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 One of the following:
 340          *              A DB query result object or...
 341          *              "fromdb" to get from a slave DB or...
 342          *              "fromdbmaster" to get from the master DB
 343          */
 344         public function loadPageData( $data = 'fromdb' ) {
 345                 if ( $data === 'fromdb' || $data === 'fromdbmaster' ) {
 346                         $db = ( $data == 'fromdbmaster' )
 347                                 ? wfGetDB( DB_MASTER )
 348                                 : wfGetDB( DB_SLAVE );
 349                         $data = $this->pageDataFromTitle( $db, $this->mTitle );
 350                 }
 351
 352                 $lc = LinkCache::singleton();
 353
 354                 if ( $data ) {
 355                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 356
 357                         $this->mTitle->loadFromRow( $data );
 358
 359                         # Old-fashioned restrictions
 360                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 361
 362                         $this->mCounter     = intval( $data->page_counter );
 363                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 364                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 365                         $this->mLatest      = intval( $data->page_latest );
 366                 } else {
 367                         $lc->addBadLinkObj( $this->mTitle );
 368
 369                         $this->mTitle->loadFromRow( false );
 370                 }
 371
 372                 $this->mDataLoaded = true;
 373         }
 374
 375         /**
 376          * @return int Page ID
 377          */
 378         public function getId() {
 379                 return $this->mTitle->getArticleID();
 380         }
 381
 382         /**
 383          * @return bool Whether or not the page exists in the database
 384          */
 385         public function exists() {
 386                 return $this->getId() > 0;
 387         }
 388
 389         /**
 390          * Check if this page is something we're going to be showing
 391          * some sort of sensible content for. If we return false, page
 392          * views (plain action=view) will return an HTTP 404 response,
 393          * so spiders and robots can know they're following a bad link.
 394          *
 395          * @return bool
 396          */
 397         public function hasViewableContent() {
 398                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 399         }
 400
 401         /**
 402          * @return int The view count for the page
 403          */
 404         public function getCount() {
 405                 if ( -1 == $this->mCounter ) {
 406                         $id = $this->getId();
 407
 408                         if ( $id == 0 ) {
 409                                 $this->mCounter = 0;
 410                         } else {
 411                                 $dbr = wfGetDB( DB_SLAVE );
 412                                 $this->mCounter = $dbr->selectField( 'page',
 413                                         'page_counter',
 414                                         array( 'page_id' => $id ),
 415                                         __METHOD__
 416                                 );
 417                         }
 418                 }
 419
 420                 return $this->mCounter;
 421         }
 422
 423         /**
 424          * Determine whether a page would be suitable for being counted as an
 425          * article in the site_stats table based on the title & its content
 426          *
 427          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 428          *        if false, the current database state will be used
 429          * @return Boolean
 430          */
 431         public function isCountable( $editInfo = false ) {
 432                 global $wgArticleCountMethod;
 433
 434                 if ( !$this->mTitle->isContentPage() ) {
 435                         return false;
 436                 }
 437
 438                 $text = $editInfo ? $editInfo->pst : false;
 439
 440                 if ( $this->isRedirect( $text ) ) {
 441                         return false;
 442                 }
 443
 444                 switch ( $wgArticleCountMethod ) {
 445                 case 'any':
 446                         return true;
 447                 case 'comma':
 448                         if ( $text === false ) {
 449                                 $text = $this->getRawText();
 450                         }
 451                         return strpos( $text,  ',' ) !== false;
 452                 case 'link':
 453                         if ( $editInfo ) {
 454                                 // ParserOutput::getLinks() is a 2D array of page links, so
 455                                 // to be really correct we would need to recurse in the array
 456                                 // but the main array should only have items in it if there are
 457                                 // links.
 458                                 return (bool)count( $editInfo->output->getLinks() );
 459                         } else {
 460                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 461                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 462                         }
 463                 }
 464         }
 465
 466         /**
 467          * Tests if the article text represents a redirect
 468          *
 469          * @param $text mixed string containing article contents, or boolean
 470          * @return bool
 471          */
 472         public function isRedirect( $text = false ) {
 473                 if ( $text === false ) {
 474                         if ( !$this->mDataLoaded ) {
 475                                 $this->loadPageData();
 476                         }
 477
 478                         return (bool)$this->mIsRedirect;
 479                 } else {
 480                         return Title::newFromRedirect( $text ) !== null;
 481                 }
 482         }
 483
 484         /**
 485          * Loads everything except the text
 486          * This isn't necessary for all uses, so it's only done if needed.
 487          */
 488         protected function loadLastEdit() {
 489                 if ( $this->mLastRevision !== null ) {
 490                         return; // already loaded
 491                 }
 492
 493                 $latest = $this->getLatest();
 494                 if ( !$latest ) {
 495                         return; // page doesn't exist or is missing page_latest info
 496                 }
 497
 498                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 499                 if ( $revision ) { // sanity
 500                         $this->setLastEdit( $revision );
 501                 }
 502         }
 503
 504         /**
 505          * Set the latest revision
 506          */
 507         protected function setLastEdit( Revision $revision ) {
 508                 $this->mLastRevision = $revision;
 509                 $this->mTimestamp = $revision->getTimestamp();
 510         }
 511
 512         /**
 513          * Get the latest revision
 514          * @return Revision|null
 515          */
 516         public function getRevision() {
 517                 $this->loadLastEdit();
 518                 if ( $this->mLastRevision ) {
 519                         return $this->mLastRevision;
 520                 }
 521                 return null;
 522         }
 523
 524         /**
 525          * Get the text of the current revision. No side-effects...
 526          *
 527          * @param $audience Integer: one of:
 528          *      Revision::FOR_PUBLIC       to be displayed to all users
 529          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 530          *      Revision::RAW              get the text regardless of permissions
 531          * @return String|false The text of the current revision
 532          */
 533         public function getText( $audience = Revision::FOR_PUBLIC ) {
 534                 $this->loadLastEdit();
 535                 if ( $this->mLastRevision ) {
 536                         return $this->mLastRevision->getText( $audience );
 537                 }
 538                 return false;
 539         }
 540
 541         /**
 542          * Get the text of the current revision. No side-effects...
 543          *
 544          * @return String|false The text of the current revision
 545          */
 546         public function getRawText() {
 547                 $this->loadLastEdit();
 548                 if ( $this->mLastRevision ) {
 549                         return $this->mLastRevision->getRawText();
 550                 }
 551                 return false;
 552         }
 553
 554         /**
 555          * @return string MW timestamp of last article revision
 556          */
 557         public function getTimestamp() {
 558                 // Check if the field has been filled by ParserCache::get()
 559                 if ( !$this->mTimestamp ) {
 560                         $this->loadLastEdit();
 561                 }
 562                 return wfTimestamp( TS_MW, $this->mTimestamp );
 563         }
 564
 565         /**
 566          * Set the page timestamp (use only to avoid DB queries)
 567          * @param $ts string MW timestamp of last article revision
 568          * @return void
 569          */
 570         public function setTimestamp( $ts ) {
 571                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 572         }
 573
 574         /**
 575          * @param $audience Integer: one of:
 576          *      Revision::FOR_PUBLIC       to be displayed to all users
 577          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 578          *      Revision::RAW              get the text regardless of permissions
 579          * @return int user ID for the user that made the last article revision
 580          */
 581         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 582                 $this->loadLastEdit();
 583                 if ( $this->mLastRevision ) {
 584                         return $this->mLastRevision->getUser( $audience );
 585                 } else {
 586                         return -1;
 587                 }
 588         }
 589
 590         /**
 591          * @param $audience Integer: one of:
 592          *      Revision::FOR_PUBLIC       to be displayed to all users
 593          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 594          *      Revision::RAW              get the text regardless of permissions
 595          * @return string username of the user that made the last article revision
 596          */
 597         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 598                 $this->loadLastEdit();
 599                 if ( $this->mLastRevision ) {
 600                         return $this->mLastRevision->getUserText( $audience );
 601                 } else {
 602                         return '';
 603                 }
 604         }
 605
 606         /**
 607          * @param $audience Integer: one of:
 608          *      Revision::FOR_PUBLIC       to be displayed to all users
 609          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 610          *      Revision::RAW              get the text regardless of permissions
 611          * @return string Comment stored for the last article revision
 612          */
 613         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 614                 $this->loadLastEdit();
 615                 if ( $this->mLastRevision ) {
 616                         return $this->mLastRevision->getComment( $audience );
 617                 } else {
 618                         return '';
 619                 }
 620         }
 621
 622         /**
 623          * Returns true if last revision was marked as "minor edit"
 624          *
 625          * @return boolean Minor edit indicator for the last article revision.
 626          */
 627         public function getMinorEdit() {
 628                 $this->loadLastEdit();
 629                 if ( $this->mLastRevision ) {
 630                         return $this->mLastRevision->isMinor();
 631                 } else {
 632                         return false;
 633                 }
 634         }
 635
 636         /**
 637          * Get a list of users who have edited this article, not including the user who made
 638          * the most recent revision, which you can get from $article->getUser() if you want it
 639          * @return UserArrayFromResult
 640          */
 641         public function getContributors() {
 642                 # @todo FIXME: This is expensive; cache this info somewhere.
 643
 644                 $dbr = wfGetDB( DB_SLAVE );
 645
 646                 if ( $dbr->implicitGroupby() ) {
 647                         $realNameField = 'user_real_name';
 648                 } else {
 649                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 650                 }
 651
 652                 $tables = array( 'revision', 'user' );
 653
 654                 $fields = array(
 655                         'rev_user as user_id',
 656                         'rev_user_text AS user_name',
 657                         $realNameField,
 658                         'MAX(rev_timestamp) AS timestamp',
 659                 );
 660
 661                 $conds = array( 'rev_page' => $this->getId() );
 662
 663                 // The user who made the top revision gets credited as "this page was last edited by
 664                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 665                 $user = $this->getUser();
 666                 if ( $user ) {
 667                         $conds[] = "rev_user != $user";
 668                 } else {
 669                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 670                 }
 671
 672                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 673
 674                 $jconds = array(
 675                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 676                 );
 677
 678                 $options = array(
 679                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 680                         'ORDER BY' => 'timestamp DESC',
 681                 );
 682
 683                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 684                 return new UserArrayFromResult( $res );
 685         }
 686
 687         /**
 688          * Should the parser cache be used?
 689          *
 690          * @param $user User The relevant user
 691          * @return boolean
 692          */
 693         public function isParserCacheUsed( User $user, $oldid ) {
 694                 global $wgEnableParserCache;
 695
 696                 return $wgEnableParserCache
 697                         && $user->getStubThreshold() == 0
 698                         && $this->exists()
 699                         && empty( $oldid )
 700                         && !$this->mTitle->isCssOrJsPage()
 701                         && !$this->mTitle->isCssJsSubpage();
 702         }
 703
 704         /**
 705          * Perform the actions of a page purging
 706          */
 707         public function doPurge() {
 708                 global $wgUseSquid;
 709
 710                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 711                         return false;
 712                 }
 713
 714                 // Invalidate the cache
 715                 $this->mTitle->invalidateCache();
 716                 $this->clear();
 717
 718                 if ( $wgUseSquid ) {
 719                         // Commit the transaction before the purge is sent
 720                         $dbw = wfGetDB( DB_MASTER );
 721                         $dbw->commit();
 722
 723                         // Send purge
 724                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 725                         $update->doUpdate();
 726                 }
 727
 728                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 729                         if ( $this->getId() == 0 ) {
 730                                 $text = false;
 731                         } else {
 732                                 $text = $this->getRawText();
 733                         }
 734
 735                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 736                 }
 737         }
 738
 739         /**
 740          * Insert a new empty page record for this article.
 741          * This *must* be followed up by creating a revision
 742          * and running $this->updateRevisionOn( ... );
 743          * or else the record will be left in a funky state.
 744          * Best if all done inside a transaction.
 745          *
 746          * @param $dbw DatabaseBase
 747          * @return int The newly created page_id key, or false if the title already existed
 748          * @private
 749          */
 750         public function insertOn( $dbw ) {
 751                 wfProfileIn( __METHOD__ );
 752
 753                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 754                 $dbw->insert( 'page', array(
 755                         'page_id'           => $page_id,
 756                         'page_namespace'    => $this->mTitle->getNamespace(),
 757                         'page_title'        => $this->mTitle->getDBkey(),
 758                         'page_counter'      => 0,
 759                         'page_restrictions' => '',
 760                         'page_is_redirect'  => 0, # Will set this shortly...
 761                         'page_is_new'       => 1,
 762                         'page_random'       => wfRandom(),
 763                         'page_touched'      => $dbw->timestamp(),
 764                         'page_latest'       => 0, # Fill this in shortly...
 765                         'page_len'          => 0, # Fill this in shortly...
 766                 ), __METHOD__, 'IGNORE' );
 767
 768                 $affected = $dbw->affectedRows();
 769
 770                 if ( $affected ) {
 771                         $newid = $dbw->insertId();
 772                         $this->mTitle->resetArticleID( $newid );
 773                 }
 774                 wfProfileOut( __METHOD__ );
 775
 776                 return $affected ? $newid : false;
 777         }
 778
 779         /**
 780          * Update the page record to point to a newly saved revision.
 781          *
 782          * @param $dbw DatabaseBase: object
 783          * @param $revision Revision: For ID number, and text used to set
 784                                                 length and redirect status fields
 785          * @param $lastRevision Integer: if given, will not overwrite the page field
 786          *                      when different from the currently set value.
 787          *                      Giving 0 indicates the new page flag should be set
 788          *                      on.
 789          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 790          *                           removing rows in redirect table.
 791          * @return bool true on success, false on failure
 792          * @private
 793          */
 794         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 795                 wfProfileIn( __METHOD__ );
 796
 797                 $text = $revision->getText();
 798                 $rt = Title::newFromRedirectRecurse( $text );
 799
 800                 $conditions = array( 'page_id' => $this->getId() );
 801
 802                 if ( !is_null( $lastRevision ) ) {
 803                         # An extra check against threads stepping on each other
 804                         $conditions['page_latest'] = $lastRevision;
 805                 }
 806
 807                 $dbw->update( 'page',
 808                         array( /* SET */
 809                                 'page_latest'      => $revision->getId(),
 810                                 'page_touched'     => $dbw->timestamp(),
 811                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 812                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 813                                 'page_len'         => strlen( $text ),
 814                         ),
 815                         $conditions,
 816                         __METHOD__ );
 817
 818                 $result = $dbw->affectedRows() != 0;
 819                 if ( $result ) {
 820                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 821                 }
 822
 823                 wfProfileOut( __METHOD__ );
 824                 return $result;
 825         }
 826
 827         /**
 828          * Add row to the redirect table if this is a redirect, remove otherwise.
 829          *
 830          * @param $dbw DatabaseBase
 831          * @param $redirectTitle Title object pointing to the redirect target,
 832          *                       or NULL if this is not a redirect
 833          * @param $lastRevIsRedirect If given, will optimize adding and
 834          *                           removing rows in redirect table.
 835          * @return bool true on success, false on failure
 836          * @private
 837          */
 838         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 839                 // Always update redirects (target link might have changed)
 840                 // Update/Insert if we don't know if the last revision was a redirect or not
 841                 // Delete if changing from redirect to non-redirect
 842                 $isRedirect = !is_null( $redirectTitle );
 843
 844                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 845                         return true;
 846                 }
 847
 848                 wfProfileIn( __METHOD__ );
 849                 if ( $isRedirect ) {
 850                         $this->insertRedirectEntry( $redirectTitle );
 851                 } else {
 852                         // This is not a redirect, remove row from redirect table
 853                         $where = array( 'rd_from' => $this->getId() );
 854                         $dbw->delete( 'redirect', $where, __METHOD__ );
 855                 }
 856
 857                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 858                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 859                 }
 860                 wfProfileOut( __METHOD__ );
 861
 862                 return ( $dbw->affectedRows() != 0 );
 863         }
 864
 865         /**
 866          * If the given revision is newer than the currently set page_latest,
 867          * update the page record. Otherwise, do nothing.
 868          *
 869          * @param $dbw Database object
 870          * @param $revision Revision object
 871          * @return mixed
 872          */
 873         public function updateIfNewerOn( $dbw, $revision ) {
 874                 wfProfileIn( __METHOD__ );
 875
 876                 $row = $dbw->selectRow(
 877                         array( 'revision', 'page' ),
 878                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 879                         array(
 880                                 'page_id' => $this->getId(),
 881                                 'page_latest=rev_id' ),
 882                         __METHOD__ );
 883
 884                 if ( $row ) {
 885                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 886                                 wfProfileOut( __METHOD__ );
 887                                 return false;
 888                         }
 889                         $prev = $row->rev_id;
 890                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 891                 } else {
 892                         # No or missing previous revision; mark the page as new
 893                         $prev = 0;
 894                         $lastRevIsRedirect = null;
 895                 }
 896
 897                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 898
 899                 wfProfileOut( __METHOD__ );
 900                 return $ret;
 901         }
 902
 903         /**
 904          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 905          * @param $text String: new text of the section
 906          * @param $summary String: new section's subject, only if $section is 'new'
 907          * @param $edittime String: revision timestamp or null to use the current revision
 908          * @return string Complete article text, or null if error
 909          */
 910         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 911                 wfProfileIn( __METHOD__ );
 912
 913                 if ( strval( $section ) == '' ) {
 914                         // Whole-page edit; let the whole text through
 915                 } else {
 916                         if ( is_null( $edittime ) ) {
 917                                 $rev = Revision::newFromTitle( $this->mTitle );
 918                         } else {
 919                                 $dbw = wfGetDB( DB_MASTER );
 920                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 921                         }
 922
 923                         if ( !$rev ) {
 924                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 925                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 926                                 wfProfileOut( __METHOD__ );
 927                                 return null;
 928                         }
 929
 930                         $oldtext = $rev->getText();
 931
 932                         if ( $section == 'new' ) {
 933                                 # Inserting a new section
 934                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 935                                 $text = strlen( trim( $oldtext ) ) > 0
 936                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 937                                                 : "{$subject}{$text}";
 938                         } else {
 939                                 # Replacing an existing section; roll out the big guns
 940                                 global $wgParser;
 941
 942                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 943                         }
 944                 }
 945
 946                 wfProfileOut( __METHOD__ );
 947                 return $text;
 948         }
 949
 950         /**
 951          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 952          * @param $flags Int
 953          * @return Int updated $flags
 954          */
 955         function checkFlags( $flags ) {
 956                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
 957                         if ( $this->mTitle->getArticleID() ) {
 958                                 $flags |= EDIT_UPDATE;
 959                         } else {
 960                                 $flags |= EDIT_NEW;
 961                         }
 962                 }
 963
 964                 return $flags;
 965         }
 966
 967         /**
 968          * Change an existing article or create a new article. Updates RC and all necessary caches,
 969          * optionally via the deferred update array.
 970          *
 971          * @param $text String: new text
 972          * @param $summary String: edit summary
 973          * @param $flags Integer bitfield:
 974          *      EDIT_NEW
 975          *          Article is known or assumed to be non-existent, create a new one
 976          *      EDIT_UPDATE
 977          *          Article is known or assumed to be pre-existing, update it
 978          *      EDIT_MINOR
 979          *          Mark this edit minor, if the user is allowed to do so
 980          *      EDIT_SUPPRESS_RC
 981          *          Do not log the change in recentchanges
 982          *      EDIT_FORCE_BOT
 983          *          Mark the edit a "bot" edit regardless of user rights
 984          *      EDIT_DEFER_UPDATES
 985          *          Defer some of the updates until the end of index.php
 986          *      EDIT_AUTOSUMMARY
 987          *          Fill in blank summaries with generated text where possible
 988          *
 989          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
 990          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
 991          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
 992          * edit-already-exists error will be returned. These two conditions are also possible with
 993          * auto-detection due to MediaWiki's performance-optimised locking strategy.
 994          *
 995          * @param $baseRevId the revision ID this edit was based off, if any
 996          * @param $user User the user doing the edit
 997          *
 998          * @return Status object. Possible errors:
 999          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1000          *     edit-gone-missing:       In update mode, but the article didn't exist
1001          *     edit-conflict:           In update mode, the article changed unexpectedly
1002          *     edit-no-change:          Warning that the text was the same as before
1003          *     edit-already-exists:     In creation mode, but the article already exists
1004          *
1005          *  Extensions may define additional errors.
1006          *
1007          *  $return->value will contain an associative array with members as follows:
1008          *     new:                     Boolean indicating if the function attempted to create a new article
1009          *     revision:                The revision object for the inserted revision, or null
1010          *
1011          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1012          */
1013         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1014                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1015
1016                 # Low-level sanity check
1017                 if ( $this->mTitle->getText() === '' ) {
1018                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1019                 }
1020
1021                 wfProfileIn( __METHOD__ );
1022
1023                 $user = is_null( $user ) ? $wgUser : $user;
1024                 $status = Status::newGood( array() );
1025
1026                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1027                 $this->loadPageData();
1028
1029                 $flags = $this->checkFlags( $flags );
1030
1031                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1032                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1033                 {
1034                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1035
1036                         if ( $status->isOK() ) {
1037                                 $status->fatal( 'edit-hook-aborted' );
1038                         }
1039
1040                         wfProfileOut( __METHOD__ );
1041                         return $status;
1042                 }
1043
1044                 # Silently ignore EDIT_MINOR if not allowed
1045                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1046                 $bot = $flags & EDIT_FORCE_BOT;
1047
1048                 $oldtext = $this->getRawText(); // current revision
1049                 $oldsize = strlen( $oldtext );
1050                 $oldcountable = $this->isCountable();
1051
1052                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1053                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1054                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1055                 }
1056
1057                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1058                 $text = $editInfo->pst;
1059                 $newsize = strlen( $text );
1060
1061                 $dbw = wfGetDB( DB_MASTER );
1062                 $now = wfTimestampNow();
1063                 $this->mTimestamp = $now;
1064
1065                 if ( $flags & EDIT_UPDATE ) {
1066                         # Update article, but only if changed.
1067                         $status->value['new'] = false;
1068
1069                         # Make sure the revision is either completely inserted or not inserted at all
1070                         if ( !$wgDBtransactions ) {
1071                                 $userAbort = ignore_user_abort( true );
1072                         }
1073
1074                         $revision = new Revision( array(
1075                                 'page'       => $this->getId(),
1076                                 'comment'    => $summary,
1077                                 'minor_edit' => $isminor,
1078                                 'text'       => $text,
1079                                 'parent_id'  => $this->mLatest,
1080                                 'user'       => $user->getId(),
1081                                 'user_text'  => $user->getName(),
1082                                 'timestamp'  => $now
1083                         ) );
1084
1085                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1086
1087                         if ( $changed ) {
1088                                 if ( !$this->mLatest ) {
1089                                         # Article gone missing
1090                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1091                                         $status->fatal( 'edit-gone-missing' );
1092
1093                                         wfProfileOut( __METHOD__ );
1094                                         return $status;
1095                                 }
1096
1097                                 $dbw->begin();
1098                                 $revisionId = $revision->insertOn( $dbw );
1099
1100                                 # Update page
1101                                 #
1102                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1103                                 # during the course of this function. This makes sure that EditPage can detect
1104                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1105                                 # before this function is called. A previous function used a separate query, this
1106                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1107                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1108
1109                                 if ( !$ok ) {
1110                                         /* Belated edit conflict! Run away!! */
1111                                         $status->fatal( 'edit-conflict' );
1112
1113                                         # Delete the invalid revision if the DB is not transactional
1114                                         if ( !$wgDBtransactions ) {
1115                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1116                                         }
1117
1118                                         $revisionId = 0;
1119                                         $dbw->rollback();
1120                                 } else {
1121                                         global $wgUseRCPatrol;
1122                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1123                                         # Update recentchanges
1124                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1125                                                 # Mark as patrolled if the user can do so
1126                                                 $patrolled = $wgUseRCPatrol && !count(
1127                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1128                                                 # Add RC row to the DB
1129                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1130                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1131                                                         $revisionId, $patrolled
1132                                                 );
1133
1134                                                 # Log auto-patrolled edits
1135                                                 if ( $patrolled ) {
1136                                                         PatrolLog::record( $rc, true );
1137                                                 }
1138                                         }
1139                                         $user->incEditCount();
1140                                         $dbw->commit();
1141                                 }
1142                         }
1143
1144                         if ( !$wgDBtransactions ) {
1145                                 ignore_user_abort( $userAbort );
1146                         }
1147
1148                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1149                         if ( !$status->isOK() ) {
1150                                 wfProfileOut( __METHOD__ );
1151                                 return $status;
1152                         }
1153
1154                         # Update links tables, site stats, etc.
1155                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1156                                 'oldcountable' => $oldcountable ) );
1157
1158                         if ( !$changed ) {
1159                                 $status->warning( 'edit-no-change' );
1160                                 $revision = null;
1161                                 // Keep the same revision ID, but do some updates on it
1162                                 $revisionId = $this->getLatest();
1163                                 // Update page_touched, this is usually implicit in the page update
1164                                 // Other cache updates are done in onArticleEdit()
1165                                 $this->mTitle->invalidateCache();
1166                         }
1167                 } else {
1168                         # Create new article
1169                         $status->value['new'] = true;
1170
1171                         $dbw->begin();
1172
1173                         # Add the page record; stake our claim on this title!
1174                         # This will return false if the article already exists
1175                         $newid = $this->insertOn( $dbw );
1176
1177                         if ( $newid === false ) {
1178                                 $dbw->rollback();
1179                                 $status->fatal( 'edit-already-exists' );
1180
1181                                 wfProfileOut( __METHOD__ );
1182                                 return $status;
1183                         }
1184
1185                         # Save the revision text...
1186                         $revision = new Revision( array(
1187                                 'page'       => $newid,
1188                                 'comment'    => $summary,
1189                                 'minor_edit' => $isminor,
1190                                 'text'       => $text,
1191                                 'user'       => $user->getId(),
1192                                 'user_text'  => $user->getName(),
1193                                 'timestamp'  => $now
1194                         ) );
1195                         $revisionId = $revision->insertOn( $dbw );
1196
1197                         $this->mTitle->resetArticleID( $newid );
1198                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1199                         # @todo FIXME?
1200                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1201
1202                         # Update the page record with revision data
1203                         $this->updateRevisionOn( $dbw, $revision, 0 );
1204
1205                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1206
1207                         # Update recentchanges
1208                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1209                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1210
1211                                 # Mark as patrolled if the user can do so
1212                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1213                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1214                                 # Add RC row to the DB
1215                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1216                                         '', strlen( $text ), $revisionId, $patrolled );
1217
1218                                 # Log auto-patrolled edits
1219                                 if ( $patrolled ) {
1220                                         PatrolLog::record( $rc, true );
1221                                 }
1222                         }
1223                         $user->incEditCount();
1224                         $dbw->commit();
1225
1226                         # Update links, etc.
1227                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1228
1229                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1230                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1231                 }
1232
1233                 # Do updates right now unless deferral was requested
1234                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1235                         wfDoUpdates();
1236                 }
1237
1238                 // Return the new revision (or null) to the caller
1239                 $status->value['revision'] = $revision;
1240
1241                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1242                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1243
1244                 # Promote user to any groups they meet the criteria for
1245                 $user->addAutopromoteOnceGroups( 'onEdit' );
1246
1247                 wfProfileOut( __METHOD__ );
1248                 return $status;
1249         }
1250
1251         /**
1252          * Update the article's restriction field, and leave a log entry.
1253          *
1254          * @param $limit Array: set of restriction keys
1255          * @param $reason String
1256          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1257          * @param $expiry Array: per restriction type expiration
1258          * @param $user User The user updating the restrictions
1259          * @return bool true on success
1260          */
1261         public function updateRestrictions(
1262                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1263         ) {
1264                 global $wgUser, $wgContLang;
1265                 $user = is_null( $user ) ? $wgUser : $user;
1266
1267                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1268
1269                 $id = $this->mTitle->getArticleID();
1270
1271                 if ( $id <= 0 ) {
1272                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1273                         return false;
1274                 }
1275
1276                 if ( wfReadOnly() ) {
1277                         wfDebug( "updateRestrictions failed: read-only\n" );
1278                         return false;
1279                 }
1280
1281                 if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
1282                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1283                         return false;
1284                 }
1285
1286                 if ( !$cascade ) {
1287                         $cascade = false;
1288                 }
1289
1290                 // Take this opportunity to purge out expired restrictions
1291                 Title::purgeExpiredRestrictions();
1292
1293                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1294                 # we expect a single selection, but the schema allows otherwise.
1295                 $current = array();
1296                 $updated = self::flattenRestrictions( $limit );
1297                 $changed = false;
1298
1299                 foreach ( $restrictionTypes as $action ) {
1300                         if ( isset( $expiry[$action] ) ) {
1301                                 # Get current restrictions on $action
1302                                 $aLimits = $this->mTitle->getRestrictions( $action );
1303                                 $current[$action] = implode( '', $aLimits );
1304                                 # Are any actual restrictions being dealt with here?
1305                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1306
1307                                 # If something changed, we need to log it. Checking $aRChanged
1308                                 # assures that "unprotecting" a page that is not protected does
1309                                 # not log just because the expiry was "changed".
1310                                 if ( $aRChanged &&
1311                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1312                                 {
1313                                         $changed = true;
1314                                 }
1315                         }
1316                 }
1317
1318                 $current = self::flattenRestrictions( $current );
1319
1320                 $changed = ( $changed || $current != $updated );
1321                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1322                 $protect = ( $updated != '' );
1323
1324                 # If nothing's changed, do nothing
1325                 if ( $changed ) {
1326                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1327                                 $dbw = wfGetDB( DB_MASTER );
1328
1329                                 # Prepare a null revision to be added to the history
1330                                 $modified = $current != '' && $protect;
1331
1332                                 if ( $protect ) {
1333                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1334                                 } else {
1335                                         $comment_type = 'unprotectedarticle';
1336                                 }
1337
1338                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1339
1340                                 # Only restrictions with the 'protect' right can cascade...
1341                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1342                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1343
1344                                 # The schema allows multiple restrictions
1345                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1346                                         $cascade = false;
1347                                 }
1348
1349                                 $cascade_description = '';
1350
1351                                 if ( $cascade ) {
1352                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1353                                 }
1354
1355                                 if ( $reason ) {
1356                                         $comment .= ": $reason";
1357                                 }
1358
1359                                 $editComment = $comment;
1360                                 $encodedExpiry = array();
1361                                 $protect_description = '';
1362                                 foreach ( $limit as $action => $restrictions ) {
1363                                         if ( !isset( $expiry[$action] ) )
1364                                                 $expiry[$action] = $dbw->getInfinity();
1365
1366                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1367                                         if ( $restrictions != '' ) {
1368                                                 $protect_description .= "[$action=$restrictions] (";
1369                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1370                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1371                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1372                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1373                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1374                                                 } else {
1375                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1376                                                 }
1377
1378                                                 $protect_description .= ') ';
1379                                         }
1380                                 }
1381                                 $protect_description = trim( $protect_description );
1382
1383                                 if ( $protect_description && $protect ) {
1384                                         $editComment .= " ($protect_description)";
1385                                 }
1386
1387                                 if ( $cascade ) {
1388                                         $editComment .= "$cascade_description";
1389                                 }
1390
1391                                 # Update restrictions table
1392                                 foreach ( $limit as $action => $restrictions ) {
1393                                         if ( $restrictions != '' ) {
1394                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1395                                                         array( 'pr_page' => $id,
1396                                                                 'pr_type' => $action,
1397                                                                 'pr_level' => $restrictions,
1398                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1399                                                                 'pr_expiry' => $encodedExpiry[$action]
1400                                                         ),
1401                                                         __METHOD__
1402                                                 );
1403                                         } else {
1404                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1405                                                         'pr_type' => $action ), __METHOD__ );
1406                                         }
1407                                 }
1408
1409                                 # Insert a null revision
1410                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1411                                 $nullRevId = $nullRevision->insertOn( $dbw );
1412
1413                                 $latest = $this->getLatest();
1414                                 # Update page record
1415                                 $dbw->update( 'page',
1416                                         array( /* SET */
1417                                                 'page_touched' => $dbw->timestamp(),
1418                                                 'page_restrictions' => '',
1419                                                 'page_latest' => $nullRevId
1420                                         ), array( /* WHERE */
1421                                                 'page_id' => $id
1422                                         ), __METHOD__
1423                                 );
1424
1425                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1426                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1427
1428                                 # Update the protection log
1429                                 $log = new LogPage( 'protect' );
1430                                 if ( $protect ) {
1431                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1432                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1433                                 } else {
1434                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1435                                 }
1436                         } # End hook
1437                 } # End "changed" check
1438
1439                 return true;
1440         }
1441
1442         /**
1443          * Take an array of page restrictions and flatten it to a string
1444          * suitable for insertion into the page_restrictions field.
1445          * @param $limit Array
1446          * @return String
1447          */
1448         protected static function flattenRestrictions( $limit ) {
1449                 if ( !is_array( $limit ) ) {
1450                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1451                 }
1452
1453                 $bits = array();
1454                 ksort( $limit );
1455
1456                 foreach ( $limit as $action => $restrictions ) {
1457                         if ( $restrictions != '' ) {
1458                                 $bits[] = "$action=$restrictions";
1459                         }
1460                 }
1461
1462                 return implode( ':', $bits );
1463         }
1464
1465         /**
1466          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1467          */
1468         public function isBigDeletion() {
1469                 global $wgDeleteRevisionsLimit;
1470
1471                 if ( $wgDeleteRevisionsLimit ) {
1472                         $revCount = $this->estimateRevisionCount();
1473
1474                         return $revCount > $wgDeleteRevisionsLimit;
1475                 }
1476
1477                 return false;
1478         }
1479
1480         /**
1481          * @return int approximate revision count
1482          */
1483         public function estimateRevisionCount() {
1484                 $dbr = wfGetDB( DB_SLAVE );
1485
1486                 // For an exact count...
1487                 // return $dbr->selectField( 'revision', 'COUNT(*)',
1488                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
1489                 return $dbr->estimateRowCount( 'revision', '*',
1490                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1491         }
1492
1493         /**
1494          * Get the last N authors
1495          * @param $num Integer: number of revisions to get
1496          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1497          * @return array Array of authors, duplicates not removed
1498          */
1499         public function getLastNAuthors( $num, $revLatest = 0 ) {
1500                 wfProfileIn( __METHOD__ );
1501                 // First try the slave
1502                 // If that doesn't have the latest revision, try the master
1503                 $continue = 2;
1504                 $db = wfGetDB( DB_SLAVE );
1505
1506                 do {
1507                         $res = $db->select( array( 'page', 'revision' ),
1508                                 array( 'rev_id', 'rev_user_text' ),
1509                                 array(
1510                                         'page_namespace' => $this->mTitle->getNamespace(),
1511                                         'page_title' => $this->mTitle->getDBkey(),
1512                                         'rev_page = page_id'
1513                                 ), __METHOD__,
1514                                 array(
1515                                         'ORDER BY' => 'rev_timestamp DESC',
1516                                         'LIMIT' => $num
1517                                 )
1518                         );
1519
1520                         if ( !$res ) {
1521                                 wfProfileOut( __METHOD__ );
1522                                 return array();
1523                         }
1524
1525                         $row = $db->fetchObject( $res );
1526
1527                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1528                                 $db = wfGetDB( DB_MASTER );
1529                                 $continue--;
1530                         } else {
1531                                 $continue = 0;
1532                         }
1533                 } while ( $continue );
1534
1535                 $authors = array( $row->rev_user_text );
1536
1537                 foreach ( $res as $row ) {
1538                         $authors[] = $row->rev_user_text;
1539                 }
1540
1541                 wfProfileOut( __METHOD__ );
1542                 return $authors;
1543         }
1544
1545         /**
1546          * Back-end article deletion
1547          * Deletes the article with database consistency, writes logs, purges caches
1548          *
1549          * @param $reason string delete reason for deletion log
1550          * @param suppress bitfield
1551          *      Revision::DELETED_TEXT
1552          *      Revision::DELETED_COMMENT
1553          *      Revision::DELETED_USER
1554          *      Revision::DELETED_RESTRICTED
1555          * @param $id int article ID
1556          * @param $commit boolean defaults to true, triggers transaction end
1557          * @param &$errors Array of errors to append to
1558          * @param $user User The relevant user
1559          * @return boolean true if successful
1560          */
1561         public function doDeleteArticle(
1562                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1563         ) {
1564                 global $wgDeferredUpdateList, $wgUseTrackbacks, $wgUser;
1565                 $user = is_null( $user ) ? $wgUser : $user;
1566
1567                 wfDebug( __METHOD__ . "\n" );
1568
1569                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1570                         return false;
1571                 }
1572                 $dbw = wfGetDB( DB_MASTER );
1573                 $t = $this->mTitle->getDBkey();
1574                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1575
1576                 if ( $t === '' || $id == 0 ) {
1577                         return false;
1578                 }
1579
1580                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 );
1581                 array_push( $wgDeferredUpdateList, $u );
1582
1583                 // Bitfields to further suppress the content
1584                 if ( $suppress ) {
1585                         $bitfield = 0;
1586                         // This should be 15...
1587                         $bitfield |= Revision::DELETED_TEXT;
1588                         $bitfield |= Revision::DELETED_COMMENT;
1589                         $bitfield |= Revision::DELETED_USER;
1590                         $bitfield |= Revision::DELETED_RESTRICTED;
1591                 } else {
1592                         $bitfield = 'rev_deleted';
1593                 }
1594
1595                 $dbw->begin();
1596                 // For now, shunt the revision data into the archive table.
1597                 // Text is *not* removed from the text table; bulk storage
1598                 // is left intact to avoid breaking block-compression or
1599                 // immutable storage schemes.
1600                 //
1601                 // For backwards compatibility, note that some older archive
1602                 // table entries will have ar_text and ar_flags fields still.
1603                 //
1604                 // In the future, we may keep revisions and mark them with
1605                 // the rev_deleted field, which is reserved for this purpose.
1606                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1607                         array(
1608                                 'ar_namespace'  => 'page_namespace',
1609                                 'ar_title'      => 'page_title',
1610                                 'ar_comment'    => 'rev_comment',
1611                                 'ar_user'       => 'rev_user',
1612                                 'ar_user_text'  => 'rev_user_text',
1613                                 'ar_timestamp'  => 'rev_timestamp',
1614                                 'ar_minor_edit' => 'rev_minor_edit',
1615                                 'ar_rev_id'     => 'rev_id',
1616                                 'ar_text_id'    => 'rev_text_id',
1617                                 'ar_text'       => '\'\'', // Be explicit to appease
1618                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1619                                 'ar_len'        => 'rev_len',
1620                                 'ar_page_id'    => 'page_id',
1621                                 'ar_deleted'    => $bitfield
1622                         ), array(
1623                                 'page_id' => $id,
1624                                 'page_id = rev_page'
1625                         ), __METHOD__
1626                 );
1627
1628                 # Delete restrictions for it
1629                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1630
1631                 # Now that it's safely backed up, delete it
1632                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1633                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1634
1635                 if ( !$ok ) {
1636                         $dbw->rollback();
1637                         return false;
1638                 }
1639
1640                 # Fix category table counts
1641                 $cats = array();
1642                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1643
1644                 foreach ( $res as $row ) {
1645                         $cats [] = $row->cl_to;
1646                 }
1647
1648                 $this->updateCategoryCounts( array(), $cats );
1649
1650                 # If using cascading deletes, we can skip some explicit deletes
1651                 if ( !$dbw->cascadingDeletes() ) {
1652                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1653
1654                         if ( $wgUseTrackbacks )
1655                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1656
1657                         # Delete outgoing links
1658                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1659                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
1660                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
1661                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
1662                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
1663                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
1664                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ) );
1665                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
1666                 }
1667
1668                 # If using cleanup triggers, we can skip some manual deletes
1669                 if ( !$dbw->cleanupTriggers() ) {
1670                         # Clean up recentchanges entries...
1671                         $dbw->delete( 'recentchanges',
1672                                 array( 'rc_type != ' . RC_LOG,
1673                                         'rc_namespace' => $this->mTitle->getNamespace(),
1674                                         'rc_title' => $this->mTitle->getDBkey() ),
1675                                 __METHOD__ );
1676                         $dbw->delete( 'recentchanges',
1677                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1678                                 __METHOD__ );
1679                 }
1680
1681                 # Clear caches
1682                 self::onArticleDelete( $this->mTitle );
1683
1684                 # Clear the cached article id so the interface doesn't act like we exist
1685                 $this->mTitle->resetArticleID( 0 );
1686
1687                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1688                 $logtype = $suppress ? 'suppress' : 'delete';
1689                 $log = new LogPage( $logtype );
1690
1691                 # Make sure logging got through
1692                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
1693
1694                 if ( $commit ) {
1695                         $dbw->commit();
1696                 }
1697
1698                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1699                 return true;
1700         }
1701
1702         /**
1703          * Roll back the most recent consecutive set of edits to a page
1704          * from the same user; fails if there are no eligible edits to
1705          * roll back to, e.g. user is the sole contributor. This function
1706          * performs permissions checks on $user, then calls commitRollback()
1707          * to do the dirty work
1708          *
1709          * @param $fromP String: Name of the user whose edits to rollback.
1710          * @param $summary String: Custom summary. Set to default summary if empty.
1711          * @param $token String: Rollback token.
1712          * @param $bot Boolean: If true, mark all reverted edits as bot.
1713          *
1714          * @param $resultDetails Array: contains result-specific array of additional values
1715          *    'alreadyrolled' : 'current' (rev)
1716          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1717          *
1718          * @param $user User The user performing the rollback
1719          * @return array of errors, each error formatted as
1720          *   array(messagekey, param1, param2, ...).
1721          * On success, the array is empty.  This array can also be passed to
1722          * OutputPage::showPermissionsErrorPage().
1723          */
1724         public function doRollback(
1725                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1726         ) {
1727                 $resultDetails = null;
1728
1729                 # Check permissions
1730                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1731                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1732                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1733
1734                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1735                         $errors[] = array( 'sessionfailure' );
1736                 }
1737
1738                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1739                         $errors[] = array( 'actionthrottledtext' );
1740                 }
1741
1742                 # If there were errors, bail out now
1743                 if ( !empty( $errors ) ) {
1744                         return $errors;
1745                 }
1746
1747                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1748         }
1749
1750         /**
1751          * Backend implementation of doRollback(), please refer there for parameter
1752          * and return value documentation
1753          *
1754          * NOTE: This function does NOT check ANY permissions, it just commits the
1755          * rollback to the DB Therefore, you should only call this function direct-
1756          * ly if you want to use custom permissions checks. If you don't, use
1757          * doRollback() instead.
1758          * @param $fromP String: Name of the user whose edits to rollback.
1759          * @param $summary String: Custom summary. Set to default summary if empty.
1760          * @param $bot Boolean: If true, mark all reverted edits as bot.
1761          *
1762          * @param $resultDetails Array: contains result-specific array of additional values
1763          * @param $guser User The user performing the rollback
1764          */
1765         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1766                 global $wgUseRCPatrol, $wgContLang;
1767
1768                 $dbw = wfGetDB( DB_MASTER );
1769
1770                 if ( wfReadOnly() ) {
1771                         return array( array( 'readonlytext' ) );
1772                 }
1773
1774                 # Get the last editor
1775                 $current = Revision::newFromTitle( $this->mTitle );
1776                 if ( is_null( $current ) ) {
1777                         # Something wrong... no page?
1778                         return array( array( 'notanarticle' ) );
1779                 }
1780
1781                 $from = str_replace( '_', ' ', $fromP );
1782                 # User name given should match up with the top revision.
1783                 # If the user was deleted then $from should be empty.
1784                 if ( $from != $current->getUserText() ) {
1785                         $resultDetails = array( 'current' => $current );
1786                         return array( array( 'alreadyrolled',
1787                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1788                                 htmlspecialchars( $fromP ),
1789                                 htmlspecialchars( $current->getUserText() )
1790                         ) );
1791                 }
1792
1793                 # Get the last edit not by this guy...
1794                 # Note: these may not be public values
1795                 $user = intval( $current->getRawUser() );
1796                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1797                 $s = $dbw->selectRow( 'revision',
1798                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1799                         array( 'rev_page' => $current->getPage(),
1800                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1801                         ), __METHOD__,
1802                         array( 'USE INDEX' => 'page_timestamp',
1803                                 'ORDER BY' => 'rev_timestamp DESC' )
1804                         );
1805                 if ( $s === false ) {
1806                         # No one else ever edited this page
1807                         return array( array( 'cantrollback' ) );
1808                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1809                         # Only admins can see this text
1810                         return array( array( 'notvisiblerev' ) );
1811                 }
1812
1813                 $set = array();
1814                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1815                         # Mark all reverted edits as bot
1816                         $set['rc_bot'] = 1;
1817                 }
1818
1819                 if ( $wgUseRCPatrol ) {
1820                         # Mark all reverted edits as patrolled
1821                         $set['rc_patrolled'] = 1;
1822                 }
1823
1824                 if ( count( $set ) ) {
1825                         $dbw->update( 'recentchanges', $set,
1826                                 array( /* WHERE */
1827                                         'rc_cur_id' => $current->getPage(),
1828                                         'rc_user_text' => $current->getUserText(),
1829                                         "rc_timestamp > '{$s->rev_timestamp}'",
1830                                 ), __METHOD__
1831                         );
1832                 }
1833
1834                 # Generate the edit summary if necessary
1835                 $target = Revision::newFromId( $s->rev_id );
1836                 if ( empty( $summary ) ) {
1837                         if ( $from == '' ) { // no public user name
1838                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1839                         } else {
1840                                 $summary = wfMsgForContent( 'revertpage' );
1841                         }
1842                 }
1843
1844                 # Allow the custom summary to use the same args as the default message
1845                 $args = array(
1846                         $target->getUserText(), $from, $s->rev_id,
1847                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1848                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1849                 );
1850                 $summary = wfMsgReplaceArgs( $summary, $args );
1851
1852                 # Save
1853                 $flags = EDIT_UPDATE;
1854
1855                 if ( $guser->isAllowed( 'minoredit' ) ) {
1856                         $flags |= EDIT_MINOR;
1857                 }
1858
1859                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1860                         $flags |= EDIT_FORCE_BOT;
1861                 }
1862
1863                 # Actually store the edit
1864                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1865                 if ( !empty( $status->value['revision'] ) ) {
1866                         $revId = $status->value['revision']->getId();
1867                 } else {
1868                         $revId = false;
1869                 }
1870
1871                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1872
1873                 $resultDetails = array(
1874                         'summary' => $summary,
1875                         'current' => $current,
1876                         'target'  => $target,
1877                         'newid'   => $revId
1878                 );
1879
1880                 return array();
1881         }
1882
1883         /**
1884          * Do standard deferred updates after page view
1885          * @param $user User The relevant user
1886          */
1887         public function doViewUpdates( User $user ) {
1888                 global $wgDeferredUpdateList, $wgDisableCounters;
1889                 if ( wfReadOnly() ) {
1890                         return;
1891                 }
1892
1893                 # Don't update page view counters on views from bot users (bug 14044)
1894                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1895                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getId() );
1896                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
1897                 }
1898
1899                 # Update newtalk / watchlist notification status
1900                 $user->clearNotification( $this->mTitle );
1901         }
1902
1903         /**
1904          * Prepare text which is about to be saved.
1905          * Returns a stdclass with source, pst and output members
1906          */
1907         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1908                 global $wgParser, $wgUser;
1909                 $user = is_null( $user ) ? $wgUser : $user;
1910                 // @TODO fixme: check $user->getId() here???
1911                 if ( $this->mPreparedEdit
1912                         && $this->mPreparedEdit->newText == $text
1913                         && $this->mPreparedEdit->revid == $revid
1914                 ) {
1915                         // Already prepared
1916                         return $this->mPreparedEdit;
1917                 }
1918
1919                 $popts = ParserOptions::newFromUser( $user );
1920                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1921
1922                 $edit = (object)array();
1923                 $edit->revid = $revid;
1924                 $edit->newText = $text;
1925                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1926                 $edit->popts = $this->getParserOptions( true );
1927                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1928                 $edit->oldText = $this->getRawText();
1929
1930                 $this->mPreparedEdit = $edit;
1931
1932                 return $edit;
1933         }
1934
1935         /**
1936          * Do standard deferred updates after page edit.
1937          * Update links tables, site stats, search index and message cache.
1938          * Purges pages that include this page if the text was changed here.
1939          * Every 100th edit, prune the recent changes table.
1940          *
1941          * @private
1942          * @param $revision Revision object
1943          * @param $user User object that did the revision
1944          * @param $options Array of options, following indexes are used:
1945          * - changed: boolean, whether the revision changed the content (default true)
1946          * - created: boolean, whether the revision created the page (default false)
1947          * - oldcountable: boolean or null (default null):
1948          *   - boolean: whether the page was counted as an article before that
1949          *     revision, only used in changed is true and created is false
1950          *   - null: don't change the article count
1951          */
1952         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1953                 global $wgDeferredUpdateList, $wgEnableParserCache;
1954
1955                 wfProfileIn( __METHOD__ );
1956
1957                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1958                 $text = $revision->getText();
1959
1960                 # Parse the text
1961                 # Be careful not to double-PST: $text is usually already PST-ed once
1962                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1963                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1964                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1965                 } else {
1966                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1967                         $editInfo = $this->mPreparedEdit;
1968                 }
1969
1970                 # Save it to the parser cache
1971                 if ( $wgEnableParserCache ) {
1972                         $parserCache = ParserCache::singleton();
1973                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1974                 }
1975
1976                 # Update the links tables
1977                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1978                 $u->doUpdate();
1979
1980                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1981
1982                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1983                         if ( 0 == mt_rand( 0, 99 ) ) {
1984                                 // Flush old entries from the `recentchanges` table; we do this on
1985                                 // random requests so as to avoid an increase in writes for no good reason
1986                                 global $wgRCMaxAge;
1987
1988                                 $dbw = wfGetDB( DB_MASTER );
1989                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1990                                 $dbw->delete(
1991                                         'recentchanges',
1992                                         array( "rc_timestamp < '$cutoff'" ),
1993                                         __METHOD__
1994                                 );
1995                         }
1996                 }
1997
1998                 $id = $this->getId();
1999                 $title = $this->mTitle->getPrefixedDBkey();
2000                 $shortTitle = $this->mTitle->getDBkey();
2001
2002                 if ( 0 == $id ) {
2003                         wfProfileOut( __METHOD__ );
2004                         return;
2005                 }
2006
2007                 if ( !$options['changed'] ) {
2008                         $good = 0;
2009                         $total = 0;
2010                 } elseif ( $options['created'] ) {
2011                         $good = (int)$this->isCountable( $editInfo );
2012                         $total = 1;
2013                 } elseif ( $options['oldcountable'] !== null ) {
2014                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2015                         $total = 0;
2016                 } else {
2017                         $good = 0;
2018                         $total = 0;
2019                 }
2020
2021                 $wgDeferredUpdateList[] = new SiteStatsUpdate( 0, 1, $good, $total );
2022                 $wgDeferredUpdateList[] = new SearchUpdate( $id, $title, $text );
2023
2024                 # If this is another user's talk page, update newtalk.
2025                 # Don't do this if $options['changed'] = false (null-edits) nor if
2026                 # it's a minor edit and the user doesn't want notifications for those.
2027                 if ( $options['changed']
2028                         && $this->mTitle->getNamespace() == NS_USER_TALK
2029                         && $shortTitle != $user->getTitleKey()
2030                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2031                 ) {
2032                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2033                                 $other = User::newFromName( $shortTitle, false );
2034                                 if ( !$other ) {
2035                                         wfDebug( __METHOD__ . ": invalid username\n" );
2036                                 } elseif ( User::isIP( $shortTitle ) ) {
2037                                         // An anonymous user
2038                                         $other->setNewtalk( true );
2039                                 } elseif ( $other->isLoggedIn() ) {
2040                                         $other->setNewtalk( true );
2041                                 } else {
2042                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2043                                 }
2044                         }
2045                 }
2046
2047                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2048                         MessageCache::singleton()->replace( $shortTitle, $text );
2049                 }
2050
2051                 if( $options['created'] ) {
2052                         self::onArticleCreate( $this->mTitle );
2053                 } else {
2054                         self::onArticleEdit( $this->mTitle );
2055                 }
2056
2057                 wfProfileOut( __METHOD__ );
2058         }
2059
2060         /**
2061          * Perform article updates on a special page creation.
2062          *
2063          * @param $rev Revision object
2064          *
2065          * @todo This is a shitty interface function. Kill it and replace the
2066          * other shitty functions like doEditUpdates and such so it's not needed
2067          * anymore.
2068          * @deprecated since 1.19, use doEditUpdates()
2069          */
2070         public function createUpdates( $rev ) {
2071                 global $wgUser;
2072                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2073         }
2074
2075         /**
2076          * This function is called right before saving the wikitext,
2077          * so we can do things like signatures and links-in-context.
2078          *
2079          * @param $text String article contents
2080          * @param $user User object: user doing the edit
2081          * @param $popts ParserOptions object: parser options, default options for
2082          *               the user loaded if null given
2083          * @return string article contents with altered wikitext markup (signatures
2084          *      converted, {{subst:}}, templates, etc.)
2085          */
2086         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2087                 global $wgParser, $wgUser;
2088                 $user = is_null( $user ) ? $wgUser : $user;
2089
2090                 if ( $popts === null ) {
2091                         $popts = ParserOptions::newFromUser( $user );
2092                 }
2093
2094                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2095         }
2096
2097         /**
2098          * Loads page_touched and returns a value indicating if it should be used
2099          * @return boolean true if not a redirect
2100          */
2101         public function checkTouched() {
2102                 if ( !$this->mDataLoaded ) {
2103                         $this->loadPageData();
2104                 }
2105                 return !$this->mIsRedirect;
2106         }
2107
2108         /**
2109          * Get the page_touched field
2110          * @return string containing GMT timestamp
2111          */
2112         public function getTouched() {
2113                 if ( !$this->mDataLoaded ) {
2114                         $this->loadPageData();
2115                 }
2116                 return $this->mTouched;
2117         }
2118
2119         /**
2120          * Get the page_latest field
2121          * @return integer rev_id of current revision
2122          */
2123         public function getLatest() {
2124                 if ( !$this->mDataLoaded ) {
2125                         $this->loadPageData();
2126                 }
2127                 return (int)$this->mLatest;
2128         }
2129
2130         /**
2131          * Edit an article without doing all that other stuff
2132          * The article must already exist; link tables etc
2133          * are not updated, caches are not flushed.
2134          *
2135          * @param $text String: text submitted
2136          * @param $user User The relevant user
2137          * @param $comment String: comment submitted
2138          * @param $minor Boolean: whereas it's a minor modification
2139          */
2140         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2141                 wfProfileIn( __METHOD__ );
2142
2143                 $dbw = wfGetDB( DB_MASTER );
2144                 $revision = new Revision( array(
2145                         'page'       => $this->getId(),
2146                         'text'       => $text,
2147                         'comment'    => $comment,
2148                         'minor_edit' => $minor ? 1 : 0,
2149                 ) );
2150                 $revision->insertOn( $dbw );
2151                 $this->updateRevisionOn( $dbw, $revision );
2152
2153                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2154
2155                 wfProfileOut( __METHOD__ );
2156         }
2157
2158         /**
2159          * The onArticle*() functions are supposed to be a kind of hooks
2160          * which should be called whenever any of the specified actions
2161          * are done.
2162          *
2163          * This is a good place to put code to clear caches, for instance.
2164          *
2165          * This is called on page move and undelete, as well as edit
2166          *
2167          * @param $title Title object
2168          */
2169         public static function onArticleCreate( $title ) {
2170                 # Update existence markers on article/talk tabs...
2171                 if ( $title->isTalkPage() ) {
2172                         $other = $title->getSubjectPage();
2173                 } else {
2174                         $other = $title->getTalkPage();
2175                 }
2176
2177                 $other->invalidateCache();
2178                 $other->purgeSquid();
2179
2180                 $title->touchLinks();
2181                 $title->purgeSquid();
2182                 $title->deleteTitleProtection();
2183         }
2184
2185         /**
2186          * Clears caches when article is deleted
2187          *
2188          * @param $title Title
2189          */
2190         public static function onArticleDelete( $title ) {
2191                 # Update existence markers on article/talk tabs...
2192                 if ( $title->isTalkPage() ) {
2193                         $other = $title->getSubjectPage();
2194                 } else {
2195                         $other = $title->getTalkPage();
2196                 }
2197
2198                 $other->invalidateCache();
2199                 $other->purgeSquid();
2200
2201                 $title->touchLinks();
2202                 $title->purgeSquid();
2203
2204                 # File cache
2205                 HTMLFileCache::clearFileCache( $title );
2206
2207                 # Messages
2208                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2209                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2210                 }
2211
2212                 # Images
2213                 if ( $title->getNamespace() == NS_FILE ) {
2214                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2215                         $update->doUpdate();
2216                 }
2217
2218                 # User talk pages
2219                 if ( $title->getNamespace() == NS_USER_TALK ) {
2220                         $user = User::newFromName( $title->getText(), false );
2221                         $user->setNewtalk( false );
2222                 }
2223
2224                 # Image redirects
2225                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2226         }
2227
2228         /**
2229          * Purge caches on page update etc
2230          *
2231          * @param $title Title object
2232          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2233          */
2234         public static function onArticleEdit( $title ) {
2235                 global $wgDeferredUpdateList;
2236
2237                 // Invalidate caches of articles which include this page
2238                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
2239
2240                 // Invalidate the caches of all pages which redirect here
2241                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
2242
2243                 # Purge squid for this page only
2244                 $title->purgeSquid();
2245
2246                 # Clear file cache for this page only
2247                 HTMLFileCache::clearFileCache( $title );
2248         }
2249
2250         /**#@-*/
2251
2252         /**
2253          * Return a list of templates used by this article.
2254          * Uses the templatelinks table
2255          *
2256          * @return Array of Title objects
2257          */
2258         public function getUsedTemplates() {
2259                 $result = array();
2260                 $id = $this->mTitle->getArticleID();
2261
2262                 if ( $id == 0 ) {
2263                         return array();
2264                 }
2265
2266                 $dbr = wfGetDB( DB_SLAVE );
2267                 $res = $dbr->select( array( 'templatelinks' ),
2268                         array( 'tl_namespace', 'tl_title' ),
2269                         array( 'tl_from' => $id ),
2270                         __METHOD__ );
2271
2272                 if ( $res !== false ) {
2273                         foreach ( $res as $row ) {
2274                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2275                         }
2276                 }
2277
2278                 return $result;
2279         }
2280
2281         /**
2282          * Returns a list of hidden categories this page is a member of.
2283          * Uses the page_props and categorylinks tables.
2284          *
2285          * @return Array of Title objects
2286          */
2287         public function getHiddenCategories() {
2288                 $result = array();
2289                 $id = $this->mTitle->getArticleID();
2290
2291                 if ( $id == 0 ) {
2292                         return array();
2293                 }
2294
2295                 $dbr = wfGetDB( DB_SLAVE );
2296                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2297                         array( 'cl_to' ),
2298                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2299                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2300                         __METHOD__ );
2301
2302                 if ( $res !== false ) {
2303                         foreach ( $res as $row ) {
2304                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2305                         }
2306                 }
2307
2308                 return $result;
2309         }
2310
2311         /**
2312         * Return an applicable autosummary if one exists for the given edit.
2313         * @param $oldtext String: the previous text of the page.
2314         * @param $newtext String: The submitted text of the page.
2315         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2316         * @return string An appropriate autosummary, or an empty string.
2317         */
2318         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2319                 global $wgContLang;
2320
2321                 # Decide what kind of autosummary is needed.
2322
2323                 # Redirect autosummaries
2324                 $ot = Title::newFromRedirect( $oldtext );
2325                 $rt = Title::newFromRedirect( $newtext );
2326
2327                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2328                         $truncatedtext = $wgContLang->truncate(
2329                                 str_replace( "\n", ' ', $newtext ),
2330                                 max( 0, 250
2331                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2332                                         - strlen( $rt->getFullText() )
2333                                 ) );
2334                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2335                 }
2336
2337                 # New page autosummaries
2338                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2339                         # If they're making a new article, give its text, truncated, in the summary.
2340
2341                         $truncatedtext = $wgContLang->truncate(
2342                                 str_replace( "\n", ' ', $newtext ),
2343                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2344
2345                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2346                 }
2347
2348                 # Blanking autosummaries
2349                 if ( $oldtext != '' && $newtext == '' ) {
2350                         return wfMsgForContent( 'autosumm-blank' );
2351                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2352                         # Removing more than 90% of the article
2353
2354                         $truncatedtext = $wgContLang->truncate(
2355                                 $newtext,
2356                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2357
2358                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2359                 }
2360
2361                 # If we reach this point, there's no applicable autosummary for our case, so our
2362                 # autosummary is empty.
2363                 return '';
2364         }
2365
2366         /**
2367          * Get parser options suitable for rendering the primary article wikitext
2368          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
2369          * @return mixed ParserOptions object or boolean false
2370          */
2371         public function getParserOptions( $canonical = false ) {
2372                 global $wgUser, $wgLanguageCode;
2373
2374                 if ( !$this->mParserOptions || $canonical ) {
2375                         $user = !$canonical ? $wgUser : new User;
2376                         $parserOptions = new ParserOptions( $user );
2377                         $parserOptions->setTidy( true );
2378                         $parserOptions->enableLimitReport();
2379
2380                         if ( $canonical ) {
2381                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
2382                                 return $parserOptions;
2383                         }
2384                         $this->mParserOptions = $parserOptions;
2385                 }
2386                 // Clone to allow modifications of the return value without affecting cache
2387                 return clone $this->mParserOptions;
2388         }
2389
2390         /**
2391         * Get parser options suitable for rendering the primary article wikitext
2392         * @param User $user
2393         * @return ParserOptions
2394         */
2395         public function makeParserOptions( User $user ) {
2396                 $options = ParserOptions::newFromUser( $user );
2397                 $options->enableLimitReport(); // show inclusion/loop reports
2398                 $options->setTidy( true ); // fix bad HTML
2399                 return $options;
2400         }
2401
2402         /**
2403          * Update all the appropriate counts in the category table, given that
2404          * we've added the categories $added and deleted the categories $deleted.
2405          *
2406          * @param $added array   The names of categories that were added
2407          * @param $deleted array The names of categories that were deleted
2408          */
2409         public function updateCategoryCounts( $added, $deleted ) {
2410                 $ns = $this->mTitle->getNamespace();
2411                 $dbw = wfGetDB( DB_MASTER );
2412
2413                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2414                 # exist, we might legitimately not create it, but it's simpler to just
2415                 # create it and then give it a negative value, since the value is bogus
2416                 # anyway.
2417                 #
2418                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2419                 $insertCats = array_merge( $added, $deleted );
2420                 if ( !$insertCats ) {
2421                         # Okay, nothing to do
2422                         return;
2423                 }
2424
2425                 $insertRows = array();
2426
2427                 foreach ( $insertCats as $cat ) {
2428                         $insertRows[] = array(
2429                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2430                                 'cat_title' => $cat
2431                         );
2432                 }
2433                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2434
2435                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2436                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2437
2438                 if ( $ns == NS_CATEGORY ) {
2439                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2440                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2441                 } elseif ( $ns == NS_FILE ) {
2442                         $addFields[]    = 'cat_files = cat_files + 1';
2443                         $removeFields[] = 'cat_files = cat_files - 1';
2444                 }
2445
2446                 if ( $added ) {
2447                         $dbw->update(
2448                                 'category',
2449                                 $addFields,
2450                                 array( 'cat_title' => $added ),
2451                                 __METHOD__
2452                         );
2453                 }
2454
2455                 if ( $deleted ) {
2456                         $dbw->update(
2457                                 'category',
2458                                 $removeFields,
2459                                 array( 'cat_title' => $deleted ),
2460                                 __METHOD__
2461                         );
2462                 }
2463         }
2464
2465         /**
2466          * Updates cascading protections
2467          *
2468          * @param $parserOutput ParserOutput object for the current version
2469          **/
2470         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2471                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2472                         return;
2473                 }
2474
2475                 // templatelinks table may have become out of sync,
2476                 // especially if using variable-based transclusions.
2477                 // For paranoia, check if things have changed and if
2478                 // so apply updates to the database. This will ensure
2479                 // that cascaded protections apply as soon as the changes
2480                 // are visible.
2481
2482                 # Get templates from templatelinks
2483                 $id = $this->mTitle->getArticleID();
2484
2485                 $tlTemplates = array();
2486
2487                 $dbr = wfGetDB( DB_SLAVE );
2488                 $res = $dbr->select( array( 'templatelinks' ),
2489                         array( 'tl_namespace', 'tl_title' ),
2490                         array( 'tl_from' => $id ),
2491                         __METHOD__
2492                 );
2493
2494                 foreach ( $res as $row ) {
2495                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2496                 }
2497
2498                 # Get templates from parser output.
2499                 $poTemplates = array();
2500                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2501                         foreach ( $templates as $dbk => $id ) {
2502                                 $poTemplates["$ns:$dbk"] = true;
2503                         }
2504                 }
2505
2506                 # Get the diff
2507                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2508
2509                 if ( count( $templates_diff ) > 0 ) {
2510                         # Whee, link updates time.
2511                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2512                         $u->doUpdate();
2513                 }
2514         }
2515
2516         /*
2517         * @deprecated since 1.19
2518         */
2519         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2520                 global $wgUser;
2521                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2522         }
2523
2524         /*
2525         * @deprecated since 1.19
2526         */
2527         public function viewUpdates() {
2528                 global $wgUser;
2529                 return $this->doViewUpdates( $wgUser );
2530         }
2531
2532         /*
2533         * @deprecated since 1.19
2534         */
2535         public function useParserCache( $oldid ) {
2536                 global $wgUser;
2537                 return $this->isParserCacheUsed( $wgUser, $oldid );
2538         }
2539 }