includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         /**
  17          * @var Title
  18          * @protected
  19          */
  20         public $mTitle = null;
  21
  22         /**@{{
  23          * @protected
  24          */
  25         public $mCounter = -1;               // !< Integer (-1 means "not loaded")
  26         public $mDataLoaded = false;         // !< Boolean
  27         public $mIsRedirect = false;         // !< Boolean
  28         public $mLatest = false;             // !< Boolean
  29         public $mPreparedEdit = false;           // !< Array
  30         public $mRedirectTarget = null;          // !< Title object
  31         public $mLastRevision = null;            // !< Revision object
  32         public $mTimestamp = '';             // !< String
  33         public $mTouched = '19700101000000'; // !< String
  34         /**@}}*/
  35
  36         /**
  37          * @protected
  38          * @var ParserOptions: ParserOptions object for $wgUser articles
  39          */
  40         public $mParserOptions;
  41
  42         /**
  43          * Constructor and clear the article
  44          * @param $title Title Reference to a Title object.
  45          */
  46         public function __construct( Title $title ) {
  47                 $this->mTitle = $title;
  48         }
  49
  50         /**
  51          * Create a WikiPage object of the appropriate class for the given title.
  52          *
  53          * @param $title Title
  54          * @return WikiPage object of the appropriate type
  55          */
  56         public static function factory( Title $title ) {
  57                 $ns = $title->getNamespace();
  58
  59                 if ( $ns == NS_MEDIA ) {
  60                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  61                 } elseif ( $ns < 0 ) {
  62                         throw new MWException( "Invalid or virtual namespace $ns given." );
  63                 }
  64
  65                 switch ( $ns ) {
  66                         case NS_FILE:
  67                                 $page = new WikiFilePage( $title );
  68                                 break;
  69                         case NS_CATEGORY:
  70                                 $page = new WikiCategoryPage( $title );
  71                                 break;
  72                         default:
  73                                 $page = new WikiPage( $title );
  74                 }
  75
  76                 return $page;
  77         }
  78
  79         /**
  80          * Constructor from a page id
  81          *
  82          * @param $id Int article ID to load
  83          *
  84          * @return WikiPage
  85          */
  86         public static function newFromID( $id ) {
  87                 $t = Title::newFromID( $id );
  88                 if ( $t ) {
  89                         return self::factory( $t );
  90                 }
  91                 return null;
  92         }
  93
  94         /**
  95          * Returns overrides for action handlers.
  96          * Classes listed here will be used instead of the default one when
  97          * (and only when) $wgActions[$action] === true. This allows subclasses
  98          * to override the default behavior.
  99          *
 100          * @todo: move this UI stuff somewhere else
 101          *
 102          * @return Array
 103          */
 104         public function getActionOverrides() {
 105                 return array();
 106         }
 107
 108         /**
 109          * If this page is a redirect, get its target
 110          *
 111          * The target will be fetched from the redirect table if possible.
 112          * If this page doesn't have an entry there, call insertRedirect()
 113          * @return Title|mixed object, or null if this page is not a redirect
 114          */
 115         public function getRedirectTarget() {
 116                 if ( !$this->mTitle->isRedirect() ) {
 117                         return null;
 118                 }
 119
 120                 if ( $this->mRedirectTarget !== null ) {
 121                         return $this->mRedirectTarget;
 122                 }
 123
 124                 # Query the redirect table
 125                 $dbr = wfGetDB( DB_SLAVE );
 126                 $row = $dbr->selectRow( 'redirect',
 127                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 128                         array( 'rd_from' => $this->getId() ),
 129                         __METHOD__
 130                 );
 131
 132                 // rd_fragment and rd_interwiki were added later, populate them if empty
 133                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 134                         return $this->mRedirectTarget = Title::makeTitle(
 135                                 $row->rd_namespace, $row->rd_title,
 136                                 $row->rd_fragment, $row->rd_interwiki );
 137                 }
 138
 139                 # This page doesn't have an entry in the redirect table
 140                 return $this->mRedirectTarget = $this->insertRedirect();
 141         }
 142
 143         /**
 144          * Insert an entry for this page into the redirect table.
 145          *
 146          * Don't call this function directly unless you know what you're doing.
 147          * @return Title object or null if not a redirect
 148          */
 149         public function insertRedirect() {
 150                 // recurse through to only get the final target
 151                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 152                 if ( !$retval ) {
 153                         return null;
 154                 }
 155                 $this->insertRedirectEntry( $retval );
 156                 return $retval;
 157         }
 158
 159         /**
 160          * Insert or update the redirect table entry for this page to indicate
 161          * it redirects to $rt .
 162          * @param $rt Title redirect target
 163          */
 164         public function insertRedirectEntry( $rt ) {
 165                 $dbw = wfGetDB( DB_MASTER );
 166                 $dbw->replace( 'redirect', array( 'rd_from' ),
 167                         array(
 168                                 'rd_from'      => $this->getId(),
 169                                 'rd_namespace' => $rt->getNamespace(),
 170                                 'rd_title'     => $rt->getDBkey(),
 171                                 'rd_fragment'  => $rt->getFragment(),
 172                                 'rd_interwiki' => $rt->getInterwiki(),
 173                         ),
 174                         __METHOD__
 175                 );
 176         }
 177
 178         /**
 179          * Get the Title object or URL this page redirects to
 180          *
 181          * @return mixed false, Title of in-wiki target, or string with URL
 182          */
 183         public function followRedirect() {
 184                 return $this->getRedirectURL( $this->getRedirectTarget() );
 185         }
 186
 187         /**
 188          * Get the Title object or URL to use for a redirect. We use Title
 189          * objects for same-wiki, non-special redirects and URLs for everything
 190          * else.
 191          * @param $rt Title Redirect target
 192          * @return mixed false, Title object of local target, or string with URL
 193          */
 194         public function getRedirectURL( $rt ) {
 195                 if ( $rt ) {
 196                         if ( $rt->getInterwiki() != '' ) {
 197                                 if ( $rt->isLocal() ) {
 198                                         // Offsite wikis need an HTTP redirect.
 199                                         //
 200                                         // This can be hard to reverse and may produce loops,
 201                                         // so they may be disabled in the site configuration.
 202                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 203                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 204                                 }
 205                         } else {
 206                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 207                                         // Gotta handle redirects to special pages differently:
 208                                         // Fill the HTTP response "Location" header and ignore
 209                                         // the rest of the page we're on.
 210                                         //
 211                                         // This can be hard to reverse, so they may be disabled.
 212                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 213                                                 // rolleyes
 214                                         } else {
 215                                                 return $rt->getFullURL();
 216                                         }
 217                                 }
 218
 219                                 return $rt;
 220                         }
 221                 }
 222
 223                 // No or invalid redirect
 224                 return false;
 225         }
 226
 227         /**
 228          * Get the title object of the article
 229          * @return Title object of this page
 230          */
 231         public function getTitle() {
 232                 return $this->mTitle;
 233         }
 234
 235         /**
 236          * Clear the object
 237          */
 238         public function clear() {
 239                 $this->mDataLoaded = false;
 240
 241                 $this->mCounter = -1; # Not loaded
 242                 $this->mRedirectTarget = null; # Title object if set
 243                 $this->mLastRevision = null; # Latest revision
 244                 $this->mTimestamp = '';
 245                 $this->mTouched = '19700101000000';
 246                 $this->mIsRedirect = false;
 247                 $this->mLatest = false;
 248                 $this->mPreparedEdit = false;
 249         }
 250
 251         /**
 252          * Get the text that needs to be saved in order to undo all revisions
 253          * between $undo and $undoafter. Revisions must belong to the same page,
 254          * must exist and must not be deleted
 255          * @param $undo Revision
 256          * @param $undoafter Revision Must be an earlier revision than $undo
 257          * @return mixed string on success, false on failure
 258          */
 259         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 260                 $cur_text = $this->getRawText();
 261                 if ( $cur_text === false ) {
 262                         return false; // no page
 263                 }
 264                 $undo_text = $undo->getText();
 265                 $undoafter_text = $undoafter->getText();
 266
 267                 if ( $cur_text == $undo_text ) {
 268                         # No use doing a merge if it's just a straight revert.
 269                         return $undoafter_text;
 270                 }
 271
 272                 $undone_text = '';
 273
 274                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 275                         return false;
 276                 }
 277
 278                 return $undone_text;
 279         }
 280
 281         /**
 282          * Return the list of revision fields that should be selected to create
 283          * a new page.
 284          *
 285          * @return array
 286          */
 287         public static function selectFields() {
 288                 return array(
 289                         'page_id',
 290                         'page_namespace',
 291                         'page_title',
 292                         'page_restrictions',
 293                         'page_counter',
 294                         'page_is_redirect',
 295                         'page_is_new',
 296                         'page_random',
 297                         'page_touched',
 298                         'page_latest',
 299                         'page_len',
 300                 );
 301         }
 302
 303         /**
 304          * Fetch a page record with the given conditions
 305          * @param $dbr DatabaseBase object
 306          * @param $conditions Array
 307          * @return mixed Database result resource, or false on failure
 308          */
 309         protected function pageData( $dbr, $conditions ) {
 310                 $fields = self::selectFields();
 311
 312                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 313
 314                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 315
 316                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 317
 318                 return $row;
 319         }
 320
 321         /**
 322          * Fetch a page record matching the Title object's namespace and title
 323          * using a sanitized title string
 324          *
 325          * @param $dbr DatabaseBase object
 326          * @param $title Title object
 327          * @return mixed Database result resource, or false on failure
 328          */
 329         public function pageDataFromTitle( $dbr, $title ) {
 330                 return $this->pageData( $dbr, array(
 331                         'page_namespace' => $title->getNamespace(),
 332                         'page_title'     => $title->getDBkey() ) );
 333         }
 334
 335         /**
 336          * Fetch a page record matching the requested ID
 337          *
 338          * @param $dbr DatabaseBase
 339          * @param $id Integer
 340          * @return mixed Database result resource, or false on failure
 341          */
 342         public function pageDataFromId( $dbr, $id ) {
 343                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 344         }
 345
 346         /**
 347          * Set the general counter, title etc data loaded from
 348          * some source.
 349          *
 350          * @param $data Object|String One of the following:
 351          *              A DB query result object or...
 352          *              "fromdb" to get from a slave DB or...
 353          *              "fromdbmaster" to get from the master DB
 354          * @return void
 355          */
 356         public function loadPageData( $data = 'fromdb' ) {
 357                 if ( $data === 'fromdbmaster' ) {
 358                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 359                 } elseif ( $data === 'fromdb' ) { // slave
 360                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 361                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 362                         # Note that DB also stores the master position in the session and checks it.
 363                         $touched = $this->getCachedLastEditTime();
 364                         if ( $touched ) { // key set
 365                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 366                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 367                                 }
 368                         }
 369                 }
 370
 371                 $lc = LinkCache::singleton();
 372
 373                 if ( $data ) {
 374                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle,
 375                                 $data->page_len, $data->page_is_redirect, $data->page_latest );
 376
 377                         $this->mTitle->loadFromRow( $data );
 378
 379                         # Old-fashioned restrictions
 380                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 381
 382                         $this->mCounter     = intval( $data->page_counter );
 383                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 384                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 385                         $this->mLatest      = intval( $data->page_latest );
 386                 } else {
 387                         $lc->addBadLinkObj( $this->mTitle );
 388
 389                         $this->mTitle->loadFromRow( false );
 390                 }
 391
 392                 $this->mDataLoaded = true;
 393         }
 394
 395         /**
 396          * @return int Page ID
 397          */
 398         public function getId() {
 399                 return $this->mTitle->getArticleID();
 400         }
 401
 402         /**
 403          * @return bool Whether or not the page exists in the database
 404          */
 405         public function exists() {
 406                 return $this->getId() > 0;
 407         }
 408
 409         /**
 410          * Check if this page is something we're going to be showing
 411          * some sort of sensible content for. If we return false, page
 412          * views (plain action=view) will return an HTTP 404 response,
 413          * so spiders and robots can know they're following a bad link.
 414          *
 415          * @return bool
 416          */
 417         public function hasViewableContent() {
 418                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 419         }
 420
 421         /**
 422          * @return int The view count for the page
 423          */
 424         public function getCount() {
 425                 if ( -1 == $this->mCounter ) {
 426                         $id = $this->getId();
 427
 428                         if ( $id == 0 ) {
 429                                 $this->mCounter = 0;
 430                         } else {
 431                                 $dbr = wfGetDB( DB_SLAVE );
 432                                 $this->mCounter = $dbr->selectField( 'page',
 433                                         'page_counter',
 434                                         array( 'page_id' => $id ),
 435                                         __METHOD__
 436                                 );
 437                         }
 438                 }
 439
 440                 return $this->mCounter;
 441         }
 442
 443         /**
 444          * Determine whether a page would be suitable for being counted as an
 445          * article in the site_stats table based on the title & its content
 446          *
 447          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 448          *        if false, the current database state will be used
 449          * @return Boolean
 450          */
 451         public function isCountable( $editInfo = false ) {
 452                 global $wgArticleCountMethod;
 453
 454                 if ( !$this->mTitle->isContentPage() ) {
 455                         return false;
 456                 }
 457
 458                 $text = $editInfo ? $editInfo->pst : false;
 459
 460                 if ( $this->isRedirect( $text ) ) {
 461                         return false;
 462                 }
 463
 464                 switch ( $wgArticleCountMethod ) {
 465                 case 'any':
 466                         return true;
 467                 case 'comma':
 468                         if ( $text === false ) {
 469                                 $text = $this->getRawText();
 470                         }
 471                         return strpos( $text,  ',' ) !== false;
 472                 case 'link':
 473                         if ( $editInfo ) {
 474                                 // ParserOutput::getLinks() is a 2D array of page links, so
 475                                 // to be really correct we would need to recurse in the array
 476                                 // but the main array should only have items in it if there are
 477                                 // links.
 478                                 return (bool)count( $editInfo->output->getLinks() );
 479                         } else {
 480                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 481                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 482                         }
 483                 }
 484         }
 485
 486         /**
 487          * Tests if the article text represents a redirect
 488          *
 489          * @param $text mixed string containing article contents, or boolean
 490          * @return bool
 491          */
 492         public function isRedirect( $text = false ) {
 493                 if ( $text === false ) {
 494                         if ( !$this->mDataLoaded ) {
 495                                 $this->loadPageData();
 496                         }
 497
 498                         return (bool)$this->mIsRedirect;
 499                 } else {
 500                         return Title::newFromRedirect( $text ) !== null;
 501                 }
 502         }
 503
 504         /**
 505          * Loads everything except the text
 506          * This isn't necessary for all uses, so it's only done if needed.
 507          */
 508         protected function loadLastEdit() {
 509                 if ( $this->mLastRevision !== null ) {
 510                         return; // already loaded
 511                 }
 512
 513                 $latest = $this->getLatest();
 514                 if ( !$latest ) {
 515                         return; // page doesn't exist or is missing page_latest info
 516                 }
 517
 518                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 519                 if ( $revision ) { // sanity
 520                         $this->setLastEdit( $revision );
 521                 }
 522         }
 523
 524         /**
 525          * Set the latest revision
 526          */
 527         protected function setLastEdit( Revision $revision ) {
 528                 $this->mLastRevision = $revision;
 529                 $this->mTimestamp = $revision->getTimestamp();
 530         }
 531
 532         /**
 533          * Get the latest revision
 534          * @return Revision|null
 535          */
 536         public function getRevision() {
 537                 $this->loadLastEdit();
 538                 if ( $this->mLastRevision ) {
 539                         return $this->mLastRevision;
 540                 }
 541                 return null;
 542         }
 543
 544         /**
 545          * Get the text of the current revision. No side-effects...
 546          *
 547          * @param $audience Integer: one of:
 548          *      Revision::FOR_PUBLIC       to be displayed to all users
 549          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 550          *      Revision::RAW              get the text regardless of permissions
 551          * @return String|false The text of the current revision
 552          */
 553         public function getText( $audience = Revision::FOR_PUBLIC ) {
 554                 $this->loadLastEdit();
 555                 if ( $this->mLastRevision ) {
 556                         return $this->mLastRevision->getText( $audience );
 557                 }
 558                 return false;
 559         }
 560
 561         /**
 562          * Get the text of the current revision. No side-effects...
 563          *
 564          * @return String|false The text of the current revision
 565          */
 566         public function getRawText() {
 567                 $this->loadLastEdit();
 568                 if ( $this->mLastRevision ) {
 569                         return $this->mLastRevision->getRawText();
 570                 }
 571                 return false;
 572         }
 573
 574         /**
 575          * @return string MW timestamp of last article revision
 576          */
 577         public function getTimestamp() {
 578                 // Check if the field has been filled by WikiPage::setTimestamp()
 579                 if ( !$this->mTimestamp ) {
 580                         $this->loadLastEdit();
 581                 }
 582                 return wfTimestamp( TS_MW, $this->mTimestamp );
 583         }
 584
 585         /**
 586          * Set the page timestamp (use only to avoid DB queries)
 587          * @param $ts string MW timestamp of last article revision
 588          * @return void
 589          */
 590         public function setTimestamp( $ts ) {
 591                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 592         }
 593
 594         /**
 595          * @param $audience Integer: one of:
 596          *      Revision::FOR_PUBLIC       to be displayed to all users
 597          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 598          *      Revision::RAW              get the text regardless of permissions
 599          * @return int user ID for the user that made the last article revision
 600          */
 601         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 602                 $this->loadLastEdit();
 603                 if ( $this->mLastRevision ) {
 604                         return $this->mLastRevision->getUser( $audience );
 605                 } else {
 606                         return -1;
 607                 }
 608         }
 609
 610         /**
 611          * @param $audience Integer: one of:
 612          *      Revision::FOR_PUBLIC       to be displayed to all users
 613          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 614          *      Revision::RAW              get the text regardless of permissions
 615          * @return string username of the user that made the last article revision
 616          */
 617         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 618                 $this->loadLastEdit();
 619                 if ( $this->mLastRevision ) {
 620                         return $this->mLastRevision->getUserText( $audience );
 621                 } else {
 622                         return '';
 623                 }
 624         }
 625
 626         /**
 627          * @param $audience Integer: one of:
 628          *      Revision::FOR_PUBLIC       to be displayed to all users
 629          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 630          *      Revision::RAW              get the text regardless of permissions
 631          * @return string Comment stored for the last article revision
 632          */
 633         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 634                 $this->loadLastEdit();
 635                 if ( $this->mLastRevision ) {
 636                         return $this->mLastRevision->getComment( $audience );
 637                 } else {
 638                         return '';
 639                 }
 640         }
 641
 642         /**
 643          * Returns true if last revision was marked as "minor edit"
 644          *
 645          * @return boolean Minor edit indicator for the last article revision.
 646          */
 647         public function getMinorEdit() {
 648                 $this->loadLastEdit();
 649                 if ( $this->mLastRevision ) {
 650                         return $this->mLastRevision->isMinor();
 651                 } else {
 652                         return false;
 653                 }
 654         }
 655
 656         /**
 657          * Get a list of users who have edited this article, not including the user who made
 658          * the most recent revision, which you can get from $article->getUser() if you want it
 659          * @return UserArrayFromResult
 660          */
 661         public function getContributors() {
 662                 # @todo FIXME: This is expensive; cache this info somewhere.
 663
 664                 $dbr = wfGetDB( DB_SLAVE );
 665
 666                 if ( $dbr->implicitGroupby() ) {
 667                         $realNameField = 'user_real_name';
 668                 } else {
 669                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 670                 }
 671
 672                 $tables = array( 'revision', 'user' );
 673
 674                 $fields = array(
 675                         'rev_user as user_id',
 676                         'rev_user_text AS user_name',
 677                         $realNameField,
 678                         'MAX(rev_timestamp) AS timestamp',
 679                 );
 680
 681                 $conds = array( 'rev_page' => $this->getId() );
 682
 683                 // The user who made the top revision gets credited as "this page was last edited by
 684                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 685                 $user = $this->getUser();
 686                 if ( $user ) {
 687                         $conds[] = "rev_user != $user";
 688                 } else {
 689                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 690                 }
 691
 692                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 693
 694                 $jconds = array(
 695                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 696                 );
 697
 698                 $options = array(
 699                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 700                         'ORDER BY' => 'timestamp DESC',
 701                 );
 702
 703                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 704                 return new UserArrayFromResult( $res );
 705         }
 706
 707         /**
 708          * Should the parser cache be used?
 709          *
 710          * @param $user User The relevant user
 711          * @return boolean
 712          */
 713         public function isParserCacheUsed( User $user, $oldid ) {
 714                 global $wgEnableParserCache;
 715
 716                 return $wgEnableParserCache
 717                         && $user->getStubThreshold() == 0
 718                         && $this->exists()
 719                         && empty( $oldid )
 720                         && $this->mTitle->isWikitextPage();
 721         }
 722
 723         /**
 724          * Perform the actions of a page purging
 725          */
 726         public function doPurge() {
 727                 global $wgUseSquid;
 728
 729                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 730                         return false;
 731                 }
 732
 733                 // Invalidate the cache
 734                 $this->mTitle->invalidateCache();
 735                 $this->clear();
 736
 737                 if ( $wgUseSquid ) {
 738                         // Commit the transaction before the purge is sent
 739                         $dbw = wfGetDB( DB_MASTER );
 740                         $dbw->commit();
 741
 742                         // Send purge
 743                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 744                         $update->doUpdate();
 745                 }
 746
 747                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 748                         if ( $this->getId() == 0 ) {
 749                                 $text = false;
 750                         } else {
 751                                 $text = $this->getRawText();
 752                         }
 753
 754                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 755                 }
 756         }
 757
 758         /**
 759          * Insert a new empty page record for this article.
 760          * This *must* be followed up by creating a revision
 761          * and running $this->updateRevisionOn( ... );
 762          * or else the record will be left in a funky state.
 763          * Best if all done inside a transaction.
 764          *
 765          * @param $dbw DatabaseBase
 766          * @return int The newly created page_id key, or false if the title already existed
 767          * @private
 768          */
 769         public function insertOn( $dbw ) {
 770                 wfProfileIn( __METHOD__ );
 771
 772                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 773                 $dbw->insert( 'page', array(
 774                         'page_id'           => $page_id,
 775                         'page_namespace'    => $this->mTitle->getNamespace(),
 776                         'page_title'        => $this->mTitle->getDBkey(),
 777                         'page_counter'      => 0,
 778                         'page_restrictions' => '',
 779                         'page_is_redirect'  => 0, # Will set this shortly...
 780                         'page_is_new'       => 1,
 781                         'page_random'       => wfRandom(),
 782                         'page_touched'      => $dbw->timestamp(),
 783                         'page_latest'       => 0, # Fill this in shortly...
 784                         'page_len'          => 0, # Fill this in shortly...
 785                 ), __METHOD__, 'IGNORE' );
 786
 787                 $affected = $dbw->affectedRows();
 788
 789                 if ( $affected ) {
 790                         $newid = $dbw->insertId();
 791                         $this->mTitle->resetArticleID( $newid );
 792                 }
 793                 wfProfileOut( __METHOD__ );
 794
 795                 return $affected ? $newid : false;
 796         }
 797
 798         /**
 799          * Update the page record to point to a newly saved revision.
 800          *
 801          * @param $dbw DatabaseBase: object
 802          * @param $revision Revision: For ID number, and text used to set
 803          *                  length and redirect status fields
 804          * @param $lastRevision Integer: if given, will not overwrite the page field
 805          *                      when different from the currently set value.
 806          *                      Giving 0 indicates the new page flag should be set
 807          *                      on.
 808          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 809          *                           removing rows in redirect table.
 810          * @return bool true on success, false on failure
 811          * @private
 812          */
 813         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 814                 wfProfileIn( __METHOD__ );
 815
 816                 $text = $revision->getText();
 817                 $rt = Title::newFromRedirectRecurse( $text );
 818
 819                 $conditions = array( 'page_id' => $this->getId() );
 820
 821                 if ( !is_null( $lastRevision ) ) {
 822                         # An extra check against threads stepping on each other
 823                         $conditions['page_latest'] = $lastRevision;
 824                 }
 825
 826                 $now = wfTimestampNow();
 827                 $dbw->update( 'page',
 828                         array( /* SET */
 829                                 'page_latest'      => $revision->getId(),
 830                                 'page_touched'     => $dbw->timestamp( $now ),
 831                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 832                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 833                                 'page_len'         => strlen( $text ),
 834                         ),
 835                         $conditions,
 836                         __METHOD__ );
 837
 838                 $result = $dbw->affectedRows() != 0;
 839                 if ( $result ) {
 840                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 841                         $this->setCachedLastEditTime( $now );
 842                 }
 843
 844                 wfProfileOut( __METHOD__ );
 845                 return $result;
 846         }
 847
 848         /**
 849          * Get the cached timestamp for the last time the page changed.
 850          * This is only used to help handle slave lag by comparing to page_touched.
 851          * @return string MW timestamp
 852          */
 853         protected function getCachedLastEditTime() {
 854                 global $wgMemc;
 855                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 856                 return $wgMemc->get( $key );
 857         }
 858
 859         /**
 860          * Set the cached timestamp for the last time the page changed.
 861          * This is only used to help handle slave lag by comparing to page_touched.
 862          * @param $timestamp string
 863          * @return void
 864          */
 865         public function setCachedLastEditTime( $timestamp ) {
 866                 global $wgMemc;
 867                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 868                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 869         }
 870
 871         /**
 872          * Add row to the redirect table if this is a redirect, remove otherwise.
 873          *
 874          * @param $dbw DatabaseBase
 875          * @param $redirectTitle Title object pointing to the redirect target,
 876          *                       or NULL if this is not a redirect
 877          * @param $lastRevIsRedirect If given, will optimize adding and
 878          *                           removing rows in redirect table.
 879          * @return bool true on success, false on failure
 880          * @private
 881          */
 882         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 883                 // Always update redirects (target link might have changed)
 884                 // Update/Insert if we don't know if the last revision was a redirect or not
 885                 // Delete if changing from redirect to non-redirect
 886                 $isRedirect = !is_null( $redirectTitle );
 887
 888                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 889                         return true;
 890                 }
 891
 892                 wfProfileIn( __METHOD__ );
 893                 if ( $isRedirect ) {
 894                         $this->insertRedirectEntry( $redirectTitle );
 895                 } else {
 896                         // This is not a redirect, remove row from redirect table
 897                         $where = array( 'rd_from' => $this->getId() );
 898                         $dbw->delete( 'redirect', $where, __METHOD__ );
 899                 }
 900
 901                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 902                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 903                 }
 904                 wfProfileOut( __METHOD__ );
 905
 906                 return ( $dbw->affectedRows() != 0 );
 907         }
 908
 909         /**
 910          * If the given revision is newer than the currently set page_latest,
 911          * update the page record. Otherwise, do nothing.
 912          *
 913          * @param $dbw Database object
 914          * @param $revision Revision object
 915          * @return mixed
 916          */
 917         public function updateIfNewerOn( $dbw, $revision ) {
 918                 wfProfileIn( __METHOD__ );
 919
 920                 $row = $dbw->selectRow(
 921                         array( 'revision', 'page' ),
 922                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 923                         array(
 924                                 'page_id' => $this->getId(),
 925                                 'page_latest=rev_id' ),
 926                         __METHOD__ );
 927
 928                 if ( $row ) {
 929                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 930                                 wfProfileOut( __METHOD__ );
 931                                 return false;
 932                         }
 933                         $prev = $row->rev_id;
 934                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 935                 } else {
 936                         # No or missing previous revision; mark the page as new
 937                         $prev = 0;
 938                         $lastRevIsRedirect = null;
 939                 }
 940
 941                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 942
 943                 wfProfileOut( __METHOD__ );
 944                 return $ret;
 945         }
 946
 947         /**
 948          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 949          * @param $text String: new text of the section
 950          * @param $summary String: new section's subject, only if $section is 'new'
 951          * @param $edittime String: revision timestamp or null to use the current revision
 952          * @return string Complete article text, or null if error
 953          */
 954         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 955                 wfProfileIn( __METHOD__ );
 956
 957                 if ( strval( $section ) == '' ) {
 958                         // Whole-page edit; let the whole text through
 959                 } else {
 960                         if ( is_null( $edittime ) ) {
 961                                 $rev = Revision::newFromTitle( $this->mTitle );
 962                         } else {
 963                                 $dbw = wfGetDB( DB_MASTER );
 964                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 965                         }
 966
 967                         if ( !$rev ) {
 968                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 969                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 970                                 wfProfileOut( __METHOD__ );
 971                                 return null;
 972                         }
 973
 974                         $oldtext = $rev->getText();
 975
 976                         if ( $section == 'new' ) {
 977                                 # Inserting a new section
 978                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 979                                 $text = strlen( trim( $oldtext ) ) > 0
 980                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 981                                                 : "{$subject}{$text}";
 982                         } else {
 983                                 # Replacing an existing section; roll out the big guns
 984                                 global $wgParser;
 985
 986                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 987                         }
 988                 }
 989
 990                 wfProfileOut( __METHOD__ );
 991                 return $text;
 992         }
 993
 994         /**
 995          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 996          * @param $flags Int
 997          * @return Int updated $flags
 998          */
 999         function checkFlags( $flags ) {
1000                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1001                         if ( $this->mTitle->getArticleID() ) {
1002                                 $flags |= EDIT_UPDATE;
1003                         } else {
1004                                 $flags |= EDIT_NEW;
1005                         }
1006                 }
1007
1008                 return $flags;
1009         }
1010
1011         /**
1012          * Change an existing article or create a new article. Updates RC and all necessary caches,
1013          * optionally via the deferred update array.
1014          *
1015          * @param $text String: new text
1016          * @param $summary String: edit summary
1017          * @param $flags Integer bitfield:
1018          *      EDIT_NEW
1019          *          Article is known or assumed to be non-existent, create a new one
1020          *      EDIT_UPDATE
1021          *          Article is known or assumed to be pre-existing, update it
1022          *      EDIT_MINOR
1023          *          Mark this edit minor, if the user is allowed to do so
1024          *      EDIT_SUPPRESS_RC
1025          *          Do not log the change in recentchanges
1026          *      EDIT_FORCE_BOT
1027          *          Mark the edit a "bot" edit regardless of user rights
1028          *      EDIT_DEFER_UPDATES
1029          *          Defer some of the updates until the end of index.php
1030          *      EDIT_AUTOSUMMARY
1031          *          Fill in blank summaries with generated text where possible
1032          *
1033          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1034          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1035          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1036          * edit-already-exists error will be returned. These two conditions are also possible with
1037          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1038          *
1039          * @param $baseRevId the revision ID this edit was based off, if any
1040          * @param $user User the user doing the edit
1041          *
1042          * @return Status object. Possible errors:
1043          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1044          *     edit-gone-missing:       In update mode, but the article didn't exist
1045          *     edit-conflict:           In update mode, the article changed unexpectedly
1046          *     edit-no-change:          Warning that the text was the same as before
1047          *     edit-already-exists:     In creation mode, but the article already exists
1048          *
1049          *  Extensions may define additional errors.
1050          *
1051          *  $return->value will contain an associative array with members as follows:
1052          *     new:                     Boolean indicating if the function attempted to create a new article
1053          *     revision:                The revision object for the inserted revision, or null
1054          *
1055          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1056          */
1057         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1058                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1059
1060                 # Low-level sanity check
1061                 if ( $this->mTitle->getText() === '' ) {
1062                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1063                 }
1064
1065                 wfProfileIn( __METHOD__ );
1066
1067                 $user = is_null( $user ) ? $wgUser : $user;
1068                 $status = Status::newGood( array() );
1069
1070                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1071                 $this->loadPageData();
1072
1073                 $flags = $this->checkFlags( $flags );
1074
1075                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1076                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1077                 {
1078                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1079
1080                         if ( $status->isOK() ) {
1081                                 $status->fatal( 'edit-hook-aborted' );
1082                         }
1083
1084                         wfProfileOut( __METHOD__ );
1085                         return $status;
1086                 }
1087
1088                 # Silently ignore EDIT_MINOR if not allowed
1089                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1090                 $bot = $flags & EDIT_FORCE_BOT;
1091
1092                 $oldtext = $this->getRawText(); // current revision
1093                 $oldsize = strlen( $oldtext );
1094                 $oldcountable = $this->isCountable();
1095
1096                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1097                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1098                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1099                 }
1100
1101                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1102                 $text = $editInfo->pst;
1103                 $newsize = strlen( $text );
1104
1105                 $dbw = wfGetDB( DB_MASTER );
1106                 $now = wfTimestampNow();
1107                 $this->mTimestamp = $now;
1108
1109                 if ( $flags & EDIT_UPDATE ) {
1110                         # Update article, but only if changed.
1111                         $status->value['new'] = false;
1112
1113                         # Make sure the revision is either completely inserted or not inserted at all
1114                         if ( !$wgDBtransactions ) {
1115                                 $userAbort = ignore_user_abort( true );
1116                         }
1117
1118                         $revision = new Revision( array(
1119                                 'page'       => $this->getId(),
1120                                 'comment'    => $summary,
1121                                 'minor_edit' => $isminor,
1122                                 'text'       => $text,
1123                                 'parent_id'  => $this->mLatest,
1124                                 'user'       => $user->getId(),
1125                                 'user_text'  => $user->getName(),
1126                                 'timestamp'  => $now
1127                         ) );
1128
1129                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1130
1131                         if ( $changed ) {
1132                                 if ( !$this->mLatest ) {
1133                                         # Article gone missing
1134                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1135                                         $status->fatal( 'edit-gone-missing' );
1136
1137                                         wfProfileOut( __METHOD__ );
1138                                         return $status;
1139                                 }
1140
1141                                 $dbw->begin();
1142                                 $revisionId = $revision->insertOn( $dbw );
1143
1144                                 # Update page
1145                                 #
1146                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1147                                 # during the course of this function. This makes sure that EditPage can detect
1148                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1149                                 # before this function is called. A previous function used a separate query, this
1150                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1151                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1152
1153                                 if ( !$ok ) {
1154                                         /* Belated edit conflict! Run away!! */
1155                                         $status->fatal( 'edit-conflict' );
1156
1157                                         # Delete the invalid revision if the DB is not transactional
1158                                         if ( !$wgDBtransactions ) {
1159                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1160                                         }
1161
1162                                         $revisionId = 0;
1163                                         $dbw->rollback();
1164                                 } else {
1165                                         global $wgUseRCPatrol;
1166                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1167                                         # Update recentchanges
1168                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1169                                                 # Mark as patrolled if the user can do so
1170                                                 $patrolled = $wgUseRCPatrol && !count(
1171                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1172                                                 # Add RC row to the DB
1173                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1174                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1175                                                         $revisionId, $patrolled
1176                                                 );
1177
1178                                                 # Log auto-patrolled edits
1179                                                 if ( $patrolled ) {
1180                                                         PatrolLog::record( $rc, true );
1181                                                 }
1182                                         }
1183                                         $user->incEditCount();
1184                                         $dbw->commit();
1185                                 }
1186                         }
1187
1188                         if ( !$wgDBtransactions ) {
1189                                 ignore_user_abort( $userAbort );
1190                         }
1191
1192                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1193                         if ( !$status->isOK() ) {
1194                                 wfProfileOut( __METHOD__ );
1195                                 return $status;
1196                         }
1197
1198                         # Update links tables, site stats, etc.
1199                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1200                                 'oldcountable' => $oldcountable ) );
1201
1202                         if ( !$changed ) {
1203                                 $status->warning( 'edit-no-change' );
1204                                 $revision = null;
1205                                 // Keep the same revision ID, but do some updates on it
1206                                 $revisionId = $this->getLatest();
1207                                 // Update page_touched, this is usually implicit in the page update
1208                                 // Other cache updates are done in onArticleEdit()
1209                                 $this->mTitle->invalidateCache();
1210                         }
1211                 } else {
1212                         # Create new article
1213                         $status->value['new'] = true;
1214
1215                         $dbw->begin();
1216
1217                         # Add the page record; stake our claim on this title!
1218                         # This will return false if the article already exists
1219                         $newid = $this->insertOn( $dbw );
1220
1221                         if ( $newid === false ) {
1222                                 $dbw->rollback();
1223                                 $status->fatal( 'edit-already-exists' );
1224
1225                                 wfProfileOut( __METHOD__ );
1226                                 return $status;
1227                         }
1228
1229                         # Save the revision text...
1230                         $revision = new Revision( array(
1231                                 'page'       => $newid,
1232                                 'comment'    => $summary,
1233                                 'minor_edit' => $isminor,
1234                                 'text'       => $text,
1235                                 'user'       => $user->getId(),
1236                                 'user_text'  => $user->getName(),
1237                                 'timestamp'  => $now
1238                         ) );
1239                         $revisionId = $revision->insertOn( $dbw );
1240
1241                         $this->mTitle->resetArticleID( $newid );
1242                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1243                         # @todo FIXME?
1244                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1245
1246                         # Update the page record with revision data
1247                         $this->updateRevisionOn( $dbw, $revision, 0 );
1248
1249                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1250
1251                         # Update recentchanges
1252                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1253                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1254
1255                                 # Mark as patrolled if the user can do so
1256                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1257                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1258                                 # Add RC row to the DB
1259                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1260                                         '', strlen( $text ), $revisionId, $patrolled );
1261
1262                                 # Log auto-patrolled edits
1263                                 if ( $patrolled ) {
1264                                         PatrolLog::record( $rc, true );
1265                                 }
1266                         }
1267                         $user->incEditCount();
1268                         $dbw->commit();
1269
1270                         # Update links, etc.
1271                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1272
1273                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1274                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1275                 }
1276
1277                 # Do updates right now unless deferral was requested
1278                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1279                         DeferredUpdates::doUpdates();
1280                 }
1281
1282                 // Return the new revision (or null) to the caller
1283                 $status->value['revision'] = $revision;
1284
1285                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1286                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1287
1288                 # Promote user to any groups they meet the criteria for
1289                 $user->addAutopromoteOnceGroups( 'onEdit' );
1290
1291                 wfProfileOut( __METHOD__ );
1292                 return $status;
1293         }
1294
1295         /**
1296          * Update the article's restriction field, and leave a log entry.
1297          *
1298          * @todo: seperate the business/permission stuff out from backend code
1299          *
1300          * @param $limit Array: set of restriction keys
1301          * @param $reason String
1302          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1303          * @param $expiry Array: per restriction type expiration
1304          * @param $user User The user updating the restrictions
1305          * @return bool true on success
1306          */
1307         public function updateRestrictions(
1308                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1309         ) {
1310                 global $wgUser, $wgContLang;
1311                 $user = is_null( $user ) ? $wgUser : $user;
1312
1313                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1314
1315                 $id = $this->mTitle->getArticleID();
1316
1317                 if ( $id <= 0 ) {
1318                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1319                         return false;
1320                 }
1321
1322                 if ( wfReadOnly() ) {
1323                         wfDebug( "updateRestrictions failed: read-only\n" );
1324                         return false;
1325                 }
1326
1327                 if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
1328                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1329                         return false;
1330                 }
1331
1332                 if ( !$cascade ) {
1333                         $cascade = false;
1334                 }
1335
1336                 // Take this opportunity to purge out expired restrictions
1337                 Title::purgeExpiredRestrictions();
1338
1339                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1340                 # we expect a single selection, but the schema allows otherwise.
1341                 $current = array();
1342                 $updated = self::flattenRestrictions( $limit );
1343                 $changed = false;
1344
1345                 foreach ( $restrictionTypes as $action ) {
1346                         if ( isset( $expiry[$action] ) ) {
1347                                 # Get current restrictions on $action
1348                                 $aLimits = $this->mTitle->getRestrictions( $action );
1349                                 $current[$action] = implode( '', $aLimits );
1350                                 # Are any actual restrictions being dealt with here?
1351                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1352
1353                                 # If something changed, we need to log it. Checking $aRChanged
1354                                 # assures that "unprotecting" a page that is not protected does
1355                                 # not log just because the expiry was "changed".
1356                                 if ( $aRChanged &&
1357                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1358                                 {
1359                                         $changed = true;
1360                                 }
1361                         }
1362                 }
1363
1364                 $current = self::flattenRestrictions( $current );
1365
1366                 $changed = ( $changed || $current != $updated );
1367                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1368                 $protect = ( $updated != '' );
1369
1370                 # If nothing's changed, do nothing
1371                 if ( $changed ) {
1372                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1373                                 $dbw = wfGetDB( DB_MASTER );
1374
1375                                 # Prepare a null revision to be added to the history
1376                                 $modified = $current != '' && $protect;
1377
1378                                 if ( $protect ) {
1379                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1380                                 } else {
1381                                         $comment_type = 'unprotectedarticle';
1382                                 }
1383
1384                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1385
1386                                 # Only restrictions with the 'protect' right can cascade...
1387                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1388                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1389
1390                                 # The schema allows multiple restrictions
1391                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1392                                         $cascade = false;
1393                                 }
1394
1395                                 $cascade_description = '';
1396
1397                                 if ( $cascade ) {
1398                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1399                                 }
1400
1401                                 if ( $reason ) {
1402                                         $comment .= ": $reason";
1403                                 }
1404
1405                                 $editComment = $comment;
1406                                 $encodedExpiry = array();
1407                                 $protect_description = '';
1408                                 foreach ( $limit as $action => $restrictions ) {
1409                                         if ( !isset( $expiry[$action] ) )
1410                                                 $expiry[$action] = $dbw->getInfinity();
1411
1412                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1413                                         if ( $restrictions != '' ) {
1414                                                 $protect_description .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1415                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1416                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1417                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1418                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1419                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1420                                                 } else {
1421                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1422                                                 }
1423
1424                                                 $protect_description .= ') ';
1425                                         }
1426                                 }
1427                                 $protect_description = trim( $protect_description );
1428
1429                                 if ( $protect_description && $protect ) {
1430                                         $editComment .= " ($protect_description)";
1431                                 }
1432
1433                                 if ( $cascade ) {
1434                                         $editComment .= "$cascade_description";
1435                                 }
1436
1437                                 # Update restrictions table
1438                                 foreach ( $limit as $action => $restrictions ) {
1439                                         if ( $restrictions != '' ) {
1440                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1441                                                         array( 'pr_page' => $id,
1442                                                                 'pr_type' => $action,
1443                                                                 'pr_level' => $restrictions,
1444                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1445                                                                 'pr_expiry' => $encodedExpiry[$action]
1446                                                         ),
1447                                                         __METHOD__
1448                                                 );
1449                                         } else {
1450                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1451                                                         'pr_type' => $action ), __METHOD__ );
1452                                         }
1453                                 }
1454
1455                                 # Insert a null revision
1456                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1457                                 $nullRevId = $nullRevision->insertOn( $dbw );
1458
1459                                 $latest = $this->getLatest();
1460                                 # Update page record
1461                                 $dbw->update( 'page',
1462                                         array( /* SET */
1463                                                 'page_touched' => $dbw->timestamp(),
1464                                                 'page_restrictions' => '',
1465                                                 'page_latest' => $nullRevId
1466                                         ), array( /* WHERE */
1467                                                 'page_id' => $id
1468                                         ), __METHOD__
1469                                 );
1470
1471                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1472                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1473
1474                                 # Update the protection log
1475                                 $log = new LogPage( 'protect' );
1476                                 if ( $protect ) {
1477                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1478                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1479                                 } else {
1480                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1481                                 }
1482                         } # End hook
1483                 } # End "changed" check
1484
1485                 return true;
1486         }
1487
1488         /**
1489          * Take an array of page restrictions and flatten it to a string
1490          * suitable for insertion into the page_restrictions field.
1491          * @param $limit Array
1492          * @return String
1493          */
1494         protected static function flattenRestrictions( $limit ) {
1495                 if ( !is_array( $limit ) ) {
1496                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1497                 }
1498
1499                 $bits = array();
1500                 ksort( $limit );
1501
1502                 foreach ( $limit as $action => $restrictions ) {
1503                         if ( $restrictions != '' ) {
1504                                 $bits[] = "$action=$restrictions";
1505                         }
1506                 }
1507
1508                 return implode( ':', $bits );
1509         }
1510
1511         /**
1512          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1513          */
1514         public function isBigDeletion() {
1515                 global $wgDeleteRevisionsLimit;
1516
1517                 if ( $wgDeleteRevisionsLimit ) {
1518                         $revCount = $this->estimateRevisionCount();
1519
1520                         return $revCount > $wgDeleteRevisionsLimit;
1521                 }
1522
1523                 return false;
1524         }
1525
1526         /**
1527          * @return int approximate revision count
1528          */
1529         public function estimateRevisionCount() {
1530                 $dbr = wfGetDB( DB_SLAVE );
1531
1532                 // For an exact count...
1533                 // return $dbr->selectField( 'revision', 'COUNT(*)',
1534                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
1535                 return $dbr->estimateRowCount( 'revision', '*',
1536                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1537         }
1538
1539         /**
1540          * Get the last N authors
1541          * @param $num Integer: number of revisions to get
1542          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1543          * @return array Array of authors, duplicates not removed
1544          */
1545         public function getLastNAuthors( $num, $revLatest = 0 ) {
1546                 wfProfileIn( __METHOD__ );
1547                 // First try the slave
1548                 // If that doesn't have the latest revision, try the master
1549                 $continue = 2;
1550                 $db = wfGetDB( DB_SLAVE );
1551
1552                 do {
1553                         $res = $db->select( array( 'page', 'revision' ),
1554                                 array( 'rev_id', 'rev_user_text' ),
1555                                 array(
1556                                         'page_namespace' => $this->mTitle->getNamespace(),
1557                                         'page_title' => $this->mTitle->getDBkey(),
1558                                         'rev_page = page_id'
1559                                 ), __METHOD__,
1560                                 array(
1561                                         'ORDER BY' => 'rev_timestamp DESC',
1562                                         'LIMIT' => $num
1563                                 )
1564                         );
1565
1566                         if ( !$res ) {
1567                                 wfProfileOut( __METHOD__ );
1568                                 return array();
1569                         }
1570
1571                         $row = $db->fetchObject( $res );
1572
1573                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1574                                 $db = wfGetDB( DB_MASTER );
1575                                 $continue--;
1576                         } else {
1577                                 $continue = 0;
1578                         }
1579                 } while ( $continue );
1580
1581                 $authors = array( $row->rev_user_text );
1582
1583                 foreach ( $res as $row ) {
1584                         $authors[] = $row->rev_user_text;
1585                 }
1586
1587                 wfProfileOut( __METHOD__ );
1588                 return $authors;
1589         }
1590
1591         /**
1592          * Back-end article deletion
1593          * Deletes the article with database consistency, writes logs, purges caches
1594          *
1595          * @param $reason string delete reason for deletion log
1596          * @param suppress bitfield
1597          *      Revision::DELETED_TEXT
1598          *      Revision::DELETED_COMMENT
1599          *      Revision::DELETED_USER
1600          *      Revision::DELETED_RESTRICTED
1601          * @param $id int article ID
1602          * @param $commit boolean defaults to true, triggers transaction end
1603          * @param &$errors Array of errors to append to
1604          * @param $user User The relevant user
1605          * @return boolean true if successful
1606          */
1607         public function doDeleteArticle(
1608                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1609         ) {
1610                 global $wgUseTrackbacks, $wgEnableInterwikiTemplatesTracking, $wgGlobalDatabase, $wgUser;
1611                 $user = is_null( $user ) ? $wgUser : $user;
1612
1613                 wfDebug( __METHOD__ . "\n" );
1614
1615                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1616                         return false;
1617                 }
1618                 $dbw = wfGetDB( DB_MASTER );
1619                 $t = $this->mTitle->getDBkey();
1620                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1621
1622                 if ( $t === '' || $id == 0 ) {
1623                         return false;
1624                 }
1625
1626                 DeferredUpdates::addUpdate(
1627                         new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 )
1628                 );
1629
1630                 // Bitfields to further suppress the content
1631                 if ( $suppress ) {
1632                         $bitfield = 0;
1633                         // This should be 15...
1634                         $bitfield |= Revision::DELETED_TEXT;
1635                         $bitfield |= Revision::DELETED_COMMENT;
1636                         $bitfield |= Revision::DELETED_USER;
1637                         $bitfield |= Revision::DELETED_RESTRICTED;
1638                 } else {
1639                         $bitfield = 'rev_deleted';
1640                 }
1641
1642                 $dbw->begin();
1643                 // For now, shunt the revision data into the archive table.
1644                 // Text is *not* removed from the text table; bulk storage
1645                 // is left intact to avoid breaking block-compression or
1646                 // immutable storage schemes.
1647                 //
1648                 // For backwards compatibility, note that some older archive
1649                 // table entries will have ar_text and ar_flags fields still.
1650                 //
1651                 // In the future, we may keep revisions and mark them with
1652                 // the rev_deleted field, which is reserved for this purpose.
1653                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1654                         array(
1655                                 'ar_namespace'  => 'page_namespace',
1656                                 'ar_title'      => 'page_title',
1657                                 'ar_comment'    => 'rev_comment',
1658                                 'ar_user'       => 'rev_user',
1659                                 'ar_user_text'  => 'rev_user_text',
1660                                 'ar_timestamp'  => 'rev_timestamp',
1661                                 'ar_minor_edit' => 'rev_minor_edit',
1662                                 'ar_rev_id'     => 'rev_id',
1663                                 'ar_parent_id'  => 'rev_parent_id',
1664                                 'ar_text_id'    => 'rev_text_id',
1665                                 'ar_text'       => '\'\'', // Be explicit to appease
1666                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1667                                 'ar_len'        => 'rev_len',
1668                                 'ar_page_id'    => 'page_id',
1669                                 'ar_deleted'    => $bitfield
1670                         ), array(
1671                                 'page_id' => $id,
1672                                 'page_id = rev_page'
1673                         ), __METHOD__
1674                 );
1675
1676                 # Delete restrictions for it
1677                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1678
1679                 # Now that it's safely backed up, delete it
1680                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1681                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1682
1683                 if ( !$ok ) {
1684                         $dbw->rollback();
1685                         return false;
1686                 }
1687
1688                 # Fix category table counts
1689                 $cats = array();
1690                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1691
1692                 foreach ( $res as $row ) {
1693                         $cats [] = $row->cl_to;
1694                 }
1695
1696                 $this->updateCategoryCounts( array(), $cats );
1697
1698                 # If using cascading deletes, we can skip some explicit deletes
1699                 if ( !$dbw->cascadingDeletes() ) {
1700                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1701
1702                         if ( $wgUseTrackbacks ) {
1703                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1704                         }
1705
1706                         # Delete outgoing links
1707                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
1708                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
1709                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
1710                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
1711                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
1712                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
1713                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
1714                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
1715                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
1716
1717                         if ( $wgEnableInterwikiTemplatesTracking && $wgGlobalDatabase ) {
1718                                 $dbw2 = wfGetDB( DB_MASTER, array(), $wgGlobalDatabase );
1719                                 $dbw2->delete( 'globaltemplatelinks',
1720                                                         array(  'gtl_from_wiki' => wfGetID(),
1721                                                                         'gtl_from_page' => $id )
1722                                                         );
1723                 }
1724                 }
1725
1726                 # If using cleanup triggers, we can skip some manual deletes
1727                 if ( !$dbw->cleanupTriggers() ) {
1728                         # Clean up recentchanges entries...
1729                         $dbw->delete( 'recentchanges',
1730                                 array( 'rc_type != ' . RC_LOG,
1731                                         'rc_namespace' => $this->mTitle->getNamespace(),
1732                                         'rc_title' => $this->mTitle->getDBkey() ),
1733                                 __METHOD__ );
1734                         $dbw->delete( 'recentchanges',
1735                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1736                                 __METHOD__ );
1737                 }
1738
1739                 # Clear caches
1740                 self::onArticleDelete( $this->mTitle );
1741
1742                 # Clear the cached article id so the interface doesn't act like we exist
1743                 $this->mTitle->resetArticleID( 0 );
1744
1745                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1746                 $logtype = $suppress ? 'suppress' : 'delete';
1747
1748                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
1749                 $logEntry->setPerformer( $user );
1750                 $logEntry->setTarget( $this->mTitle );
1751                 $logEntry->setComment( $reason );
1752                 $logid = $logEntry->insert();
1753                 $logEntry->publish( $logid );
1754
1755                 if ( $commit ) {
1756                         $dbw->commit();
1757                 }
1758
1759                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1760                 return true;
1761         }
1762
1763         /**
1764          * Roll back the most recent consecutive set of edits to a page
1765          * from the same user; fails if there are no eligible edits to
1766          * roll back to, e.g. user is the sole contributor. This function
1767          * performs permissions checks on $user, then calls commitRollback()
1768          * to do the dirty work
1769          *
1770          * @param $fromP String: Name of the user whose edits to rollback.
1771          * @param $summary String: Custom summary. Set to default summary if empty.
1772          * @param $token String: Rollback token.
1773          * @param $bot Boolean: If true, mark all reverted edits as bot.
1774          *
1775          * @param $resultDetails Array: contains result-specific array of additional values
1776          *    'alreadyrolled' : 'current' (rev)
1777          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1778          *
1779          * @param $user User The user performing the rollback
1780          * @return array of errors, each error formatted as
1781          *   array(messagekey, param1, param2, ...).
1782          * On success, the array is empty.  This array can also be passed to
1783          * OutputPage::showPermissionsErrorPage().
1784          */
1785         public function doRollback(
1786                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1787         ) {
1788                 $resultDetails = null;
1789
1790                 # Check permissions
1791                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1792                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1793                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1794
1795                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1796                         $errors[] = array( 'sessionfailure' );
1797                 }
1798
1799                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1800                         $errors[] = array( 'actionthrottledtext' );
1801                 }
1802
1803                 # If there were errors, bail out now
1804                 if ( !empty( $errors ) ) {
1805                         return $errors;
1806                 }
1807
1808                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1809         }
1810
1811         /**
1812          * Backend implementation of doRollback(), please refer there for parameter
1813          * and return value documentation
1814          *
1815          * NOTE: This function does NOT check ANY permissions, it just commits the
1816          * rollback to the DB. Therefore, you should only call this function direct-
1817          * ly if you want to use custom permissions checks. If you don't, use
1818          * doRollback() instead.
1819          * @param $fromP String: Name of the user whose edits to rollback.
1820          * @param $summary String: Custom summary. Set to default summary if empty.
1821          * @param $bot Boolean: If true, mark all reverted edits as bot.
1822          *
1823          * @param $resultDetails Array: contains result-specific array of additional values
1824          * @param $guser User The user performing the rollback
1825          */
1826         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1827                 global $wgUseRCPatrol, $wgContLang;
1828
1829                 $dbw = wfGetDB( DB_MASTER );
1830
1831                 if ( wfReadOnly() ) {
1832                         return array( array( 'readonlytext' ) );
1833                 }
1834
1835                 # Get the last editor
1836                 $current = Revision::newFromTitle( $this->mTitle );
1837                 if ( is_null( $current ) ) {
1838                         # Something wrong... no page?
1839                         return array( array( 'notanarticle' ) );
1840                 }
1841
1842                 $from = str_replace( '_', ' ', $fromP );
1843                 # User name given should match up with the top revision.
1844                 # If the user was deleted then $from should be empty.
1845                 if ( $from != $current->getUserText() ) {
1846                         $resultDetails = array( 'current' => $current );
1847                         return array( array( 'alreadyrolled',
1848                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1849                                 htmlspecialchars( $fromP ),
1850                                 htmlspecialchars( $current->getUserText() )
1851                         ) );
1852                 }
1853
1854                 # Get the last edit not by this guy...
1855                 # Note: these may not be public values
1856                 $user = intval( $current->getRawUser() );
1857                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1858                 $s = $dbw->selectRow( 'revision',
1859                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1860                         array( 'rev_page' => $current->getPage(),
1861                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1862                         ), __METHOD__,
1863                         array( 'USE INDEX' => 'page_timestamp',
1864                                 'ORDER BY' => 'rev_timestamp DESC' )
1865                         );
1866                 if ( $s === false ) {
1867                         # No one else ever edited this page
1868                         return array( array( 'cantrollback' ) );
1869                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1870                         # Only admins can see this text
1871                         return array( array( 'notvisiblerev' ) );
1872                 }
1873
1874                 $set = array();
1875                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1876                         # Mark all reverted edits as bot
1877                         $set['rc_bot'] = 1;
1878                 }
1879
1880                 if ( $wgUseRCPatrol ) {
1881                         # Mark all reverted edits as patrolled
1882                         $set['rc_patrolled'] = 1;
1883                 }
1884
1885                 if ( count( $set ) ) {
1886                         $dbw->update( 'recentchanges', $set,
1887                                 array( /* WHERE */
1888                                         'rc_cur_id' => $current->getPage(),
1889                                         'rc_user_text' => $current->getUserText(),
1890                                         "rc_timestamp > '{$s->rev_timestamp}'",
1891                                 ), __METHOD__
1892                         );
1893                 }
1894
1895                 # Generate the edit summary if necessary
1896                 $target = Revision::newFromId( $s->rev_id );
1897                 if ( empty( $summary ) ) {
1898                         if ( $from == '' ) { // no public user name
1899                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1900                         } else {
1901                                 $summary = wfMsgForContent( 'revertpage' );
1902                         }
1903                 }
1904
1905                 # Allow the custom summary to use the same args as the default message
1906                 $args = array(
1907                         $target->getUserText(), $from, $s->rev_id,
1908                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1909                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1910                 );
1911                 $summary = wfMsgReplaceArgs( $summary, $args );
1912
1913                 # Save
1914                 $flags = EDIT_UPDATE;
1915
1916                 if ( $guser->isAllowed( 'minoredit' ) ) {
1917                         $flags |= EDIT_MINOR;
1918                 }
1919
1920                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1921                         $flags |= EDIT_FORCE_BOT;
1922                 }
1923
1924                 # Actually store the edit
1925                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1926                 if ( !empty( $status->value['revision'] ) ) {
1927                         $revId = $status->value['revision']->getId();
1928                 } else {
1929                         $revId = false;
1930                 }
1931
1932                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1933
1934                 $resultDetails = array(
1935                         'summary' => $summary,
1936                         'current' => $current,
1937                         'target'  => $target,
1938                         'newid'   => $revId
1939                 );
1940
1941                 return array();
1942         }
1943
1944         /**
1945          * Do standard deferred updates after page view
1946          * @param $user User The relevant user
1947          */
1948         public function doViewUpdates( User $user ) {
1949                 global $wgDisableCounters;
1950                 if ( wfReadOnly() ) {
1951                         return;
1952                 }
1953
1954                 # Don't update page view counters on views from bot users (bug 14044)
1955                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1956                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1957                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1958                 }
1959
1960                 # Update newtalk / watchlist notification status
1961                 $user->clearNotification( $this->mTitle );
1962         }
1963
1964         /**
1965          * Prepare text which is about to be saved.
1966          * Returns a stdclass with source, pst and output members
1967          */
1968         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1969                 global $wgParser, $wgUser;
1970                 $user = is_null( $user ) ? $wgUser : $user;
1971                 // @TODO fixme: check $user->getId() here???
1972                 if ( $this->mPreparedEdit
1973                         && $this->mPreparedEdit->newText == $text
1974                         && $this->mPreparedEdit->revid == $revid
1975                 ) {
1976                         // Already prepared
1977                         return $this->mPreparedEdit;
1978                 }
1979
1980                 $popts = ParserOptions::newFromUser( $user );
1981                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1982
1983                 $edit = (object)array();
1984                 $edit->revid = $revid;
1985                 $edit->newText = $text;
1986                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1987                 $edit->popts = $this->getParserOptions( true );
1988                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1989                 $edit->oldText = $this->getRawText();
1990
1991                 $this->mPreparedEdit = $edit;
1992
1993                 return $edit;
1994         }
1995
1996         /**
1997          * Do standard deferred updates after page edit.
1998          * Update links tables, site stats, search index and message cache.
1999          * Purges pages that include this page if the text was changed here.
2000          * Every 100th edit, prune the recent changes table.
2001          *
2002          * @private
2003          * @param $revision Revision object
2004          * @param $user User object that did the revision
2005          * @param $options Array of options, following indexes are used:
2006          * - changed: boolean, whether the revision changed the content (default true)
2007          * - created: boolean, whether the revision created the page (default false)
2008          * - oldcountable: boolean or null (default null):
2009          *   - boolean: whether the page was counted as an article before that
2010          *     revision, only used in changed is true and created is false
2011          *   - null: don't change the article count
2012          */
2013         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2014                 global $wgEnableParserCache;
2015
2016                 wfProfileIn( __METHOD__ );
2017
2018                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2019                 $text = $revision->getText();
2020
2021                 # Parse the text
2022                 # Be careful not to double-PST: $text is usually already PST-ed once
2023                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2024                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2025                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
2026                 } else {
2027                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2028                         $editInfo = $this->mPreparedEdit;
2029                 }
2030
2031                 # Save it to the parser cache
2032                 if ( $wgEnableParserCache ) {
2033                         $parserCache = ParserCache::singleton();
2034                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2035                 }
2036
2037                 # Update the links tables
2038                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2039                 $u->doUpdate();
2040
2041                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2042
2043                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2044                         if ( 0 == mt_rand( 0, 99 ) ) {
2045                                 // Flush old entries from the `recentchanges` table; we do this on
2046                                 // random requests so as to avoid an increase in writes for no good reason
2047                                 global $wgRCMaxAge;
2048
2049                                 $dbw = wfGetDB( DB_MASTER );
2050                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2051                                 $dbw->delete(
2052                                         'recentchanges',
2053                                         array( "rc_timestamp < '$cutoff'" ),
2054                                         __METHOD__
2055                                 );
2056                         }
2057                 }
2058
2059                 $id = $this->getId();
2060                 $title = $this->mTitle->getPrefixedDBkey();
2061                 $shortTitle = $this->mTitle->getDBkey();
2062
2063                 if ( 0 == $id ) {
2064                         wfProfileOut( __METHOD__ );
2065                         return;
2066                 }
2067
2068                 if ( !$options['changed'] ) {
2069                         $good = 0;
2070                         $total = 0;
2071                 } elseif ( $options['created'] ) {
2072                         $good = (int)$this->isCountable( $editInfo );
2073                         $total = 1;
2074                 } elseif ( $options['oldcountable'] !== null ) {
2075                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2076                         $total = 0;
2077                 } else {
2078                         $good = 0;
2079                         $total = 0;
2080                 }
2081
2082                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2083                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
2084
2085                 # If this is another user's talk page, update newtalk.
2086                 # Don't do this if $options['changed'] = false (null-edits) nor if
2087                 # it's a minor edit and the user doesn't want notifications for those.
2088                 if ( $options['changed']
2089                         && $this->mTitle->getNamespace() == NS_USER_TALK
2090                         && $shortTitle != $user->getTitleKey()
2091                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2092                 ) {
2093                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2094                                 $other = User::newFromName( $shortTitle, false );
2095                                 if ( !$other ) {
2096                                         wfDebug( __METHOD__ . ": invalid username\n" );
2097                                 } elseif ( User::isIP( $shortTitle ) ) {
2098                                         // An anonymous user
2099                                         $other->setNewtalk( true );
2100                                 } elseif ( $other->isLoggedIn() ) {
2101                                         $other->setNewtalk( true );
2102                                 } else {
2103                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2104                                 }
2105                         }
2106                 }
2107
2108                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2109                         MessageCache::singleton()->replace( $shortTitle, $text );
2110                 }
2111
2112                 if( $options['created'] ) {
2113                         self::onArticleCreate( $this->mTitle );
2114                 } else {
2115                         self::onArticleEdit( $this->mTitle );
2116                 }
2117
2118                 wfProfileOut( __METHOD__ );
2119         }
2120
2121         /**
2122          * Perform article updates on a special page creation.
2123          *
2124          * @param $rev Revision object
2125          *
2126          * @todo This is a shitty interface function. Kill it and replace the
2127          * other shitty functions like doEditUpdates and such so it's not needed
2128          * anymore.
2129          * @deprecated since 1.18, use doEditUpdates()
2130          */
2131         public function createUpdates( $rev ) {
2132                 global $wgUser;
2133                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2134         }
2135
2136         /**
2137          * This function is called right before saving the wikitext,
2138          * so we can do things like signatures and links-in-context.
2139          *
2140          * @param $text String article contents
2141          * @param $user User object: user doing the edit
2142          * @param $popts ParserOptions object: parser options, default options for
2143          *               the user loaded if null given
2144          * @return string article contents with altered wikitext markup (signatures
2145          *      converted, {{subst:}}, templates, etc.)
2146          */
2147         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2148                 global $wgParser, $wgUser;
2149                 $user = is_null( $user ) ? $wgUser : $user;
2150
2151                 if ( $popts === null ) {
2152                         $popts = ParserOptions::newFromUser( $user );
2153                 }
2154
2155                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2156         }
2157
2158         /**
2159          * Loads page_touched and returns a value indicating if it should be used
2160          * @return boolean true if not a redirect
2161          */
2162         public function checkTouched() {
2163                 if ( !$this->mDataLoaded ) {
2164                         $this->loadPageData();
2165                 }
2166                 return !$this->mIsRedirect;
2167         }
2168
2169         /**
2170          * Get the page_touched field
2171          * @return string containing GMT timestamp
2172          */
2173         public function getTouched() {
2174                 if ( !$this->mDataLoaded ) {
2175                         $this->loadPageData();
2176                 }
2177                 return $this->mTouched;
2178         }
2179
2180         /**
2181          * Get the page_latest field
2182          * @return integer rev_id of current revision
2183          */
2184         public function getLatest() {
2185                 if ( !$this->mDataLoaded ) {
2186                         $this->loadPageData();
2187                 }
2188                 return (int)$this->mLatest;
2189         }
2190
2191         /**
2192          * Edit an article without doing all that other stuff
2193          * The article must already exist; link tables etc
2194          * are not updated, caches are not flushed.
2195          *
2196          * @param $text String: text submitted
2197          * @param $user User The relevant user
2198          * @param $comment String: comment submitted
2199          * @param $minor Boolean: whereas it's a minor modification
2200          */
2201         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2202                 wfProfileIn( __METHOD__ );
2203
2204                 $dbw = wfGetDB( DB_MASTER );
2205                 $revision = new Revision( array(
2206                         'page'       => $this->getId(),
2207                         'text'       => $text,
2208                         'comment'    => $comment,
2209                         'minor_edit' => $minor ? 1 : 0,
2210                 ) );
2211                 $revision->insertOn( $dbw );
2212                 $this->updateRevisionOn( $dbw, $revision );
2213
2214                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2215
2216                 wfProfileOut( __METHOD__ );
2217         }
2218
2219         /**
2220          * The onArticle*() functions are supposed to be a kind of hooks
2221          * which should be called whenever any of the specified actions
2222          * are done.
2223          *
2224          * This is a good place to put code to clear caches, for instance.
2225          *
2226          * This is called on page move and undelete, as well as edit
2227          *
2228          * @param $title Title object
2229          */
2230         public static function onArticleCreate( $title ) {
2231                 # Update existence markers on article/talk tabs...
2232                 if ( $title->isTalkPage() ) {
2233                         $other = $title->getSubjectPage();
2234                 } else {
2235                         $other = $title->getTalkPage();
2236                 }
2237
2238                 $other->invalidateCache();
2239                 $other->purgeSquid();
2240
2241                 $title->touchLinks();
2242                 $title->purgeSquid();
2243                 $title->deleteTitleProtection();
2244
2245                 # Invalidate caches of distant articles which transclude this page
2246                 DeferredUpdates::addHTMLCacheUpdate( $title, 'globaltemplatelinks' );
2247         }
2248
2249         /**
2250          * Clears caches when article is deleted
2251          *
2252          * @param $title Title
2253          */
2254         public static function onArticleDelete( $title ) {
2255                 # Update existence markers on article/talk tabs...
2256                 if ( $title->isTalkPage() ) {
2257                         $other = $title->getSubjectPage();
2258                 } else {
2259                         $other = $title->getTalkPage();
2260                 }
2261
2262                 $other->invalidateCache();
2263                 $other->purgeSquid();
2264
2265                 $title->touchLinks();
2266                 $title->purgeSquid();
2267
2268                 # File cache
2269                 HTMLFileCache::clearFileCache( $title );
2270
2271                 # Messages
2272                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2273                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2274                 }
2275
2276                 # Images
2277                 if ( $title->getNamespace() == NS_FILE ) {
2278                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2279                         $update->doUpdate();
2280                 }
2281
2282                 # User talk pages
2283                 if ( $title->getNamespace() == NS_USER_TALK ) {
2284                         $user = User::newFromName( $title->getText(), false );
2285                         $user->setNewtalk( false );
2286                 }
2287
2288                 # Image redirects
2289                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2290
2291                 # Invalidate caches of distant articles which transclude this page
2292                 DeferredUpdates::addHTMLCacheUpdate( $title, 'globaltemplatelinks' );
2293         }
2294
2295         /**
2296          * Purge caches on page update etc
2297          *
2298          * @param $title Title object
2299          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2300          */
2301         public static function onArticleEdit( $title ) {
2302                 // Invalidate caches of articles which include this page
2303                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2304
2305                 // Invalidate caches of distant articles which transclude this page
2306                 DeferredUpdates::addHTMLCacheUpdate( $title, 'globaltemplatelinks' );
2307
2308                 // Invalidate the caches of all pages which redirect here
2309                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2310
2311                 # Purge squid for this page only
2312                 $title->purgeSquid();
2313
2314                 # Clear file cache for this page only
2315                 HTMLFileCache::clearFileCache( $title );
2316         }
2317
2318         /**#@-*/
2319
2320         /**
2321          * Return a list of templates used by this article.
2322          * Uses the templatelinks table
2323          *
2324          * @return Array of Title objects
2325          */
2326         public function getUsedTemplates() {
2327                 $result = array();
2328                 $id = $this->mTitle->getArticleID();
2329
2330                 if ( $id == 0 ) {
2331                         return array();
2332                 }
2333
2334                 $dbr = wfGetDB( DB_SLAVE );
2335                 $res = $dbr->select( array( 'templatelinks' ),
2336                         array( 'tl_namespace', 'tl_title' ),
2337                         array( 'tl_from' => $id ),
2338                         __METHOD__ );
2339
2340                 if ( $res !== false ) {
2341                         foreach ( $res as $row ) {
2342                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2343                         }
2344                 }
2345
2346                 return $result;
2347         }
2348
2349         /**
2350          * Return a list of distant templates used by this article.
2351          * Uses the globaltemplatelinks table
2352          *
2353          * @return Array of Title objects
2354          */
2355         public function getUsedDistantTemplates() {
2356                 global $wgGlobalDatabase;
2357
2358                 $result = array();
2359
2360                 if ( $wgGlobalDatabase ) {
2361                         $id = $this->mTitle->getArticleID();
2362
2363                         if ( $id == 0 ) {
2364                                 return array();
2365                         }
2366
2367                         $dbr = wfGetDB( DB_SLAVE, array(), $wgGlobalDatabase );
2368                         $res = $dbr->select( 'globaltemplatelinks',
2369                                 array( 'gtl_to_prefix', 'gtl_to_namespace', 'gtl_to_title' ),
2370                                 array( 'gtl_from_wiki' => wfWikiID( ), 'gtl_from_page' => $id ),
2371                                 __METHOD__ );
2372
2373                         if ( $res !== false ) {
2374                                 foreach ( $res as $row ) {
2375                                         $result[] = Title::makeTitle( $row->gtl_to_namespace, $row->gtl_to_title, null, $row->gtl_to_prefix );
2376                                 }
2377                         }
2378                 }
2379
2380                 return $result;
2381         }
2382
2383         /**
2384          * Returns a list of hidden categories this page is a member of.
2385          * Uses the page_props and categorylinks tables.
2386          *
2387          * @return Array of Title objects
2388          */
2389         public function getHiddenCategories() {
2390                 $result = array();
2391                 $id = $this->mTitle->getArticleID();
2392
2393                 if ( $id == 0 ) {
2394                         return array();
2395                 }
2396
2397                 $dbr = wfGetDB( DB_SLAVE );
2398                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2399                         array( 'cl_to' ),
2400                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2401                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2402                         __METHOD__ );
2403
2404                 if ( $res !== false ) {
2405                         foreach ( $res as $row ) {
2406                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2407                         }
2408                 }
2409
2410                 return $result;
2411         }
2412
2413         /**
2414         * Return an applicable autosummary if one exists for the given edit.
2415         * @param $oldtext String: the previous text of the page.
2416         * @param $newtext String: The submitted text of the page.
2417         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2418         * @return string An appropriate autosummary, or an empty string.
2419         */
2420         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2421                 global $wgContLang;
2422
2423                 # Decide what kind of autosummary is needed.
2424
2425                 # Redirect autosummaries
2426                 $ot = Title::newFromRedirect( $oldtext );
2427                 $rt = Title::newFromRedirect( $newtext );
2428
2429                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2430                         $truncatedtext = $wgContLang->truncate(
2431                                 str_replace( "\n", ' ', $newtext ),
2432                                 max( 0, 250
2433                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2434                                         - strlen( $rt->getFullText() )
2435                                 ) );
2436                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2437                 }
2438
2439                 # New page autosummaries
2440                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2441                         # If they're making a new article, give its text, truncated, in the summary.
2442
2443                         $truncatedtext = $wgContLang->truncate(
2444                                 str_replace( "\n", ' ', $newtext ),
2445                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2446
2447                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2448                 }
2449
2450                 # Blanking autosummaries
2451                 if ( $oldtext != '' && $newtext == '' ) {
2452                         return wfMsgForContent( 'autosumm-blank' );
2453                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2454                         # Removing more than 90% of the article
2455
2456                         $truncatedtext = $wgContLang->truncate(
2457                                 $newtext,
2458                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2459
2460                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2461                 }
2462
2463                 # If we reach this point, there's no applicable autosummary for our case, so our
2464                 # autosummary is empty.
2465                 return '';
2466         }
2467
2468         /**
2469          * Auto-generates a deletion reason
2470          *
2471          * @param &$hasHistory Boolean: whether the page has a history
2472          * @return mixed String containing deletion reason or empty string, or boolean false
2473          *    if no revision occurred
2474          */
2475         public function getAutoDeleteReason( &$hasHistory ) {
2476                 global $wgContLang;
2477
2478                 $dbw = wfGetDB( DB_MASTER );
2479                 // Get the last revision
2480                 $rev = Revision::newFromTitle( $this->getTitle() );
2481
2482                 if ( is_null( $rev ) ) {
2483                         return false;
2484                 }
2485
2486                 // Get the article's contents
2487                 $contents = $rev->getText();
2488                 $blank = false;
2489
2490                 // If the page is blank, use the text from the previous revision,
2491                 // which can only be blank if there's a move/import/protect dummy revision involved
2492                 if ( $contents == '' ) {
2493                         $prev = $rev->getPrevious();
2494
2495                         if ( $prev )    {
2496                                 $contents = $prev->getText();
2497                                 $blank = true;
2498                         }
2499                 }
2500
2501                 // Find out if there was only one contributor
2502                 // Only scan the last 20 revisions
2503                 $res = $dbw->select( 'revision', 'rev_user_text',
2504                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2505                         __METHOD__,
2506                         array( 'LIMIT' => 20 )
2507                 );
2508
2509                 if ( $res === false ) {
2510                         // This page has no revisions, which is very weird
2511                         return false;
2512                 }
2513
2514                 $hasHistory = ( $res->numRows() > 1 );
2515                 $row = $dbw->fetchObject( $res );
2516
2517                 if ( $row ) { // $row is false if the only contributor is hidden
2518                         $onlyAuthor = $row->rev_user_text;
2519                         // Try to find a second contributor
2520                         foreach ( $res as $row ) {
2521                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2522                                         $onlyAuthor = false;
2523                                         break;
2524                                 }
2525                         }
2526                 } else {
2527                         $onlyAuthor = false;
2528                 }
2529
2530                 // Generate the summary with a '$1' placeholder
2531                 if ( $blank ) {
2532                         // The current revision is blank and the one before is also
2533                         // blank. It's just not our lucky day
2534                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2535                 } else {
2536                         if ( $onlyAuthor ) {
2537                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2538                         } else {
2539                                 $reason = wfMsgForContent( 'excontent', '$1' );
2540                         }
2541                 }
2542
2543                 if ( $reason == '-' ) {
2544                         // Allow these UI messages to be blanked out cleanly
2545                         return '';
2546                 }
2547
2548                 // Replace newlines with spaces to prevent uglyness
2549                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2550                 // Calculate the maximum amount of chars to get
2551                 // Max content length = max comment length - length of the comment (excl. $1)
2552                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2553                 $contents = $wgContLang->truncate( $contents, $maxLength );
2554                 // Remove possible unfinished links
2555                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2556                 // Now replace the '$1' placeholder
2557                 $reason = str_replace( '$1', $contents, $reason );
2558
2559                 return $reason;
2560         }
2561
2562         /**
2563          * Get parser options suitable for rendering the primary article wikitext
2564          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
2565          * @return mixed ParserOptions object or boolean false
2566          */
2567         public function getParserOptions( $canonical = false ) {
2568                 global $wgUser, $wgLanguageCode;
2569
2570                 if ( !$this->mParserOptions || $canonical ) {
2571                         $user = !$canonical ? $wgUser : new User;
2572                         $parserOptions = new ParserOptions( $user );
2573                         $parserOptions->setTidy( true );
2574                         $parserOptions->enableLimitReport();
2575
2576                         if ( $canonical ) {
2577                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
2578                                 return $parserOptions;
2579                         }
2580                         $this->mParserOptions = $parserOptions;
2581                 }
2582                 // Clone to allow modifications of the return value without affecting cache
2583                 return clone $this->mParserOptions;
2584         }
2585
2586         /**
2587         * Get parser options suitable for rendering the primary article wikitext
2588         * @param User $user
2589         * @return ParserOptions
2590         */
2591         public function makeParserOptions( User $user ) {
2592                 $options = ParserOptions::newFromUser( $user );
2593                 $options->enableLimitReport(); // show inclusion/loop reports
2594                 $options->setTidy( true ); // fix bad HTML
2595                 return $options;
2596         }
2597
2598         /**
2599          * Update all the appropriate counts in the category table, given that
2600          * we've added the categories $added and deleted the categories $deleted.
2601          *
2602          * @param $added array   The names of categories that were added
2603          * @param $deleted array The names of categories that were deleted
2604          */
2605         public function updateCategoryCounts( $added, $deleted ) {
2606                 $ns = $this->mTitle->getNamespace();
2607                 $dbw = wfGetDB( DB_MASTER );
2608
2609                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2610                 # exist, we might legitimately not create it, but it's simpler to just
2611                 # create it and then give it a negative value, since the value is bogus
2612                 # anyway.
2613                 #
2614                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2615                 $insertCats = array_merge( $added, $deleted );
2616                 if ( !$insertCats ) {
2617                         # Okay, nothing to do
2618                         return;
2619                 }
2620
2621                 $insertRows = array();
2622
2623                 foreach ( $insertCats as $cat ) {
2624                         $insertRows[] = array(
2625                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2626                                 'cat_title' => $cat
2627                         );
2628                 }
2629                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2630
2631                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2632                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2633
2634                 if ( $ns == NS_CATEGORY ) {
2635                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2636                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2637                 } elseif ( $ns == NS_FILE ) {
2638                         $addFields[]    = 'cat_files = cat_files + 1';
2639                         $removeFields[] = 'cat_files = cat_files - 1';
2640                 }
2641
2642                 if ( $added ) {
2643                         $dbw->update(
2644                                 'category',
2645                                 $addFields,
2646                                 array( 'cat_title' => $added ),
2647                                 __METHOD__
2648                         );
2649                 }
2650
2651                 if ( $deleted ) {
2652                         $dbw->update(
2653                                 'category',
2654                                 $removeFields,
2655                                 array( 'cat_title' => $deleted ),
2656                                 __METHOD__
2657                         );
2658                 }
2659         }
2660
2661         /**
2662          * Updates cascading protections
2663          *
2664          * @param $parserOutput ParserOutput object for the current version
2665          **/
2666         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2667                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2668                         return;
2669                 }
2670
2671                 // templatelinks table may have become out of sync,
2672                 // especially if using variable-based transclusions.
2673                 // For paranoia, check if things have changed and if
2674                 // so apply updates to the database. This will ensure
2675                 // that cascaded protections apply as soon as the changes
2676                 // are visible.
2677
2678                 # Get templates from templatelinks
2679                 $id = $this->mTitle->getArticleID();
2680
2681                 $tlTemplates = array();
2682
2683                 $dbr = wfGetDB( DB_SLAVE );
2684                 $res = $dbr->select( array( 'templatelinks' ),
2685                         array( 'tl_namespace', 'tl_title' ),
2686                         array( 'tl_from' => $id ),
2687                         __METHOD__
2688                 );
2689
2690                 foreach ( $res as $row ) {
2691                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2692                 }
2693
2694                 # Get templates from parser output.
2695                 $poTemplates = array();
2696                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2697                         foreach ( $templates as $dbk => $id ) {
2698                                 $poTemplates["$ns:$dbk"] = true;
2699                         }
2700                 }
2701
2702                 # Get the diff
2703                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2704
2705                 if ( count( $templates_diff ) > 0 ) {
2706                         # Whee, link updates time.
2707                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2708                         $u->doUpdate();
2709                 }
2710         }
2711
2712         /*
2713         * @deprecated since 1.18
2714         */
2715         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2716                 global $wgUser;
2717                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2718         }
2719
2720         /*
2721         * @deprecated since 1.18
2722         */
2723         public function viewUpdates() {
2724                 global $wgUser;
2725                 return $this->doViewUpdates( $wgUser );
2726         }
2727
2728         /*
2729         * @deprecated since 1.18
2730         */
2731         public function useParserCache( $oldid ) {
2732                 global $wgUser;
2733                 return $this->isParserCacheUsed( $wgUser, $oldid );
2734         }
2735 }