includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         // doDeleteArticleReal() return values. Values less than zero indicate fatal errors,
  17         // values greater than zero indicate that there were problems not resulting in page
  18         // not being deleted
  19
  20         /**
  21          * Delete operation aborted by hook
  22          */
  23         const DELETE_HOOK_ABORTED = -1;
  24
  25         /**
  26          * Deletion successful
  27          */
  28         const DELETE_SUCCESS = 0;
  29
  30         /**
  31          * Page not found
  32          */
  33         const DELETE_NO_PAGE = 1;
  34
  35         /**
  36          * No revisions found to delete
  37          */
  38         const DELETE_NO_REVISIONS = 2;
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         public $mPreparedEdit = false;       // !< Array
  52         /**@}}*/
  53
  54         /**
  55          * @var Title
  56          */
  57         protected $mRedirectTarget = null;
  58
  59         /**
  60          * @var Revision
  61          */
  62         protected $mLastRevision = null;
  63
  64         /**
  65          * @var string; timestamp of the current revision or empty string if not loaded
  66          */
  67         protected $mTimestamp = '';
  68
  69         /**
  70          * @var string
  71          */
  72         protected $mTouched = '19700101000000';
  73
  74         /**
  75          * @var int|null
  76          */
  77         protected $mCounter = null;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param $title Title Reference to a Title object.
  82          */
  83         public function __construct( Title $title ) {
  84                 $this->mTitle = $title;
  85         }
  86
  87         /**
  88          * Create a WikiPage object of the appropriate class for the given title.
  89          *
  90          * @param $title Title
  91          * @return WikiPage object of the appropriate type
  92          */
  93         public static function factory( Title $title ) {
  94                 $ns = $title->getNamespace();
  95
  96                 if ( $ns == NS_MEDIA ) {
  97                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  98                 } elseif ( $ns < 0 ) {
  99                         throw new MWException( "Invalid or virtual namespace $ns given." );
 100                 }
 101
 102                 switch ( $ns ) {
 103                         case NS_FILE:
 104                                 $page = new WikiFilePage( $title );
 105                                 break;
 106                         case NS_CATEGORY:
 107                                 $page = new WikiCategoryPage( $title );
 108                                 break;
 109                         default:
 110                                 $page = new WikiPage( $title );
 111                 }
 112
 113                 return $page;
 114         }
 115
 116         /**
 117          * Constructor from a page id
 118          *
 119          * @param $id Int article ID to load
 120          *
 121          * @return WikiPage|null
 122          */
 123         public static function newFromID( $id ) {
 124                 $t = Title::newFromID( $id );
 125                 if ( $t ) {
 126                         return self::factory( $t );
 127                 }
 128                 return null;
 129         }
 130
 131         /**
 132          * Returns overrides for action handlers.
 133          * Classes listed here will be used instead of the default one when
 134          * (and only when) $wgActions[$action] === true. This allows subclasses
 135          * to override the default behavior.
 136          *
 137          * @todo: move this UI stuff somewhere else
 138          *
 139          * @return Array
 140          */
 141         public function getActionOverrides() {
 142         $content_handler = $this->getContentHandler();
 143                 return $content_handler->getActionOverrides();
 144         }
 145
 146     /**
 147      * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 148      *
 149      * Shorthand for ContentHandler::getForModelName( $this->getContentModelName() );
 150      *
 151      * @return ContentHandler
 152      *
 153      * @since 1.WD
 154      */
 155     public function getContentHandler() {
 156         return ContentHandler::getForModelName( $this->getContentModelName() );
 157     }
 158
 159         /**
 160          * Get the title object of the article
 161          * @return Title object of this page
 162          */
 163         public function getTitle() {
 164                 return $this->mTitle;
 165         }
 166
 167         /**
 168          * Clear the object
 169          */
 170         public function clear() {
 171                 $this->mDataLoaded = false;
 172
 173                 $this->mCounter = null;
 174                 $this->mRedirectTarget = null; # Title object if set
 175                 $this->mLastRevision = null; # Latest revision
 176                 $this->mTouched = '19700101000000';
 177                 $this->mTimestamp = '';
 178                 $this->mIsRedirect = false;
 179                 $this->mLatest = false;
 180                 $this->mPreparedEdit = false;
 181         }
 182
 183         /**
 184          * Return the list of revision fields that should be selected to create
 185          * a new page.
 186          *
 187          * @return array
 188          */
 189         public static function selectFields() {
 190                 return array(
 191                         'page_id',
 192                         'page_namespace',
 193                         'page_title',
 194                         'page_restrictions',
 195                         'page_counter',
 196                         'page_is_redirect',
 197                         'page_is_new',
 198                         'page_random',
 199                         'page_touched',
 200                         'page_latest',
 201                         'page_len',
 202             'page_content_model',
 203                 );
 204         }
 205
 206         /**
 207          * Fetch a page record with the given conditions
 208          * @param $dbr DatabaseBase object
 209          * @param $conditions Array
 210          * @return mixed Database result resource, or false on failure
 211          */
 212         protected function pageData( $dbr, $conditions ) {
 213                 $fields = self::selectFields();
 214
 215                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 216
 217                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 218
 219                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 220
 221                 return $row;
 222         }
 223
 224         /**
 225          * Fetch a page record matching the Title object's namespace and title
 226          * using a sanitized title string
 227          *
 228          * @param $dbr DatabaseBase object
 229          * @param $title Title object
 230          * @return mixed Database result resource, or false on failure
 231          */
 232         public function pageDataFromTitle( $dbr, $title ) {
 233                 return $this->pageData( $dbr, array(
 234                         'page_namespace' => $title->getNamespace(),
 235                         'page_title'     => $title->getDBkey() ) );
 236         }
 237
 238         /**
 239          * Fetch a page record matching the requested ID
 240          *
 241          * @param $dbr DatabaseBase
 242          * @param $id Integer
 243          * @return mixed Database result resource, or false on failure
 244          */
 245         public function pageDataFromId( $dbr, $id ) {
 246                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 247         }
 248
 249         /**
 250          * Set the general counter, title etc data loaded from
 251          * some source.
 252          *
 253          * @param $data Object|String One of the following:
 254          *              A DB query result object or...
 255          *              "fromdb" to get from a slave DB or...
 256          *              "fromdbmaster" to get from the master DB
 257          * @return void
 258          */
 259         public function loadPageData( $data = 'fromdb' ) {
 260                 if ( $data === 'fromdbmaster' ) {
 261                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 262                 } elseif ( $data === 'fromdb' ) { // slave
 263                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 264                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 265                         # Note that DB also stores the master position in the session and checks it.
 266                         $touched = $this->getCachedLastEditTime();
 267                         if ( $touched ) { // key set
 268                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 269                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 270                                 }
 271                         }
 272                 }
 273
 274                 $lc = LinkCache::singleton();
 275
 276                 if ( $data ) {
 277                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 278
 279                         $this->mTitle->loadFromRow( $data );
 280
 281                         # Old-fashioned restrictions
 282                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 283
 284                         $this->mCounter     = intval( $data->page_counter );
 285                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 286                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 287                         $this->mLatest      = intval( $data->page_latest );
 288                 } else {
 289                         $lc->addBadLinkObj( $this->mTitle );
 290
 291                         $this->mTitle->loadFromRow( false );
 292                 }
 293
 294                 $this->mDataLoaded = true;
 295         }
 296
 297         /**
 298          * @return int Page ID
 299          */
 300         public function getId() {
 301                 return $this->mTitle->getArticleID();
 302         }
 303
 304         /**
 305          * @return bool Whether or not the page exists in the database
 306          */
 307         public function exists() {
 308                 return $this->mTitle->exists();
 309         }
 310
 311         /**
 312          * Check if this page is something we're going to be showing
 313          * some sort of sensible content for. If we return false, page
 314          * views (plain action=view) will return an HTTP 404 response,
 315          * so spiders and robots can know they're following a bad link.
 316          *
 317          * @return bool
 318          */
 319         public function hasViewableContent() {
 320                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 321         }
 322
 323         /**
 324          * @return int The view count for the page
 325          */
 326         public function getCount() {
 327                 if ( !$this->mDataLoaded ) {
 328                         $this->loadPageData();
 329                 }
 330
 331                 return $this->mCounter;
 332         }
 333
 334         /**
 335          * Tests if the article text represents a redirect
 336          *
 337          * @param $text mixed string containing article contents, or boolean
 338          * @return bool
 339          */
 340         public function isRedirect( $text = false ) {
 341         if ( $text === false ) $content = $this->getContent();
 342         else $content = ContentHandler::makeContent( $text, $this->mTitle ); # TODO: allow model and format to be provided; or better, expect a Content object
 343
 344
 345         if ( empty( $content ) ) return false;
 346         else return $content->isRedirect();
 347         }
 348
 349     /**
 350      * Returns the page's content model name. Will use the revisions actual content model if the page exists,
 351      * and the page's default if the page doesn't exist yet.
 352      *
 353      * @return int
 354      *
 355      * @since 1.WD
 356      */
 357     public function getContentModelName() {
 358         if ( $this->exists() ) {
 359             # look at the revision's actual content model
 360             $rev = $this->getRevision();
 361             return $rev->getContentModelName();
 362         } else {
 363             # use the default model for this page
 364             return $this->mTitle->getContentModelName();
 365         }
 366     }
 367
 368         /**
 369          * Loads page_touched and returns a value indicating if it should be used
 370          * @return boolean true if not a redirect
 371          */
 372         public function checkTouched() {
 373                 if ( !$this->mDataLoaded ) {
 374                         $this->loadPageData();
 375                 }
 376                 return !$this->mIsRedirect;
 377         }
 378
 379         /**
 380          * Get the page_touched field
 381          * @return string containing GMT timestamp
 382          */
 383         public function getTouched() {
 384                 if ( !$this->mDataLoaded ) {
 385                         $this->loadPageData();
 386                 }
 387                 return $this->mTouched;
 388         }
 389
 390         /**
 391          * Get the page_latest field
 392          * @return integer rev_id of current revision
 393          */
 394         public function getLatest() {
 395                 if ( !$this->mDataLoaded ) {
 396                         $this->loadPageData();
 397                 }
 398                 return (int)$this->mLatest;
 399         }
 400
 401         /**
 402          * Loads everything except the text
 403          * This isn't necessary for all uses, so it's only done if needed.
 404          */
 405         protected function loadLastEdit() {
 406                 if ( $this->mLastRevision !== null ) {
 407                         return; // already loaded
 408                 }
 409
 410                 $latest = $this->getLatest();
 411                 if ( !$latest ) {
 412                         return; // page doesn't exist or is missing page_latest info
 413                 }
 414
 415                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 416                 if ( $revision ) { // sanity
 417                         $this->setLastEdit( $revision );
 418                 }
 419         }
 420
 421         /**
 422          * Set the latest revision
 423          */
 424         protected function setLastEdit( Revision $revision ) {
 425                 $this->mLastRevision = $revision;
 426                 $this->mTimestamp = $revision->getTimestamp();
 427         }
 428
 429         /**
 430          * Get the latest revision
 431          * @return Revision|null
 432          */
 433         public function getRevision() {
 434                 $this->loadLastEdit();
 435                 if ( $this->mLastRevision ) {
 436                         return $this->mLastRevision;
 437                 }
 438                 return null;
 439         }
 440
 441     /**
 442      * Get the content of the current revision. No side-effects...
 443      *
 444      * @param $audience Integer: one of:
 445      *      Revision::FOR_PUBLIC       to be displayed to all users
 446      *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 447      *      Revision::RAW              get the text regardless of permissions
 448      * @return Content|null The content of the current revision
 449      *
 450      * @since 1.WD
 451      */
 452     public function getContent( $audience = Revision::FOR_PUBLIC ) {
 453         $this->loadLastEdit();
 454         if ( $this->mLastRevision ) {
 455             return $this->mLastRevision->getContent( $audience );
 456         }
 457         return null;
 458     }
 459
 460         /**
 461          * Get the text of the current revision. No side-effects...
 462          *
 463          * @param $audience Integer: one of:
 464          *      Revision::FOR_PUBLIC       to be displayed to all users
 465          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 466          *      Revision::RAW              get the text regardless of permissions
 467          * @return String|false The text of the current revision
 468      * @deprecated as of 1.WD, getContent() should be used instead.
 469          */
 470         public function getText( $audience = Revision::FOR_PUBLIC ) { #@todo: deprecated, replace usage!
 471         wfDeprecated( __METHOD__, '1.WD' );
 472
 473                 $this->loadLastEdit();
 474                 if ( $this->mLastRevision ) {
 475                         return $this->mLastRevision->getText( $audience );
 476                 }
 477                 return false;
 478         }
 479
 480         /**
 481          * Get the text of the current revision. No side-effects...
 482          *
 483          * @return String|bool The text of the current revision. False on failure
 484          * @deprecated as of 1.WD, getContent() should be used instead.
 485          */
 486         public function getRawText() { #@todo: deprecated, replace usage!
 487                 wfDeprecated( __METHOD__, '1.WD' );
 488
 489                 return $this->getText( Revision::RAW );
 490         }
 491
 492         /**
 493          * @return string MW timestamp of last article revision
 494          */
 495         public function getTimestamp() {
 496                 // Check if the field has been filled by WikiPage::setTimestamp()
 497                 if ( !$this->mTimestamp ) {
 498                         $this->loadLastEdit();
 499                 }
 500
 501                 return wfTimestamp( TS_MW, $this->mTimestamp );
 502         }
 503
 504         /**
 505          * Set the page timestamp (use only to avoid DB queries)
 506          * @param $ts string MW timestamp of last article revision
 507          * @return void
 508          */
 509         public function setTimestamp( $ts ) {
 510                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 511         }
 512
 513         /**
 514          * @param $audience Integer: one of:
 515          *      Revision::FOR_PUBLIC       to be displayed to all users
 516          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 517          *      Revision::RAW              get the text regardless of permissions
 518          * @return int user ID for the user that made the last article revision
 519          */
 520         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 521                 $this->loadLastEdit();
 522                 if ( $this->mLastRevision ) {
 523                         return $this->mLastRevision->getUser( $audience );
 524                 } else {
 525                         return -1;
 526                 }
 527         }
 528
 529         /**
 530          * @param $audience Integer: one of:
 531          *      Revision::FOR_PUBLIC       to be displayed to all users
 532          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 533          *      Revision::RAW              get the text regardless of permissions
 534          * @return string username of the user that made the last article revision
 535          */
 536         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 537                 $this->loadLastEdit();
 538                 if ( $this->mLastRevision ) {
 539                         return $this->mLastRevision->getUserText( $audience );
 540                 } else {
 541                         return '';
 542                 }
 543         }
 544
 545         /**
 546          * @param $audience Integer: one of:
 547          *      Revision::FOR_PUBLIC       to be displayed to all users
 548          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 549          *      Revision::RAW              get the text regardless of permissions
 550          * @return string Comment stored for the last article revision
 551          */
 552         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 553                 $this->loadLastEdit();
 554                 if ( $this->mLastRevision ) {
 555                         return $this->mLastRevision->getComment( $audience );
 556                 } else {
 557                         return '';
 558                 }
 559         }
 560
 561         /**
 562          * Returns true if last revision was marked as "minor edit"
 563          *
 564          * @return boolean Minor edit indicator for the last article revision.
 565          */
 566         public function getMinorEdit() {
 567                 $this->loadLastEdit();
 568                 if ( $this->mLastRevision ) {
 569                         return $this->mLastRevision->isMinor();
 570                 } else {
 571                         return false;
 572                 }
 573         }
 574
 575         /**
 576          * Get the cached timestamp for the last time the page changed.
 577          * This is only used to help handle slave lag by comparing to page_touched.
 578          * @return string MW timestamp
 579          */
 580         protected function getCachedLastEditTime() {
 581                 global $wgMemc;
 582                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 583                 return $wgMemc->get( $key );
 584         }
 585
 586         /**
 587          * Set the cached timestamp for the last time the page changed.
 588          * This is only used to help handle slave lag by comparing to page_touched.
 589          * @param $timestamp string
 590          * @return void
 591          */
 592         public function setCachedLastEditTime( $timestamp ) {
 593                 global $wgMemc;
 594                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 595                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 596         }
 597
 598         /**
 599          * Determine whether a page would be suitable for being counted as an
 600          * article in the site_stats table based on the title & its content
 601          *
 602          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 603          *        if false, the current database state will be used
 604          * @return Boolean
 605          */
 606         public function isCountable( $editInfo = false ) {
 607                 global $wgArticleCountMethod;
 608
 609                 if ( !$this->mTitle->isContentPage() ) {
 610                         return false;
 611                 }
 612
 613         if ( $editInfo ) {
 614             $content = $editInfo->pstContent;
 615         } else {
 616             $content = $this->getContent();
 617         }
 618
 619                 if ( !$content || $content->isRedirect( ) ) {
 620                         return false;
 621                 }
 622
 623         $hasLinks = null;
 624
 625         if ( $wgArticleCountMethod === 'link' ) {
 626             # nasty special case to avoid re-parsing to detect links
 627
 628             if ( $editInfo ) {
 629                 // ParserOutput::getLinks() is a 2D array of page links, so
 630                 // to be really correct we would need to recurse in the array
 631                 // but the main array should only have items in it if there are
 632                 // links.
 633                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 634             } else {
 635                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 636                     array( 'pl_from' => $this->getId() ), __METHOD__ );
 637             }
 638         }
 639
 640                 return $content->isCountable( $hasLinks );
 641         }
 642
 643         /**
 644          * If this page is a redirect, get its target
 645          *
 646          * The target will be fetched from the redirect table if possible.
 647          * If this page doesn't have an entry there, call insertRedirect()
 648          * @return Title|mixed object, or null if this page is not a redirect
 649          */
 650         public function getRedirectTarget() {
 651                 if ( !$this->mTitle->isRedirect() ) {
 652                         return null;
 653                 }
 654
 655                 if ( $this->mRedirectTarget !== null ) {
 656                         return $this->mRedirectTarget;
 657                 }
 658
 659                 # Query the redirect table
 660                 $dbr = wfGetDB( DB_SLAVE );
 661                 $row = $dbr->selectRow( 'redirect',
 662                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 663                         array( 'rd_from' => $this->getId() ),
 664                         __METHOD__
 665                 );
 666
 667                 // rd_fragment and rd_interwiki were added later, populate them if empty
 668                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 669                         return $this->mRedirectTarget = Title::makeTitle(
 670                                 $row->rd_namespace, $row->rd_title,
 671                                 $row->rd_fragment, $row->rd_interwiki );
 672                 }
 673
 674                 # This page doesn't have an entry in the redirect table
 675                 return $this->mRedirectTarget = $this->insertRedirect();
 676         }
 677
 678         /**
 679          * Insert an entry for this page into the redirect table.
 680          *
 681          * Don't call this function directly unless you know what you're doing.
 682          * @return Title object or null if not a redirect
 683          */
 684         public function insertRedirect() {
 685                 // recurse through to only get the final target
 686         $content = $this->getContent();
 687                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 688                 if ( !$retval ) {
 689                         return null;
 690                 }
 691                 $this->insertRedirectEntry( $retval );
 692                 return $retval;
 693         }
 694
 695         /**
 696          * Insert or update the redirect table entry for this page to indicate
 697          * it redirects to $rt .
 698          * @param $rt Title redirect target
 699          */
 700         public function insertRedirectEntry( $rt ) {
 701                 $dbw = wfGetDB( DB_MASTER );
 702                 $dbw->replace( 'redirect', array( 'rd_from' ),
 703                         array(
 704                                 'rd_from'      => $this->getId(),
 705                                 'rd_namespace' => $rt->getNamespace(),
 706                                 'rd_title'     => $rt->getDBkey(),
 707                                 'rd_fragment'  => $rt->getFragment(),
 708                                 'rd_interwiki' => $rt->getInterwiki(),
 709                         ),
 710                         __METHOD__
 711                 );
 712         }
 713
 714         /**
 715          * Get the Title object or URL this page redirects to
 716          *
 717          * @return mixed false, Title of in-wiki target, or string with URL
 718          */
 719         public function followRedirect() {
 720                 return $this->getRedirectURL( $this->getRedirectTarget() );
 721         }
 722
 723         /**
 724          * Get the Title object or URL to use for a redirect. We use Title
 725          * objects for same-wiki, non-special redirects and URLs for everything
 726          * else.
 727          * @param $rt Title Redirect target
 728          * @return mixed false, Title object of local target, or string with URL
 729          */
 730         public function getRedirectURL( $rt ) {
 731                 if ( !$rt ) {
 732                         return false;
 733                 }
 734
 735                 if ( $rt->isExternal() ) {
 736                         if ( $rt->isLocal() ) {
 737                                 // Offsite wikis need an HTTP redirect.
 738                                 //
 739                                 // This can be hard to reverse and may produce loops,
 740                                 // so they may be disabled in the site configuration.
 741                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 742                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 743                         } else {
 744                                 // External pages pages without "local" bit set are not valid
 745                                 // redirect targets
 746                                 return false;
 747                         }
 748                 }
 749
 750                 if ( $rt->isSpecialPage() ) {
 751                         // Gotta handle redirects to special pages differently:
 752                         // Fill the HTTP response "Location" header and ignore
 753                         // the rest of the page we're on.
 754                         //
 755                         // Some pages are not valid targets
 756                         if ( $rt->isValidRedirectTarget() ) {
 757                                 return $rt->getFullURL();
 758                         } else {
 759                                 return false;
 760                         }
 761                 }
 762
 763                 return $rt;
 764         }
 765
 766         /**
 767          * Get a list of users who have edited this article, not including the user who made
 768          * the most recent revision, which you can get from $article->getUser() if you want it
 769          * @return UserArrayFromResult
 770          */
 771         public function getContributors() {
 772                 # @todo FIXME: This is expensive; cache this info somewhere.
 773
 774                 $dbr = wfGetDB( DB_SLAVE );
 775
 776                 if ( $dbr->implicitGroupby() ) {
 777                         $realNameField = 'user_real_name';
 778                 } else {
 779                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 780                 }
 781
 782                 $tables = array( 'revision', 'user' );
 783
 784                 $fields = array(
 785                         'rev_user as user_id',
 786                         'rev_user_text AS user_name',
 787                         $realNameField,
 788                         'MAX(rev_timestamp) AS timestamp',
 789                 );
 790
 791                 $conds = array( 'rev_page' => $this->getId() );
 792
 793                 // The user who made the top revision gets credited as "this page was last edited by
 794                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 795                 $user = $this->getUser();
 796                 if ( $user ) {
 797                         $conds[] = "rev_user != $user";
 798                 } else {
 799                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 800                 }
 801
 802                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 803
 804                 $jconds = array(
 805                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 806                 );
 807
 808                 $options = array(
 809                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 810                         'ORDER BY' => 'timestamp DESC',
 811                 );
 812
 813                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 814                 return new UserArrayFromResult( $res );
 815         }
 816
 817         /**
 818          * Get the last N authors
 819          * @param $num Integer: number of revisions to get
 820          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 821          * @return array Array of authors, duplicates not removed
 822          */
 823         public function getLastNAuthors( $num, $revLatest = 0 ) {
 824                 wfProfileIn( __METHOD__ );
 825                 // First try the slave
 826                 // If that doesn't have the latest revision, try the master
 827                 $continue = 2;
 828                 $db = wfGetDB( DB_SLAVE );
 829
 830                 do {
 831                         $res = $db->select( array( 'page', 'revision' ),
 832                                 array( 'rev_id', 'rev_user_text' ),
 833                                 array(
 834                                         'page_namespace' => $this->mTitle->getNamespace(),
 835                                         'page_title' => $this->mTitle->getDBkey(),
 836                                         'rev_page = page_id'
 837                                 ), __METHOD__,
 838                                 array(
 839                                         'ORDER BY' => 'rev_timestamp DESC',
 840                                         'LIMIT' => $num
 841                                 )
 842                         );
 843
 844                         if ( !$res ) {
 845                                 wfProfileOut( __METHOD__ );
 846                                 return array();
 847                         }
 848
 849                         $row = $db->fetchObject( $res );
 850
 851                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 852                                 $db = wfGetDB( DB_MASTER );
 853                                 $continue--;
 854                         } else {
 855                                 $continue = 0;
 856                         }
 857                 } while ( $continue );
 858
 859                 $authors = array( $row->rev_user_text );
 860
 861                 foreach ( $res as $row ) {
 862                         $authors[] = $row->rev_user_text;
 863                 }
 864
 865                 wfProfileOut( __METHOD__ );
 866                 return $authors;
 867         }
 868
 869         /**
 870          * Should the parser cache be used?
 871          *
 872          * @param $parserOptions ParserOptions to check
 873          * @param $oldid int
 874          * @return boolean
 875          */
 876         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 877                 global $wgEnableParserCache;
 878
 879                 return $wgEnableParserCache
 880                         && $parserOptions->getStubThreshold() == 0
 881                         && $this->mTitle->exists()
 882                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 883                         && $this->getContentHandler()->isParserCacheSupported();
 884         }
 885
 886         /**
 887          * Get a ParserOutput for the given ParserOptions and revision ID.
 888          * The parser cache will be used if possible.
 889          *
 890          * @since 1.19
 891          * @param $parserOptions ParserOptions to use for the parse operation
 892          * @param $oldid Revision ID to get the text from, passing null or 0 will
 893          *               get the current revision (default value)
 894          * @param $context IContextSource context for parsing
 895          *
 896          * @return ParserOutput or false if the revision was not found
 897          */
 898         public function getParserOutput( ParserOptions $parserOptions, $oldid = null, IContextSource $context = null ) {
 899                 wfProfileIn( __METHOD__ );
 900
 901                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 902                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 903                 if ( $parserOptions->getStubThreshold() ) {
 904                         wfIncrStats( 'pcache_miss_stub' );
 905                 }
 906
 907                 if ( $useParserCache ) {
 908                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 909                         if ( $parserOutput !== false ) {
 910                                 wfProfileOut( __METHOD__ );
 911                                 return $parserOutput;
 912                         }
 913                 }
 914
 915                 if ( $oldid === null || $oldid === 0 ) {
 916                         $oldid = $this->getLatest();
 917                 }
 918
 919                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache, null, $context );
 920                 $pool->execute();
 921
 922                 wfProfileOut( __METHOD__ );
 923
 924                 return $pool->getParserOutput();
 925         }
 926
 927         /**
 928          * Do standard deferred updates after page view
 929          * @param $user User The relevant user
 930          */
 931         public function doViewUpdates( User $user ) {
 932                 global $wgDisableCounters;
 933                 if ( wfReadOnly() ) {
 934                         return;
 935                 }
 936
 937                 # Don't update page view counters on views from bot users (bug 14044)
 938                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 939                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 940                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 941                 }
 942
 943                 # Update newtalk / watchlist notification status
 944                 $user->clearNotification( $this->mTitle );
 945         }
 946
 947         /**
 948          * Perform the actions of a page purging
 949          * @return bool
 950          */
 951         public function doPurge() {
 952                 global $wgUseSquid;
 953
 954                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 955                         return false;
 956                 }
 957
 958                 // Invalidate the cache
 959                 $this->mTitle->invalidateCache();
 960                 $this->clear();
 961
 962                 if ( $wgUseSquid ) {
 963                         // Commit the transaction before the purge is sent
 964                         $dbw = wfGetDB( DB_MASTER );
 965                         $dbw->commit( __METHOD__ );
 966
 967                         // Send purge
 968                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 969                         $update->doUpdate();
 970                 }
 971
 972                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 973                         if ( $this->mTitle->exists() ) {
 974                                 $text = ContentHandler::getContentText( $this->getNativeData() );
 975                         } else {
 976                                 $text = false;
 977                         }
 978
 979                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 980                 }
 981                 return true;
 982         }
 983
 984         /**
 985          * Insert a new empty page record for this article.
 986          * This *must* be followed up by creating a revision
 987          * and running $this->updateRevisionOn( ... );
 988          * or else the record will be left in a funky state.
 989          * Best if all done inside a transaction.
 990          *
 991          * @param $dbw DatabaseBase
 992          * @return int The newly created page_id key, or false if the title already existed
 993          */
 994         public function insertOn( $dbw ) {
 995                 wfProfileIn( __METHOD__ );
 996
 997                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 998                 $dbw->insert( 'page', array(
 999                         'page_id'           => $page_id,
1000                         'page_namespace'    => $this->mTitle->getNamespace(),
1001                         'page_title'        => $this->mTitle->getDBkey(),
1002                         'page_counter'      => 0,
1003                         'page_restrictions' => '',
1004                         'page_is_redirect'  => 0, # Will set this shortly...
1005                         'page_is_new'       => 1,
1006                         'page_random'       => wfRandom(),
1007                         'page_touched'      => $dbw->timestamp(),
1008                         'page_latest'       => 0, # Fill this in shortly...
1009                         'page_len'          => 0, # Fill this in shortly...
1010                 ), __METHOD__, 'IGNORE' );
1011
1012                 $affected = $dbw->affectedRows();
1013
1014                 if ( $affected ) {
1015                         $newid = $dbw->insertId();
1016                         $this->mTitle->resetArticleID( $newid );
1017                 }
1018                 wfProfileOut( __METHOD__ );
1019
1020                 return $affected ? $newid : false;
1021         }
1022
1023         /**
1024          * Update the page record to point to a newly saved revision.
1025          *
1026          * @param $dbw DatabaseBase: object
1027          * @param $revision Revision: For ID number, and text used to set
1028          *                  length and redirect status fields
1029          * @param $lastRevision Integer: if given, will not overwrite the page field
1030          *                      when different from the currently set value.
1031          *                      Giving 0 indicates the new page flag should be set
1032          *                      on.
1033          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1034          *                           removing rows in redirect table.
1035          * @return bool true on success, false on failure
1036          * @private
1037          */
1038         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1039                 wfProfileIn( __METHOD__ );
1040
1041         $content = $revision->getContent();
1042                 $len = $content->getSize();
1043                 $rt = $content->getUltimateRedirectTarget();
1044
1045                 $conditions = array( 'page_id' => $this->getId() );
1046
1047                 if ( !is_null( $lastRevision ) ) {
1048                         # An extra check against threads stepping on each other
1049                         $conditions['page_latest'] = $lastRevision;
1050                 }
1051
1052                 $now = wfTimestampNow();
1053                 $dbw->update( 'page',
1054                         array( /* SET */
1055                                 'page_latest'      => $revision->getId(),
1056                                 'page_touched'     => $dbw->timestamp( $now ),
1057                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1058                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1059                                 'page_len'         => $len,
1060                                 'page_content_model' => $revision->getContentModelName(),
1061                         ),
1062                         $conditions,
1063                         __METHOD__ );
1064
1065                 $result = $dbw->affectedRows() != 0;
1066                 if ( $result ) {
1067                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1068                         $this->setLastEdit( $revision );
1069                         $this->setCachedLastEditTime( $now );
1070                         $this->mLatest = $revision->getId();
1071                         $this->mIsRedirect = (bool)$rt;
1072                         # Update the LinkCache.
1073                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1074                 }
1075
1076                 wfProfileOut( __METHOD__ );
1077                 return $result;
1078         }
1079
1080         /**
1081          * Add row to the redirect table if this is a redirect, remove otherwise.
1082          *
1083          * @param $dbw DatabaseBase
1084          * @param $redirectTitle Title object pointing to the redirect target,
1085          *                       or NULL if this is not a redirect
1086          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1087          *                           removing rows in redirect table.
1088          * @return bool true on success, false on failure
1089          * @private
1090          */
1091         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1092                 // Always update redirects (target link might have changed)
1093                 // Update/Insert if we don't know if the last revision was a redirect or not
1094                 // Delete if changing from redirect to non-redirect
1095                 $isRedirect = !is_null( $redirectTitle );
1096
1097                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1098                         return true;
1099                 }
1100
1101                 wfProfileIn( __METHOD__ );
1102                 if ( $isRedirect ) {
1103                         $this->insertRedirectEntry( $redirectTitle );
1104                 } else {
1105                         // This is not a redirect, remove row from redirect table
1106                         $where = array( 'rd_from' => $this->getId() );
1107                         $dbw->delete( 'redirect', $where, __METHOD__ );
1108                 }
1109
1110                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1111                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1112                 }
1113                 wfProfileOut( __METHOD__ );
1114
1115                 return ( $dbw->affectedRows() != 0 );
1116         }
1117
1118         /**
1119          * If the given revision is newer than the currently set page_latest,
1120          * update the page record. Otherwise, do nothing.
1121          *
1122          * @param $dbw DatabaseBase object
1123          * @param $revision Revision object
1124          * @return mixed
1125          */
1126         public function updateIfNewerOn( $dbw, $revision ) {
1127                 wfProfileIn( __METHOD__ );
1128
1129                 $row = $dbw->selectRow(
1130                         array( 'revision', 'page' ),
1131                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1132                         array(
1133                                 'page_id' => $this->getId(),
1134                                 'page_latest=rev_id' ),
1135                         __METHOD__ );
1136
1137                 if ( $row ) {
1138                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1139                                 wfProfileOut( __METHOD__ );
1140                                 return false;
1141                         }
1142                         $prev = $row->rev_id;
1143                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1144                 } else {
1145                         # No or missing previous revision; mark the page as new
1146                         $prev = 0;
1147                         $lastRevIsRedirect = null;
1148                 }
1149
1150                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1151
1152                 wfProfileOut( __METHOD__ );
1153                 return $ret;
1154         }
1155
1156         /**
1157          * Get the text that needs to be saved in order to undo all revisions
1158          * between $undo and $undoafter. Revisions must belong to the same page,
1159          * must exist and must not be deleted
1160          * @param $undo Revision
1161          * @param $undoafter Revision Must be an earlier revision than $undo
1162          * @return mixed string on success, false on failure
1163          * @deprecated since 1.WD: use ContentHandler::getUndoContent() instead.
1164          */
1165         public function getUndoText( Revision $undo, Revision $undoafter = null ) { #FIXME: replace usages.
1166                 wfDeprecated( __METHOD__, '1.WD' );
1167
1168                 $this->loadLastEdit();
1169
1170                 if ( $this->mLastRevision ) {
1171                         if ( is_null( $undoafter ) ) {
1172                                 $undoafter = $undo->getPrevious();
1173                         }
1174
1175                         $handler = $this->getContentHandler();
1176                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1177
1178                         if ( !$undone ) {
1179                                 return false;
1180                         } else {
1181                                 return ContentHandler::getContentText( $undone );
1182                         }
1183                 }
1184
1185                 return false;
1186         }
1187
1188         /**
1189          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1190          * @param $text String: new text of the section
1191          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1192          * @param $edittime String: revision timestamp or null to use the current revision
1193          * @return String new complete article text, or null if error
1194          *
1195          * @deprecated since 1.WD, use replaceSectionContent() instead
1196          */
1197         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) { #FIXME: use replaceSectionContent() instead!
1198         wfDeprecated( __METHOD__, '1.WD' );
1199
1200         $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() ); #XXX: could make section title, but that's not required.
1201
1202         $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1203
1204                 return ContentHandler::getContentText( $newContent ); #XXX: unclear what will happen for non-wikitext!
1205         }
1206
1207         /**
1208          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1209          * @param $content Content: new content of the section
1210          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1211          * @param $edittime String: revision timestamp or null to use the current revision
1212          *
1213          * @return Content new complete article content, or null if error
1214          *
1215          * @since 1.WD
1216          */
1217     public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1218         wfProfileIn( __METHOD__ );
1219
1220         if ( strval( $section ) == '' ) {
1221             // Whole-page edit; let the whole text through
1222             $newContent = $sectionContent;
1223         } else {
1224             // Bug 30711: always use current version when adding a new section
1225             if ( is_null( $edittime ) || $section == 'new' ) {
1226                 $oldContent = $this->getContent();
1227                 if ( ! $oldContent ) {
1228                     wfDebug( __METHOD__ . ": no page text\n" );
1229                     wfProfileOut( __METHOD__ );
1230                     return null;
1231                 }
1232             } else {
1233                 $dbw = wfGetDB( DB_MASTER );
1234                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1235
1236                 if ( !$rev ) {
1237                     wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1238                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1239                     wfProfileOut( __METHOD__ );
1240                     return null;
1241                 }
1242
1243                 $oldContent = $rev->getContent();
1244             }
1245
1246             $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1247         }
1248
1249         wfProfileOut( __METHOD__ );
1250         return $newContent;
1251     }
1252
1253         /**
1254          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1255          * @param $flags Int
1256          * @return Int updated $flags
1257          */
1258         function checkFlags( $flags ) {
1259                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1260                         if ( $this->mTitle->getArticleID() ) {
1261                                 $flags |= EDIT_UPDATE;
1262                         } else {
1263                                 $flags |= EDIT_NEW;
1264                         }
1265                 }
1266
1267                 return $flags;
1268         }
1269
1270         /**
1271          * Change an existing article or create a new article. Updates RC and all necessary caches,
1272          * optionally via the deferred update array.
1273          *
1274          * @param $text String: new text
1275          * @param $summary String: edit summary
1276          * @param $flags Integer bitfield:
1277          *      EDIT_NEW
1278          *          Article is known or assumed to be non-existent, create a new one
1279          *      EDIT_UPDATE
1280          *          Article is known or assumed to be pre-existing, update it
1281          *      EDIT_MINOR
1282          *          Mark this edit minor, if the user is allowed to do so
1283          *      EDIT_SUPPRESS_RC
1284          *          Do not log the change in recentchanges
1285          *      EDIT_FORCE_BOT
1286          *          Mark the edit a "bot" edit regardless of user rights
1287          *      EDIT_DEFER_UPDATES
1288          *          Defer some of the updates until the end of index.php
1289          *      EDIT_AUTOSUMMARY
1290          *          Fill in blank summaries with generated text where possible
1291          *
1292          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1293          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1294          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1295          * edit-already-exists error will be returned. These two conditions are also possible with
1296          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1297          *
1298          * @param $baseRevId int the revision ID this edit was based off, if any
1299          * @param $user User the user doing the edit
1300          *
1301          * @return Status object. Possible errors:
1302          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1303          *     edit-gone-missing:       In update mode, but the article didn't exist
1304          *     edit-conflict:           In update mode, the article changed unexpectedly
1305          *     edit-no-change:          Warning that the text was the same as before
1306          *     edit-already-exists:     In creation mode, but the article already exists
1307          *
1308          *  Extensions may define additional errors.
1309          *
1310          *  $return->value will contain an associative array with members as follows:
1311          *     new:                     Boolean indicating if the function attempted to create a new article
1312          *     revision:                The revision object for the inserted revision, or null
1313          *
1314          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1315          *
1316          * @deprecated since 1.WD: use doEditContent() instead.
1317          */
1318     public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #FIXME: use doEditContent() instead
1319         wfDeprecated( __METHOD__, '1.WD' );
1320
1321         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1322
1323         return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1324     }
1325
1326     /**
1327      * Change an existing article or create a new article. Updates RC and all necessary caches,
1328      * optionally via the deferred update array.
1329      *
1330      * @param $content Content: new content
1331      * @param $summary String: edit summary
1332      * @param $flags Integer bitfield:
1333      *      EDIT_NEW
1334      *          Article is known or assumed to be non-existent, create a new one
1335      *      EDIT_UPDATE
1336      *          Article is known or assumed to be pre-existing, update it
1337      *      EDIT_MINOR
1338      *          Mark this edit minor, if the user is allowed to do so
1339      *      EDIT_SUPPRESS_RC
1340      *          Do not log the change in recentchanges
1341      *      EDIT_FORCE_BOT
1342      *          Mark the edit a "bot" edit regardless of user rights
1343      *      EDIT_DEFER_UPDATES
1344      *          Defer some of the updates until the end of index.php
1345      *      EDIT_AUTOSUMMARY
1346      *          Fill in blank summaries with generated text where possible
1347      *
1348      * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1349      * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1350      * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1351      * edit-already-exists error will be returned. These two conditions are also possible with
1352      * auto-detection due to MediaWiki's performance-optimised locking strategy.
1353      *
1354      * @param $baseRevId the revision ID this edit was based off, if any
1355      * @param $user User the user doing the edit
1356      * @param $serialisation_format String: format for storing the content in the database
1357      *
1358      * @return Status object. Possible errors:
1359      *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1360      *     edit-gone-missing:       In update mode, but the article didn't exist
1361      *     edit-conflict:           In update mode, the article changed unexpectedly
1362      *     edit-no-change:          Warning that the text was the same as before
1363      *     edit-already-exists:     In creation mode, but the article already exists
1364      *
1365      *  Extensions may define additional errors.
1366      *
1367      *  $return->value will contain an associative array with members as follows:
1368      *     new:                     Boolean indicating if the function attempted to create a new article
1369      *     revision:                The revision object for the inserted revision, or null
1370      *
1371      * @since 1.WD
1372      */
1373         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1374                                    User $user = null, $serialisation_format = null ) { #FIXME: use this
1375                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1376
1377                 # Low-level sanity check
1378                 if ( $this->mTitle->getText() === '' ) {
1379                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1380                 }
1381
1382                 wfProfileIn( __METHOD__ );
1383
1384                 $user = is_null( $user ) ? $wgUser : $user;
1385                 $status = Status::newGood( array() );
1386
1387                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1388                 $this->loadPageData( 'fromdbmaster' );
1389
1390                 $flags = $this->checkFlags( $flags );
1391
1392         # call legacy hook
1393         $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary, #FIXME: document new hook!
1394             $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1395
1396         if ( $hook_ok && !empty( $wgHooks['ArticleSave'] ) ) { # avoid serialization overhead if the hook isn't present
1397             $content_text = $content->serialize();
1398             $txt = $content_text; # clone
1399
1400             $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary, #FIXME: deprecate legacy hook!
1401                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1402
1403             if ( $txt !== $content_text ) {
1404                 # if the text changed, unserialize the new version to create an updated Content object.
1405                 $content = $content->getContentHandler()->unserializeContent( $txt );
1406             }
1407         }
1408
1409                 if ( !$hook_ok ) {
1410                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1411
1412                         if ( $status->isOK() ) {
1413                                 $status->fatal( 'edit-hook-aborted' );
1414                         }
1415
1416                         wfProfileOut( __METHOD__ );
1417                         return $status;
1418                 }
1419
1420                 # Silently ignore EDIT_MINOR if not allowed
1421                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1422                 $bot = $flags & EDIT_FORCE_BOT;
1423
1424                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1425
1426                 $oldsize = $old_content ? $old_content->getSize() : 0;
1427                 $oldid = $this->getLatest();
1428                 $oldIsRedirect = $this->isRedirect();
1429                 $oldcountable = $this->isCountable();
1430
1431         $handler = $content->getContentHandler();
1432
1433                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1434                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1435             if ( !$old_content ) $old_content = null;
1436                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1437                 }
1438
1439                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1440                 $serialized = $editInfo->pst;
1441         $content = $editInfo->pstContent;
1442                 $newsize =  $content->getSize();
1443
1444                 $dbw = wfGetDB( DB_MASTER );
1445                 $now = wfTimestampNow();
1446                 $this->mTimestamp = $now;
1447
1448                 if ( $flags & EDIT_UPDATE ) {
1449                         # Update article, but only if changed.
1450                         $status->value['new'] = false;
1451
1452                         if ( !$oldid ) {
1453                                 # Article gone missing
1454                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1455                                 $status->fatal( 'edit-gone-missing' );
1456
1457                                 wfProfileOut( __METHOD__ );
1458                                 return $status;
1459                         }
1460
1461                         # Make sure the revision is either completely inserted or not inserted at all
1462                         if ( !$wgDBtransactions ) {
1463                                 $userAbort = ignore_user_abort( true );
1464                         }
1465
1466                         $revision = new Revision( array(
1467                                 'page'       => $this->getId(),
1468                                 'comment'    => $summary,
1469                                 'minor_edit' => $isminor,
1470                                 'text'       => $serialized,
1471                 'len'        => $newsize,
1472                                 'parent_id'  => $oldid,
1473                                 'user'       => $user->getId(),
1474                                 'user_text'  => $user->getName(),
1475                                 'timestamp'  => $now,
1476                 'content_model' => $content->getModelName(),
1477                 'content_format' => $serialisation_format,
1478                         ) );
1479
1480                         $changed = !$content->equals( $old_content );
1481
1482                         if ( $changed ) {
1483                                 $dbw->begin( __METHOD__ );
1484                                 $revisionId = $revision->insertOn( $dbw );
1485
1486                                 # Update page
1487                                 #
1488                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1489                                 # during the course of this function. This makes sure that EditPage can detect
1490                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1491                                 # before this function is called. A previous function used a separate query, this
1492                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1493                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1494
1495                                 if ( !$ok ) {
1496                                         /* Belated edit conflict! Run away!! */
1497                                         $status->fatal( 'edit-conflict' );
1498
1499                                         # Delete the invalid revision if the DB is not transactional
1500                                         if ( !$wgDBtransactions ) {
1501                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1502                                         }
1503
1504                                         $revisionId = 0;
1505                                         $dbw->rollback( __METHOD__ );
1506                                 } else {
1507                                         global $wgUseRCPatrol;
1508                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1509                                         # Update recentchanges
1510                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1511                                                 # Mark as patrolled if the user can do so
1512                                                 $patrolled = $wgUseRCPatrol && !count(
1513                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1514                                                 # Add RC row to the DB
1515                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1516                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1517                                                         $revisionId, $patrolled
1518                                                 );
1519
1520                                                 # Log auto-patrolled edits
1521                                                 if ( $patrolled ) {
1522                                                         PatrolLog::record( $rc, true, $user );
1523                                                 }
1524                                         }
1525                                         $user->incEditCount();
1526                                         $dbw->commit( __METHOD__ );
1527                                 }
1528                         } else {
1529                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1530                                 // related variables correctly
1531                                 $revision->setId( $this->getLatest() );
1532                         }
1533
1534                         if ( !$wgDBtransactions ) {
1535                                 ignore_user_abort( $userAbort );
1536                         }
1537
1538                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1539                         if ( !$status->isOK() ) {
1540                                 wfProfileOut( __METHOD__ );
1541                                 return $status;
1542                         }
1543
1544                         # Update links tables, site stats, etc.
1545                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1546                                 'oldcountable' => $oldcountable ) );
1547
1548                         if ( !$changed ) {
1549                                 $status->warning( 'edit-no-change' );
1550                                 $revision = null;
1551                                 // Update page_touched, this is usually implicit in the page update
1552                                 // Other cache updates are done in onArticleEdit()
1553                                 $this->mTitle->invalidateCache();
1554                         }
1555                 } else {
1556                         # Create new article
1557                         $status->value['new'] = true;
1558
1559                         $dbw->begin( __METHOD__ );
1560
1561                         # Add the page record; stake our claim on this title!
1562                         # This will return false if the article already exists
1563                         $newid = $this->insertOn( $dbw );
1564
1565                         if ( $newid === false ) {
1566                                 $dbw->rollback( __METHOD__ );
1567                                 $status->fatal( 'edit-already-exists' );
1568
1569                                 wfProfileOut( __METHOD__ );
1570                                 return $status;
1571                         }
1572
1573                         # Save the revision text...
1574                         $revision = new Revision( array(
1575                                 'page'       => $newid,
1576                                 'comment'    => $summary,
1577                                 'minor_edit' => $isminor,
1578                                 'text'       => $serialized,
1579                 'len'        => $newsize,
1580                                 'user'       => $user->getId(),
1581                                 'user_text'  => $user->getName(),
1582                                 'timestamp'  => $now,
1583                 'content_model' => $content->getModelName(),
1584                 'content_format' => $serialisation_format,
1585                         ) );
1586                         $revisionId = $revision->insertOn( $dbw );
1587
1588                         # Update the page record with revision data
1589                         $this->updateRevisionOn( $dbw, $revision, 0 );
1590
1591                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1592
1593                         # Update recentchanges
1594                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1595                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1596
1597                                 # Mark as patrolled if the user can do so
1598                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1599                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1600                                 # Add RC row to the DB
1601                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1602                                         '', $content->getSize(), $revisionId, $patrolled );
1603
1604                                 # Log auto-patrolled edits
1605                                 if ( $patrolled ) {
1606                                         PatrolLog::record( $rc, true, $user );
1607                                 }
1608                         }
1609                         $user->incEditCount();
1610                         $dbw->commit( __METHOD__ );
1611
1612                         # Update links, etc.
1613                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1614
1615                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary, #FIXME: deprecate legacy hook
1616                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1617
1618             wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1619                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1620                 }
1621
1622                 # Do updates right now unless deferral was requested
1623                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1624                         DeferredUpdates::doUpdates();
1625                 }
1626
1627                 // Return the new revision (or null) to the caller
1628                 $status->value['revision'] = $revision;
1629
1630                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,  #FIXME: deprecate legacy hook
1631                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1632
1633         wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary, #FIXME: document new hook
1634             $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1635
1636                 # Promote user to any groups they meet the criteria for
1637                 $user->addAutopromoteOnceGroups( 'onEdit' );
1638
1639                 wfProfileOut( __METHOD__ );
1640                 return $status;
1641         }
1642
1643         /**
1644          * Get parser options suitable for rendering the primary article wikitext
1645          * @param User|string $user User object or 'canonical'
1646          * @return ParserOptions
1647          */
1648         public function makeParserOptions( $user ) {
1649                 global $wgContLang;
1650                 if ( $user instanceof User ) { // settings per user (even anons)
1651                         $options = ParserOptions::newFromUser( $user );
1652                 } else { // canonical settings
1653                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1654                 }
1655                 $options->enableLimitReport(); // show inclusion/loop reports
1656                 $options->setTidy( true ); // fix bad HTML
1657                 return $options;
1658         }
1659
1660         /**
1661          * Prepare text which is about to be saved.
1662          * Returns a stdclass with source, pst and output members
1663          *
1664          * @deprecated in 1.WD: use prepareContentForEdit instead.
1665          */
1666     public function prepareTextForEdit( $text, $revid = null, User $user = null ) {  #FIXME: use prepareContentForEdit() instead #XXX: who uses this?!
1667         #TODO: log use of deprecated function
1668         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1669         return $this->prepareContentForEdit( $content, $revid , $user );
1670     }
1671
1672     /**
1673      * Prepare content which is about to be saved.
1674      * Returns a stdclass with source, pst and output members
1675      *
1676      * @param \Content $content
1677      * @param null $revid
1678      * @param null|\User $user
1679      * @param null $serialization_format
1680      *
1681      * @return bool|object
1682      *
1683      * @since 1.WD
1684      */
1685         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) { #FIXME: use this #XXX: really public?!
1686                 global $wgParser, $wgContLang, $wgUser;
1687                 $user = is_null( $user ) ? $wgUser : $user;
1688                 // @TODO fixme: check $user->getId() here???
1689
1690                 if ( $this->mPreparedEdit
1691                         && $this->mPreparedEdit->newContent
1692             && $this->mPreparedEdit->newContent->equals( $content )
1693                         && $this->mPreparedEdit->revid == $revid
1694             && $this->mPreparedEdit->format == $serialization_format
1695             #XXX: also check $user here?
1696                 ) {
1697                         // Already prepared
1698                         return $this->mPreparedEdit;
1699                 }
1700
1701                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1702                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1703
1704                 $edit = (object)array();
1705                 $edit->revid = $revid;
1706
1707                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1708         $edit->pst = $edit->pstContent->serialize( $serialization_format );
1709         $edit->format = $serialization_format;
1710
1711                 $edit->popts = $this->makeParserOptions( 'canonical' );
1712
1713                 // TODO: is there no better way to obtain a context here?
1714                 $context = RequestContext::getMain();
1715                 $context->setTitle( $this->mTitle );
1716                 $edit->output = $edit->pstContent->getParserOutput( $context, $revid, $edit->popts );
1717
1718         $edit->newContent = $content;
1719                 $edit->oldContent = $this->getContent( Revision::RAW );
1720
1721         $edit->newText = ContentHandler::getContentText( $edit->newContent ); #FIXME: B/C only! don't use this field!
1722         $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : ''; #FIXME: B/C only! don't use this field!
1723
1724                 $this->mPreparedEdit = $edit;
1725
1726                 return $edit;
1727         }
1728
1729         /**
1730          * Do standard deferred updates after page edit.
1731          * Update links tables, site stats, search index and message cache.
1732          * Purges pages that include this page if the text was changed here.
1733          * Every 100th edit, prune the recent changes table.
1734          *
1735          * @param $revision Revision object
1736          * @param $user User object that did the revision
1737          * @param $options Array of options, following indexes are used:
1738          * - changed: boolean, whether the revision changed the content (default true)
1739          * - created: boolean, whether the revision created the page (default false)
1740          * - oldcountable: boolean or null (default null):
1741          *   - boolean: whether the page was counted as an article before that
1742          *     revision, only used in changed is true and created is false
1743          *   - null: don't change the article count
1744          */
1745         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1746                 global $wgEnableParserCache;
1747
1748                 wfProfileIn( __METHOD__ );
1749
1750                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1751         $content = $revision->getContent();
1752
1753                 # Parse the text
1754                 # Be careful not to double-PST: $text is usually already PST-ed once
1755                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1756                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1757                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
1758                 } else {
1759                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1760                         $editInfo = $this->mPreparedEdit;
1761                 }
1762
1763                 # Save it to the parser cache
1764                 if ( $wgEnableParserCache ) {
1765                         $parserCache = ParserCache::singleton();
1766                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1767                 }
1768
1769                 # Update the links tables and other secondary data
1770         $updates = $editInfo->output->getSecondaryDataUpdates( $this->mTitle );
1771         SecondaryDataUpdate::runUpdates( $updates );
1772
1773                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1774
1775                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1776                         if ( 0 == mt_rand( 0, 99 ) ) {
1777                                 // Flush old entries from the `recentchanges` table; we do this on
1778                                 // random requests so as to avoid an increase in writes for no good reason
1779                                 global $wgRCMaxAge;
1780
1781                                 $dbw = wfGetDB( DB_MASTER );
1782                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1783                                 $dbw->delete(
1784                                         'recentchanges',
1785                                         array( "rc_timestamp < '$cutoff'" ),
1786                                         __METHOD__
1787                                 );
1788                         }
1789                 }
1790
1791                 if ( !$this->mTitle->exists() ) {
1792                         wfProfileOut( __METHOD__ );
1793                         return;
1794                 }
1795
1796                 $id = $this->getId();
1797                 $title = $this->mTitle->getPrefixedDBkey();
1798                 $shortTitle = $this->mTitle->getDBkey();
1799
1800                 if ( !$options['changed'] ) {
1801                         $good = 0;
1802                         $total = 0;
1803                 } elseif ( $options['created'] ) {
1804                         $good = (int)$this->isCountable( $editInfo );
1805                         $total = 1;
1806                 } elseif ( $options['oldcountable'] !== null ) {
1807                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1808                         $total = 0;
1809                 } else {
1810                         $good = 0;
1811                         $total = 0;
1812                 }
1813
1814                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1815         DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
1816
1817                 # If this is another user's talk page, update newtalk.
1818                 # Don't do this if $options['changed'] = false (null-edits) nor if
1819                 # it's a minor edit and the user doesn't want notifications for those.
1820                 if ( $options['changed']
1821                         && $this->mTitle->getNamespace() == NS_USER_TALK
1822                         && $shortTitle != $user->getTitleKey()
1823                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1824                 ) {
1825                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1826                                 $other = User::newFromName( $shortTitle, false );
1827                                 if ( !$other ) {
1828                                         wfDebug( __METHOD__ . ": invalid username\n" );
1829                                 } elseif ( User::isIP( $shortTitle ) ) {
1830                                         // An anonymous user
1831                                         $other->setNewtalk( true );
1832                                 } elseif ( $other->isLoggedIn() ) {
1833                                         $other->setNewtalk( true );
1834                                 } else {
1835                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1836                                 }
1837                         }
1838                 }
1839
1840                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1841             $msgtext = ContentHandler::getContentText( $content ); #XXX: could skip pseudo-messages like js/css here, based on content model.
1842             if ( $msgtext === false || $msgtext === null ) $msgtext = '';
1843
1844                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
1845                 }
1846
1847                 if( $options['created'] ) {
1848                         self::onArticleCreate( $this->mTitle );
1849                 } else {
1850                         self::onArticleEdit( $this->mTitle );
1851                 }
1852
1853                 wfProfileOut( __METHOD__ );
1854         }
1855
1856         /**
1857          * Edit an article without doing all that other stuff
1858          * The article must already exist; link tables etc
1859          * are not updated, caches are not flushed.
1860          *
1861          * @param $text String: text submitted
1862          * @param $user User The relevant user
1863          * @param $comment String: comment submitted
1864          * @param $minor Boolean: whereas it's a minor modification
1865          *
1866          * @deprecated since 1.WD, use doEditContent() instead.
1867          */
1868     public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1869         wfDeprecated( __METHOD__, "1.WD" );
1870
1871         $content = ContentHandler::makeContent( $text, $this->getTitle() );
1872         return $this->doQuickEditContent( $content, $user, $comment , $minor );
1873     }
1874
1875     /**
1876      * Edit an article without doing all that other stuff
1877      * The article must already exist; link tables etc
1878      * are not updated, caches are not flushed.
1879      *
1880      * @param $content Content: content submitted
1881      * @param $user User The relevant user
1882      * @param $comment String: comment submitted
1883      * @param $serialisation_format String: format for storing the content in the database
1884      * @param $minor Boolean: whereas it's a minor modification
1885      */
1886         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
1887                 wfProfileIn( __METHOD__ );
1888
1889         $serialized = $content->serialize( $serialisation_format );
1890
1891                 $dbw = wfGetDB( DB_MASTER );
1892                 $revision = new Revision( array(
1893                         'page'       => $this->getId(),
1894                         'text'       => $serialized,
1895             'length'     => $content->getSize(),
1896                         'comment'    => $comment,
1897                         'minor_edit' => $minor ? 1 : 0,
1898                 ) );
1899                 $revision->insertOn( $dbw );
1900                 $this->updateRevisionOn( $dbw, $revision );
1901
1902                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1903
1904                 wfProfileOut( __METHOD__ );
1905         }
1906
1907         /**
1908          * Update the article's restriction field, and leave a log entry.
1909          * This works for protection both existing and non-existing pages.
1910          *
1911          * @param $limit Array: set of restriction keys
1912          * @param $reason String
1913          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1914          * @param $expiry Array: per restriction type expiration
1915          * @param $user User The user updating the restrictions
1916          * @return bool true on success
1917          */
1918         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1919                 global $wgContLang;
1920
1921                 if ( wfReadOnly() ) {
1922                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1923                 }
1924
1925                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1926
1927                 $id = $this->mTitle->getArticleID();
1928
1929                 if ( !$cascade ) {
1930                         $cascade = false;
1931                 }
1932
1933                 // Take this opportunity to purge out expired restrictions
1934                 Title::purgeExpiredRestrictions();
1935
1936                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1937                 # we expect a single selection, but the schema allows otherwise.
1938                 $isProtected = false;
1939                 $protect = false;
1940                 $changed = false;
1941
1942                 $dbw = wfGetDB( DB_MASTER );
1943
1944                 foreach ( $restrictionTypes as $action ) {
1945                         if ( !isset( $expiry[$action] ) ) {
1946                                 $expiry[$action] = $dbw->getInfinity();
1947                         }
1948                         if ( !isset( $limit[$action] ) ) {
1949                                 $limit[$action] = '';
1950                         } elseif ( $limit[$action] != '' ) {
1951                                 $protect = true;
1952                         }
1953
1954                         # Get current restrictions on $action
1955                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1956                         if ( $current != '' ) {
1957                                 $isProtected = true;
1958                         }
1959
1960                         if ( $limit[$action] != $current ) {
1961                                 $changed = true;
1962                         } elseif ( $limit[$action] != '' ) {
1963                                 # Only check expiry change if the action is actually being
1964                                 # protected, since expiry does nothing on an not-protected
1965                                 # action.
1966                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1967                                         $changed = true;
1968                                 }
1969                         }
1970                 }
1971
1972                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1973                         $changed = true;
1974                 }
1975
1976                 # If nothing's changed, do nothing
1977                 if ( !$changed ) {
1978                         return Status::newGood();
1979                 }
1980
1981                 if ( !$protect ) { # No protection at all means unprotection
1982                         $revCommentMsg = 'unprotectedarticle';
1983                         $logAction = 'unprotect';
1984                 } elseif ( $isProtected ) {
1985                         $revCommentMsg = 'modifiedarticleprotection';
1986                         $logAction = 'modify';
1987                 } else {
1988                         $revCommentMsg = 'protectedarticle';
1989                         $logAction = 'protect';
1990                 }
1991
1992                 $encodedExpiry = array();
1993                 $protectDescription = '';
1994                 foreach ( $limit as $action => $restrictions ) {
1995                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1996                         if ( $restrictions != '' ) {
1997                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1998                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1999                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
2000                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2001                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2002                                                 $wgContLang->time( $expiry[$action], false, false ) );
2003                                 } else {
2004                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
2005                                 }
2006
2007                                 $protectDescription .= ') ';
2008                         }
2009                 }
2010                 $protectDescription = trim( $protectDescription );
2011
2012                 if ( $id ) { # Protection of existing page
2013                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2014                                 return Status::newGood();
2015                         }
2016
2017                         # Only restrictions with the 'protect' right can cascade...
2018                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2019                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2020
2021                         # The schema allows multiple restrictions
2022                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2023                                 $cascade = false;
2024                         }
2025
2026                         # Update restrictions table
2027                         foreach ( $limit as $action => $restrictions ) {
2028                                 if ( $restrictions != '' ) {
2029                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2030                                                 array( 'pr_page' => $id,
2031                                                         'pr_type' => $action,
2032                                                         'pr_level' => $restrictions,
2033                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2034                                                         'pr_expiry' => $encodedExpiry[$action]
2035                                                 ),
2036                                                 __METHOD__
2037                                         );
2038                                 } else {
2039                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2040                                                 'pr_type' => $action ), __METHOD__ );
2041                                 }
2042                         }
2043
2044                         # Prepare a null revision to be added to the history
2045                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2046                         if ( $reason ) {
2047                                 $editComment .= ": $reason";
2048                         }
2049                         if ( $protectDescription ) {
2050                                 $editComment .= " ($protectDescription)";
2051                         }
2052                         if ( $cascade ) {
2053                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2054                         }
2055
2056                         # Insert a null revision
2057                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2058                         $nullRevId = $nullRevision->insertOn( $dbw );
2059
2060                         $latest = $this->getLatest();
2061                         # Update page record
2062                         $dbw->update( 'page',
2063                                 array( /* SET */
2064                                         'page_touched' => $dbw->timestamp(),
2065                                         'page_restrictions' => '',
2066                                         'page_latest' => $nullRevId
2067                                 ), array( /* WHERE */
2068                                         'page_id' => $id
2069                                 ), __METHOD__
2070                         );
2071
2072                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2073                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2074                 } else { # Protection of non-existing page (also known as "title protection")
2075                         # Cascade protection is meaningless in this case
2076                         $cascade = false;
2077
2078                         if ( $limit['create'] != '' ) {
2079                                 $dbw->replace( 'protected_titles',
2080                                         array( array( 'pt_namespace', 'pt_title' ) ),
2081                                         array(
2082                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2083                                                 'pt_title' => $this->mTitle->getDBkey(),
2084                                                 'pt_create_perm' => $limit['create'],
2085                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2086                                                 'pt_expiry' => $encodedExpiry['create'],
2087                                                 'pt_user' => $user->getId(),
2088                                                 'pt_reason' => $reason,
2089                                         ), __METHOD__
2090                                 );
2091                         } else {
2092                                 $dbw->delete( 'protected_titles',
2093                                         array(
2094                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2095                                                 'pt_title' => $this->mTitle->getDBkey()
2096                                         ), __METHOD__
2097                                 );
2098                         }
2099                 }
2100
2101                 $this->mTitle->flushRestrictions();
2102
2103                 if ( $logAction == 'unprotect' ) {
2104                         $logParams = array();
2105                 } else {
2106                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2107                 }
2108
2109                 # Update the protection log
2110                 $log = new LogPage( 'protect' );
2111                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2112
2113                 return Status::newGood();
2114         }
2115
2116         /**
2117          * Take an array of page restrictions and flatten it to a string
2118          * suitable for insertion into the page_restrictions field.
2119          * @param $limit Array
2120          * @return String
2121          */
2122         protected static function flattenRestrictions( $limit ) {
2123                 if ( !is_array( $limit ) ) {
2124                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2125                 }
2126
2127                 $bits = array();
2128                 ksort( $limit );
2129
2130                 foreach ( $limit as $action => $restrictions ) {
2131                         if ( $restrictions != '' ) {
2132                                 $bits[] = "$action=$restrictions";
2133                         }
2134                 }
2135
2136                 return implode( ':', $bits );
2137         }
2138
2139         /**
2140          * Same as doDeleteArticleReal(), but returns more detailed success/failure status
2141          * Deletes the article with database consistency, writes logs, purges caches
2142          *
2143          * @param $reason string delete reason for deletion log
2144          * @param $suppress int bitfield
2145          *      Revision::DELETED_TEXT
2146          *      Revision::DELETED_COMMENT
2147          *      Revision::DELETED_USER
2148          *      Revision::DELETED_RESTRICTED
2149          * @param $id int article ID
2150          * @param $commit boolean defaults to true, triggers transaction end
2151          * @param &$error Array of errors to append to
2152          * @param $user User The deleting user
2153          * @return boolean true if successful
2154          */
2155         public function doDeleteArticle(
2156                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2157         ) {
2158                 return $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user )
2159                         == WikiPage::DELETE_SUCCESS;
2160         }
2161
2162         /**
2163          * Back-end article deletion
2164          * Deletes the article with database consistency, writes logs, purges caches
2165          *
2166          * @param $reason string delete reason for deletion log
2167          * @param $suppress int bitfield
2168          *      Revision::DELETED_TEXT
2169          *      Revision::DELETED_COMMENT
2170          *      Revision::DELETED_USER
2171          *      Revision::DELETED_RESTRICTED
2172          * @param $id int article ID
2173          * @param $commit boolean defaults to true, triggers transaction end
2174          * @param &$error Array of errors to append to
2175          * @param $user User The deleting user
2176          * @return int: One of WikiPage::DELETE_* constants
2177          */
2178         public function doDeleteArticleReal(
2179                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2180         ) {
2181                 global $wgUser;
2182                 $user = is_null( $user ) ? $wgUser : $user;
2183
2184                 wfDebug( __METHOD__ . "\n" );
2185
2186                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
2187                         return WikiPage::DELETE_HOOK_ABORTED;
2188                 }
2189                 $dbw = wfGetDB( DB_MASTER );
2190                 $t = $this->mTitle->getDBkey();
2191                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
2192
2193                 if ( $t === '' || $id == 0 ) {
2194                         return WikiPage::DELETE_NO_PAGE;
2195                 }
2196
2197                 // Bitfields to further suppress the content
2198                 if ( $suppress ) {
2199                         $bitfield = 0;
2200                         // This should be 15...
2201                         $bitfield |= Revision::DELETED_TEXT;
2202                         $bitfield |= Revision::DELETED_COMMENT;
2203                         $bitfield |= Revision::DELETED_USER;
2204                         $bitfield |= Revision::DELETED_RESTRICTED;
2205                 } else {
2206                         $bitfield = 'rev_deleted';
2207                 }
2208
2209                 $dbw->begin( __METHOD__ );
2210                 // For now, shunt the revision data into the archive table.
2211                 // Text is *not* removed from the text table; bulk storage
2212                 // is left intact to avoid breaking block-compression or
2213                 // immutable storage schemes.
2214                 //
2215                 // For backwards compatibility, note that some older archive
2216                 // table entries will have ar_text and ar_flags fields still.
2217                 //
2218                 // In the future, we may keep revisions and mark them with
2219                 // the rev_deleted field, which is reserved for this purpose.
2220                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2221                         array(
2222                                 'ar_namespace'  => 'page_namespace',
2223                                 'ar_title'      => 'page_title',
2224                                 'ar_comment'    => 'rev_comment',
2225                                 'ar_user'       => 'rev_user',
2226                                 'ar_user_text'  => 'rev_user_text',
2227                                 'ar_timestamp'  => 'rev_timestamp',
2228                                 'ar_minor_edit' => 'rev_minor_edit',
2229                                 'ar_rev_id'     => 'rev_id',
2230                                 'ar_parent_id'  => 'rev_parent_id',
2231                                 'ar_text_id'    => 'rev_text_id',
2232                                 'ar_text'       => '\'\'', // Be explicit to appease
2233                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2234                                 'ar_len'        => 'rev_len',
2235                                 'ar_page_id'    => 'page_id',
2236                                 'ar_deleted'    => $bitfield,
2237                                 'ar_sha1'       => 'rev_content_model',
2238                                 'ar_content_format'       => 'rev_content_format',
2239                                 'ar_content_format'       => 'rev_sha1'
2240                         ), array(
2241                                 'page_id' => $id,
2242                                 'page_id = rev_page'
2243                         ), __METHOD__
2244                 );
2245
2246                 # Now that it's safely backed up, delete it
2247                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2248                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2249
2250                 if ( !$ok ) {
2251                         $dbw->rollback( __METHOD__ );
2252                         return WikiPage::DELETE_NO_REVISIONS;
2253                 }
2254
2255                 $this->doDeleteUpdates( $id );
2256
2257                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2258                 $logtype = $suppress ? 'suppress' : 'delete';
2259
2260                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2261                 $logEntry->setPerformer( $user );
2262                 $logEntry->setTarget( $this->mTitle );
2263                 $logEntry->setComment( $reason );
2264                 $logid = $logEntry->insert();
2265                 $logEntry->publish( $logid );
2266
2267                 if ( $commit ) {
2268                         $dbw->commit( __METHOD__ );
2269                 }
2270
2271                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2272                 return WikiPage::DELETE_SUCCESS;
2273         }
2274
2275         /**
2276          * Do some database updates after deletion
2277          *
2278          * @param $id Int: page_id value of the page being deleted
2279          */
2280         public function doDeleteUpdates( $id ) {
2281                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2282
2283                 $dbw = wfGetDB( DB_MASTER );
2284
2285                 # Delete restrictions for it
2286                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2287
2288                 # Fix category table counts
2289                 $cats = array();
2290                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2291
2292                 foreach ( $res as $row ) {
2293                         $cats [] = $row->cl_to;
2294                 }
2295
2296                 $this->updateCategoryCounts( array(), $cats );
2297
2298         #TODO: move this to an Update object!
2299
2300                 # If using cascading deletes, we can skip some explicit deletes
2301                 if ( !$dbw->cascadingDeletes() ) {
2302                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2303
2304                         # Delete outgoing links
2305                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2306                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2307                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2308                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2309                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2310                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2311                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2312                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2313                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2314                 }
2315
2316                 # If using cleanup triggers, we can skip some manual deletes
2317                 if ( !$dbw->cleanupTriggers() ) {
2318                         # Clean up recentchanges entries...
2319                         $dbw->delete( 'recentchanges',
2320                                 array( 'rc_type != ' . RC_LOG,
2321                                         'rc_namespace' => $this->mTitle->getNamespace(),
2322                                         'rc_title' => $this->mTitle->getDBkey() ),
2323                                 __METHOD__ );
2324                         $dbw->delete( 'recentchanges',
2325                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2326                                 __METHOD__ );
2327                 }
2328
2329                 # Clear caches
2330                 self::onArticleDelete( $this->mTitle );
2331
2332                 # Reset this object
2333                 $this->clear();
2334
2335                 # Clear the cached article id so the interface doesn't act like we exist
2336                 $this->mTitle->resetArticleID( 0 );
2337         }
2338
2339         /**
2340          * Roll back the most recent consecutive set of edits to a page
2341          * from the same user; fails if there are no eligible edits to
2342          * roll back to, e.g. user is the sole contributor. This function
2343          * performs permissions checks on $user, then calls commitRollback()
2344          * to do the dirty work
2345          *
2346          * @todo: seperate the business/permission stuff out from backend code
2347          *
2348          * @param $fromP String: Name of the user whose edits to rollback.
2349          * @param $summary String: Custom summary. Set to default summary if empty.
2350          * @param $token String: Rollback token.
2351          * @param $bot Boolean: If true, mark all reverted edits as bot.
2352          *
2353          * @param $resultDetails Array: contains result-specific array of additional values
2354          *    'alreadyrolled' : 'current' (rev)
2355          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2356          *
2357          * @param $user User The user performing the rollback
2358          * @return array of errors, each error formatted as
2359          *   array(messagekey, param1, param2, ...).
2360          * On success, the array is empty.  This array can also be passed to
2361          * OutputPage::showPermissionsErrorPage().
2362          */
2363         public function doRollback(
2364                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2365         ) {
2366                 $resultDetails = null;
2367
2368                 # Check permissions
2369                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2370                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2371                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2372
2373                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2374                         $errors[] = array( 'sessionfailure' );
2375                 }
2376
2377                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2378                         $errors[] = array( 'actionthrottledtext' );
2379                 }
2380
2381                 # If there were errors, bail out now
2382                 if ( !empty( $errors ) ) {
2383                         return $errors;
2384                 }
2385
2386                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2387         }
2388
2389         /**
2390          * Backend implementation of doRollback(), please refer there for parameter
2391          * and return value documentation
2392          *
2393          * NOTE: This function does NOT check ANY permissions, it just commits the
2394          * rollback to the DB. Therefore, you should only call this function direct-
2395          * ly if you want to use custom permissions checks. If you don't, use
2396          * doRollback() instead.
2397          * @param $fromP String: Name of the user whose edits to rollback.
2398          * @param $summary String: Custom summary. Set to default summary if empty.
2399          * @param $bot Boolean: If true, mark all reverted edits as bot.
2400          *
2401          * @param $resultDetails Array: contains result-specific array of additional values
2402          * @param $guser User The user performing the rollback
2403          * @return array
2404          */
2405         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2406                 global $wgUseRCPatrol, $wgContLang;
2407
2408                 $dbw = wfGetDB( DB_MASTER );
2409
2410                 if ( wfReadOnly() ) {
2411                         return array( array( 'readonlytext' ) );
2412                 }
2413
2414                 # Get the last editor
2415                 $current = $this->getRevision();
2416                 if ( is_null( $current ) ) {
2417                         # Something wrong... no page?
2418                         return array( array( 'notanarticle' ) );
2419                 }
2420
2421                 $from = str_replace( '_', ' ', $fromP );
2422                 # User name given should match up with the top revision.
2423                 # If the user was deleted then $from should be empty.
2424                 if ( $from != $current->getUserText() ) {
2425                         $resultDetails = array( 'current' => $current );
2426                         return array( array( 'alreadyrolled',
2427                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2428                                 htmlspecialchars( $fromP ),
2429                                 htmlspecialchars( $current->getUserText() )
2430                         ) );
2431                 }
2432
2433                 # Get the last edit not by this guy...
2434                 # Note: these may not be public values
2435                 $user = intval( $current->getRawUser() );
2436                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2437                 $s = $dbw->selectRow( 'revision',
2438                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2439                         array( 'rev_page' => $current->getPage(),
2440                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2441                         ), __METHOD__,
2442                         array( 'USE INDEX' => 'page_timestamp',
2443                                 'ORDER BY' => 'rev_timestamp DESC' )
2444                         );
2445                 if ( $s === false ) {
2446                         # No one else ever edited this page
2447                         return array( array( 'cantrollback' ) );
2448                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2449                         # Only admins can see this text
2450                         return array( array( 'notvisiblerev' ) );
2451                 }
2452
2453                 $set = array();
2454                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2455                         # Mark all reverted edits as bot
2456                         $set['rc_bot'] = 1;
2457                 }
2458
2459                 if ( $wgUseRCPatrol ) {
2460                         # Mark all reverted edits as patrolled
2461                         $set['rc_patrolled'] = 1;
2462                 }
2463
2464                 if ( count( $set ) ) {
2465                         $dbw->update( 'recentchanges', $set,
2466                                 array( /* WHERE */
2467                                         'rc_cur_id' => $current->getPage(),
2468                                         'rc_user_text' => $current->getUserText(),
2469                                         "rc_timestamp > '{$s->rev_timestamp}'",
2470                                 ), __METHOD__
2471                         );
2472                 }
2473
2474                 # Generate the edit summary if necessary
2475                 $target = Revision::newFromId( $s->rev_id );
2476                 if ( empty( $summary ) ) {
2477                         if ( $from == '' ) { // no public user name
2478                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2479                         } else {
2480                                 $summary = wfMsgForContent( 'revertpage' );
2481                         }
2482                 }
2483
2484                 # Allow the custom summary to use the same args as the default message
2485                 $args = array(
2486                         $target->getUserText(), $from, $s->rev_id,
2487                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2488                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2489                 );
2490                 $summary = wfMsgReplaceArgs( $summary, $args );
2491
2492                 # Save
2493                 $flags = EDIT_UPDATE;
2494
2495                 if ( $guser->isAllowed( 'minoredit' ) ) {
2496                         $flags |= EDIT_MINOR;
2497                 }
2498
2499                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2500                         $flags |= EDIT_FORCE_BOT;
2501                 }
2502
2503                 # Actually store the edit
2504                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2505                 if ( !empty( $status->value['revision'] ) ) {
2506                         $revId = $status->value['revision']->getId();
2507                 } else {
2508                         $revId = false;
2509                 }
2510
2511                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2512
2513                 $resultDetails = array(
2514                         'summary' => $summary,
2515                         'current' => $current,
2516                         'target'  => $target,
2517                         'newid'   => $revId
2518                 );
2519
2520                 return array();
2521         }
2522
2523         /**
2524          * The onArticle*() functions are supposed to be a kind of hooks
2525          * which should be called whenever any of the specified actions
2526          * are done.
2527          *
2528          * This is a good place to put code to clear caches, for instance.
2529          *
2530          * This is called on page move and undelete, as well as edit
2531          *
2532          * @param $title Title object
2533          */
2534         public static function onArticleCreate( $title ) {
2535                 # Update existence markers on article/talk tabs...
2536                 if ( $title->isTalkPage() ) {
2537                         $other = $title->getSubjectPage();
2538                 } else {
2539                         $other = $title->getTalkPage();
2540                 }
2541
2542                 $other->invalidateCache();
2543                 $other->purgeSquid();
2544
2545                 $title->touchLinks();
2546                 $title->purgeSquid();
2547                 $title->deleteTitleProtection();
2548         }
2549
2550         /**
2551          * Clears caches when article is deleted
2552          *
2553          * @param $title Title
2554          */
2555         public static function onArticleDelete( $title ) {
2556                 # Update existence markers on article/talk tabs...
2557                 if ( $title->isTalkPage() ) {
2558                         $other = $title->getSubjectPage();
2559                 } else {
2560                         $other = $title->getTalkPage();
2561                 }
2562
2563                 $other->invalidateCache();
2564                 $other->purgeSquid();
2565
2566                 $title->touchLinks();
2567                 $title->purgeSquid();
2568
2569                 # File cache
2570                 HTMLFileCache::clearFileCache( $title );
2571
2572                 # Messages
2573                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2574                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2575                 }
2576
2577                 # Images
2578                 if ( $title->getNamespace() == NS_FILE ) {
2579                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2580                         $update->doUpdate();
2581                 }
2582
2583                 # User talk pages
2584                 if ( $title->getNamespace() == NS_USER_TALK ) {
2585                         $user = User::newFromName( $title->getText(), false );
2586                         if ( $user ) {
2587                                 $user->setNewtalk( false );
2588                         }
2589                 }
2590
2591                 # Image redirects
2592                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2593         }
2594
2595         /**
2596          * Purge caches on page update etc
2597          *
2598          * @param $title Title object
2599          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2600          */
2601         public static function onArticleEdit( $title ) {
2602                 // Invalidate caches of articles which include this page
2603                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2604
2605
2606                 // Invalidate the caches of all pages which redirect here
2607                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2608
2609                 # Purge squid for this page only
2610                 $title->purgeSquid();
2611
2612                 # Clear file cache for this page only
2613                 HTMLFileCache::clearFileCache( $title );
2614         }
2615
2616         /**#@-*/
2617
2618         /**
2619          * Returns a list of hidden categories this page is a member of.
2620          * Uses the page_props and categorylinks tables.
2621          *
2622          * @return Array of Title objects
2623          */
2624         public function getHiddenCategories() {
2625                 $result = array();
2626                 $id = $this->mTitle->getArticleID();
2627
2628                 if ( $id == 0 ) {
2629                         return array();
2630                 }
2631
2632                 $dbr = wfGetDB( DB_SLAVE );
2633                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2634                         array( 'cl_to' ),
2635                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2636                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2637                         __METHOD__ );
2638
2639                 if ( $res !== false ) {
2640                         foreach ( $res as $row ) {
2641                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2642                         }
2643                 }
2644
2645                 return $result;
2646         }
2647
2648         /**
2649         * Return an applicable autosummary if one exists for the given edit.
2650         * @param $oldtext String|null: the previous text of the page.
2651         * @param $newtext String|null: The submitted text of the page.
2652         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2653         * @return string An appropriate autosummary, or an empty string.
2654     * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
2655         */
2656         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2657                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2658
2659                 wfDeprecated( __METHOD__, '1.WD' );
2660
2661         $handler = ContentHandler::getForModelName( CONTENT_MODEL_WIKITEXT );
2662         $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2663         $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2664
2665         return $handler->getAutosummary( $oldContent, $newContent, $flags );
2666         }
2667
2668         /**
2669          * Auto-generates a deletion reason
2670          *
2671          * @param &$hasHistory Boolean: whether the page has a history
2672          * @return mixed String containing deletion reason or empty string, or boolean false
2673          *    if no revision occurred
2674      * @deprecated since 1.WD, use ContentHandler::getAutoDeleteReason() instead
2675          */
2676         public function getAutoDeleteReason( &$hasHistory ) {
2677         #NOTE: stub for backwards-compatibility.
2678
2679                 wfDeprecated( __METHOD__, '1.WD' );
2680
2681                 $handler = ContentHandler::getForTitle( $this->getTitle() );
2682         $handler->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2683                 global $wgContLang;
2684
2685                 // Get the last revision
2686                 $rev = $this->getRevision();
2687
2688                 if ( is_null( $rev ) ) {
2689                         return false;
2690                 }
2691
2692                 // Get the article's contents
2693                 $contents = $rev->getText();
2694                 $blank = false;
2695
2696                 // If the page is blank, use the text from the previous revision,
2697                 // which can only be blank if there's a move/import/protect dummy revision involved
2698                 if ( $contents == '' ) {
2699                         $prev = $rev->getPrevious();
2700
2701                         if ( $prev )    {
2702                                 $contents = $prev->getText();
2703                                 $blank = true;
2704                         }
2705                 }
2706
2707                 $dbw = wfGetDB( DB_MASTER );
2708
2709                 // Find out if there was only one contributor
2710                 // Only scan the last 20 revisions
2711                 $res = $dbw->select( 'revision', 'rev_user_text',
2712                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2713                         __METHOD__,
2714                         array( 'LIMIT' => 20 )
2715                 );
2716
2717                 if ( $res === false ) {
2718                         // This page has no revisions, which is very weird
2719                         return false;
2720                 }
2721
2722                 $hasHistory = ( $res->numRows() > 1 );
2723                 $row = $dbw->fetchObject( $res );
2724
2725                 if ( $row ) { // $row is false if the only contributor is hidden
2726                         $onlyAuthor = $row->rev_user_text;
2727                         // Try to find a second contributor
2728                         foreach ( $res as $row ) {
2729                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2730                                         $onlyAuthor = false;
2731                                         break;
2732                                 }
2733                         }
2734                 } else {
2735                         $onlyAuthor = false;
2736                 }
2737
2738                 // Generate the summary with a '$1' placeholder
2739                 if ( $blank ) {
2740                         // The current revision is blank and the one before is also
2741                         // blank. It's just not our lucky day
2742                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2743                 } else {
2744                         if ( $onlyAuthor ) {
2745                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2746                         } else {
2747                                 $reason = wfMsgForContent( 'excontent', '$1' );
2748                         }
2749                 }
2750
2751                 if ( $reason == '-' ) {
2752                         // Allow these UI messages to be blanked out cleanly
2753                         return '';
2754                 }
2755
2756                 // Replace newlines with spaces to prevent uglyness
2757                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2758                 // Calculate the maximum amount of chars to get
2759                 // Max content length = max comment length - length of the comment (excl. $1)
2760                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2761                 $contents = $wgContLang->truncate( $contents, $maxLength );
2762                 // Remove possible unfinished links
2763                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2764                 // Now replace the '$1' placeholder
2765                 $reason = str_replace( '$1', $contents, $reason );
2766
2767                 return $reason;
2768         }
2769
2770         /**
2771          * Update all the appropriate counts in the category table, given that
2772          * we've added the categories $added and deleted the categories $deleted.
2773          *
2774          * @param $added array   The names of categories that were added
2775          * @param $deleted array The names of categories that were deleted
2776          */
2777         public function updateCategoryCounts( $added, $deleted ) {
2778                 $ns = $this->mTitle->getNamespace();
2779                 $dbw = wfGetDB( DB_MASTER );
2780
2781                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2782                 # exist, we might legitimately not create it, but it's simpler to just
2783                 # create it and then give it a negative value, since the value is bogus
2784                 # anyway.
2785                 #
2786                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2787                 $insertCats = array_merge( $added, $deleted );
2788                 if ( !$insertCats ) {
2789                         # Okay, nothing to do
2790                         return;
2791                 }
2792
2793                 $insertRows = array();
2794
2795                 foreach ( $insertCats as $cat ) {
2796                         $insertRows[] = array(
2797                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2798                                 'cat_title' => $cat
2799                         );
2800                 }
2801                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2802
2803                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2804                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2805
2806                 if ( $ns == NS_CATEGORY ) {
2807                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2808                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2809                 } elseif ( $ns == NS_FILE ) {
2810                         $addFields[]    = 'cat_files = cat_files + 1';
2811                         $removeFields[] = 'cat_files = cat_files - 1';
2812                 }
2813
2814                 if ( $added ) {
2815                         $dbw->update(
2816                                 'category',
2817                                 $addFields,
2818                                 array( 'cat_title' => $added ),
2819                                 __METHOD__
2820                         );
2821                 }
2822
2823                 if ( $deleted ) {
2824                         $dbw->update(
2825                                 'category',
2826                                 $removeFields,
2827                                 array( 'cat_title' => $deleted ),
2828                                 __METHOD__
2829                         );
2830                 }
2831         }
2832
2833         /**
2834          * Updates cascading protections
2835          *
2836          * @param $parserOutput ParserOutput object for the current version
2837          */
2838         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2839                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2840                         return;
2841                 }
2842
2843                 // templatelinks table may have become out of sync,
2844                 // especially if using variable-based transclusions.
2845                 // For paranoia, check if things have changed and if
2846                 // so apply updates to the database. This will ensure
2847                 // that cascaded protections apply as soon as the changes
2848                 // are visible.
2849
2850                 # Get templates from templatelinks
2851                 $id = $this->mTitle->getArticleID();
2852
2853                 $tlTemplates = array();
2854
2855                 $dbr = wfGetDB( DB_SLAVE );
2856                 $res = $dbr->select( array( 'templatelinks' ),
2857                         array( 'tl_namespace', 'tl_title' ),
2858                         array( 'tl_from' => $id ),
2859                         __METHOD__
2860                 );
2861
2862                 foreach ( $res as $row ) {
2863                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2864                 }
2865
2866                 # Get templates from parser output.
2867                 $poTemplates = array();
2868                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2869                         foreach ( $templates as $dbk => $id ) {
2870                                 $poTemplates["$ns:$dbk"] = true;
2871                         }
2872                 }
2873
2874                 # Get the diff
2875                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2876
2877                 if ( count( $templates_diff ) > 0 ) {
2878                         # Whee, link updates time.
2879             # Note: we are only interested in links here. We don't need to get other SecondaryDataUpdate items from the parser output.
2880                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2881                         $u->doUpdate();
2882                 }
2883         }
2884
2885         /**
2886          * Return a list of templates used by this article.
2887          * Uses the templatelinks table
2888          *
2889          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2890          * @return Array of Title objects
2891          */
2892         public function getUsedTemplates() {
2893                 return $this->mTitle->getTemplateLinksFrom();
2894         }
2895
2896         /**
2897          * Perform article updates on a special page creation.
2898          *
2899          * @param $rev Revision object
2900          *
2901          * @todo This is a shitty interface function. Kill it and replace the
2902          * other shitty functions like doEditUpdates and such so it's not needed
2903          * anymore.
2904          * @deprecated since 1.18, use doEditUpdates()
2905          */
2906         public function createUpdates( $rev ) {
2907                 wfDeprecated( __METHOD__, '1.18' );
2908                 global $wgUser;
2909                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2910         }
2911
2912         /**
2913          * This function is called right before saving the wikitext,
2914          * so we can do things like signatures and links-in-context.
2915          *
2916          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2917          * @param $text String article contents
2918          * @param $user User object: user doing the edit
2919          * @param $popts ParserOptions object: parser options, default options for
2920          *               the user loaded if null given
2921          * @return string article contents with altered wikitext markup (signatures
2922          *      converted, {{subst:}}, templates, etc.)
2923          */
2924         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2925                 global $wgParser, $wgUser;
2926
2927                 wfDeprecated( __METHOD__, '1.19' );
2928
2929                 $user = is_null( $user ) ? $wgUser : $user;
2930
2931                 if ( $popts === null ) {
2932                         $popts = ParserOptions::newFromUser( $user );
2933                 }
2934
2935                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2936         }
2937
2938         /**
2939          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2940          *
2941          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2942          * @return bool
2943          */
2944         public function isBigDeletion() {
2945                 wfDeprecated( __METHOD__, '1.19' );
2946                 return $this->mTitle->isBigDeletion();
2947         }
2948
2949         /**
2950          * Get the  approximate revision count of this page.
2951          *
2952          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2953          * @return int
2954          */
2955         public function estimateRevisionCount() {
2956                 wfDeprecated( __METHOD__, '1.19' );
2957                 return $this->mTitle->estimateRevisionCount();
2958         }
2959
2960         /**
2961          * Update the article's restriction field, and leave a log entry.
2962          *
2963          * @deprecated since 1.19
2964          * @param $limit Array: set of restriction keys
2965          * @param $reason String
2966          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2967          * @param $expiry Array: per restriction type expiration
2968          * @param $user User The user updating the restrictions
2969          * @return bool true on success
2970          */
2971         public function updateRestrictions(
2972                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2973         ) {
2974                 global $wgUser;
2975
2976                 $user = is_null( $user ) ? $wgUser : $user;
2977
2978                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2979         }
2980
2981         /**
2982          * @deprecated since 1.18
2983          */
2984         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2985                 wfDeprecated( __METHOD__, '1.18' );
2986                 global $wgUser;
2987                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2988         }
2989
2990         /**
2991          * @deprecated since 1.18
2992          */
2993         public function viewUpdates() {
2994                 wfDeprecated( __METHOD__, '1.18' );
2995                 global $wgUser;
2996                 return $this->doViewUpdates( $wgUser );
2997         }
2998
2999         /**
3000          * @deprecated since 1.18
3001          * @return bool
3002          */
3003         public function useParserCache( $oldid ) {
3004                 wfDeprecated( __METHOD__, '1.18' );
3005                 global $wgUser;
3006                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3007         }
3008 }
3009
3010 class PoolWorkArticleView extends PoolCounterWork {
3011
3012         /**
3013          * @var Page
3014          */
3015         private $page;
3016
3017         /**
3018          * @var string
3019          */
3020         private $cacheKey;
3021
3022         /**
3023          * @var integer
3024          */
3025         private $revid;
3026
3027         /**
3028          * @var ParserOptions
3029          */
3030         private $parserOptions;
3031
3032         /**
3033          * @var string|null
3034          */
3035         private $text;
3036
3037         /**
3038          * @var ParserOutput|bool
3039          */
3040         private $parserOutput = false;
3041
3042         /**
3043          * @var bool
3044          */
3045         private $isDirty = false;
3046
3047         /**
3048          * @var Status|bool
3049          */
3050         private $error = false;
3051
3052         /**
3053          * Constructor
3054          *
3055          * @param $page Page
3056          * @param $revid Integer: ID of the revision being parsed
3057          * @param $useParserCache Boolean: whether to use the parser cache
3058          * @param $parserOptions parserOptions to use for the parse operation
3059          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3060          * @param $context IContextSource context for parsing
3061          */
3062         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null, IContextSource $context = null ) {
3063         if ( is_string($content) ) { #BC: old style call
3064             $modelName = $page->getRevision()->getContentModelName();
3065             $format = $page->getRevision()->getContentFormat();
3066             $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelName, $format );
3067         }
3068
3069                 if ( is_null( $context ) ) {
3070                         $context = RequestContext::getMain();
3071                         #XXX: clone and then set title?
3072                 }
3073
3074                 $this->page = $page;
3075                 $this->revid = $revid;
3076                 $this->context = $context;
3077                 $this->cacheable = $useParserCache;
3078                 $this->parserOptions = $parserOptions;
3079                 $this->content = $content;
3080                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3081                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3082         }
3083
3084         /**
3085          * Get the ParserOutput from this object, or false in case of failure
3086          *
3087          * @return ParserOutput
3088          */
3089         public function getParserOutput() {
3090                 return $this->parserOutput;
3091         }
3092
3093         /**
3094          * Get whether the ParserOutput is a dirty one (i.e. expired)
3095          *
3096          * @return bool
3097          */
3098         public function getIsDirty() {
3099                 return $this->isDirty;
3100         }
3101
3102         /**
3103          * Get a Status object in case of error or false otherwise
3104          *
3105          * @return Status|bool
3106          */
3107         public function getError() {
3108                 return $this->error;
3109         }
3110
3111         /**
3112          * @return bool
3113          */
3114         function doWork() {
3115                 global $wgUseFileCache;
3116
3117                 // @todo: several of the methods called on $this->page are not declared in Page, but present in WikiPage and delegated by Article.
3118
3119                 $isCurrent = $this->revid === $this->page->getLatest();
3120
3121                 if ( $this->content !== null ) {
3122                         $content = $this->content;
3123                 } elseif ( $isCurrent ) {
3124             $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
3125                 } else {
3126                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3127                         if ( $rev === null ) {
3128                                 return false;
3129                         }
3130             $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
3131                 }
3132
3133                 $time = - microtime( true );
3134                 // TODO: page might not have this method? Hard to tell what page is supposed to be here...
3135                 $this->parserOutput = $content->getParserOutput( $this->context, $this->revid, $this->parserOptions );
3136                 $time += microtime( true );
3137
3138                 # Timing hack
3139                 if ( $time > 3 ) {
3140                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3141                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3142                 }
3143
3144                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3145                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3146                 }
3147
3148                 // Make sure file cache is not used on uncacheable content.
3149                 // Output that has magic words in it can still use the parser cache
3150                 // (if enabled), though it will generally expire sooner.
3151                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3152                         $wgUseFileCache = false;
3153                 }
3154
3155                 if ( $isCurrent ) {
3156                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3157                 }
3158
3159                 return true;
3160         }
3161
3162         /**
3163          * @return bool
3164          */
3165         function getCachedWork() {
3166                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3167
3168                 if ( $this->parserOutput === false ) {
3169                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3170                         return false;
3171                 } else {
3172                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3173                         return true;
3174                 }
3175         }
3176
3177         /**
3178          * @return bool
3179          */
3180         function fallback() {
3181                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3182
3183                 if ( $this->parserOutput === false ) {
3184                         wfDebugLog( 'dirty', "dirty missing\n" );
3185                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3186                         return false;
3187                 } else {
3188                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3189                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3190                         $this->isDirty = true;
3191                         return true;
3192                 }
3193         }
3194
3195         /**
3196          * @param $status Status
3197          * @return bool
3198          */
3199         function error( $status ) {
3200                 $this->error = $status;
3201                 return false;
3202         }
3203 }