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