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          * @protected
  19          */
  20         public $mTitle = null;
  21
  22         /**@{{
  23          * @protected
  24          */
  25         public $mCounter = -1;               // !< Integer (-1 means "not loaded")
  26         public $mDataLoaded = false;         // !< Boolean
  27         public $mIsRedirect = false;         // !< Boolean
  28         public $mLatest = false;             // !< Boolean
  29         public $mPreparedEdit = false;           // !< Array
  30         public $mRedirectTarget = null;          // !< Title object
  31         public $mLastRevision = null;            // !< Revision object
  32         public $mTimestamp = '';             // !< String
  33         public $mTouched = '19700101000000'; // !< String
  34         /**@}}*/
  35
  36         /**
  37          * @protected
  38          * @var ParserOptions: ParserOptions object for $wgUser articles
  39          */
  40         public $mParserOptions;
  41
  42         /**
  43          * Constructor and clear the article
  44          * @param $title Title Reference to a Title object.
  45          */
  46         public function __construct( Title $title ) {
  47                 $this->mTitle = $title;
  48         }
  49
  50         /**
  51          * Create a WikiPage object of the appropriate class for the given title.
  52          *
  53          * @param $title Title
  54          * @return WikiPage object of the appropriate type
  55          */
  56         public static function factory( Title $title ) {
  57                 switch( $title->getNamespace() ) {
  58                         case NS_MEDIA:
  59                                 throw new MWException( "NS_MEDIA is a virtual namespace" );
  60                         case NS_FILE:
  61                                 $page = new WikiFilePage( $title );
  62                                 break;
  63                         case NS_CATEGORY:
  64                                 $page = new WikiCategoryPage( $title );
  65                                 break;
  66                         default:
  67                                 $page = new WikiPage( $title );
  68                 }
  69
  70                 return $page;
  71         }
  72
  73         /**
  74          * Constructor from a page id
  75          *
  76          * Always override this for all subclasses (until we use PHP with LSB)
  77          *
  78          * @param $id Int article ID to load
  79          */
  80         public static function newFromID( $id ) {
  81                 $t = Title::newFromID( $id );
  82                 # @todo FIXME: Doesn't inherit right
  83                 return $t == null ? null : new self( $t );
  84                 # return $t == null ? null : new static( $t ); // PHP 5.3
  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          * @return Array
  94          */
  95         public function getActionOverrides() {
  96                 return array();
  97         }
  98
  99         /**
 100          * If this page is a redirect, get its target
 101          *
 102          * The target will be fetched from the redirect table if possible.
 103          * If this page doesn't have an entry there, call insertRedirect()
 104          * @return Title|mixed object, or null if this page is not a redirect
 105          */
 106         public function getRedirectTarget() {
 107                 if ( !$this->mTitle->isRedirect() ) {
 108                         return null;
 109                 }
 110
 111                 if ( $this->mRedirectTarget !== null ) {
 112                         return $this->mRedirectTarget;
 113                 }
 114
 115                 # Query the redirect table
 116                 $dbr = wfGetDB( DB_SLAVE );
 117                 $row = $dbr->selectRow( 'redirect',
 118                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 119                         array( 'rd_from' => $this->getId() ),
 120                         __METHOD__
 121                 );
 122
 123                 // rd_fragment and rd_interwiki were added later, populate them if empty
 124                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 125                         return $this->mRedirectTarget = Title::makeTitle(
 126                                 $row->rd_namespace, $row->rd_title,
 127                                 $row->rd_fragment, $row->rd_interwiki );
 128                 }
 129
 130                 # This page doesn't have an entry in the redirect table
 131                 return $this->mRedirectTarget = $this->insertRedirect();
 132         }
 133
 134         /**
 135          * Insert an entry for this page into the redirect table.
 136          *
 137          * Don't call this function directly unless you know what you're doing.
 138          * @return Title object or null if not a redirect
 139          */
 140         public function insertRedirect() {
 141                 // recurse through to only get the final target
 142                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 143                 if ( !$retval ) {
 144                         return null;
 145                 }
 146                 $this->insertRedirectEntry( $retval );
 147                 return $retval;
 148         }
 149
 150         /**
 151          * Insert or update the redirect table entry for this page to indicate
 152          * it redirects to $rt .
 153          * @param $rt Title redirect target
 154          */
 155         public function insertRedirectEntry( $rt ) {
 156                 $dbw = wfGetDB( DB_MASTER );
 157                 $dbw->replace( 'redirect', array( 'rd_from' ),
 158                         array(
 159                                 'rd_from'               => $this->getId(),
 160                                 'rd_namespace'  => $rt->getNamespace(),
 161                                 'rd_title'              => $rt->getDBkey(),
 162                                 'rd_fragment'   => $rt->getFragment(),
 163                                 'rd_interwiki'  => $rt->getInterwiki(),
 164                         ),
 165                         __METHOD__
 166                 );
 167         }
 168
 169         /**
 170          * Get the Title object or URL this page redirects to
 171          *
 172          * @return mixed false, Title of in-wiki target, or string with URL
 173          */
 174         public function followRedirect() {
 175                 return $this->getRedirectURL( $this->getRedirectTarget() );
 176         }
 177
 178         /**
 179          * Get the Title object or URL to use for a redirect. We use Title
 180          * objects for same-wiki, non-special redirects and URLs for everything
 181          * else.
 182          * @param $rt Title Redirect target
 183          * @return mixed false, Title object of local target, or string with URL
 184          */
 185         public function getRedirectURL( $rt ) {
 186                 if ( $rt ) {
 187                         if ( $rt->getInterwiki() != '' ) {
 188                                 if ( $rt->isLocal() ) {
 189                                         // Offsite wikis need an HTTP redirect.
 190                                         //
 191                                         // This can be hard to reverse and may produce loops,
 192                                         // so they may be disabled in the site configuration.
 193                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 194                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 195                                 }
 196                         } else {
 197                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 198                                         // Gotta handle redirects to special pages differently:
 199                                         // Fill the HTTP response "Location" header and ignore
 200                                         // the rest of the page we're on.
 201                                         //
 202                                         // This can be hard to reverse, so they may be disabled.
 203                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 204                                                 // rolleyes
 205                                         } else {
 206                                                 return $rt->getFullURL();
 207                                         }
 208                                 }
 209
 210                                 return $rt;
 211                         }
 212                 }
 213
 214                 // No or invalid redirect
 215                 return false;
 216         }
 217
 218         /**
 219          * Get the title object of the article
 220          * @return Title object of this page
 221          */
 222         public function getTitle() {
 223                 return $this->mTitle;
 224         }
 225
 226         /**
 227          * Clear the object
 228          */
 229         public function clear() {
 230                 $this->mDataLoaded = false;
 231
 232                 $this->mCounter = -1; # Not loaded
 233                 $this->mRedirectTarget = null; # Title object if set
 234                 $this->mLastRevision = null; # Latest revision
 235                 $this->mTimestamp = '';
 236                 $this->mTouched = '19700101000000';
 237                 $this->mIsRedirect = false;
 238                 $this->mLatest = false;
 239                 $this->mPreparedEdit = false;
 240         }
 241
 242         /**
 243          * Get the text that needs to be saved in order to undo all revisions
 244          * between $undo and $undoafter. Revisions must belong to the same page,
 245          * must exist and must not be deleted
 246          * @param $undo Revision
 247          * @param $undoafter Revision Must be an earlier revision than $undo
 248          * @return mixed string on success, false on failure
 249          */
 250         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 251                 $cur_text = $this->getRawText();
 252                 if ( $cur_text === false ) {
 253                         return false; // no page
 254                 }
 255                 $undo_text = $undo->getText();
 256                 $undoafter_text = $undoafter->getText();
 257
 258                 if ( $cur_text == $undo_text ) {
 259                         # No use doing a merge if it's just a straight revert.
 260                         return $undoafter_text;
 261                 }
 262
 263                 $undone_text = '';
 264
 265                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 266                         return false;
 267                 }
 268
 269                 return $undone_text;
 270         }
 271
 272         /**
 273          * Return the list of revision fields that should be selected to create
 274          * a new page.
 275          */
 276         public static function selectFields() {
 277                 return array(
 278                         'page_id',
 279                         'page_namespace',
 280                         'page_title',
 281                         'page_restrictions',
 282                         'page_counter',
 283                         'page_is_redirect',
 284                         'page_is_new',
 285                         'page_random',
 286                         'page_touched',
 287                         'page_latest',
 288                         'page_len',
 289                 );
 290         }
 291
 292         /**
 293          * Fetch a page record with the given conditions
 294          * @param $dbr DatabaseBase object
 295          * @param $conditions Array
 296          * @return mixed Database result resource, or false on failure
 297          */
 298         protected function pageData( $dbr, $conditions ) {
 299                 $fields = self::selectFields();
 300
 301                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 302
 303                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 304
 305                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 306
 307                 return $row;
 308         }
 309
 310         /**
 311          * Fetch a page record matching the Title object's namespace and title
 312          * using a sanitized title string
 313          *
 314          * @param $dbr DatabaseBase object
 315          * @param $title Title object
 316          * @return mixed Database result resource, or false on failure
 317          */
 318         public function pageDataFromTitle( $dbr, $title ) {
 319                 return $this->pageData( $dbr, array(
 320                         'page_namespace' => $title->getNamespace(),
 321                         'page_title'     => $title->getDBkey() ) );
 322         }
 323
 324         /**
 325          * Fetch a page record matching the requested ID
 326          *
 327          * @param $dbr DatabaseBase
 328          * @param $id Integer
 329          * @return mixed Database result resource, or false on failure
 330          */
 331         public function pageDataFromId( $dbr, $id ) {
 332                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 333         }
 334
 335         /**
 336          * Set the general counter, title etc data loaded from
 337          * some source.
 338          *
 339          * @param $data Object|String $res->fetchObject() object or the string "fromdb" to reload
 340          */
 341         public function loadPageData( $data = 'fromdb' ) {
 342                 if ( $data === 'fromdb' ) {
 343                         $dbr = wfGetDB( DB_SLAVE );
 344                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 345                 }
 346
 347                 $lc = LinkCache::singleton();
 348
 349                 if ( $data ) {
 350                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 351
 352                         $this->mTitle->loadFromRow( $data );
 353
 354                         # Old-fashioned restrictions
 355                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 356
 357                         $this->mCounter     = intval( $data->page_counter );
 358                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 359                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 360                         $this->mLatest      = intval( $data->page_latest );
 361                 } else {
 362                         $lc->addBadLinkObj( $this->mTitle );
 363
 364                         $this->mTitle->loadFromRow( false );
 365                 }
 366
 367                 $this->mDataLoaded = true;
 368         }
 369
 370         /**
 371          * @return int Page ID
 372          */
 373         public function getId() {
 374                 return $this->mTitle->getArticleID();
 375         }
 376
 377         /**
 378          * @return bool Whether or not the page exists in the database
 379          */
 380         public function exists() {
 381                 return $this->getId() > 0;
 382         }
 383
 384         /**
 385          * Check if this page is something we're going to be showing
 386          * some sort of sensible content for. If we return false, page
 387          * views (plain action=view) will return an HTTP 404 response,
 388          * so spiders and robots can know they're following a bad link.
 389          *
 390          * @return bool
 391          */
 392         public function hasViewableContent() {
 393                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 394         }
 395
 396         /**
 397          * @return int The view count for the page
 398          */
 399         public function getCount() {
 400                 if ( -1 == $this->mCounter ) {
 401                         $id = $this->getId();
 402
 403                         if ( $id == 0 ) {
 404                                 $this->mCounter = 0;
 405                         } else {
 406                                 $dbr = wfGetDB( DB_SLAVE );
 407                                 $this->mCounter = $dbr->selectField( 'page',
 408                                         'page_counter',
 409                                         array( 'page_id' => $id ),
 410                                         __METHOD__
 411                                 );
 412                         }
 413                 }
 414
 415                 return $this->mCounter;
 416         }
 417
 418         /**
 419          * Determine whether a page would be suitable for being counted as an
 420          * article in the site_stats table based on the title & its content
 421          *
 422          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 423          *        if false, the current database state will be used
 424          * @return Boolean
 425          */
 426         public function isCountable( $editInfo = false ) {
 427                 global $wgArticleCountMethod;
 428
 429                 if ( !$this->mTitle->isContentPage() ) {
 430                         return false;
 431                 }
 432
 433                 $text = $editInfo ? $editInfo->pst : false;
 434
 435                 if ( $this->isRedirect( $text ) ) {
 436                         return false;
 437                 }
 438
 439                 switch ( $wgArticleCountMethod ) {
 440                 case 'any':
 441                         return true;
 442                 case 'comma':
 443                         if ( $text === false ) {
 444                                 $text = $this->getRawText();
 445                         }
 446                         return strpos( $text,  ',' ) !== false;
 447                 case 'link':
 448                         if ( $editInfo ) {
 449                                 // ParserOutput::getLinks() is a 2D array of page links, so
 450                                 // to be really correct we would need to recurse in the array
 451                                 // but the main array should only have items in it if there are
 452                                 // links.
 453                                 return (bool)count( $editInfo->output->getLinks() );
 454                         } else {
 455                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 456                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 457                         }
 458                 }
 459         }
 460
 461         /**
 462          * Tests if the article text represents a redirect
 463          *
 464          * @param $text mixed string containing article contents, or boolean
 465          * @return bool
 466          */
 467         public function isRedirect( $text = false ) {
 468                 if ( $text === false ) {
 469                         if ( !$this->mDataLoaded ) {
 470                                 $this->loadPageData();
 471                         }
 472
 473                         return (bool)$this->mIsRedirect;
 474                 } else {
 475                         return Title::newFromRedirect( $text ) !== null;
 476                 }
 477         }
 478
 479         /**
 480          * Loads everything except the text
 481          * This isn't necessary for all uses, so it's only done if needed.
 482          */
 483         protected function loadLastEdit() {
 484                 if ( $this->mLastRevision !== null ) {
 485                         return; // already loaded
 486                 }
 487
 488                 $latest = $this->getLatest();
 489                 if ( !$latest ) {
 490                         return; // page doesn't exist or is missing page_latest info
 491                 }
 492
 493                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 494                 if ( $revision ) { // sanity
 495                         $this->setLastEdit( $revision );
 496                 }
 497         }
 498
 499         /**
 500          * Set the latest revision
 501          */
 502         protected function setLastEdit( Revision $revision ) {
 503                 $this->mLastRevision = $revision;
 504                 $this->mTimestamp = $revision->getTimestamp();
 505         }
 506
 507         /**
 508          * Get the latest revision
 509          * @return Revision|null
 510          */
 511         public function getRevision() {
 512                 $this->loadLastEdit();
 513                 if ( $this->mLastRevision ) {
 514                         return $this->mLastRevision;
 515                 }
 516                 return null;
 517         }
 518
 519         /**
 520          * Get the text of the current revision. No side-effects...
 521          *
 522          * @param $audience Integer: one of:
 523          *      Revision::FOR_PUBLIC       to be displayed to all users
 524          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 525          *      Revision::RAW              get the text regardless of permissions
 526          * @return String|false The text of the current revision
 527          */
 528         public function getText( $audience = Revision::FOR_PUBLIC ) {
 529                 $this->loadLastEdit();
 530                 if ( $this->mLastRevision ) {
 531                         return $this->mLastRevision->getText( $audience );
 532                 }
 533                 return false;
 534         }
 535
 536         /**
 537          * Get the text of the current revision. No side-effects...
 538          *
 539          * @return String|false The text of the current revision
 540          */
 541         public function getRawText() {
 542                 $this->loadLastEdit();
 543                 if ( $this->mLastRevision ) {
 544                         return $this->mLastRevision->getRawText();
 545                 }
 546                 return false;
 547         }
 548
 549         /**
 550          * @return string MW timestamp of last article revision
 551          */
 552         public function getTimestamp() {
 553                 // Check if the field has been filled by ParserCache::get()
 554                 if ( !$this->mTimestamp ) {
 555                         $this->loadLastEdit();
 556                 }
 557                 return wfTimestamp( TS_MW, $this->mTimestamp );
 558         }
 559
 560         /**
 561          * Set the page timestamp (use only to avoid DB queries)
 562          * @param $ts string MW timestamp of last article revision
 563          * @return void
 564          */
 565         public function setTimestamp( $ts ) {
 566                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 567         }
 568
 569         /**
 570          * @param $audience Integer: one of:
 571          *      Revision::FOR_PUBLIC       to be displayed to all users
 572          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 573          *      Revision::RAW              get the text regardless of permissions
 574          * @return int user ID for the user that made the last article revision
 575          */
 576         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 577                 $this->loadLastEdit();
 578                 if ( $this->mLastRevision ) {
 579                         return $this->mLastRevision->getUser( $audience );
 580                 } else {
 581                         return -1;
 582                 }
 583         }
 584
 585         /**
 586          * @param $audience Integer: one of:
 587          *      Revision::FOR_PUBLIC       to be displayed to all users
 588          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 589          *      Revision::RAW              get the text regardless of permissions
 590          * @return string username of the user that made the last article revision
 591          */
 592         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 593                 $this->loadLastEdit();
 594                 if ( $this->mLastRevision ) {
 595                         return $this->mLastRevision->getUserText( $audience );
 596                 } else {
 597                         return '';
 598                 }
 599         }
 600
 601         /**
 602          * @param $audience Integer: one of:
 603          *      Revision::FOR_PUBLIC       to be displayed to all users
 604          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 605          *      Revision::RAW              get the text regardless of permissions
 606          * @return string Comment stored for the last article revision
 607          */
 608         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 609                 $this->loadLastEdit();
 610                 if ( $this->mLastRevision ) {
 611                         return $this->mLastRevision->getComment( $audience );
 612                 } else {
 613                         return '';
 614                 }
 615         }
 616
 617         /**
 618          * Returns true if last revision was marked as "minor edit"
 619          *
 620          * @return boolean Minor edit indicator for the last article revision.
 621          */
 622         public function getMinorEdit() {
 623                 $this->loadLastEdit();
 624                 if ( $this->mLastRevision ) {
 625                         return $this->mLastRevision->isMinor();
 626                 } else {
 627                         return false;
 628                 }
 629         }
 630
 631         /**
 632          * Get a list of users who have edited this article, not including the user who made
 633          * the most recent revision, which you can get from $article->getUser() if you want it
 634          * @return UserArrayFromResult
 635          */
 636         public function getContributors() {
 637                 # @todo FIXME: This is expensive; cache this info somewhere.
 638
 639                 $dbr = wfGetDB( DB_SLAVE );
 640
 641                 if ( $dbr->implicitGroupby() ) {
 642                         $realNameField = 'user_real_name';
 643                 } else {
 644                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 645                 }
 646
 647                 $tables = array( 'revision', 'user' );
 648
 649                 $fields = array(
 650                         'rev_user as user_id',
 651                         'rev_user_text AS user_name',
 652                         $realNameField,
 653                         'MAX(rev_timestamp) AS timestamp',
 654                 );
 655
 656                 $conds = array( 'rev_page' => $this->getId() );
 657
 658                 // The user who made the top revision gets credited as "this page was last edited by
 659                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 660                 $user = $this->getUser();
 661                 if ( $user ) {
 662                         $conds[] = "rev_user != $user";
 663                 } else {
 664                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 665                 }
 666
 667                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 668
 669                 $jconds = array(
 670                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 671                 );
 672
 673                 $options = array(
 674                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 675                         'ORDER BY' => 'timestamp DESC',
 676                 );
 677
 678                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 679                 return new UserArrayFromResult( $res );
 680         }
 681
 682         /**
 683          * Should the parser cache be used?
 684          *
 685          * @param $user User The relevant user
 686          * @return boolean
 687          */
 688         public function isParserCacheUsed( User $user, $oldid ) {
 689                 global $wgEnableParserCache;
 690
 691                 return $wgEnableParserCache
 692                         && $user->getStubThreshold() == 0
 693                         && $this->exists()
 694                         && empty( $oldid )
 695                         && !$this->mTitle->isCssOrJsPage()
 696                         && !$this->mTitle->isCssJsSubpage();
 697         }
 698
 699         /**
 700          * Perform the actions of a page purging
 701          */
 702         public function doPurge() {
 703                 global $wgUseSquid;
 704
 705                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 706                         return false;
 707                 }
 708
 709                 // Invalidate the cache
 710                 $this->mTitle->invalidateCache();
 711                 $this->clear();
 712
 713                 if ( $wgUseSquid ) {
 714                         // Commit the transaction before the purge is sent
 715                         $dbw = wfGetDB( DB_MASTER );
 716                         $dbw->commit();
 717
 718                         // Send purge
 719                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 720                         $update->doUpdate();
 721                 }
 722
 723                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 724                         if ( $this->getId() == 0 ) {
 725                                 $text = false;
 726                         } else {
 727                                 $text = $this->getRawText();
 728                         }
 729
 730                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 731                 }
 732         }
 733
 734         /**
 735          * Insert a new empty page record for this article.
 736          * This *must* be followed up by creating a revision
 737          * and running $this->updateRevisionOn( ... );
 738          * or else the record will be left in a funky state.
 739          * Best if all done inside a transaction.
 740          *
 741          * @param $dbw DatabaseBase
 742          * @return int The newly created page_id key, or false if the title already existed
 743          * @private
 744          */
 745         public function insertOn( $dbw ) {
 746                 wfProfileIn( __METHOD__ );
 747
 748                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 749                 $dbw->insert( 'page', array(
 750                         'page_id'           => $page_id,
 751                         'page_namespace'    => $this->mTitle->getNamespace(),
 752                         'page_title'        => $this->mTitle->getDBkey(),
 753                         'page_counter'      => 0,
 754                         'page_restrictions' => '',
 755                         'page_is_redirect'  => 0, # Will set this shortly...
 756                         'page_is_new'       => 1,
 757                         'page_random'       => wfRandom(),
 758                         'page_touched'      => $dbw->timestamp(),
 759                         'page_latest'       => 0, # Fill this in shortly...
 760                         'page_len'          => 0, # Fill this in shortly...
 761                 ), __METHOD__, 'IGNORE' );
 762
 763                 $affected = $dbw->affectedRows();
 764
 765                 if ( $affected ) {
 766                         $newid = $dbw->insertId();
 767                         $this->mTitle->resetArticleID( $newid );
 768                 }
 769                 wfProfileOut( __METHOD__ );
 770
 771                 return $affected ? $newid : false;
 772         }
 773
 774         /**
 775          * Update the page record to point to a newly saved revision.
 776          *
 777          * @param $dbw DatabaseBase: object
 778          * @param $revision Revision: For ID number, and text used to set
 779                                                 length and redirect status fields
 780          * @param $lastRevision Integer: if given, will not overwrite the page field
 781          *                      when different from the currently set value.
 782          *                      Giving 0 indicates the new page flag should be set
 783          *                      on.
 784          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 785          *                           removing rows in redirect table.
 786          * @return bool true on success, false on failure
 787          * @private
 788          */
 789         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 790                 wfProfileIn( __METHOD__ );
 791
 792                 $text = $revision->getText();
 793                 $rt = Title::newFromRedirectRecurse( $text );
 794
 795                 $conditions = array( 'page_id' => $this->getId() );
 796
 797                 if ( !is_null( $lastRevision ) ) {
 798                         # An extra check against threads stepping on each other
 799                         $conditions['page_latest'] = $lastRevision;
 800                 }
 801
 802                 $dbw->update( 'page',
 803                         array( /* SET */
 804                                 'page_latest'      => $revision->getId(),
 805                                 'page_touched'     => $dbw->timestamp(),
 806                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 807                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 808                                 'page_len'         => strlen( $text ),
 809                         ),
 810                         $conditions,
 811                         __METHOD__ );
 812
 813                 $result = $dbw->affectedRows() != 0;
 814                 if ( $result ) {
 815                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 816                 }
 817
 818                 wfProfileOut( __METHOD__ );
 819                 return $result;
 820         }
 821
 822         /**
 823          * Add row to the redirect table if this is a redirect, remove otherwise.
 824          *
 825          * @param $dbw DatabaseBase
 826          * @param $redirectTitle Title object pointing to the redirect target,
 827          *                       or NULL if this is not a redirect
 828          * @param $lastRevIsRedirect If given, will optimize adding and
 829          *                           removing rows in redirect table.
 830          * @return bool true on success, false on failure
 831          * @private
 832          */
 833         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 834                 // Always update redirects (target link might have changed)
 835                 // Update/Insert if we don't know if the last revision was a redirect or not
 836                 // Delete if changing from redirect to non-redirect
 837                 $isRedirect = !is_null( $redirectTitle );
 838
 839                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 840                         return true;
 841                 }
 842
 843                 wfProfileIn( __METHOD__ );
 844                 if ( $isRedirect ) {
 845                         $this->insertRedirectEntry( $redirectTitle );
 846                 } else {
 847                         // This is not a redirect, remove row from redirect table
 848                         $where = array( 'rd_from' => $this->getId() );
 849                         $dbw->delete( 'redirect', $where, __METHOD__ );
 850                 }
 851
 852                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 853                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 854                 }
 855                 wfProfileOut( __METHOD__ );
 856
 857                 return ( $dbw->affectedRows() != 0 );
 858         }
 859
 860         /**
 861          * If the given revision is newer than the currently set page_latest,
 862          * update the page record. Otherwise, do nothing.
 863          *
 864          * @param $dbw Database object
 865          * @param $revision Revision object
 866          * @return mixed
 867          */
 868         public function updateIfNewerOn( $dbw, $revision ) {
 869                 wfProfileIn( __METHOD__ );
 870
 871                 $row = $dbw->selectRow(
 872                         array( 'revision', 'page' ),
 873                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 874                         array(
 875                                 'page_id' => $this->getId(),
 876                                 'page_latest=rev_id' ),
 877                         __METHOD__ );
 878
 879                 if ( $row ) {
 880                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 881                                 wfProfileOut( __METHOD__ );
 882                                 return false;
 883                         }
 884                         $prev = $row->rev_id;
 885                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 886                 } else {
 887                         # No or missing previous revision; mark the page as new
 888                         $prev = 0;
 889                         $lastRevIsRedirect = null;
 890                 }
 891
 892                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 893
 894                 wfProfileOut( __METHOD__ );
 895                 return $ret;
 896         }
 897
 898         /**
 899          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 900          * @param $text String: new text of the section
 901          * @param $summary String: new section's subject, only if $section is 'new'
 902          * @param $edittime String: revision timestamp or null to use the current revision
 903          * @return string Complete article text, or null if error
 904          */
 905         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 906                 wfProfileIn( __METHOD__ );
 907
 908                 if ( strval( $section ) == '' ) {
 909                         // Whole-page edit; let the whole text through
 910                 } else {
 911                         if ( is_null( $edittime ) ) {
 912                                 $rev = Revision::newFromTitle( $this->mTitle );
 913                         } else {
 914                                 $dbw = wfGetDB( DB_MASTER );
 915                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 916                         }
 917
 918                         if ( !$rev ) {
 919                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 920                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 921                                 wfProfileOut( __METHOD__ );
 922                                 return null;
 923                         }
 924
 925                         $oldtext = $rev->getText();
 926
 927                         if ( $section == 'new' ) {
 928                                 # Inserting a new section
 929                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 930                                 $text = strlen( trim( $oldtext ) ) > 0
 931                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 932                                                 : "{$subject}{$text}";
 933                         } else {
 934                                 # Replacing an existing section; roll out the big guns
 935                                 global $wgParser;
 936
 937                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 938                         }
 939                 }
 940
 941                 wfProfileOut( __METHOD__ );
 942                 return $text;
 943         }
 944
 945         /**
 946          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 947          * @param $flags Int
 948          * @return Int updated $flags
 949          */
 950         function checkFlags( $flags ) {
 951                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
 952                         if ( $this->mTitle->getArticleID() ) {
 953                                 $flags |= EDIT_UPDATE;
 954                         } else {
 955                                 $flags |= EDIT_NEW;
 956                         }
 957                 }
 958
 959                 return $flags;
 960         }
 961
 962         /**
 963          * Change an existing article or create a new article. Updates RC and all necessary caches,
 964          * optionally via the deferred update array.
 965          *
 966          * @param $text String: new text
 967          * @param $summary String: edit summary
 968          * @param $flags Integer bitfield:
 969          *      EDIT_NEW
 970          *          Article is known or assumed to be non-existent, create a new one
 971          *      EDIT_UPDATE
 972          *          Article is known or assumed to be pre-existing, update it
 973          *      EDIT_MINOR
 974          *          Mark this edit minor, if the user is allowed to do so
 975          *      EDIT_SUPPRESS_RC
 976          *          Do not log the change in recentchanges
 977          *      EDIT_FORCE_BOT
 978          *          Mark the edit a "bot" edit regardless of user rights
 979          *      EDIT_DEFER_UPDATES
 980          *          Defer some of the updates until the end of index.php
 981          *      EDIT_AUTOSUMMARY
 982          *          Fill in blank summaries with generated text where possible
 983          *
 984          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
 985          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
 986          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
 987          * edit-already-exists error will be returned. These two conditions are also possible with
 988          * auto-detection due to MediaWiki's performance-optimised locking strategy.
 989          *
 990          * @param $baseRevId the revision ID this edit was based off, if any
 991          * @param $user User the user doing the edit
 992          *
 993          * @return Status object. Possible errors:
 994          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
 995          *     edit-gone-missing:       In update mode, but the article didn't exist
 996          *     edit-conflict:           In update mode, the article changed unexpectedly
 997          *     edit-no-change:          Warning that the text was the same as before
 998          *     edit-already-exists:     In creation mode, but the article already exists
 999          *
1000          *  Extensions may define additional errors.
1001          *
1002          *  $return->value will contain an associative array with members as follows:
1003          *     new:                     Boolean indicating if the function attempted to create a new article
1004          *     revision:                The revision object for the inserted revision, or null
1005          *
1006          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1007          */
1008         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1009                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1010
1011                 # Low-level sanity check
1012                 if ( $this->mTitle->getText() === '' ) {
1013                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1014                 }
1015
1016                 wfProfileIn( __METHOD__ );
1017
1018                 $user = is_null( $user ) ? $wgUser : $user;
1019                 $status = Status::newGood( array() );
1020
1021                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1022                 $this->loadPageData();
1023
1024                 $flags = $this->checkFlags( $flags );
1025
1026                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1027                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1028                 {
1029                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1030
1031                         if ( $status->isOK() ) {
1032                                 $status->fatal( 'edit-hook-aborted' );
1033                         }
1034
1035                         wfProfileOut( __METHOD__ );
1036                         return $status;
1037                 }
1038
1039                 # Silently ignore EDIT_MINOR if not allowed
1040                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1041                 $bot = $flags & EDIT_FORCE_BOT;
1042
1043                 $oldtext = $this->getRawText(); // current revision
1044                 $oldsize = strlen( $oldtext );
1045                 $oldcountable = $this->isCountable();
1046
1047                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1048                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1049                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1050                 }
1051
1052                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1053                 $text = $editInfo->pst;
1054                 $newsize = strlen( $text );
1055
1056                 $dbw = wfGetDB( DB_MASTER );
1057                 $now = wfTimestampNow();
1058                 $this->mTimestamp = $now;
1059
1060                 if ( $flags & EDIT_UPDATE ) {
1061                         # Update article, but only if changed.
1062                         $status->value['new'] = false;
1063
1064                         # Make sure the revision is either completely inserted or not inserted at all
1065                         if ( !$wgDBtransactions ) {
1066                                 $userAbort = ignore_user_abort( true );
1067                         }
1068
1069                         $revision = new Revision( array(
1070                                 'page'       => $this->getId(),
1071                                 'comment'    => $summary,
1072                                 'minor_edit' => $isminor,
1073                                 'text'       => $text,
1074                                 'parent_id'  => $this->mLatest,
1075                                 'user'       => $user->getId(),
1076                                 'user_text'  => $user->getName(),
1077                                 'timestamp'  => $now
1078                         ) );
1079
1080                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1081
1082                         if ( $changed ) {
1083                                 if ( !$this->mLatest ) {
1084                                         # Article gone missing
1085                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1086                                         $status->fatal( 'edit-gone-missing' );
1087
1088                                         wfProfileOut( __METHOD__ );
1089                                         return $status;
1090                                 }
1091
1092                                 $dbw->begin();
1093                                 $revisionId = $revision->insertOn( $dbw );
1094
1095                                 # Update page
1096                                 #
1097                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1098                                 # during the course of this function. This makes sure that EditPage can detect
1099                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1100                                 # before this function is called. A previous function used a separate query, this
1101                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1102                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1103
1104                                 if ( !$ok ) {
1105                                         /* Belated edit conflict! Run away!! */
1106                                         $status->fatal( 'edit-conflict' );
1107
1108                                         # Delete the invalid revision if the DB is not transactional
1109                                         if ( !$wgDBtransactions ) {
1110                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1111                                         }
1112
1113                                         $revisionId = 0;
1114                                         $dbw->rollback();
1115                                 } else {
1116                                         global $wgUseRCPatrol;
1117                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1118                                         # Update recentchanges
1119                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1120                                                 # Mark as patrolled if the user can do so
1121                                                 $patrolled = $wgUseRCPatrol && !count(
1122                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1123                                                 # Add RC row to the DB
1124                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1125                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1126                                                         $revisionId, $patrolled
1127                                                 );
1128
1129                                                 # Log auto-patrolled edits
1130                                                 if ( $patrolled ) {
1131                                                         PatrolLog::record( $rc, true );
1132                                                 }
1133                                         }
1134                                         $user->incEditCount();
1135                                         $dbw->commit();
1136                                 }
1137                         }
1138
1139                         if ( !$wgDBtransactions ) {
1140                                 ignore_user_abort( $userAbort );
1141                         }
1142
1143                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1144                         if ( !$status->isOK() ) {
1145                                 wfProfileOut( __METHOD__ );
1146                                 return $status;
1147                         }
1148
1149                         # Update links tables, site stats, etc.
1150                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1151                                 'oldcountable' => $oldcountable ) );
1152
1153                         if ( !$changed ) {
1154                                 $status->warning( 'edit-no-change' );
1155                                 $revision = null;
1156                                 // Keep the same revision ID, but do some updates on it
1157                                 $revisionId = $this->getLatest();
1158                                 // Update page_touched, this is usually implicit in the page update
1159                                 // Other cache updates are done in onArticleEdit()
1160                                 $this->mTitle->invalidateCache();
1161                         }
1162                 } else {
1163                         # Create new article
1164                         $status->value['new'] = true;
1165
1166                         $dbw->begin();
1167
1168                         # Add the page record; stake our claim on this title!
1169                         # This will return false if the article already exists
1170                         $newid = $this->insertOn( $dbw );
1171
1172                         if ( $newid === false ) {
1173                                 $dbw->rollback();
1174                                 $status->fatal( 'edit-already-exists' );
1175
1176                                 wfProfileOut( __METHOD__ );
1177                                 return $status;
1178                         }
1179
1180                         # Save the revision text...
1181                         $revision = new Revision( array(
1182                                 'page'       => $newid,
1183                                 'comment'    => $summary,
1184                                 'minor_edit' => $isminor,
1185                                 'text'       => $text,
1186                                 'user'       => $user->getId(),
1187                                 'user_text'  => $user->getName(),
1188                                 'timestamp'  => $now
1189                         ) );
1190                         $revisionId = $revision->insertOn( $dbw );
1191
1192                         $this->mTitle->resetArticleID( $newid );
1193                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1194                         # @todo FIXME?
1195                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1196
1197                         # Update the page record with revision data
1198                         $this->updateRevisionOn( $dbw, $revision, 0 );
1199
1200                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1201
1202                         # Update recentchanges
1203                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1204                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1205
1206                                 # Mark as patrolled if the user can do so
1207                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1208                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1209                                 # Add RC row to the DB
1210                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1211                                         '', strlen( $text ), $revisionId, $patrolled );
1212
1213                                 # Log auto-patrolled edits
1214                                 if ( $patrolled ) {
1215                                         PatrolLog::record( $rc, true );
1216                                 }
1217                         }
1218                         $user->incEditCount();
1219                         $dbw->commit();
1220
1221                         # Update links, etc.
1222                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1223
1224                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1225                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1226                 }
1227
1228                 # Do updates right now unless deferral was requested
1229                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1230                         wfDoUpdates();
1231                 }
1232
1233                 // Return the new revision (or null) to the caller
1234                 $status->value['revision'] = $revision;
1235
1236                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1237                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1238
1239                 # Promote user to any groups they meet the criteria for
1240                 $user->addAutopromoteOnceGroups( 'onEdit' );
1241
1242                 wfProfileOut( __METHOD__ );
1243                 return $status;
1244         }
1245
1246         /**
1247          * Update the article's restriction field, and leave a log entry.
1248          *
1249          * @param $limit Array: set of restriction keys
1250          * @param $reason String
1251          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1252          * @param $expiry Array: per restriction type expiration
1253          * @param $user User The user updating the restrictions
1254          * @return bool true on success
1255          */
1256         public function updateRestrictions(
1257                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1258         ) {
1259                 global $wgUser, $wgContLang;
1260                 $user = is_null( $user ) ? $wgUser : $user;
1261
1262                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1263
1264                 $id = $this->mTitle->getArticleID();
1265
1266                 if ( $id <= 0 ) {
1267                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1268                         return false;
1269                 }
1270
1271                 if ( wfReadOnly() ) {
1272                         wfDebug( "updateRestrictions failed: read-only\n" );
1273                         return false;
1274                 }
1275
1276                 if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
1277                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1278                         return false;
1279                 }
1280
1281                 if ( !$cascade ) {
1282                         $cascade = false;
1283                 }
1284
1285                 // Take this opportunity to purge out expired restrictions
1286                 Title::purgeExpiredRestrictions();
1287
1288                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1289                 # we expect a single selection, but the schema allows otherwise.
1290                 $current = array();
1291                 $updated = self::flattenRestrictions( $limit );
1292                 $changed = false;
1293
1294                 foreach ( $restrictionTypes as $action ) {
1295                         if ( isset( $expiry[$action] ) ) {
1296                                 # Get current restrictions on $action
1297                                 $aLimits = $this->mTitle->getRestrictions( $action );
1298                                 $current[$action] = implode( '', $aLimits );
1299                                 # Are any actual restrictions being dealt with here?
1300                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1301
1302                                 # If something changed, we need to log it. Checking $aRChanged
1303                                 # assures that "unprotecting" a page that is not protected does
1304                                 # not log just because the expiry was "changed".
1305                                 if ( $aRChanged &&
1306                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1307                                 {
1308                                         $changed = true;
1309                                 }
1310                         }
1311                 }
1312
1313                 $current = self::flattenRestrictions( $current );
1314
1315                 $changed = ( $changed || $current != $updated );
1316                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1317                 $protect = ( $updated != '' );
1318
1319                 # If nothing's changed, do nothing
1320                 if ( $changed ) {
1321                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1322                                 $dbw = wfGetDB( DB_MASTER );
1323
1324                                 # Prepare a null revision to be added to the history
1325                                 $modified = $current != '' && $protect;
1326
1327                                 if ( $protect ) {
1328                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1329                                 } else {
1330                                         $comment_type = 'unprotectedarticle';
1331                                 }
1332
1333                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1334
1335                                 # Only restrictions with the 'protect' right can cascade...
1336                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1337                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1338
1339                                 # The schema allows multiple restrictions
1340                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1341                                         $cascade = false;
1342                                 }
1343
1344                                 $cascade_description = '';
1345
1346                                 if ( $cascade ) {
1347                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1348                                 }
1349
1350                                 if ( $reason ) {
1351                                         $comment .= ": $reason";
1352                                 }
1353
1354                                 $editComment = $comment;
1355                                 $encodedExpiry = array();
1356                                 $protect_description = '';
1357                                 foreach ( $limit as $action => $restrictions ) {
1358                                         if ( !isset( $expiry[$action] ) )
1359                                                 $expiry[$action] = $dbw->getInfinity();
1360
1361                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1362                                         if ( $restrictions != '' ) {
1363                                                 $protect_description .= "[$action=$restrictions] (";
1364                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1365                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1366                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1367                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1368                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1369                                                 } else {
1370                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1371                                                 }
1372
1373                                                 $protect_description .= ') ';
1374                                         }
1375                                 }
1376                                 $protect_description = trim( $protect_description );
1377
1378                                 if ( $protect_description && $protect ) {
1379                                         $editComment .= " ($protect_description)";
1380                                 }
1381
1382                                 if ( $cascade ) {
1383                                         $editComment .= "$cascade_description";
1384                                 }
1385
1386                                 # Update restrictions table
1387                                 foreach ( $limit as $action => $restrictions ) {
1388                                         if ( $restrictions != '' ) {
1389                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1390                                                         array( 'pr_page' => $id,
1391                                                                 'pr_type' => $action,
1392                                                                 'pr_level' => $restrictions,
1393                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1394                                                                 'pr_expiry' => $encodedExpiry[$action]
1395                                                         ),
1396                                                         __METHOD__
1397                                                 );
1398                                         } else {
1399                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1400                                                         'pr_type' => $action ), __METHOD__ );
1401                                         }
1402                                 }
1403
1404                                 # Insert a null revision
1405                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1406                                 $nullRevId = $nullRevision->insertOn( $dbw );
1407
1408                                 $latest = $this->getLatest();
1409                                 # Update page record
1410                                 $dbw->update( 'page',
1411                                         array( /* SET */
1412                                                 'page_touched' => $dbw->timestamp(),
1413                                                 'page_restrictions' => '',
1414                                                 'page_latest' => $nullRevId
1415                                         ), array( /* WHERE */
1416                                                 'page_id' => $id
1417                                         ), __METHOD__
1418                                 );
1419
1420                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1421                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1422
1423                                 # Update the protection log
1424                                 $log = new LogPage( 'protect' );
1425                                 if ( $protect ) {
1426                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1427                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1428                                 } else {
1429                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1430                                 }
1431                         } # End hook
1432                 } # End "changed" check
1433
1434                 return true;
1435         }
1436
1437         /**
1438          * Take an array of page restrictions and flatten it to a string
1439          * suitable for insertion into the page_restrictions field.
1440          * @param $limit Array
1441          * @return String
1442          */
1443         protected static function flattenRestrictions( $limit ) {
1444                 if ( !is_array( $limit ) ) {
1445                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1446                 }
1447
1448                 $bits = array();
1449                 ksort( $limit );
1450
1451                 foreach ( $limit as $action => $restrictions ) {
1452                         if ( $restrictions != '' ) {
1453                                 $bits[] = "$action=$restrictions";
1454                         }
1455                 }
1456
1457                 return implode( ':', $bits );
1458         }
1459
1460         /**
1461          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1462          */
1463         public function isBigDeletion() {
1464                 global $wgDeleteRevisionsLimit;
1465
1466                 if ( $wgDeleteRevisionsLimit ) {
1467                         $revCount = $this->estimateRevisionCount();
1468
1469                         return $revCount > $wgDeleteRevisionsLimit;
1470                 }
1471
1472                 return false;
1473         }
1474
1475         /**
1476          * @return int approximate revision count
1477          */
1478         public function estimateRevisionCount() {
1479                 $dbr = wfGetDB( DB_SLAVE );
1480
1481                 // For an exact count...
1482                 // return $dbr->selectField( 'revision', 'COUNT(*)',
1483                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
1484                 return $dbr->estimateRowCount( 'revision', '*',
1485                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1486         }
1487
1488         /**
1489          * Get the last N authors
1490          * @param $num Integer: number of revisions to get
1491          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1492          * @return array Array of authors, duplicates not removed
1493          */
1494         public function getLastNAuthors( $num, $revLatest = 0 ) {
1495                 wfProfileIn( __METHOD__ );
1496                 // First try the slave
1497                 // If that doesn't have the latest revision, try the master
1498                 $continue = 2;
1499                 $db = wfGetDB( DB_SLAVE );
1500
1501                 do {
1502                         $res = $db->select( array( 'page', 'revision' ),
1503                                 array( 'rev_id', 'rev_user_text' ),
1504                                 array(
1505                                         'page_namespace' => $this->mTitle->getNamespace(),
1506                                         'page_title' => $this->mTitle->getDBkey(),
1507                                         'rev_page = page_id'
1508                                 ), __METHOD__,
1509                                 array(
1510                                         'ORDER BY' => 'rev_timestamp DESC',
1511                                         'LIMIT' => $num
1512                                 )
1513                         );
1514
1515                         if ( !$res ) {
1516                                 wfProfileOut( __METHOD__ );
1517                                 return array();
1518                         }
1519
1520                         $row = $db->fetchObject( $res );
1521
1522                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1523                                 $db = wfGetDB( DB_MASTER );
1524                                 $continue--;
1525                         } else {
1526                                 $continue = 0;
1527                         }
1528                 } while ( $continue );
1529
1530                 $authors = array( $row->rev_user_text );
1531
1532                 foreach ( $res as $row ) {
1533                         $authors[] = $row->rev_user_text;
1534                 }
1535
1536                 wfProfileOut( __METHOD__ );
1537                 return $authors;
1538         }
1539
1540         /**
1541          * Back-end article deletion
1542          * Deletes the article with database consistency, writes logs, purges caches
1543          *
1544          * @param $reason string delete reason for deletion log
1545          * @param suppress bitfield
1546          *      Revision::DELETED_TEXT
1547          *      Revision::DELETED_COMMENT
1548          *      Revision::DELETED_USER
1549          *      Revision::DELETED_RESTRICTED
1550          * @param $id int article ID
1551          * @param $commit boolean defaults to true, triggers transaction end
1552          * @param &$errors Array of errors to append to
1553          * @param $user User The relevant user
1554          * @return boolean true if successful
1555          */
1556         public function doDeleteArticle(
1557                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1558         ) {
1559                 global $wgDeferredUpdateList, $wgUseTrackbacks, $wgUser;
1560                 $user = is_null( $user ) ? $wgUser : $user;
1561
1562                 wfDebug( __METHOD__ . "\n" );
1563
1564                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1565                         return false;
1566                 }
1567                 $dbw = wfGetDB( DB_MASTER );
1568                 $t = $this->mTitle->getDBkey();
1569                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1570
1571                 if ( $t === '' || $id == 0 ) {
1572                         return false;
1573                 }
1574
1575                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 );
1576                 array_push( $wgDeferredUpdateList, $u );
1577
1578                 // Bitfields to further suppress the content
1579                 if ( $suppress ) {
1580                         $bitfield = 0;
1581                         // This should be 15...
1582                         $bitfield |= Revision::DELETED_TEXT;
1583                         $bitfield |= Revision::DELETED_COMMENT;
1584                         $bitfield |= Revision::DELETED_USER;
1585                         $bitfield |= Revision::DELETED_RESTRICTED;
1586                 } else {
1587                         $bitfield = 'rev_deleted';
1588                 }
1589
1590                 $dbw->begin();
1591                 // For now, shunt the revision data into the archive table.
1592                 // Text is *not* removed from the text table; bulk storage
1593                 // is left intact to avoid breaking block-compression or
1594                 // immutable storage schemes.
1595                 //
1596                 // For backwards compatibility, note that some older archive
1597                 // table entries will have ar_text and ar_flags fields still.
1598                 //
1599                 // In the future, we may keep revisions and mark them with
1600                 // the rev_deleted field, which is reserved for this purpose.
1601                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1602                         array(
1603                                 'ar_namespace'  => 'page_namespace',
1604                                 'ar_title'      => 'page_title',
1605                                 'ar_comment'    => 'rev_comment',
1606                                 'ar_user'       => 'rev_user',
1607                                 'ar_user_text'  => 'rev_user_text',
1608                                 'ar_timestamp'  => 'rev_timestamp',
1609                                 'ar_minor_edit' => 'rev_minor_edit',
1610                                 'ar_rev_id'     => 'rev_id',
1611                                 'ar_text_id'    => 'rev_text_id',
1612                                 'ar_text'       => '\'\'', // Be explicit to appease
1613                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1614                                 'ar_len'        => 'rev_len',
1615                                 'ar_page_id'    => 'page_id',
1616                                 'ar_deleted'    => $bitfield
1617                         ), array(
1618                                 'page_id' => $id,
1619                                 'page_id = rev_page'
1620                         ), __METHOD__
1621                 );
1622
1623                 # Delete restrictions for it
1624                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1625
1626                 # Now that it's safely backed up, delete it
1627                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1628                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1629
1630                 if ( !$ok ) {
1631                         $dbw->rollback();
1632                         return false;
1633                 }
1634
1635                 # Fix category table counts
1636                 $cats = array();
1637                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1638
1639                 foreach ( $res as $row ) {
1640                         $cats [] = $row->cl_to;
1641                 }
1642
1643                 $this->updateCategoryCounts( array(), $cats );
1644
1645                 # If using cascading deletes, we can skip some explicit deletes
1646                 if ( !$dbw->cascadingDeletes() ) {
1647                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1648
1649                         if ( $wgUseTrackbacks )
1650                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1651
1652                         # Delete outgoing links
1653                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1654                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
1655                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
1656                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
1657                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
1658                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
1659                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ) );
1660                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
1661                 }
1662
1663                 # If using cleanup triggers, we can skip some manual deletes
1664                 if ( !$dbw->cleanupTriggers() ) {
1665                         # Clean up recentchanges entries...
1666                         $dbw->delete( 'recentchanges',
1667                                 array( 'rc_type != ' . RC_LOG,
1668                                         'rc_namespace' => $this->mTitle->getNamespace(),
1669                                         'rc_title' => $this->mTitle->getDBkey() ),
1670                                 __METHOD__ );
1671                         $dbw->delete( 'recentchanges',
1672                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1673                                 __METHOD__ );
1674                 }
1675
1676                 # Clear caches
1677                 self::onArticleDelete( $this->mTitle );
1678
1679                 # Clear the cached article id so the interface doesn't act like we exist
1680                 $this->mTitle->resetArticleID( 0 );
1681
1682                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1683                 $logtype = $suppress ? 'suppress' : 'delete';
1684                 $log = new LogPage( $logtype );
1685
1686                 # Make sure logging got through
1687                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
1688
1689                 if ( $commit ) {
1690                         $dbw->commit();
1691                 }
1692
1693                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1694                 return true;
1695         }
1696
1697         /**
1698          * Roll back the most recent consecutive set of edits to a page
1699          * from the same user; fails if there are no eligible edits to
1700          * roll back to, e.g. user is the sole contributor. This function
1701          * performs permissions checks on $user, then calls commitRollback()
1702          * to do the dirty work
1703          *
1704          * @param $fromP String: Name of the user whose edits to rollback.
1705          * @param $summary String: Custom summary. Set to default summary if empty.
1706          * @param $token String: Rollback token.
1707          * @param $bot Boolean: If true, mark all reverted edits as bot.
1708          *
1709          * @param $resultDetails Array: contains result-specific array of additional values
1710          *    'alreadyrolled' : 'current' (rev)
1711          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1712          *
1713          * @param $user User The user performing the rollback
1714          * @return array of errors, each error formatted as
1715          *   array(messagekey, param1, param2, ...).
1716          * On success, the array is empty.  This array can also be passed to
1717          * OutputPage::showPermissionsErrorPage().
1718          */
1719         public function doRollback(
1720                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1721         ) {
1722                 $resultDetails = null;
1723
1724                 # Check permissions
1725                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1726                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1727                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1728
1729                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1730                         $errors[] = array( 'sessionfailure' );
1731                 }
1732
1733                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1734                         $errors[] = array( 'actionthrottledtext' );
1735                 }
1736
1737                 # If there were errors, bail out now
1738                 if ( !empty( $errors ) ) {
1739                         return $errors;
1740                 }
1741
1742                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1743         }
1744
1745         /**
1746          * Backend implementation of doRollback(), please refer there for parameter
1747          * and return value documentation
1748          *
1749          * NOTE: This function does NOT check ANY permissions, it just commits the
1750          * rollback to the DB Therefore, you should only call this function direct-
1751          * ly if you want to use custom permissions checks. If you don't, use
1752          * doRollback() instead.
1753          * @param $fromP String: Name of the user whose edits to rollback.
1754          * @param $summary String: Custom summary. Set to default summary if empty.
1755          * @param $bot Boolean: If true, mark all reverted edits as bot.
1756          *
1757          * @param $resultDetails Array: contains result-specific array of additional values
1758          * @param $guser User The user performing the rollback
1759          */
1760         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1761                 global $wgUseRCPatrol, $wgContLang;
1762
1763                 $dbw = wfGetDB( DB_MASTER );
1764
1765                 if ( wfReadOnly() ) {
1766                         return array( array( 'readonlytext' ) );
1767                 }
1768
1769                 # Get the last editor
1770                 $current = Revision::newFromTitle( $this->mTitle );
1771                 if ( is_null( $current ) ) {
1772                         # Something wrong... no page?
1773                         return array( array( 'notanarticle' ) );
1774                 }
1775
1776                 $from = str_replace( '_', ' ', $fromP );
1777                 # User name given should match up with the top revision.
1778                 # If the user was deleted then $from should be empty.
1779                 if ( $from != $current->getUserText() ) {
1780                         $resultDetails = array( 'current' => $current );
1781                         return array( array( 'alreadyrolled',
1782                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1783                                 htmlspecialchars( $fromP ),
1784                                 htmlspecialchars( $current->getUserText() )
1785                         ) );
1786                 }
1787
1788                 # Get the last edit not by this guy...
1789                 # Note: these may not be public values
1790                 $user = intval( $current->getRawUser() );
1791                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1792                 $s = $dbw->selectRow( 'revision',
1793                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1794                         array( 'rev_page' => $current->getPage(),
1795                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1796                         ), __METHOD__,
1797                         array( 'USE INDEX' => 'page_timestamp',
1798                                 'ORDER BY' => 'rev_timestamp DESC' )
1799                         );
1800                 if ( $s === false ) {
1801                         # No one else ever edited this page
1802                         return array( array( 'cantrollback' ) );
1803                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1804                         # Only admins can see this text
1805                         return array( array( 'notvisiblerev' ) );
1806                 }
1807
1808                 $set = array();
1809                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1810                         # Mark all reverted edits as bot
1811                         $set['rc_bot'] = 1;
1812                 }
1813
1814                 if ( $wgUseRCPatrol ) {
1815                         # Mark all reverted edits as patrolled
1816                         $set['rc_patrolled'] = 1;
1817                 }
1818
1819                 if ( count( $set ) ) {
1820                         $dbw->update( 'recentchanges', $set,
1821                                 array( /* WHERE */
1822                                         'rc_cur_id' => $current->getPage(),
1823                                         'rc_user_text' => $current->getUserText(),
1824                                         "rc_timestamp > '{$s->rev_timestamp}'",
1825                                 ), __METHOD__
1826                         );
1827                 }
1828
1829                 # Generate the edit summary if necessary
1830                 $target = Revision::newFromId( $s->rev_id );
1831                 if ( empty( $summary ) ) {
1832                         if ( $from == '' ) { // no public user name
1833                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1834                         } else {
1835                                 $summary = wfMsgForContent( 'revertpage' );
1836                         }
1837                 }
1838
1839                 # Allow the custom summary to use the same args as the default message
1840                 $args = array(
1841                         $target->getUserText(), $from, $s->rev_id,
1842                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1843                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1844                 );
1845                 $summary = wfMsgReplaceArgs( $summary, $args );
1846
1847                 # Save
1848                 $flags = EDIT_UPDATE;
1849
1850                 if ( $guser->isAllowed( 'minoredit' ) ) {
1851                         $flags |= EDIT_MINOR;
1852                 }
1853
1854                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1855                         $flags |= EDIT_FORCE_BOT;
1856                 }
1857
1858                 # Actually store the edit
1859                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1860                 if ( !empty( $status->value['revision'] ) ) {
1861                         $revId = $status->value['revision']->getId();
1862                 } else {
1863                         $revId = false;
1864                 }
1865
1866                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1867
1868                 $resultDetails = array(
1869                         'summary' => $summary,
1870                         'current' => $current,
1871                         'target'  => $target,
1872                         'newid'   => $revId
1873                 );
1874
1875                 return array();
1876         }
1877
1878         /**
1879          * Do standard deferred updates after page view
1880          * @param $user User The relevant user
1881          */
1882         public function doViewUpdates( User $user ) {
1883                 global $wgDeferredUpdateList, $wgDisableCounters;
1884                 if ( wfReadOnly() ) {
1885                         return;
1886                 }
1887
1888                 # Don't update page view counters on views from bot users (bug 14044)
1889                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1890                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getId() );
1891                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
1892                 }
1893
1894                 # Update newtalk / watchlist notification status
1895                 $user->clearNotification( $this->mTitle );
1896         }
1897
1898         /**
1899          * Prepare text which is about to be saved.
1900          * Returns a stdclass with source, pst and output members
1901          */
1902         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1903                 global $wgParser, $wgUser;
1904                 $user = is_null( $user ) ? $wgUser : $user;
1905                 // @TODO fixme: check $user->getId() here???
1906                 if ( $this->mPreparedEdit
1907                         && $this->mPreparedEdit->newText == $text
1908                         && $this->mPreparedEdit->revid == $revid
1909                 ) {
1910                         // Already prepared
1911                         return $this->mPreparedEdit;
1912                 }
1913
1914                 $popts = ParserOptions::newFromUser( $user );
1915                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1916
1917                 $edit = (object)array();
1918                 $edit->revid = $revid;
1919                 $edit->newText = $text;
1920                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1921                 $edit->popts = $this->getParserOptions( true );
1922                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1923                 $edit->oldText = $this->getRawText();
1924
1925                 $this->mPreparedEdit = $edit;
1926
1927                 return $edit;
1928         }
1929
1930         /**
1931          * Do standard deferred updates after page edit.
1932          * Update links tables, site stats, search index and message cache.
1933          * Purges pages that include this page if the text was changed here.
1934          * Every 100th edit, prune the recent changes table.
1935          *
1936          * @private
1937          * @param $revision Revision object
1938          * @param $user User object that did the revision
1939          * @param $options Array of options, following indexes are used:
1940          * - changed: boolean, whether the revision changed the content (default true)
1941          * - created: boolean, whether the revision created the page (default false)
1942          * - oldcountable: boolean or null (default null):
1943          *   - boolean: whether the page was counted as an article before that
1944          *     revision, only used in changed is true and created is false
1945          *   - null: don't change the article count
1946          */
1947         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1948                 global $wgDeferredUpdateList, $wgEnableParserCache;
1949
1950                 wfProfileIn( __METHOD__ );
1951
1952                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1953                 $text = $revision->getText();
1954
1955                 # Parse the text
1956                 # Be careful not to double-PST: $text is usually already PST-ed once
1957                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1958                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1959                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1960                 } else {
1961                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1962                         $editInfo = $this->mPreparedEdit;
1963                 }
1964
1965                 # Save it to the parser cache
1966                 if ( $wgEnableParserCache ) {
1967                         $parserCache = ParserCache::singleton();
1968                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1969                 }
1970
1971                 # Update the links tables
1972                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1973                 $u->doUpdate();
1974
1975                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1976
1977                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1978                         if ( 0 == mt_rand( 0, 99 ) ) {
1979                                 // Flush old entries from the `recentchanges` table; we do this on
1980                                 // random requests so as to avoid an increase in writes for no good reason
1981                                 global $wgRCMaxAge;
1982
1983                                 $dbw = wfGetDB( DB_MASTER );
1984                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1985                                 $dbw->delete(
1986                                         'recentchanges',
1987                                         array( "rc_timestamp < '$cutoff'" ),
1988                                         __METHOD__
1989                                 );
1990                         }
1991                 }
1992
1993                 $id = $this->getId();
1994                 $title = $this->mTitle->getPrefixedDBkey();
1995                 $shortTitle = $this->mTitle->getDBkey();
1996
1997                 if ( 0 == $id ) {
1998                         wfProfileOut( __METHOD__ );
1999                         return;
2000                 }
2001
2002                 if ( !$options['changed'] ) {
2003                         $good = 0;
2004                         $total = 0;
2005                 } elseif ( $options['created'] ) {
2006                         $good = (int)$this->isCountable( $editInfo );
2007                         $total = 1;
2008                 } elseif ( $options['oldcountable'] !== null ) {
2009                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2010                         $total = 0;
2011                 } else {
2012                         $good = 0;
2013                         $total = 0;
2014                 }
2015
2016                 $wgDeferredUpdateList[] = new SiteStatsUpdate( 0, 1, $good, $total );
2017                 $wgDeferredUpdateList[] = new SearchUpdate( $id, $title, $text );
2018
2019                 # If this is another user's talk page, update newtalk.
2020                 # Don't do this if $options['changed'] = false (null-edits) nor if
2021                 # it's a minor edit and the user doesn't want notifications for those.
2022                 if ( $options['changed']
2023                         && $this->mTitle->getNamespace() == NS_USER_TALK
2024                         && $shortTitle != $user->getTitleKey()
2025                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2026                 ) {
2027                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2028                                 $other = User::newFromName( $shortTitle, false );
2029                                 if ( !$other ) {
2030                                         wfDebug( __METHOD__ . ": invalid username\n" );
2031                                 } elseif ( User::isIP( $shortTitle ) ) {
2032                                         // An anonymous user
2033                                         $other->setNewtalk( true );
2034                                 } elseif ( $other->isLoggedIn() ) {
2035                                         $other->setNewtalk( true );
2036                                 } else {
2037                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2038                                 }
2039                         }
2040                 }
2041
2042                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2043                         MessageCache::singleton()->replace( $shortTitle, $text );
2044                 }
2045
2046                 if( $options['created'] ) {
2047                         self::onArticleCreate( $this->mTitle );
2048                 } else {
2049                         self::onArticleEdit( $this->mTitle );
2050                 }
2051
2052                 wfProfileOut( __METHOD__ );
2053         }
2054
2055         /**
2056          * Perform article updates on a special page creation.
2057          *
2058          * @param $rev Revision object
2059          *
2060          * @todo This is a shitty interface function. Kill it and replace the
2061          * other shitty functions like doEditUpdates and such so it's not needed
2062          * anymore.
2063          * @deprecated since 1.19, use doEditUpdates()
2064          */
2065         public function createUpdates( $rev ) {
2066                 global $wgUser;
2067                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2068         }
2069
2070         /**
2071          * This function is called right before saving the wikitext,
2072          * so we can do things like signatures and links-in-context.
2073          *
2074          * @param $text String article contents
2075          * @param $user User object: user doing the edit
2076          * @param $popts ParserOptions object: parser options, default options for
2077          *               the user loaded if null given
2078          * @return string article contents with altered wikitext markup (signatures
2079          *      converted, {{subst:}}, templates, etc.)
2080          */
2081         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2082                 global $wgParser, $wgUser;
2083                 $user = is_null( $user ) ? $wgUser : $user;
2084
2085                 if ( $popts === null ) {
2086                         $popts = ParserOptions::newFromUser( $user );
2087                 }
2088
2089                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2090         }
2091
2092         /**
2093          * Loads page_touched and returns a value indicating if it should be used
2094          * @return boolean true if not a redirect
2095          */
2096         public function checkTouched() {
2097                 if ( !$this->mDataLoaded ) {
2098                         $this->loadPageData();
2099                 }
2100                 return !$this->mIsRedirect;
2101         }
2102
2103         /**
2104          * Get the page_touched field
2105          * @return string containing GMT timestamp
2106          */
2107         public function getTouched() {
2108                 if ( !$this->mDataLoaded ) {
2109                         $this->loadPageData();
2110                 }
2111                 return $this->mTouched;
2112         }
2113
2114         /**
2115          * Get the page_latest field
2116          * @return integer rev_id of current revision
2117          */
2118         public function getLatest() {
2119                 if ( !$this->mDataLoaded ) {
2120                         $this->loadPageData();
2121                 }
2122                 return (int)$this->mLatest;
2123         }
2124
2125         /**
2126          * Edit an article without doing all that other stuff
2127          * The article must already exist; link tables etc
2128          * are not updated, caches are not flushed.
2129          *
2130          * @param $text String: text submitted
2131          * @param $user User The relevant user
2132          * @param $comment String: comment submitted
2133          * @param $minor Boolean: whereas it's a minor modification
2134          */
2135         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2136                 wfProfileIn( __METHOD__ );
2137
2138                 $dbw = wfGetDB( DB_MASTER );
2139                 $revision = new Revision( array(
2140                         'page'       => $this->getId(),
2141                         'text'       => $text,
2142                         'comment'    => $comment,
2143                         'minor_edit' => $minor ? 1 : 0,
2144                 ) );
2145                 $revision->insertOn( $dbw );
2146                 $this->updateRevisionOn( $dbw, $revision );
2147
2148                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2149
2150                 wfProfileOut( __METHOD__ );
2151         }
2152
2153         /**
2154          * The onArticle*() functions are supposed to be a kind of hooks
2155          * which should be called whenever any of the specified actions
2156          * are done.
2157          *
2158          * This is a good place to put code to clear caches, for instance.
2159          *
2160          * This is called on page move and undelete, as well as edit
2161          *
2162          * @param $title Title object
2163          */
2164         public static function onArticleCreate( $title ) {
2165                 # Update existence markers on article/talk tabs...
2166                 if ( $title->isTalkPage() ) {
2167                         $other = $title->getSubjectPage();
2168                 } else {
2169                         $other = $title->getTalkPage();
2170                 }
2171
2172                 $other->invalidateCache();
2173                 $other->purgeSquid();
2174
2175                 $title->touchLinks();
2176                 $title->purgeSquid();
2177                 $title->deleteTitleProtection();
2178         }
2179
2180         /**
2181          * Clears caches when article is deleted
2182          *
2183          * @param $title Title
2184          */
2185         public static function onArticleDelete( $title ) {
2186                 # Update existence markers on article/talk tabs...
2187                 if ( $title->isTalkPage() ) {
2188                         $other = $title->getSubjectPage();
2189                 } else {
2190                         $other = $title->getTalkPage();
2191                 }
2192
2193                 $other->invalidateCache();
2194                 $other->purgeSquid();
2195
2196                 $title->touchLinks();
2197                 $title->purgeSquid();
2198
2199                 # File cache
2200                 HTMLFileCache::clearFileCache( $title );
2201
2202                 # Messages
2203                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2204                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2205                 }
2206
2207                 # Images
2208                 if ( $title->getNamespace() == NS_FILE ) {
2209                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2210                         $update->doUpdate();
2211                 }
2212
2213                 # User talk pages
2214                 if ( $title->getNamespace() == NS_USER_TALK ) {
2215                         $user = User::newFromName( $title->getText(), false );
2216                         $user->setNewtalk( false );
2217                 }
2218
2219                 # Image redirects
2220                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2221         }
2222
2223         /**
2224          * Purge caches on page update etc
2225          *
2226          * @param $title Title object
2227          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2228          */
2229         public static function onArticleEdit( $title ) {
2230                 global $wgDeferredUpdateList;
2231
2232                 // Invalidate caches of articles which include this page
2233                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
2234
2235                 // Invalidate the caches of all pages which redirect here
2236                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
2237
2238                 # Purge squid for this page only
2239                 $title->purgeSquid();
2240
2241                 # Clear file cache for this page only
2242                 HTMLFileCache::clearFileCache( $title );
2243         }
2244
2245         /**#@-*/
2246
2247         /**
2248          * Return a list of templates used by this article.
2249          * Uses the templatelinks table
2250          *
2251          * @return Array of Title objects
2252          */
2253         public function getUsedTemplates() {
2254                 $result = array();
2255                 $id = $this->mTitle->getArticleID();
2256
2257                 if ( $id == 0 ) {
2258                         return array();
2259                 }
2260
2261                 $dbr = wfGetDB( DB_SLAVE );
2262                 $res = $dbr->select( array( 'templatelinks' ),
2263                         array( 'tl_namespace', 'tl_title' ),
2264                         array( 'tl_from' => $id ),
2265                         __METHOD__ );
2266
2267                 if ( $res !== false ) {
2268                         foreach ( $res as $row ) {
2269                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2270                         }
2271                 }
2272
2273                 return $result;
2274         }
2275
2276         /**
2277          * Returns a list of hidden categories this page is a member of.
2278          * Uses the page_props and categorylinks tables.
2279          *
2280          * @return Array of Title objects
2281          */
2282         public function getHiddenCategories() {
2283                 $result = array();
2284                 $id = $this->mTitle->getArticleID();
2285
2286                 if ( $id == 0 ) {
2287                         return array();
2288                 }
2289
2290                 $dbr = wfGetDB( DB_SLAVE );
2291                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2292                         array( 'cl_to' ),
2293                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2294                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2295                         __METHOD__ );
2296
2297                 if ( $res !== false ) {
2298                         foreach ( $res as $row ) {
2299                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2300                         }
2301                 }
2302
2303                 return $result;
2304         }
2305
2306         /**
2307         * Return an applicable autosummary if one exists for the given edit.
2308         * @param $oldtext String: the previous text of the page.
2309         * @param $newtext String: The submitted text of the page.
2310         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2311         * @return string An appropriate autosummary, or an empty string.
2312         */
2313         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2314                 global $wgContLang;
2315
2316                 # Decide what kind of autosummary is needed.
2317
2318                 # Redirect autosummaries
2319                 $ot = Title::newFromRedirect( $oldtext );
2320                 $rt = Title::newFromRedirect( $newtext );
2321
2322                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2323                         $truncatedtext = $wgContLang->truncate(
2324                                 str_replace( "\n", ' ', $newtext ),
2325                                 max( 0, 250
2326                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2327                                         - strlen( $rt->getFullText() )
2328                                 ) );
2329                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2330                 }
2331
2332                 # New page autosummaries
2333                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2334                         # If they're making a new article, give its text, truncated, in the summary.
2335
2336                         $truncatedtext = $wgContLang->truncate(
2337                                 str_replace( "\n", ' ', $newtext ),
2338                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2339
2340                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2341                 }
2342
2343                 # Blanking autosummaries
2344                 if ( $oldtext != '' && $newtext == '' ) {
2345                         return wfMsgForContent( 'autosumm-blank' );
2346                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2347                         # Removing more than 90% of the article
2348
2349                         $truncatedtext = $wgContLang->truncate(
2350                                 $newtext,
2351                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2352
2353                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2354                 }
2355
2356                 # If we reach this point, there's no applicable autosummary for our case, so our
2357                 # autosummary is empty.
2358                 return '';
2359         }
2360
2361         /**
2362          * Get parser options suitable for rendering the primary article wikitext
2363          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
2364          * @return mixed ParserOptions object or boolean false
2365          */
2366         public function getParserOptions( $canonical = false ) {
2367                 global $wgUser, $wgLanguageCode;
2368
2369                 if ( !$this->mParserOptions || $canonical ) {
2370                         $user = !$canonical ? $wgUser : new User;
2371                         $parserOptions = new ParserOptions( $user );
2372                         $parserOptions->setTidy( true );
2373                         $parserOptions->enableLimitReport();
2374
2375                         if ( $canonical ) {
2376                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
2377                                 return $parserOptions;
2378                         }
2379                         $this->mParserOptions = $parserOptions;
2380                 }
2381                 // Clone to allow modifications of the return value without affecting cache
2382                 return clone $this->mParserOptions;
2383         }
2384
2385         /**
2386         * Get parser options suitable for rendering the primary article wikitext
2387         * @param User $user
2388         * @return ParserOptions
2389         */
2390         public function makeParserOptions( User $user ) {
2391                 $options = ParserOptions::newFromUser( $user );
2392                 $options->enableLimitReport(); // show inclusion/loop reports
2393                 $options->setTidy( true ); // fix bad HTML
2394                 return $options;
2395         }
2396
2397         /**
2398          * Update all the appropriate counts in the category table, given that
2399          * we've added the categories $added and deleted the categories $deleted.
2400          *
2401          * @param $added array   The names of categories that were added
2402          * @param $deleted array The names of categories that were deleted
2403          */
2404         public function updateCategoryCounts( $added, $deleted ) {
2405                 $ns = $this->mTitle->getNamespace();
2406                 $dbw = wfGetDB( DB_MASTER );
2407
2408                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2409                 # exist, we might legitimately not create it, but it's simpler to just
2410                 # create it and then give it a negative value, since the value is bogus
2411                 # anyway.
2412                 #
2413                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2414                 $insertCats = array_merge( $added, $deleted );
2415                 if ( !$insertCats ) {
2416                         # Okay, nothing to do
2417                         return;
2418                 }
2419
2420                 $insertRows = array();
2421
2422                 foreach ( $insertCats as $cat ) {
2423                         $insertRows[] = array(
2424                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2425                                 'cat_title' => $cat
2426                         );
2427                 }
2428                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2429
2430                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2431                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2432
2433                 if ( $ns == NS_CATEGORY ) {
2434                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2435                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2436                 } elseif ( $ns == NS_FILE ) {
2437                         $addFields[]    = 'cat_files = cat_files + 1';
2438                         $removeFields[] = 'cat_files = cat_files - 1';
2439                 }
2440
2441                 if ( $added ) {
2442                         $dbw->update(
2443                                 'category',
2444                                 $addFields,
2445                                 array( 'cat_title' => $added ),
2446                                 __METHOD__
2447                         );
2448                 }
2449
2450                 if ( $deleted ) {
2451                         $dbw->update(
2452                                 'category',
2453                                 $removeFields,
2454                                 array( 'cat_title' => $deleted ),
2455                                 __METHOD__
2456                         );
2457                 }
2458         }
2459
2460         /**
2461          * Updates cascading protections
2462          *
2463          * @param $parserOutput ParserOutput object for the current version
2464          **/
2465         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2466                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2467                         return;
2468                 }
2469
2470                 // templatelinks table may have become out of sync,
2471                 // especially if using variable-based transclusions.
2472                 // For paranoia, check if things have changed and if
2473                 // so apply updates to the database. This will ensure
2474                 // that cascaded protections apply as soon as the changes
2475                 // are visible.
2476
2477                 # Get templates from templatelinks
2478                 $id = $this->mTitle->getArticleID();
2479
2480                 $tlTemplates = array();
2481
2482                 $dbr = wfGetDB( DB_SLAVE );
2483                 $res = $dbr->select( array( 'templatelinks' ),
2484                         array( 'tl_namespace', 'tl_title' ),
2485                         array( 'tl_from' => $id ),
2486                         __METHOD__
2487                 );
2488
2489                 foreach ( $res as $row ) {
2490                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2491                 }
2492
2493                 # Get templates from parser output.
2494                 $poTemplates = array();
2495                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2496                         foreach ( $templates as $dbk => $id ) {
2497                                 $poTemplates["$ns:$dbk"] = true;
2498                         }
2499                 }
2500
2501                 # Get the diff
2502                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2503
2504                 if ( count( $templates_diff ) > 0 ) {
2505                         # Whee, link updates time.
2506                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2507                         $u->doUpdate();
2508                 }
2509         }
2510
2511         /*
2512         * @deprecated since 1.19
2513         */
2514         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2515                 global $wgUser;
2516                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2517         }
2518
2519         /*
2520         * @deprecated since 1.19
2521         */
2522         public function viewUpdates() {
2523                 global $wgUser;
2524                 return $this->doViewUpdates( $wgUser );
2525         }
2526
2527         /*
2528         * @deprecated since 1.19
2529         */
2530         public function useParserCache( $oldid ) {
2531                 global $wgUser;
2532                 return $this->isParserCacheUsed( $wgUser, $oldid );
2533         }
2534 }