includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         /**
  17          * @var Title
  18          * @protected
  19          */
  20         public $mTitle = null;
  21
  22         /**@{{
  23          * @protected
  24          */
  25         public $mCounter = -1;               // !< Integer (-1 means "not loaded")
  26         public $mDataLoaded = false;         // !< Boolean
  27         public $mIsRedirect = false;         // !< Boolean
  28         public $mLatest = false;             // !< Boolean
  29         public $mPreparedEdit = false;           // !< Array
  30         public $mRedirectTarget = null;          // !< Title object
  31         public $mLastRevision = null;            // !< Revision object
  32         public $mTimestamp = '';             // !< String
  33         public $mTouched = '19700101000000'; // !< String
  34         /**@}}*/
  35
  36         /**
  37          * @protected
  38          * @var ParserOptions: ParserOptions object for $wgUser articles
  39          */
  40         public $mParserOptions;
  41
  42         /**
  43          * Constructor and clear the article
  44          * @param $title Title Reference to a Title object.
  45          */
  46         public function __construct( Title $title ) {
  47                 $this->mTitle = $title;
  48         }
  49
  50         /**
  51          * Constructor from a page id
  52          *
  53          * Always override this for all subclasses (until we use PHP with LSB)
  54          *
  55          * @param $id Int article ID to load
  56          */
  57         public static function newFromID( $id ) {
  58                 $t = Title::newFromID( $id );
  59                 # @todo FIXME: Doesn't inherit right
  60                 return $t == null ? null : new self( $t );
  61                 # return $t == null ? null : new static( $t ); // PHP 5.3
  62         }
  63
  64         /**
  65          * Returns overrides for action handlers.
  66          * Classes listed here will be used instead of the default one when
  67          * (and only when) $wgActions[$action] === true. This allows subclasses
  68          * to override the default behavior.
  69          *
  70          * @return Array
  71          */
  72         public function getActionOverrides() {
  73                 return array();
  74         }
  75
  76         /**
  77          * If this page is a redirect, get its target
  78          *
  79          * The target will be fetched from the redirect table if possible.
  80          * If this page doesn't have an entry there, call insertRedirect()
  81          * @return Title|mixed object, or null if this page is not a redirect
  82          */
  83         public function getRedirectTarget() {
  84                 if ( !$this->mTitle->isRedirect() ) {
  85                         return null;
  86                 }
  87
  88                 if ( $this->mRedirectTarget !== null ) {
  89                         return $this->mRedirectTarget;
  90                 }
  91
  92                 # Query the redirect table
  93                 $dbr = wfGetDB( DB_SLAVE );
  94                 $row = $dbr->selectRow( 'redirect',
  95                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  96                         array( 'rd_from' => $this->getId() ),
  97                         __METHOD__
  98                 );
  99
 100                 // rd_fragment and rd_interwiki were added later, populate them if empty
 101                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 102                         return $this->mRedirectTarget = Title::makeTitle(
 103                                 $row->rd_namespace, $row->rd_title,
 104                                 $row->rd_fragment, $row->rd_interwiki );
 105                 }
 106
 107                 # This page doesn't have an entry in the redirect table
 108                 return $this->mRedirectTarget = $this->insertRedirect();
 109         }
 110
 111         /**
 112          * Insert an entry for this page into the redirect table.
 113          *
 114          * Don't call this function directly unless you know what you're doing.
 115          * @return Title object or null if not a redirect
 116          */
 117         public function insertRedirect() {
 118                 // recurse through to only get the final target
 119                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 120                 if ( !$retval ) {
 121                         return null;
 122                 }
 123                 $this->insertRedirectEntry( $retval );
 124                 return $retval;
 125         }
 126
 127         /**
 128          * Insert or update the redirect table entry for this page to indicate
 129          * it redirects to $rt .
 130          * @param $rt Title redirect target
 131          */
 132         public function insertRedirectEntry( $rt ) {
 133                 $dbw = wfGetDB( DB_MASTER );
 134                 $dbw->replace( 'redirect', array( 'rd_from' ),
 135                         array(
 136                                 'rd_from'               => $this->getId(),
 137                                 'rd_namespace'  => $rt->getNamespace(),
 138                                 'rd_title'              => $rt->getDBkey(),
 139                                 'rd_fragment'   => $rt->getFragment(),
 140                                 'rd_interwiki'  => $rt->getInterwiki(),
 141                         ),
 142                         __METHOD__
 143                 );
 144         }
 145
 146         /**
 147          * Get the Title object or URL this page redirects to
 148          *
 149          * @return mixed false, Title of in-wiki target, or string with URL
 150          */
 151         public function followRedirect() {
 152                 return $this->getRedirectURL( $this->getRedirectTarget() );
 153         }
 154
 155         /**
 156          * Get the Title object or URL to use for a redirect. We use Title
 157          * objects for same-wiki, non-special redirects and URLs for everything
 158          * else.
 159          * @param $rt Title Redirect target
 160          * @return mixed false, Title object of local target, or string with URL
 161          */
 162         public function getRedirectURL( $rt ) {
 163                 if ( $rt ) {
 164                         if ( $rt->getInterwiki() != '' ) {
 165                                 if ( $rt->isLocal() ) {
 166                                         // Offsite wikis need an HTTP redirect.
 167                                         //
 168                                         // This can be hard to reverse and may produce loops,
 169                                         // so they may be disabled in the site configuration.
 170                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 171                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 172                                 }
 173                         } else {
 174                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 175                                         // Gotta handle redirects to special pages differently:
 176                                         // Fill the HTTP response "Location" header and ignore
 177                                         // the rest of the page we're on.
 178                                         //
 179                                         // This can be hard to reverse, so they may be disabled.
 180                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 181                                                 // rolleyes
 182                                         } else {
 183                                                 return $rt->getFullURL();
 184                                         }
 185                                 }
 186
 187                                 return $rt;
 188                         }
 189                 }
 190
 191                 // No or invalid redirect
 192                 return false;
 193         }
 194
 195         /**
 196          * Get the title object of the article
 197          * @return Title object of this page
 198          */
 199         public function getTitle() {
 200                 return $this->mTitle;
 201         }
 202
 203         /**
 204          * Clear the object
 205          */
 206         public function clear() {
 207                 $this->mDataLoaded = false;
 208
 209                 $this->mCounter = -1; # Not loaded
 210                 $this->mRedirectTarget = null; # Title object if set
 211                 $this->mLastRevision = null; # Latest revision
 212                 $this->mTimestamp = '';
 213                 $this->mTouched = '19700101000000';
 214                 $this->mIsRedirect = false;
 215                 $this->mLatest = false;
 216                 $this->mPreparedEdit = false;
 217         }
 218
 219         /**
 220          * Get the text that needs to be saved in order to undo all revisions
 221          * between $undo and $undoafter. Revisions must belong to the same page,
 222          * must exist and must not be deleted
 223          * @param $undo Revision
 224          * @param $undoafter Revision Must be an earlier revision than $undo
 225          * @return mixed string on success, false on failure
 226          */
 227         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 228                 $cur_text = $this->getRawText();
 229                 if ( $cur_text === false ) {
 230                         return false; // no page
 231                 }
 232                 $undo_text = $undo->getText();
 233                 $undoafter_text = $undoafter->getText();
 234
 235                 if ( $cur_text == $undo_text ) {
 236                         # No use doing a merge if it's just a straight revert.
 237                         return $undoafter_text;
 238                 }
 239
 240                 $undone_text = '';
 241
 242                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 243                         return false;
 244                 }
 245
 246                 return $undone_text;
 247         }
 248
 249         /**
 250          * Return the list of revision fields that should be selected to create
 251          * a new page.
 252          */
 253         public static function selectFields() {
 254                 return array(
 255                         'page_id',
 256                         'page_namespace',
 257                         'page_title',
 258                         'page_restrictions',
 259                         'page_counter',
 260                         'page_is_redirect',
 261                         'page_is_new',
 262                         'page_random',
 263                         'page_touched',
 264                         'page_latest',
 265                         'page_len',
 266                 );
 267         }
 268
 269         /**
 270          * Fetch a page record with the given conditions
 271          * @param $dbr DatabaseBase object
 272          * @param $conditions Array
 273          * @return mixed Database result resource, or false on failure
 274          */
 275         protected function pageData( $dbr, $conditions ) {
 276                 $fields = self::selectFields();
 277
 278                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 279
 280                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 281
 282                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 283
 284                 return $row;
 285         }
 286
 287         /**
 288          * Fetch a page record matching the Title object's namespace and title
 289          * using a sanitized title string
 290          *
 291          * @param $dbr DatabaseBase object
 292          * @param $title Title object
 293          * @return mixed Database result resource, or false on failure
 294          */
 295         public function pageDataFromTitle( $dbr, $title ) {
 296                 return $this->pageData( $dbr, array(
 297                         'page_namespace' => $title->getNamespace(),
 298                         'page_title'     => $title->getDBkey() ) );
 299         }
 300
 301         /**
 302          * Fetch a page record matching the requested ID
 303          *
 304          * @param $dbr DatabaseBase
 305          * @param $id Integer
 306          * @return mixed Database result resource, or false on failure
 307          */
 308         public function pageDataFromId( $dbr, $id ) {
 309                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 310         }
 311
 312         /**
 313          * Set the general counter, title etc data loaded from
 314          * some source.
 315          *
 316          * @param $data Object|String $res->fetchObject() object or the string "fromdb" to reload
 317          */
 318         public function loadPageData( $data = 'fromdb' ) {
 319                 if ( $data === 'fromdb' ) {
 320                         $dbr = wfGetDB( DB_SLAVE );
 321                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 322                 }
 323
 324                 $lc = LinkCache::singleton();
 325
 326                 if ( $data ) {
 327                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 328
 329                         $this->mTitle->loadFromRow( $data );
 330
 331                         # Old-fashioned restrictions
 332                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 333
 334                         $this->mCounter     = intval( $data->page_counter );
 335                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 336                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 337                         $this->mLatest      = intval( $data->page_latest );
 338                 } else {
 339                         $lc->addBadLinkObj( $this->mTitle );
 340
 341                         $this->mTitle->loadFromRow( false );
 342                 }
 343
 344                 $this->mDataLoaded = true;
 345         }
 346
 347         /**
 348          * @return int Page ID
 349          */
 350         public function getId() {
 351                 return $this->mTitle->getArticleID();
 352         }
 353
 354         /**
 355          * @return bool Whether or not the page exists in the database
 356          */
 357         public function exists() {
 358                 return $this->getId() > 0;
 359         }
 360
 361         /**
 362          * Check if this page is something we're going to be showing
 363          * some sort of sensible content for. If we return false, page
 364          * views (plain action=view) will return an HTTP 404 response,
 365          * so spiders and robots can know they're following a bad link.
 366          *
 367          * @return bool
 368          */
 369         public function hasViewableContent() {
 370                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 371         }
 372
 373         /**
 374          * @return int The view count for the page
 375          */
 376         public function getCount() {
 377                 if ( -1 == $this->mCounter ) {
 378                         $id = $this->getId();
 379
 380                         if ( $id == 0 ) {
 381                                 $this->mCounter = 0;
 382                         } else {
 383                                 $dbr = wfGetDB( DB_SLAVE );
 384                                 $this->mCounter = $dbr->selectField( 'page',
 385                                         'page_counter',
 386                                         array( 'page_id' => $id ),
 387                                         __METHOD__
 388                                 );
 389                         }
 390                 }
 391
 392                 return $this->mCounter;
 393         }
 394
 395         /**
 396          * Determine whether a page would be suitable for being counted as an
 397          * article in the site_stats table based on the title & its content
 398          *
 399          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 400          *        if false, the current database state will be used
 401          * @return Boolean
 402          */
 403         public function isCountable( $editInfo = false ) {
 404                 global $wgArticleCountMethod;
 405
 406                 if ( !$this->mTitle->isContentPage() ) {
 407                         return false;
 408                 }
 409
 410                 $text = $editInfo ? $editInfo->pst : false;
 411
 412                 if ( $this->isRedirect( $text ) ) {
 413                         return false;
 414                 }
 415
 416                 switch ( $wgArticleCountMethod ) {
 417                 case 'any':
 418                         return true;
 419                 case 'comma':
 420                         if ( $text === false ) {
 421                                 $text = $this->getRawText();
 422                         }
 423                         return strpos( $text,  ',' ) !== false;
 424                 case 'link':
 425                         if ( $editInfo ) {
 426                                 // ParserOutput::getLinks() is a 2D array of page links, so
 427                                 // to be really correct we would need to recurse in the array
 428                                 // but the main array should only have items in it if there are
 429                                 // links.
 430                                 return (bool)count( $editInfo->output->getLinks() );
 431                         } else {
 432                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 433                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 434                         }
 435                 }
 436         }
 437
 438         /**
 439          * Tests if the article text represents a redirect
 440          *
 441          * @param $text mixed string containing article contents, or boolean
 442          * @return bool
 443          */
 444         public function isRedirect( $text = false ) {
 445                 if ( $text === false ) {
 446                         if ( !$this->mDataLoaded ) {
 447                                 $this->loadPageData();
 448                         }
 449
 450                         return (bool)$this->mIsRedirect;
 451                 } else {
 452                         return Title::newFromRedirect( $text ) !== null;
 453                 }
 454         }
 455
 456         /**
 457          * Loads everything except the text
 458          * This isn't necessary for all uses, so it's only done if needed.
 459          */
 460         protected function loadLastEdit() {
 461                 if ( $this->mLastRevision !== null ) {
 462                         return; // already loaded
 463                 }
 464
 465                 $latest = $this->getLatest();
 466                 if ( !$latest ) {
 467                         return; // page doesn't exist or is missing page_latest info
 468                 }
 469
 470                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 471                 if ( $revision ) { // sanity
 472                         $this->setLastEdit( $revision );
 473                 }
 474         }
 475
 476         /**
 477          * Set the latest revision
 478          */
 479         protected function setLastEdit( Revision $revision ) {
 480                 $this->mLastRevision = $revision;
 481                 $this->mTimestamp = $revision->getTimestamp();
 482         }
 483
 484         /**
 485          * Get the latest revision
 486          * @return Revision|null
 487          */
 488         public function getRevision() {
 489                 $this->loadLastEdit();
 490                 if ( $this->mLastRevision ) {
 491                         return $this->mLastRevision;
 492                 }
 493                 return null;
 494         }
 495
 496         /**
 497          * Get the text of the current revision. No side-effects...
 498          *
 499          * @param $audience Integer: one of:
 500          *      Revision::FOR_PUBLIC       to be displayed to all users
 501          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 502          *      Revision::RAW              get the text regardless of permissions
 503          * @return String|false The text of the current revision
 504          */
 505         public function getText( $audience = Revision::FOR_PUBLIC ) {
 506                 $this->loadLastEdit();
 507                 if ( $this->mLastRevision ) {
 508                         return $this->mLastRevision->getText( $audience );
 509                 }
 510                 return false;
 511         }
 512
 513         /**
 514          * Get the text of the current revision. No side-effects...
 515          *
 516          * @return String|false The text of the current revision
 517          */
 518         public function getRawText() {
 519                 $this->loadLastEdit();
 520                 if ( $this->mLastRevision ) {
 521                         return $this->mLastRevision->getRawText();
 522                 }
 523                 return false;
 524         }
 525
 526         /**
 527          * @return string MW timestamp of last article revision
 528          */
 529         public function getTimestamp() {
 530                 // Check if the field has been filled by ParserCache::get()
 531                 if ( !$this->mTimestamp ) {
 532                         $this->loadLastEdit();
 533                 }
 534                 return wfTimestamp( TS_MW, $this->mTimestamp );
 535         }
 536
 537         /**
 538          * Set the page timestamp (use only to avoid DB queries)
 539          * @param $ts string MW timestamp of last article revision
 540          * @return void
 541          */
 542         public function setTimestamp( $ts ) {
 543                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 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 int user ID for the user that made the last article revision
 552          */
 553         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 554                 $this->loadLastEdit();
 555                 if ( $this->mLastRevision ) {
 556                         return $this->mLastRevision->getUser( $audience );
 557                 } else {
 558                         return -1;
 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 username of the user that made the last article revision
 568          */
 569         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 570                 $this->loadLastEdit();
 571                 if ( $this->mLastRevision ) {
 572                         return $this->mLastRevision->getUserText( $audience );
 573                 } else {
 574                         return '';
 575                 }
 576         }
 577
 578         /**
 579          * @param $audience Integer: one of:
 580          *      Revision::FOR_PUBLIC       to be displayed to all users
 581          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 582          *      Revision::RAW              get the text regardless of permissions
 583          * @return string Comment stored for the last article revision
 584          */
 585         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 586                 $this->loadLastEdit();
 587                 if ( $this->mLastRevision ) {
 588                         return $this->mLastRevision->getComment( $audience );
 589                 } else {
 590                         return '';
 591                 }
 592         }
 593
 594         /**
 595          * Returns true if last revision was marked as "minor edit"
 596          *
 597          * @return boolean Minor edit indicator for the last article revision.
 598          */
 599         public function getMinorEdit() {
 600                 $this->loadLastEdit();
 601                 if ( $this->mLastRevision ) {
 602                         return $this->mLastRevision->isMinor();
 603                 } else {
 604                         return false;
 605                 }
 606         }
 607
 608         /**
 609          * Get a list of users who have edited this article, not including the user who made
 610          * the most recent revision, which you can get from $article->getUser() if you want it
 611          * @return UserArrayFromResult
 612          */
 613         public function getContributors() {
 614                 # @todo FIXME: This is expensive; cache this info somewhere.
 615
 616                 $dbr = wfGetDB( DB_SLAVE );
 617
 618                 if ( $dbr->implicitGroupby() ) {
 619                         $realNameField = 'user_real_name';
 620                 } else {
 621                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 622                 }
 623
 624                 $tables = array( 'revision', 'user' );
 625
 626                 $fields = array(
 627                         'rev_user as user_id',
 628                         'rev_user_text AS user_name',
 629                         $realNameField,
 630                         'MAX(rev_timestamp) AS timestamp',
 631                 );
 632
 633                 $conds = array( 'rev_page' => $this->getId() );
 634
 635                 // The user who made the top revision gets credited as "this page was last edited by
 636                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 637                 $user = $this->getUser();
 638                 if ( $user ) {
 639                         $conds[] = "rev_user != $user";
 640                 } else {
 641                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 642                 }
 643
 644                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 645
 646                 $jconds = array(
 647                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 648                 );
 649
 650                 $options = array(
 651                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 652                         'ORDER BY' => 'timestamp DESC',
 653                 );
 654
 655                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 656                 return new UserArrayFromResult( $res );
 657         }
 658
 659         /**
 660          * Should the parser cache be used?
 661          *
 662          * @param $user User The relevant user
 663          * @return boolean
 664          */
 665         public function isParserCacheUsed( User $user, $oldid ) {
 666                 global $wgEnableParserCache;
 667
 668                 return $wgEnableParserCache
 669                         && $user->getStubThreshold() == 0
 670                         && $this->exists()
 671                         && empty( $oldid )
 672                         && !$this->mTitle->isCssOrJsPage()
 673                         && !$this->mTitle->isCssJsSubpage();
 674         }
 675
 676         /**
 677          * Perform the actions of a page purging
 678          */
 679         public function doPurge() {
 680                 global $wgUseSquid;
 681
 682                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 683                         return false;
 684                 }
 685
 686                 // Invalidate the cache
 687                 $this->mTitle->invalidateCache();
 688                 $this->clear();
 689
 690                 if ( $wgUseSquid ) {
 691                         // Commit the transaction before the purge is sent
 692                         $dbw = wfGetDB( DB_MASTER );
 693                         $dbw->commit();
 694
 695                         // Send purge
 696                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 697                         $update->doUpdate();
 698                 }
 699
 700                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 701                         if ( $this->getId() == 0 ) {
 702                                 $text = false;
 703                         } else {
 704                                 $text = $this->getRawText();
 705                         }
 706
 707                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 708                 }
 709         }
 710
 711         /**
 712          * Insert a new empty page record for this article.
 713          * This *must* be followed up by creating a revision
 714          * and running $this->updateRevisionOn( ... );
 715          * or else the record will be left in a funky state.
 716          * Best if all done inside a transaction.
 717          *
 718          * @param $dbw DatabaseBase
 719          * @return int The newly created page_id key, or false if the title already existed
 720          * @private
 721          */
 722         public function insertOn( $dbw ) {
 723                 wfProfileIn( __METHOD__ );
 724
 725                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 726                 $dbw->insert( 'page', array(
 727                         'page_id'           => $page_id,
 728                         'page_namespace'    => $this->mTitle->getNamespace(),
 729                         'page_title'        => $this->mTitle->getDBkey(),
 730                         'page_counter'      => 0,
 731                         'page_restrictions' => '',
 732                         'page_is_redirect'  => 0, # Will set this shortly...
 733                         'page_is_new'       => 1,
 734                         'page_random'       => wfRandom(),
 735                         'page_touched'      => $dbw->timestamp(),
 736                         'page_latest'       => 0, # Fill this in shortly...
 737                         'page_len'          => 0, # Fill this in shortly...
 738                 ), __METHOD__, 'IGNORE' );
 739
 740                 $affected = $dbw->affectedRows();
 741
 742                 if ( $affected ) {
 743                         $newid = $dbw->insertId();
 744                         $this->mTitle->resetArticleID( $newid );
 745                 }
 746                 wfProfileOut( __METHOD__ );
 747
 748                 return $affected ? $newid : false;
 749         }
 750
 751         /**
 752          * Update the page record to point to a newly saved revision.
 753          *
 754          * @param $dbw DatabaseBase: object
 755          * @param $revision Revision: For ID number, and text used to set
 756                                                 length and redirect status fields
 757          * @param $lastRevision Integer: if given, will not overwrite the page field
 758          *                      when different from the currently set value.
 759          *                      Giving 0 indicates the new page flag should be set
 760          *                      on.
 761          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 762          *                           removing rows in redirect table.
 763          * @return bool true on success, false on failure
 764          * @private
 765          */
 766         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 767                 wfProfileIn( __METHOD__ );
 768
 769                 $text = $revision->getText();
 770                 $rt = Title::newFromRedirectRecurse( $text );
 771
 772                 $conditions = array( 'page_id' => $this->getId() );
 773
 774                 if ( !is_null( $lastRevision ) ) {
 775                         # An extra check against threads stepping on each other
 776                         $conditions['page_latest'] = $lastRevision;
 777                 }
 778
 779                 $dbw->update( 'page',
 780                         array( /* SET */
 781                                 'page_latest'      => $revision->getId(),
 782                                 'page_touched'     => $dbw->timestamp(),
 783                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 784                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 785                                 'page_len'         => strlen( $text ),
 786                         ),
 787                         $conditions,
 788                         __METHOD__ );
 789
 790                 $result = $dbw->affectedRows() != 0;
 791                 if ( $result ) {
 792                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 793                 }
 794
 795                 wfProfileOut( __METHOD__ );
 796                 return $result;
 797         }
 798
 799         /**
 800          * Add row to the redirect table if this is a redirect, remove otherwise.
 801          *
 802          * @param $dbw DatabaseBase
 803          * @param $redirectTitle Title object pointing to the redirect target,
 804          *                       or NULL if this is not a redirect
 805          * @param $lastRevIsRedirect If given, will optimize adding and
 806          *                           removing rows in redirect table.
 807          * @return bool true on success, false on failure
 808          * @private
 809          */
 810         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 811                 // Always update redirects (target link might have changed)
 812                 // Update/Insert if we don't know if the last revision was a redirect or not
 813                 // Delete if changing from redirect to non-redirect
 814                 $isRedirect = !is_null( $redirectTitle );
 815
 816                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 817                         return true;
 818                 }
 819
 820                 wfProfileIn( __METHOD__ );
 821                 if ( $isRedirect ) {
 822                         $this->insertRedirectEntry( $redirectTitle );
 823                 } else {
 824                         // This is not a redirect, remove row from redirect table
 825                         $where = array( 'rd_from' => $this->getId() );
 826                         $dbw->delete( 'redirect', $where, __METHOD__ );
 827                 }
 828
 829                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 830                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 831                 }
 832                 wfProfileOut( __METHOD__ );
 833
 834                 return ( $dbw->affectedRows() != 0 );
 835         }
 836
 837         /**
 838          * If the given revision is newer than the currently set page_latest,
 839          * update the page record. Otherwise, do nothing.
 840          *
 841          * @param $dbw Database object
 842          * @param $revision Revision object
 843          * @return mixed
 844          */
 845         public function updateIfNewerOn( $dbw, $revision ) {
 846                 wfProfileIn( __METHOD__ );
 847
 848                 $row = $dbw->selectRow(
 849                         array( 'revision', 'page' ),
 850                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 851                         array(
 852                                 'page_id' => $this->getId(),
 853                                 'page_latest=rev_id' ),
 854                         __METHOD__ );
 855
 856                 if ( $row ) {
 857                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 858                                 wfProfileOut( __METHOD__ );
 859                                 return false;
 860                         }
 861                         $prev = $row->rev_id;
 862                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 863                 } else {
 864                         # No or missing previous revision; mark the page as new
 865                         $prev = 0;
 866                         $lastRevIsRedirect = null;
 867                 }
 868
 869                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 870
 871                 wfProfileOut( __METHOD__ );
 872                 return $ret;
 873         }
 874
 875         /**
 876          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 877          * @param $text String: new text of the section
 878          * @param $summary String: new section's subject, only if $section is 'new'
 879          * @param $edittime String: revision timestamp or null to use the current revision
 880          * @return string Complete article text, or null if error
 881          */
 882         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 883                 wfProfileIn( __METHOD__ );
 884
 885                 if ( strval( $section ) == '' ) {
 886                         // Whole-page edit; let the whole text through
 887                 } else {
 888                         if ( is_null( $edittime ) ) {
 889                                 $rev = Revision::newFromTitle( $this->mTitle );
 890                         } else {
 891                                 $dbw = wfGetDB( DB_MASTER );
 892                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 893                         }
 894
 895                         if ( !$rev ) {
 896                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 897                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 898                                 wfProfileOut( __METHOD__ );
 899                                 return null;
 900                         }
 901
 902                         $oldtext = $rev->getText();
 903
 904                         if ( $section == 'new' ) {
 905                                 # Inserting a new section
 906                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 907                                 $text = strlen( trim( $oldtext ) ) > 0
 908                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 909                                                 : "{$subject}{$text}";
 910                         } else {
 911                                 # Replacing an existing section; roll out the big guns
 912                                 global $wgParser;
 913
 914                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 915                         }
 916                 }
 917
 918                 wfProfileOut( __METHOD__ );
 919                 return $text;
 920         }
 921
 922         /**
 923          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 924          * @param $flags Int
 925          * @return Int updated $flags
 926          */
 927         function checkFlags( $flags ) {
 928                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
 929                         if ( $this->mTitle->getArticleID() ) {
 930                                 $flags |= EDIT_UPDATE;
 931                         } else {
 932                                 $flags |= EDIT_NEW;
 933                         }
 934                 }
 935
 936                 return $flags;
 937         }
 938
 939         /**
 940          * Change an existing article or create a new article. Updates RC and all necessary caches,
 941          * optionally via the deferred update array.
 942          *
 943          * @param $text String: new text
 944          * @param $summary String: edit summary
 945          * @param $flags Integer bitfield:
 946          *      EDIT_NEW
 947          *          Article is known or assumed to be non-existent, create a new one
 948          *      EDIT_UPDATE
 949          *          Article is known or assumed to be pre-existing, update it
 950          *      EDIT_MINOR
 951          *          Mark this edit minor, if the user is allowed to do so
 952          *      EDIT_SUPPRESS_RC
 953          *          Do not log the change in recentchanges
 954          *      EDIT_FORCE_BOT
 955          *          Mark the edit a "bot" edit regardless of user rights
 956          *      EDIT_DEFER_UPDATES
 957          *          Defer some of the updates until the end of index.php
 958          *      EDIT_AUTOSUMMARY
 959          *          Fill in blank summaries with generated text where possible
 960          *
 961          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
 962          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
 963          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
 964          * edit-already-exists error will be returned. These two conditions are also possible with
 965          * auto-detection due to MediaWiki's performance-optimised locking strategy.
 966          *
 967          * @param $baseRevId the revision ID this edit was based off, if any
 968          * @param $user User the user doing the edit
 969          *
 970          * @return Status object. Possible errors:
 971          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
 972          *     edit-gone-missing:       In update mode, but the article didn't exist
 973          *     edit-conflict:           In update mode, the article changed unexpectedly
 974          *     edit-no-change:          Warning that the text was the same as before
 975          *     edit-already-exists:     In creation mode, but the article already exists
 976          *
 977          *  Extensions may define additional errors.
 978          *
 979          *  $return->value will contain an associative array with members as follows:
 980          *     new:                     Boolean indicating if the function attempted to create a new article
 981          *     revision:                The revision object for the inserted revision, or null
 982          *
 983          *  Compatibility note: this function previously returned a boolean value indicating success/failure
 984          */
 985         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
 986                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
 987
 988                 # Low-level sanity check
 989                 if ( $this->mTitle->getText() === '' ) {
 990                         throw new MWException( 'Something is trying to edit an article with an empty title' );
 991                 }
 992
 993                 wfProfileIn( __METHOD__ );
 994
 995                 $user = is_null( $user ) ? $wgUser : $user;
 996                 $status = Status::newGood( array() );
 997
 998                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
 999                 $this->loadPageData();
1000
1001                 $flags = $this->checkFlags( $flags );
1002
1003                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1004                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1005                 {
1006                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1007
1008                         if ( $status->isOK() ) {
1009                                 $status->fatal( 'edit-hook-aborted' );
1010                         }
1011
1012                         wfProfileOut( __METHOD__ );
1013                         return $status;
1014                 }
1015
1016                 # Silently ignore EDIT_MINOR if not allowed
1017                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1018                 $bot = $flags & EDIT_FORCE_BOT;
1019
1020                 $oldtext = $this->getRawText(); // current revision
1021                 $oldsize = strlen( $oldtext );
1022                 $oldcountable = $this->isCountable();
1023
1024                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1025                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1026                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1027                 }
1028
1029                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1030                 $text = $editInfo->pst;
1031                 $newsize = strlen( $text );
1032
1033                 $dbw = wfGetDB( DB_MASTER );
1034                 $now = wfTimestampNow();
1035                 $this->mTimestamp = $now;
1036
1037                 if ( $flags & EDIT_UPDATE ) {
1038                         # Update article, but only if changed.
1039                         $status->value['new'] = false;
1040
1041                         # Make sure the revision is either completely inserted or not inserted at all
1042                         if ( !$wgDBtransactions ) {
1043                                 $userAbort = ignore_user_abort( true );
1044                         }
1045
1046                         $revision = new Revision( array(
1047                                 'page'       => $this->getId(),
1048                                 'comment'    => $summary,
1049                                 'minor_edit' => $isminor,
1050                                 'text'       => $text,
1051                                 'parent_id'  => $this->mLatest,
1052                                 'user'       => $user->getId(),
1053                                 'user_text'  => $user->getName(),
1054                                 'timestamp'  => $now
1055                         ) );
1056
1057                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1058
1059                         if ( $changed ) {
1060                                 if ( !$this->mLatest ) {
1061                                         # Article gone missing
1062                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1063                                         $status->fatal( 'edit-gone-missing' );
1064
1065                                         wfProfileOut( __METHOD__ );
1066                                         return $status;
1067                                 }
1068
1069                                 $dbw->begin();
1070                                 $revisionId = $revision->insertOn( $dbw );
1071
1072                                 # Update page
1073                                 #
1074                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1075                                 # during the course of this function. This makes sure that EditPage can detect
1076                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1077                                 # before this function is called. A previous function used a separate query, this
1078                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1079                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1080
1081                                 if ( !$ok ) {
1082                                         /* Belated edit conflict! Run away!! */
1083                                         $status->fatal( 'edit-conflict' );
1084
1085                                         # Delete the invalid revision if the DB is not transactional
1086                                         if ( !$wgDBtransactions ) {
1087                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1088                                         }
1089
1090                                         $revisionId = 0;
1091                                         $dbw->rollback();
1092                                 } else {
1093                                         global $wgUseRCPatrol;
1094                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1095                                         # Update recentchanges
1096                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1097                                                 # Mark as patrolled if the user can do so
1098                                                 $patrolled = $wgUseRCPatrol && !count(
1099                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1100                                                 # Add RC row to the DB
1101                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1102                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1103                                                         $revisionId, $patrolled
1104                                                 );
1105
1106                                                 # Log auto-patrolled edits
1107                                                 if ( $patrolled ) {
1108                                                         PatrolLog::record( $rc, true );
1109                                                 }
1110                                         }
1111                                         $user->incEditCount();
1112                                         $dbw->commit();
1113                                 }
1114                         }
1115
1116                         if ( !$wgDBtransactions ) {
1117                                 ignore_user_abort( $userAbort );
1118                         }
1119
1120                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1121                         if ( !$status->isOK() ) {
1122                                 wfProfileOut( __METHOD__ );
1123                                 return $status;
1124                         }
1125
1126                         # Update links tables, site stats, etc.
1127                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1128                                 'oldcountable' => $oldcountable ) );
1129
1130                         if ( !$changed ) {
1131                                 $status->warning( 'edit-no-change' );
1132                                 $revision = null;
1133                                 // Keep the same revision ID, but do some updates on it
1134                                 $revisionId = $this->getLatest();
1135                                 // Update page_touched, this is usually implicit in the page update
1136                                 // Other cache updates are done in onArticleEdit()
1137                                 $this->mTitle->invalidateCache();
1138                         }
1139                 } else {
1140                         # Create new article
1141                         $status->value['new'] = true;
1142
1143                         $dbw->begin();
1144
1145                         # Add the page record; stake our claim on this title!
1146                         # This will return false if the article already exists
1147                         $newid = $this->insertOn( $dbw );
1148
1149                         if ( $newid === false ) {
1150                                 $dbw->rollback();
1151                                 $status->fatal( 'edit-already-exists' );
1152
1153                                 wfProfileOut( __METHOD__ );
1154                                 return $status;
1155                         }
1156
1157                         # Save the revision text...
1158                         $revision = new Revision( array(
1159                                 'page'       => $newid,
1160                                 'comment'    => $summary,
1161                                 'minor_edit' => $isminor,
1162                                 'text'       => $text,
1163                                 'user'       => $user->getId(),
1164                                 'user_text'  => $user->getName(),
1165                                 'timestamp'  => $now
1166                         ) );
1167                         $revisionId = $revision->insertOn( $dbw );
1168
1169                         $this->mTitle->resetArticleID( $newid );
1170                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1171                         # @todo FIXME?
1172                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1173
1174                         # Update the page record with revision data
1175                         $this->updateRevisionOn( $dbw, $revision, 0 );
1176
1177                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1178
1179                         # Update recentchanges
1180                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1181                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1182
1183                                 # Mark as patrolled if the user can do so
1184                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1185                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1186                                 # Add RC row to the DB
1187                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1188                                         '', strlen( $text ), $revisionId, $patrolled );
1189
1190                                 # Log auto-patrolled edits
1191                                 if ( $patrolled ) {
1192                                         PatrolLog::record( $rc, true );
1193                                 }
1194                         }
1195                         $user->incEditCount();
1196                         $dbw->commit();
1197
1198                         # Update links, etc.
1199                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1200
1201                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1202                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1203                 }
1204
1205                 # Do updates right now unless deferral was requested
1206                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1207                         wfDoUpdates();
1208                 }
1209
1210                 // Return the new revision (or null) to the caller
1211                 $status->value['revision'] = $revision;
1212
1213                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1214                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1215
1216                 # Promote user to any groups they meet the criteria for
1217                 $user->addAutopromoteOnceGroups( 'onEdit' );
1218
1219                 wfProfileOut( __METHOD__ );
1220                 return $status;
1221         }
1222
1223         /**
1224          * Update the article's restriction field, and leave a log entry.
1225          *
1226          * @param $limit Array: set of restriction keys
1227          * @param $reason String
1228          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1229          * @param $expiry Array: per restriction type expiration
1230          * @param $user User The user updating the restrictions
1231          * @return bool true on success
1232          */
1233         public function updateRestrictions(
1234                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1235         ) {
1236                 global $wgUser, $wgContLang;
1237                 $user = is_null( $user ) ? $wgUser : $user;
1238
1239                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1240
1241                 $id = $this->mTitle->getArticleID();
1242
1243                 if ( $id <= 0 ) {
1244                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1245                         return false;
1246                 }
1247
1248                 if ( wfReadOnly() ) {
1249                         wfDebug( "updateRestrictions failed: read-only\n" );
1250                         return false;
1251                 }
1252
1253                 if ( !$this->mTitle->userCan( 'protect' ) ) {
1254                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1255                         return false;
1256                 }
1257
1258                 if ( !$cascade ) {
1259                         $cascade = false;
1260                 }
1261
1262                 // Take this opportunity to purge out expired restrictions
1263                 Title::purgeExpiredRestrictions();
1264
1265                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1266                 # we expect a single selection, but the schema allows otherwise.
1267                 $current = array();
1268                 $updated = self::flattenRestrictions( $limit );
1269                 $changed = false;
1270
1271                 foreach ( $restrictionTypes as $action ) {
1272                         if ( isset( $expiry[$action] ) ) {
1273                                 # Get current restrictions on $action
1274                                 $aLimits = $this->mTitle->getRestrictions( $action );
1275                                 $current[$action] = implode( '', $aLimits );
1276                                 # Are any actual restrictions being dealt with here?
1277                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1278
1279                                 # If something changed, we need to log it. Checking $aRChanged
1280                                 # assures that "unprotecting" a page that is not protected does
1281                                 # not log just because the expiry was "changed".
1282                                 if ( $aRChanged &&
1283                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1284                                 {
1285                                         $changed = true;
1286                                 }
1287                         }
1288                 }
1289
1290                 $current = self::flattenRestrictions( $current );
1291
1292                 $changed = ( $changed || $current != $updated );
1293                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1294                 $protect = ( $updated != '' );
1295
1296                 # If nothing's changed, do nothing
1297                 if ( $changed ) {
1298                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1299                                 $dbw = wfGetDB( DB_MASTER );
1300
1301                                 # Prepare a null revision to be added to the history
1302                                 $modified = $current != '' && $protect;
1303
1304                                 if ( $protect ) {
1305                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1306                                 } else {
1307                                         $comment_type = 'unprotectedarticle';
1308                                 }
1309
1310                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1311
1312                                 # Only restrictions with the 'protect' right can cascade...
1313                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1314                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1315
1316                                 # The schema allows multiple restrictions
1317                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1318                                         $cascade = false;
1319                                 }
1320
1321                                 $cascade_description = '';
1322
1323                                 if ( $cascade ) {
1324                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1325                                 }
1326
1327                                 if ( $reason ) {
1328                                         $comment .= ": $reason";
1329                                 }
1330
1331                                 $editComment = $comment;
1332                                 $encodedExpiry = array();
1333                                 $protect_description = '';
1334                                 foreach ( $limit as $action => $restrictions ) {
1335                                         if ( !isset( $expiry[$action] ) )
1336                                                 $expiry[$action] = $dbw->getInfinity();
1337
1338                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1339                                         if ( $restrictions != '' ) {
1340                                                 $protect_description .= "[$action=$restrictions] (";
1341                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1342                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1343                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1344                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1345                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1346                                                 } else {
1347                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1348                                                 }
1349
1350                                                 $protect_description .= ') ';
1351                                         }
1352                                 }
1353                                 $protect_description = trim( $protect_description );
1354
1355                                 if ( $protect_description && $protect ) {
1356                                         $editComment .= " ($protect_description)";
1357                                 }
1358
1359                                 if ( $cascade ) {
1360                                         $editComment .= "$cascade_description";
1361                                 }
1362
1363                                 # Update restrictions table
1364                                 foreach ( $limit as $action => $restrictions ) {
1365                                         if ( $restrictions != '' ) {
1366                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1367                                                         array( 'pr_page' => $id,
1368                                                                 'pr_type' => $action,
1369                                                                 'pr_level' => $restrictions,
1370                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1371                                                                 'pr_expiry' => $encodedExpiry[$action]
1372                                                         ),
1373                                                         __METHOD__
1374                                                 );
1375                                         } else {
1376                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1377                                                         'pr_type' => $action ), __METHOD__ );
1378                                         }
1379                                 }
1380
1381                                 # Insert a null revision
1382                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1383                                 $nullRevId = $nullRevision->insertOn( $dbw );
1384
1385                                 $latest = $this->getLatest();
1386                                 # Update page record
1387                                 $dbw->update( 'page',
1388                                         array( /* SET */
1389                                                 'page_touched' => $dbw->timestamp(),
1390                                                 'page_restrictions' => '',
1391                                                 'page_latest' => $nullRevId
1392                                         ), array( /* WHERE */
1393                                                 'page_id' => $id
1394                                         ), __METHOD__
1395                                 );
1396
1397                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1398                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1399
1400                                 # Update the protection log
1401                                 $log = new LogPage( 'protect' );
1402                                 if ( $protect ) {
1403                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1404                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1405                                 } else {
1406                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1407                                 }
1408                         } # End hook
1409                 } # End "changed" check
1410
1411                 return true;
1412         }
1413
1414         /**
1415          * Take an array of page restrictions and flatten it to a string
1416          * suitable for insertion into the page_restrictions field.
1417          * @param $limit Array
1418          * @return String
1419          */
1420         protected static function flattenRestrictions( $limit ) {
1421                 if ( !is_array( $limit ) ) {
1422                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1423                 }
1424
1425                 $bits = array();
1426                 ksort( $limit );
1427
1428                 foreach ( $limit as $action => $restrictions ) {
1429                         if ( $restrictions != '' ) {
1430                                 $bits[] = "$action=$restrictions";
1431                         }
1432                 }
1433
1434                 return implode( ':', $bits );
1435         }
1436
1437         /**
1438          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1439          */
1440         public function isBigDeletion() {
1441                 global $wgDeleteRevisionsLimit;
1442
1443                 if ( $wgDeleteRevisionsLimit ) {
1444                         $revCount = $this->estimateRevisionCount();
1445
1446                         return $revCount > $wgDeleteRevisionsLimit;
1447                 }
1448
1449                 return false;
1450         }
1451
1452         /**
1453          * @return int approximate revision count
1454          */
1455         public function estimateRevisionCount() {
1456                 $dbr = wfGetDB( DB_SLAVE );
1457
1458                 // For an exact count...
1459                 // return $dbr->selectField( 'revision', 'COUNT(*)',
1460                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
1461                 return $dbr->estimateRowCount( 'revision', '*',
1462                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1463         }
1464
1465         /**
1466          * Get the last N authors
1467          * @param $num Integer: number of revisions to get
1468          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1469          * @return array Array of authors, duplicates not removed
1470          */
1471         public function getLastNAuthors( $num, $revLatest = 0 ) {
1472                 wfProfileIn( __METHOD__ );
1473                 // First try the slave
1474                 // If that doesn't have the latest revision, try the master
1475                 $continue = 2;
1476                 $db = wfGetDB( DB_SLAVE );
1477
1478                 do {
1479                         $res = $db->select( array( 'page', 'revision' ),
1480                                 array( 'rev_id', 'rev_user_text' ),
1481                                 array(
1482                                         'page_namespace' => $this->mTitle->getNamespace(),
1483                                         'page_title' => $this->mTitle->getDBkey(),
1484                                         'rev_page = page_id'
1485                                 ), __METHOD__,
1486                                 array(
1487                                         'ORDER BY' => 'rev_timestamp DESC',
1488                                         'LIMIT' => $num
1489                                 )
1490                         );
1491
1492                         if ( !$res ) {
1493                                 wfProfileOut( __METHOD__ );
1494                                 return array();
1495                         }
1496
1497                         $row = $db->fetchObject( $res );
1498
1499                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1500                                 $db = wfGetDB( DB_MASTER );
1501                                 $continue--;
1502                         } else {
1503                                 $continue = 0;
1504                         }
1505                 } while ( $continue );
1506
1507                 $authors = array( $row->rev_user_text );
1508
1509                 foreach ( $res as $row ) {
1510                         $authors[] = $row->rev_user_text;
1511                 }
1512
1513                 wfProfileOut( __METHOD__ );
1514                 return $authors;
1515         }
1516
1517         /**
1518          * Back-end article deletion
1519          * Deletes the article with database consistency, writes logs, purges caches
1520          *
1521          * @param $reason string delete reason for deletion log
1522          * @param suppress bitfield
1523          *      Revision::DELETED_TEXT
1524          *      Revision::DELETED_COMMENT
1525          *      Revision::DELETED_USER
1526          *      Revision::DELETED_RESTRICTED
1527          * @param $id int article ID
1528          * @param $commit boolean defaults to true, triggers transaction end
1529          * @param &$errors Array of errors to append to
1530          * @param $user User The relevant user
1531          * @return boolean true if successful
1532          */
1533         public function doDeleteArticle(
1534                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1535         ) {
1536                 global $wgDeferredUpdateList, $wgUseTrackbacks, $wgUser;
1537                 $user = is_null( $user ) ? $wgUser : $user;
1538
1539                 wfDebug( __METHOD__ . "\n" );
1540
1541                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1542                         return false;
1543                 }
1544                 $dbw = wfGetDB( DB_MASTER );
1545                 $t = $this->mTitle->getDBkey();
1546                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1547
1548                 if ( $t === '' || $id == 0 ) {
1549                         return false;
1550                 }
1551
1552                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 );
1553                 array_push( $wgDeferredUpdateList, $u );
1554
1555                 // Bitfields to further suppress the content
1556                 if ( $suppress ) {
1557                         $bitfield = 0;
1558                         // This should be 15...
1559                         $bitfield |= Revision::DELETED_TEXT;
1560                         $bitfield |= Revision::DELETED_COMMENT;
1561                         $bitfield |= Revision::DELETED_USER;
1562                         $bitfield |= Revision::DELETED_RESTRICTED;
1563                 } else {
1564                         $bitfield = 'rev_deleted';
1565                 }
1566
1567                 $dbw->begin();
1568                 // For now, shunt the revision data into the archive table.
1569                 // Text is *not* removed from the text table; bulk storage
1570                 // is left intact to avoid breaking block-compression or
1571                 // immutable storage schemes.
1572                 //
1573                 // For backwards compatibility, note that some older archive
1574                 // table entries will have ar_text and ar_flags fields still.
1575                 //
1576                 // In the future, we may keep revisions and mark them with
1577                 // the rev_deleted field, which is reserved for this purpose.
1578                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1579                         array(
1580                                 'ar_namespace'  => 'page_namespace',
1581                                 'ar_title'      => 'page_title',
1582                                 'ar_comment'    => 'rev_comment',
1583                                 'ar_user'       => 'rev_user',
1584                                 'ar_user_text'  => 'rev_user_text',
1585                                 'ar_timestamp'  => 'rev_timestamp',
1586                                 'ar_minor_edit' => 'rev_minor_edit',
1587                                 'ar_rev_id'     => 'rev_id',
1588                                 'ar_text_id'    => 'rev_text_id',
1589                                 'ar_text'       => '\'\'', // Be explicit to appease
1590                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1591                                 'ar_len'        => 'rev_len',
1592                                 'ar_page_id'    => 'page_id',
1593                                 'ar_deleted'    => $bitfield
1594                         ), array(
1595                                 'page_id' => $id,
1596                                 'page_id = rev_page'
1597                         ), __METHOD__
1598                 );
1599
1600                 # Delete restrictions for it
1601                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1602
1603                 # Now that it's safely backed up, delete it
1604                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1605                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1606
1607                 if ( !$ok ) {
1608                         $dbw->rollback();
1609                         return false;
1610                 }
1611
1612                 # Fix category table counts
1613                 $cats = array();
1614                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1615
1616                 foreach ( $res as $row ) {
1617                         $cats [] = $row->cl_to;
1618                 }
1619
1620                 $this->updateCategoryCounts( array(), $cats );
1621
1622                 # If using cascading deletes, we can skip some explicit deletes
1623                 if ( !$dbw->cascadingDeletes() ) {
1624                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1625
1626                         if ( $wgUseTrackbacks )
1627                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1628
1629                         # Delete outgoing links
1630                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1631                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
1632                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
1633                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
1634                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
1635                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
1636                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ) );
1637                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
1638                 }
1639
1640                 # If using cleanup triggers, we can skip some manual deletes
1641                 if ( !$dbw->cleanupTriggers() ) {
1642                         # Clean up recentchanges entries...
1643                         $dbw->delete( 'recentchanges',
1644                                 array( 'rc_type != ' . RC_LOG,
1645                                         'rc_namespace' => $this->mTitle->getNamespace(),
1646                                         'rc_title' => $this->mTitle->getDBkey() ),
1647                                 __METHOD__ );
1648                         $dbw->delete( 'recentchanges',
1649                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1650                                 __METHOD__ );
1651                 }
1652
1653                 # Clear caches
1654                 self::onArticleDelete( $this->mTitle );
1655
1656                 # Clear the cached article id so the interface doesn't act like we exist
1657                 $this->mTitle->resetArticleID( 0 );
1658
1659                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1660                 $logtype = $suppress ? 'suppress' : 'delete';
1661                 $log = new LogPage( $logtype );
1662
1663                 # Make sure logging got through
1664                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
1665
1666                 if ( $commit ) {
1667                         $dbw->commit();
1668                 }
1669
1670                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1671                 return true;
1672         }
1673
1674         /**
1675          * Roll back the most recent consecutive set of edits to a page
1676          * from the same user; fails if there are no eligible edits to
1677          * roll back to, e.g. user is the sole contributor. This function
1678          * performs permissions checks on $user, then calls commitRollback()
1679          * to do the dirty work
1680          *
1681          * @param $fromP String: Name of the user whose edits to rollback.
1682          * @param $summary String: Custom summary. Set to default summary if empty.
1683          * @param $token String: Rollback token.
1684          * @param $bot Boolean: If true, mark all reverted edits as bot.
1685          *
1686          * @param $resultDetails Array: contains result-specific array of additional values
1687          *    'alreadyrolled' : 'current' (rev)
1688          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1689          *
1690          * @param $user User The user performing the rollback
1691          * @return array of errors, each error formatted as
1692          *   array(messagekey, param1, param2, ...).
1693          * On success, the array is empty.  This array can also be passed to
1694          * OutputPage::showPermissionsErrorPage().
1695          */
1696         public function doRollback(
1697                 $fromP, $summary, $token, $bot, &$resultDetails, User $user = null
1698         ) {
1699                 global $wgUser;
1700                 $user = is_null( $user ) ? $wgUser : $user;
1701
1702                 $resultDetails = null;
1703
1704                 # Check permissions
1705                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1706                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1707                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1708
1709                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1710                         $errors[] = array( 'sessionfailure' );
1711                 }
1712
1713                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1714                         $errors[] = array( 'actionthrottledtext' );
1715                 }
1716
1717                 # If there were errors, bail out now
1718                 if ( !empty( $errors ) ) {
1719                         return $errors;
1720                 }
1721
1722                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1723         }
1724
1725         /**
1726          * Backend implementation of doRollback(), please refer there for parameter
1727          * and return value documentation
1728          *
1729          * NOTE: This function does NOT check ANY permissions, it just commits the
1730          * rollback to the DB Therefore, you should only call this function direct-
1731          * ly if you want to use custom permissions checks. If you don't, use
1732          * doRollback() instead.
1733          * @param $fromP String: Name of the user whose edits to rollback.
1734          * @param $summary String: Custom summary. Set to default summary if empty.
1735          * @param $bot Boolean: If true, mark all reverted edits as bot.
1736          *
1737          * @param $resultDetails Array: contains result-specific array of additional values
1738          * @param $guser User The user performing the rollback
1739          */
1740         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
1741                 global $wgUseRCPatrol, $wgUser, $wgContLang;
1742                 $guser = is_null( $guser ) ? $wgUser : $guser;
1743
1744                 $dbw = wfGetDB( DB_MASTER );
1745
1746                 if ( wfReadOnly() ) {
1747                         return array( array( 'readonlytext' ) );
1748                 }
1749
1750                 # Get the last editor
1751                 $current = Revision::newFromTitle( $this->mTitle );
1752                 if ( is_null( $current ) ) {
1753                         # Something wrong... no page?
1754                         return array( array( 'notanarticle' ) );
1755                 }
1756
1757                 $from = str_replace( '_', ' ', $fromP );
1758                 # User name given should match up with the top revision.
1759                 # If the user was deleted then $from should be empty.
1760                 if ( $from != $current->getUserText() ) {
1761                         $resultDetails = array( 'current' => $current );
1762                         return array( array( 'alreadyrolled',
1763                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1764                                 htmlspecialchars( $fromP ),
1765                                 htmlspecialchars( $current->getUserText() )
1766                         ) );
1767                 }
1768
1769                 # Get the last edit not by this guy...
1770                 # Note: these may not be public values
1771                 $user = intval( $current->getRawUser() );
1772                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1773                 $s = $dbw->selectRow( 'revision',
1774                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1775                         array( 'rev_page' => $current->getPage(),
1776                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1777                         ), __METHOD__,
1778                         array( 'USE INDEX' => 'page_timestamp',
1779                                 'ORDER BY' => 'rev_timestamp DESC' )
1780                         );
1781                 if ( $s === false ) {
1782                         # No one else ever edited this page
1783                         return array( array( 'cantrollback' ) );
1784                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1785                         # Only admins can see this text
1786                         return array( array( 'notvisiblerev' ) );
1787                 }
1788
1789                 $set = array();
1790                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1791                         # Mark all reverted edits as bot
1792                         $set['rc_bot'] = 1;
1793                 }
1794
1795                 if ( $wgUseRCPatrol ) {
1796                         # Mark all reverted edits as patrolled
1797                         $set['rc_patrolled'] = 1;
1798                 }
1799
1800                 if ( count( $set ) ) {
1801                         $dbw->update( 'recentchanges', $set,
1802                                 array( /* WHERE */
1803                                         'rc_cur_id' => $current->getPage(),
1804                                         'rc_user_text' => $current->getUserText(),
1805                                         "rc_timestamp > '{$s->rev_timestamp}'",
1806                                 ), __METHOD__
1807                         );
1808                 }
1809
1810                 # Generate the edit summary if necessary
1811                 $target = Revision::newFromId( $s->rev_id );
1812                 if ( empty( $summary ) ) {
1813                         if ( $from == '' ) { // no public user name
1814                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1815                         } else {
1816                                 $summary = wfMsgForContent( 'revertpage' );
1817                         }
1818                 }
1819
1820                 # Allow the custom summary to use the same args as the default message
1821                 $args = array(
1822                         $target->getUserText(), $from, $s->rev_id,
1823                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1824                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1825                 );
1826                 $summary = wfMsgReplaceArgs( $summary, $args );
1827
1828                 # Save
1829                 $flags = EDIT_UPDATE;
1830
1831                 if ( $guser->isAllowed( 'minoredit' ) ) {
1832                         $flags |= EDIT_MINOR;
1833                 }
1834
1835                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1836                         $flags |= EDIT_FORCE_BOT;
1837                 }
1838
1839                 # Actually store the edit
1840                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1841                 if ( !empty( $status->value['revision'] ) ) {
1842                         $revId = $status->value['revision']->getId();
1843                 } else {
1844                         $revId = false;
1845                 }
1846
1847                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1848
1849                 $resultDetails = array(
1850                         'summary' => $summary,
1851                         'current' => $current,
1852                         'target'  => $target,
1853                         'newid'   => $revId
1854                 );
1855
1856                 return array();
1857         }
1858
1859         /**
1860          * Do standard deferred updates after page view
1861          * @param $user User The relevant user
1862          */
1863         public function doViewUpdates( User $user ) {
1864                 global $wgDeferredUpdateList, $wgDisableCounters;
1865                 if ( wfReadOnly() ) {
1866                         return;
1867                 }
1868
1869                 # Don't update page view counters on views from bot users (bug 14044)
1870                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1871                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getId() );
1872                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
1873                 }
1874
1875                 # Update newtalk / watchlist notification status
1876                 $user->clearNotification( $this->mTitle );
1877         }
1878
1879         /**
1880          * Prepare text which is about to be saved.
1881          * Returns a stdclass with source, pst and output members
1882          */
1883         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1884                 global $wgParser, $wgUser;
1885                 $user = is_null( $user ) ? $wgUser : $user;
1886                 // @TODO fixme: check $user->getId() here???
1887                 if ( $this->mPreparedEdit
1888                         && $this->mPreparedEdit->newText == $text
1889                         && $this->mPreparedEdit->revid == $revid
1890                 ) {
1891                         // Already prepared
1892                         return $this->mPreparedEdit;
1893                 }
1894
1895                 $popts = ParserOptions::newFromUser( $user );
1896                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1897
1898                 $edit = (object)array();
1899                 $edit->revid = $revid;
1900                 $edit->newText = $text;
1901                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1902                 $edit->popts = $this->getParserOptions( true );
1903                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1904                 $edit->oldText = $this->getRawText();
1905
1906                 $this->mPreparedEdit = $edit;
1907
1908                 return $edit;
1909         }
1910
1911         /**
1912          * Do standard deferred updates after page edit.
1913          * Update links tables, site stats, search index and message cache.
1914          * Purges pages that include this page if the text was changed here.
1915          * Every 100th edit, prune the recent changes table.
1916          *
1917          * @private
1918          * @param $revision Revision object
1919          * @param $user User object that did the revision
1920          * @param $options Array of options, following indexes are used:
1921          * - changed: boolean, whether the revision changed the content (default true)
1922          * - created: boolean, whether the revision created the page (default false)
1923          * - oldcountable: boolean or null (default null):
1924          *   - boolean: whether the page was counted as an article before that
1925          *     revision, only used in changed is true and created is false
1926          *   - null: don't change the article count
1927          */
1928         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1929                 global $wgDeferredUpdateList, $wgEnableParserCache;
1930
1931                 wfProfileIn( __METHOD__ );
1932
1933                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1934                 $text = $revision->getText();
1935
1936                 # Parse the text
1937                 # Be careful not to double-PST: $text is usually already PST-ed once
1938                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1939                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1940                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1941                 } else {
1942                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1943                         $editInfo = $this->mPreparedEdit;
1944                 }
1945
1946                 # Save it to the parser cache
1947                 if ( $wgEnableParserCache ) {
1948                         $parserCache = ParserCache::singleton();
1949                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1950                 }
1951
1952                 # Update the links tables
1953                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1954                 $u->doUpdate();
1955
1956                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1957
1958                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1959                         if ( 0 == mt_rand( 0, 99 ) ) {
1960                                 // Flush old entries from the `recentchanges` table; we do this on
1961                                 // random requests so as to avoid an increase in writes for no good reason
1962                                 global $wgRCMaxAge;
1963
1964                                 $dbw = wfGetDB( DB_MASTER );
1965                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1966                                 $dbw->delete(
1967                                         'recentchanges',
1968                                         array( "rc_timestamp < '$cutoff'" ),
1969                                         __METHOD__
1970                                 );
1971                         }
1972                 }
1973
1974                 $id = $this->getId();
1975                 $title = $this->mTitle->getPrefixedDBkey();
1976                 $shortTitle = $this->mTitle->getDBkey();
1977
1978                 if ( 0 == $id ) {
1979                         wfProfileOut( __METHOD__ );
1980                         return;
1981                 }
1982
1983                 if ( !$options['changed'] ) {
1984                         $good = 0;
1985                         $total = 0;
1986                 } elseif ( $options['created'] ) {
1987                         $good = (int)$this->isCountable( $editInfo );
1988                         $total = 1;
1989                 } elseif ( $options['oldcountable'] !== null ) {
1990                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1991                         $total = 0;
1992                 } else {
1993                         $good = 0;
1994                         $total = 0;
1995                 }
1996
1997                 $wgDeferredUpdateList[] = new SiteStatsUpdate( 0, 1, $good, $total );
1998                 $wgDeferredUpdateList[] = new SearchUpdate( $id, $title, $text );
1999
2000                 # If this is another user's talk page, update newtalk.
2001                 # Don't do this if $options['changed'] = false (null-edits) nor if
2002                 # it's a minor edit and the user doesn't want notifications for those.
2003                 if ( $options['changed']
2004                         && $this->mTitle->getNamespace() == NS_USER_TALK
2005                         && $shortTitle != $user->getTitleKey()
2006                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2007                 ) {
2008                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2009                                 $other = User::newFromName( $shortTitle, false );
2010                                 if ( !$other ) {
2011                                         wfDebug( __METHOD__ . ": invalid username\n" );
2012                                 } elseif ( User::isIP( $shortTitle ) ) {
2013                                         // An anonymous user
2014                                         $other->setNewtalk( true );
2015                                 } elseif ( $other->isLoggedIn() ) {
2016                                         $other->setNewtalk( true );
2017                                 } else {
2018                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2019                                 }
2020                         }
2021                 }
2022
2023                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2024                         MessageCache::singleton()->replace( $shortTitle, $text );
2025                 }
2026
2027                 if( $options['created'] ) {
2028                         self::onArticleCreate( $this->mTitle );
2029                 } else {
2030                         self::onArticleEdit( $this->mTitle );
2031                 }
2032
2033                 wfProfileOut( __METHOD__ );
2034         }
2035
2036         /**
2037          * Perform article updates on a special page creation.
2038          *
2039          * @param $rev Revision object
2040          *
2041          * @todo This is a shitty interface function. Kill it and replace the
2042          * other shitty functions like doEditUpdates and such so it's not needed
2043          * anymore.
2044          * @deprecated since 1.19, use doEditUpdates()
2045          */
2046         public function createUpdates( $rev ) {
2047                 global $wgUser;
2048                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2049         }
2050
2051         /**
2052          * This function is called right before saving the wikitext,
2053          * so we can do things like signatures and links-in-context.
2054          *
2055          * @param $text String article contents
2056          * @param $user User object: user doing the edit
2057          * @param $popts ParserOptions object: parser options, default options for
2058          *               the user loaded if null given
2059          * @return string article contents with altered wikitext markup (signatures
2060          *      converted, {{subst:}}, templates, etc.)
2061          */
2062         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2063                 global $wgParser, $wgUser;
2064                 $user = is_null( $user ) ? $wgUser : $user;
2065
2066                 if ( $popts === null ) {
2067                         $popts = ParserOptions::newFromUser( $user );
2068                 }
2069
2070                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2071         }
2072
2073         /**
2074          * Loads page_touched and returns a value indicating if it should be used
2075          * @return boolean true if not a redirect
2076          */
2077         public function checkTouched() {
2078                 if ( !$this->mDataLoaded ) {
2079                         $this->loadPageData();
2080                 }
2081                 return !$this->mIsRedirect;
2082         }
2083
2084         /**
2085          * Get the page_touched field
2086          * @return string containing GMT timestamp
2087          */
2088         public function getTouched() {
2089                 if ( !$this->mDataLoaded ) {
2090                         $this->loadPageData();
2091                 }
2092                 return $this->mTouched;
2093         }
2094
2095         /**
2096          * Get the page_latest field
2097          * @return integer rev_id of current revision
2098          */
2099         public function getLatest() {
2100                 if ( !$this->mDataLoaded ) {
2101                         $this->loadPageData();
2102                 }
2103                 return (int)$this->mLatest;
2104         }
2105
2106         /**
2107          * Edit an article without doing all that other stuff
2108          * The article must already exist; link tables etc
2109          * are not updated, caches are not flushed.
2110          *
2111          * @param $text String: text submitted
2112          * @param $user User The relevant user
2113          * @param $comment String: comment submitted
2114          * @param $minor Boolean: whereas it's a minor modification
2115          */
2116         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2117                 wfProfileIn( __METHOD__ );
2118
2119                 $dbw = wfGetDB( DB_MASTER );
2120                 $revision = new Revision( array(
2121                         'page'       => $this->getId(),
2122                         'text'       => $text,
2123                         'comment'    => $comment,
2124                         'minor_edit' => $minor ? 1 : 0,
2125                 ) );
2126                 $revision->insertOn( $dbw );
2127                 $this->updateRevisionOn( $dbw, $revision );
2128
2129                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2130
2131                 wfProfileOut( __METHOD__ );
2132         }
2133
2134         /**
2135          * The onArticle*() functions are supposed to be a kind of hooks
2136          * which should be called whenever any of the specified actions
2137          * are done.
2138          *
2139          * This is a good place to put code to clear caches, for instance.
2140          *
2141          * This is called on page move and undelete, as well as edit
2142          *
2143          * @param $title Title object
2144          */
2145         public static function onArticleCreate( $title ) {
2146                 # Update existence markers on article/talk tabs...
2147                 if ( $title->isTalkPage() ) {
2148                         $other = $title->getSubjectPage();
2149                 } else {
2150                         $other = $title->getTalkPage();
2151                 }
2152
2153                 $other->invalidateCache();
2154                 $other->purgeSquid();
2155
2156                 $title->touchLinks();
2157                 $title->purgeSquid();
2158                 $title->deleteTitleProtection();
2159         }
2160
2161         /**
2162          * Clears caches when article is deleted
2163          *
2164          * @param $title Title
2165          */
2166         public static function onArticleDelete( $title ) {
2167                 # Update existence markers on article/talk tabs...
2168                 if ( $title->isTalkPage() ) {
2169                         $other = $title->getSubjectPage();
2170                 } else {
2171                         $other = $title->getTalkPage();
2172                 }
2173
2174                 $other->invalidateCache();
2175                 $other->purgeSquid();
2176
2177                 $title->touchLinks();
2178                 $title->purgeSquid();
2179
2180                 # File cache
2181                 HTMLFileCache::clearFileCache( $title );
2182
2183                 # Messages
2184                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2185                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2186                 }
2187
2188                 # Images
2189                 if ( $title->getNamespace() == NS_FILE ) {
2190                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2191                         $update->doUpdate();
2192                 }
2193
2194                 # User talk pages
2195                 if ( $title->getNamespace() == NS_USER_TALK ) {
2196                         $user = User::newFromName( $title->getText(), false );
2197                         $user->setNewtalk( false );
2198                 }
2199
2200                 # Image redirects
2201                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2202         }
2203
2204         /**
2205          * Purge caches on page update etc
2206          *
2207          * @param $title Title object
2208          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2209          */
2210         public static function onArticleEdit( $title ) {
2211                 global $wgDeferredUpdateList;
2212
2213                 // Invalidate caches of articles which include this page
2214                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
2215
2216                 // Invalidate the caches of all pages which redirect here
2217                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
2218
2219                 # Purge squid for this page only
2220                 $title->purgeSquid();
2221
2222                 # Clear file cache for this page only
2223                 HTMLFileCache::clearFileCache( $title );
2224         }
2225
2226         /**#@-*/
2227
2228         /**
2229          * Return a list of templates used by this article.
2230          * Uses the templatelinks table
2231          *
2232          * @return Array of Title objects
2233          */
2234         public function getUsedTemplates() {
2235                 $result = array();
2236                 $id = $this->mTitle->getArticleID();
2237
2238                 if ( $id == 0 ) {
2239                         return array();
2240                 }
2241
2242                 $dbr = wfGetDB( DB_SLAVE );
2243                 $res = $dbr->select( array( 'templatelinks' ),
2244                         array( 'tl_namespace', 'tl_title' ),
2245                         array( 'tl_from' => $id ),
2246                         __METHOD__ );
2247
2248                 if ( $res !== false ) {
2249                         foreach ( $res as $row ) {
2250                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2251                         }
2252                 }
2253
2254                 return $result;
2255         }
2256
2257         /**
2258          * Returns a list of hidden categories this page is a member of.
2259          * Uses the page_props and categorylinks tables.
2260          *
2261          * @return Array of Title objects
2262          */
2263         public function getHiddenCategories() {
2264                 $result = array();
2265                 $id = $this->mTitle->getArticleID();
2266
2267                 if ( $id == 0 ) {
2268                         return array();
2269                 }
2270
2271                 $dbr = wfGetDB( DB_SLAVE );
2272                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2273                         array( 'cl_to' ),
2274                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2275                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2276                         __METHOD__ );
2277
2278                 if ( $res !== false ) {
2279                         foreach ( $res as $row ) {
2280                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2281                         }
2282                 }
2283
2284                 return $result;
2285         }
2286
2287         /**
2288         * Return an applicable autosummary if one exists for the given edit.
2289         * @param $oldtext String: the previous text of the page.
2290         * @param $newtext String: The submitted text of the page.
2291         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2292         * @return string An appropriate autosummary, or an empty string.
2293         */
2294         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2295                 global $wgContLang;
2296
2297                 # Decide what kind of autosummary is needed.
2298
2299                 # Redirect autosummaries
2300                 $ot = Title::newFromRedirect( $oldtext );
2301                 $rt = Title::newFromRedirect( $newtext );
2302
2303                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2304                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
2305                 }
2306
2307                 # New page autosummaries
2308                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2309                         # If they're making a new article, give its text, truncated, in the summary.
2310
2311                         $truncatedtext = $wgContLang->truncate(
2312                                 str_replace( "\n", ' ', $newtext ),
2313                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2314
2315                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2316                 }
2317
2318                 # Blanking autosummaries
2319                 if ( $oldtext != '' && $newtext == '' ) {
2320                         return wfMsgForContent( 'autosumm-blank' );
2321                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2322                         # Removing more than 90% of the article
2323
2324                         $truncatedtext = $wgContLang->truncate(
2325                                 $newtext,
2326                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2327
2328                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2329                 }
2330
2331                 # If we reach this point, there's no applicable autosummary for our case, so our
2332                 # autosummary is empty.
2333                 return '';
2334         }
2335
2336         /**
2337          * Get parser options suitable for rendering the primary article wikitext
2338          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
2339          * @return mixed ParserOptions object or boolean false
2340          */
2341         public function getParserOptions( $canonical = false ) {
2342                 global $wgUser, $wgLanguageCode;
2343
2344                 if ( !$this->mParserOptions || $canonical ) {
2345                         $user = !$canonical ? $wgUser : new User;
2346                         $parserOptions = new ParserOptions( $user );
2347                         $parserOptions->setTidy( true );
2348                         $parserOptions->enableLimitReport();
2349
2350                         if ( $canonical ) {
2351                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
2352                                 return $parserOptions;
2353                         }
2354                         $this->mParserOptions = $parserOptions;
2355                 }
2356                 // Clone to allow modifications of the return value without affecting cache
2357                 return clone $this->mParserOptions;
2358         }
2359
2360         /**
2361         * Get parser options suitable for rendering the primary article wikitext
2362         * @param User $user
2363         * @return ParserOptions
2364         */
2365         public function makeParserOptions( User $user ) {
2366                 $options = ParserOptions::newFromUser( $user );
2367                 $options->enableLimitReport(); // show inclusion/loop reports
2368                 $options->setTidy( true ); // fix bad HTML
2369                 return $options;
2370         }
2371
2372         /**
2373          * Update all the appropriate counts in the category table, given that
2374          * we've added the categories $added and deleted the categories $deleted.
2375          *
2376          * @param $added array   The names of categories that were added
2377          * @param $deleted array The names of categories that were deleted
2378          */
2379         public function updateCategoryCounts( $added, $deleted ) {
2380                 $ns = $this->mTitle->getNamespace();
2381                 $dbw = wfGetDB( DB_MASTER );
2382
2383                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2384                 # exist, we might legitimately not create it, but it's simpler to just
2385                 # create it and then give it a negative value, since the value is bogus
2386                 # anyway.
2387                 #
2388                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2389                 $insertCats = array_merge( $added, $deleted );
2390                 if ( !$insertCats ) {
2391                         # Okay, nothing to do
2392                         return;
2393                 }
2394
2395                 $insertRows = array();
2396
2397                 foreach ( $insertCats as $cat ) {
2398                         $insertRows[] = array(
2399                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2400                                 'cat_title' => $cat
2401                         );
2402                 }
2403                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2404
2405                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2406                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2407
2408                 if ( $ns == NS_CATEGORY ) {
2409                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2410                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2411                 } elseif ( $ns == NS_FILE ) {
2412                         $addFields[]    = 'cat_files = cat_files + 1';
2413                         $removeFields[] = 'cat_files = cat_files - 1';
2414                 }
2415
2416                 if ( $added ) {
2417                         $dbw->update(
2418                                 'category',
2419                                 $addFields,
2420                                 array( 'cat_title' => $added ),
2421                                 __METHOD__
2422                         );
2423                 }
2424
2425                 if ( $deleted ) {
2426                         $dbw->update(
2427                                 'category',
2428                                 $removeFields,
2429                                 array( 'cat_title' => $deleted ),
2430                                 __METHOD__
2431                         );
2432                 }
2433         }
2434
2435         /*
2436         * @deprecated since 1.19
2437         */
2438         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2439                 global $wgUser;
2440                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2441         }
2442
2443         /*
2444         * @deprecated since 1.19
2445         */
2446         public function viewUpdates() {
2447                 global $wgUser;
2448                 return $this->doViewUpdates( $wgUser );
2449         }
2450
2451         /*
2452         * @deprecated since 1.19
2453         */
2454         public function useParserCache( $oldid ) {
2455                 global $wgUser;
2456                 return $this->isParserCacheUsed( $wgUser, $oldid );
2457         }
2458 }