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->getNamespace() == NS_SPECIAL ) {
 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                         && empty( $oldid )
 722                         && $this->mTitle->isWikitextPage();
 723         }
 724
 725         /**
 726          * Perform the actions of a page purging
 727          */
 728         public function doPurge() {
 729                 global $wgUseSquid;
 730
 731                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 732                         return false;
 733                 }
 734
 735                 // Invalidate the cache
 736                 $this->mTitle->invalidateCache();
 737                 $this->clear();
 738
 739                 if ( $wgUseSquid ) {
 740                         // Commit the transaction before the purge is sent
 741                         $dbw = wfGetDB( DB_MASTER );
 742                         $dbw->commit();
 743
 744                         // Send purge
 745                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 746                         $update->doUpdate();
 747                 }
 748
 749                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 750                         if ( $this->getId() == 0 ) {
 751                                 $text = false;
 752                         } else {
 753                                 $text = $this->getRawText();
 754                         }
 755
 756                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 757                 }
 758         }
 759
 760         /**
 761          * Insert a new empty page record for this article.
 762          * This *must* be followed up by creating a revision
 763          * and running $this->updateRevisionOn( ... );
 764          * or else the record will be left in a funky state.
 765          * Best if all done inside a transaction.
 766          *
 767          * @param $dbw DatabaseBase
 768          * @return int The newly created page_id key, or false if the title already existed
 769          */
 770         public function insertOn( $dbw ) {
 771                 wfProfileIn( __METHOD__ );
 772
 773                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 774                 $dbw->insert( 'page', array(
 775                         'page_id'           => $page_id,
 776                         'page_namespace'    => $this->mTitle->getNamespace(),
 777                         'page_title'        => $this->mTitle->getDBkey(),
 778                         'page_counter'      => 0,
 779                         'page_restrictions' => '',
 780                         'page_is_redirect'  => 0, # Will set this shortly...
 781                         'page_is_new'       => 1,
 782                         'page_random'       => wfRandom(),
 783                         'page_touched'      => $dbw->timestamp(),
 784                         'page_latest'       => 0, # Fill this in shortly...
 785                         'page_len'          => 0, # Fill this in shortly...
 786                 ), __METHOD__, 'IGNORE' );
 787
 788                 $affected = $dbw->affectedRows();
 789
 790                 if ( $affected ) {
 791                         $newid = $dbw->insertId();
 792                         $this->mTitle->resetArticleID( $newid );
 793                 }
 794                 wfProfileOut( __METHOD__ );
 795
 796                 return $affected ? $newid : false;
 797         }
 798
 799         /**
 800          * Update the page record to point to a newly saved revision.
 801          *
 802          * @param $dbw DatabaseBase: object
 803          * @param $revision Revision: For ID number, and text used to set
 804          *                  length and redirect status fields
 805          * @param $lastRevision Integer: if given, will not overwrite the page field
 806          *                      when different from the currently set value.
 807          *                      Giving 0 indicates the new page flag should be set
 808          *                      on.
 809          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 810          *                           removing rows in redirect table.
 811          * @return bool true on success, false on failure
 812          * @private
 813          */
 814         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 815                 wfProfileIn( __METHOD__ );
 816
 817                 $text = $revision->getText();
 818                 $rt = Title::newFromRedirectRecurse( $text );
 819
 820                 $conditions = array( 'page_id' => $this->getId() );
 821
 822                 if ( !is_null( $lastRevision ) ) {
 823                         # An extra check against threads stepping on each other
 824                         $conditions['page_latest'] = $lastRevision;
 825                 }
 826
 827                 $now = wfTimestampNow();
 828                 $dbw->update( 'page',
 829                         array( /* SET */
 830                                 'page_latest'      => $revision->getId(),
 831                                 'page_touched'     => $dbw->timestamp( $now ),
 832                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 833                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 834                                 'page_len'         => strlen( $text ),
 835                         ),
 836                         $conditions,
 837                         __METHOD__ );
 838
 839                 $result = $dbw->affectedRows() != 0;
 840                 if ( $result ) {
 841                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 842                         $this->setCachedLastEditTime( $now );
 843                 }
 844
 845                 wfProfileOut( __METHOD__ );
 846                 return $result;
 847         }
 848
 849         /**
 850          * Get the cached timestamp for the last time the page changed.
 851          * This is only used to help handle slave lag by comparing to page_touched.
 852          * @return string MW timestamp
 853          */
 854         protected function getCachedLastEditTime() {
 855                 global $wgMemc;
 856                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 857                 return $wgMemc->get( $key );
 858         }
 859
 860         /**
 861          * Set the cached timestamp for the last time the page changed.
 862          * This is only used to help handle slave lag by comparing to page_touched.
 863          * @param $timestamp string
 864          * @return void
 865          */
 866         public function setCachedLastEditTime( $timestamp ) {
 867                 global $wgMemc;
 868                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 869                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 870         }
 871
 872         /**
 873          * Add row to the redirect table if this is a redirect, remove otherwise.
 874          *
 875          * @param $dbw DatabaseBase
 876          * @param $redirectTitle Title object pointing to the redirect target,
 877          *                       or NULL if this is not a redirect
 878          * @param $lastRevIsRedirect If given, will optimize adding and
 879          *                           removing rows in redirect table.
 880          * @return bool true on success, false on failure
 881          * @private
 882          */
 883         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 884                 // Always update redirects (target link might have changed)
 885                 // Update/Insert if we don't know if the last revision was a redirect or not
 886                 // Delete if changing from redirect to non-redirect
 887                 $isRedirect = !is_null( $redirectTitle );
 888
 889                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 890                         return true;
 891                 }
 892
 893                 wfProfileIn( __METHOD__ );
 894                 if ( $isRedirect ) {
 895                         $this->insertRedirectEntry( $redirectTitle );
 896                 } else {
 897                         // This is not a redirect, remove row from redirect table
 898                         $where = array( 'rd_from' => $this->getId() );
 899                         $dbw->delete( 'redirect', $where, __METHOD__ );
 900                 }
 901
 902                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 903                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 904                 }
 905                 wfProfileOut( __METHOD__ );
 906
 907                 return ( $dbw->affectedRows() != 0 );
 908         }
 909
 910         /**
 911          * If the given revision is newer than the currently set page_latest,
 912          * update the page record. Otherwise, do nothing.
 913          *
 914          * @param $dbw Database object
 915          * @param $revision Revision object
 916          * @return mixed
 917          */
 918         public function updateIfNewerOn( $dbw, $revision ) {
 919                 wfProfileIn( __METHOD__ );
 920
 921                 $row = $dbw->selectRow(
 922                         array( 'revision', 'page' ),
 923                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 924                         array(
 925                                 'page_id' => $this->getId(),
 926                                 'page_latest=rev_id' ),
 927                         __METHOD__ );
 928
 929                 if ( $row ) {
 930                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 931                                 wfProfileOut( __METHOD__ );
 932                                 return false;
 933                         }
 934                         $prev = $row->rev_id;
 935                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 936                 } else {
 937                         # No or missing previous revision; mark the page as new
 938                         $prev = 0;
 939                         $lastRevIsRedirect = null;
 940                 }
 941
 942                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 943
 944                 wfProfileOut( __METHOD__ );
 945                 return $ret;
 946         }
 947
 948         /**
 949          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 950          * @param $text String: new text of the section
 951          * @param $summary String: new section's subject, only if $section is 'new'
 952          * @param $edittime String: revision timestamp or null to use the current revision
 953          * @return string Complete article text, or null if error
 954          */
 955         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 956                 wfProfileIn( __METHOD__ );
 957
 958                 if ( strval( $section ) == '' ) {
 959                         // Whole-page edit; let the whole text through
 960                 } else {
 961                         if ( is_null( $edittime ) ) {
 962                                 $rev = Revision::newFromTitle( $this->mTitle );
 963                         } else {
 964                                 $dbw = wfGetDB( DB_MASTER );
 965                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 966                         }
 967
 968                         if ( !$rev ) {
 969                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 970                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 971                                 wfProfileOut( __METHOD__ );
 972                                 return null;
 973                         }
 974
 975                         $oldtext = $rev->getText();
 976
 977                         if ( $section == 'new' ) {
 978                                 # Inserting a new section
 979                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 980                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
 981                                         $text = strlen( trim( $oldtext ) ) > 0
 982                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 983                                                 : "{$subject}{$text}";
 984                                 }
 985                         } else {
 986                                 # Replacing an existing section; roll out the big guns
 987                                 global $wgParser;
 988
 989                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 990                         }
 991                 }
 992
 993                 wfProfileOut( __METHOD__ );
 994                 return $text;
 995         }
 996
 997         /**
 998          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 999          * @param $flags Int
1000          * @return Int updated $flags
1001          */
1002         function checkFlags( $flags ) {
1003                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1004                         if ( $this->mTitle->getArticleID() ) {
1005                                 $flags |= EDIT_UPDATE;
1006                         } else {
1007                                 $flags |= EDIT_NEW;
1008                         }
1009                 }
1010
1011                 return $flags;
1012         }
1013
1014         /**
1015          * Change an existing article or create a new article. Updates RC and all necessary caches,
1016          * optionally via the deferred update array.
1017          *
1018          * @param $text String: new text
1019          * @param $summary String: edit summary
1020          * @param $flags Integer bitfield:
1021          *      EDIT_NEW
1022          *          Article is known or assumed to be non-existent, create a new one
1023          *      EDIT_UPDATE
1024          *          Article is known or assumed to be pre-existing, update it
1025          *      EDIT_MINOR
1026          *          Mark this edit minor, if the user is allowed to do so
1027          *      EDIT_SUPPRESS_RC
1028          *          Do not log the change in recentchanges
1029          *      EDIT_FORCE_BOT
1030          *          Mark the edit a "bot" edit regardless of user rights
1031          *      EDIT_DEFER_UPDATES
1032          *          Defer some of the updates until the end of index.php
1033          *      EDIT_AUTOSUMMARY
1034          *          Fill in blank summaries with generated text where possible
1035          *
1036          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1037          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1038          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1039          * edit-already-exists error will be returned. These two conditions are also possible with
1040          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1041          *
1042          * @param $baseRevId the revision ID this edit was based off, if any
1043          * @param $user User the user doing the edit
1044          *
1045          * @return Status object. Possible errors:
1046          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1047          *     edit-gone-missing:       In update mode, but the article didn't exist
1048          *     edit-conflict:           In update mode, the article changed unexpectedly
1049          *     edit-no-change:          Warning that the text was the same as before
1050          *     edit-already-exists:     In creation mode, but the article already exists
1051          *
1052          *  Extensions may define additional errors.
1053          *
1054          *  $return->value will contain an associative array with members as follows:
1055          *     new:                     Boolean indicating if the function attempted to create a new article
1056          *     revision:                The revision object for the inserted revision, or null
1057          *
1058          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1059          */
1060         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1061                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1062
1063                 # Low-level sanity check
1064                 if ( $this->mTitle->getText() === '' ) {
1065                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1066                 }
1067
1068                 wfProfileIn( __METHOD__ );
1069
1070                 $user = is_null( $user ) ? $wgUser : $user;
1071                 $status = Status::newGood( array() );
1072
1073                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1074                 $this->loadPageData( 'fromdbmaster' );
1075
1076                 $flags = $this->checkFlags( $flags );
1077
1078                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1079                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1080                 {
1081                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1082
1083                         if ( $status->isOK() ) {
1084                                 $status->fatal( 'edit-hook-aborted' );
1085                         }
1086
1087                         wfProfileOut( __METHOD__ );
1088                         return $status;
1089                 }
1090
1091                 # Silently ignore EDIT_MINOR if not allowed
1092                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1093                 $bot = $flags & EDIT_FORCE_BOT;
1094
1095                 $oldtext = $this->getRawText(); // current revision
1096                 $oldsize = strlen( $oldtext );
1097                 $oldcountable = $this->isCountable();
1098
1099                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1100                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1101                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1102                 }
1103
1104                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1105                 $text = $editInfo->pst;
1106                 $newsize = strlen( $text );
1107
1108                 $dbw = wfGetDB( DB_MASTER );
1109                 $now = wfTimestampNow();
1110                 $this->mTimestamp = $now;
1111
1112                 if ( $flags & EDIT_UPDATE ) {
1113                         # Update article, but only if changed.
1114                         $status->value['new'] = false;
1115
1116                         # Make sure the revision is either completely inserted or not inserted at all
1117                         if ( !$wgDBtransactions ) {
1118                                 $userAbort = ignore_user_abort( true );
1119                         }
1120
1121                         $revision = new Revision( array(
1122                                 'page'       => $this->getId(),
1123                                 'comment'    => $summary,
1124                                 'minor_edit' => $isminor,
1125                                 'text'       => $text,
1126                                 'parent_id'  => $this->mLatest,
1127                                 'user'       => $user->getId(),
1128                                 'user_text'  => $user->getName(),
1129                                 'timestamp'  => $now
1130                         ) );
1131
1132                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1133
1134                         if ( $changed ) {
1135                                 if ( !$this->mLatest ) {
1136                                         # Article gone missing
1137                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1138                                         $status->fatal( 'edit-gone-missing' );
1139
1140                                         wfProfileOut( __METHOD__ );
1141                                         return $status;
1142                                 }
1143
1144                                 $dbw->begin();
1145                                 $revisionId = $revision->insertOn( $dbw );
1146
1147                                 # Update page
1148                                 #
1149                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1150                                 # during the course of this function. This makes sure that EditPage can detect
1151                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1152                                 # before this function is called. A previous function used a separate query, this
1153                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1154                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1155
1156                                 if ( !$ok ) {
1157                                         /* Belated edit conflict! Run away!! */
1158                                         $status->fatal( 'edit-conflict' );
1159
1160                                         # Delete the invalid revision if the DB is not transactional
1161                                         if ( !$wgDBtransactions ) {
1162                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1163                                         }
1164
1165                                         $revisionId = 0;
1166                                         $dbw->rollback();
1167                                 } else {
1168                                         global $wgUseRCPatrol;
1169                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1170                                         # Update recentchanges
1171                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1172                                                 # Mark as patrolled if the user can do so
1173                                                 $patrolled = $wgUseRCPatrol && !count(
1174                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1175                                                 # Add RC row to the DB
1176                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1177                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1178                                                         $revisionId, $patrolled
1179                                                 );
1180
1181                                                 # Log auto-patrolled edits
1182                                                 if ( $patrolled ) {
1183                                                         PatrolLog::record( $rc, true );
1184                                                 }
1185                                         }
1186                                         $user->incEditCount();
1187                                         $dbw->commit();
1188                                 }
1189                         }
1190
1191                         if ( !$wgDBtransactions ) {
1192                                 ignore_user_abort( $userAbort );
1193                         }
1194
1195                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1196                         if ( !$status->isOK() ) {
1197                                 wfProfileOut( __METHOD__ );
1198                                 return $status;
1199                         }
1200
1201                         # Update links tables, site stats, etc.
1202                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1203                                 'oldcountable' => $oldcountable ) );
1204
1205                         if ( !$changed ) {
1206                                 $status->warning( 'edit-no-change' );
1207                                 $revision = null;
1208                                 // Keep the same revision ID, but do some updates on it
1209                                 $revisionId = $this->getLatest();
1210                                 // Update page_touched, this is usually implicit in the page update
1211                                 // Other cache updates are done in onArticleEdit()
1212                                 $this->mTitle->invalidateCache();
1213                         }
1214                 } else {
1215                         # Create new article
1216                         $status->value['new'] = true;
1217
1218                         $dbw->begin();
1219
1220                         # Add the page record; stake our claim on this title!
1221                         # This will return false if the article already exists
1222                         $newid = $this->insertOn( $dbw );
1223
1224                         if ( $newid === false ) {
1225                                 $dbw->rollback();
1226                                 $status->fatal( 'edit-already-exists' );
1227
1228                                 wfProfileOut( __METHOD__ );
1229                                 return $status;
1230                         }
1231
1232                         # Save the revision text...
1233                         $revision = new Revision( array(
1234                                 'page'       => $newid,
1235                                 'comment'    => $summary,
1236                                 'minor_edit' => $isminor,
1237                                 'text'       => $text,
1238                                 'user'       => $user->getId(),
1239                                 'user_text'  => $user->getName(),
1240                                 'timestamp'  => $now
1241                         ) );
1242                         $revisionId = $revision->insertOn( $dbw );
1243
1244                         $this->mTitle->resetArticleID( $newid );
1245                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1246                         # @todo FIXME?
1247                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1248
1249                         # Update the page record with revision data
1250                         $this->updateRevisionOn( $dbw, $revision, 0 );
1251
1252                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1253
1254                         # Update recentchanges
1255                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1256                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1257
1258                                 # Mark as patrolled if the user can do so
1259                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1260                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1261                                 # Add RC row to the DB
1262                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1263                                         '', strlen( $text ), $revisionId, $patrolled );
1264
1265                                 # Log auto-patrolled edits
1266                                 if ( $patrolled ) {
1267                                         PatrolLog::record( $rc, true );
1268                                 }
1269                         }
1270                         $user->incEditCount();
1271                         $dbw->commit();
1272
1273                         # Update links, etc.
1274                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1275
1276                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1277                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1278                 }
1279
1280                 # Do updates right now unless deferral was requested
1281                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1282                         DeferredUpdates::doUpdates();
1283                 }
1284
1285                 // Return the new revision (or null) to the caller
1286                 $status->value['revision'] = $revision;
1287
1288                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1289                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1290
1291                 # Promote user to any groups they meet the criteria for
1292                 $user->addAutopromoteOnceGroups( 'onEdit' );
1293
1294                 wfProfileOut( __METHOD__ );
1295                 return $status;
1296         }
1297
1298         /**
1299          * Update the article's restriction field, and leave a log entry.
1300          *
1301          * @todo: seperate the business/permission stuff out from backend code
1302          *
1303          * @param $limit Array: set of restriction keys
1304          * @param $reason String
1305          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1306          * @param $expiry Array: per restriction type expiration
1307          * @param $user User The user updating the restrictions
1308          * @return bool true on success
1309          */
1310         public function updateRestrictions(
1311                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1312         ) {
1313                 global $wgUser, $wgContLang;
1314                 $user = is_null( $user ) ? $wgUser : $user;
1315
1316                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1317
1318                 $id = $this->mTitle->getArticleID();
1319
1320                 if ( $id <= 0 ) {
1321                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1322                         return false;
1323                 }
1324
1325                 if ( wfReadOnly() ) {
1326                         wfDebug( "updateRestrictions failed: read-only\n" );
1327                         return false;
1328                 }
1329
1330                 if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
1331                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1332                         return false;
1333                 }
1334
1335                 if ( !$cascade ) {
1336                         $cascade = false;
1337                 }
1338
1339                 // Take this opportunity to purge out expired restrictions
1340                 Title::purgeExpiredRestrictions();
1341
1342                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1343                 # we expect a single selection, but the schema allows otherwise.
1344                 $current = array();
1345                 $updated = self::flattenRestrictions( $limit );
1346                 $changed = false;
1347
1348                 foreach ( $restrictionTypes as $action ) {
1349                         if ( isset( $expiry[$action] ) ) {
1350                                 # Get current restrictions on $action
1351                                 $aLimits = $this->mTitle->getRestrictions( $action );
1352                                 $current[$action] = implode( '', $aLimits );
1353                                 # Are any actual restrictions being dealt with here?
1354                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1355
1356                                 # If something changed, we need to log it. Checking $aRChanged
1357                                 # assures that "unprotecting" a page that is not protected does
1358                                 # not log just because the expiry was "changed".
1359                                 if ( $aRChanged &&
1360                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1361                                 {
1362                                         $changed = true;
1363                                 }
1364                         }
1365                 }
1366
1367                 $current = self::flattenRestrictions( $current );
1368
1369                 $changed = ( $changed || $current != $updated );
1370                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1371                 $protect = ( $updated != '' );
1372
1373                 # If nothing's changed, do nothing
1374                 if ( $changed ) {
1375                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1376                                 $dbw = wfGetDB( DB_MASTER );
1377
1378                                 # Prepare a null revision to be added to the history
1379                                 $modified = $current != '' && $protect;
1380
1381                                 if ( $protect ) {
1382                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1383                                 } else {
1384                                         $comment_type = 'unprotectedarticle';
1385                                 }
1386
1387                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1388
1389                                 # Only restrictions with the 'protect' right can cascade...
1390                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1391                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1392
1393                                 # The schema allows multiple restrictions
1394                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1395                                         $cascade = false;
1396                                 }
1397
1398                                 $cascade_description = '';
1399
1400                                 if ( $cascade ) {
1401                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1402                                 }
1403
1404                                 if ( $reason ) {
1405                                         $comment .= ": $reason";
1406                                 }
1407
1408                                 $editComment = $comment;
1409                                 $encodedExpiry = array();
1410                                 $protect_description = '';
1411                                 foreach ( $limit as $action => $restrictions ) {
1412                                         if ( !isset( $expiry[$action] ) )
1413                                                 $expiry[$action] = $dbw->getInfinity();
1414
1415                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1416                                         if ( $restrictions != '' ) {
1417                                                 $protect_description .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1418                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1419                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1420                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1421                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1422                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1423                                                 } else {
1424                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1425                                                 }
1426
1427                                                 $protect_description .= ') ';
1428                                         }
1429                                 }
1430                                 $protect_description = trim( $protect_description );
1431
1432                                 if ( $protect_description && $protect ) {
1433                                         $editComment .= " ($protect_description)";
1434                                 }
1435
1436                                 if ( $cascade ) {
1437                                         $editComment .= "$cascade_description";
1438                                 }
1439
1440                                 # Update restrictions table
1441                                 foreach ( $limit as $action => $restrictions ) {
1442                                         if ( $restrictions != '' ) {
1443                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1444                                                         array( 'pr_page' => $id,
1445                                                                 'pr_type' => $action,
1446                                                                 'pr_level' => $restrictions,
1447                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1448                                                                 'pr_expiry' => $encodedExpiry[$action]
1449                                                         ),
1450                                                         __METHOD__
1451                                                 );
1452                                         } else {
1453                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1454                                                         'pr_type' => $action ), __METHOD__ );
1455                                         }
1456                                 }
1457
1458                                 # Insert a null revision
1459                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1460                                 $nullRevId = $nullRevision->insertOn( $dbw );
1461
1462                                 $latest = $this->getLatest();
1463                                 # Update page record
1464                                 $dbw->update( 'page',
1465                                         array( /* SET */
1466                                                 'page_touched' => $dbw->timestamp(),
1467                                                 'page_restrictions' => '',
1468                                                 'page_latest' => $nullRevId
1469                                         ), array( /* WHERE */
1470                                                 'page_id' => $id
1471                                         ), __METHOD__
1472                                 );
1473
1474                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1475                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1476
1477                                 # Update the protection log
1478                                 $log = new LogPage( 'protect' );
1479                                 if ( $protect ) {
1480                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1481                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1482                                 } else {
1483                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1484                                 }
1485                         } # End hook
1486                 } # End "changed" check
1487
1488                 return true;
1489         }
1490
1491         /**
1492          * Take an array of page restrictions and flatten it to a string
1493          * suitable for insertion into the page_restrictions field.
1494          * @param $limit Array
1495          * @return String
1496          */
1497         protected static function flattenRestrictions( $limit ) {
1498                 if ( !is_array( $limit ) ) {
1499                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1500                 }
1501
1502                 $bits = array();
1503                 ksort( $limit );
1504
1505                 foreach ( $limit as $action => $restrictions ) {
1506                         if ( $restrictions != '' ) {
1507                                 $bits[] = "$action=$restrictions";
1508                         }
1509                 }
1510
1511                 return implode( ':', $bits );
1512         }
1513
1514         /**
1515          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1516          */
1517         public function isBigDeletion() {
1518                 global $wgDeleteRevisionsLimit;
1519
1520                 if ( $wgDeleteRevisionsLimit ) {
1521                         $revCount = $this->estimateRevisionCount();
1522
1523                         return $revCount > $wgDeleteRevisionsLimit;
1524                 }
1525
1526                 return false;
1527         }
1528
1529         /**
1530          * @return int approximate revision count
1531          */
1532         public function estimateRevisionCount() {
1533                 $dbr = wfGetDB( DB_SLAVE );
1534                 return $dbr->estimateRowCount( 'revision', '*',
1535                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1536         }
1537
1538         /**
1539          * Get the last N authors
1540          * @param $num Integer: number of revisions to get
1541          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1542          * @return array Array of authors, duplicates not removed
1543          */
1544         public function getLastNAuthors( $num, $revLatest = 0 ) {
1545                 wfProfileIn( __METHOD__ );
1546                 // First try the slave
1547                 // If that doesn't have the latest revision, try the master
1548                 $continue = 2;
1549                 $db = wfGetDB( DB_SLAVE );
1550
1551                 do {
1552                         $res = $db->select( array( 'page', 'revision' ),
1553                                 array( 'rev_id', 'rev_user_text' ),
1554                                 array(
1555                                         'page_namespace' => $this->mTitle->getNamespace(),
1556                                         'page_title' => $this->mTitle->getDBkey(),
1557                                         'rev_page = page_id'
1558                                 ), __METHOD__,
1559                                 array(
1560                                         'ORDER BY' => 'rev_timestamp DESC',
1561                                         'LIMIT' => $num
1562                                 )
1563                         );
1564
1565                         if ( !$res ) {
1566                                 wfProfileOut( __METHOD__ );
1567                                 return array();
1568                         }
1569
1570                         $row = $db->fetchObject( $res );
1571
1572                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1573                                 $db = wfGetDB( DB_MASTER );
1574                                 $continue--;
1575                         } else {
1576                                 $continue = 0;
1577                         }
1578                 } while ( $continue );
1579
1580                 $authors = array( $row->rev_user_text );
1581
1582                 foreach ( $res as $row ) {
1583                         $authors[] = $row->rev_user_text;
1584                 }
1585
1586                 wfProfileOut( __METHOD__ );
1587                 return $authors;
1588         }
1589
1590         /**
1591          * Back-end article deletion
1592          * Deletes the article with database consistency, writes logs, purges caches
1593          *
1594          * @param $reason string delete reason for deletion log
1595          * @param $suppress bitfield
1596          *      Revision::DELETED_TEXT
1597          *      Revision::DELETED_COMMENT
1598          *      Revision::DELETED_USER
1599          *      Revision::DELETED_RESTRICTED
1600          * @param $id int article ID
1601          * @param $commit boolean defaults to true, triggers transaction end
1602          * @param &$errors Array of errors to append to
1603          * @param $user User The relevant user
1604          * @return boolean true if successful
1605          */
1606         public function doDeleteArticle(
1607                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1608         ) {
1609                 global $wgUseTrackbacks, $wgUser;
1610                 $user = is_null( $user ) ? $wgUser : $user;
1611
1612                 wfDebug( __METHOD__ . "\n" );
1613
1614                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1615                         return false;
1616                 }
1617                 $dbw = wfGetDB( DB_MASTER );
1618                 $t = $this->mTitle->getDBkey();
1619                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1620
1621                 if ( $t === '' || $id == 0 ) {
1622                         return false;
1623                 }
1624
1625                 DeferredUpdates::addUpdate(
1626                         new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 )
1627                 );
1628
1629                 // Bitfields to further suppress the content
1630                 if ( $suppress ) {
1631                         $bitfield = 0;
1632                         // This should be 15...
1633                         $bitfield |= Revision::DELETED_TEXT;
1634                         $bitfield |= Revision::DELETED_COMMENT;
1635                         $bitfield |= Revision::DELETED_USER;
1636                         $bitfield |= Revision::DELETED_RESTRICTED;
1637                 } else {
1638                         $bitfield = 'rev_deleted';
1639                 }
1640
1641                 $dbw->begin();
1642                 // For now, shunt the revision data into the archive table.
1643                 // Text is *not* removed from the text table; bulk storage
1644                 // is left intact to avoid breaking block-compression or
1645                 // immutable storage schemes.
1646                 //
1647                 // For backwards compatibility, note that some older archive
1648                 // table entries will have ar_text and ar_flags fields still.
1649                 //
1650                 // In the future, we may keep revisions and mark them with
1651                 // the rev_deleted field, which is reserved for this purpose.
1652                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1653                         array(
1654                                 'ar_namespace'  => 'page_namespace',
1655                                 'ar_title'      => 'page_title',
1656                                 'ar_comment'    => 'rev_comment',
1657                                 'ar_user'       => 'rev_user',
1658                                 'ar_user_text'  => 'rev_user_text',
1659                                 'ar_timestamp'  => 'rev_timestamp',
1660                                 'ar_minor_edit' => 'rev_minor_edit',
1661                                 'ar_rev_id'     => 'rev_id',
1662                                 'ar_parent_id'  => 'rev_parent_id',
1663                                 'ar_text_id'    => 'rev_text_id',
1664                                 'ar_text'       => '\'\'', // Be explicit to appease
1665                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1666                                 'ar_len'        => 'rev_len',
1667                                 'ar_page_id'    => 'page_id',
1668                                 'ar_deleted'    => $bitfield,
1669                                 'ar_sha1'       => 'rev_sha1'
1670                         ), array(
1671                                 'page_id' => $id,
1672                                 'page_id = rev_page'
1673                         ), __METHOD__
1674                 );
1675
1676                 # Delete restrictions for it
1677                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1678
1679                 # Now that it's safely backed up, delete it
1680                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1681                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1682
1683                 if ( !$ok ) {
1684                         $dbw->rollback();
1685                         return false;
1686                 }
1687
1688                 # Fix category table counts
1689                 $cats = array();
1690                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1691
1692                 foreach ( $res as $row ) {
1693                         $cats [] = $row->cl_to;
1694                 }
1695
1696                 $this->updateCategoryCounts( array(), $cats );
1697
1698                 # If using cascading deletes, we can skip some explicit deletes
1699                 if ( !$dbw->cascadingDeletes() ) {
1700                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1701
1702                         if ( $wgUseTrackbacks ) {
1703                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1704                         }
1705
1706                         # Delete outgoing links
1707                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
1708                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
1709                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
1710                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
1711                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
1712                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
1713                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
1714                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
1715                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
1716                 }
1717
1718                 # If using cleanup triggers, we can skip some manual deletes
1719                 if ( !$dbw->cleanupTriggers() ) {
1720                         # Clean up recentchanges entries...
1721                         $dbw->delete( 'recentchanges',
1722                                 array( 'rc_type != ' . RC_LOG,
1723                                         'rc_namespace' => $this->mTitle->getNamespace(),
1724                                         'rc_title' => $this->mTitle->getDBkey() ),
1725                                 __METHOD__ );
1726                         $dbw->delete( 'recentchanges',
1727                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1728                                 __METHOD__ );
1729                 }
1730
1731                 # Clear caches
1732                 self::onArticleDelete( $this->mTitle );
1733
1734                 # Clear the cached article id so the interface doesn't act like we exist
1735                 $this->mTitle->resetArticleID( 0 );
1736
1737                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1738                 $logtype = $suppress ? 'suppress' : 'delete';
1739
1740                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
1741                 $logEntry->setPerformer( $user );
1742                 $logEntry->setTarget( $this->mTitle );
1743                 $logEntry->setComment( $reason );
1744                 $logid = $logEntry->insert();
1745                 $logEntry->publish( $logid );
1746
1747                 if ( $commit ) {
1748                         $dbw->commit();
1749                 }
1750
1751                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1752                 return true;
1753         }
1754
1755         /**
1756          * Roll back the most recent consecutive set of edits to a page
1757          * from the same user; fails if there are no eligible edits to
1758          * roll back to, e.g. user is the sole contributor. This function
1759          * performs permissions checks on $user, then calls commitRollback()
1760          * to do the dirty work
1761          *
1762          * @todo: seperate the business/permission stuff out from backend code
1763          *
1764          * @param $fromP String: Name of the user whose edits to rollback.
1765          * @param $summary String: Custom summary. Set to default summary if empty.
1766          * @param $token String: Rollback token.
1767          * @param $bot Boolean: If true, mark all reverted edits as bot.
1768          *
1769          * @param $resultDetails Array: contains result-specific array of additional values
1770          *    'alreadyrolled' : 'current' (rev)
1771          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1772          *
1773          * @param $user User The user performing the rollback
1774          * @return array of errors, each error formatted as
1775          *   array(messagekey, param1, param2, ...).
1776          * On success, the array is empty.  This array can also be passed to
1777          * OutputPage::showPermissionsErrorPage().
1778          */
1779         public function doRollback(
1780                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1781         ) {
1782                 $resultDetails = null;
1783
1784                 # Check permissions
1785                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1786                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1787                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1788
1789                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1790                         $errors[] = array( 'sessionfailure' );
1791                 }
1792
1793                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1794                         $errors[] = array( 'actionthrottledtext' );
1795                 }
1796
1797                 # If there were errors, bail out now
1798                 if ( !empty( $errors ) ) {
1799                         return $errors;
1800                 }
1801
1802                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1803         }
1804
1805         /**
1806          * Backend implementation of doRollback(), please refer there for parameter
1807          * and return value documentation
1808          *
1809          * NOTE: This function does NOT check ANY permissions, it just commits the
1810          * rollback to the DB. Therefore, you should only call this function direct-
1811          * ly if you want to use custom permissions checks. If you don't, use
1812          * doRollback() instead.
1813          * @param $fromP String: Name of the user whose edits to rollback.
1814          * @param $summary String: Custom summary. Set to default summary if empty.
1815          * @param $bot Boolean: If true, mark all reverted edits as bot.
1816          *
1817          * @param $resultDetails Array: contains result-specific array of additional values
1818          * @param $guser User The user performing the rollback
1819          */
1820         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1821                 global $wgUseRCPatrol, $wgContLang;
1822
1823                 $dbw = wfGetDB( DB_MASTER );
1824
1825                 if ( wfReadOnly() ) {
1826                         return array( array( 'readonlytext' ) );
1827                 }
1828
1829                 # Get the last editor
1830                 $current = Revision::newFromTitle( $this->mTitle );
1831                 if ( is_null( $current ) ) {
1832                         # Something wrong... no page?
1833                         return array( array( 'notanarticle' ) );
1834                 }
1835
1836                 $from = str_replace( '_', ' ', $fromP );
1837                 # User name given should match up with the top revision.
1838                 # If the user was deleted then $from should be empty.
1839                 if ( $from != $current->getUserText() ) {
1840                         $resultDetails = array( 'current' => $current );
1841                         return array( array( 'alreadyrolled',
1842                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1843                                 htmlspecialchars( $fromP ),
1844                                 htmlspecialchars( $current->getUserText() )
1845                         ) );
1846                 }
1847
1848                 # Get the last edit not by this guy...
1849                 # Note: these may not be public values
1850                 $user = intval( $current->getRawUser() );
1851                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1852                 $s = $dbw->selectRow( 'revision',
1853                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1854                         array( 'rev_page' => $current->getPage(),
1855                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1856                         ), __METHOD__,
1857                         array( 'USE INDEX' => 'page_timestamp',
1858                                 'ORDER BY' => 'rev_timestamp DESC' )
1859                         );
1860                 if ( $s === false ) {
1861                         # No one else ever edited this page
1862                         return array( array( 'cantrollback' ) );
1863                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1864                         # Only admins can see this text
1865                         return array( array( 'notvisiblerev' ) );
1866                 }
1867
1868                 $set = array();
1869                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1870                         # Mark all reverted edits as bot
1871                         $set['rc_bot'] = 1;
1872                 }
1873
1874                 if ( $wgUseRCPatrol ) {
1875                         # Mark all reverted edits as patrolled
1876                         $set['rc_patrolled'] = 1;
1877                 }
1878
1879                 if ( count( $set ) ) {
1880                         $dbw->update( 'recentchanges', $set,
1881                                 array( /* WHERE */
1882                                         'rc_cur_id' => $current->getPage(),
1883                                         'rc_user_text' => $current->getUserText(),
1884                                         "rc_timestamp > '{$s->rev_timestamp}'",
1885                                 ), __METHOD__
1886                         );
1887                 }
1888
1889                 # Generate the edit summary if necessary
1890                 $target = Revision::newFromId( $s->rev_id );
1891                 if ( empty( $summary ) ) {
1892                         if ( $from == '' ) { // no public user name
1893                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1894                         } else {
1895                                 $summary = wfMsgForContent( 'revertpage' );
1896                         }
1897                 }
1898
1899                 # Allow the custom summary to use the same args as the default message
1900                 $args = array(
1901                         $target->getUserText(), $from, $s->rev_id,
1902                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1903                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1904                 );
1905                 $summary = wfMsgReplaceArgs( $summary, $args );
1906
1907                 # Save
1908                 $flags = EDIT_UPDATE;
1909
1910                 if ( $guser->isAllowed( 'minoredit' ) ) {
1911                         $flags |= EDIT_MINOR;
1912                 }
1913
1914                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1915                         $flags |= EDIT_FORCE_BOT;
1916                 }
1917
1918                 # Actually store the edit
1919                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1920                 if ( !empty( $status->value['revision'] ) ) {
1921                         $revId = $status->value['revision']->getId();
1922                 } else {
1923                         $revId = false;
1924                 }
1925
1926                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1927
1928                 $resultDetails = array(
1929                         'summary' => $summary,
1930                         'current' => $current,
1931                         'target'  => $target,
1932                         'newid'   => $revId
1933                 );
1934
1935                 return array();
1936         }
1937
1938         /**
1939          * Do standard deferred updates after page view
1940          * @param $user User The relevant user
1941          */
1942         public function doViewUpdates( User $user ) {
1943                 global $wgDisableCounters;
1944                 if ( wfReadOnly() ) {
1945                         return;
1946                 }
1947
1948                 # Don't update page view counters on views from bot users (bug 14044)
1949                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1950                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1951                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1952                 }
1953
1954                 # Update newtalk / watchlist notification status
1955                 $user->clearNotification( $this->mTitle );
1956         }
1957
1958         /**
1959          * Prepare text which is about to be saved.
1960          * Returns a stdclass with source, pst and output members
1961          */
1962         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1963                 global $wgParser, $wgContLang, $wgUser;
1964                 $user = is_null( $user ) ? $wgUser : $user;
1965                 // @TODO fixme: check $user->getId() here???
1966                 if ( $this->mPreparedEdit
1967                         && $this->mPreparedEdit->newText == $text
1968                         && $this->mPreparedEdit->revid == $revid
1969                 ) {
1970                         // Already prepared
1971                         return $this->mPreparedEdit;
1972                 }
1973
1974                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1975                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1976
1977                 $edit = (object)array();
1978                 $edit->revid = $revid;
1979                 $edit->newText = $text;
1980                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1981                 $edit->popts = $this->makeParserOptions( 'canonical' );
1982                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1983                 $edit->oldText = $this->getRawText();
1984
1985                 $this->mPreparedEdit = $edit;
1986
1987                 return $edit;
1988         }
1989
1990         /**
1991          * Do standard deferred updates after page edit.
1992          * Update links tables, site stats, search index and message cache.
1993          * Purges pages that include this page if the text was changed here.
1994          * Every 100th edit, prune the recent changes table.
1995          *
1996          * @private
1997          * @param $revision Revision object
1998          * @param $user User object that did the revision
1999          * @param $options Array of options, following indexes are used:
2000          * - changed: boolean, whether the revision changed the content (default true)
2001          * - created: boolean, whether the revision created the page (default false)
2002          * - oldcountable: boolean or null (default null):
2003          *   - boolean: whether the page was counted as an article before that
2004          *     revision, only used in changed is true and created is false
2005          *   - null: don't change the article count
2006          */
2007         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2008                 global $wgEnableParserCache;
2009
2010                 wfProfileIn( __METHOD__ );
2011
2012                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2013                 $text = $revision->getText();
2014
2015                 # Parse the text
2016                 # Be careful not to double-PST: $text is usually already PST-ed once
2017                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2018                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2019                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
2020                 } else {
2021                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2022                         $editInfo = $this->mPreparedEdit;
2023                 }
2024
2025                 # Save it to the parser cache
2026                 if ( $wgEnableParserCache ) {
2027                         $parserCache = ParserCache::singleton();
2028                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2029                 }
2030
2031                 # Update the links tables
2032                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2033                 $u->doUpdate();
2034
2035                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2036
2037                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2038                         if ( 0 == mt_rand( 0, 99 ) ) {
2039                                 // Flush old entries from the `recentchanges` table; we do this on
2040                                 // random requests so as to avoid an increase in writes for no good reason
2041                                 global $wgRCMaxAge;
2042
2043                                 $dbw = wfGetDB( DB_MASTER );
2044                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2045                                 $dbw->delete(
2046                                         'recentchanges',
2047                                         array( "rc_timestamp < '$cutoff'" ),
2048                                         __METHOD__
2049                                 );
2050                         }
2051                 }
2052
2053                 $id = $this->getId();
2054                 $title = $this->mTitle->getPrefixedDBkey();
2055                 $shortTitle = $this->mTitle->getDBkey();
2056
2057                 if ( 0 == $id ) {
2058                         wfProfileOut( __METHOD__ );
2059                         return;
2060                 }
2061
2062                 if ( !$options['changed'] ) {
2063                         $good = 0;
2064                         $total = 0;
2065                 } elseif ( $options['created'] ) {
2066                         $good = (int)$this->isCountable( $editInfo );
2067                         $total = 1;
2068                 } elseif ( $options['oldcountable'] !== null ) {
2069                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2070                         $total = 0;
2071                 } else {
2072                         $good = 0;
2073                         $total = 0;
2074                 }
2075
2076                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2077                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
2078
2079                 # If this is another user's talk page, update newtalk.
2080                 # Don't do this if $options['changed'] = false (null-edits) nor if
2081                 # it's a minor edit and the user doesn't want notifications for those.
2082                 if ( $options['changed']
2083                         && $this->mTitle->getNamespace() == NS_USER_TALK
2084                         && $shortTitle != $user->getTitleKey()
2085                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2086                 ) {
2087                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2088                                 $other = User::newFromName( $shortTitle, false );
2089                                 if ( !$other ) {
2090                                         wfDebug( __METHOD__ . ": invalid username\n" );
2091                                 } elseif ( User::isIP( $shortTitle ) ) {
2092                                         // An anonymous user
2093                                         $other->setNewtalk( true );
2094                                 } elseif ( $other->isLoggedIn() ) {
2095                                         $other->setNewtalk( true );
2096                                 } else {
2097                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2098                                 }
2099                         }
2100                 }
2101
2102                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2103                         MessageCache::singleton()->replace( $shortTitle, $text );
2104                 }
2105
2106                 if( $options['created'] ) {
2107                         self::onArticleCreate( $this->mTitle );
2108                 } else {
2109                         self::onArticleEdit( $this->mTitle );
2110                 }
2111
2112                 wfProfileOut( __METHOD__ );
2113         }
2114
2115         /**
2116          * Perform article updates on a special page creation.
2117          *
2118          * @param $rev Revision object
2119          *
2120          * @todo This is a shitty interface function. Kill it and replace the
2121          * other shitty functions like doEditUpdates and such so it's not needed
2122          * anymore.
2123          * @deprecated since 1.18, use doEditUpdates()
2124          */
2125         public function createUpdates( $rev ) {
2126                 global $wgUser;
2127                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2128         }
2129
2130         /**
2131          * This function is called right before saving the wikitext,
2132          * so we can do things like signatures and links-in-context.
2133          *
2134          * @param $text String article contents
2135          * @param $user User object: user doing the edit
2136          * @param $popts ParserOptions object: parser options, default options for
2137          *               the user loaded if null given
2138          * @return string article contents with altered wikitext markup (signatures
2139          *      converted, {{subst:}}, templates, etc.)
2140          */
2141         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2142                 global $wgParser, $wgUser;
2143                 $user = is_null( $user ) ? $wgUser : $user;
2144
2145                 if ( $popts === null ) {
2146                         $popts = ParserOptions::newFromUser( $user );
2147                 }
2148
2149                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2150         }
2151
2152         /**
2153          * Loads page_touched and returns a value indicating if it should be used
2154          * @return boolean true if not a redirect
2155          */
2156         public function checkTouched() {
2157                 if ( !$this->mDataLoaded ) {
2158                         $this->loadPageData();
2159                 }
2160                 return !$this->mIsRedirect;
2161         }
2162
2163         /**
2164          * Get the page_touched field
2165          * @return string containing GMT timestamp
2166          */
2167         public function getTouched() {
2168                 if ( !$this->mDataLoaded ) {
2169                         $this->loadPageData();
2170                 }
2171                 return $this->mTouched;
2172         }
2173
2174         /**
2175          * Get the page_latest field
2176          * @return integer rev_id of current revision
2177          */
2178         public function getLatest() {
2179                 if ( !$this->mDataLoaded ) {
2180                         $this->loadPageData();
2181                 }
2182                 return (int)$this->mLatest;
2183         }
2184
2185         /**
2186          * Edit an article without doing all that other stuff
2187          * The article must already exist; link tables etc
2188          * are not updated, caches are not flushed.
2189          *
2190          * @param $text String: text submitted
2191          * @param $user User The relevant user
2192          * @param $comment String: comment submitted
2193          * @param $minor Boolean: whereas it's a minor modification
2194          */
2195         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2196                 wfProfileIn( __METHOD__ );
2197
2198                 $dbw = wfGetDB( DB_MASTER );
2199                 $revision = new Revision( array(
2200                         'page'       => $this->getId(),
2201                         'text'       => $text,
2202                         'comment'    => $comment,
2203                         'minor_edit' => $minor ? 1 : 0,
2204                 ) );
2205                 $revision->insertOn( $dbw );
2206                 $this->updateRevisionOn( $dbw, $revision );
2207
2208                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2209
2210                 wfProfileOut( __METHOD__ );
2211         }
2212
2213         /**
2214          * The onArticle*() functions are supposed to be a kind of hooks
2215          * which should be called whenever any of the specified actions
2216          * are done.
2217          *
2218          * This is a good place to put code to clear caches, for instance.
2219          *
2220          * This is called on page move and undelete, as well as edit
2221          *
2222          * @param $title Title object
2223          */
2224         public static function onArticleCreate( $title ) {
2225                 # Update existence markers on article/talk tabs...
2226                 if ( $title->isTalkPage() ) {
2227                         $other = $title->getSubjectPage();
2228                 } else {
2229                         $other = $title->getTalkPage();
2230                 }
2231
2232                 $other->invalidateCache();
2233                 $other->purgeSquid();
2234
2235                 $title->touchLinks();
2236                 $title->purgeSquid();
2237                 $title->deleteTitleProtection();
2238         }
2239
2240         /**
2241          * Clears caches when article is deleted
2242          *
2243          * @param $title Title
2244          */
2245         public static function onArticleDelete( $title ) {
2246                 # Update existence markers on article/talk tabs...
2247                 if ( $title->isTalkPage() ) {
2248                         $other = $title->getSubjectPage();
2249                 } else {
2250                         $other = $title->getTalkPage();
2251                 }
2252
2253                 $other->invalidateCache();
2254                 $other->purgeSquid();
2255
2256                 $title->touchLinks();
2257                 $title->purgeSquid();
2258
2259                 # File cache
2260                 HTMLFileCache::clearFileCache( $title );
2261
2262                 # Messages
2263                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2264                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2265                 }
2266
2267                 # Images
2268                 if ( $title->getNamespace() == NS_FILE ) {
2269                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2270                         $update->doUpdate();
2271                 }
2272
2273                 # User talk pages
2274                 if ( $title->getNamespace() == NS_USER_TALK ) {
2275                         $user = User::newFromName( $title->getText(), false );
2276                         $user->setNewtalk( false );
2277                 }
2278
2279                 # Image redirects
2280                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2281         }
2282
2283         /**
2284          * Purge caches on page update etc
2285          *
2286          * @param $title Title object
2287          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2288          */
2289         public static function onArticleEdit( $title ) {
2290                 // Invalidate caches of articles which include this page
2291                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2292
2293
2294                 // Invalidate the caches of all pages which redirect here
2295                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2296
2297                 # Purge squid for this page only
2298                 $title->purgeSquid();
2299
2300                 # Clear file cache for this page only
2301                 HTMLFileCache::clearFileCache( $title );
2302         }
2303
2304         /**#@-*/
2305
2306         /**
2307          * Return a list of templates used by this article.
2308          * Uses the templatelinks table
2309          *
2310          * @return Array of Title objects
2311          */
2312         public function getUsedTemplates() {
2313                 $result = array();
2314                 $id = $this->mTitle->getArticleID();
2315
2316                 if ( $id == 0 ) {
2317                         return array();
2318                 }
2319
2320                 $dbr = wfGetDB( DB_SLAVE );
2321                 $res = $dbr->select( array( 'templatelinks' ),
2322                         array( 'tl_namespace', 'tl_title' ),
2323                         array( 'tl_from' => $id ),
2324                         __METHOD__ );
2325
2326                 if ( $res !== false ) {
2327                         foreach ( $res as $row ) {
2328                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2329                         }
2330                 }
2331
2332                 return $result;
2333         }
2334
2335         /**
2336          * Returns a list of hidden categories this page is a member of.
2337          * Uses the page_props and categorylinks tables.
2338          *
2339          * @return Array of Title objects
2340          */
2341         public function getHiddenCategories() {
2342                 $result = array();
2343                 $id = $this->mTitle->getArticleID();
2344
2345                 if ( $id == 0 ) {
2346                         return array();
2347                 }
2348
2349                 $dbr = wfGetDB( DB_SLAVE );
2350                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2351                         array( 'cl_to' ),
2352                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2353                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2354                         __METHOD__ );
2355
2356                 if ( $res !== false ) {
2357                         foreach ( $res as $row ) {
2358                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2359                         }
2360                 }
2361
2362                 return $result;
2363         }
2364
2365         /**
2366         * Return an applicable autosummary if one exists for the given edit.
2367         * @param $oldtext String: the previous text of the page.
2368         * @param $newtext String: The submitted text of the page.
2369         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2370         * @return string An appropriate autosummary, or an empty string.
2371         */
2372         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2373                 global $wgContLang;
2374
2375                 # Decide what kind of autosummary is needed.
2376
2377                 # Redirect autosummaries
2378                 $ot = Title::newFromRedirect( $oldtext );
2379                 $rt = Title::newFromRedirect( $newtext );
2380
2381                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2382                         $truncatedtext = $wgContLang->truncate(
2383                                 str_replace( "\n", ' ', $newtext ),
2384                                 max( 0, 250
2385                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2386                                         - strlen( $rt->getFullText() )
2387                                 ) );
2388                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2389                 }
2390
2391                 # New page autosummaries
2392                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2393                         # If they're making a new article, give its text, truncated, in the summary.
2394
2395                         $truncatedtext = $wgContLang->truncate(
2396                                 str_replace( "\n", ' ', $newtext ),
2397                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2398
2399                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2400                 }
2401
2402                 # Blanking autosummaries
2403                 if ( $oldtext != '' && $newtext == '' ) {
2404                         return wfMsgForContent( 'autosumm-blank' );
2405                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2406                         # Removing more than 90% of the article
2407
2408                         $truncatedtext = $wgContLang->truncate(
2409                                 $newtext,
2410                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2411
2412                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2413                 }
2414
2415                 # If we reach this point, there's no applicable autosummary for our case, so our
2416                 # autosummary is empty.
2417                 return '';
2418         }
2419
2420         /**
2421          * Auto-generates a deletion reason
2422          *
2423          * @param &$hasHistory Boolean: whether the page has a history
2424          * @return mixed String containing deletion reason or empty string, or boolean false
2425          *    if no revision occurred
2426          */
2427         public function getAutoDeleteReason( &$hasHistory ) {
2428                 global $wgContLang;
2429
2430                 $dbw = wfGetDB( DB_MASTER );
2431                 // Get the last revision
2432                 $rev = Revision::newFromTitle( $this->getTitle() );
2433
2434                 if ( is_null( $rev ) ) {
2435                         return false;
2436                 }
2437
2438                 // Get the article's contents
2439                 $contents = $rev->getText();
2440                 $blank = false;
2441
2442                 // If the page is blank, use the text from the previous revision,
2443                 // which can only be blank if there's a move/import/protect dummy revision involved
2444                 if ( $contents == '' ) {
2445                         $prev = $rev->getPrevious();
2446
2447                         if ( $prev )    {
2448                                 $contents = $prev->getText();
2449                                 $blank = true;
2450                         }
2451                 }
2452
2453                 // Find out if there was only one contributor
2454                 // Only scan the last 20 revisions
2455                 $res = $dbw->select( 'revision', 'rev_user_text',
2456                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2457                         __METHOD__,
2458                         array( 'LIMIT' => 20 )
2459                 );
2460
2461                 if ( $res === false ) {
2462                         // This page has no revisions, which is very weird
2463                         return false;
2464                 }
2465
2466                 $hasHistory = ( $res->numRows() > 1 );
2467                 $row = $dbw->fetchObject( $res );
2468
2469                 if ( $row ) { // $row is false if the only contributor is hidden
2470                         $onlyAuthor = $row->rev_user_text;
2471                         // Try to find a second contributor
2472                         foreach ( $res as $row ) {
2473                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2474                                         $onlyAuthor = false;
2475                                         break;
2476                                 }
2477                         }
2478                 } else {
2479                         $onlyAuthor = false;
2480                 }
2481
2482                 // Generate the summary with a '$1' placeholder
2483                 if ( $blank ) {
2484                         // The current revision is blank and the one before is also
2485                         // blank. It's just not our lucky day
2486                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2487                 } else {
2488                         if ( $onlyAuthor ) {
2489                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2490                         } else {
2491                                 $reason = wfMsgForContent( 'excontent', '$1' );
2492                         }
2493                 }
2494
2495                 if ( $reason == '-' ) {
2496                         // Allow these UI messages to be blanked out cleanly
2497                         return '';
2498                 }
2499
2500                 // Replace newlines with spaces to prevent uglyness
2501                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2502                 // Calculate the maximum amount of chars to get
2503                 // Max content length = max comment length - length of the comment (excl. $1)
2504                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2505                 $contents = $wgContLang->truncate( $contents, $maxLength );
2506                 // Remove possible unfinished links
2507                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2508                 // Now replace the '$1' placeholder
2509                 $reason = str_replace( '$1', $contents, $reason );
2510
2511                 return $reason;
2512         }
2513
2514         /**
2515         * Get parser options suitable for rendering the primary article wikitext
2516         * @param User|string $user User object or 'canonical'
2517         * @return ParserOptions
2518         */
2519         public function makeParserOptions( $user ) {
2520                 global $wgContLang;
2521                 if ( $user instanceof User ) { // settings per user (even anons)
2522                         $options = ParserOptions::newFromUser( $user );
2523                 } else { // canonical settings
2524                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
2525                 }
2526                 $options->enableLimitReport(); // show inclusion/loop reports
2527                 $options->setTidy( true ); // fix bad HTML
2528                 return $options;
2529         }
2530
2531         /**
2532          * Update all the appropriate counts in the category table, given that
2533          * we've added the categories $added and deleted the categories $deleted.
2534          *
2535          * @param $added array   The names of categories that were added
2536          * @param $deleted array The names of categories that were deleted
2537          */
2538         public function updateCategoryCounts( $added, $deleted ) {
2539                 $ns = $this->mTitle->getNamespace();
2540                 $dbw = wfGetDB( DB_MASTER );
2541
2542                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2543                 # exist, we might legitimately not create it, but it's simpler to just
2544                 # create it and then give it a negative value, since the value is bogus
2545                 # anyway.
2546                 #
2547                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2548                 $insertCats = array_merge( $added, $deleted );
2549                 if ( !$insertCats ) {
2550                         # Okay, nothing to do
2551                         return;
2552                 }
2553
2554                 $insertRows = array();
2555
2556                 foreach ( $insertCats as $cat ) {
2557                         $insertRows[] = array(
2558                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2559                                 'cat_title' => $cat
2560                         );
2561                 }
2562                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2563
2564                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2565                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2566
2567                 if ( $ns == NS_CATEGORY ) {
2568                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2569                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2570                 } elseif ( $ns == NS_FILE ) {
2571                         $addFields[]    = 'cat_files = cat_files + 1';
2572                         $removeFields[] = 'cat_files = cat_files - 1';
2573                 }
2574
2575                 if ( $added ) {
2576                         $dbw->update(
2577                                 'category',
2578                                 $addFields,
2579                                 array( 'cat_title' => $added ),
2580                                 __METHOD__
2581                         );
2582                 }
2583
2584                 if ( $deleted ) {
2585                         $dbw->update(
2586                                 'category',
2587                                 $removeFields,
2588                                 array( 'cat_title' => $deleted ),
2589                                 __METHOD__
2590                         );
2591                 }
2592         }
2593
2594         /**
2595          * Updates cascading protections
2596          *
2597          * @param $parserOutput ParserOutput object for the current version
2598          */
2599         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2600                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2601                         return;
2602                 }
2603
2604                 // templatelinks table may have become out of sync,
2605                 // especially if using variable-based transclusions.
2606                 // For paranoia, check if things have changed and if
2607                 // so apply updates to the database. This will ensure
2608                 // that cascaded protections apply as soon as the changes
2609                 // are visible.
2610
2611                 # Get templates from templatelinks
2612                 $id = $this->mTitle->getArticleID();
2613
2614                 $tlTemplates = array();
2615
2616                 $dbr = wfGetDB( DB_SLAVE );
2617                 $res = $dbr->select( array( 'templatelinks' ),
2618                         array( 'tl_namespace', 'tl_title' ),
2619                         array( 'tl_from' => $id ),
2620                         __METHOD__
2621                 );
2622
2623                 foreach ( $res as $row ) {
2624                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2625                 }
2626
2627                 # Get templates from parser output.
2628                 $poTemplates = array();
2629                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2630                         foreach ( $templates as $dbk => $id ) {
2631                                 $poTemplates["$ns:$dbk"] = true;
2632                         }
2633                 }
2634
2635                 # Get the diff
2636                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2637
2638                 if ( count( $templates_diff ) > 0 ) {
2639                         # Whee, link updates time.
2640                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2641                         $u->doUpdate();
2642                 }
2643         }
2644
2645         /**
2646          * @deprecated since 1.18
2647          */
2648         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2649                 global $wgUser;
2650                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2651         }
2652
2653         /**
2654          * @deprecated since 1.18
2655          */
2656         public function viewUpdates() {
2657                 global $wgUser;
2658                 return $this->doViewUpdates( $wgUser );
2659         }
2660
2661         /**
2662          * @deprecated since 1.18
2663          */
2664         public function useParserCache( $oldid ) {
2665                 global $wgUser;
2666                 return $this->isParserCacheUsed( $wgUser, $oldid );
2667         }
2668 }