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  * @TODO: dependency inject $wgUser as an argument to functions
  14  *
  15  * @internal documentation reviewed 15 Mar 2010
  16  */
  17 class WikiPage extends Page {
  18         /**@{{
  19          * @protected
  20          * Fields are public for backwards-compatibility. Use accessors.
  21          * In the past, this class was part of Article.php and everything was public.
  22          */
  23         public $mTitle = null;               // !< Title object
  24         public $mCounter = -1;               // !< Not loaded
  25         public $mDataLoaded = false;         // !<
  26         public $mIsRedirect = false;         // !<
  27         public $mLatest = false;             // !<
  28         public $mPreparedEdit = false;           // !<
  29         public $mRedirectTarget = null;          // !< Title object
  30         public $mLastRevision = null;            // !< Revision object
  31         public $mTimestamp = '';             // !<
  32         public $mTouched = '19700101000000'; // !<
  33         /**@}}*/
  34
  35         /**
  36          * @protected
  37          * @var ParserOptions: ParserOptions object for $wgUser articles
  38          */
  39         public $mParserOptions;
  40
  41         /**
  42          * Constructor and clear the article
  43          * @param $title Title Reference to a Title object.
  44          */
  45         public function __construct( Title $title ) {
  46                 $this->mTitle = $title;
  47         }
  48
  49         /**
  50          * Constructor from a page id
  51          * @param $id Int article ID to load
  52          */
  53         public static function newFromID( $id ) {
  54                 $t = Title::newFromID( $id );
  55                 # @todo FIXME: Doesn't inherit right
  56                 return $t == null ? null : new self( $t );
  57                 # return $t == null ? null : new static( $t ); // PHP 5.3
  58         }
  59
  60         /**
  61          * If this page is a redirect, get its target
  62          *
  63          * The target will be fetched from the redirect table if possible.
  64          * If this page doesn't have an entry there, call insertRedirect()
  65          * @return Title|mixed object, or null if this page is not a redirect
  66          */
  67         public function getRedirectTarget() {
  68                 if ( !$this->mTitle->isRedirect() ) {
  69                         return null;
  70                 }
  71
  72                 if ( $this->mRedirectTarget !== null ) {
  73                         return $this->mRedirectTarget;
  74                 }
  75
  76                 # Query the redirect table
  77                 $dbr = wfGetDB( DB_SLAVE );
  78                 $row = $dbr->selectRow( 'redirect',
  79                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  80                         array( 'rd_from' => $this->getID() ),
  81                         __METHOD__
  82                 );
  83
  84                 // rd_fragment and rd_interwiki were added later, populate them if empty
  85                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
  86                         return $this->mRedirectTarget = Title::makeTitle(
  87                                 $row->rd_namespace, $row->rd_title,
  88                                 $row->rd_fragment, $row->rd_interwiki );
  89                 }
  90
  91                 # This page doesn't have an entry in the redirect table
  92                 return $this->mRedirectTarget = $this->insertRedirect();
  93         }
  94
  95         /**
  96          * Insert an entry for this page into the redirect table.
  97          *
  98          * Don't call this function directly unless you know what you're doing.
  99          * @return Title object or null if not a redirect
 100          */
 101         public function insertRedirect() {
 102                 // recurse through to only get the final target
 103                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 104                 if ( !$retval ) {
 105                         return null;
 106                 }
 107                 $this->insertRedirectEntry( $retval );
 108                 return $retval;
 109         }
 110
 111         /**
 112          * Insert or update the redirect table entry for this page to indicate
 113          * it redirects to $rt .
 114          * @param $rt Title redirect target
 115          */
 116         public function insertRedirectEntry( $rt ) {
 117                 $dbw = wfGetDB( DB_MASTER );
 118                 $dbw->replace( 'redirect', array( 'rd_from' ),
 119                         array(
 120                                 'rd_from'               => $this->getID(),
 121                                 'rd_namespace'  => $rt->getNamespace(),
 122                                 'rd_title'              => $rt->getDBkey(),
 123                                 'rd_fragment'   => $rt->getFragment(),
 124                                 'rd_interwiki'  => $rt->getInterwiki(),
 125                         ),
 126                         __METHOD__
 127                 );
 128         }
 129
 130         /**
 131          * Get the Title object or URL this page redirects to
 132          *
 133          * @return mixed false, Title of in-wiki target, or string with URL
 134          */
 135         public function followRedirect() {
 136                 return $this->getRedirectURL( $this->getRedirectTarget() );
 137         }
 138
 139         /**
 140          * Get the Title object or URL to use for a redirect. We use Title
 141          * objects for same-wiki, non-special redirects and URLs for everything
 142          * else.
 143          * @param $rt Title Redirect target
 144          * @return mixed false, Title object of local target, or string with URL
 145          */
 146         public function getRedirectURL( $rt ) {
 147                 if ( $rt ) {
 148                         if ( $rt->getInterwiki() != '' ) {
 149                                 if ( $rt->isLocal() ) {
 150                                         // Offsite wikis need an HTTP redirect.
 151                                         //
 152                                         // This can be hard to reverse and may produce loops,
 153                                         // so they may be disabled in the site configuration.
 154                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 155                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 156                                 }
 157                         } else {
 158                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 159                                         // Gotta handle redirects to special pages differently:
 160                                         // Fill the HTTP response "Location" header and ignore
 161                                         // the rest of the page we're on.
 162                                         //
 163                                         // This can be hard to reverse, so they may be disabled.
 164                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 165                                                 // rolleyes
 166                                         } else {
 167                                                 return $rt->getFullURL();
 168                                         }
 169                                 }
 170
 171                                 return $rt;
 172                         }
 173                 }
 174
 175                 // No or invalid redirect
 176                 return false;
 177         }
 178
 179         /**
 180          * Get the title object of the article
 181          * @return Title object of this page
 182          */
 183         public function getTitle() {
 184                 return $this->mTitle;
 185         }
 186
 187         /**
 188          * Clear the object
 189          */
 190         public function clear() {
 191                 $this->mDataLoaded = false;
 192
 193                 $this->mCounter = -1; # Not loaded
 194                 $this->mRedirectTarget = null; # Title object if set
 195                 $this->mLastRevision = null; # Latest revision
 196                 $this->mTimestamp = '';
 197                 $this->mTouched = '19700101000000';
 198                 $this->mIsRedirect = false;
 199                 $this->mLatest = false;
 200                 $this->mPreparedEdit = false;
 201         }
 202
 203         /**
 204          * Get the text that needs to be saved in order to undo all revisions
 205          * between $undo and $undoafter. Revisions must belong to the same page,
 206          * must exist and must not be deleted
 207          * @param $undo Revision
 208          * @param $undoafter Revision Must be an earlier revision than $undo
 209          * @return mixed string on success, false on failure
 210          */
 211         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 212                 $cur_text = $this->getRawText();
 213                 if ( $cur_text === false ) {
 214                         return false; // no page
 215                 }
 216                 $undo_text = $undo->getText();
 217                 $undoafter_text = $undoafter->getText();
 218
 219                 if ( $cur_text == $undo_text ) {
 220                         # No use doing a merge if it's just a straight revert.
 221                         return $undoafter_text;
 222                 }
 223
 224                 $undone_text = '';
 225
 226                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 227                         return false;
 228                 }
 229
 230                 return $undone_text;
 231         }
 232
 233         /**
 234          * Return the list of revision fields that should be selected to create
 235          * a new page.
 236          */
 237         public static function selectFields() {
 238                 return array(
 239                         'page_id',
 240                         'page_namespace',
 241                         'page_title',
 242                         'page_restrictions',
 243                         'page_counter',
 244                         'page_is_redirect',
 245                         'page_is_new',
 246                         'page_random',
 247                         'page_touched',
 248                         'page_latest',
 249                         'page_len',
 250                 );
 251         }
 252
 253         /**
 254          * Fetch a page record with the given conditions
 255          * @param $dbr DatabaseBase object
 256          * @param $conditions Array
 257          * @return mixed Database result resource, or false on failure
 258          */
 259         protected function pageData( $dbr, $conditions ) {
 260                 $fields = self::selectFields();
 261
 262                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 263
 264                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 265
 266                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 267
 268                 return $row;
 269         }
 270
 271         /**
 272          * Fetch a page record matching the Title object's namespace and title
 273          * using a sanitized title string
 274          *
 275          * @param $dbr DatabaseBase object
 276          * @param $title Title object
 277          * @return mixed Database result resource, or false on failure
 278          */
 279         protected function pageDataFromTitle( $dbr, $title ) {
 280                 return $this->pageData( $dbr, array(
 281                         'page_namespace' => $title->getNamespace(),
 282                         'page_title'     => $title->getDBkey() ) );
 283         }
 284
 285         /**
 286          * Fetch a page record matching the requested ID
 287          *
 288          * @param $dbr DatabaseBase
 289          * @param $id Integer
 290          * @return mixed Database result resource, or false on failure
 291          */
 292         protected function pageDataFromId( $dbr, $id ) {
 293                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 294         }
 295
 296         /**
 297          * Set the general counter, title etc data loaded from
 298          * some source.
 299          *
 300          * @param $data Object|String $res->fetchObject() object or the string "fromdb" to reload
 301          */
 302         public function loadPageData( $data = 'fromdb' ) {
 303                 if ( $data === 'fromdb' ) {
 304                         $dbr = wfGetDB( DB_SLAVE );
 305                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 306                 }
 307
 308                 $lc = LinkCache::singleton();
 309
 310                 if ( $data ) {
 311                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 312
 313                         $this->mTitle->mArticleID = intval( $data->page_id );
 314
 315                         # Old-fashioned restrictions
 316                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 317
 318                         $this->mCounter     = intval( $data->page_counter );
 319                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 320                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 321                         $this->mLatest      = intval( $data->page_latest );
 322                 } else {
 323                         $lc->addBadLinkObj( $this->mTitle );
 324                         $this->mTitle->mArticleID = 0;
 325                 }
 326
 327                 $this->mDataLoaded = true;
 328         }
 329
 330         /**
 331          * @return int Page ID
 332          */
 333         public function getID() {
 334                 return $this->mTitle->getArticleID();
 335         }
 336
 337         /**
 338          * @return bool Whether or not the page exists in the database
 339          */
 340         public function exists() {
 341                 return $this->getId() > 0;
 342         }
 343
 344         /**
 345          * Check if this page is something we're going to be showing
 346          * some sort of sensible content for. If we return false, page
 347          * views (plain action=view) will return an HTTP 404 response,
 348          * so spiders and robots can know they're following a bad link.
 349          *
 350          * @return bool
 351          */
 352         public function hasViewableContent() {
 353                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 354         }
 355
 356         /**
 357          * @return int The view count for the page
 358          */
 359         public function getCount() {
 360                 if ( -1 == $this->mCounter ) {
 361                         $id = $this->getID();
 362
 363                         if ( $id == 0 ) {
 364                                 $this->mCounter = 0;
 365                         } else {
 366                                 $dbr = wfGetDB( DB_SLAVE );
 367                                 $this->mCounter = $dbr->selectField( 'page',
 368                                         'page_counter',
 369                                         array( 'page_id' => $id ),
 370                                         __METHOD__
 371                                 );
 372                         }
 373                 }
 374
 375                 return $this->mCounter;
 376         }
 377
 378         /**
 379          * Determine whether a page would be suitable for being counted as an
 380          * article in the site_stats table based on the title & its content
 381          *
 382          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 383          *        if false, the current database state will be used
 384          * @return Boolean
 385          */
 386         public function isCountable( $editInfo = false ) {
 387                 global $wgArticleCountMethod;
 388
 389                 if ( !$this->mTitle->isContentPage() ) {
 390                         return false;
 391                 }
 392
 393                 $text = $editInfo ? $editInfo->pst : false;
 394
 395                 if ( $this->isRedirect( $text ) ) {
 396                         return false;
 397                 }
 398
 399                 switch ( $wgArticleCountMethod ) {
 400                 case 'any':
 401                         return true;
 402                 case 'comma':
 403                         if ( $text === false ) {
 404                                 $text = $this->getRawText();
 405                         }
 406                         return strpos( $text,  ',' ) !== false;
 407                 case 'link':
 408                         if ( $editInfo ) {
 409                                 // ParserOutput::getLinks() is a 2D array of page links, so
 410                                 // to be really correct we would need to recurse in the array
 411                                 // but the main array should only have items in it if there are
 412                                 // links.
 413                                 return (bool)count( $editInfo->output->getLinks() );
 414                         } else {
 415                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 416                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 417                         }
 418                 }
 419         }
 420
 421         /**
 422          * Tests if the article text represents a redirect
 423          *
 424          * @param $text mixed string containing article contents, or boolean
 425          * @return bool
 426          */
 427         public function isRedirect( $text = false ) {
 428                 if ( $text === false ) {
 429                         if ( !$this->mDataLoaded ) {
 430                                 $this->loadPageData();
 431                         }
 432
 433                         return (bool)$this->mIsRedirect;
 434                 } else {
 435                         return Title::newFromRedirect( $text ) !== null;
 436                 }
 437         }
 438
 439         /**
 440          * Loads everything except the text
 441          * This isn't necessary for all uses, so it's only done if needed.
 442          */
 443         protected function loadLastEdit() {
 444                 if ( $this->mLastRevision !== null ) {
 445                         return; // already loaded
 446                 }
 447
 448                 # New or non-existent articles have no user information
 449                 $id = $this->getID();
 450                 if ( 0 == $id ) {
 451                         return;
 452                 }
 453
 454                 $revision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 455                 if ( $revision ) {
 456                         $this->setLastEdit( $revision );
 457                 }
 458         }
 459
 460         /**
 461          * Set the latest revision
 462          */
 463         protected function setLastEdit( Revision $revision ) {
 464                 $this->mLastRevision = $revision;
 465                 $this->mTimestamp = $revision->getTimestamp();
 466         }
 467
 468         /**
 469          * Get the latest revision
 470          * @return Revision|false
 471          */
 472         public function getRevision() {
 473                 $this->loadLastEdit();
 474                 if ( $this->mLastRevision ) {
 475                         return $this->mLastRevision;
 476                 }
 477                 return false;
 478         }
 479
 480         /**
 481          * Get the text of the current revision. No side-effects...
 482          *
 483          * @param $audience Integer: one of:
 484          *      Revision::FOR_PUBLIC       to be displayed to all users
 485          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 486          *      Revision::RAW              get the text regardless of permissions
 487          * @return String|false The text of the current revision
 488          */
 489         public function getText( $audience = Revision::FOR_PUBLIC ) {
 490                 $this->loadLastEdit();
 491                 if ( $this->mLastRevision ) {
 492                         return $this->mLastRevision->getText( $audience );
 493                 }
 494                 return false;
 495         }
 496
 497         /**
 498          * Get the text of the current revision. No side-effects...
 499          *
 500          * @return String|false The text of the current revision
 501          */
 502         public function getRawText() {
 503                 $this->loadLastEdit();
 504                 if ( $this->mLastRevision ) {
 505                         return $this->mLastRevision->getRawText();
 506                 }
 507                 return false;
 508         }
 509
 510         /**
 511          * @return string MW timestamp of last article revision
 512          */
 513         public function getTimestamp() {
 514                 // Check if the field has been filled by ParserCache::get()
 515                 if ( !$this->mTimestamp ) {
 516                         $this->loadLastEdit();
 517                 }
 518                 return wfTimestamp( TS_MW, $this->mTimestamp );
 519         }
 520
 521         /**
 522          * Set the page timestamp (use only to avoid DB queries)
 523          * @param $ts string MW timestamp of last article revision
 524          * @return void
 525          */
 526         public function setTimestamp( $ts ) {
 527                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 528         }
 529
 530         /**
 531          * @param $audience Integer: one of:
 532          *      Revision::FOR_PUBLIC       to be displayed to all users
 533          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 534          *      Revision::RAW              get the text regardless of permissions
 535          * @return int user ID for the user that made the last article revision
 536          */
 537         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 538                 $this->loadLastEdit();
 539                 if ( $this->mLastRevision ) {
 540                         return $this->mLastRevision->getUser( $audience );
 541                 } else {
 542                         return -1;
 543                 }
 544         }
 545
 546         /**
 547          * @param $audience Integer: one of:
 548          *      Revision::FOR_PUBLIC       to be displayed to all users
 549          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 550          *      Revision::RAW              get the text regardless of permissions
 551          * @return string username of the user that made the last article revision
 552          */
 553         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 554                 $this->loadLastEdit();
 555                 if ( $this->mLastRevision ) {
 556                         return $this->mLastRevision->getUserText( $audience );
 557                 } else {
 558                         return '';
 559                 }
 560         }
 561
 562         /**
 563          * @param $audience Integer: one of:
 564          *      Revision::FOR_PUBLIC       to be displayed to all users
 565          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 566          *      Revision::RAW              get the text regardless of permissions
 567          * @return string Comment stored for the last article revision
 568          */
 569         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 570                 $this->loadLastEdit();
 571                 if ( $this->mLastRevision ) {
 572                         return $this->mLastRevision->getComment( $audience );
 573                 } else {
 574                         return '';
 575                 }
 576         }
 577
 578         /**
 579          * Returns true if last revision was marked as "minor edit"
 580          *
 581          * @return boolean Minor edit indicator for the last article revision.
 582          */
 583         public function getMinorEdit() {
 584                 $this->loadLastEdit();
 585                 if ( $this->mLastRevision ) {
 586                         return $this->mLastRevision->isMinor();
 587                 } else {
 588                         return false;
 589                 }
 590         }
 591
 592         /**
 593          * Get a list of users who have edited this article, not including the user who made
 594          * the most recent revision, which you can get from $article->getUser() if you want it
 595          * @return UserArrayFromResult
 596          */
 597         public function getContributors() {
 598                 # @todo FIXME: This is expensive; cache this info somewhere.
 599
 600                 $dbr = wfGetDB( DB_SLAVE );
 601
 602                 if ( $dbr->implicitGroupby() ) {
 603                         $realNameField = 'user_real_name';
 604                 } else {
 605                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 606                 }
 607
 608                 $tables = array( 'revision', 'user' );
 609
 610                 $fields = array(
 611                         'rev_user as user_id',
 612                         'rev_user_text AS user_name',
 613                         $realNameField,
 614                         'MAX(rev_timestamp) AS timestamp',
 615                 );
 616
 617                 $conds = array( 'rev_page' => $this->getId() );
 618
 619                 // The user who made the top revision gets credited as "this page was last edited by
 620                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 621                 $user = $this->getUser();
 622                 if ( $user ) {
 623                         $conds[] = "rev_user != $user";
 624                 } else {
 625                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 626                 }
 627
 628                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 629
 630                 $jconds = array(
 631                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 632                 );
 633
 634                 $options = array(
 635                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 636                         'ORDER BY' => 'timestamp DESC',
 637                 );
 638
 639                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 640                 return new UserArrayFromResult( $res );
 641         }
 642
 643         /**
 644          * Should the parser cache be used?
 645          *
 646          * @return boolean
 647          */
 648         public function useParserCache( $oldid ) {
 649                 global $wgUser, $wgEnableParserCache;
 650
 651                 return $wgEnableParserCache
 652                         && $wgUser->getStubThreshold() == 0
 653                         && $this->exists()
 654                         && empty( $oldid )
 655                         && !$this->mTitle->isCssOrJsPage()
 656                         && !$this->mTitle->isCssJsSubpage();
 657         }
 658
 659         /**
 660          * Perform the actions of a page purging
 661          */
 662         public function doPurge() {
 663                 global $wgUseSquid;
 664
 665                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 666                         return false;
 667                 }
 668
 669                 // Invalidate the cache
 670                 $this->mTitle->invalidateCache();
 671                 $this->clear();
 672
 673                 if ( $wgUseSquid ) {
 674                         // Commit the transaction before the purge is sent
 675                         $dbw = wfGetDB( DB_MASTER );
 676                         $dbw->commit();
 677
 678                         // Send purge
 679                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 680                         $update->doUpdate();
 681                 }
 682
 683                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 684                         if ( $this->getID() == 0 ) {
 685                                 $text = false;
 686                         } else {
 687                                 $text = $this->getRawText();
 688                         }
 689
 690                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 691                 }
 692         }
 693
 694         /**
 695          * Insert a new empty page record for this article.
 696          * This *must* be followed up by creating a revision
 697          * and running $this->updateRevisionOn( ... );
 698          * or else the record will be left in a funky state.
 699          * Best if all done inside a transaction.
 700          *
 701          * @param $dbw DatabaseBase
 702          * @return int The newly created page_id key, or false if the title already existed
 703          * @private
 704          */
 705         public function insertOn( $dbw ) {
 706                 wfProfileIn( __METHOD__ );
 707
 708                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 709                 $dbw->insert( 'page', array(
 710                         'page_id'           => $page_id,
 711                         'page_namespace'    => $this->mTitle->getNamespace(),
 712                         'page_title'        => $this->mTitle->getDBkey(),
 713                         'page_counter'      => 0,
 714                         'page_restrictions' => '',
 715                         'page_is_redirect'  => 0, # Will set this shortly...
 716                         'page_is_new'       => 1,
 717                         'page_random'       => wfRandom(),
 718                         'page_touched'      => $dbw->timestamp(),
 719                         'page_latest'       => 0, # Fill this in shortly...
 720                         'page_len'          => 0, # Fill this in shortly...
 721                 ), __METHOD__, 'IGNORE' );
 722
 723                 $affected = $dbw->affectedRows();
 724
 725                 if ( $affected ) {
 726                         $newid = $dbw->insertId();
 727                         $this->mTitle->resetArticleID( $newid );
 728                 }
 729                 wfProfileOut( __METHOD__ );
 730
 731                 return $affected ? $newid : false;
 732         }
 733
 734         /**
 735          * Update the page record to point to a newly saved revision.
 736          *
 737          * @param $dbw DatabaseBase: object
 738          * @param $revision Revision: For ID number, and text used to set
 739                                                 length and redirect status fields
 740          * @param $lastRevision Integer: if given, will not overwrite the page field
 741          *                      when different from the currently set value.
 742          *                      Giving 0 indicates the new page flag should be set
 743          *                      on.
 744          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 745          *                           removing rows in redirect table.
 746          * @return bool true on success, false on failure
 747          * @private
 748          */
 749         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 750                 wfProfileIn( __METHOD__ );
 751
 752                 $text = $revision->getText();
 753                 $rt = Title::newFromRedirectRecurse( $text );
 754
 755                 $conditions = array( 'page_id' => $this->getId() );
 756
 757                 if ( !is_null( $lastRevision ) ) {
 758                         # An extra check against threads stepping on each other
 759                         $conditions['page_latest'] = $lastRevision;
 760                 }
 761
 762                 $dbw->update( 'page',
 763                         array( /* SET */
 764                                 'page_latest'      => $revision->getId(),
 765                                 'page_touched'     => $dbw->timestamp(),
 766                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 767                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 768                                 'page_len'         => strlen( $text ),
 769                         ),
 770                         $conditions,
 771                         __METHOD__ );
 772
 773                 $result = $dbw->affectedRows() != 0;
 774                 if ( $result ) {
 775                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 776                 }
 777
 778                 wfProfileOut( __METHOD__ );
 779                 return $result;
 780         }
 781
 782         /**
 783          * Add row to the redirect table if this is a redirect, remove otherwise.
 784          *
 785          * @param $dbw DatabaseBase
 786          * @param $redirectTitle Title object pointing to the redirect target,
 787          *                       or NULL if this is not a redirect
 788          * @param $lastRevIsRedirect If given, will optimize adding and
 789          *                           removing rows in redirect table.
 790          * @return bool true on success, false on failure
 791          * @private
 792          */
 793         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 794                 // Always update redirects (target link might have changed)
 795                 // Update/Insert if we don't know if the last revision was a redirect or not
 796                 // Delete if changing from redirect to non-redirect
 797                 $isRedirect = !is_null( $redirectTitle );
 798
 799                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 800                         return true;
 801                 }
 802
 803                 wfProfileIn( __METHOD__ );
 804                 if ( $isRedirect ) {
 805                         $this->insertRedirectEntry( $redirectTitle );
 806                 } else {
 807                         // This is not a redirect, remove row from redirect table
 808                         $where = array( 'rd_from' => $this->getId() );
 809                         $dbw->delete( 'redirect', $where, __METHOD__ );
 810                 }
 811
 812                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 813                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 814                 }
 815                 wfProfileOut( __METHOD__ );
 816
 817                 return ( $dbw->affectedRows() != 0 );
 818         }
 819
 820         /**
 821          * If the given revision is newer than the currently set page_latest,
 822          * update the page record. Otherwise, do nothing.
 823          *
 824          * @param $dbw Database object
 825          * @param $revision Revision object
 826          * @return mixed
 827          */
 828         public function updateIfNewerOn( $dbw, $revision ) {
 829                 wfProfileIn( __METHOD__ );
 830
 831                 $row = $dbw->selectRow(
 832                         array( 'revision', 'page' ),
 833                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 834                         array(
 835                                 'page_id' => $this->getId(),
 836                                 'page_latest=rev_id' ),
 837                         __METHOD__ );
 838
 839                 if ( $row ) {
 840                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 841                                 wfProfileOut( __METHOD__ );
 842                                 return false;
 843                         }
 844                         $prev = $row->rev_id;
 845                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 846                 } else {
 847                         # No or missing previous revision; mark the page as new
 848                         $prev = 0;
 849                         $lastRevIsRedirect = null;
 850                 }
 851
 852                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 853
 854                 wfProfileOut( __METHOD__ );
 855                 return $ret;
 856         }
 857
 858         /**
 859          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 860          * @param $text String: new text of the section
 861          * @param $summary String: new section's subject, only if $section is 'new'
 862          * @param $edittime String: revision timestamp or null to use the current revision
 863          * @return string Complete article text, or null if error
 864          */
 865         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 866                 wfProfileIn( __METHOD__ );
 867
 868                 if ( strval( $section ) == '' ) {
 869                         // Whole-page edit; let the whole text through
 870                 } else {
 871                         if ( is_null( $edittime ) ) {
 872                                 $rev = Revision::newFromTitle( $this->mTitle );
 873                         } else {
 874                                 $dbw = wfGetDB( DB_MASTER );
 875                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 876                         }
 877
 878                         if ( !$rev ) {
 879                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 880                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 881                                 wfProfileOut( __METHOD__ );
 882                                 return null;
 883                         }
 884
 885                         $oldtext = $rev->getText();
 886
 887                         if ( $section == 'new' ) {
 888                                 # Inserting a new section
 889                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 890                                 $text = strlen( trim( $oldtext ) ) > 0
 891                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 892                                                 : "{$subject}{$text}";
 893                         } else {
 894                                 # Replacing an existing section; roll out the big guns
 895                                 global $wgParser;
 896
 897                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 898                         }
 899                 }
 900
 901                 wfProfileOut( __METHOD__ );
 902                 return $text;
 903         }
 904
 905         /**
 906          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 907          * @param $flags Int
 908          * @return Int updated $flags
 909          */
 910         function checkFlags( $flags ) {
 911                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
 912                         if ( $this->mTitle->getArticleID() ) {
 913                                 $flags |= EDIT_UPDATE;
 914                         } else {
 915                                 $flags |= EDIT_NEW;
 916                         }
 917                 }
 918
 919                 return $flags;
 920         }
 921
 922         /**
 923          * Change an existing article or create a new article. Updates RC and all necessary caches,
 924          * optionally via the deferred update array.
 925          *
 926          * $wgUser must be set before calling this function.
 927          *
 928          * @param $text String: new text
 929          * @param $summary String: edit summary
 930          * @param $flags Integer bitfield:
 931          *      EDIT_NEW
 932          *          Article is known or assumed to be non-existent, create a new one
 933          *      EDIT_UPDATE
 934          *          Article is known or assumed to be pre-existing, update it
 935          *      EDIT_MINOR
 936          *          Mark this edit minor, if the user is allowed to do so
 937          *      EDIT_SUPPRESS_RC
 938          *          Do not log the change in recentchanges
 939          *      EDIT_FORCE_BOT
 940          *          Mark the edit a "bot" edit regardless of user rights
 941          *      EDIT_DEFER_UPDATES
 942          *          Defer some of the updates until the end of index.php
 943          *      EDIT_AUTOSUMMARY
 944          *          Fill in blank summaries with generated text where possible
 945          *
 946          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
 947          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
 948          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
 949          * edit-already-exists error will be returned. These two conditions are also possible with
 950          * auto-detection due to MediaWiki's performance-optimised locking strategy.
 951          *
 952          * @param $baseRevId the revision ID this edit was based off, if any
 953          * @param $user User (optional), $wgUser will be used if not passed
 954          *
 955          * @return Status object. Possible errors:
 956          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
 957          *     edit-gone-missing:       In update mode, but the article didn't exist
 958          *     edit-conflict:           In update mode, the article changed unexpectedly
 959          *     edit-no-change:          Warning that the text was the same as before
 960          *     edit-already-exists:     In creation mode, but the article already exists
 961          *
 962          *  Extensions may define additional errors.
 963          *
 964          *  $return->value will contain an associative array with members as follows:
 965          *     new:                     Boolean indicating if the function attempted to create a new article
 966          *     revision:                The revision object for the inserted revision, or null
 967          *
 968          *  Compatibility note: this function previously returned a boolean value indicating success/failure
 969          */
 970         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
 971                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
 972
 973                 # Low-level sanity check
 974                 if ( $this->mTitle->getText() === '' ) {
 975                         throw new MWException( 'Something is trying to edit an article with an empty title' );
 976                 }
 977
 978                 wfProfileIn( __METHOD__ );
 979
 980                 $user = is_null( $user ) ? $wgUser : $user;
 981                 $status = Status::newGood( array() );
 982
 983                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
 984                 $this->loadPageData();
 985
 986                 $flags = $this->checkFlags( $flags );
 987
 988                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
 989                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
 990                 {
 991                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
 992
 993                         if ( $status->isOK() ) {
 994                                 $status->fatal( 'edit-hook-aborted' );
 995                         }
 996
 997                         wfProfileOut( __METHOD__ );
 998                         return $status;
 999                 }
1000
1001                 # Silently ignore EDIT_MINOR if not allowed
1002                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1003                 $bot = $flags & EDIT_FORCE_BOT;
1004
1005                 $oldtext = $this->getRawText(); // current revision
1006                 $oldsize = strlen( $oldtext );
1007
1008                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1009                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1010                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1011                 }
1012
1013                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1014                 $text = $editInfo->pst;
1015                 $newsize = strlen( $text );
1016
1017                 $dbw = wfGetDB( DB_MASTER );
1018                 $now = wfTimestampNow();
1019                 $this->mTimestamp = $now;
1020
1021                 if ( $flags & EDIT_UPDATE ) {
1022                         # Update article, but only if changed.
1023                         $status->value['new'] = false;
1024
1025                         # Make sure the revision is either completely inserted or not inserted at all
1026                         if ( !$wgDBtransactions ) {
1027                                 $userAbort = ignore_user_abort( true );
1028                         }
1029
1030                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1031
1032                         if ( $changed ) {
1033                                 if ( !$this->mLatest ) {
1034                                         # Article gone missing
1035                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1036                                         $status->fatal( 'edit-gone-missing' );
1037
1038                                         wfProfileOut( __METHOD__ );
1039                                         return $status;
1040                                 }
1041
1042                                 $revision = new Revision( array(
1043                                         'page'       => $this->getId(),
1044                                         'comment'    => $summary,
1045                                         'minor_edit' => $isminor,
1046                                         'text'       => $text,
1047                                         'parent_id'  => $this->mLatest,
1048                                         'user'       => $user->getId(),
1049                                         'user_text'  => $user->getName(),
1050                                         'timestamp'  => $now
1051                                 ) );
1052
1053                                 $dbw->begin();
1054                                 $revisionId = $revision->insertOn( $dbw );
1055
1056                                 # Update page
1057                                 #
1058                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1059                                 # during the course of this function. This makes sure that EditPage can detect
1060                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1061                                 # before this function is called. A previous function used a separate query, this
1062                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1063                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1064
1065                                 if ( !$ok ) {
1066                                         /* Belated edit conflict! Run away!! */
1067                                         $status->fatal( 'edit-conflict' );
1068
1069                                         # Delete the invalid revision if the DB is not transactional
1070                                         if ( !$wgDBtransactions ) {
1071                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1072                                         }
1073
1074                                         $revisionId = 0;
1075                                         $dbw->rollback();
1076                                 } else {
1077                                         global $wgUseRCPatrol;
1078                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1079                                         # Update recentchanges
1080                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1081                                                 # Mark as patrolled if the user can do so
1082                                                 $patrolled = $wgUseRCPatrol && !count(
1083                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1084                                                 # Add RC row to the DB
1085                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1086                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1087                                                         $revisionId, $patrolled
1088                                                 );
1089
1090                                                 # Log auto-patrolled edits
1091                                                 if ( $patrolled ) {
1092                                                         PatrolLog::record( $rc, true );
1093                                                 }
1094                                         }
1095                                         $user->incEditCount();
1096                                         $dbw->commit();
1097                                 }
1098                         } else {
1099                                 $status->warning( 'edit-no-change' );
1100                                 $revision = null;
1101                                 // Keep the same revision ID, but do some updates on it
1102                                 $revisionId = $this->getLatest();
1103                                 // Update page_touched, this is usually implicit in the page update
1104                                 // Other cache updates are done in onArticleEdit()
1105                                 $this->mTitle->invalidateCache();
1106                         }
1107
1108                         if ( !$wgDBtransactions ) {
1109                                 ignore_user_abort( $userAbort );
1110                         }
1111
1112                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1113                         if ( !$status->isOK() ) {
1114                                 wfProfileOut( __METHOD__ );
1115                                 return $status;
1116                         }
1117
1118                         # Invalidate cache of this article and all pages using this article
1119                         # as a template. Partly deferred.
1120                         self::onArticleEdit( $this->mTitle );
1121                         # Update links tables, site stats, etc.
1122                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed, $user );
1123                 } else {
1124                         # Create new article
1125                         $status->value['new'] = true;
1126
1127                         $dbw->begin();
1128
1129                         # Add the page record; stake our claim on this title!
1130                         # This will return false if the article already exists
1131                         $newid = $this->insertOn( $dbw );
1132
1133                         if ( $newid === false ) {
1134                                 $dbw->rollback();
1135                                 $status->fatal( 'edit-already-exists' );
1136
1137                                 wfProfileOut( __METHOD__ );
1138                                 return $status;
1139                         }
1140
1141                         # Save the revision text...
1142                         $revision = new Revision( array(
1143                                 'page'       => $newid,
1144                                 'comment'    => $summary,
1145                                 'minor_edit' => $isminor,
1146                                 'text'       => $text,
1147                                 'user'       => $user->getId(),
1148                                 'user_text'  => $user->getName(),
1149                                 'timestamp'  => $now
1150                         ) );
1151                         $revisionId = $revision->insertOn( $dbw );
1152
1153                         $this->mTitle->resetArticleID( $newid );
1154                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1155                         # @todo FIXME?
1156                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1157
1158                         # Update the page record with revision data
1159                         $this->updateRevisionOn( $dbw, $revision, 0 );
1160
1161                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1162
1163                         # Update recentchanges
1164                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1165                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1166
1167                                 # Mark as patrolled if the user can do so
1168                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1169                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1170                                 # Add RC row to the DB
1171                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1172                                         '', strlen( $text ), $revisionId, $patrolled );
1173
1174                                 # Log auto-patrolled edits
1175                                 if ( $patrolled ) {
1176                                         PatrolLog::record( $rc, true );
1177                                 }
1178                         }
1179                         $user->incEditCount();
1180                         $dbw->commit();
1181
1182                         # Update links, etc.
1183                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true, $user, true );
1184
1185                         # Clear caches
1186                         self::onArticleCreate( $this->mTitle );
1187
1188                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1189                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1190                 }
1191
1192                 # Do updates right now unless deferral was requested
1193                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1194                         wfDoUpdates();
1195                 }
1196
1197                 // Return the new revision (or null) to the caller
1198                 $status->value['revision'] = $revision;
1199
1200                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1201                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1202
1203                 # Promote user to any groups they meet the criteria for
1204                 $user->addAutopromoteOnceGroups( 'onEdit' );
1205
1206                 wfProfileOut( __METHOD__ );
1207                 return $status;
1208         }
1209
1210         /**
1211          * Update the article's restriction field, and leave a log entry.
1212          *
1213          * @param $limit Array: set of restriction keys
1214          * @param $reason String
1215          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1216          * @param $expiry Array: per restriction type expiration
1217          * @return bool true on success
1218          */
1219         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1220                 global $wgUser, $wgContLang;
1221
1222                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1223
1224                 $id = $this->mTitle->getArticleID();
1225
1226                 if ( $id <= 0 ) {
1227                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1228                         return false;
1229                 }
1230
1231                 if ( wfReadOnly() ) {
1232                         wfDebug( "updateRestrictions failed: read-only\n" );
1233                         return false;
1234                 }
1235
1236                 if ( !$this->mTitle->userCan( 'protect' ) ) {
1237                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1238                         return false;
1239                 }
1240
1241                 if ( !$cascade ) {
1242                         $cascade = false;
1243                 }
1244
1245                 // Take this opportunity to purge out expired restrictions
1246                 Title::purgeExpiredRestrictions();
1247
1248                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1249                 # we expect a single selection, but the schema allows otherwise.
1250                 $current = array();
1251                 $updated = self::flattenRestrictions( $limit );
1252                 $changed = false;
1253
1254                 foreach ( $restrictionTypes as $action ) {
1255                         if ( isset( $expiry[$action] ) ) {
1256                                 # Get current restrictions on $action
1257                                 $aLimits = $this->mTitle->getRestrictions( $action );
1258                                 $current[$action] = implode( '', $aLimits );
1259                                 # Are any actual restrictions being dealt with here?
1260                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1261
1262                                 # If something changed, we need to log it. Checking $aRChanged
1263                                 # assures that "unprotecting" a page that is not protected does
1264                                 # not log just because the expiry was "changed".
1265                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1266                                         $changed = true;
1267                                 }
1268                         }
1269                 }
1270
1271                 $current = self::flattenRestrictions( $current );
1272
1273                 $changed = ( $changed || $current != $updated );
1274                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1275                 $protect = ( $updated != '' );
1276
1277                 # If nothing's changed, do nothing
1278                 if ( $changed ) {
1279                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1280                                 $dbw = wfGetDB( DB_MASTER );
1281
1282                                 # Prepare a null revision to be added to the history
1283                                 $modified = $current != '' && $protect;
1284
1285                                 if ( $protect ) {
1286                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1287                                 } else {
1288                                         $comment_type = 'unprotectedarticle';
1289                                 }
1290
1291                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1292
1293                                 # Only restrictions with the 'protect' right can cascade...
1294                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1295                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1296
1297                                 # The schema allows multiple restrictions
1298                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1299                                         $cascade = false;
1300                                 }
1301
1302                                 $cascade_description = '';
1303
1304                                 if ( $cascade ) {
1305                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1306                                 }
1307
1308                                 if ( $reason ) {
1309                                         $comment .= ": $reason";
1310                                 }
1311
1312                                 $editComment = $comment;
1313                                 $encodedExpiry = array();
1314                                 $protect_description = '';
1315                                 foreach ( $limit as $action => $restrictions ) {
1316                                         if ( !isset( $expiry[$action] ) )
1317                                                 $expiry[$action] = $dbw->getInfinity();
1318
1319                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1320                                         if ( $restrictions != '' ) {
1321                                                 $protect_description .= "[$action=$restrictions] (";
1322                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1323                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1324                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1325                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1326                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1327                                                 } else {
1328                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1329                                                 }
1330
1331                                                 $protect_description .= ') ';
1332                                         }
1333                                 }
1334                                 $protect_description = trim( $protect_description );
1335
1336                                 if ( $protect_description && $protect ) {
1337                                         $editComment .= " ($protect_description)";
1338                                 }
1339
1340                                 if ( $cascade ) {
1341                                         $editComment .= "$cascade_description";
1342                                 }
1343
1344                                 # Update restrictions table
1345                                 foreach ( $limit as $action => $restrictions ) {
1346                                         if ( $restrictions != '' ) {
1347                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1348                                                         array( 'pr_page' => $id,
1349                                                                 'pr_type' => $action,
1350                                                                 'pr_level' => $restrictions,
1351                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1352                                                                 'pr_expiry' => $encodedExpiry[$action]
1353                                                         ),
1354                                                         __METHOD__
1355                                                 );
1356                                         } else {
1357                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1358                                                         'pr_type' => $action ), __METHOD__ );
1359                                         }
1360                                 }
1361
1362                                 # Insert a null revision
1363                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1364                                 $nullRevId = $nullRevision->insertOn( $dbw );
1365
1366                                 $latest = $this->getLatest();
1367                                 # Update page record
1368                                 $dbw->update( 'page',
1369                                         array( /* SET */
1370                                                 'page_touched' => $dbw->timestamp(),
1371                                                 'page_restrictions' => '',
1372                                                 'page_latest' => $nullRevId
1373                                         ), array( /* WHERE */
1374                                                 'page_id' => $id
1375                                         ), __METHOD__
1376                                 );
1377
1378                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
1379                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1380
1381                                 # Update the protection log
1382                                 $log = new LogPage( 'protect' );
1383                                 if ( $protect ) {
1384                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1385                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1386                                 } else {
1387                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1388                                 }
1389                         } # End hook
1390                 } # End "changed" check
1391
1392                 return true;
1393         }
1394
1395         /**
1396          * Take an array of page restrictions and flatten it to a string
1397          * suitable for insertion into the page_restrictions field.
1398          * @param $limit Array
1399          * @return String
1400          */
1401         protected static function flattenRestrictions( $limit ) {
1402                 if ( !is_array( $limit ) ) {
1403                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1404                 }
1405
1406                 $bits = array();
1407                 ksort( $limit );
1408
1409                 foreach ( $limit as $action => $restrictions ) {
1410                         if ( $restrictions != '' ) {
1411                                 $bits[] = "$action=$restrictions";
1412                         }
1413                 }
1414
1415                 return implode( ':', $bits );
1416         }
1417
1418         /**
1419          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1420          */
1421         public function isBigDeletion() {
1422                 global $wgDeleteRevisionsLimit;
1423
1424                 if ( $wgDeleteRevisionsLimit ) {
1425                         $revCount = $this->estimateRevisionCount();
1426
1427                         return $revCount > $wgDeleteRevisionsLimit;
1428                 }
1429
1430                 return false;
1431         }
1432
1433         /**
1434          * @return int approximate revision count
1435          */
1436         public function estimateRevisionCount() {
1437                 $dbr = wfGetDB( DB_SLAVE );
1438
1439                 // For an exact count...
1440                 // return $dbr->selectField( 'revision', 'COUNT(*)',
1441                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
1442                 return $dbr->estimateRowCount( 'revision', '*',
1443                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1444         }
1445
1446         /**
1447          * Get the last N authors
1448          * @param $num Integer: number of revisions to get
1449          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1450          * @return array Array of authors, duplicates not removed
1451          */
1452         public function getLastNAuthors( $num, $revLatest = 0 ) {
1453                 wfProfileIn( __METHOD__ );
1454                 // First try the slave
1455                 // If that doesn't have the latest revision, try the master
1456                 $continue = 2;
1457                 $db = wfGetDB( DB_SLAVE );
1458
1459                 do {
1460                         $res = $db->select( array( 'page', 'revision' ),
1461                                 array( 'rev_id', 'rev_user_text' ),
1462                                 array(
1463                                         'page_namespace' => $this->mTitle->getNamespace(),
1464                                         'page_title' => $this->mTitle->getDBkey(),
1465                                         'rev_page = page_id'
1466                                 ), __METHOD__,
1467                                 array(
1468                                         'ORDER BY' => 'rev_timestamp DESC',
1469                                         'LIMIT' => $num
1470                                 )
1471                         );
1472
1473                         if ( !$res ) {
1474                                 wfProfileOut( __METHOD__ );
1475                                 return array();
1476                         }
1477
1478                         $row = $db->fetchObject( $res );
1479
1480                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1481                                 $db = wfGetDB( DB_MASTER );
1482                                 $continue--;
1483                         } else {
1484                                 $continue = 0;
1485                         }
1486                 } while ( $continue );
1487
1488                 $authors = array( $row->rev_user_text );
1489
1490                 foreach ( $res as $row ) {
1491                         $authors[] = $row->rev_user_text;
1492                 }
1493
1494                 wfProfileOut( __METHOD__ );
1495                 return $authors;
1496         }
1497
1498         /**
1499          * Back-end article deletion
1500          * Deletes the article with database consistency, writes logs, purges caches
1501          *
1502          * @param $reason string delete reason for deletion log
1503          * @param suppress bitfield
1504          *      Revision::DELETED_TEXT
1505          *      Revision::DELETED_COMMENT
1506          *      Revision::DELETED_USER
1507          *      Revision::DELETED_RESTRICTED
1508          * @param $id int article ID
1509          * @param $commit boolean defaults to true, triggers transaction end
1510          * @return boolean true if successful
1511          */
1512         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
1513                 global $wgDeferredUpdateList, $wgUseTrackbacks;
1514                 global $wgUser;
1515
1516                 wfDebug( __METHOD__ . "\n" );
1517
1518                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
1519                         return false;
1520                 }
1521                 $dbw = wfGetDB( DB_MASTER );
1522                 $t = $this->mTitle->getDBkey();
1523                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1524
1525                 if ( $t === '' || $id == 0 ) {
1526                         return false;
1527                 }
1528
1529                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 );
1530                 array_push( $wgDeferredUpdateList, $u );
1531
1532                 // Bitfields to further suppress the content
1533                 if ( $suppress ) {
1534                         $bitfield = 0;
1535                         // This should be 15...
1536                         $bitfield |= Revision::DELETED_TEXT;
1537                         $bitfield |= Revision::DELETED_COMMENT;
1538                         $bitfield |= Revision::DELETED_USER;
1539                         $bitfield |= Revision::DELETED_RESTRICTED;
1540                 } else {
1541                         $bitfield = 'rev_deleted';
1542                 }
1543
1544                 $dbw->begin();
1545                 // For now, shunt the revision data into the archive table.
1546                 // Text is *not* removed from the text table; bulk storage
1547                 // is left intact to avoid breaking block-compression or
1548                 // immutable storage schemes.
1549                 //
1550                 // For backwards compatibility, note that some older archive
1551                 // table entries will have ar_text and ar_flags fields still.
1552                 //
1553                 // In the future, we may keep revisions and mark them with
1554                 // the rev_deleted field, which is reserved for this purpose.
1555                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1556                         array(
1557                                 'ar_namespace'  => 'page_namespace',
1558                                 'ar_title'      => 'page_title',
1559                                 'ar_comment'    => 'rev_comment',
1560                                 'ar_user'       => 'rev_user',
1561                                 'ar_user_text'  => 'rev_user_text',
1562                                 'ar_timestamp'  => 'rev_timestamp',
1563                                 'ar_minor_edit' => 'rev_minor_edit',
1564                                 'ar_rev_id'     => 'rev_id',
1565                                 'ar_text_id'    => 'rev_text_id',
1566                                 'ar_text'       => '\'\'', // Be explicit to appease
1567                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1568                                 'ar_len'        => 'rev_len',
1569                                 'ar_page_id'    => 'page_id',
1570                                 'ar_deleted'    => $bitfield
1571                         ), array(
1572                                 'page_id' => $id,
1573                                 'page_id = rev_page'
1574                         ), __METHOD__
1575                 );
1576
1577                 # Delete restrictions for it
1578                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1579
1580                 # Now that it's safely backed up, delete it
1581                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1582                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1583
1584                 if ( !$ok ) {
1585                         $dbw->rollback();
1586                         return false;
1587                 }
1588
1589                 # Fix category table counts
1590                 $cats = array();
1591                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1592
1593                 foreach ( $res as $row ) {
1594                         $cats [] = $row->cl_to;
1595                 }
1596
1597                 $this->updateCategoryCounts( array(), $cats );
1598
1599                 # If using cascading deletes, we can skip some explicit deletes
1600                 if ( !$dbw->cascadingDeletes() ) {
1601                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1602
1603                         if ( $wgUseTrackbacks )
1604                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1605
1606                         # Delete outgoing links
1607                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1608                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
1609                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
1610                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
1611                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
1612                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
1613                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ) );
1614                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
1615                 }
1616
1617                 # If using cleanup triggers, we can skip some manual deletes
1618                 if ( !$dbw->cleanupTriggers() ) {
1619                         # Clean up recentchanges entries...
1620                         $dbw->delete( 'recentchanges',
1621                                 array( 'rc_type != ' . RC_LOG,
1622                                         'rc_namespace' => $this->mTitle->getNamespace(),
1623                                         'rc_title' => $this->mTitle->getDBkey() ),
1624                                 __METHOD__ );
1625                         $dbw->delete( 'recentchanges',
1626                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1627                                 __METHOD__ );
1628                 }
1629
1630                 # Clear caches
1631                 self::onArticleDelete( $this->mTitle );
1632
1633                 # Clear the cached article id so the interface doesn't act like we exist
1634                 $this->mTitle->resetArticleID( 0 );
1635
1636                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1637                 $logtype = $suppress ? 'suppress' : 'delete';
1638                 $log = new LogPage( $logtype );
1639
1640                 # Make sure logging got through
1641                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
1642
1643                 if ( $commit ) {
1644                         $dbw->commit();
1645                 }
1646
1647                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
1648                 return true;
1649         }
1650
1651         /**
1652          * Roll back the most recent consecutive set of edits to a page
1653          * from the same user; fails if there are no eligible edits to
1654          * roll back to, e.g. user is the sole contributor. This function
1655          * performs permissions checks on $wgUser, then calls commitRollback()
1656          * to do the dirty work
1657          *
1658          * @param $fromP String: Name of the user whose edits to rollback.
1659          * @param $summary String: Custom summary. Set to default summary if empty.
1660          * @param $token String: Rollback token.
1661          * @param $bot Boolean: If true, mark all reverted edits as bot.
1662          *
1663          * @param $resultDetails Array: contains result-specific array of additional values
1664          *    'alreadyrolled' : 'current' (rev)
1665          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1666          *
1667          * @return array of errors, each error formatted as
1668          *   array(messagekey, param1, param2, ...).
1669          * On success, the array is empty.  This array can also be passed to
1670          * OutputPage::showPermissionsErrorPage().
1671          */
1672         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
1673                 global $wgUser;
1674
1675                 $resultDetails = null;
1676
1677                 # Check permissions
1678                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1679                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
1680                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1681
1682                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1683                         $errors[] = array( 'sessionfailure' );
1684                 }
1685
1686                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
1687                         $errors[] = array( 'actionthrottledtext' );
1688                 }
1689
1690                 # If there were errors, bail out now
1691                 if ( !empty( $errors ) ) {
1692                         return $errors;
1693                 }
1694
1695                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
1696         }
1697
1698         /**
1699          * Backend implementation of doRollback(), please refer there for parameter
1700          * and return value documentation
1701          *
1702          * NOTE: This function does NOT check ANY permissions, it just commits the
1703          * rollback to the DB Therefore, you should only call this function direct-
1704          * ly if you want to use custom permissions checks. If you don't, use
1705          * doRollback() instead.
1706          */
1707         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
1708                 global $wgUseRCPatrol, $wgUser, $wgContLang;
1709
1710                 $dbw = wfGetDB( DB_MASTER );
1711
1712                 if ( wfReadOnly() ) {
1713                         return array( array( 'readonlytext' ) );
1714                 }
1715
1716                 # Get the last editor
1717                 $current = Revision::newFromTitle( $this->mTitle );
1718                 if ( is_null( $current ) ) {
1719                         # Something wrong... no page?
1720                         return array( array( 'notanarticle' ) );
1721                 }
1722
1723                 $from = str_replace( '_', ' ', $fromP );
1724                 # User name given should match up with the top revision.
1725                 # If the user was deleted then $from should be empty.
1726                 if ( $from != $current->getUserText() ) {
1727                         $resultDetails = array( 'current' => $current );
1728                         return array( array( 'alreadyrolled',
1729                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1730                                 htmlspecialchars( $fromP ),
1731                                 htmlspecialchars( $current->getUserText() )
1732                         ) );
1733                 }
1734
1735                 # Get the last edit not by this guy...
1736                 # Note: these may not be public values
1737                 $user = intval( $current->getRawUser() );
1738                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1739                 $s = $dbw->selectRow( 'revision',
1740                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1741                         array( 'rev_page' => $current->getPage(),
1742                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1743                         ), __METHOD__,
1744                         array( 'USE INDEX' => 'page_timestamp',
1745                                 'ORDER BY' => 'rev_timestamp DESC' )
1746                         );
1747                 if ( $s === false ) {
1748                         # No one else ever edited this page
1749                         return array( array( 'cantrollback' ) );
1750                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1751                         # Only admins can see this text
1752                         return array( array( 'notvisiblerev' ) );
1753                 }
1754
1755                 $set = array();
1756                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
1757                         # Mark all reverted edits as bot
1758                         $set['rc_bot'] = 1;
1759                 }
1760
1761                 if ( $wgUseRCPatrol ) {
1762                         # Mark all reverted edits as patrolled
1763                         $set['rc_patrolled'] = 1;
1764                 }
1765
1766                 if ( count( $set ) ) {
1767                         $dbw->update( 'recentchanges', $set,
1768                                 array( /* WHERE */
1769                                         'rc_cur_id' => $current->getPage(),
1770                                         'rc_user_text' => $current->getUserText(),
1771                                         "rc_timestamp > '{$s->rev_timestamp}'",
1772                                 ), __METHOD__
1773                         );
1774                 }
1775
1776                 # Generate the edit summary if necessary
1777                 $target = Revision::newFromId( $s->rev_id );
1778                 if ( empty( $summary ) ) {
1779                         if ( $from == '' ) { // no public user name
1780                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1781                         } else {
1782                                 $summary = wfMsgForContent( 'revertpage' );
1783                         }
1784                 }
1785
1786                 # Allow the custom summary to use the same args as the default message
1787                 $args = array(
1788                         $target->getUserText(), $from, $s->rev_id,
1789                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1790                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1791                 );
1792                 $summary = wfMsgReplaceArgs( $summary, $args );
1793
1794                 # Save
1795                 $flags = EDIT_UPDATE;
1796
1797                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
1798                         $flags |= EDIT_MINOR;
1799                 }
1800
1801                 if ( $bot && ( $wgUser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1802                         $flags |= EDIT_FORCE_BOT;
1803                 }
1804
1805                 # Actually store the edit
1806                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1807                 if ( !empty( $status->value['revision'] ) ) {
1808                         $revId = $status->value['revision']->getId();
1809                 } else {
1810                         $revId = false;
1811                 }
1812
1813                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
1814
1815                 $resultDetails = array(
1816                         'summary' => $summary,
1817                         'current' => $current,
1818                         'target'  => $target,
1819                         'newid'   => $revId
1820                 );
1821
1822                 return array();
1823         }
1824
1825         /**
1826          * Do standard deferred updates after page view
1827          */
1828         public function viewUpdates() {
1829                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
1830                 if ( wfReadOnly() ) {
1831                         return;
1832                 }
1833
1834                 # Don't update page view counters on views from bot users (bug 14044)
1835                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
1836                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
1837                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
1838                 }
1839
1840                 # Update newtalk / watchlist notification status
1841                 $wgUser->clearNotification( $this->mTitle );
1842         }
1843
1844         /**
1845          * Prepare text which is about to be saved.
1846          * Returns a stdclass with source, pst and output members
1847          */
1848         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1849                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
1850                         // Already prepared
1851                         return $this->mPreparedEdit;
1852                 }
1853
1854                 global $wgParser;
1855
1856                 if( $user === null ) {
1857                         global $wgUser;
1858                         $user = $wgUser;
1859                 }
1860                 $popts = ParserOptions::newFromUser( $user );
1861                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1862
1863                 $edit = (object)array();
1864                 $edit->revid = $revid;
1865                 $edit->newText = $text;
1866                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1867                 $edit->popts = $this->getParserOptions( true );
1868                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1869                 $edit->oldText = $this->getRawText();
1870
1871                 $this->mPreparedEdit = $edit;
1872
1873                 return $edit;
1874         }
1875
1876         /**
1877          * Do standard deferred updates after page edit.
1878          * Update links tables, site stats, search index and message cache.
1879          * Purges pages that include this page if the text was changed here.
1880          * Every 100th edit, prune the recent changes table.
1881          *
1882          * @private
1883          * @param $text String: New text of the article
1884          * @param $summary String: Edit summary
1885          * @param $minoredit Boolean: Minor edit
1886          * @param $timestamp_of_pagechange String timestamp associated with the page change
1887          * @param $newid Integer: rev_id value of the new revision
1888          * @param $changed Boolean: Whether or not the content actually changed
1889          * @param $user User object: User doing the edit
1890          * @param $created Boolean: Whether the edit created the page
1891          */
1892         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid,
1893                 $changed = true, User $user = null, $created = false )
1894         {
1895                 global $wgDeferredUpdateList, $wgUser, $wgEnableParserCache;
1896
1897                 wfProfileIn( __METHOD__ );
1898
1899                 # Parse the text
1900                 # Be careful not to double-PST: $text is usually already PST-ed once
1901                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1902                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1903                         $editInfo = $this->prepareTextForEdit( $text, $newid, $user );
1904                 } else {
1905                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1906                         $editInfo = $this->mPreparedEdit;
1907                 }
1908
1909                 # Save it to the parser cache
1910                 if ( $wgEnableParserCache ) {
1911                         $parserCache = ParserCache::singleton();
1912                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1913                 }
1914
1915                 # Update the links tables
1916                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1917                 $u->doUpdate();
1918
1919                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
1920
1921                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1922                         if ( 0 == mt_rand( 0, 99 ) ) {
1923                                 // Flush old entries from the `recentchanges` table; we do this on
1924                                 // random requests so as to avoid an increase in writes for no good reason
1925                                 global $wgRCMaxAge;
1926
1927                                 $dbw = wfGetDB( DB_MASTER );
1928                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1929                                 $dbw->delete(
1930                                         'recentchanges',
1931                                         array( "rc_timestamp < '$cutoff'" ),
1932                                         __METHOD__
1933                                 );
1934                         }
1935                 }
1936
1937                 $id = $this->getID();
1938                 $title = $this->mTitle->getPrefixedDBkey();
1939                 $shortTitle = $this->mTitle->getDBkey();
1940
1941                 if ( 0 == $id ) {
1942                         wfProfileOut( __METHOD__ );
1943                         return;
1944                 }
1945
1946                 if ( !$changed ) {
1947                         $good = 0;
1948                         $total = 0;
1949                 } elseif ( $created ) {
1950                         $good = (int)$this->isCountable( $editInfo );
1951                         $total = 1;
1952                 } else {
1953                         $good = (int)$this->isCountable( $editInfo ) - (int)$this->isCountable();
1954                         $total = 0;
1955                 }
1956
1957                 $wgDeferredUpdateList[] = new SiteStatsUpdate( 0, 1, $good, $total );
1958                 $wgDeferredUpdateList[] = new SearchUpdate( $id, $title, $text );
1959
1960                 # If this is another user's talk page, update newtalk
1961                 # Don't do this if $changed = false otherwise some idiot can null-edit a
1962                 # load of user talk pages and piss people off, nor if it's a minor edit
1963                 # by a properly-flagged bot.
1964                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
1965                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
1966                 ) {
1967                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1968                                 $other = User::newFromName( $shortTitle, false );
1969                                 if ( !$other ) {
1970                                         wfDebug( __METHOD__ . ": invalid username\n" );
1971                                 } elseif ( User::isIP( $shortTitle ) ) {
1972                                         // An anonymous user
1973                                         $other->setNewtalk( true );
1974                                 } elseif ( $other->isLoggedIn() ) {
1975                                         $other->setNewtalk( true );
1976                                 } else {
1977                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1978                                 }
1979                         }
1980                 }
1981
1982                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1983                         MessageCache::singleton()->replace( $shortTitle, $text );
1984                 }
1985
1986                 wfProfileOut( __METHOD__ );
1987         }
1988
1989         /**
1990          * Perform article updates on a special page creation.
1991          *
1992          * @param $rev Revision object
1993          *
1994          * @todo This is a shitty interface function. Kill it and replace the
1995          * other shitty functions like editUpdates and such so it's not needed
1996          * anymore.
1997          */
1998         public function createUpdates( $rev ) {
1999                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2000                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true, null, true );
2001         }
2002
2003         /**
2004          * This function is called right before saving the wikitext,
2005          * so we can do things like signatures and links-in-context.
2006          *
2007          * @param $text String article contents
2008          * @param $user User object: user doing the edit, $wgUser will be used if
2009          *              null is given
2010          * @param $popts ParserOptions object: parser options, default options for
2011          *               the user loaded if null given
2012          * @return string article contents with altered wikitext markup (signatures
2013          *      converted, {{subst:}}, templates, etc.)
2014          */
2015         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2016                 global $wgParser;
2017
2018                 if ( $user === null ) {
2019                         global $wgUser;
2020                         $user = $wgUser;
2021                 }
2022
2023                 if ( $popts === null ) {
2024                         $popts = ParserOptions::newFromUser( $user );
2025                 }
2026
2027                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2028         }
2029
2030         /**
2031          * Loads page_touched and returns a value indicating if it should be used
2032          * @return boolean true if not a redirect
2033          */
2034         public function checkTouched() {
2035                 if ( !$this->mDataLoaded ) {
2036                         $this->loadPageData();
2037                 }
2038
2039                 return !$this->mIsRedirect;
2040         }
2041
2042         /**
2043          * Get the page_touched field
2044          * @return string containing GMT timestamp
2045          */
2046         public function getTouched() {
2047                 if ( !$this->mDataLoaded ) {
2048                         $this->loadPageData();
2049                 }
2050
2051                 return $this->mTouched;
2052         }
2053
2054         /**
2055          * Get the page_latest field
2056          * @return integer rev_id of current revision
2057          */
2058         public function getLatest() {
2059                 if ( !$this->mDataLoaded ) {
2060                         $this->loadPageData();
2061                 }
2062
2063                 return (int)$this->mLatest;
2064         }
2065
2066         /**
2067          * Edit an article without doing all that other stuff
2068          * The article must already exist; link tables etc
2069          * are not updated, caches are not flushed.
2070          *
2071          * @param $text String: text submitted
2072          * @param $comment String: comment submitted
2073          * @param $minor Boolean: whereas it's a minor modification
2074          */
2075         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2076                 wfProfileIn( __METHOD__ );
2077
2078                 $dbw = wfGetDB( DB_MASTER );
2079                 $revision = new Revision( array(
2080                         'page'       => $this->getId(),
2081                         'text'       => $text,
2082                         'comment'    => $comment,
2083                         'minor_edit' => $minor ? 1 : 0,
2084                         ) );
2085                 $revision->insertOn( $dbw );
2086                 $this->updateRevisionOn( $dbw, $revision );
2087
2088                 global $wgUser;
2089                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
2090
2091                 wfProfileOut( __METHOD__ );
2092         }
2093
2094         /**
2095          * The onArticle*() functions are supposed to be a kind of hooks
2096          * which should be called whenever any of the specified actions
2097          * are done.
2098          *
2099          * This is a good place to put code to clear caches, for instance.
2100          *
2101          * This is called on page move and undelete, as well as edit
2102          *
2103          * @param $title Title object
2104          */
2105         public static function onArticleCreate( $title ) {
2106                 # Update existence markers on article/talk tabs...
2107                 if ( $title->isTalkPage() ) {
2108                         $other = $title->getSubjectPage();
2109                 } else {
2110                         $other = $title->getTalkPage();
2111                 }
2112
2113                 $other->invalidateCache();
2114                 $other->purgeSquid();
2115
2116                 $title->touchLinks();
2117                 $title->purgeSquid();
2118                 $title->deleteTitleProtection();
2119         }
2120
2121         /**
2122          * Clears caches when article is deleted
2123          *
2124          * @param $title Title
2125          */
2126         public static function onArticleDelete( $title ) {
2127                 # Update existence markers on article/talk tabs...
2128                 if ( $title->isTalkPage() ) {
2129                         $other = $title->getSubjectPage();
2130                 } else {
2131                         $other = $title->getTalkPage();
2132                 }
2133
2134                 $other->invalidateCache();
2135                 $other->purgeSquid();
2136
2137                 $title->touchLinks();
2138                 $title->purgeSquid();
2139
2140                 # File cache
2141                 HTMLFileCache::clearFileCache( $title );
2142
2143                 # Messages
2144                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2145                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2146                 }
2147
2148                 # Images
2149                 if ( $title->getNamespace() == NS_FILE ) {
2150                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2151                         $update->doUpdate();
2152                 }
2153
2154                 # User talk pages
2155                 if ( $title->getNamespace() == NS_USER_TALK ) {
2156                         $user = User::newFromName( $title->getText(), false );
2157                         $user->setNewtalk( false );
2158                 }
2159
2160                 # Image redirects
2161                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2162         }
2163
2164         /**
2165          * Purge caches on page update etc
2166          *
2167          * @param $title Title object
2168          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2169          */
2170         public static function onArticleEdit( $title ) {
2171                 global $wgDeferredUpdateList;
2172
2173                 // Invalidate caches of articles which include this page
2174                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
2175
2176                 // Invalidate the caches of all pages which redirect here
2177                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
2178
2179                 # Purge squid for this page only
2180                 $title->purgeSquid();
2181
2182                 # Clear file cache for this page only
2183                 HTMLFileCache::clearFileCache( $title );
2184         }
2185
2186         /**#@-*/
2187
2188         /**
2189          * Return a list of templates used by this article.
2190          * Uses the templatelinks table
2191          *
2192          * @return Array of Title objects
2193          */
2194         public function getUsedTemplates() {
2195                 $result = array();
2196                 $id = $this->mTitle->getArticleID();
2197
2198                 if ( $id == 0 ) {
2199                         return array();
2200                 }
2201
2202                 $dbr = wfGetDB( DB_SLAVE );
2203                 $res = $dbr->select( array( 'templatelinks' ),
2204                         array( 'tl_namespace', 'tl_title' ),
2205                         array( 'tl_from' => $id ),
2206                         __METHOD__ );
2207
2208                 if ( $res !== false ) {
2209                         foreach ( $res as $row ) {
2210                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2211                         }
2212                 }
2213
2214                 return $result;
2215         }
2216
2217         /**
2218          * Returns a list of hidden categories this page is a member of.
2219          * Uses the page_props and categorylinks tables.
2220          *
2221          * @return Array of Title objects
2222          */
2223         public function getHiddenCategories() {
2224                 $result = array();
2225                 $id = $this->mTitle->getArticleID();
2226
2227                 if ( $id == 0 ) {
2228                         return array();
2229                 }
2230
2231                 $dbr = wfGetDB( DB_SLAVE );
2232                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2233                         array( 'cl_to' ),
2234                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2235                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2236                         __METHOD__ );
2237
2238                 if ( $res !== false ) {
2239                         foreach ( $res as $row ) {
2240                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2241                         }
2242                 }
2243
2244                 return $result;
2245         }
2246
2247         /**
2248         * Return an applicable autosummary if one exists for the given edit.
2249         * @param $oldtext String: the previous text of the page.
2250         * @param $newtext String: The submitted text of the page.
2251         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2252         * @return string An appropriate autosummary, or an empty string.
2253         */
2254         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2255                 global $wgContLang;
2256
2257                 # Decide what kind of autosummary is needed.
2258
2259                 # Redirect autosummaries
2260                 $ot = Title::newFromRedirect( $oldtext );
2261                 $rt = Title::newFromRedirect( $newtext );
2262
2263                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2264                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
2265                 }
2266
2267                 # New page autosummaries
2268                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2269                         # If they're making a new article, give its text, truncated, in the summary.
2270
2271                         $truncatedtext = $wgContLang->truncate(
2272                                 str_replace( "\n", ' ', $newtext ),
2273                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2274
2275                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2276                 }
2277
2278                 # Blanking autosummaries
2279                 if ( $oldtext != '' && $newtext == '' ) {
2280                         return wfMsgForContent( 'autosumm-blank' );
2281                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2282                         # Removing more than 90% of the article
2283
2284                         $truncatedtext = $wgContLang->truncate(
2285                                 $newtext,
2286                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2287
2288                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2289                 }
2290
2291                 # If we reach this point, there's no applicable autosummary for our case, so our
2292                 # autosummary is empty.
2293                 return '';
2294         }
2295
2296         /**
2297          * Get parser options suitable for rendering the primary article wikitext
2298          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
2299          * @return mixed ParserOptions object or boolean false
2300          */
2301         public function getParserOptions( $canonical = false ) {
2302                 global $wgUser, $wgLanguageCode;
2303
2304                 if ( !$this->mParserOptions || $canonical ) {
2305                         $user = !$canonical ? $wgUser : new User;
2306                         $parserOptions = new ParserOptions( $user );
2307                         $parserOptions->setTidy( true );
2308                         $parserOptions->enableLimitReport();
2309
2310                         if ( $canonical ) {
2311                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
2312                                 return $parserOptions;
2313                         }
2314                         $this->mParserOptions = $parserOptions;
2315                 }
2316                 // Clone to allow modifications of the return value without affecting cache
2317                 return clone $this->mParserOptions;
2318         }
2319
2320         /**
2321         * Get parser options suitable for rendering the primary article wikitext
2322         * @param User $user
2323         * @return ParserOptions
2324         */
2325         public function makeParserOptions( User $user ) {
2326                 $options = ParserOptions::newFromUser( $user );
2327                 $options->enableLimitReport(); // show inclusion/loop reports
2328                 $options->setTidy( true ); // fix bad HTML
2329                 return $options;
2330         }
2331
2332         /**
2333          * Update all the appropriate counts in the category table, given that
2334          * we've added the categories $added and deleted the categories $deleted.
2335          *
2336          * @param $added array   The names of categories that were added
2337          * @param $deleted array The names of categories that were deleted
2338          */
2339         public function updateCategoryCounts( $added, $deleted ) {
2340                 $ns = $this->mTitle->getNamespace();
2341                 $dbw = wfGetDB( DB_MASTER );
2342
2343                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2344                 # exist, we might legitimately not create it, but it's simpler to just
2345                 # create it and then give it a negative value, since the value is bogus
2346                 # anyway.
2347                 #
2348                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2349                 $insertCats = array_merge( $added, $deleted );
2350                 if ( !$insertCats ) {
2351                         # Okay, nothing to do
2352                         return;
2353                 }
2354
2355                 $insertRows = array();
2356
2357                 foreach ( $insertCats as $cat ) {
2358                         $insertRows[] = array(
2359                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2360                                 'cat_title' => $cat
2361                         );
2362                 }
2363                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2364
2365                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2366                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2367
2368                 if ( $ns == NS_CATEGORY ) {
2369                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2370                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2371                 } elseif ( $ns == NS_FILE ) {
2372                         $addFields[]    = 'cat_files = cat_files + 1';
2373                         $removeFields[] = 'cat_files = cat_files - 1';
2374                 }
2375
2376                 if ( $added ) {
2377                         $dbw->update(
2378                                 'category',
2379                                 $addFields,
2380                                 array( 'cat_title' => $added ),
2381                                 __METHOD__
2382                         );
2383                 }
2384
2385                 if ( $deleted ) {
2386                         $dbw->update(
2387                                 'category',
2388                                 $removeFields,
2389                                 array( 'cat_title' => $deleted ),
2390                                 __METHOD__
2391                         );
2392                 }
2393         }
2394
2395         /**
2396          * Lightweight method to get the parser output for a page, checking the parser cache
2397          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
2398          * consider, so it's not appropriate to use there.
2399          *
2400          * @since 1.16 (r52326) for LiquidThreads
2401          *
2402          * @param $oldid mixed integer Revision ID or null
2403          * @return ParserOutput or false if the given revsion ID is not found
2404          */
2405         public function getParserOutput( $oldid = null ) {
2406                 global $wgEnableParserCache, $wgUser;
2407
2408                 // Should the parser cache be used?
2409                 $useParserCache = $wgEnableParserCache &&
2410                         $wgUser->getStubThreshold() == 0 &&
2411                         $this->exists() &&
2412                         $oldid === null;
2413
2414                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
2415
2416                 if ( $wgUser->getStubThreshold() ) {
2417                         wfIncrStats( 'pcache_miss_stub' );
2418                 }
2419
2420                 if ( $useParserCache ) {
2421                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
2422                         if ( $parserOutput !== false ) {
2423                                 return $parserOutput;
2424                         }
2425                 }
2426
2427                 // Cache miss; parse and output it.
2428                 if ( $oldid === null ) {
2429                         $text = $this->getRawText();
2430                 } else {
2431                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
2432                         if ( $rev === null ) {
2433                                 return false;
2434                         }
2435                         $text = $rev->getText();
2436                 }
2437
2438                 return $this->getOutputFromWikitext( $text, $useParserCache );
2439         }
2440 }