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