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