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                 return true;
 759         }
 760
 761         /**
 762          * Insert a new empty page record for this article.
 763          * This *must* be followed up by creating a revision
 764          * and running $this->updateRevisionOn( ... );
 765          * or else the record will be left in a funky state.
 766          * Best if all done inside a transaction.
 767          *
 768          * @param $dbw DatabaseBase
 769          * @return int The newly created page_id key, or false if the title already existed
 770          */
 771         public function insertOn( $dbw ) {
 772                 wfProfileIn( __METHOD__ );
 773
 774                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 775                 $dbw->insert( 'page', array(
 776                         'page_id'           => $page_id,
 777                         'page_namespace'    => $this->mTitle->getNamespace(),
 778                         'page_title'        => $this->mTitle->getDBkey(),
 779                         'page_counter'      => 0,
 780                         'page_restrictions' => '',
 781                         'page_is_redirect'  => 0, # Will set this shortly...
 782                         'page_is_new'       => 1,
 783                         'page_random'       => wfRandom(),
 784                         'page_touched'      => $dbw->timestamp(),
 785                         'page_latest'       => 0, # Fill this in shortly...
 786                         'page_len'          => 0, # Fill this in shortly...
 787                 ), __METHOD__, 'IGNORE' );
 788
 789                 $affected = $dbw->affectedRows();
 790
 791                 if ( $affected ) {
 792                         $newid = $dbw->insertId();
 793                         $this->mTitle->resetArticleID( $newid );
 794                 }
 795                 wfProfileOut( __METHOD__ );
 796
 797                 return $affected ? $newid : false;
 798         }
 799
 800         /**
 801          * Update the page record to point to a newly saved revision.
 802          *
 803          * @param $dbw DatabaseBase: object
 804          * @param $revision Revision: For ID number, and text used to set
 805          *                  length and redirect status fields
 806          * @param $lastRevision Integer: if given, will not overwrite the page field
 807          *                      when different from the currently set value.
 808          *                      Giving 0 indicates the new page flag should be set
 809          *                      on.
 810          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 811          *                           removing rows in redirect table.
 812          * @return bool true on success, false on failure
 813          * @private
 814          */
 815         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 816                 wfProfileIn( __METHOD__ );
 817
 818                 $text = $revision->getText();
 819                 $len = strlen( $text );
 820                 $rt = Title::newFromRedirectRecurse( $text );
 821
 822                 $conditions = array( 'page_id' => $this->getId() );
 823
 824                 if ( !is_null( $lastRevision ) ) {
 825                         # An extra check against threads stepping on each other
 826                         $conditions['page_latest'] = $lastRevision;
 827                 }
 828
 829                 $now = wfTimestampNow();
 830                 $dbw->update( 'page',
 831                         array( /* SET */
 832                                 'page_latest'      => $revision->getId(),
 833                                 'page_touched'     => $dbw->timestamp( $now ),
 834                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 835                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 836                                 'page_len'         => $len,
 837                         ),
 838                         $conditions,
 839                         __METHOD__ );
 840
 841                 $result = $dbw->affectedRows() != 0;
 842                 if ( $result ) {
 843                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 844                         $this->setLastEdit( $revision );
 845                         $this->setCachedLastEditTime( $now );
 846                         $this->mLatest = $revision->getId();
 847                         $this->mIsRedirect = (bool)$rt;
 848                         # Update the LinkCache.
 849                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
 850                 }
 851
 852                 wfProfileOut( __METHOD__ );
 853                 return $result;
 854         }
 855
 856         /**
 857          * Get the cached timestamp for the last time the page changed.
 858          * This is only used to help handle slave lag by comparing to page_touched.
 859          * @return string MW timestamp
 860          */
 861         protected function getCachedLastEditTime() {
 862                 global $wgMemc;
 863                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 864                 return $wgMemc->get( $key );
 865         }
 866
 867         /**
 868          * Set the cached timestamp for the last time the page changed.
 869          * This is only used to help handle slave lag by comparing to page_touched.
 870          * @param $timestamp string
 871          * @return void
 872          */
 873         public function setCachedLastEditTime( $timestamp ) {
 874                 global $wgMemc;
 875                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 876                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 877         }
 878
 879         /**
 880          * Add row to the redirect table if this is a redirect, remove otherwise.
 881          *
 882          * @param $dbw DatabaseBase
 883          * @param $redirectTitle Title object pointing to the redirect target,
 884          *                       or NULL if this is not a redirect
 885          * @param $lastRevIsRedirect If given, will optimize adding and
 886          *                           removing rows in redirect table.
 887          * @return bool true on success, false on failure
 888          * @private
 889          */
 890         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 891                 // Always update redirects (target link might have changed)
 892                 // Update/Insert if we don't know if the last revision was a redirect or not
 893                 // Delete if changing from redirect to non-redirect
 894                 $isRedirect = !is_null( $redirectTitle );
 895
 896                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 897                         return true;
 898                 }
 899
 900                 wfProfileIn( __METHOD__ );
 901                 if ( $isRedirect ) {
 902                         $this->insertRedirectEntry( $redirectTitle );
 903                 } else {
 904                         // This is not a redirect, remove row from redirect table
 905                         $where = array( 'rd_from' => $this->getId() );
 906                         $dbw->delete( 'redirect', $where, __METHOD__ );
 907                 }
 908
 909                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 910                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 911                 }
 912                 wfProfileOut( __METHOD__ );
 913
 914                 return ( $dbw->affectedRows() != 0 );
 915         }
 916
 917         /**
 918          * If the given revision is newer than the currently set page_latest,
 919          * update the page record. Otherwise, do nothing.
 920          *
 921          * @param $dbw Database object
 922          * @param $revision Revision object
 923          * @return mixed
 924          */
 925         public function updateIfNewerOn( $dbw, $revision ) {
 926                 wfProfileIn( __METHOD__ );
 927
 928                 $row = $dbw->selectRow(
 929                         array( 'revision', 'page' ),
 930                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 931                         array(
 932                                 'page_id' => $this->getId(),
 933                                 'page_latest=rev_id' ),
 934                         __METHOD__ );
 935
 936                 if ( $row ) {
 937                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 938                                 wfProfileOut( __METHOD__ );
 939                                 return false;
 940                         }
 941                         $prev = $row->rev_id;
 942                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 943                 } else {
 944                         # No or missing previous revision; mark the page as new
 945                         $prev = 0;
 946                         $lastRevIsRedirect = null;
 947                 }
 948
 949                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 950
 951                 wfProfileOut( __METHOD__ );
 952                 return $ret;
 953         }
 954
 955         /**
 956          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 957          * @param $text String: new text of the section
 958          * @param $summary String: new section's subject, only if $section is 'new'
 959          * @param $edittime String: revision timestamp or null to use the current revision
 960          * @return string Complete article text, or null if error
 961          */
 962         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 963                 wfProfileIn( __METHOD__ );
 964
 965                 if ( strval( $section ) == '' ) {
 966                         // Whole-page edit; let the whole text through
 967                 } else {
 968                         if ( is_null( $edittime ) ) {
 969                                 $rev = Revision::newFromTitle( $this->mTitle );
 970                         } else {
 971                                 $dbw = wfGetDB( DB_MASTER );
 972                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 973                         }
 974
 975                         if ( !$rev ) {
 976                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 977                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 978                                 wfProfileOut( __METHOD__ );
 979                                 return null;
 980                         }
 981
 982                         $oldtext = $rev->getText();
 983
 984                         if ( $section == 'new' ) {
 985                                 # Inserting a new section
 986                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 987                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
 988                                         $text = strlen( trim( $oldtext ) ) > 0
 989                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 990                                                 : "{$subject}{$text}";
 991                                 }
 992                         } else {
 993                                 # Replacing an existing section; roll out the big guns
 994                                 global $wgParser;
 995
 996                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 997                         }
 998                 }
 999
1000                 wfProfileOut( __METHOD__ );
1001                 return $text;
1002         }
1003
1004         /**
1005          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1006          * @param $flags Int
1007          * @return Int updated $flags
1008          */
1009         function checkFlags( $flags ) {
1010                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1011                         if ( $this->mTitle->getArticleID() ) {
1012                                 $flags |= EDIT_UPDATE;
1013                         } else {
1014                                 $flags |= EDIT_NEW;
1015                         }
1016                 }
1017
1018                 return $flags;
1019         }
1020
1021         /**
1022          * Change an existing article or create a new article. Updates RC and all necessary caches,
1023          * optionally via the deferred update array.
1024          *
1025          * @param $text String: new text
1026          * @param $summary String: edit summary
1027          * @param $flags Integer bitfield:
1028          *      EDIT_NEW
1029          *          Article is known or assumed to be non-existent, create a new one
1030          *      EDIT_UPDATE
1031          *          Article is known or assumed to be pre-existing, update it
1032          *      EDIT_MINOR
1033          *          Mark this edit minor, if the user is allowed to do so
1034          *      EDIT_SUPPRESS_RC
1035          *          Do not log the change in recentchanges
1036          *      EDIT_FORCE_BOT
1037          *          Mark the edit a "bot" edit regardless of user rights
1038          *      EDIT_DEFER_UPDATES
1039          *          Defer some of the updates until the end of index.php
1040          *      EDIT_AUTOSUMMARY
1041          *          Fill in blank summaries with generated text where possible
1042          *
1043          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1044          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1045          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1046          * edit-already-exists error will be returned. These two conditions are also possible with
1047          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1048          *
1049          * @param $baseRevId the revision ID this edit was based off, if any
1050          * @param $user User the user doing the edit
1051          *
1052          * @return Status object. Possible errors:
1053          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1054          *     edit-gone-missing:       In update mode, but the article didn't exist
1055          *     edit-conflict:           In update mode, the article changed unexpectedly
1056          *     edit-no-change:          Warning that the text was the same as before
1057          *     edit-already-exists:     In creation mode, but the article already exists
1058          *
1059          *  Extensions may define additional errors.
1060          *
1061          *  $return->value will contain an associative array with members as follows:
1062          *     new:                     Boolean indicating if the function attempted to create a new article
1063          *     revision:                The revision object for the inserted revision, or null
1064          *
1065          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1066          */
1067         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1068                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1069
1070                 # Low-level sanity check
1071                 if ( $this->mTitle->getText() === '' ) {
1072                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1073                 }
1074
1075                 wfProfileIn( __METHOD__ );
1076
1077                 $user = is_null( $user ) ? $wgUser : $user;
1078                 $status = Status::newGood( array() );
1079
1080                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1081                 $this->loadPageData( 'fromdbmaster' );
1082
1083                 $flags = $this->checkFlags( $flags );
1084
1085                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1086                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1087                 {
1088                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1089
1090                         if ( $status->isOK() ) {
1091                                 $status->fatal( 'edit-hook-aborted' );
1092                         }
1093
1094                         wfProfileOut( __METHOD__ );
1095                         return $status;
1096                 }
1097
1098                 # Silently ignore EDIT_MINOR if not allowed
1099                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1100                 $bot = $flags & EDIT_FORCE_BOT;
1101
1102                 $oldtext = $this->getRawText(); // current revision
1103                 $oldsize = strlen( $oldtext );
1104                 $oldid = $this->getLatest();
1105                 $oldIsRedirect = $this->isRedirect();
1106                 $oldcountable = $this->isCountable();
1107
1108                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1109                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1110                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1111                 }
1112
1113                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1114                 $text = $editInfo->pst;
1115                 $newsize = strlen( $text );
1116
1117                 $dbw = wfGetDB( DB_MASTER );
1118                 $now = wfTimestampNow();
1119                 $this->mTimestamp = $now;
1120
1121                 if ( $flags & EDIT_UPDATE ) {
1122                         # Update article, but only if changed.
1123                         $status->value['new'] = false;
1124
1125                         # Make sure the revision is either completely inserted or not inserted at all
1126                         if ( !$wgDBtransactions ) {
1127                                 $userAbort = ignore_user_abort( true );
1128                         }
1129
1130                         $revision = new Revision( array(
1131                                 'page'       => $this->getId(),
1132                                 'comment'    => $summary,
1133                                 'minor_edit' => $isminor,
1134                                 'text'       => $text,
1135                                 'parent_id'  => $oldid,
1136                                 'user'       => $user->getId(),
1137                                 'user_text'  => $user->getName(),
1138                                 'timestamp'  => $now
1139                         ) );
1140
1141                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1142
1143                         if ( $changed ) {
1144                                 if ( !$this->mLatest ) {
1145                                         # Article gone missing
1146                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1147                                         $status->fatal( 'edit-gone-missing' );
1148
1149                                         wfProfileOut( __METHOD__ );
1150                                         return $status;
1151                                 }
1152
1153                                 $dbw->begin();
1154                                 $revisionId = $revision->insertOn( $dbw );
1155
1156                                 # Update page
1157                                 #
1158                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1159                                 # during the course of this function. This makes sure that EditPage can detect
1160                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1161                                 # before this function is called. A previous function used a separate query, this
1162                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1163                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1164
1165                                 if ( !$ok ) {
1166                                         /* Belated edit conflict! Run away!! */
1167                                         $status->fatal( 'edit-conflict' );
1168
1169                                         # Delete the invalid revision if the DB is not transactional
1170                                         if ( !$wgDBtransactions ) {
1171                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1172                                         }
1173
1174                                         $revisionId = 0;
1175                                         $dbw->rollback();
1176                                 } else {
1177                                         global $wgUseRCPatrol;
1178                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1179                                         # Update recentchanges
1180                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1181                                                 # Mark as patrolled if the user can do so
1182                                                 $patrolled = $wgUseRCPatrol && !count(
1183                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1184                                                 # Add RC row to the DB
1185                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1186                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1187                                                         $revisionId, $patrolled
1188                                                 );
1189
1190                                                 # Log auto-patrolled edits
1191                                                 if ( $patrolled ) {
1192                                                         PatrolLog::record( $rc, true );
1193                                                 }
1194                                         }
1195                                         $user->incEditCount();
1196                                         $dbw->commit();
1197                                 }
1198                         }
1199
1200                         if ( !$wgDBtransactions ) {
1201                                 ignore_user_abort( $userAbort );
1202                         }
1203
1204                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1205                         if ( !$status->isOK() ) {
1206                                 wfProfileOut( __METHOD__ );
1207                                 return $status;
1208                         }
1209
1210                         # Update links tables, site stats, etc.
1211                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1212                                 'oldcountable' => $oldcountable ) );
1213
1214                         if ( !$changed ) {
1215                                 $status->warning( 'edit-no-change' );
1216                                 $revision = null;
1217                                 // Keep the same revision ID, but do some updates on it
1218                                 $revisionId = $this->getLatest();
1219                                 // Update page_touched, this is usually implicit in the page update
1220                                 // Other cache updates are done in onArticleEdit()
1221                                 $this->mTitle->invalidateCache();
1222                         }
1223                 } else {
1224                         # Create new article
1225                         $status->value['new'] = true;
1226
1227                         $dbw->begin();
1228
1229                         # Add the page record; stake our claim on this title!
1230                         # This will return false if the article already exists
1231                         $newid = $this->insertOn( $dbw );
1232
1233                         if ( $newid === false ) {
1234                                 $dbw->rollback();
1235                                 $status->fatal( 'edit-already-exists' );
1236
1237                                 wfProfileOut( __METHOD__ );
1238                                 return $status;
1239                         }
1240
1241                         # Save the revision text...
1242                         $revision = new Revision( array(
1243                                 'page'       => $newid,
1244                                 'comment'    => $summary,
1245                                 'minor_edit' => $isminor,
1246                                 'text'       => $text,
1247                                 'user'       => $user->getId(),
1248                                 'user_text'  => $user->getName(),
1249                                 'timestamp'  => $now
1250                         ) );
1251                         $revisionId = $revision->insertOn( $dbw );
1252
1253                         # Update the page record with revision data
1254                         $this->updateRevisionOn( $dbw, $revision, 0 );
1255
1256                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1257
1258                         # Update recentchanges
1259                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1260                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1261
1262                                 # Mark as patrolled if the user can do so
1263                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1264                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1265                                 # Add RC row to the DB
1266                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1267                                         '', strlen( $text ), $revisionId, $patrolled );
1268
1269                                 # Log auto-patrolled edits
1270                                 if ( $patrolled ) {
1271                                         PatrolLog::record( $rc, true );
1272                                 }
1273                         }
1274                         $user->incEditCount();
1275                         $dbw->commit();
1276
1277                         # Update links, etc.
1278                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1279
1280                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1281                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1282                 }
1283
1284                 # Do updates right now unless deferral was requested
1285                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1286                         DeferredUpdates::doUpdates();
1287                 }
1288
1289                 // Return the new revision (or null) to the caller
1290                 $status->value['revision'] = $revision;
1291
1292                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1293                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1294
1295                 # Promote user to any groups they meet the criteria for
1296                 $user->addAutopromoteOnceGroups( 'onEdit' );
1297
1298                 wfProfileOut( __METHOD__ );
1299                 return $status;
1300         }
1301
1302         /**
1303          * Update the article's restriction field, and leave a log entry.
1304          *
1305          * @todo: seperate the business/permission stuff out from backend code
1306          *
1307          * @param $limit Array: set of restriction keys
1308          * @param $reason String
1309          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1310          * @param $expiry Array: per restriction type expiration
1311          * @param $user User The user updating the restrictions
1312          * @return bool true on success
1313          */
1314         public function updateRestrictions(
1315                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1316         ) {
1317                 global $wgUser, $wgContLang;
1318                 $user = is_null( $user ) ? $wgUser : $user;
1319
1320                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1321
1322                 $id = $this->mTitle->getArticleID();
1323
1324                 if ( $id <= 0 ) {
1325                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1326                         return false;
1327                 }
1328
1329                 if ( wfReadOnly() ) {
1330                         wfDebug( "updateRestrictions failed: read-only\n" );
1331                         return false;
1332                 }
1333
1334                 if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
1335                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1336                         return false;
1337                 }
1338
1339                 if ( !$cascade ) {
1340                         $cascade = false;
1341                 }
1342
1343                 // Take this opportunity to purge out expired restrictions
1344                 Title::purgeExpiredRestrictions();
1345
1346                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1347                 # we expect a single selection, but the schema allows otherwise.
1348                 $current = array();
1349                 $updated = self::flattenRestrictions( $limit );
1350                 $changed = false;
1351
1352                 foreach ( $restrictionTypes as $action ) {
1353                         if ( isset( $expiry[$action] ) ) {
1354                                 # Get current restrictions on $action
1355                                 $aLimits = $this->mTitle->getRestrictions( $action );
1356                                 $current[$action] = implode( '', $aLimits );
1357                                 # Are any actual restrictions being dealt with here?
1358                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1359
1360                                 # If something changed, we need to log it. Checking $aRChanged
1361                                 # assures that "unprotecting" a page that is not protected does
1362                                 # not log just because the expiry was "changed".
1363                                 if ( $aRChanged &&
1364                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1365                                 {
1366                                         $changed = true;
1367                                 }
1368                         }
1369                 }
1370
1371                 $current = self::flattenRestrictions( $current );
1372
1373                 $changed = ( $changed || $current != $updated );
1374                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1375                 $protect = ( $updated != '' );
1376
1377                 # If nothing's changed, do nothing
1378                 if ( $changed ) {
1379                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1380                                 $dbw = wfGetDB( DB_MASTER );
1381
1382                                 # Prepare a null revision to be added to the history
1383                                 $modified = $current != '' && $protect;
1384
1385                                 if ( $protect ) {
1386                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1387                                 } else {
1388                                         $comment_type = 'unprotectedarticle';
1389                                 }
1390
1391                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1392
1393                                 # Only restrictions with the 'protect' right can cascade...
1394                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1395                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1396
1397                                 # The schema allows multiple restrictions
1398                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1399                                         $cascade = false;
1400                                 }
1401
1402                                 $cascade_description = '';
1403
1404                                 if ( $cascade ) {
1405                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1406                                 }
1407
1408                                 if ( $reason ) {
1409                                         $comment .= ": $reason";
1410                                 }
1411
1412                                 $editComment = $comment;
1413                                 $encodedExpiry = array();
1414                                 $protect_description = '';
1415                                 foreach ( $limit as $action => $restrictions ) {
1416                                         if ( !isset( $expiry[$action] ) )
1417                                                 $expiry[$action] = $dbw->getInfinity();
1418
1419                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1420                                         if ( $restrictions != '' ) {
1421                                                 $protect_description .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1422                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1423                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1424                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1425                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1426                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1427                                                 } else {
1428                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1429                                                 }
1430
1431                                                 $protect_description .= ') ';
1432                                         }
1433                                 }
1434                                 $protect_description = trim( $protect_description );
1435
1436                                 if ( $protect_description && $protect ) {
1437                                         $editComment .= " ($protect_description)";
1438                                 }
1439
1440                                 if ( $cascade ) {
1441                                         $editComment .= "$cascade_description";
1442                                 }
1443
1444                                 # Update restrictions table
1445                                 foreach ( $limit as $action => $restrictions ) {
1446                                         if ( $restrictions != '' ) {
1447                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1448                                                         array( 'pr_page' => $id,
1449                                                                 'pr_type' => $action,
1450                                                                 'pr_level' => $restrictions,
1451                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1452                                                                 'pr_expiry' => $encodedExpiry[$action]
1453                                                         ),
1454                                                         __METHOD__
1455                                                 );
1456                                         } else {
1457                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1458                                                         'pr_type' => $action ), __METHOD__ );
1459                                         }
1460                                 }
1461
1462                                 # Insert a null revision
1463                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1464                                 $nullRevId = $nullRevision->insertOn( $dbw );
1465
1466                                 $latest = $this->getLatest();
1467                                 # Update page record
1468                                 $dbw->update( 'page',
1469                                         array( /* SET */
1470                                                 'page_touched' => $dbw->timestamp(),
1471                                                 'page_restrictions' => '',
1472                                                 'page_latest' => $nullRevId
1473                                         ), array( /* WHERE */
1474                                                 'page_id' => $id
1475                                         ), __METHOD__
1476                                 );
1477
1478                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1479                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1480
1481                                 # Update the protection log
1482                                 $log = new LogPage( 'protect' );
1483                                 if ( $protect ) {
1484                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1485                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1486                                 } else {
1487                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1488                                 }
1489                         } # End hook
1490                 } # End "changed" check
1491
1492                 return true;
1493         }
1494
1495         /**
1496          * Take an array of page restrictions and flatten it to a string
1497          * suitable for insertion into the page_restrictions field.
1498          * @param $limit Array
1499          * @return String
1500          */
1501         protected static function flattenRestrictions( $limit ) {
1502                 if ( !is_array( $limit ) ) {
1503                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1504                 }
1505
1506                 $bits = array();
1507                 ksort( $limit );
1508
1509                 foreach ( $limit as $action => $restrictions ) {
1510                         if ( $restrictions != '' ) {
1511                                 $bits[] = "$action=$restrictions";
1512                         }
1513                 }
1514
1515                 return implode( ':', $bits );
1516         }
1517
1518         /**
1519          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1520          */
1521         public function isBigDeletion() {
1522                 global $wgDeleteRevisionsLimit;
1523
1524                 if ( $wgDeleteRevisionsLimit ) {
1525                         $revCount = $this->estimateRevisionCount();
1526
1527                         return $revCount > $wgDeleteRevisionsLimit;
1528                 }
1529
1530                 return false;
1531         }
1532
1533         /**
1534          * @return int approximate revision count
1535          */
1536         public function estimateRevisionCount() {
1537                 $dbr = wfGetDB( DB_SLAVE );
1538                 return $dbr->estimateRowCount( 'revision', '*',
1539                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1540         }
1541
1542         /**
1543          * Get the last N authors
1544          * @param $num Integer: number of revisions to get
1545          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1546          * @return array Array of authors, duplicates not removed
1547          */
1548         public function getLastNAuthors( $num, $revLatest = 0 ) {
1549                 wfProfileIn( __METHOD__ );
1550                 // First try the slave
1551                 // If that doesn't have the latest revision, try the master
1552                 $continue = 2;
1553                 $db = wfGetDB( DB_SLAVE );
1554
1555                 do {
1556                         $res = $db->select( array( 'page', 'revision' ),
1557                                 array( 'rev_id', 'rev_user_text' ),
1558                                 array(
1559                                         'page_namespace' => $this->mTitle->getNamespace(),
1560                                         'page_title' => $this->mTitle->getDBkey(),
1561                                         'rev_page = page_id'
1562                                 ), __METHOD__,
1563                                 array(
1564                                         'ORDER BY' => 'rev_timestamp DESC',
1565                                         'LIMIT' => $num
1566                                 )
1567                         );
1568
1569                         if ( !$res ) {
1570                                 wfProfileOut( __METHOD__ );
1571                                 return array();
1572                         }
1573
1574                         $row = $db->fetchObject( $res );
1575
1576                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1577                                 $db = wfGetDB( DB_MASTER );
1578                                 $continue--;
1579                         } else {
1580                                 $continue = 0;
1581                         }
1582                 } while ( $continue );
1583
1584                 $authors = array( $row->rev_user_text );
1585
1586                 foreach ( $res as $row ) {
1587                         $authors[] = $row->rev_user_text;
1588                 }
1589
1590                 wfProfileOut( __METHOD__ );
1591                 return $authors;
1592         }
1593
1594         /**
1595          * Back-end article deletion
1596          * Deletes the article with database consistency, writes logs, purges caches
1597          *
1598          * @param $reason string delete reason for deletion log
1599          * @param $suppress bitfield
1600          *      Revision::DELETED_TEXT
1601          *      Revision::DELETED_COMMENT
1602          *      Revision::DELETED_USER
1603          *      Revision::DELETED_RESTRICTED
1604          * @param $id int article ID
1605          * @param $commit boolean defaults to true, triggers transaction end
1606          * @param &$errors Array of errors to append to
1607          * @param $user User The relevant user
1608          * @return boolean true if successful
1609          */
1610         public function doDeleteArticle(
1611                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1612         ) {
1613                 global $wgUseTrackbacks, $wgUser;
1614                 $user = is_null( $user ) ? $wgUser : $user;
1615
1616                 wfDebug( __METHOD__ . "\n" );
1617
1618                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1619                         return false;
1620                 }
1621                 $dbw = wfGetDB( DB_MASTER );
1622                 $t = $this->mTitle->getDBkey();
1623                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1624
1625                 if ( $t === '' || $id == 0 ) {
1626                         return false;
1627                 }
1628
1629                 DeferredUpdates::addUpdate(
1630                         new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 )
1631                 );
1632
1633                 // Bitfields to further suppress the content
1634                 if ( $suppress ) {
1635                         $bitfield = 0;
1636                         // This should be 15...
1637                         $bitfield |= Revision::DELETED_TEXT;
1638                         $bitfield |= Revision::DELETED_COMMENT;
1639                         $bitfield |= Revision::DELETED_USER;
1640                         $bitfield |= Revision::DELETED_RESTRICTED;
1641                 } else {
1642                         $bitfield = 'rev_deleted';
1643                 }
1644
1645                 $dbw->begin();
1646                 // For now, shunt the revision data into the archive table.
1647                 // Text is *not* removed from the text table; bulk storage
1648                 // is left intact to avoid breaking block-compression or
1649                 // immutable storage schemes.
1650                 //
1651                 // For backwards compatibility, note that some older archive
1652                 // table entries will have ar_text and ar_flags fields still.
1653                 //
1654                 // In the future, we may keep revisions and mark them with
1655                 // the rev_deleted field, which is reserved for this purpose.
1656                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1657                         array(
1658                                 'ar_namespace'  => 'page_namespace',
1659                                 'ar_title'      => 'page_title',
1660                                 'ar_comment'    => 'rev_comment',
1661                                 'ar_user'       => 'rev_user',
1662                                 'ar_user_text'  => 'rev_user_text',
1663                                 'ar_timestamp'  => 'rev_timestamp',
1664                                 'ar_minor_edit' => 'rev_minor_edit',
1665                                 'ar_rev_id'     => 'rev_id',
1666                                 'ar_parent_id'  => 'rev_parent_id',
1667                                 'ar_text_id'    => 'rev_text_id',
1668                                 'ar_text'       => '\'\'', // Be explicit to appease
1669                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1670                                 'ar_len'        => 'rev_len',
1671                                 'ar_page_id'    => 'page_id',
1672                                 'ar_deleted'    => $bitfield,
1673                                 'ar_sha1'       => 'rev_sha1'
1674                         ), array(
1675                                 'page_id' => $id,
1676                                 'page_id = rev_page'
1677                         ), __METHOD__
1678                 );
1679
1680                 # Delete restrictions for it
1681                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1682
1683                 # Now that it's safely backed up, delete it
1684                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1685                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1686
1687                 if ( !$ok ) {
1688                         $dbw->rollback();
1689                         return false;
1690                 }
1691
1692                 # Fix category table counts
1693                 $cats = array();
1694                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1695
1696                 foreach ( $res as $row ) {
1697                         $cats [] = $row->cl_to;
1698                 }
1699
1700                 $this->updateCategoryCounts( array(), $cats );
1701
1702                 # If using cascading deletes, we can skip some explicit deletes
1703                 if ( !$dbw->cascadingDeletes() ) {
1704                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1705
1706                         if ( $wgUseTrackbacks ) {
1707                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1708                         }
1709
1710                         # Delete outgoing links
1711                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
1712                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
1713                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
1714                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
1715                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
1716                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
1717                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
1718                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
1719                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
1720                 }
1721
1722                 # If using cleanup triggers, we can skip some manual deletes
1723                 if ( !$dbw->cleanupTriggers() ) {
1724                         # Clean up recentchanges entries...
1725                         $dbw->delete( 'recentchanges',
1726                                 array( 'rc_type != ' . RC_LOG,
1727                                         'rc_namespace' => $this->mTitle->getNamespace(),
1728                                         'rc_title' => $this->mTitle->getDBkey() ),
1729                                 __METHOD__ );
1730                         $dbw->delete( 'recentchanges',
1731                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1732                                 __METHOD__ );
1733                 }
1734
1735                 # Clear caches
1736                 self::onArticleDelete( $this->mTitle );
1737
1738                 # Clear the cached article id so the interface doesn't act like we exist
1739                 $this->mTitle->resetArticleID( 0 );
1740
1741                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1742                 $logtype = $suppress ? 'suppress' : 'delete';
1743
1744                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
1745                 $logEntry->setPerformer( $user );
1746                 $logEntry->setTarget( $this->mTitle );
1747                 $logEntry->setComment( $reason );
1748                 $logid = $logEntry->insert();
1749                 $logEntry->publish( $logid );
1750
1751                 if ( $commit ) {
1752                         $dbw->commit();
1753                 }
1754
1755                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1756                 return true;
1757         }
1758
1759         /**
1760          * Roll back the most recent consecutive set of edits to a page
1761          * from the same user; fails if there are no eligible edits to
1762          * roll back to, e.g. user is the sole contributor. This function
1763          * performs permissions checks on $user, then calls commitRollback()
1764          * to do the dirty work
1765          *
1766          * @todo: seperate the business/permission stuff out from backend code
1767          *
1768          * @param $fromP String: Name of the user whose edits to rollback.
1769          * @param $summary String: Custom summary. Set to default summary if empty.
1770          * @param $token String: Rollback token.
1771          * @param $bot Boolean: If true, mark all reverted edits as bot.
1772          *
1773          * @param $resultDetails Array: contains result-specific array of additional values
1774          *    'alreadyrolled' : 'current' (rev)
1775          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1776          *
1777          * @param $user User The user performing the rollback
1778          * @return array of errors, each error formatted as
1779          *   array(messagekey, param1, param2, ...).
1780          * On success, the array is empty.  This array can also be passed to
1781          * OutputPage::showPermissionsErrorPage().
1782          */
1783         public function doRollback(
1784                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1785         ) {
1786                 $resultDetails = null;
1787
1788                 # Check permissions
1789                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1790                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1791                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1792
1793                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1794                         $errors[] = array( 'sessionfailure' );
1795                 }
1796
1797                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1798                         $errors[] = array( 'actionthrottledtext' );
1799                 }
1800
1801                 # If there were errors, bail out now
1802                 if ( !empty( $errors ) ) {
1803                         return $errors;
1804                 }
1805
1806                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1807         }
1808
1809         /**
1810          * Backend implementation of doRollback(), please refer there for parameter
1811          * and return value documentation
1812          *
1813          * NOTE: This function does NOT check ANY permissions, it just commits the
1814          * rollback to the DB. Therefore, you should only call this function direct-
1815          * ly if you want to use custom permissions checks. If you don't, use
1816          * doRollback() instead.
1817          * @param $fromP String: Name of the user whose edits to rollback.
1818          * @param $summary String: Custom summary. Set to default summary if empty.
1819          * @param $bot Boolean: If true, mark all reverted edits as bot.
1820          *
1821          * @param $resultDetails Array: contains result-specific array of additional values
1822          * @param $guser User The user performing the rollback
1823          */
1824         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1825                 global $wgUseRCPatrol, $wgContLang;
1826
1827                 $dbw = wfGetDB( DB_MASTER );
1828
1829                 if ( wfReadOnly() ) {
1830                         return array( array( 'readonlytext' ) );
1831                 }
1832
1833                 # Get the last editor
1834                 $current = Revision::newFromTitle( $this->mTitle );
1835                 if ( is_null( $current ) ) {
1836                         # Something wrong... no page?
1837                         return array( array( 'notanarticle' ) );
1838                 }
1839
1840                 $from = str_replace( '_', ' ', $fromP );
1841                 # User name given should match up with the top revision.
1842                 # If the user was deleted then $from should be empty.
1843                 if ( $from != $current->getUserText() ) {
1844                         $resultDetails = array( 'current' => $current );
1845                         return array( array( 'alreadyrolled',
1846                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1847                                 htmlspecialchars( $fromP ),
1848                                 htmlspecialchars( $current->getUserText() )
1849                         ) );
1850                 }
1851
1852                 # Get the last edit not by this guy...
1853                 # Note: these may not be public values
1854                 $user = intval( $current->getRawUser() );
1855                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1856                 $s = $dbw->selectRow( 'revision',
1857                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1858                         array( 'rev_page' => $current->getPage(),
1859                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1860                         ), __METHOD__,
1861                         array( 'USE INDEX' => 'page_timestamp',
1862                                 'ORDER BY' => 'rev_timestamp DESC' )
1863                         );
1864                 if ( $s === false ) {
1865                         # No one else ever edited this page
1866                         return array( array( 'cantrollback' ) );
1867                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1868                         # Only admins can see this text
1869                         return array( array( 'notvisiblerev' ) );
1870                 }
1871
1872                 $set = array();
1873                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1874                         # Mark all reverted edits as bot
1875                         $set['rc_bot'] = 1;
1876                 }
1877
1878                 if ( $wgUseRCPatrol ) {
1879                         # Mark all reverted edits as patrolled
1880                         $set['rc_patrolled'] = 1;
1881                 }
1882
1883                 if ( count( $set ) ) {
1884                         $dbw->update( 'recentchanges', $set,
1885                                 array( /* WHERE */
1886                                         'rc_cur_id' => $current->getPage(),
1887                                         'rc_user_text' => $current->getUserText(),
1888                                         "rc_timestamp > '{$s->rev_timestamp}'",
1889                                 ), __METHOD__
1890                         );
1891                 }
1892
1893                 # Generate the edit summary if necessary
1894                 $target = Revision::newFromId( $s->rev_id );
1895                 if ( empty( $summary ) ) {
1896                         if ( $from == '' ) { // no public user name
1897                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1898                         } else {
1899                                 $summary = wfMsgForContent( 'revertpage' );
1900                         }
1901                 }
1902
1903                 # Allow the custom summary to use the same args as the default message
1904                 $args = array(
1905                         $target->getUserText(), $from, $s->rev_id,
1906                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1907                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1908                 );
1909                 $summary = wfMsgReplaceArgs( $summary, $args );
1910
1911                 # Save
1912                 $flags = EDIT_UPDATE;
1913
1914                 if ( $guser->isAllowed( 'minoredit' ) ) {
1915                         $flags |= EDIT_MINOR;
1916                 }
1917
1918                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1919                         $flags |= EDIT_FORCE_BOT;
1920                 }
1921
1922                 # Actually store the edit
1923                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1924                 if ( !empty( $status->value['revision'] ) ) {
1925                         $revId = $status->value['revision']->getId();
1926                 } else {
1927                         $revId = false;
1928                 }
1929
1930                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1931
1932                 $resultDetails = array(
1933                         'summary' => $summary,
1934                         'current' => $current,
1935                         'target'  => $target,
1936                         'newid'   => $revId
1937                 );
1938
1939                 return array();
1940         }
1941
1942         /**
1943          * Do standard deferred updates after page view
1944          * @param $user User The relevant user
1945          */
1946         public function doViewUpdates( User $user ) {
1947                 global $wgDisableCounters;
1948                 if ( wfReadOnly() ) {
1949                         return;
1950                 }
1951
1952                 # Don't update page view counters on views from bot users (bug 14044)
1953                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1954                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1955                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1956                 }
1957
1958                 # Update newtalk / watchlist notification status
1959                 $user->clearNotification( $this->mTitle );
1960         }
1961
1962         /**
1963          * Prepare text which is about to be saved.
1964          * Returns a stdclass with source, pst and output members
1965          */
1966         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1967                 global $wgParser, $wgContLang, $wgUser;
1968                 $user = is_null( $user ) ? $wgUser : $user;
1969                 // @TODO fixme: check $user->getId() here???
1970                 if ( $this->mPreparedEdit
1971                         && $this->mPreparedEdit->newText == $text
1972                         && $this->mPreparedEdit->revid == $revid
1973                 ) {
1974                         // Already prepared
1975                         return $this->mPreparedEdit;
1976                 }
1977
1978                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1979                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1980
1981                 $edit = (object)array();
1982                 $edit->revid = $revid;
1983                 $edit->newText = $text;
1984                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
1985                 $edit->popts = $this->makeParserOptions( 'canonical' );
1986                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1987                 $edit->oldText = $this->getRawText();
1988
1989                 $this->mPreparedEdit = $edit;
1990
1991                 return $edit;
1992         }
1993
1994         /**
1995          * Do standard deferred updates after page edit.
1996          * Update links tables, site stats, search index and message cache.
1997          * Purges pages that include this page if the text was changed here.
1998          * Every 100th edit, prune the recent changes table.
1999          *
2000          * @private
2001          * @param $revision Revision object
2002          * @param $user User object that did the revision
2003          * @param $options Array of options, following indexes are used:
2004          * - changed: boolean, whether the revision changed the content (default true)
2005          * - created: boolean, whether the revision created the page (default false)
2006          * - oldcountable: boolean or null (default null):
2007          *   - boolean: whether the page was counted as an article before that
2008          *     revision, only used in changed is true and created is false
2009          *   - null: don't change the article count
2010          */
2011         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2012                 global $wgEnableParserCache;
2013
2014                 wfProfileIn( __METHOD__ );
2015
2016                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2017                 $text = $revision->getText();
2018
2019                 # Parse the text
2020                 # Be careful not to double-PST: $text is usually already PST-ed once
2021                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2022                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2023                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
2024                 } else {
2025                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2026                         $editInfo = $this->mPreparedEdit;
2027                 }
2028
2029                 # Save it to the parser cache
2030                 if ( $wgEnableParserCache ) {
2031                         $parserCache = ParserCache::singleton();
2032                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2033                 }
2034
2035                 # Update the links tables
2036                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2037                 $u->doUpdate();
2038
2039                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2040
2041                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2042                         if ( 0 == mt_rand( 0, 99 ) ) {
2043                                 // Flush old entries from the `recentchanges` table; we do this on
2044                                 // random requests so as to avoid an increase in writes for no good reason
2045                                 global $wgRCMaxAge;
2046
2047                                 $dbw = wfGetDB( DB_MASTER );
2048                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2049                                 $dbw->delete(
2050                                         'recentchanges',
2051                                         array( "rc_timestamp < '$cutoff'" ),
2052                                         __METHOD__
2053                                 );
2054                         }
2055                 }
2056
2057                 $id = $this->getId();
2058                 $title = $this->mTitle->getPrefixedDBkey();
2059                 $shortTitle = $this->mTitle->getDBkey();
2060
2061                 if ( 0 == $id ) {
2062                         wfProfileOut( __METHOD__ );
2063                         return;
2064                 }
2065
2066                 if ( !$options['changed'] ) {
2067                         $good = 0;
2068                         $total = 0;
2069                 } elseif ( $options['created'] ) {
2070                         $good = (int)$this->isCountable( $editInfo );
2071                         $total = 1;
2072                 } elseif ( $options['oldcountable'] !== null ) {
2073                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2074                         $total = 0;
2075                 } else {
2076                         $good = 0;
2077                         $total = 0;
2078                 }
2079
2080                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2081                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
2082
2083                 # If this is another user's talk page, update newtalk.
2084                 # Don't do this if $options['changed'] = false (null-edits) nor if
2085                 # it's a minor edit and the user doesn't want notifications for those.
2086                 if ( $options['changed']
2087                         && $this->mTitle->getNamespace() == NS_USER_TALK
2088                         && $shortTitle != $user->getTitleKey()
2089                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2090                 ) {
2091                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2092                                 $other = User::newFromName( $shortTitle, false );
2093                                 if ( !$other ) {
2094                                         wfDebug( __METHOD__ . ": invalid username\n" );
2095                                 } elseif ( User::isIP( $shortTitle ) ) {
2096                                         // An anonymous user
2097                                         $other->setNewtalk( true );
2098                                 } elseif ( $other->isLoggedIn() ) {
2099                                         $other->setNewtalk( true );
2100                                 } else {
2101                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2102                                 }
2103                         }
2104                 }
2105
2106                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2107                         MessageCache::singleton()->replace( $shortTitle, $text );
2108                 }
2109
2110                 if( $options['created'] ) {
2111                         self::onArticleCreate( $this->mTitle );
2112                 } else {
2113                         self::onArticleEdit( $this->mTitle );
2114                 }
2115
2116                 wfProfileOut( __METHOD__ );
2117         }
2118
2119         /**
2120          * Perform article updates on a special page creation.
2121          *
2122          * @param $rev Revision object
2123          *
2124          * @todo This is a shitty interface function. Kill it and replace the
2125          * other shitty functions like doEditUpdates and such so it's not needed
2126          * anymore.
2127          * @deprecated since 1.18, use doEditUpdates()
2128          */
2129         public function createUpdates( $rev ) {
2130                 global $wgUser;
2131                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2132         }
2133
2134         /**
2135          * This function is called right before saving the wikitext,
2136          * so we can do things like signatures and links-in-context.
2137          *
2138          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2139          * @param $text String article contents
2140          * @param $user User object: user doing the edit
2141          * @param $popts ParserOptions object: parser options, default options for
2142          *               the user loaded if null given
2143          * @return string article contents with altered wikitext markup (signatures
2144          *      converted, {{subst:}}, templates, etc.)
2145          */
2146         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2147                 global $wgParser, $wgUser;
2148
2149                 wfDeprecated( __METHOD__ );
2150
2151                 $user = is_null( $user ) ? $wgUser : $user;
2152
2153                 if ( $popts === null ) {
2154                         $popts = ParserOptions::newFromUser( $user );
2155                 }
2156
2157                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2158         }
2159
2160         /**
2161          * Loads page_touched and returns a value indicating if it should be used
2162          * @return boolean true if not a redirect
2163          */
2164         public function checkTouched() {
2165                 if ( !$this->mDataLoaded ) {
2166                         $this->loadPageData();
2167                 }
2168                 return !$this->mIsRedirect;
2169         }
2170
2171         /**
2172          * Get the page_touched field
2173          * @return string containing GMT timestamp
2174          */
2175         public function getTouched() {
2176                 if ( !$this->mDataLoaded ) {
2177                         $this->loadPageData();
2178                 }
2179                 return $this->mTouched;
2180         }
2181
2182         /**
2183          * Get the page_latest field
2184          * @return integer rev_id of current revision
2185          */
2186         public function getLatest() {
2187                 if ( !$this->mDataLoaded ) {
2188                         $this->loadPageData();
2189                 }
2190                 return (int)$this->mLatest;
2191         }
2192
2193         /**
2194          * Edit an article without doing all that other stuff
2195          * The article must already exist; link tables etc
2196          * are not updated, caches are not flushed.
2197          *
2198          * @param $text String: text submitted
2199          * @param $user User The relevant user
2200          * @param $comment String: comment submitted
2201          * @param $minor Boolean: whereas it's a minor modification
2202          */
2203         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2204                 wfProfileIn( __METHOD__ );
2205
2206                 $dbw = wfGetDB( DB_MASTER );
2207                 $revision = new Revision( array(
2208                         'page'       => $this->getId(),
2209                         'text'       => $text,
2210                         'comment'    => $comment,
2211                         'minor_edit' => $minor ? 1 : 0,
2212                 ) );
2213                 $revision->insertOn( $dbw );
2214                 $this->updateRevisionOn( $dbw, $revision );
2215
2216                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2217
2218                 wfProfileOut( __METHOD__ );
2219         }
2220
2221         /**
2222          * The onArticle*() functions are supposed to be a kind of hooks
2223          * which should be called whenever any of the specified actions
2224          * are done.
2225          *
2226          * This is a good place to put code to clear caches, for instance.
2227          *
2228          * This is called on page move and undelete, as well as edit
2229          *
2230          * @param $title Title object
2231          */
2232         public static function onArticleCreate( $title ) {
2233                 # Update existence markers on article/talk tabs...
2234                 if ( $title->isTalkPage() ) {
2235                         $other = $title->getSubjectPage();
2236                 } else {
2237                         $other = $title->getTalkPage();
2238                 }
2239
2240                 $other->invalidateCache();
2241                 $other->purgeSquid();
2242
2243                 $title->touchLinks();
2244                 $title->purgeSquid();
2245                 $title->deleteTitleProtection();
2246         }
2247
2248         /**
2249          * Clears caches when article is deleted
2250          *
2251          * @param $title Title
2252          */
2253         public static function onArticleDelete( $title ) {
2254                 # Update existence markers on article/talk tabs...
2255                 if ( $title->isTalkPage() ) {
2256                         $other = $title->getSubjectPage();
2257                 } else {
2258                         $other = $title->getTalkPage();
2259                 }
2260
2261                 $other->invalidateCache();
2262                 $other->purgeSquid();
2263
2264                 $title->touchLinks();
2265                 $title->purgeSquid();
2266
2267                 # File cache
2268                 HTMLFileCache::clearFileCache( $title );
2269
2270                 # Messages
2271                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2272                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2273                 }
2274
2275                 # Images
2276                 if ( $title->getNamespace() == NS_FILE ) {
2277                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2278                         $update->doUpdate();
2279                 }
2280
2281                 # User talk pages
2282                 if ( $title->getNamespace() == NS_USER_TALK ) {
2283                         $user = User::newFromName( $title->getText(), false );
2284                         $user->setNewtalk( false );
2285                 }
2286
2287                 # Image redirects
2288                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2289         }
2290
2291         /**
2292          * Purge caches on page update etc
2293          *
2294          * @param $title Title object
2295          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2296          */
2297         public static function onArticleEdit( $title ) {
2298                 // Invalidate caches of articles which include this page
2299                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2300
2301
2302                 // Invalidate the caches of all pages which redirect here
2303                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2304
2305                 # Purge squid for this page only
2306                 $title->purgeSquid();
2307
2308                 # Clear file cache for this page only
2309                 HTMLFileCache::clearFileCache( $title );
2310         }
2311
2312         /**#@-*/
2313
2314         /**
2315          * Return a list of templates used by this article.
2316          * Uses the templatelinks table
2317          *
2318          * @return Array of Title objects
2319          */
2320         public function getUsedTemplates() {
2321                 $result = array();
2322                 $id = $this->mTitle->getArticleID();
2323
2324                 if ( $id == 0 ) {
2325                         return array();
2326                 }
2327
2328                 $dbr = wfGetDB( DB_SLAVE );
2329                 $res = $dbr->select( array( 'templatelinks' ),
2330                         array( 'tl_namespace', 'tl_title' ),
2331                         array( 'tl_from' => $id ),
2332                         __METHOD__ );
2333
2334                 if ( $res !== false ) {
2335                         foreach ( $res as $row ) {
2336                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2337                         }
2338                 }
2339
2340                 return $result;
2341         }
2342
2343         /**
2344          * Returns a list of hidden categories this page is a member of.
2345          * Uses the page_props and categorylinks tables.
2346          *
2347          * @return Array of Title objects
2348          */
2349         public function getHiddenCategories() {
2350                 $result = array();
2351                 $id = $this->mTitle->getArticleID();
2352
2353                 if ( $id == 0 ) {
2354                         return array();
2355                 }
2356
2357                 $dbr = wfGetDB( DB_SLAVE );
2358                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2359                         array( 'cl_to' ),
2360                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2361                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2362                         __METHOD__ );
2363
2364                 if ( $res !== false ) {
2365                         foreach ( $res as $row ) {
2366                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2367                         }
2368                 }
2369
2370                 return $result;
2371         }
2372
2373         /**
2374         * Return an applicable autosummary if one exists for the given edit.
2375         * @param $oldtext String: the previous text of the page.
2376         * @param $newtext String: The submitted text of the page.
2377         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2378         * @return string An appropriate autosummary, or an empty string.
2379         */
2380         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2381                 global $wgContLang;
2382
2383                 # Decide what kind of autosummary is needed.
2384
2385                 # Redirect autosummaries
2386                 $ot = Title::newFromRedirect( $oldtext );
2387                 $rt = Title::newFromRedirect( $newtext );
2388
2389                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2390                         $truncatedtext = $wgContLang->truncate(
2391                                 str_replace( "\n", ' ', $newtext ),
2392                                 max( 0, 250
2393                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2394                                         - strlen( $rt->getFullText() )
2395                                 ) );
2396                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2397                 }
2398
2399                 # New page autosummaries
2400                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2401                         # If they're making a new article, give its text, truncated, in the summary.
2402
2403                         $truncatedtext = $wgContLang->truncate(
2404                                 str_replace( "\n", ' ', $newtext ),
2405                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2406
2407                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2408                 }
2409
2410                 # Blanking autosummaries
2411                 if ( $oldtext != '' && $newtext == '' ) {
2412                         return wfMsgForContent( 'autosumm-blank' );
2413                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2414                         # Removing more than 90% of the article
2415
2416                         $truncatedtext = $wgContLang->truncate(
2417                                 $newtext,
2418                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2419
2420                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2421                 }
2422
2423                 # If we reach this point, there's no applicable autosummary for our case, so our
2424                 # autosummary is empty.
2425                 return '';
2426         }
2427
2428         /**
2429          * Auto-generates a deletion reason
2430          *
2431          * @param &$hasHistory Boolean: whether the page has a history
2432          * @return mixed String containing deletion reason or empty string, or boolean false
2433          *    if no revision occurred
2434          */
2435         public function getAutoDeleteReason( &$hasHistory ) {
2436                 global $wgContLang;
2437
2438                 $dbw = wfGetDB( DB_MASTER );
2439                 // Get the last revision
2440                 $rev = Revision::newFromTitle( $this->getTitle() );
2441
2442                 if ( is_null( $rev ) ) {
2443                         return false;
2444                 }
2445
2446                 // Get the article's contents
2447                 $contents = $rev->getText();
2448                 $blank = false;
2449
2450                 // If the page is blank, use the text from the previous revision,
2451                 // which can only be blank if there's a move/import/protect dummy revision involved
2452                 if ( $contents == '' ) {
2453                         $prev = $rev->getPrevious();
2454
2455                         if ( $prev )    {
2456                                 $contents = $prev->getText();
2457                                 $blank = true;
2458                         }
2459                 }
2460
2461                 // Find out if there was only one contributor
2462                 // Only scan the last 20 revisions
2463                 $res = $dbw->select( 'revision', 'rev_user_text',
2464                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2465                         __METHOD__,
2466                         array( 'LIMIT' => 20 )
2467                 );
2468
2469                 if ( $res === false ) {
2470                         // This page has no revisions, which is very weird
2471                         return false;
2472                 }
2473
2474                 $hasHistory = ( $res->numRows() > 1 );
2475                 $row = $dbw->fetchObject( $res );
2476
2477                 if ( $row ) { // $row is false if the only contributor is hidden
2478                         $onlyAuthor = $row->rev_user_text;
2479                         // Try to find a second contributor
2480                         foreach ( $res as $row ) {
2481                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2482                                         $onlyAuthor = false;
2483                                         break;
2484                                 }
2485                         }
2486                 } else {
2487                         $onlyAuthor = false;
2488                 }
2489
2490                 // Generate the summary with a '$1' placeholder
2491                 if ( $blank ) {
2492                         // The current revision is blank and the one before is also
2493                         // blank. It's just not our lucky day
2494                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2495                 } else {
2496                         if ( $onlyAuthor ) {
2497                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2498                         } else {
2499                                 $reason = wfMsgForContent( 'excontent', '$1' );
2500                         }
2501                 }
2502
2503                 if ( $reason == '-' ) {
2504                         // Allow these UI messages to be blanked out cleanly
2505                         return '';
2506                 }
2507
2508                 // Replace newlines with spaces to prevent uglyness
2509                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2510                 // Calculate the maximum amount of chars to get
2511                 // Max content length = max comment length - length of the comment (excl. $1)
2512                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2513                 $contents = $wgContLang->truncate( $contents, $maxLength );
2514                 // Remove possible unfinished links
2515                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2516                 // Now replace the '$1' placeholder
2517                 $reason = str_replace( '$1', $contents, $reason );
2518
2519                 return $reason;
2520         }
2521
2522         /**
2523         * Get parser options suitable for rendering the primary article wikitext
2524         * @param User|string $user User object or 'canonical'
2525         * @return ParserOptions
2526         */
2527         public function makeParserOptions( $user ) {
2528                 global $wgContLang;
2529                 if ( $user instanceof User ) { // settings per user (even anons)
2530                         $options = ParserOptions::newFromUser( $user );
2531                 } else { // canonical settings
2532                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
2533                 }
2534                 $options->enableLimitReport(); // show inclusion/loop reports
2535                 $options->setTidy( true ); // fix bad HTML
2536                 return $options;
2537         }
2538
2539         /**
2540          * Update all the appropriate counts in the category table, given that
2541          * we've added the categories $added and deleted the categories $deleted.
2542          *
2543          * @param $added array   The names of categories that were added
2544          * @param $deleted array The names of categories that were deleted
2545          */
2546         public function updateCategoryCounts( $added, $deleted ) {
2547                 $ns = $this->mTitle->getNamespace();
2548                 $dbw = wfGetDB( DB_MASTER );
2549
2550                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2551                 # exist, we might legitimately not create it, but it's simpler to just
2552                 # create it and then give it a negative value, since the value is bogus
2553                 # anyway.
2554                 #
2555                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2556                 $insertCats = array_merge( $added, $deleted );
2557                 if ( !$insertCats ) {
2558                         # Okay, nothing to do
2559                         return;
2560                 }
2561
2562                 $insertRows = array();
2563
2564                 foreach ( $insertCats as $cat ) {
2565                         $insertRows[] = array(
2566                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2567                                 'cat_title' => $cat
2568                         );
2569                 }
2570                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2571
2572                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2573                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2574
2575                 if ( $ns == NS_CATEGORY ) {
2576                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2577                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2578                 } elseif ( $ns == NS_FILE ) {
2579                         $addFields[]    = 'cat_files = cat_files + 1';
2580                         $removeFields[] = 'cat_files = cat_files - 1';
2581                 }
2582
2583                 if ( $added ) {
2584                         $dbw->update(
2585                                 'category',
2586                                 $addFields,
2587                                 array( 'cat_title' => $added ),
2588                                 __METHOD__
2589                         );
2590                 }
2591
2592                 if ( $deleted ) {
2593                         $dbw->update(
2594                                 'category',
2595                                 $removeFields,
2596                                 array( 'cat_title' => $deleted ),
2597                                 __METHOD__
2598                         );
2599                 }
2600         }
2601
2602         /**
2603          * Updates cascading protections
2604          *
2605          * @param $parserOutput ParserOutput object for the current version
2606          */
2607         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2608                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2609                         return;
2610                 }
2611
2612                 // templatelinks table may have become out of sync,
2613                 // especially if using variable-based transclusions.
2614                 // For paranoia, check if things have changed and if
2615                 // so apply updates to the database. This will ensure
2616                 // that cascaded protections apply as soon as the changes
2617                 // are visible.
2618
2619                 # Get templates from templatelinks
2620                 $id = $this->mTitle->getArticleID();
2621
2622                 $tlTemplates = array();
2623
2624                 $dbr = wfGetDB( DB_SLAVE );
2625                 $res = $dbr->select( array( 'templatelinks' ),
2626                         array( 'tl_namespace', 'tl_title' ),
2627                         array( 'tl_from' => $id ),
2628                         __METHOD__
2629                 );
2630
2631                 foreach ( $res as $row ) {
2632                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2633                 }
2634
2635                 # Get templates from parser output.
2636                 $poTemplates = array();
2637                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2638                         foreach ( $templates as $dbk => $id ) {
2639                                 $poTemplates["$ns:$dbk"] = true;
2640                         }
2641                 }
2642
2643                 # Get the diff
2644                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2645
2646                 if ( count( $templates_diff ) > 0 ) {
2647                         # Whee, link updates time.
2648                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2649                         $u->doUpdate();
2650                 }
2651         }
2652
2653         /**
2654          * @deprecated since 1.18
2655          */
2656         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2657                 global $wgUser;
2658                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2659         }
2660
2661         /**
2662          * @deprecated since 1.18
2663          */
2664         public function viewUpdates() {
2665                 global $wgUser;
2666                 return $this->doViewUpdates( $wgUser );
2667         }
2668
2669         /**
2670          * @deprecated since 1.18
2671          */
2672         public function useParserCache( $oldid ) {
2673                 global $wgUser;
2674                 return $this->isParserCacheUsed( $wgUser, $oldid );
2675         }
2676 }