title Title
 151          * @param $context IContextSource
 152          * @return Article object
 153          */
 154         public static function newFromTitle( $title, IContextSource $context ) {
 155                 if ( NS_MEDIA == $title->getNamespace() ) {
 156                         // FIXME: where should this go?
 157                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 158                 }
 159
 160                 $page = null;
 161                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 162                 if ( !$page ) {
 163                         switch ( $title->getNamespace() ) {
 164                                 case NS_FILE:
 165                                         $page = new ImagePage( $title );
 166                                         break;
 167                                 case NS_CATEGORY:
 168                                         $page = new CategoryPage( $title );
 169                                         break;
 170                                 default:
 171                                         $page = new Article( $title );
 172                         }
 173                 }
 174                 $page->setContext( $context );
 175
 176                 return $page;
 177         }
 178
 179         /**
 180          * Create an Article object of the appropriate class for the given page.
 181          *
 182          * @param $page WikiPage
 183          * @param $context IContextSource
 184          * @return Article object
 185          */
 186         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 187                 $article = self::newFromTitle( $page->getTitle(), $context );
 188                 $article->mPage = $page; // override to keep process cached vars
 189                 return $article;
 190         }
 191
 192         /**
 193          * Tell the page view functions that this view was redirected
 194          * from another page on the wiki.
 195          * @param $from Title object.
 196          */
 197         public function setRedirectedFrom( Title $from ) {
 198                 $this->mRedirectedFrom = $from;
 199         }
 200
 201         /**
 202          * Get the title object of the article
 203          *
 204          * @return Title object of this page
 205          */
 206         public function getTitle() {
 207                 return $this->mPage->getTitle();
 208         }
 209
 210         /**
 211          * Get the WikiPage object of this instance
 212          *
 213          * @since 1.19
 214          * @return WikiPage
 215          */
 216         public function getPage() {
 217                 return $this->mPage;
 218         }
 219
 220         /**
 221          * Clear the object
 222          */
 223         public function clear() {
 224                 $this->mContentLoaded = false;
 225
 226                 $this->mRedirectedFrom = null; # Title object if set
 227                 $this->mRevIdFetched = 0;
 228                 $this->mRedirectUrl = false;
 229
 230                 $this->mPage->clear();
 231         }
 232
 233         /**
 234          * Note that getContent/loadContent do not follow redirects anymore.
 235          * If you need to fetch redirectable content easily, try
 236          * the shortcut in WikiPage::getRedirectTarget()
 237          *
 238          * This function has side effects! Do not use this function if you
 239          * only want the real revision text if any.
 240          *
 241          * @deprecated in 1.21; use WikiPage::getContent() instead
 242          *
 243          * @return string Return the text of this revision
 244          */
 245         public function getContent() {
 246                 ContentHandler::deprecated( __METHOD__, '1.21' );
 247                 $content = $this->getContentObject();
 248                 return ContentHandler::getContentText( $content );
 249         }
 250
 251         /**
 252          * Returns a Content object representing the pages effective display content,
 253          * not necessarily the revision's content!
 254          *
 255          * Note that getContent/loadContent do not follow redirects anymore.
 256          * If you need to fetch redirectable content easily, try
 257          * the shortcut in WikiPage::getRedirectTarget()
 258          *
 259          * This function has side effects! Do not use this function if you
 260          * only want the real revision text if any.
 261          *
 262          * @return Content Return the content of this revision
 263          *
 264          * @since 1.21
 265          */
 266         protected function getContentObject() {
 267                 wfProfileIn( __METHOD__ );
 268
 269                 if ( $this->mPage->getID() === 0 ) {
 270                         # If this is a MediaWiki:x message, then load the messages
 271                         # and return the message value for x.
 272                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 273                                 $text = $this->getTitle()->getDefaultMessageText();
 274                                 if ( $text === false ) {
 275                                         $text = '';
 276                                 }
 277
 278                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 279                         } else {
 280                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 281                                 $content = new MessageContent( $message, null, 'parsemag' );
 282                         }
 283                 } else {
 284                         $this->fetchContentObject();
 285                         $content = $this->mContentObject;
 286                 }
 287
 288                 wfProfileOut( __METHOD__ );
 289                 return $content;
 290         }
 291
 292         /**
 293          * @return int The oldid of the article that is to be shown, 0 for the
 294          *             current revision
 295          */
 296         public function getOldID() {
 297                 if ( is_null( $this->mOldId ) ) {
 298                         $this->mOldId = $this->getOldIDFromRequest();
 299                 }
 300
 301                 return $this->mOldId;
 302         }
 303
 304         /**
 305          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 306          *
 307          * @return int The old id for the request
 308          */
 309         public function getOldIDFromRequest() {
 310                 $this->mRedirectUrl = false;
 311
 312                 $request = $this->getContext()->getRequest();
 313                 $oldid = $request->getIntOrNull( 'oldid' );
 314
 315                 if ( $oldid === null ) {
 316                         return 0;
 317                 }
 318
 319                 if ( $oldid !== 0 ) {
 320                         # Load the given revision and check whether the page is another one.
 321                         # In that case, update this instance to reflect the change.
 322                         if ( $oldid === $this->mPage->getLatest() ) {
 323                                 $this->mRevision = $this->mPage->getRevision();
 324                         } else {
 325                                 $this->mRevision = Revision::newFromId( $oldid );
 326                                 if ( $this->mRevision !== null ) {
 327                                         // Revision title doesn't match the page title given?
 328                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 329                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 330                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 331                                         }
 332                                 }
 333                         }
 334                 }
 335
 336                 if ( $request->getVal( 'direction' ) == 'next' ) {
 337                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 338                         if ( $nextid ) {
 339                                 $oldid = $nextid;
 340                                 $this->mRevision = null;
 341                         } else {
 342                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 343                         }
 344                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 345                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 346                         if ( $previd ) {
 347                                 $oldid = $previd;
 348                                 $this->mRevision = null;
 349                         }
 350                 }
 351
 352                 return $oldid;
 353         }
 354
 355         /**
 356          * Load the revision (including text) into this object
 357          *
 358          * @deprecated in 1.19; use fetchContent()
 359          */
 360         function loadContent() {
 361                 wfDeprecated( __METHOD__, '1.19' );
 362                 $this->fetchContent();
 363         }
 364
 365         /**
 366          * Get text of an article from database
 367          * Does *NOT* follow redirects.
 368          *
 369          * @protected
 370          * @note this is really internal functionality that should really NOT be used by other functions. For accessing
 371          *       article content, use the WikiPage class, especially WikiBase::getContent(). However, a lot of legacy code
 372          *       uses this method to retrieve page text from the database, so the function has to remain public for now.
 373          *
 374          * @return mixed string containing article contents, or false if null
 375          * @deprecated in 1.21, use WikiPage::getContent() instead
 376          */
 377         function fetchContent() { #BC cruft!
 378                 ContentHandler::deprecated( __METHOD__, '1.21' );
 379
 380                 if ( $this->mContentLoaded && $this->mContent ) {
 381                         return $this->mContent;
 382                 }
 383
 384                 wfProfileIn( __METHOD__ );
 385
 386                 $content = $this->fetchContentObject();
 387
 388                 // @todo Get rid of mContent everywhere!
 389                 $this->mContent = ContentHandler::getContentText( $content );
 390                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 391
 392                 wfProfileOut( __METHOD__ );
 393
 394                 return $this->mContent;
 395         }
 396
 397         /**
 398          * Get text content object
 399          * Does *NOT* follow redirects.
 400          * TODO: when is this null?
 401          *
 402          * @note code that wants to retrieve page content from the database should use WikiPage::getContent().
 403          *
 404          * @return Content|null|boolean false
 405          *
 406          * @since 1.21
 407          */
 408         protected function fetchContentObject() {
 409                 if ( $this->mContentLoaded ) {
 410                         return $this->mContentObject;
 411                 }
 412
 413                 wfProfileIn( __METHOD__ );
 414
 415                 $this->mContentLoaded = true;
 416                 $this->mContent = null;
 417
 418                 $oldid = $this->getOldID();
 419
 420                 # Pre-fill content with error message so that if something
 421                 # fails we'll have something telling us what we intended.
 422                 //XXX: this isn't page content but a UI message. horrible.
 423                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 424
 425                 if ( $oldid ) {
 426                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 427                         if ( !$this->mRevision ) {
 428                                 $this->mRevision = Revision::newFromId( $oldid );
 429                                 if ( !$this->mRevision ) {
 430                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 431                                         wfProfileOut( __METHOD__ );
 432                                         return false;
 433                                 }
 434                         }
 435                 } else {
 436                         if ( !$this->mPage->getLatest() ) {
 437                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 438                                 wfProfileOut( __METHOD__ );
 439                                 return false;
 440                         }
 441
 442                         $this->mRevision = $this->mPage->getRevision();
 443
 444                         if ( !$this->mRevision ) {
 445                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 446                                 wfProfileOut( __METHOD__ );
 447                                 return false;
 448                         }
 449                 }
 450
 451                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 452                 // We should instead work with the Revision object when we need it...
 453                 $this->mContentObject = $this->mRevision->getContent( Revision::FOR_THIS_USER, $this->getContext()->getUser() ); // Loads if user is allowed
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455
 456                 wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 457
 458                 wfProfileOut( __METHOD__ );
 459
 460                 return $this->mContentObject;
 461         }
 462
 463         /**
 464          * No-op
 465          * @deprecated since 1.18
 466          */
 467         public function forUpdate() {
 468                 wfDeprecated( __METHOD__, '1.18' );
 469         }
 470
 471         /**
 472          * Returns true if the currently-referenced revision is the current edit
 473          * to this page (and it exists).
 474          * @return bool
 475          */
 476         public function isCurrent() {
 477                 # If no oldid, this is the current version.
 478                 if ( $this->getOldID() == 0 ) {
 479                         return true;
 480                 }
 481
 482                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 483         }
 484
 485         /**
 486          * Get the fetched Revision object depending on request parameters or null
 487          * on failure.
 488          *
 489          * @since 1.19
 490          * @return Revision|null
 491          */
 492         public function getRevisionFetched() {
 493                 $this->fetchContentObject();
 494
 495                 return $this->mRevision;
 496         }
 497
 498         /**
 499          * Use this to fetch the rev ID used on page views
 500          *
 501          * @return int revision ID of last article revision
 502          */
 503         public function getRevIdFetched() {
 504                 if ( $this->mRevIdFetched ) {
 505                         return $this->mRevIdFetched;
 506                 } else {
 507                         return $this->mPage->getLatest();
 508                 }
 509         }
 510
 511         /**
 512          * This is the default action of the index.php entry point: just view the
 513          * page of the given title.
 514          */
 515         public function view() {
 516                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 517
 518                 wfProfileIn( __METHOD__ );
 519
 520                 # Get variables from query string
 521                 # As side effect this will load the revision and update the title
 522                 # in a revision ID is passed in the request, so this should remain
 523                 # the first call of this method even if $oldid is used way below.
 524                 $oldid = $this->getOldID();
 525
 526                 $user = $this->getContext()->getUser();
 527                 # Another whitelist check in case getOldID() is altering the title
 528                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 529                 if ( count( $permErrors ) ) {
 530                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 531                         wfProfileOut( __METHOD__ );
 532                         throw new PermissionsError( 'read', $permErrors );
 533                 }
 534
 535                 $outputPage = $this->getContext()->getOutput();
 536                 # getOldID() may as well want us to redirect somewhere else
 537                 if ( $this->mRedirectUrl ) {
 538                         $outputPage->redirect( $this->mRedirectUrl );
 539                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 540                         wfProfileOut( __METHOD__ );
 541
 542                         return;
 543                 }
 544
 545                 # If we got diff in the query, we want to see a diff page instead of the article.
 546                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 547                         wfDebug( __METHOD__ . ": showing diff page\n" );
 548                         $this->showDiffPage();
 549                         wfProfileOut( __METHOD__ );
 550
 551                         return;
 552                 }
 553
 554                 # Set page title (may be overridden by DISPLAYTITLE)
 555                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 556
 557                 $outputPage->setArticleFlag( true );
 558                 # Allow frames by default
 559                 $outputPage->allowClickjacking();
 560
 561                 $parserCache = ParserCache::singleton();
 562
 563                 $parserOptions = $this->getParserOptions();
 564                 # Render printable version, use printable version cache
 565                 if ( $outputPage->isPrintable() ) {
 566                         $parserOptions->setIsPrintable( true );
 567                         $parserOptions->setEditSection( false );
 568                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 569                         $parserOptions->setEditSection( false );
 570                 }
 571
 572                 # Try client and file cache
 573                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 574                         if ( $wgUseETag ) {
 575                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 576                         }
 577
 578                         # Is it client cached?
 579                         if ( $outputPage->checkLastModified( $this->mPage->getTouched() ) ) {
 580                                 wfDebug( __METHOD__ . ": done 304\n" );
 581                                 wfProfileOut( __METHOD__ );
 582
 583                                 return;
 584                         # Try file cache
 585                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 586                                 wfDebug( __METHOD__ . ": done file cache\n" );
 587                                 # tell wgOut that output is taken care of
 588                                 $outputPage->disable();
 589                                 $this->mPage->doViewUpdates( $user );
 590                                 wfProfileOut( __METHOD__ );
 591
 592                                 return;
 593                         }
 594                 }
 595
 596                 # Should the parser cache be used?
 597                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 598                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 599                 if ( $user->getStubThreshold() ) {
 600                         wfIncrStats( 'pcache_miss_stub' );
 601                 }
 602
 603                 $this->showRedirectedFromHeader();
 604                 $this->showNamespaceHeader();
 605
 606                 # Iterate through the possible ways of constructing the output text.
 607                 # Keep going until $outputDone is set, or we run out of things to do.
 608                 $pass = 0;
 609                 $outputDone = false;
 610                 $this->mParserOutput = false;
 611
 612                 while ( !$outputDone && ++$pass ) {
 613                         switch ( $pass ) {
 614                                 case 1:
 615                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 616                                         break;
 617                                 case 2:
 618                                         # Early abort if the page doesn't exist
 619                                         if ( !$this->mPage->exists() ) {
 620                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 621                                                 $this->showMissingArticle();
 622                                                 wfProfileOut( __METHOD__ );
 623                                                 return;
 624                                         }
 625
 626                                         # Try the parser cache
 627                                         if ( $useParserCache ) {
 628                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 629
 630                                                 if ( $this->mParserOutput !== false ) {
 631                                                         if ( $oldid ) {
 632                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 633                                                                 $this->setOldSubtitle( $oldid );
 634                                                         } else {
 635                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 636                                                         }
 637                                                         $outputPage->addParserOutput( $this->mParserOutput );
 638                                                         # Ensure that UI elements requiring revision ID have
 639                                                         # the correct version information.
 640                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 641                                                         # Preload timestamp to avoid a DB hit
 642                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 643                                                         if ( $cachedTimestamp !== null ) {
 644                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 645                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 646                                                         }
 647                                                         $outputDone = true;
 648                                                 }
 649                                         }
 650                                         break;
 651                                 case 3:
 652                                         # This will set $this->mRevision if needed
 653                                         $this->fetchContentObject();
 654
 655                                         # Are we looking at an old revision
 656                                         if ( $oldid && $this->mRevision ) {
 657                                                 $this->setOldSubtitle( $oldid );
 658
 659                                                 if ( !$this->showDeletedRevisionHeader() ) {
 660                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 661                                                         wfProfileOut( __METHOD__ );
 662                                                         return;
 663                                                 }
 664                                         }
 665
 666                                         # Ensure that UI elements requiring revision ID have
 667                                         # the correct version information.
 668                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 669                                         # Preload timestamp to avoid a DB hit
 670                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 671
 672                                         # Pages containing custom CSS or JavaScript get special treatment
 673                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 674                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 675                                                 $this->showCssOrJsPage();
 676                                                 $outputDone = true;
 677                                         } elseif ( !wfRunHooks( 'ArticleContentViewCustom',
 678                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 679
 680                                                 # Allow extensions do their own custom view for certain pages
 681                                                 $outputDone = true;
 682                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 683                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 684
 685                                                 # Allow extensions do their own custom view for certain pages
 686                                                 $outputDone = true;
 687                                         } else {
 688                                                 $content = $this->getContentObject();
 689                                                 $rt = $content ? $content->getRedirectChain() : null;
 690                                                 if ( $rt ) {
 691                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 692                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 693                                                         $outputPage->addHTML( $this->viewRedirect( $rt ) );
 694                                                         # Parse just to get categories, displaytitle, etc.
 695                                                         $this->mParserOutput = $content->getParserOutput( $this->getTitle(), $oldid, $parserOptions, false );
 696                                                         $outputPage->addParserOutputNoText( $this->mParserOutput );
 697                                                         $outputDone = true;
 698                                                 }
 699                                         }
 700                                         break;
 701                                 case 4:
 702                                         # Run the parse, protected by a pool counter
 703                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 704
 705                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 706                                                 $this->getRevIdFetched(), $useParserCache, $this->getContentObject() );
 707
 708                                         if ( !$poolArticleView->execute() ) {
 709                                                 $error = $poolArticleView->getError();
 710                                                 if ( $error ) {
 711                                                         $outputPage->clearHTML(); // for release() errors
 712                                                         $outputPage->enableClientCache( false );
 713                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 714
 715                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 716                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 717                                                 }
 718                                                 # Connection or timeout error
 719                                                 wfProfileOut( __METHOD__ );
 720                                                 return;
 721                                         }
 722
 723                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 724                                         $outputPage->addParserOutput( $this->mParserOutput );
 725
 726                                         # Don't cache a dirty ParserOutput object
 727                                         if ( $poolArticleView->getIsDirty() ) {
 728                                                 $outputPage->setSquidMaxage( 0 );
 729                                                 $outputPage->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
 730                                         }
 731
 732                                         $outputDone = true;
 733                                         break;
 734                                 # Should be unreachable, but just in case...
 735                                 default:
 736                                         break 2;
 737                         }
 738                 }
 739
 740                 # Get the ParserOutput actually *displayed* here.
 741                 # Note that $this->mParserOutput is the *current* version output.
 742                 $pOutput = ( $outputDone instanceof ParserOutput )
 743                         ? $outputDone // object fetched by hook
 744                         : $this->mParserOutput;
 745
 746                 # Adjust title for main page & pages with displaytitle
 747                 if ( $pOutput ) {
 748                         $this->adjustDisplayTitle( $pOutput );
 749                 }
 750
 751                 # For the main page, overwrite the <title> element with the con-
 752                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 753                 # that's not empty).
 754                 # This message always exists because it is in the i18n files
 755                 if ( $this->getTitle()->isMainPage() ) {
 756                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 757                         if ( !$msg->isDisabled() ) {
 758                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 759                         }
 760                 }
 761
 762                 # Check for any __NOINDEX__ tags on the page using $pOutput
 763                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 764                 $outputPage->setIndexPolicy( $policy['index'] );
 765                 $outputPage->setFollowPolicy( $policy['follow'] );
 766
 767                 $this->showViewFooter();
 768                 $this->mPage->doViewUpdates( $user );
 769
 770                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 771
 772                 wfProfileOut( __METHOD__ );
 773         }
 774
 775         /**
 776          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 777          * @param $pOutput ParserOutput
 778          */
 779         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 780                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 781                 $titleText = $pOutput->getTitleText();
 782                 if ( strval( $titleText ) !== '' ) {
 783                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 784                 }
 785         }
 786
 787         /**
 788          * Show a diff page according to current request variables. For use within
 789          * Article::view() only, other callers should use the DifferenceEngine class.
 790          *
 791          * @todo Make protected
 792          */
 793         public function showDiffPage() {
 794                 $request = $this->getContext()->getRequest();
 795                 $user = $this->getContext()->getUser();
 796                 $diff = $request->getVal( 'diff' );
 797                 $rcid = $request->getVal( 'rcid' );
 798                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 799                 $purge = $request->getVal( 'action' ) == 'purge';
 800                 $unhide = $request->getInt( 'unhide' ) == 1;
 801                 $oldid = $this->getOldID();
 802
 803                 $rev = $this->getRevisionFetched();
 804
 805                 if ( !$rev ) {
 806                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 807                         $this->getContext()->getOutput()->addWikiMsg( 'difference-missing-revision', $oldid, 1 );
 808                         return;
 809                 }
 810
 811                 $contentHandler = $rev->getContentHandler();
 812                 $de = $contentHandler->createDifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 813
 814                 // DifferenceEngine directly fetched the revision:
 815                 $this->mRevIdFetched = $de->mNewid;
 816                 $de->showDiffPage( $diffOnly );
 817
 818                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 819                         # Run view updates for current revision only
 820                         $this->mPage->doViewUpdates( $user );
 821                 }
 822         }
 823
 824         /**
 825          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 826          * Article::view() only.
 827          *
 828          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 829          * page views.
 830          *
 831          * @param bool $showCacheHint whether to show a message telling the user to clear the browser cache (default: true).
 832          */
 833         protected function showCssOrJsPage( $showCacheHint = true ) {
 834                 $outputPage = $this->getContext()->getOutput();
 835
 836                 if ( $showCacheHint ) {
 837                         $dir = $this->getContext()->getLanguage()->getDir();
 838                         $lang = $this->getContext()->getLanguage()->getCode();
 839
 840                         $outputPage->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 841                                 'clearyourcache' );
 842                 }
 843
 844                 $this->fetchContentObject();
 845
 846                 if ( $this->mContentObject ) {
 847                         // Give hooks a chance to customise the output
 848                         if ( ContentHandler::runLegacyHooks( 'ShowRawCssJs', array( $this->mContentObject, $this->getTitle(), $outputPage ) ) ) {
 849                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 850                                 $outputPage->addHTML( $po->getText() );
 851                         }
 852                 }
 853         }
 854
 855         /**
 856          * Get the robot policy to be used for the current view
 857          * @param string $action the action= GET parameter
 858          * @param $pOutput ParserOutput|null
 859          * @return Array the policy that should be set
 860          * TODO: actions other than 'view'
 861          */
 862         public function getRobotPolicy( $action, $pOutput = null ) {
 863                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 864
 865                 $ns = $this->getTitle()->getNamespace();
 866
 867                 # Don't index user and user talk pages for blocked users (bug 11443)
 868                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 869                         $specificTarget = null;
 870                         $vagueTarget = null;
 871                         $titleText = $this->getTitle()->getText();
 872                         if ( IP::isValid( $titleText ) ) {
 873                                 $vagueTarget = $titleText;
 874                         } else {
 875                                 $specificTarget = $titleText;
 876                         }
 877                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 878                                 return array(
 879                                         'index' => 'noindex',
 880                                         'follow' => 'nofollow'
 881                                 );
 882                         }
 883                 }
 884
 885                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 886                         # Non-articles (special pages etc), and old revisions
 887                         return array(
 888                                 'index' => 'noindex',
 889                                 'follow' => 'nofollow'
 890                         );
 891                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 892                         # Discourage indexing of printable versions, but encourage following
 893                         return array(
 894                                 'index' => 'noindex',
 895                                 'follow' => 'follow'
 896                         );
 897                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 898                         # For ?curid=x urls, disallow indexing
 899                         return array(
 900                                 'index' => 'noindex',
 901                                 'follow' => 'follow'
 902                         );
 903                 }
 904
 905                 # Otherwise, construct the policy based on the various config variables.
 906                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 907
 908                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 909                         # Honour customised robot policies for this namespace
 910                         $policy = array_merge(
 911                                 $policy,
 912                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 913                         );
 914                 }
 915                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 916                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 917                         # a final sanity check that we have really got the parser output.
 918                         $policy = array_merge(
 919                                 $policy,
 920                                 array( 'index' => $pOutput->getIndexPolicy() )
 921                         );
 922                 }
 923
 924                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 925                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 926                         $policy = array_merge(
 927                                 $policy,
 928                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 929                         );
 930                 }
 931
 932                 return $policy;
 933         }
 934
 935         /**
 936          * Converts a String robot policy into an associative array, to allow
 937          * merging of several policies using array_merge().
 938          * @param $policy Mixed, returns empty array on null/false/'', transparent
 939          *            to already-converted arrays, converts String.
 940          * @return Array: 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 941          */
 942         public static function formatRobotPolicy( $policy ) {
 943                 if ( is_array( $policy ) ) {
 944                         return $policy;
 945                 } elseif ( !$policy ) {
 946                         return array();
 947                 }
 948
 949                 $policy = explode( ',', $policy );
 950                 $policy = array_map( 'trim', $policy );
 951
 952                 $arr = array();
 953                 foreach ( $policy as $var ) {
 954                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 955                                 $arr['index'] = $var;
 956                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 957                                 $arr['follow'] = $var;
 958                         }
 959                 }
 960
 961                 return $arr;
 962         }
 963
 964         /**
 965          * If this request is a redirect view, send "redirected from" subtitle to
 966          * the output. Returns true if the header was needed, false if this is not
 967          * a redirect view. Handles both local and remote redirects.
 968          *
 969          * @return boolean
 970          */
 971         public function showRedirectedFromHeader() {
 972                 global $wgRedirectSources;
 973                 $outputPage = $this->getContext()->getOutput();
 974
 975                 $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 976
 977                 if ( isset( $this->mRedirectedFrom ) ) {
 978                         // This is an internally redirected page view.
 979                         // We'll need a backlink to the source page for navigation.
 980                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 981                                 $redir = Linker::linkKnown(
 982                                         $this->mRedirectedFrom,
 983                                         null,
 984                                         array(),
 985                                         array( 'redirect' => 'no' )
 986                                 );
 987
 988                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 989
 990                                 // Set the fragment if one was specified in the redirect
 991                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 992                                         $outputPage->addInlineScript( Xml::encodeJsCall(
 993                                                 'redirectToFragment', array( $this->getTitle()->getFragmentForURL() )
 994                                         ) );
 995                                 }
 996
 997                                 // Add a <link rel="canonical"> tag
 998                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 999
1000                                 // Tell the output object that the user arrived at this article through a redirect
1001                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1002
1003                                 return true;
1004                         }
1005                 } elseif ( $rdfrom ) {
1006                         // This is an externally redirected view, from some other wiki.
1007                         // If it was reported from a trusted site, supply a backlink.
1008                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1009                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1010                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
1011
1012                                 return true;
1013                         }
1014                 }
1015
1016                 return false;
1017         }
1018
1019         /**
1020          * Show a header specific to the namespace currently being viewed, like
1021          * [[MediaWiki:Talkpagetext]]. For Article::view().
1022          */
1023         public function showNamespaceHeader() {
1024                 if ( $this->getTitle()->isTalkPage() ) {
1025                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1026                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1027                         }
1028                 }
1029         }
1030
1031         /**
1032          * Show the footer section of an ordinary page view
1033          */
1034         public function showViewFooter() {
1035                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1036                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
1037                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1038                 }
1039
1040                 // Show a footer allowing the user to patrol the shown revision or page if possible
1041                 $patrolFooterShown = $this->showPatrolFooter();
1042
1043                 wfRunHooks( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1044
1045         }
1046
1047         /**
1048          * If patrol is possible, output a patrol UI box. This is called from the
1049          * footer section of ordinary page views. If patrol is not possible or not
1050          * desired, does nothing.
1051          * Side effect: When the patrol link is build, this method will call
1052          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1053          *
1054          * @return bool
1055          */
1056         public function showPatrolFooter() {
1057                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1058
1059                 $outputPage = $this->getContext()->getOutput();
1060                 $user = $this->getContext()->getUser();
1061                 $cache = wfGetMainCache();
1062                 $rc = false;
1063
1064                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user ) || !( $wgUseRCPatrol || $wgUseNPPatrol ) ) {
1065                         // Patrolling is disabled or the user isn't allowed to
1066                         return false;
1067                 }
1068
1069                 wfProfileIn( __METHOD__ );
1070
1071                 // New page patrol: Get the timestamp of the oldest revison which
1072                 // the revision table holds for the given page. Then we look
1073                 // whether it's within the RC lifespan and if it is, we try
1074                 // to get the recentchanges row belonging to that entry
1075                 // (with rc_new = 1).
1076
1077                 // Check for cached results
1078                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1079                         wfProfileOut( __METHOD__ );
1080                         return false;
1081                 }
1082
1083                 if ( $this->mRevision && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 ) ) {
1084                         // The current revision is already older than what could be in the RC table
1085                         // 6h tolerance because the RC might not be cleaned out regularly
1086                         wfProfileOut( __METHOD__ );
1087                         return false;
1088                 }
1089
1090                 $dbr = wfGetDB( DB_SLAVE );
1091                 $oldestRevisionTimestamp = $dbr->selectField(
1092                         'revision',
1093                         'MIN( rev_timestamp )',
1094                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1095                         __METHOD__
1096                 );
1097
1098                 if ( $oldestRevisionTimestamp && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 ) ) {
1099                         // 6h tolerance because the RC might not be cleaned out regularly
1100                         $rc = RecentChange::newFromConds(
1101                                 array(
1102                                         'rc_new' => 1,
1103                                         'rc_timestamp' => $oldestRevisionTimestamp,
1104                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1105                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1106                                         'rc_patrolled' => 0
1107                                 ),
1108                                 __METHOD__,
1109                                 array( 'USE INDEX' => 'new_name_timestamp' )
1110                         );
1111                 }
1112
1113                 if ( !$rc ) {
1114                         // No RC entry around
1115
1116                         // Cache the information we gathered above in case we can't patrol
1117                         // Don't cache in case we can patrol as this could change
1118                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1119
1120                         wfProfileOut( __METHOD__ );
1121                         return false;
1122                 }
1123
1124                 $rcid = $rc->getAttribute( 'rc_id' );
1125
1126                 $token = $user->getEditToken( $rcid );
1127
1128                 $outputPage->preventClickjacking();
1129                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1130                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1131                 }
1132
1133                 $link = Linker::linkKnown(
1134                         $this->getTitle(),
1135                         wfMessage( 'markaspatrolledtext' )->escaped(),
1136                         array(),
1137                         array(
1138                                 'action' => 'markpatrolled',
1139                                 'rcid' => $rcid,
1140                                 'token' => $token,
1141                         )
1142                 );
1143
1144                 $outputPage->addHTML(
1145                         "<div class='patrollink'>" .
1146                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1147                         '</div>'
1148                 );
1149
1150                 wfProfileOut( __METHOD__ );
1151                 return true;
1152         }
1153
1154         /**
1155          * Show the error text for a missing article. For articles in the MediaWiki
1156          * namespace, show the default message text. To be called from Article::view().
1157          */
1158         public function showMissingArticle() {
1159                 global $wgSend404Code;
1160                 $outputPage = $this->getContext()->getOutput();
1161                 // Whether the page is a root user page of an existing user (but not a subpage)
1162                 $validUserPage = false;
1163
1164                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1165                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
1166                         $parts = explode( '/', $this->getTitle()->getText() );
1167                         $rootPart = $parts[0];
1168                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1169                         $ip = User::isIP( $rootPart );
1170
1171                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1172                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1173                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1174                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1175                                 LogEventsList::showLogExtract(
1176                                         $outputPage,
1177                                         'block',
1178                                         $user->getUserPage(),
1179                                         '',
1180                                         array(
1181                                                 'lim' => 1,
1182                                                 'showIfEmpty' => false,
1183                                                 'msgKey' => array(
1184                                                         'blocked-notice-logextract',
1185                                                         $user->getName() # Support GENDER in notice
1186                                                 )
1187                                         )
1188                                 );
1189                                 $validUserPage = !$this->getTitle()->isSubpage();
1190                         } else {
1191                                 $validUserPage = !$this->getTitle()->isSubpage();
1192                         }
1193                 }
1194
1195                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1196
1197                 # Show delete and move logs
1198                 LogEventsList::showLogExtract( $outputPage, array( 'delete', 'move' ), $this->getTitle(), '',
1199                         array( 'lim' => 10,
1200                                 'conds' => array( "log_action != 'revision'" ),
1201                                 'showIfEmpty' => false,
1202                                 'msgKey' => array( 'moveddeleted-notice' ) )
1203                 );
1204
1205                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1206                         // If there's no backing content, send a 404 Not Found
1207                         // for better machine handling of broken links.
1208                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1209                 }
1210
1211                 if ( $validUserPage ) {
1212                         // Also apply the robot policy for nonexisting user pages (as those aren't served as 404)
1213                         $policy = $this->getRobotPolicy( 'view' );
1214                         $outputPage->setIndexPolicy( $policy['index'] );
1215                         $outputPage->setFollowPolicy( $policy['follow'] );
1216                 }
1217
1218                 $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
1219
1220                 if ( ! $hookResult ) {
1221                         return;
1222                 }
1223
1224                 # Show error message
1225                 $oldid = $this->getOldID();
1226                 if ( $oldid ) {
1227                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1228                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
1229                         // Use the default message text
1230                         $text = $this->getTitle()->getDefaultMessageText();
1231                 } elseif ( $this->getTitle()->quickUserCan( 'create', $this->getContext()->getUser() )
1232                         && $this->getTitle()->quickUserCan( 'edit', $this->getContext()->getUser() )
1233                 ) {
1234                         $text = wfMessage( 'noarticletext' )->plain();
1235                 } else {
1236                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1237                 }
1238                 $text = "<div class='noarticletext'>\n$text\n</div>";
1239
1240                 $outputPage->addWikiText( $text );
1241         }
1242
1243         /**
1244          * If the revision requested for view is deleted, check permissions.
1245          * Send either an error message or a warning header to the output.
1246          *
1247          * @return boolean true if the view is allowed, false if not.
1248          */
1249         public function showDeletedRevisionHeader() {
1250                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1251                         // Not deleted
1252                         return true;
1253                 }
1254
1255                 $outputPage = $this->getContext()->getOutput();
1256                 $user = $this->getContext()->getUser();
1257                 // If the user is not allowed to see it...
1258                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1259                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1260                                 'rev-deleted-text-permission' );
1261
1262                         return false;
1263                 // If the user needs to confirm that they want to see it...
1264                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1265                         # Give explanation and add a link to view the revision...
1266                         $oldid = intval( $this->getOldID() );
1267                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1268                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1269                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1270                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1271                                 array( $msg, $link ) );
1272
1273                         return false;
1274                 // We are allowed to see...
1275                 } else {
1276                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1277                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1278                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1279
1280                         return true;
1281                 }
1282         }
1283
1284         /**
1285          * Generate the navigation links when browsing through an article revisions
1286          * It shows the information as:
1287          *   Revision as of \<date\>; view current revision
1288          *   \<- Previous version | Next Version -\>
1289          *
1290          * @param int $oldid revision ID of this article revision
1291          */
1292         public function setOldSubtitle( $oldid = 0 ) {
1293                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1294                         return;
1295                 }
1296
1297                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1298
1299                 # Cascade unhide param in links for easy deletion browsing
1300                 $extraParams = array();
1301                 if ( $unhide ) {
1302                         $extraParams['unhide'] = 1;
1303                 }
1304
1305                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1306                         $revision = $this->mRevision;
1307                 } else {
1308                         $revision = Revision::newFromId( $oldid );
1309                 }
1310
1311                 $timestamp = $revision->getTimestamp();
1312
1313                 $current = ( $oldid == $this->mPage->getLatest() );
1314                 $language = $this->getContext()->getLanguage();
1315                 $user = $this->getContext()->getUser();
1316
1317                 $td = $language->userTimeAndDate( $timestamp, $user );
1318                 $tddate = $language->userDate( $timestamp, $user );
1319                 $tdtime = $language->userTime( $timestamp, $user );
1320
1321                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1322                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1323
1324                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1325                         ? 'revision-info-current'
1326                         : 'revision-info';
1327
1328                 $outputPage = $this->getContext()->getOutput();
1329                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1330                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1331                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1332
1333                 $lnk = $current
1334                         ? wfMessage( 'currentrevisionlink' )->escaped()
1335                         : Linker::linkKnown(
1336                                 $this->getTitle(),
1337                                 wfMessage( 'currentrevisionlink' )->escaped(),
1338                                 array(),
1339                                 $extraParams
1340                         );
1341                 $curdiff = $current
1342                         ? wfMessage( 'diff' )->escaped()
1343                         : Linker::linkKnown(
1344                                 $this->getTitle(),
1345                                 wfMessage( 'diff' )->escaped(),
1346                                 array(),
1347                                 array(
1348                                         'diff' => 'cur',
1349                                         'oldid' => $oldid
1350                                 ) + $extraParams
1351                         );
1352                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1353                 $prevlink = $prev
1354                         ? Linker::linkKnown(
1355                                 $this->getTitle(),
1356                                 wfMessage( 'previousrevision' )->escaped(),
1357                                 array(),
1358                                 array(
1359                                         'direction' => 'prev',
1360                                         'oldid' => $oldid
1361                                 ) + $extraParams
1362                         )
1363                         : wfMessage( 'previousrevision' )->escaped();
1364                 $prevdiff = $prev
1365                         ? Linker::linkKnown(
1366                                 $this->getTitle(),
1367                                 wfMessage( 'diff' )->escaped(),
1368                                 array(),
1369                                 array(
1370                                         'diff' => 'prev',
1371                                         'oldid' => $oldid
1372                                 ) + $extraParams
1373                         )
1374                         : wfMessage( 'diff' )->escaped();
1375                 $nextlink = $current
1376                         ? wfMessage( 'nextrevision' )->escaped()
1377                         : Linker::linkKnown(
1378                                 $this->getTitle(),
1379                                 wfMessage( 'nextrevision' )->escaped(),
1380                                 array(),
1381                                 array(
1382                                         'direction' => 'next',
1383                                         'oldid' => $oldid
1384                                 ) + $extraParams
1385                         );
1386                 $nextdiff = $current
1387                         ? wfMessage( 'diff' )->escaped()
1388                         : Linker::linkKnown(
1389                                 $this->getTitle(),
1390                                 wfMessage( 'diff' )->escaped(),
1391                                 array(),
1392                                 array(
1393                                         'diff' => 'next',
1394                                         'oldid' => $oldid
1395                                 ) + $extraParams
1396                         );
1397
1398                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1399                 if ( $cdel !== '' ) {
1400                         $cdel .= ' ';
1401                 }
1402
1403                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1404                         wfMessage( 'revision-nav' )->rawParams(
1405                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1406                         )->escaped() . "</div>" );
1407         }
1408
1409         /**
1410          * View redirect
1411          *
1412          * @param $target Title|Array of destination(s) to redirect
1413          * @param $appendSubtitle Boolean [optional]
1414          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1415          * @return string containing HMTL with redirect link
1416          */
1417         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1418                 global $wgStylePath;
1419
1420                 if ( !is_array( $target ) ) {
1421                         $target = array( $target );
1422                 }
1423
1424                 $lang = $this->getTitle()->getPageLanguage();
1425                 $imageDir = $lang->getDir();
1426
1427                 if ( $appendSubtitle ) {
1428                         $out = $this->getContext()->getOutput();
1429                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->escaped() );
1430                 }
1431
1432                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1433
1434                 /**
1435                  * @var $title Title
1436                  */
1437                 $title = array_shift( $target );
1438
1439                 if ( $forceKnown ) {
1440                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1441                 } else {
1442                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1443                 }
1444
1445                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1446                 $alt = $lang->isRTL() ? '←' : '→';
1447                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1448                 foreach ( $target as $rt ) {
1449                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1450                         if ( $forceKnown ) {
1451                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1452                         } else {
1453                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1454                         }
1455                 }
1456
1457                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1458                 return '<div class="redirectMsg">' .
1459                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1460                         '<span class="redirectText">' . $link . '</span></div>';
1461         }
1462
1463         /**
1464          * Handle action=render
1465          */
1466         public function render() {
1467                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1468                 $this->view();
1469         }
1470
1471         /**
1472          * action=protect handler
1473          */
1474         public function protect() {
1475                 $form = new ProtectionForm( $this );
1476                 $form->execute();
1477         }
1478
1479         /**
1480          * action=unprotect handler (alias)
1481          */
1482         public function unprotect() {
1483                 $this->protect();
1484         }
1485
1486         /**
1487          * UI entry point for page deletion
1488          */
1489         public function delete() {
1490                 # This code desperately needs to be totally rewritten
1491
1492                 $title = $this->getTitle();
1493                 $user = $this->getContext()->getUser();
1494
1495                 # Check permissions
1496                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1497                 if ( count( $permission_errors ) ) {
1498                         throw new PermissionsError( 'delete', $permission_errors );
1499                 }
1500
1501                 # Read-only check...
1502                 if ( wfReadOnly() ) {
1503                         throw new ReadOnlyError;
1504                 }
1505
1506                 # Better double-check that it hasn't been deleted yet!
1507                 $this->mPage->loadPageData( 'fromdbmaster' );
1508                 if ( !$this->mPage->exists() ) {
1509                         $deleteLogPage = new LogPage( 'delete' );
1510                         $outputPage = $this->getContext()->getOutput();
1511                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1512                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1513                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1514                                 );
1515                         $outputPage->addHTML(
1516                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1517                         );
1518                         LogEventsList::showLogExtract(
1519                                 $outputPage,
1520                                 'delete',
1521                                 $title
1522                         );
1523
1524                         return;
1525                 }
1526
1527                 $request = $this->getContext()->getRequest();
1528                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1529                 $deleteReason = $request->getText( 'wpReason' );
1530
1531                 if ( $deleteReasonList == 'other' ) {
1532                         $reason = $deleteReason;
1533                 } elseif ( $deleteReason != '' ) {
1534                         // Entry from drop down menu + additional comment
1535                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1536                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1537                 } else {
1538                         $reason = $deleteReasonList;
1539                 }
1540
1541                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1542                         array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
1543                 {
1544                         # Flag to hide all contents of the archived revisions
1545                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1546
1547                         $this->doDelete( $reason, $suppress );
1548
1549                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1550
1551                         return;
1552                 }
1553
1554                 // Generate deletion reason
1555                 $hasHistory = false;
1556                 if ( !$reason ) {
1557                         try {
1558                                 $reason = $this->generateReason( $hasHistory );
1559                         } catch ( MWException $e ) {
1560                                 # if a page is horribly broken, we still want to be able to delete it. so be lenient about errors here.
1561                                 wfDebug( "Error while building auto delete summary: $e" );
1562                                 $reason = '';
1563                         }
1564                 }
1565
1566                 // If the page has a history, insert a warning
1567                 if ( $hasHistory ) {
1568                         $revisions = $this->mTitle->estimateRevisionCount();
1569                         // @todo FIXME: i18n issue/patchwork message
1570                         $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
1571                                 wfMessage( 'historywarning' )->numParams( $revisions )->parse() .
1572                                 wfMessage( 'word-separator' )->plain() . Linker::linkKnown( $title,
1573                                         wfMessage( 'history' )->escaped(),
1574                                         array( 'rel' => 'archives' ),
1575                                         array( 'action' => 'history' ) ) .
1576                                 '</strong>'
1577                         );
1578
1579                         if ( $this->mTitle->isBigDeletion() ) {
1580                                 global $wgDeleteRevisionsLimit;
1581                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1582                                         array( 'delete-warning-toobig', $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit ) ) );
1583                         }
1584                 }
1585
1586                 $this->confirmDelete( $reason );
1587         }
1588
1589         /**
1590          * Output deletion confirmation dialog
1591          * @todo FIXME: Move to another file?
1592          * @param string $reason prefilled reason
1593          */
1594         public function confirmDelete( $reason ) {
1595                 wfDebug( "Article::confirmDelete\n" );
1596
1597                 $outputPage = $this->getContext()->getOutput();
1598                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1599                 $outputPage->addBacklinkSubtitle( $this->getTitle() );
1600                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1601                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1602
1603                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1604
1605                 $user = $this->getContext()->getUser();
1606
1607                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1608                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1609                                         <td></td>
1610                                         <td class='mw-input'><strong>" .
1611                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1612                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1613                                         "</strong></td>
1614                                 </tr>";
1615                 } else {
1616                         $suppress = '';
1617                 }
1618                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $this->getTitle() );
1619
1620                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1621                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1622                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1623                         Xml::tags( 'legend', null, wfMessage( 'delete-legend' )->escaped() ) .
1624                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1625                         "<tr id=\"wpDeleteReasonListRow\">
1626                                 <td class='mw-label'>" .
1627                                         Xml::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1628                                 "</td>
1629                                 <td class='mw-input'>" .
1630                                         Xml::listDropDown( 'wpDeleteReasonList',
1631                                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1632                                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(), '', 'wpReasonDropDown', 1 ) .
1633                                 "</td>
1634                         </tr>
1635                         <tr id=\"wpDeleteReasonRow\">
1636                                 <td class='mw-label'>" .
1637                                         Xml::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1638                                 "</td>
1639                                 <td class='mw-input'>" .
1640                                 Html::input( 'wpReason', $reason, 'text', array(
1641                                         'size' => '60',
1642                                         'maxlength' => '255',
1643                                         'tabindex' => '2',
1644                                         'id' => 'wpReason',
1645                                         'autofocus'
1646                                 ) ) .
1647                                 "</td>
1648                         </tr>";
1649
1650                 # Disallow watching if user is not logged in
1651                 if ( $user->isLoggedIn() ) {
1652                         $form .= "
1653                         <tr>
1654                                 <td></td>
1655                                 <td class='mw-input'>" .
1656                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1657                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1658                                 "</td>
1659                         </tr>";
1660                 }
1661
1662                 $form .= "
1663                         $suppress
1664                         <tr>
1665                                 <td></td>
1666                                 <td class='mw-submit'>" .
1667                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1668                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1669                                 "</td>
1670                         </tr>" .
1671                         Xml::closeElement( 'table' ) .
1672                         Xml::closeElement( 'fieldset' ) .
1673                         Html::hidden( 'wpEditToken', $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1674                         Xml::closeElement( 'form' );
1675
1676                         if ( $user->isAllowed( 'editinterface' ) ) {
1677                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1678                                 $link = Linker::link(
1679                                         $title,
1680                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1681                                         array(),
1682                                         array( 'action' => 'edit' )
1683                                 );
1684                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1685                         }
1686
1687                 $outputPage->addHTML( $form );
1688
1689                 $deleteLogPage = new LogPage( 'delete' );
1690                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1691                 LogEventsList::showLogExtract( $outputPage, 'delete',
1692                         $this->getTitle()
1693                 );
1694         }
1695
1696         /**
1697          * Perform a deletion and output success or failure messages
1698          * @param $reason
1699          * @param $suppress bool
1700          */
1701         public function doDelete( $reason, $suppress = false ) {
1702                 $error = '';
1703                 $outputPage = $this->getContext()->getOutput();
1704                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1705                 if ( $status->isGood() ) {
1706                         $deleted = $this->getTitle()->getPrefixedText();
1707
1708                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1709                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1710
1711                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1712
1713                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1714                         $outputPage->returnToMain( false );
1715                 } else {
1716                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1717                         if ( $error == '' ) {
1718                                 $outputPage->addWikiText(
1719                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1720                                 );
1721                                 $deleteLogPage = new LogPage( 'delete' );
1722                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1723
1724                                 LogEventsList::showLogExtract(
1725                                         $outputPage,
1726                                         'delete',
1727                                         $this->getTitle()
1728                                 );
1729                         } else {
1730                                 $outputPage->addHTML( $error );
1731                         }
1732                 }
1733         }
1734
1735         /* Caching functions */
1736
1737         /**
1738          * checkLastModified returns true if it has taken care of all
1739          * output to the client that is necessary for this request.
1740          * (that is, it has sent a cached version of the page)
1741          *
1742          * @return boolean true if cached version send, false otherwise
1743          */
1744         protected function tryFileCache() {
1745                 static $called = false;
1746
1747                 if ( $called ) {
1748                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1749                         return false;
1750                 }
1751
1752                 $called = true;
1753                 if ( $this->isFileCacheable() ) {
1754                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1755                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1756                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1757                                 $cache->loadFromFileCache( $this->getContext() );
1758                                 return true;
1759                         } else {
1760                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1761                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1762                         }
1763                 } else {
1764                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1765                 }
1766
1767                 return false;
1768         }
1769
1770         /**
1771          * Check if the page can be cached
1772          * @return bool
1773          */
1774         public function isFileCacheable() {
1775                 $cacheable = false;
1776
1777                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1778                         $cacheable = $this->mPage->getID()
1779                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1780                         // Extension may have reason to disable file caching on some pages.
1781                         if ( $cacheable ) {
1782                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1783                         }
1784                 }
1785
1786                 return $cacheable;
1787         }
1788
1789         /**#@-*/
1790
1791         /**
1792          * Lightweight method to get the parser output for a page, checking the parser cache
1793          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1794          * consider, so it's not appropriate to use there.
1795          *
1796          * @since 1.16 (r52326) for LiquidThreads
1797          *
1798          * @param $oldid mixed integer Revision ID or null
1799          * @param $user User The relevant user
1800          * @return ParserOutput or false if the given revision ID is not found
1801          */
1802         public function getParserOutput( $oldid = null, User $user = null ) {
1803                 //XXX: bypasses mParserOptions and thus setParserOptions()
1804
1805                 if ( $user === null ) {
1806                         $parserOptions = $this->getParserOptions();
1807                 } else {
1808                         $parserOptions = $this->mPage->makeParserOptions( $user );
1809                 }
1810
1811                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1812         }
1813
1814         /**
1815          * Override the ParserOptions used to render the primary article wikitext.
1816          *
1817          * @param ParserOptions $options
1818          * @throws MWException if the parser options where already initialized.
1819          */
1820         public function setParserOptions( ParserOptions $options ) {
1821                 if ( $this->mParserOptions ) {
1822                         throw new MWException( "can't change parser options after they have already been set" );
1823                 }
1824
1825                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1826                 $this->mParserOptions = clone $options;
1827         }
1828
1829         /**
1830          * Get parser options suitable for rendering the primary article wikitext
1831          * @return ParserOptions
1832          */
1833         public function getParserOptions() {
1834                 if ( !$this->mParserOptions ) {
1835                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1836                 }
1837                 // Clone to allow modifications of the return value without affecting cache
1838                 return clone $this->mParserOptions;
1839         }
1840
1841         /**
1842          * Sets the context this Article is executed in
1843          *
1844          * @param $context IContextSource
1845          * @since 1.18
1846          */
1847         public function setContext( $context ) {
1848                 $this->mContext = $context;
1849         }
1850
1851         /**
1852          * Gets the context this Article is executed in
1853          *
1854          * @return IContextSource
1855          * @since 1.18
1856          */
1857         public function getContext() {
1858                 if ( $this->mContext instanceof IContextSource ) {
1859                         return $this->mContext;
1860                 } else {
1861                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1862                         return RequestContext::getMain();
1863                 }
1864         }
1865
1866         /**
1867          * Info about this page
1868          * @deprecated since 1.19
1869          */
1870         public function info() {
1871                 wfDeprecated( __METHOD__, '1.19' );
1872                 Action::factory( 'info', $this )->show();
1873         }
1874
1875         /**
1876          * Mark this particular edit/page as patrolled
1877          * @deprecated since 1.18
1878          */
1879         public function markpatrolled() {
1880                 wfDeprecated( __METHOD__, '1.18' );
1881                 Action::factory( 'markpatrolled', $this )->show();
1882         }
1883
1884         /**
1885          * Handle action=purge
1886          * @deprecated since 1.19
1887          * @return Action|bool|null false if the action is disabled, null if it is not recognised
1888          */
1889         public function purge() {
1890                 return Action::factory( 'purge', $this )->show();
1891         }
1892
1893         /**
1894          * Handle action=revert
1895          * @deprecated since 1.19
1896          */
1897         public function revert() {
1898                 wfDeprecated( __METHOD__, '1.19' );
1899                 Action::factory( 'revert', $this )->show();
1900         }
1901
1902         /**
1903          * Handle action=rollback
1904          * @deprecated since 1.19
1905          */
1906         public function rollback() {
1907                 wfDeprecated( __METHOD__, '1.19' );
1908                 Action::factory( 'rollback', $this )->show();
1909         }
1910
1911         /**
1912          * User-interface handler for the "watch" action.
1913          * Requires Request to pass a token as of 1.18.
1914          * @deprecated since 1.18
1915          */
1916         public function watch() {
1917                 wfDeprecated( __METHOD__, '1.18' );
1918                 Action::factory( 'watch', $this )->show();
1919         }
1920
1921         /**
1922          * Add this page to the current user's watchlist
1923          *
1924          * This is safe to be called multiple times
1925          *
1926          * @return bool true on successful watch operation
1927          * @deprecated since 1.18
1928          */
1929         public function doWatch() {
1930                 wfDeprecated( __METHOD__, '1.18' );
1931                 return WatchAction::doWatch( $this->getTitle(), $this->getContext()->getUser() );
1932         }
1933
1934         /**
1935          * User interface handler for the "unwatch" action.
1936          * Requires Request to pass a token as of 1.18.
1937          * @deprecated since 1.18
1938          */
1939         public function unwatch() {
1940                 wfDeprecated( __METHOD__, '1.18' );
1941                 Action::factory( 'unwatch', $this )->show();
1942         }
1943
1944         /**
1945          * Stop watching a page
1946          * @return bool true on successful unwatch
1947          * @deprecated since 1.18
1948          */
1949         public function doUnwatch() {
1950                 wfDeprecated( __METHOD__, '1.18' );
1951                 return WatchAction::doUnwatch( $this->getTitle(), $this->getContext()->getUser() );
1952         }
1953
1954         /**
1955          * Output a redirect back to the article.
1956          * This is typically used after an edit.
1957          *
1958          * @deprecated in 1.18; call OutputPage::redirect() directly
1959          * @param $noRedir Boolean: add redirect=no
1960          * @param string $sectionAnchor section to redirect to, including "#"
1961          * @param string $extraQuery extra query params
1962          */
1963         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1964                 wfDeprecated( __METHOD__, '1.18' );
1965                 if ( $noRedir ) {
1966                         $query = 'redirect=no';
1967                         if ( $extraQuery ) {
1968                                 $query .= "&$extraQuery";
1969                         }
1970                 } else {
1971                         $query = $extraQuery;
1972                 }
1973
1974                 $this->getContext()->getOutput()->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1975         }
1976
1977         /**
1978          * Use PHP's magic __get handler to handle accessing of
1979          * raw WikiPage fields for backwards compatibility.
1980          *
1981          * @param string $fname Field name
1982          */
1983         public function __get( $fname ) {
1984                 if ( property_exists( $this->mPage, $fname ) ) {
1985                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1986                         return $this->mPage->$fname;
1987                 }
1988                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1989         }
1990
1991         /**
1992          * Use PHP's magic __set handler to handle setting of
1993          * raw WikiPage fields for backwards compatibility.
1994          *
1995          * @param string $fname Field name
1996          * @param $fvalue mixed New value
1997          */
1998         public function __set( $fname, $fvalue ) {
1999                 if ( property_exists( $this->mPage, $fname ) ) {
2000                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
2001                         $this->mPage->$fname = $fvalue;
2002                 // Note: extensions may want to toss on new fields
2003                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
2004                         $this->mPage->$fname = $fvalue;
2005                 } else {
2006                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2007                 }
2008         }
2009
2010         /**
2011          * Use PHP's magic __call handler to transform instance calls to
2012          * WikiPage functions for backwards compatibility.
2013          *
2014          * @param string $fname Name of called method
2015          * @param array $args Arguments to the method
2016          * @return mixed
2017          */
2018         public function __call( $fname, $args ) {
2019                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2020                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2021                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2022                 }
2023                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2024         }
2025
2026         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2027
2028         /**
2029          * @param $limit array
2030          * @param $expiry array
2031          * @param $cascade bool
2032          * @param $reason string
2033          * @param $user User
2034          * @return Status
2035          */
2036         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2037                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2038         }
2039
2040         /**
2041          * @param $limit array
2042          * @param $reason string
2043          * @param $cascade int
2044          * @param $expiry array
2045          * @return bool
2046          */
2047         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2048                 return $this->mPage->doUpdateRestrictions(
2049                         $limit,
2050                         $expiry,
2051                         $cascade,
2052                         $reason,
2053                         $this->getContext()->getUser()
2054                 );
2055         }
2056
2057         /**
2058          * @param $reason string
2059          * @param $suppress bool
2060          * @param $id int
2061          * @param $commit bool
2062          * @param $error string
2063          * @return bool
2064          */
2065         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2066                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2067         }
2068
2069         /**
2070          * @param $fromP
2071          * @param $summary
2072          * @param $token
2073          * @param $bot
2074          * @param $resultDetails
2075          * @param $user User
2076          * @return array
2077          */
2078         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2079                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2080                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2081         }
2082
2083         /**
2084          * @param $fromP
2085          * @param $summary
2086          * @param $bot
2087          * @param $resultDetails
2088          * @param $guser User
2089          * @return array
2090          */
2091         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2092                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2093                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2094         }
2095
2096         /**
2097          * @param $hasHistory bool
2098          * @return mixed
2099          */
2100         public function generateReason( &$hasHistory ) {
2101                 $title = $this->mPage->getTitle();
2102                 $handler = ContentHandler::getForTitle( $title );
2103                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2104         }
2105
2106         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2107
2108         /**
2109          * @return array
2110          */
2111         public static function selectFields() {
2112                 return WikiPage::selectFields();
2113         }
2114
2115         /**
2116          * @param $title Title
2117          */
2118         public static function onArticleCreate( $title ) {
2119                 WikiPage::onArticleCreate( $title );
2120         }
2121
2122         /**
2123          * @param $title Title
2124          */
2125         public static function onArticleDelete( $title ) {
2126                 WikiPage::onArticleDelete( $title );
2127         }
2128
2129         /**
2130          * @param $title Title
2131          */
2132         public static function onArticleEdit( $title ) {
2133                 WikiPage::onArticleEdit( $title );
2134         }
2135
2136         /**
2137          * @param $oldtext
2138          * @param $newtext
2139          * @param $flags
2140          * @return string
2141          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2142          */
2143         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2144                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2145         }
2146         // ******
2147 }