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          */
  19         public $mTitle = null;
  20
  21         /**@{{
  22          * @protected
  23          */
  24         public $mDataLoaded = false;         // !< Boolean
  25         public $mIsRedirect = false;         // !< Boolean
  26         public $mLatest = false;             // !< Integer (false means "not loaded")
  27         public $mPreparedEdit = false;           // !< Array
  28
  29         /**
  30          * @var Title
  31          */
  32         protected $mRedirectTarget = null;
  33
  34         /**
  35          * @var Revision
  36          */
  37         protected $mLastRevision = null;
  38
  39         protected $mTimestamp = '';             // !< String
  40         protected $mTouched = '19700101000000'; // !< String
  41         /**@}}*/
  42
  43         /**
  44          * Constructor and clear the article
  45          * @param $title Title Reference to a Title object.
  46          */
  47         public function __construct( Title $title ) {
  48                 $this->mTitle = $title;
  49         }
  50
  51         /**
  52          * Create a WikiPage object of the appropriate class for the given title.
  53          *
  54          * @param $title Title
  55          * @return WikiPage object of the appropriate type
  56          */
  57         public static function factory( Title $title ) {
  58                 $ns = $title->getNamespace();
  59
  60                 if ( $ns == NS_MEDIA ) {
  61                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  62                 } elseif ( $ns < 0 ) {
  63                         throw new MWException( "Invalid or virtual namespace $ns given." );
  64                 }
  65
  66                 switch ( $ns ) {
  67                         case NS_FILE:
  68                                 $page = new WikiFilePage( $title );
  69                                 break;
  70                         case NS_CATEGORY:
  71                                 $page = new WikiCategoryPage( $title );
  72                                 break;
  73                         default:
  74                                 $page = new WikiPage( $title );
  75                 }
  76
  77                 return $page;
  78         }
  79
  80         /**
  81          * Constructor from a page id
  82          *
  83          * @param $id Int article ID to load
  84          *
  85          * @return WikiPage
  86          */
  87         public static function newFromID( $id ) {
  88                 $t = Title::newFromID( $id );
  89                 if ( $t ) {
  90                         return self::factory( $t );
  91                 }
  92                 return null;
  93         }
  94
  95         /**
  96          * Returns overrides for action handlers.
  97          * Classes listed here will be used instead of the default one when
  98          * (and only when) $wgActions[$action] === true. This allows subclasses
  99          * to override the default behavior.
 100          *
 101          * @todo: move this UI stuff somewhere else
 102          *
 103          * @return Array
 104          */
 105         public function getActionOverrides() {
 106                 return array();
 107         }
 108
 109         /**
 110          * If this page is a redirect, get its target
 111          *
 112          * The target will be fetched from the redirect table if possible.
 113          * If this page doesn't have an entry there, call insertRedirect()
 114          * @return Title|mixed object, or null if this page is not a redirect
 115          */
 116         public function getRedirectTarget() {
 117                 if ( !$this->mTitle->isRedirect() ) {
 118                         return null;
 119                 }
 120
 121                 if ( $this->mRedirectTarget !== null ) {
 122                         return $this->mRedirectTarget;
 123                 }
 124
 125                 # Query the redirect table
 126                 $dbr = wfGetDB( DB_SLAVE );
 127                 $row = $dbr->selectRow( 'redirect',
 128                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 129                         array( 'rd_from' => $this->getId() ),
 130                         __METHOD__
 131                 );
 132
 133                 // rd_fragment and rd_interwiki were added later, populate them if empty
 134                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 135                         return $this->mRedirectTarget = Title::makeTitle(
 136                                 $row->rd_namespace, $row->rd_title,
 137                                 $row->rd_fragment, $row->rd_interwiki );
 138                 }
 139
 140                 # This page doesn't have an entry in the redirect table
 141                 return $this->mRedirectTarget = $this->insertRedirect();
 142         }
 143
 144         /**
 145          * Insert an entry for this page into the redirect table.
 146          *
 147          * Don't call this function directly unless you know what you're doing.
 148          * @return Title object or null if not a redirect
 149          */
 150         public function insertRedirect() {
 151                 // recurse through to only get the final target
 152                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 153                 if ( !$retval ) {
 154                         return null;
 155                 }
 156                 $this->insertRedirectEntry( $retval );
 157                 return $retval;
 158         }
 159
 160         /**
 161          * Insert or update the redirect table entry for this page to indicate
 162          * it redirects to $rt .
 163          * @param $rt Title redirect target
 164          */
 165         public function insertRedirectEntry( $rt ) {
 166                 $dbw = wfGetDB( DB_MASTER );
 167                 $dbw->replace( 'redirect', array( 'rd_from' ),
 168                         array(
 169                                 'rd_from'      => $this->getId(),
 170                                 'rd_namespace' => $rt->getNamespace(),
 171                                 'rd_title'     => $rt->getDBkey(),
 172                                 'rd_fragment'  => $rt->getFragment(),
 173                                 'rd_interwiki' => $rt->getInterwiki(),
 174                         ),
 175                         __METHOD__
 176                 );
 177         }
 178
 179         /**
 180          * Get the Title object or URL this page redirects to
 181          *
 182          * @return mixed false, Title of in-wiki target, or string with URL
 183          */
 184         public function followRedirect() {
 185                 return $this->getRedirectURL( $this->getRedirectTarget() );
 186         }
 187
 188         /**
 189          * Get the Title object or URL to use for a redirect. We use Title
 190          * objects for same-wiki, non-special redirects and URLs for everything
 191          * else.
 192          * @param $rt Title Redirect target
 193          * @return mixed false, Title object of local target, or string with URL
 194          */
 195         public function getRedirectURL( $rt ) {
 196                 if ( $rt ) {
 197                         if ( $rt->getInterwiki() != '' ) {
 198                                 if ( $rt->isLocal() ) {
 199                                         // Offsite wikis need an HTTP redirect.
 200                                         //
 201                                         // This can be hard to reverse and may produce loops,
 202                                         // so they may be disabled in the site configuration.
 203                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 204                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 205                                 }
 206                         } else {
 207                                 if ( $rt->isSpecialPage() ) {
 208                                         // Gotta handle redirects to special pages differently:
 209                                         // Fill the HTTP response "Location" header and ignore
 210                                         // the rest of the page we're on.
 211                                         //
 212                                         // This can be hard to reverse, so they may be disabled.
 213                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 214                                                 // rolleyes
 215                                         } else {
 216                                                 return $rt->getFullURL();
 217                                         }
 218                                 }
 219
 220                                 return $rt;
 221                         }
 222                 }
 223
 224                 // No or invalid redirect
 225                 return false;
 226         }
 227
 228         /**
 229          * Get the title object of the article
 230          * @return Title object of this page
 231          */
 232         public function getTitle() {
 233                 return $this->mTitle;
 234         }
 235
 236         /**
 237          * Clear the object
 238          */
 239         public function clear() {
 240                 $this->mDataLoaded = false;
 241
 242                 $this->mRedirectTarget = null; # Title object if set
 243                 $this->mLastRevision = null; # Latest revision
 244                 $this->mTimestamp = '';
 245                 $this->mTouched = '19700101000000';
 246                 $this->mIsRedirect = false;
 247                 $this->mLatest = false;
 248                 $this->mPreparedEdit = false;
 249         }
 250
 251         /**
 252          * Get the text that needs to be saved in order to undo all revisions
 253          * between $undo and $undoafter. Revisions must belong to the same page,
 254          * must exist and must not be deleted
 255          * @param $undo Revision
 256          * @param $undoafter Revision Must be an earlier revision than $undo
 257          * @return mixed string on success, false on failure
 258          */
 259         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 260                 $cur_text = $this->getRawText();
 261                 if ( $cur_text === false ) {
 262                         return false; // no page
 263                 }
 264                 $undo_text = $undo->getText();
 265                 $undoafter_text = $undoafter->getText();
 266
 267                 if ( $cur_text == $undo_text ) {
 268                         # No use doing a merge if it's just a straight revert.
 269                         return $undoafter_text;
 270                 }
 271
 272                 $undone_text = '';
 273
 274                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 275                         return false;
 276                 }
 277
 278                 return $undone_text;
 279         }
 280
 281         /**
 282          * Return the list of revision fields that should be selected to create
 283          * a new page.
 284          *
 285          * @return array
 286          */
 287         public static function selectFields() {
 288                 return array(
 289                         'page_id',
 290                         'page_namespace',
 291                         'page_title',
 292                         'page_restrictions',
 293                         'page_counter',
 294                         'page_is_redirect',
 295                         'page_is_new',
 296                         'page_random',
 297                         'page_touched',
 298                         'page_latest',
 299                         'page_len',
 300                 );
 301         }
 302
 303         /**
 304          * Fetch a page record with the given conditions
 305          * @param $dbr DatabaseBase object
 306          * @param $conditions Array
 307          * @return mixed Database result resource, or false on failure
 308          */
 309         protected function pageData( $dbr, $conditions ) {
 310                 $fields = self::selectFields();
 311
 312                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 313
 314                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 315
 316                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 317
 318                 return $row;
 319         }
 320
 321         /**
 322          * Fetch a page record matching the Title object's namespace and title
 323          * using a sanitized title string
 324          *
 325          * @param $dbr DatabaseBase object
 326          * @param $title Title object
 327          * @return mixed Database result resource, or false on failure
 328          */
 329         public function pageDataFromTitle( $dbr, $title ) {
 330                 return $this->pageData( $dbr, array(
 331                         'page_namespace' => $title->getNamespace(),
 332                         'page_title'     => $title->getDBkey() ) );
 333         }
 334
 335         /**
 336          * Fetch a page record matching the requested ID
 337          *
 338          * @param $dbr DatabaseBase
 339          * @param $id Integer
 340          * @return mixed Database result resource, or false on failure
 341          */
 342         public function pageDataFromId( $dbr, $id ) {
 343                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 344         }
 345
 346         /**
 347          * Set the general counter, title etc data loaded from
 348          * some source.
 349          *
 350          * @param $data Object|String One of the following:
 351          *              A DB query result object or...
 352          *              "fromdb" to get from a slave DB or...
 353          *              "fromdbmaster" to get from the master DB
 354          * @return void
 355          */
 356         public function loadPageData( $data = 'fromdb' ) {
 357                 if ( $data === 'fromdbmaster' ) {
 358                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 359                 } elseif ( $data === 'fromdb' ) { // slave
 360                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 361                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 362                         # Note that DB also stores the master position in the session and checks it.
 363                         $touched = $this->getCachedLastEditTime();
 364                         if ( $touched ) { // key set
 365                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 366                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 367                                 }
 368                         }
 369                 }
 370
 371                 $lc = LinkCache::singleton();
 372
 373                 if ( $data ) {
 374                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 375
 376                         $this->mTitle->loadFromRow( $data );
 377
 378                         # Old-fashioned restrictions
 379                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 380
 381                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 382                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 383                         $this->mLatest      = intval( $data->page_latest );
 384                 } else {
 385                         $lc->addBadLinkObj( $this->mTitle );
 386
 387                         $this->mTitle->loadFromRow( false );
 388                 }
 389
 390                 $this->mDataLoaded = true;
 391         }
 392
 393         /**
 394          * @return int Page ID
 395          */
 396         public function getId() {
 397                 return $this->mTitle->getArticleID();
 398         }
 399
 400         /**
 401          * @return bool Whether or not the page exists in the database
 402          */
 403         public function exists() {
 404                 return $this->mTitle->exists();
 405         }
 406
 407         /**
 408          * Check if this page is something we're going to be showing
 409          * some sort of sensible content for. If we return false, page
 410          * views (plain action=view) will return an HTTP 404 response,
 411          * so spiders and robots can know they're following a bad link.
 412          *
 413          * @return bool
 414          */
 415         public function hasViewableContent() {
 416                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 417         }
 418
 419         /**
 420          * Get the number of views of this page
 421          *
 422          * @return int The view count for the page
 423          */
 424         public function getCount() {
 425                 return $this->mTitle->getCount();
 426         }
 427
 428         /**
 429          * Determine whether a page would be suitable for being counted as an
 430          * article in the site_stats table based on the title & its content
 431          *
 432          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 433          *        if false, the current database state will be used
 434          * @return Boolean
 435          */
 436         public function isCountable( $editInfo = false ) {
 437                 global $wgArticleCountMethod;
 438
 439                 if ( !$this->mTitle->isContentPage() ) {
 440                         return false;
 441                 }
 442
 443                 $text = $editInfo ? $editInfo->pst : false;
 444
 445                 if ( $this->isRedirect( $text ) ) {
 446                         return false;
 447                 }
 448
 449                 switch ( $wgArticleCountMethod ) {
 450                 case 'any':
 451                         return true;
 452                 case 'comma':
 453                         if ( $text === false ) {
 454                                 $text = $this->getRawText();
 455                         }
 456                         return strpos( $text,  ',' ) !== false;
 457                 case 'link':
 458                         if ( $editInfo ) {
 459                                 // ParserOutput::getLinks() is a 2D array of page links, so
 460                                 // to be really correct we would need to recurse in the array
 461                                 // but the main array should only have items in it if there are
 462                                 // links.
 463                                 return (bool)count( $editInfo->output->getLinks() );
 464                         } else {
 465                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 466                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 467                         }
 468                 }
 469         }
 470
 471         /**
 472          * Tests if the article text represents a redirect
 473          *
 474          * @param $text mixed string containing article contents, or boolean
 475          * @return bool
 476          */
 477         public function isRedirect( $text = false ) {
 478                 if ( $text === false ) {
 479                         if ( !$this->mDataLoaded ) {
 480                                 $this->loadPageData();
 481                         }
 482
 483                         return (bool)$this->mIsRedirect;
 484                 } else {
 485                         return Title::newFromRedirect( $text ) !== null;
 486                 }
 487         }
 488
 489         /**
 490          * Loads everything except the text
 491          * This isn't necessary for all uses, so it's only done if needed.
 492          */
 493         protected function loadLastEdit() {
 494                 if ( $this->mLastRevision !== null ) {
 495                         return; // already loaded
 496                 }
 497
 498                 $latest = $this->getLatest();
 499                 if ( !$latest ) {
 500                         return; // page doesn't exist or is missing page_latest info
 501                 }
 502
 503                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 504                 if ( $revision ) { // sanity
 505                         $this->setLastEdit( $revision );
 506                 }
 507         }
 508
 509         /**
 510          * Set the latest revision
 511          */
 512         protected function setLastEdit( Revision $revision ) {
 513                 $this->mLastRevision = $revision;
 514                 $this->mTimestamp = $revision->getTimestamp();
 515         }
 516
 517         /**
 518          * Get the latest revision
 519          * @return Revision|null
 520          */
 521         public function getRevision() {
 522                 $this->loadLastEdit();
 523                 if ( $this->mLastRevision ) {
 524                         return $this->mLastRevision;
 525                 }
 526                 return null;
 527         }
 528
 529         /**
 530          * Get the text of the current revision. No side-effects...
 531          *
 532          * @param $audience Integer: one of:
 533          *      Revision::FOR_PUBLIC       to be displayed to all users
 534          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 535          *      Revision::RAW              get the text regardless of permissions
 536          * @return String|false The text of the current revision
 537          */
 538         public function getText( $audience = Revision::FOR_PUBLIC ) {
 539                 $this->loadLastEdit();
 540                 if ( $this->mLastRevision ) {
 541                         return $this->mLastRevision->getText( $audience );
 542                 }
 543                 return false;
 544         }
 545
 546         /**
 547          * Get the text of the current revision. No side-effects...
 548          *
 549          * @return String|false The text of the current revision
 550          */
 551         public function getRawText() {
 552                 $this->loadLastEdit();
 553                 if ( $this->mLastRevision ) {
 554                         return $this->mLastRevision->getRawText();
 555                 }
 556                 return false;
 557         }
 558
 559         /**
 560          * @return string MW timestamp of last article revision
 561          */
 562         public function getTimestamp() {
 563                 // Check if the field has been filled by WikiPage::setTimestamp()
 564                 if ( !$this->mTimestamp ) {
 565                         $this->loadLastEdit();
 566                 }
 567                 return wfTimestamp( TS_MW, $this->mTimestamp );
 568         }
 569
 570         /**
 571          * Set the page timestamp (use only to avoid DB queries)
 572          * @param $ts string MW timestamp of last article revision
 573          * @return void
 574          */
 575         public function setTimestamp( $ts ) {
 576                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 577         }
 578
 579         /**
 580          * @param $audience Integer: one of:
 581          *      Revision::FOR_PUBLIC       to be displayed to all users
 582          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 583          *      Revision::RAW              get the text regardless of permissions
 584          * @return int user ID for the user that made the last article revision
 585          */
 586         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 587                 $this->loadLastEdit();
 588                 if ( $this->mLastRevision ) {
 589                         return $this->mLastRevision->getUser( $audience );
 590                 } else {
 591                         return -1;
 592                 }
 593         }
 594
 595         /**
 596          * @param $audience Integer: one of:
 597          *      Revision::FOR_PUBLIC       to be displayed to all users
 598          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 599          *      Revision::RAW              get the text regardless of permissions
 600          * @return string username of the user that made the last article revision
 601          */
 602         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 603                 $this->loadLastEdit();
 604                 if ( $this->mLastRevision ) {
 605                         return $this->mLastRevision->getUserText( $audience );
 606                 } else {
 607                         return '';
 608                 }
 609         }
 610
 611         /**
 612          * @param $audience Integer: one of:
 613          *      Revision::FOR_PUBLIC       to be displayed to all users
 614          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 615          *      Revision::RAW              get the text regardless of permissions
 616          * @return string Comment stored for the last article revision
 617          */
 618         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 619                 $this->loadLastEdit();
 620                 if ( $this->mLastRevision ) {
 621                         return $this->mLastRevision->getComment( $audience );
 622                 } else {
 623                         return '';
 624                 }
 625         }
 626
 627         /**
 628          * Returns true if last revision was marked as "minor edit"
 629          *
 630          * @return boolean Minor edit indicator for the last article revision.
 631          */
 632         public function getMinorEdit() {
 633                 $this->loadLastEdit();
 634                 if ( $this->mLastRevision ) {
 635                         return $this->mLastRevision->isMinor();
 636                 } else {
 637                         return false;
 638                 }
 639         }
 640
 641         /**
 642          * Get a list of users who have edited this article, not including the user who made
 643          * the most recent revision, which you can get from $article->getUser() if you want it
 644          * @return UserArrayFromResult
 645          */
 646         public function getContributors() {
 647                 # @todo FIXME: This is expensive; cache this info somewhere.
 648
 649                 $dbr = wfGetDB( DB_SLAVE );
 650
 651                 if ( $dbr->implicitGroupby() ) {
 652                         $realNameField = 'user_real_name';
 653                 } else {
 654                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 655                 }
 656
 657                 $tables = array( 'revision', 'user' );
 658
 659                 $fields = array(
 660                         'rev_user as user_id',
 661                         'rev_user_text AS user_name',
 662                         $realNameField,
 663                         'MAX(rev_timestamp) AS timestamp',
 664                 );
 665
 666                 $conds = array( 'rev_page' => $this->getId() );
 667
 668                 // The user who made the top revision gets credited as "this page was last edited by
 669                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 670                 $user = $this->getUser();
 671                 if ( $user ) {
 672                         $conds[] = "rev_user != $user";
 673                 } else {
 674                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 675                 }
 676
 677                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 678
 679                 $jconds = array(
 680                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 681                 );
 682
 683                 $options = array(
 684                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 685                         'ORDER BY' => 'timestamp DESC',
 686                 );
 687
 688                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 689                 return new UserArrayFromResult( $res );
 690         }
 691
 692         /**
 693          * Should the parser cache be used?
 694          *
 695          * @param $parserOptions ParserOptions to check
 696          * @param $oldid int
 697          * @return boolean
 698          */
 699         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 700                 global $wgEnableParserCache;
 701
 702                 return $wgEnableParserCache
 703                         && $parserOptions->getStubThreshold() == 0
 704                         && $this->mTitle->exists()
 705                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 706                         && $this->mTitle->isWikitextPage();
 707         }
 708
 709         /**
 710          * Get a ParserOutput for the given ParserOptions and revision ID.
 711          * The parser cache will be used if possible.
 712          *
 713          * @since 1.19
 714          * @param $parserOptions ParserOptions to use for the parse operation
 715          * @param $oldid Revision ID to get the text from, passing null or 0 will
 716          *               get the current revision (default value)
 717          * @return ParserOutput or false if the revision was not found
 718          */
 719         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 720                 wfProfileIn( __METHOD__ );
 721
 722                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 723                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 724                 if ( $parserOptions->getStubThreshold() ) {
 725                         wfIncrStats( 'pcache_miss_stub' );
 726                 }
 727
 728                 if ( $useParserCache ) {
 729                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 730                         if ( $parserOutput !== false ) {
 731                                 wfProfileOut( __METHOD__ );
 732                                 return $parserOutput;
 733                         }
 734                 }
 735
 736                 if ( $oldid === null || $oldid === 0 ) {
 737                         $oldid = $this->getLatest();
 738                 }
 739
 740                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 741                 $pool->execute();
 742
 743                 wfProfileOut( __METHOD__ );
 744
 745                 return $pool->getParserOutput();
 746         }
 747
 748         /**
 749          * Perform the actions of a page purging
 750          */
 751         public function doPurge() {
 752                 global $wgUseSquid;
 753
 754                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 755                         return false;
 756                 }
 757
 758                 // Invalidate the cache
 759                 $this->mTitle->invalidateCache();
 760                 $this->clear();
 761
 762                 if ( $wgUseSquid ) {
 763                         // Commit the transaction before the purge is sent
 764                         $dbw = wfGetDB( DB_MASTER );
 765                         $dbw->commit();
 766
 767                         // Send purge
 768                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 769                         $update->doUpdate();
 770                 }
 771
 772                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 773                         if ( $this->mTitle->exists() ) {
 774                                 $text = $this->getRawText();
 775                         } else {
 776                                 $text = false;
 777                         }
 778
 779                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 780                 }
 781                 return true;
 782         }
 783
 784         /**
 785          * Insert a new empty page record for this article.
 786          * This *must* be followed up by creating a revision
 787          * and running $this->updateRevisionOn( ... );
 788          * or else the record will be left in a funky state.
 789          * Best if all done inside a transaction.
 790          *
 791          * @param $dbw DatabaseBase
 792          * @return int The newly created page_id key, or false if the title already existed
 793          */
 794         public function insertOn( $dbw ) {
 795                 wfProfileIn( __METHOD__ );
 796
 797                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 798                 $dbw->insert( 'page', array(
 799                         'page_id'           => $page_id,
 800                         'page_namespace'    => $this->mTitle->getNamespace(),
 801                         'page_title'        => $this->mTitle->getDBkey(),
 802                         'page_counter'      => 0,
 803                         'page_restrictions' => '',
 804                         'page_is_redirect'  => 0, # Will set this shortly...
 805                         'page_is_new'       => 1,
 806                         'page_random'       => wfRandom(),
 807                         'page_touched'      => $dbw->timestamp(),
 808                         'page_latest'       => 0, # Fill this in shortly...
 809                         'page_len'          => 0, # Fill this in shortly...
 810                 ), __METHOD__, 'IGNORE' );
 811
 812                 $affected = $dbw->affectedRows();
 813
 814                 if ( $affected ) {
 815                         $newid = $dbw->insertId();
 816                         $this->mTitle->resetArticleID( $newid );
 817                 }
 818                 wfProfileOut( __METHOD__ );
 819
 820                 return $affected ? $newid : false;
 821         }
 822
 823         /**
 824          * Update the page record to point to a newly saved revision.
 825          *
 826          * @param $dbw DatabaseBase: object
 827          * @param $revision Revision: For ID number, and text used to set
 828          *                  length and redirect status fields
 829          * @param $lastRevision Integer: if given, will not overwrite the page field
 830          *                      when different from the currently set value.
 831          *                      Giving 0 indicates the new page flag should be set
 832          *                      on.
 833          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 834          *                           removing rows in redirect table.
 835          * @return bool true on success, false on failure
 836          * @private
 837          */
 838         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 839                 wfProfileIn( __METHOD__ );
 840
 841                 $text = $revision->getText();
 842                 $len = strlen( $text );
 843                 $rt = Title::newFromRedirectRecurse( $text );
 844
 845                 $conditions = array( 'page_id' => $this->getId() );
 846
 847                 if ( !is_null( $lastRevision ) ) {
 848                         # An extra check against threads stepping on each other
 849                         $conditions['page_latest'] = $lastRevision;
 850                 }
 851
 852                 $now = wfTimestampNow();
 853                 $dbw->update( 'page',
 854                         array( /* SET */
 855                                 'page_latest'      => $revision->getId(),
 856                                 'page_touched'     => $dbw->timestamp( $now ),
 857                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 858                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 859                                 'page_len'         => $len,
 860                         ),
 861                         $conditions,
 862                         __METHOD__ );
 863
 864                 $result = $dbw->affectedRows() != 0;
 865                 if ( $result ) {
 866                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 867                         $this->setLastEdit( $revision );
 868                         $this->setCachedLastEditTime( $now );
 869                         $this->mLatest = $revision->getId();
 870                         $this->mIsRedirect = (bool)$rt;
 871                         # Update the LinkCache.
 872                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
 873                 }
 874
 875                 wfProfileOut( __METHOD__ );
 876                 return $result;
 877         }
 878
 879         /**
 880          * Get the cached timestamp for the last time the page changed.
 881          * This is only used to help handle slave lag by comparing to page_touched.
 882          * @return string MW timestamp
 883          */
 884         protected function getCachedLastEditTime() {
 885                 global $wgMemc;
 886                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 887                 return $wgMemc->get( $key );
 888         }
 889
 890         /**
 891          * Set the cached timestamp for the last time the page changed.
 892          * This is only used to help handle slave lag by comparing to page_touched.
 893          * @param $timestamp string
 894          * @return void
 895          */
 896         public function setCachedLastEditTime( $timestamp ) {
 897                 global $wgMemc;
 898                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 899                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 900         }
 901
 902         /**
 903          * Add row to the redirect table if this is a redirect, remove otherwise.
 904          *
 905          * @param $dbw DatabaseBase
 906          * @param $redirectTitle Title object pointing to the redirect target,
 907          *                       or NULL if this is not a redirect
 908          * @param $lastRevIsRedirect If given, will optimize adding and
 909          *                           removing rows in redirect table.
 910          * @return bool true on success, false on failure
 911          * @private
 912          */
 913         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 914                 // Always update redirects (target link might have changed)
 915                 // Update/Insert if we don't know if the last revision was a redirect or not
 916                 // Delete if changing from redirect to non-redirect
 917                 $isRedirect = !is_null( $redirectTitle );
 918
 919                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 920                         return true;
 921                 }
 922
 923                 wfProfileIn( __METHOD__ );
 924                 if ( $isRedirect ) {
 925                         $this->insertRedirectEntry( $redirectTitle );
 926                 } else {
 927                         // This is not a redirect, remove row from redirect table
 928                         $where = array( 'rd_from' => $this->getId() );
 929                         $dbw->delete( 'redirect', $where, __METHOD__ );
 930                 }
 931
 932                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 933                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 934                 }
 935                 wfProfileOut( __METHOD__ );
 936
 937                 return ( $dbw->affectedRows() != 0 );
 938         }
 939
 940         /**
 941          * If the given revision is newer than the currently set page_latest,
 942          * update the page record. Otherwise, do nothing.
 943          *
 944          * @param $dbw Database object
 945          * @param $revision Revision object
 946          * @return mixed
 947          */
 948         public function updateIfNewerOn( $dbw, $revision ) {
 949                 wfProfileIn( __METHOD__ );
 950
 951                 $row = $dbw->selectRow(
 952                         array( 'revision', 'page' ),
 953                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 954                         array(
 955                                 'page_id' => $this->getId(),
 956                                 'page_latest=rev_id' ),
 957                         __METHOD__ );
 958
 959                 if ( $row ) {
 960                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 961                                 wfProfileOut( __METHOD__ );
 962                                 return false;
 963                         }
 964                         $prev = $row->rev_id;
 965                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 966                 } else {
 967                         # No or missing previous revision; mark the page as new
 968                         $prev = 0;
 969                         $lastRevIsRedirect = null;
 970                 }
 971
 972                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 973
 974                 wfProfileOut( __METHOD__ );
 975                 return $ret;
 976         }
 977
 978         /**
 979          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 980          * @param $text String: new text of the section
 981          * @param $summary String: new section's subject, only if $section is 'new'
 982          * @param $edittime String: revision timestamp or null to use the current revision
 983          * @return string Complete article text, or null if error
 984          */
 985         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 986                 wfProfileIn( __METHOD__ );
 987
 988                 if ( strval( $section ) == '' ) {
 989                         // Whole-page edit; let the whole text through
 990                 } else {
 991                         if ( is_null( $edittime ) ) {
 992                                 $rev = Revision::newFromTitle( $this->mTitle );
 993                         } else {
 994                                 $dbw = wfGetDB( DB_MASTER );
 995                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 996                         }
 997
 998                         if ( !$rev ) {
 999                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1000                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1001                                 wfProfileOut( __METHOD__ );
1002                                 return null;
1003                         }
1004
1005                         $oldtext = $rev->getText();
1006
1007                         if ( $section == 'new' ) {
1008                                 # Inserting a new section
1009                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1010                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
1011                                         $text = strlen( trim( $oldtext ) ) > 0
1012                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1013                                                 : "{$subject}{$text}";
1014                                 }
1015                         } else {
1016                                 # Replacing an existing section; roll out the big guns
1017                                 global $wgParser;
1018
1019                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1020                         }
1021                 }
1022
1023                 wfProfileOut( __METHOD__ );
1024                 return $text;
1025         }
1026
1027         /**
1028          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1029          * @param $flags Int
1030          * @return Int updated $flags
1031          */
1032         function checkFlags( $flags ) {
1033                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1034                         if ( $this->mTitle->getArticleID() ) {
1035                                 $flags |= EDIT_UPDATE;
1036                         } else {
1037                                 $flags |= EDIT_NEW;
1038                         }
1039                 }
1040
1041                 return $flags;
1042         }
1043
1044         /**
1045          * Change an existing article or create a new article. Updates RC and all necessary caches,
1046          * optionally via the deferred update array.
1047          *
1048          * @param $text String: new text
1049          * @param $summary String: edit summary
1050          * @param $flags Integer bitfield:
1051          *      EDIT_NEW
1052          *          Article is known or assumed to be non-existent, create a new one
1053          *      EDIT_UPDATE
1054          *          Article is known or assumed to be pre-existing, update it
1055          *      EDIT_MINOR
1056          *          Mark this edit minor, if the user is allowed to do so
1057          *      EDIT_SUPPRESS_RC
1058          *          Do not log the change in recentchanges
1059          *      EDIT_FORCE_BOT
1060          *          Mark the edit a "bot" edit regardless of user rights
1061          *      EDIT_DEFER_UPDATES
1062          *          Defer some of the updates until the end of index.php
1063          *      EDIT_AUTOSUMMARY
1064          *          Fill in blank summaries with generated text where possible
1065          *
1066          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1067          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1068          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1069          * edit-already-exists error will be returned. These two conditions are also possible with
1070          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1071          *
1072          * @param $baseRevId the revision ID this edit was based off, if any
1073          * @param $user User the user doing the edit
1074          *
1075          * @return Status object. Possible errors:
1076          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1077          *     edit-gone-missing:       In update mode, but the article didn't exist
1078          *     edit-conflict:           In update mode, the article changed unexpectedly
1079          *     edit-no-change:          Warning that the text was the same as before
1080          *     edit-already-exists:     In creation mode, but the article already exists
1081          *
1082          *  Extensions may define additional errors.
1083          *
1084          *  $return->value will contain an associative array with members as follows:
1085          *     new:                     Boolean indicating if the function attempted to create a new article
1086          *     revision:                The revision object for the inserted revision, or null
1087          *
1088          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1089          */
1090         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1091                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1092
1093                 # Low-level sanity check
1094                 if ( $this->mTitle->getText() === '' ) {
1095                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1096                 }
1097
1098                 wfProfileIn( __METHOD__ );
1099
1100                 $user = is_null( $user ) ? $wgUser : $user;
1101                 $status = Status::newGood( array() );
1102
1103                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1104                 $this->loadPageData( 'fromdbmaster' );
1105
1106                 $flags = $this->checkFlags( $flags );
1107
1108                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1109                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1110                 {
1111                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1112
1113                         if ( $status->isOK() ) {
1114                                 $status->fatal( 'edit-hook-aborted' );
1115                         }
1116
1117                         wfProfileOut( __METHOD__ );
1118                         return $status;
1119                 }
1120
1121                 # Silently ignore EDIT_MINOR if not allowed
1122                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1123                 $bot = $flags & EDIT_FORCE_BOT;
1124
1125                 $oldtext = $this->getRawText(); // current revision
1126                 $oldsize = strlen( $oldtext );
1127                 $oldid = $this->getLatest();
1128                 $oldIsRedirect = $this->isRedirect();
1129                 $oldcountable = $this->isCountable();
1130
1131                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1132                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1133                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1134                 }
1135
1136                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1137                 $text = $editInfo->pst;
1138                 $newsize = strlen( $text );
1139
1140                 $dbw = wfGetDB( DB_MASTER );
1141                 $now = wfTimestampNow();
1142                 $this->mTimestamp = $now;
1143
1144                 if ( $flags & EDIT_UPDATE ) {
1145                         # Update article, but only if changed.
1146                         $status->value['new'] = false;
1147
1148                         # Make sure the revision is either completely inserted or not inserted at all
1149                         if ( !$wgDBtransactions ) {
1150                                 $userAbort = ignore_user_abort( true );
1151                         }
1152
1153                         $revision = new Revision( array(
1154                                 'page'       => $this->getId(),
1155                                 'comment'    => $summary,
1156                                 'minor_edit' => $isminor,
1157                                 'text'       => $text,
1158                                 'parent_id'  => $oldid,
1159                                 'user'       => $user->getId(),
1160                                 'user_text'  => $user->getName(),
1161                                 'timestamp'  => $now
1162                         ) );
1163
1164                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1165
1166                         if ( $changed ) {
1167                                 if ( !$this->mLatest ) {
1168                                         # Article gone missing
1169                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1170                                         $status->fatal( 'edit-gone-missing' );
1171
1172                                         wfProfileOut( __METHOD__ );
1173                                         return $status;
1174                                 }
1175
1176                                 $dbw->begin();
1177                                 $revisionId = $revision->insertOn( $dbw );
1178
1179                                 # Update page
1180                                 #
1181                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1182                                 # during the course of this function. This makes sure that EditPage can detect
1183                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1184                                 # before this function is called. A previous function used a separate query, this
1185                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1186                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1187
1188                                 if ( !$ok ) {
1189                                         /* Belated edit conflict! Run away!! */
1190                                         $status->fatal( 'edit-conflict' );
1191
1192                                         # Delete the invalid revision if the DB is not transactional
1193                                         if ( !$wgDBtransactions ) {
1194                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1195                                         }
1196
1197                                         $revisionId = 0;
1198                                         $dbw->rollback();
1199                                 } else {
1200                                         global $wgUseRCPatrol;
1201                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1202                                         # Update recentchanges
1203                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1204                                                 # Mark as patrolled if the user can do so
1205                                                 $patrolled = $wgUseRCPatrol && !count(
1206                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1207                                                 # Add RC row to the DB
1208                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1209                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1210                                                         $revisionId, $patrolled
1211                                                 );
1212
1213                                                 # Log auto-patrolled edits
1214                                                 if ( $patrolled ) {
1215                                                         PatrolLog::record( $rc, true );
1216                                                 }
1217                                         }
1218                                         $user->incEditCount();
1219                                         $dbw->commit();
1220                                 }
1221                         }
1222
1223                         if ( !$wgDBtransactions ) {
1224                                 ignore_user_abort( $userAbort );
1225                         }
1226
1227                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1228                         if ( !$status->isOK() ) {
1229                                 wfProfileOut( __METHOD__ );
1230                                 return $status;
1231                         }
1232
1233                         # Update links tables, site stats, etc.
1234                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1235                                 'oldcountable' => $oldcountable ) );
1236
1237                         if ( !$changed ) {
1238                                 $status->warning( 'edit-no-change' );
1239                                 $revision = null;
1240                                 // Keep the same revision ID, but do some updates on it
1241                                 $revisionId = $this->getLatest();
1242                                 // Update page_touched, this is usually implicit in the page update
1243                                 // Other cache updates are done in onArticleEdit()
1244                                 $this->mTitle->invalidateCache();
1245                         }
1246                 } else {
1247                         # Create new article
1248                         $status->value['new'] = true;
1249
1250                         $dbw->begin();
1251
1252                         # Add the page record; stake our claim on this title!
1253                         # This will return false if the article already exists
1254                         $newid = $this->insertOn( $dbw );
1255
1256                         if ( $newid === false ) {
1257                                 $dbw->rollback();
1258                                 $status->fatal( 'edit-already-exists' );
1259
1260                                 wfProfileOut( __METHOD__ );
1261                                 return $status;
1262                         }
1263
1264                         # Save the revision text...
1265                         $revision = new Revision( array(
1266                                 'page'       => $newid,
1267                                 'comment'    => $summary,
1268                                 'minor_edit' => $isminor,
1269                                 'text'       => $text,
1270                                 'user'       => $user->getId(),
1271                                 'user_text'  => $user->getName(),
1272                                 'timestamp'  => $now
1273                         ) );
1274                         $revisionId = $revision->insertOn( $dbw );
1275
1276                         # Update the page record with revision data
1277                         $this->updateRevisionOn( $dbw, $revision, 0 );
1278
1279                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1280
1281                         # Update recentchanges
1282                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1283                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1284
1285                                 # Mark as patrolled if the user can do so
1286                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1287                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1288                                 # Add RC row to the DB
1289                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1290                                         '', strlen( $text ), $revisionId, $patrolled );
1291
1292                                 # Log auto-patrolled edits
1293                                 if ( $patrolled ) {
1294                                         PatrolLog::record( $rc, true );
1295                                 }
1296                         }
1297                         $user->incEditCount();
1298                         $dbw->commit();
1299
1300                         # Update links, etc.
1301                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1302
1303                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1304                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1305                 }
1306
1307                 # Do updates right now unless deferral was requested
1308                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1309                         DeferredUpdates::doUpdates();
1310                 }
1311
1312                 // Return the new revision (or null) to the caller
1313                 $status->value['revision'] = $revision;
1314
1315                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1316                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1317
1318                 # Promote user to any groups they meet the criteria for
1319                 $user->addAutopromoteOnceGroups( 'onEdit' );
1320
1321                 wfProfileOut( __METHOD__ );
1322                 return $status;
1323         }
1324
1325         /**
1326          * Update the article's restriction field, and leave a log entry.
1327          * This works for protection both existing and non-existing pages.
1328          *
1329          * @param $limit Array: set of restriction keys
1330          * @param $reason String
1331          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1332          * @param $expiry Array: per restriction type expiration
1333          * @param $user User The user updating the restrictions
1334          * @return bool true on success
1335          */
1336         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1337                 global $wgContLang;
1338
1339                 if ( wfReadOnly() ) {
1340                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1341                 }
1342
1343                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1344
1345                 $id = $this->mTitle->getArticleID();
1346
1347                 if ( !$cascade ) {
1348                         $cascade = false;
1349                 }
1350
1351                 // Take this opportunity to purge out expired restrictions
1352                 Title::purgeExpiredRestrictions();
1353
1354                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1355                 # we expect a single selection, but the schema allows otherwise.
1356                 $isProtected = false;
1357                 $protect = false;
1358                 $changed = false;
1359
1360                 $dbw = wfGetDB( DB_MASTER );
1361
1362                 foreach ( $restrictionTypes as $action ) {
1363                         if ( !isset( $expiry[$action] ) ) {
1364                                 $expiry[$action] = $dbw->getInfinity();
1365                         }
1366                         if ( !isset( $limit[$action] ) ) {
1367                                 $limit[$action] = '';
1368                         } elseif ( $limit[$action] != '' ) {
1369                                 $protect = true;
1370                         }
1371
1372                         # Get current restrictions on $action
1373                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1374                         if ( $current != '' ) {
1375                                 $isProtected = true;
1376                         }
1377
1378                         if ( $limit[$action] != $current ) {
1379                                 $changed = true;
1380                         } elseif ( $limit[$action] != '' ) {
1381                                 # Only check expiry change if the action is actually being
1382                                 # protected, since expiry does nothing on an not-protected
1383                                 # action.
1384                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1385                                         $changed = true;
1386                                 }
1387                         }
1388                 }
1389
1390                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1391                         $changed = true;
1392                 }
1393
1394                 # If nothing's changed, do nothing
1395                 if ( !$changed ) {
1396                         return Status::newGood();
1397                 }
1398
1399                 if ( !$protect ) { # No protection at all means unprotection
1400                         $revCommentMsg = 'unprotectedarticle';
1401                         $logAction = 'unprotect';
1402                 } elseif ( $isProtected ) {
1403                         $revCommentMsg = 'modifiedarticleprotection';
1404                         $logAction = 'modify';
1405                 } else {
1406                         $revCommentMsg = 'protectedarticle';
1407                         $logAction = 'protect';
1408                 }
1409
1410                 $encodedExpiry = array();
1411                 $protectDescription = '';
1412                 foreach ( $limit as $action => $restrictions ) {
1413                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1414                         if ( $restrictions != '' ) {
1415                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1416                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1417                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
1418                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1419                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1420                                                 $wgContLang->time( $expiry[$action], false, false ) );
1421                                 } else {
1422                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
1423                                 }
1424
1425                                 $protectDescription .= ') ';
1426                         }
1427                 }
1428                 $protectDescription = trim( $protectDescription );
1429
1430                 if ( $id ) { # Protection of existing page
1431                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1432                                 return Status::newGood();
1433                         }
1434
1435                         # Only restrictions with the 'protect' right can cascade...
1436                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1437                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1438
1439                         # The schema allows multiple restrictions
1440                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1441                                 $cascade = false;
1442                         }
1443
1444                         # Update restrictions table
1445                         foreach ( $limit as $action => $restrictions ) {
1446                                 if ( $restrictions != '' ) {
1447                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1448                                                 array( 'pr_page' => $id,
1449                                                         'pr_type' => $action,
1450                                                         'pr_level' => $restrictions,
1451                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1452                                                         'pr_expiry' => $encodedExpiry[$action]
1453                                                 ),
1454                                                 __METHOD__
1455                                         );
1456                                 } else {
1457                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1458                                                 'pr_type' => $action ), __METHOD__ );
1459                                 }
1460                         }
1461
1462                         # Prepare a null revision to be added to the history
1463                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
1464                         if ( $reason ) {
1465                                 $editComment .= ": $reason";
1466                         }
1467                         if ( $protectDescription ) {
1468                                 $editComment .= " ($protectDescription)";
1469                         }
1470                         if ( $cascade ) {
1471                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1472                         }
1473
1474                         # Insert a null revision
1475                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1476                         $nullRevId = $nullRevision->insertOn( $dbw );
1477
1478                         $latest = $this->getLatest();
1479                         # Update page record
1480                         $dbw->update( 'page',
1481                                 array( /* SET */
1482                                         'page_touched' => $dbw->timestamp(),
1483                                         'page_restrictions' => '',
1484                                         'page_latest' => $nullRevId
1485                                 ), array( /* WHERE */
1486                                         'page_id' => $id
1487                                 ), __METHOD__
1488                         );
1489
1490                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1491                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1492                 } else { # Protection of non-existing page (also known as "title protection")
1493                         # Cascade protection is meaningless in this case
1494                         $cascade = false;
1495
1496                         if ( $limit['create'] != '' ) {
1497                                 $dbw->replace( 'protected_titles',
1498                                         array( array( 'pt_namespace', 'pt_title' ) ),
1499                                         array(
1500                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1501                                                 'pt_title' => $this->mTitle->getDBkey(),
1502                                                 'pt_create_perm' => $limit['create'],
1503                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
1504                                                 'pt_expiry' => $encodedExpiry['create'],
1505                                                 'pt_user' => $user->getId(),
1506                                                 'pt_reason' => $reason,
1507                                         ), __METHOD__
1508                                 );
1509                         } else {
1510                                 $dbw->delete( 'protected_titles',
1511                                         array(
1512                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1513                                                 'pt_title' => $this->mTitle->getDBkey()
1514                                         ), __METHOD__
1515                                 );
1516                         }
1517                 }
1518
1519                 $this->mTitle->flushRestrictions();
1520
1521                 if ( $logAction == 'unprotect' ) {
1522                         $logParams = array();
1523                 } else {
1524                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
1525                 }
1526
1527                 # Update the protection log
1528                 $log = new LogPage( 'protect' );
1529                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams );
1530
1531                 return Status::newGood();
1532         }
1533
1534         /**
1535          * Take an array of page restrictions and flatten it to a string
1536          * suitable for insertion into the page_restrictions field.
1537          * @param $limit Array
1538          * @return String
1539          */
1540         protected static function flattenRestrictions( $limit ) {
1541                 if ( !is_array( $limit ) ) {
1542                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1543                 }
1544
1545                 $bits = array();
1546                 ksort( $limit );
1547
1548                 foreach ( $limit as $action => $restrictions ) {
1549                         if ( $restrictions != '' ) {
1550                                 $bits[] = "$action=$restrictions";
1551                         }
1552                 }
1553
1554                 return implode( ':', $bits );
1555         }
1556
1557         /**
1558          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1559          */
1560         public function isBigDeletion() {
1561                 global $wgDeleteRevisionsLimit;
1562
1563                 if ( $wgDeleteRevisionsLimit ) {
1564                         $revCount = $this->estimateRevisionCount();
1565
1566                         return $revCount > $wgDeleteRevisionsLimit;
1567                 }
1568
1569                 return false;
1570         }
1571
1572         /**
1573          * @return int approximate revision count
1574          */
1575         public function estimateRevisionCount() {
1576                 $dbr = wfGetDB( DB_SLAVE );
1577                 return $dbr->estimateRowCount( 'revision', '*',
1578                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1579         }
1580
1581         /**
1582          * Get the last N authors
1583          * @param $num Integer: number of revisions to get
1584          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1585          * @return array Array of authors, duplicates not removed
1586          */
1587         public function getLastNAuthors( $num, $revLatest = 0 ) {
1588                 wfProfileIn( __METHOD__ );
1589                 // First try the slave
1590                 // If that doesn't have the latest revision, try the master
1591                 $continue = 2;
1592                 $db = wfGetDB( DB_SLAVE );
1593
1594                 do {
1595                         $res = $db->select( array( 'page', 'revision' ),
1596                                 array( 'rev_id', 'rev_user_text' ),
1597                                 array(
1598                                         'page_namespace' => $this->mTitle->getNamespace(),
1599                                         'page_title' => $this->mTitle->getDBkey(),
1600                                         'rev_page = page_id'
1601                                 ), __METHOD__,
1602                                 array(
1603                                         'ORDER BY' => 'rev_timestamp DESC',
1604                                         'LIMIT' => $num
1605                                 )
1606                         );
1607
1608                         if ( !$res ) {
1609                                 wfProfileOut( __METHOD__ );
1610                                 return array();
1611                         }
1612
1613                         $row = $db->fetchObject( $res );
1614
1615                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1616                                 $db = wfGetDB( DB_MASTER );
1617                                 $continue--;
1618                         } else {
1619                                 $continue = 0;
1620                         }
1621                 } while ( $continue );
1622
1623                 $authors = array( $row->rev_user_text );
1624
1625                 foreach ( $res as $row ) {
1626                         $authors[] = $row->rev_user_text;
1627                 }
1628
1629                 wfProfileOut( __METHOD__ );
1630                 return $authors;
1631         }
1632
1633         /**
1634          * Back-end article deletion
1635          * Deletes the article with database consistency, writes logs, purges caches
1636          *
1637          * @param $reason string delete reason for deletion log
1638          * @param $suppress bitfield
1639          *      Revision::DELETED_TEXT
1640          *      Revision::DELETED_COMMENT
1641          *      Revision::DELETED_USER
1642          *      Revision::DELETED_RESTRICTED
1643          * @param $id int article ID
1644          * @param $commit boolean defaults to true, triggers transaction end
1645          * @param &$errors Array of errors to append to
1646          * @param $user User The relevant user
1647          * @return boolean true if successful
1648          */
1649         public function doDeleteArticle(
1650                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1651         ) {
1652                 global $wgUser;
1653                 $user = is_null( $user ) ? $wgUser : $user;
1654
1655                 wfDebug( __METHOD__ . "\n" );
1656
1657                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1658                         return false;
1659                 }
1660                 $dbw = wfGetDB( DB_MASTER );
1661                 $t = $this->mTitle->getDBkey();
1662                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1663
1664                 if ( $t === '' || $id == 0 ) {
1665                         return false;
1666                 }
1667
1668                 DeferredUpdates::addUpdate(
1669                         new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 )
1670                 );
1671
1672                 // Bitfields to further suppress the content
1673                 if ( $suppress ) {
1674                         $bitfield = 0;
1675                         // This should be 15...
1676                         $bitfield |= Revision::DELETED_TEXT;
1677                         $bitfield |= Revision::DELETED_COMMENT;
1678                         $bitfield |= Revision::DELETED_USER;
1679                         $bitfield |= Revision::DELETED_RESTRICTED;
1680                 } else {
1681                         $bitfield = 'rev_deleted';
1682                 }
1683
1684                 $dbw->begin();
1685                 // For now, shunt the revision data into the archive table.
1686                 // Text is *not* removed from the text table; bulk storage
1687                 // is left intact to avoid breaking block-compression or
1688                 // immutable storage schemes.
1689                 //
1690                 // For backwards compatibility, note that some older archive
1691                 // table entries will have ar_text and ar_flags fields still.
1692                 //
1693                 // In the future, we may keep revisions and mark them with
1694                 // the rev_deleted field, which is reserved for this purpose.
1695                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1696                         array(
1697                                 'ar_namespace'  => 'page_namespace',
1698                                 'ar_title'      => 'page_title',
1699                                 'ar_comment'    => 'rev_comment',
1700                                 'ar_user'       => 'rev_user',
1701                                 'ar_user_text'  => 'rev_user_text',
1702                                 'ar_timestamp'  => 'rev_timestamp',
1703                                 'ar_minor_edit' => 'rev_minor_edit',
1704                                 'ar_rev_id'     => 'rev_id',
1705                                 'ar_parent_id'  => 'rev_parent_id',
1706                                 'ar_text_id'    => 'rev_text_id',
1707                                 'ar_text'       => '\'\'', // Be explicit to appease
1708                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1709                                 'ar_len'        => 'rev_len',
1710                                 'ar_page_id'    => 'page_id',
1711                                 'ar_deleted'    => $bitfield,
1712                                 'ar_sha1'       => 'rev_sha1'
1713                         ), array(
1714                                 'page_id' => $id,
1715                                 'page_id = rev_page'
1716                         ), __METHOD__
1717                 );
1718
1719                 # Delete restrictions for it
1720                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1721
1722                 # Now that it's safely backed up, delete it
1723                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1724                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1725
1726                 if ( !$ok ) {
1727                         $dbw->rollback();
1728                         return false;
1729                 }
1730
1731                 # Fix category table counts
1732                 $cats = array();
1733                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1734
1735                 foreach ( $res as $row ) {
1736                         $cats [] = $row->cl_to;
1737                 }
1738
1739                 $this->updateCategoryCounts( array(), $cats );
1740
1741                 # If using cascading deletes, we can skip some explicit deletes
1742                 if ( !$dbw->cascadingDeletes() ) {
1743                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1744
1745                         # Delete outgoing links
1746                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
1747                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
1748                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
1749                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
1750                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
1751                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
1752                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
1753                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
1754                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
1755                 }
1756
1757                 # If using cleanup triggers, we can skip some manual deletes
1758                 if ( !$dbw->cleanupTriggers() ) {
1759                         # Clean up recentchanges entries...
1760                         $dbw->delete( 'recentchanges',
1761                                 array( 'rc_type != ' . RC_LOG,
1762                                         'rc_namespace' => $this->mTitle->getNamespace(),
1763                                         'rc_title' => $this->mTitle->getDBkey() ),
1764                                 __METHOD__ );
1765                         $dbw->delete( 'recentchanges',
1766                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1767                                 __METHOD__ );
1768                 }
1769
1770                 # Clear caches
1771                 self::onArticleDelete( $this->mTitle );
1772
1773                 # Clear the cached article id so the interface doesn't act like we exist
1774                 $this->mTitle->resetArticleID( 0 );
1775
1776                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1777                 $logtype = $suppress ? 'suppress' : 'delete';
1778
1779                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
1780                 $logEntry->setPerformer( $user );
1781                 $logEntry->setTarget( $this->mTitle );
1782                 $logEntry->setComment( $reason );
1783                 $logid = $logEntry->insert();
1784                 $logEntry->publish( $logid );
1785
1786                 if ( $commit ) {
1787                         $dbw->commit();
1788                 }
1789
1790                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1791                 return true;
1792         }
1793
1794         /**
1795          * Roll back the most recent consecutive set of edits to a page
1796          * from the same user; fails if there are no eligible edits to
1797          * roll back to, e.g. user is the sole contributor. This function
1798          * performs permissions checks on $user, then calls commitRollback()
1799          * to do the dirty work
1800          *
1801          * @todo: seperate the business/permission stuff out from backend code
1802          *
1803          * @param $fromP String: Name of the user whose edits to rollback.
1804          * @param $summary String: Custom summary. Set to default summary if empty.
1805          * @param $token String: Rollback token.
1806          * @param $bot Boolean: If true, mark all reverted edits as bot.
1807          *
1808          * @param $resultDetails Array: contains result-specific array of additional values
1809          *    'alreadyrolled' : 'current' (rev)
1810          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1811          *
1812          * @param $user User The user performing the rollback
1813          * @return array of errors, each error formatted as
1814          *   array(messagekey, param1, param2, ...).
1815          * On success, the array is empty.  This array can also be passed to
1816          * OutputPage::showPermissionsErrorPage().
1817          */
1818         public function doRollback(
1819                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1820         ) {
1821                 $resultDetails = null;
1822
1823                 # Check permissions
1824                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1825                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1826                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1827
1828                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1829                         $errors[] = array( 'sessionfailure' );
1830                 }
1831
1832                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1833                         $errors[] = array( 'actionthrottledtext' );
1834                 }
1835
1836                 # If there were errors, bail out now
1837                 if ( !empty( $errors ) ) {
1838                         return $errors;
1839                 }
1840
1841                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1842         }
1843
1844         /**
1845          * Backend implementation of doRollback(), please refer there for parameter
1846          * and return value documentation
1847          *
1848          * NOTE: This function does NOT check ANY permissions, it just commits the
1849          * rollback to the DB. Therefore, you should only call this function direct-
1850          * ly if you want to use custom permissions checks. If you don't, use
1851          * doRollback() instead.
1852          * @param $fromP String: Name of the user whose edits to rollback.
1853          * @param $summary String: Custom summary. Set to default summary if empty.
1854          * @param $bot Boolean: If true, mark all reverted edits as bot.
1855          *
1856          * @param $resultDetails Array: contains result-specific array of additional values
1857          * @param $guser User The user performing the rollback
1858          */
1859         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1860                 global $wgUseRCPatrol, $wgContLang;
1861
1862                 $dbw = wfGetDB( DB_MASTER );
1863
1864                 if ( wfReadOnly() ) {
1865                         return array( array( 'readonlytext' ) );
1866                 }
1867
1868                 # Get the last editor
1869                 $current = Revision::newFromTitle( $this->mTitle );
1870                 if ( is_null( $current ) ) {
1871                         # Something wrong... no page?
1872                         return array( array( 'notanarticle' ) );
1873                 }
1874
1875                 $from = str_replace( '_', ' ', $fromP );
1876                 # User name given should match up with the top revision.
1877                 # If the user was deleted then $from should be empty.
1878                 if ( $from != $current->getUserText() ) {
1879                         $resultDetails = array( 'current' => $current );
1880                         return array( array( 'alreadyrolled',
1881                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1882                                 htmlspecialchars( $fromP ),
1883                                 htmlspecialchars( $current->getUserText() )
1884                         ) );
1885                 }
1886
1887                 # Get the last edit not by this guy...
1888                 # Note: these may not be public values
1889                 $user = intval( $current->getRawUser() );
1890                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1891                 $s = $dbw->selectRow( 'revision',
1892                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1893                         array( 'rev_page' => $current->getPage(),
1894                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1895                         ), __METHOD__,
1896                         array( 'USE INDEX' => 'page_timestamp',
1897                                 'ORDER BY' => 'rev_timestamp DESC' )
1898                         );
1899                 if ( $s === false ) {
1900                         # No one else ever edited this page
1901                         return array( array( 'cantrollback' ) );
1902                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1903                         # Only admins can see this text
1904                         return array( array( 'notvisiblerev' ) );
1905                 }
1906
1907                 $set = array();
1908                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1909                         # Mark all reverted edits as bot
1910                         $set['rc_bot'] = 1;
1911                 }
1912
1913                 if ( $wgUseRCPatrol ) {
1914                         # Mark all reverted edits as patrolled
1915                         $set['rc_patrolled'] = 1;
1916                 }
1917
1918                 if ( count( $set ) ) {
1919                         $dbw->update( 'recentchanges', $set,
1920                                 array( /* WHERE */
1921                                         'rc_cur_id' => $current->getPage(),
1922                                         'rc_user_text' => $current->getUserText(),
1923                                         "rc_timestamp > '{$s->rev_timestamp}'",
1924                                 ), __METHOD__
1925                         );
1926                 }
1927
1928                 # Generate the edit summary if necessary
1929                 $target = Revision::newFromId( $s->rev_id );
1930                 if ( empty( $summary ) ) {
1931                         if ( $from == '' ) { // no public user name
1932                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1933                         } else {
1934                                 $summary = wfMsgForContent( 'revertpage' );
1935                         }
1936                 }
1937
1938                 # Allow the custom summary to use the same args as the default message
1939                 $args = array(
1940                         $target->getUserText(), $from, $s->rev_id,
1941                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1942                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1943                 );
1944                 $summary = wfMsgReplaceArgs( $summary, $args );
1945
1946                 # Save
1947                 $flags = EDIT_UPDATE;
1948
1949                 if ( $guser->isAllowed( 'minoredit' ) ) {
1950                         $flags |= EDIT_MINOR;
1951                 }
1952
1953                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1954                         $flags |= EDIT_FORCE_BOT;
1955                 }
1956
1957                 # Actually store the edit
1958                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1959                 if ( !empty( $status->value['revision'] ) ) {
1960                         $revId = $status->value['revision']->getId();
1961                 } else {
1962                         $revId = false;
1963                 }
1964
1965                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1966
1967                 $resultDetails = array(
1968                         'summary' => $summary,
1969                         'current' => $current,
1970                         'target'  => $target,
1971                         'newid'   => $revId
1972                 );
1973
1974                 return array();
1975         }
1976
1977         /**
1978          * Do standard deferred updates after page view
1979          * @param $user User The relevant user
1980          */
1981         public function doViewUpdates( User $user ) {
1982                 global $wgDisableCounters;
1983                 if ( wfReadOnly() ) {
1984                         return;
1985                 }
1986
1987                 # Don't update page view counters on views from bot users (bug 14044)
1988                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1989                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1990                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1991                 }
1992
1993                 # Update newtalk / watchlist notification status
1994                 $user->clearNotification( $this->mTitle );
1995         }
1996
1997         /**
1998          * Prepare text which is about to be saved.
1999          * Returns a stdclass with source, pst and output members
2000          */
2001         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2002                 global $wgParser, $wgContLang, $wgUser;
2003                 $user = is_null( $user ) ? $wgUser : $user;
2004                 // @TODO fixme: check $user->getId() here???
2005                 if ( $this->mPreparedEdit
2006                         && $this->mPreparedEdit->newText == $text
2007                         && $this->mPreparedEdit->revid == $revid
2008                 ) {
2009                         // Already prepared
2010                         return $this->mPreparedEdit;
2011                 }
2012
2013                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2014                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2015
2016                 $edit = (object)array();
2017                 $edit->revid = $revid;
2018                 $edit->newText = $text;
2019                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2020                 $edit->popts = $this->makeParserOptions( 'canonical' );
2021
2022                 // Bug 32858: For a CSS/JS page, put a blank parser output into the
2023                 // prepared edit, so that links etc. won't be registered in the
2024                 // database. We could have set $edit->output to false or something if
2025                 // we thought of this bug earlier, but now that would break the
2026                 // interface with AbuseFilter etc.
2027                 if ( $this->mTitle->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
2028                         $input = '';
2029                 } else {
2030                         $input = $edit->pst;
2031                 }
2032                 $edit->output = $wgParser->parse( $input, $this->mTitle, $edit->popts, true, true, $revid );
2033                 $edit->oldText = $this->getRawText();
2034
2035                 $this->mPreparedEdit = $edit;
2036
2037                 return $edit;
2038         }
2039
2040         /**
2041          * Do standard deferred updates after page edit.
2042          * Update links tables, site stats, search index and message cache.
2043          * Purges pages that include this page if the text was changed here.
2044          * Every 100th edit, prune the recent changes table.
2045          *
2046          * @private
2047          * @param $revision Revision object
2048          * @param $user User object that did the revision
2049          * @param $options Array of options, following indexes are used:
2050          * - changed: boolean, whether the revision changed the content (default true)
2051          * - created: boolean, whether the revision created the page (default false)
2052          * - oldcountable: boolean or null (default null):
2053          *   - boolean: whether the page was counted as an article before that
2054          *     revision, only used in changed is true and created is false
2055          *   - null: don't change the article count
2056          */
2057         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2058                 global $wgEnableParserCache;
2059
2060                 wfProfileIn( __METHOD__ );
2061
2062                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2063                 $text = $revision->getText();
2064
2065                 # Parse the text
2066                 # Be careful not to double-PST: $text is usually already PST-ed once
2067                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2068                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2069                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
2070                 } else {
2071                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2072                         $editInfo = $this->mPreparedEdit;
2073                 }
2074
2075                 # Save it to the parser cache
2076                 if ( $wgEnableParserCache ) {
2077                         $parserCache = ParserCache::singleton();
2078                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2079                 }
2080
2081                 # Update the links tables
2082                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2083                 $u->doUpdate();
2084
2085                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2086
2087                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2088                         if ( 0 == mt_rand( 0, 99 ) ) {
2089                                 // Flush old entries from the `recentchanges` table; we do this on
2090                                 // random requests so as to avoid an increase in writes for no good reason
2091                                 global $wgRCMaxAge;
2092
2093                                 $dbw = wfGetDB( DB_MASTER );
2094                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2095                                 $dbw->delete(
2096                                         'recentchanges',
2097                                         array( "rc_timestamp < '$cutoff'" ),
2098                                         __METHOD__
2099                                 );
2100                         }
2101                 }
2102
2103                 if ( !$this->mTitle->exists() ) {
2104                         wfProfileOut( __METHOD__ );
2105                         return;
2106                 }
2107
2108                 $id = $this->getId();
2109                 $title = $this->mTitle->getPrefixedDBkey();
2110                 $shortTitle = $this->mTitle->getDBkey();
2111
2112                 if ( !$options['changed'] ) {
2113                         $good = 0;
2114                         $total = 0;
2115                 } elseif ( $options['created'] ) {
2116                         $good = (int)$this->isCountable( $editInfo );
2117                         $total = 1;
2118                 } elseif ( $options['oldcountable'] !== null ) {
2119                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2120                         $total = 0;
2121                 } else {
2122                         $good = 0;
2123                         $total = 0;
2124                 }
2125
2126                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2127                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
2128
2129                 # If this is another user's talk page, update newtalk.
2130                 # Don't do this if $options['changed'] = false (null-edits) nor if
2131                 # it's a minor edit and the user doesn't want notifications for those.
2132                 if ( $options['changed']
2133                         && $this->mTitle->getNamespace() == NS_USER_TALK
2134                         && $shortTitle != $user->getTitleKey()
2135                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2136                 ) {
2137                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2138                                 $other = User::newFromName( $shortTitle, false );
2139                                 if ( !$other ) {
2140                                         wfDebug( __METHOD__ . ": invalid username\n" );
2141                                 } elseif ( User::isIP( $shortTitle ) ) {
2142                                         // An anonymous user
2143                                         $other->setNewtalk( true );
2144                                 } elseif ( $other->isLoggedIn() ) {
2145                                         $other->setNewtalk( true );
2146                                 } else {
2147                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2148                                 }
2149                         }
2150                 }
2151
2152                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2153                         MessageCache::singleton()->replace( $shortTitle, $text );
2154                 }
2155
2156                 if( $options['created'] ) {
2157                         self::onArticleCreate( $this->mTitle );
2158                 } else {
2159                         self::onArticleEdit( $this->mTitle );
2160                 }
2161
2162                 wfProfileOut( __METHOD__ );
2163         }
2164
2165         /**
2166          * Perform article updates on a special page creation.
2167          *
2168          * @param $rev Revision object
2169          *
2170          * @todo This is a shitty interface function. Kill it and replace the
2171          * other shitty functions like doEditUpdates and such so it's not needed
2172          * anymore.
2173          * @deprecated since 1.18, use doEditUpdates()
2174          */
2175         public function createUpdates( $rev ) {
2176                 wfDeprecated( __METHOD__, '1.18' );
2177                 global $wgUser;
2178                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2179         }
2180
2181         /**
2182          * This function is called right before saving the wikitext,
2183          * so we can do things like signatures and links-in-context.
2184          *
2185          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2186          * @param $text String article contents
2187          * @param $user User object: user doing the edit
2188          * @param $popts ParserOptions object: parser options, default options for
2189          *               the user loaded if null given
2190          * @return string article contents with altered wikitext markup (signatures
2191          *      converted, {{subst:}}, templates, etc.)
2192          */
2193         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2194                 global $wgParser, $wgUser;
2195
2196                 wfDeprecated( __METHOD__, '1.19' );
2197
2198                 $user = is_null( $user ) ? $wgUser : $user;
2199
2200                 if ( $popts === null ) {
2201                         $popts = ParserOptions::newFromUser( $user );
2202                 }
2203
2204                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2205         }
2206
2207         /**
2208          * Loads page_touched and returns a value indicating if it should be used
2209          * @return boolean true if not a redirect
2210          */
2211         public function checkTouched() {
2212                 if ( !$this->mDataLoaded ) {
2213                         $this->loadPageData();
2214                 }
2215                 return !$this->mIsRedirect;
2216         }
2217
2218         /**
2219          * Get the page_touched field
2220          * @return string containing GMT timestamp
2221          */
2222         public function getTouched() {
2223                 if ( !$this->mDataLoaded ) {
2224                         $this->loadPageData();
2225                 }
2226                 return $this->mTouched;
2227         }
2228
2229         /**
2230          * Get the page_latest field
2231          * @return integer rev_id of current revision
2232          */
2233         public function getLatest() {
2234                 if ( !$this->mDataLoaded ) {
2235                         $this->loadPageData();
2236                 }
2237                 return (int)$this->mLatest;
2238         }
2239
2240         /**
2241          * Edit an article without doing all that other stuff
2242          * The article must already exist; link tables etc
2243          * are not updated, caches are not flushed.
2244          *
2245          * @param $text String: text submitted
2246          * @param $user User The relevant user
2247          * @param $comment String: comment submitted
2248          * @param $minor Boolean: whereas it's a minor modification
2249          */
2250         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2251                 wfProfileIn( __METHOD__ );
2252
2253                 $dbw = wfGetDB( DB_MASTER );
2254                 $revision = new Revision( array(
2255                         'page'       => $this->getId(),
2256                         'text'       => $text,
2257                         'comment'    => $comment,
2258                         'minor_edit' => $minor ? 1 : 0,
2259                 ) );
2260                 $revision->insertOn( $dbw );
2261                 $this->updateRevisionOn( $dbw, $revision );
2262
2263                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2264
2265                 wfProfileOut( __METHOD__ );
2266         }
2267
2268         /**
2269          * The onArticle*() functions are supposed to be a kind of hooks
2270          * which should be called whenever any of the specified actions
2271          * are done.
2272          *
2273          * This is a good place to put code to clear caches, for instance.
2274          *
2275          * This is called on page move and undelete, as well as edit
2276          *
2277          * @param $title Title object
2278          */
2279         public static function onArticleCreate( $title ) {
2280                 # Update existence markers on article/talk tabs...
2281                 if ( $title->isTalkPage() ) {
2282                         $other = $title->getSubjectPage();
2283                 } else {
2284                         $other = $title->getTalkPage();
2285                 }
2286
2287                 $other->invalidateCache();
2288                 $other->purgeSquid();
2289
2290                 $title->touchLinks();
2291                 $title->purgeSquid();
2292                 $title->deleteTitleProtection();
2293         }
2294
2295         /**
2296          * Clears caches when article is deleted
2297          *
2298          * @param $title Title
2299          */
2300         public static function onArticleDelete( $title ) {
2301                 # Update existence markers on article/talk tabs...
2302                 if ( $title->isTalkPage() ) {
2303                         $other = $title->getSubjectPage();
2304                 } else {
2305                         $other = $title->getTalkPage();
2306                 }
2307
2308                 $other->invalidateCache();
2309                 $other->purgeSquid();
2310
2311                 $title->touchLinks();
2312                 $title->purgeSquid();
2313
2314                 # File cache
2315                 HTMLFileCache::clearFileCache( $title );
2316
2317                 # Messages
2318                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2319                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2320                 }
2321
2322                 # Images
2323                 if ( $title->getNamespace() == NS_FILE ) {
2324                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2325                         $update->doUpdate();
2326                 }
2327
2328                 # User talk pages
2329                 if ( $title->getNamespace() == NS_USER_TALK ) {
2330                         $user = User::newFromName( $title->getText(), false );
2331                         if ( $user ) {
2332                                 $user->setNewtalk( false );
2333                         }
2334                 }
2335
2336                 # Image redirects
2337                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2338         }
2339
2340         /**
2341          * Purge caches on page update etc
2342          *
2343          * @param $title Title object
2344          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2345          */
2346         public static function onArticleEdit( $title ) {
2347                 // Invalidate caches of articles which include this page
2348                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2349
2350
2351                 // Invalidate the caches of all pages which redirect here
2352                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2353
2354                 # Purge squid for this page only
2355                 $title->purgeSquid();
2356
2357                 # Clear file cache for this page only
2358                 HTMLFileCache::clearFileCache( $title );
2359         }
2360
2361         /**#@-*/
2362
2363         /**
2364          * Return a list of templates used by this article.
2365          * Uses the templatelinks table
2366          *
2367          * @return Array of Title objects
2368          */
2369         public function getUsedTemplates() {
2370                 $result = array();
2371                 $id = $this->mTitle->getArticleID();
2372
2373                 if ( $id == 0 ) {
2374                         return array();
2375                 }
2376
2377                 $dbr = wfGetDB( DB_SLAVE );
2378                 $res = $dbr->select( array( 'templatelinks' ),
2379                         array( 'tl_namespace', 'tl_title' ),
2380                         array( 'tl_from' => $id ),
2381                         __METHOD__ );
2382
2383                 if ( $res !== false ) {
2384                         foreach ( $res as $row ) {
2385                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2386                         }
2387                 }
2388
2389                 return $result;
2390         }
2391
2392         /**
2393          * Returns a list of hidden categories this page is a member of.
2394          * Uses the page_props and categorylinks tables.
2395          *
2396          * @return Array of Title objects
2397          */
2398         public function getHiddenCategories() {
2399                 $result = array();
2400                 $id = $this->mTitle->getArticleID();
2401
2402                 if ( $id == 0 ) {
2403                         return array();
2404                 }
2405
2406                 $dbr = wfGetDB( DB_SLAVE );
2407                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2408                         array( 'cl_to' ),
2409                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2410                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2411                         __METHOD__ );
2412
2413                 if ( $res !== false ) {
2414                         foreach ( $res as $row ) {
2415                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2416                         }
2417                 }
2418
2419                 return $result;
2420         }
2421
2422         /**
2423         * Return an applicable autosummary if one exists for the given edit.
2424         * @param $oldtext String: the previous text of the page.
2425         * @param $newtext String: The submitted text of the page.
2426         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2427         * @return string An appropriate autosummary, or an empty string.
2428         */
2429         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2430                 global $wgContLang;
2431
2432                 # Decide what kind of autosummary is needed.
2433
2434                 # Redirect autosummaries
2435                 $ot = Title::newFromRedirect( $oldtext );
2436                 $rt = Title::newFromRedirect( $newtext );
2437
2438                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2439                         $truncatedtext = $wgContLang->truncate(
2440                                 str_replace( "\n", ' ', $newtext ),
2441                                 max( 0, 250
2442                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2443                                         - strlen( $rt->getFullText() )
2444                                 ) );
2445                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2446                 }
2447
2448                 # New page autosummaries
2449                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2450                         # If they're making a new article, give its text, truncated, in the summary.
2451
2452                         $truncatedtext = $wgContLang->truncate(
2453                                 str_replace( "\n", ' ', $newtext ),
2454                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2455
2456                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2457                 }
2458
2459                 # Blanking autosummaries
2460                 if ( $oldtext != '' && $newtext == '' ) {
2461                         return wfMsgForContent( 'autosumm-blank' );
2462                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2463                         # Removing more than 90% of the article
2464
2465                         $truncatedtext = $wgContLang->truncate(
2466                                 $newtext,
2467                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2468
2469                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2470                 }
2471
2472                 # If we reach this point, there's no applicable autosummary for our case, so our
2473                 # autosummary is empty.
2474                 return '';
2475         }
2476
2477         /**
2478          * Auto-generates a deletion reason
2479          *
2480          * @param &$hasHistory Boolean: whether the page has a history
2481          * @return mixed String containing deletion reason or empty string, or boolean false
2482          *    if no revision occurred
2483          */
2484         public function getAutoDeleteReason( &$hasHistory ) {
2485                 global $wgContLang;
2486
2487                 $dbw = wfGetDB( DB_MASTER );
2488                 // Get the last revision
2489                 $rev = Revision::newFromTitle( $this->getTitle() );
2490
2491                 if ( is_null( $rev ) ) {
2492                         return false;
2493                 }
2494
2495                 // Get the article's contents
2496                 $contents = $rev->getText();
2497                 $blank = false;
2498
2499                 // If the page is blank, use the text from the previous revision,
2500                 // which can only be blank if there's a move/import/protect dummy revision involved
2501                 if ( $contents == '' ) {
2502                         $prev = $rev->getPrevious();
2503
2504                         if ( $prev )    {
2505                                 $contents = $prev->getText();
2506                                 $blank = true;
2507                         }
2508                 }
2509
2510                 // Find out if there was only one contributor
2511                 // Only scan the last 20 revisions
2512                 $res = $dbw->select( 'revision', 'rev_user_text',
2513                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2514                         __METHOD__,
2515                         array( 'LIMIT' => 20 )
2516                 );
2517
2518                 if ( $res === false ) {
2519                         // This page has no revisions, which is very weird
2520                         return false;
2521                 }
2522
2523                 $hasHistory = ( $res->numRows() > 1 );
2524                 $row = $dbw->fetchObject( $res );
2525
2526                 if ( $row ) { // $row is false if the only contributor is hidden
2527                         $onlyAuthor = $row->rev_user_text;
2528                         // Try to find a second contributor
2529                         foreach ( $res as $row ) {
2530                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2531                                         $onlyAuthor = false;
2532                                         break;
2533                                 }
2534                         }
2535                 } else {
2536                         $onlyAuthor = false;
2537                 }
2538
2539                 // Generate the summary with a '$1' placeholder
2540                 if ( $blank ) {
2541                         // The current revision is blank and the one before is also
2542                         // blank. It's just not our lucky day
2543                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2544                 } else {
2545                         if ( $onlyAuthor ) {
2546                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2547                         } else {
2548                                 $reason = wfMsgForContent( 'excontent', '$1' );
2549                         }
2550                 }
2551
2552                 if ( $reason == '-' ) {
2553                         // Allow these UI messages to be blanked out cleanly
2554                         return '';
2555                 }
2556
2557                 // Replace newlines with spaces to prevent uglyness
2558                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2559                 // Calculate the maximum amount of chars to get
2560                 // Max content length = max comment length - length of the comment (excl. $1)
2561                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2562                 $contents = $wgContLang->truncate( $contents, $maxLength );
2563                 // Remove possible unfinished links
2564                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2565                 // Now replace the '$1' placeholder
2566                 $reason = str_replace( '$1', $contents, $reason );
2567
2568                 return $reason;
2569         }
2570
2571         /**
2572         * Get parser options suitable for rendering the primary article wikitext
2573         * @param User|string $user User object or 'canonical'
2574         * @return ParserOptions
2575         */
2576         public function makeParserOptions( $user ) {
2577                 global $wgContLang;
2578                 if ( $user instanceof User ) { // settings per user (even anons)
2579                         $options = ParserOptions::newFromUser( $user );
2580                 } else { // canonical settings
2581                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
2582                 }
2583                 $options->enableLimitReport(); // show inclusion/loop reports
2584                 $options->setTidy( true ); // fix bad HTML
2585                 return $options;
2586         }
2587
2588         /**
2589          * Update all the appropriate counts in the category table, given that
2590          * we've added the categories $added and deleted the categories $deleted.
2591          *
2592          * @param $added array   The names of categories that were added
2593          * @param $deleted array The names of categories that were deleted
2594          */
2595         public function updateCategoryCounts( $added, $deleted ) {
2596                 $ns = $this->mTitle->getNamespace();
2597                 $dbw = wfGetDB( DB_MASTER );
2598
2599                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2600                 # exist, we might legitimately not create it, but it's simpler to just
2601                 # create it and then give it a negative value, since the value is bogus
2602                 # anyway.
2603                 #
2604                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2605                 $insertCats = array_merge( $added, $deleted );
2606                 if ( !$insertCats ) {
2607                         # Okay, nothing to do
2608                         return;
2609                 }
2610
2611                 $insertRows = array();
2612
2613                 foreach ( $insertCats as $cat ) {
2614                         $insertRows[] = array(
2615                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2616                                 'cat_title' => $cat
2617                         );
2618                 }
2619                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2620
2621                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2622                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2623
2624                 if ( $ns == NS_CATEGORY ) {
2625                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2626                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2627                 } elseif ( $ns == NS_FILE ) {
2628                         $addFields[]    = 'cat_files = cat_files + 1';
2629                         $removeFields[] = 'cat_files = cat_files - 1';
2630                 }
2631
2632                 if ( $added ) {
2633                         $dbw->update(
2634                                 'category',
2635                                 $addFields,
2636                                 array( 'cat_title' => $added ),
2637                                 __METHOD__
2638                         );
2639                 }
2640
2641                 if ( $deleted ) {
2642                         $dbw->update(
2643                                 'category',
2644                                 $removeFields,
2645                                 array( 'cat_title' => $deleted ),
2646                                 __METHOD__
2647                         );
2648                 }
2649         }
2650
2651         /**
2652          * Updates cascading protections
2653          *
2654          * @param $parserOutput ParserOutput object for the current version
2655          */
2656         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2657                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2658                         return;
2659                 }
2660
2661                 // templatelinks table may have become out of sync,
2662                 // especially if using variable-based transclusions.
2663                 // For paranoia, check if things have changed and if
2664                 // so apply updates to the database. This will ensure
2665                 // that cascaded protections apply as soon as the changes
2666                 // are visible.
2667
2668                 # Get templates from templatelinks
2669                 $id = $this->mTitle->getArticleID();
2670
2671                 $tlTemplates = array();
2672
2673                 $dbr = wfGetDB( DB_SLAVE );
2674                 $res = $dbr->select( array( 'templatelinks' ),
2675                         array( 'tl_namespace', 'tl_title' ),
2676                         array( 'tl_from' => $id ),
2677                         __METHOD__
2678                 );
2679
2680                 foreach ( $res as $row ) {
2681                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2682                 }
2683
2684                 # Get templates from parser output.
2685                 $poTemplates = array();
2686                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2687                         foreach ( $templates as $dbk => $id ) {
2688                                 $poTemplates["$ns:$dbk"] = true;
2689                         }
2690                 }
2691
2692                 # Get the diff
2693                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2694
2695                 if ( count( $templates_diff ) > 0 ) {
2696                         # Whee, link updates time.
2697                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2698                         $u->doUpdate();
2699                 }
2700         }
2701
2702         /**
2703          * Update the article's restriction field, and leave a log entry.
2704          *
2705          * @deprecated since 1.19
2706          * @param $limit Array: set of restriction keys
2707          * @param $reason String
2708          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2709          * @param $expiry Array: per restriction type expiration
2710          * @param $user User The user updating the restrictions
2711          * @return bool true on success
2712          */
2713         public function updateRestrictions(
2714                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2715         ) {
2716                 global $wgUser;
2717
2718                 $user = is_null( $user ) ? $wgUser : $user;
2719
2720                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2721         }
2722
2723         /**
2724          * @deprecated since 1.18
2725          */
2726         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2727                 wfDeprecated( __METHOD__, '1.18' );
2728                 global $wgUser;
2729                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2730         }
2731
2732         /**
2733          * @deprecated since 1.18
2734          */
2735         public function viewUpdates() {
2736                 wfDeprecated( __METHOD__, '1.18' );
2737                 global $wgUser;
2738                 return $this->doViewUpdates( $wgUser );
2739         }
2740
2741         /**
2742          * @deprecated since 1.18
2743          */
2744         public function useParserCache( $oldid ) {
2745                 wfDeprecated( __METHOD__, '1.18' );
2746                 global $wgUser;
2747                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2748         }
2749 }
2750
2751 class PoolWorkArticleView extends PoolCounterWork {
2752
2753         /**
2754          * @var Page
2755          */
2756         private $page;
2757
2758         /**
2759          * @var string
2760          */
2761         private $cacheKey;
2762
2763         /**
2764          * @var integer
2765          */
2766         private $revid;
2767
2768         /**
2769          * @var ParserOptions
2770          */
2771         private $parserOptions;
2772
2773         /**
2774          * @var string|null
2775          */
2776         private $text;
2777
2778         /**
2779          * @var ParserOutput|false
2780          */
2781         private $parserOutput = false;
2782
2783         /**
2784          * @var bool
2785          */
2786         private $isDirty = false;
2787
2788         /**
2789          * @var Status|false
2790          */
2791         private $error = false;
2792
2793         /**
2794          * Constructor
2795          *
2796          * @param $page Page
2797          * @param $revid Integer: ID of the revision being parsed
2798          * @param $useParserCache Boolean: whether to use the parser cache
2799          * @param $parserOptions parserOptions to use for the parse operation
2800          * @param $text String: text to parse or null to load it
2801          */
2802         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $text = null ) {
2803                 $this->page = $page;
2804                 $this->revid = $revid;
2805                 $this->cacheable = $useParserCache;
2806                 $this->parserOptions = $parserOptions;
2807                 $this->text = $text;
2808                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
2809                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
2810         }
2811
2812         /**
2813          * Get the ParserOutput from this object, or false in case of failure
2814          *
2815          * @return ParserOutput
2816          */
2817         public function getParserOutput() {
2818                 return $this->parserOutput;
2819         }
2820
2821         /**
2822          * Get whether the ParserOutput is a dirty one (i.e. expired)
2823          *
2824          * @return bool
2825          */
2826         public function getIsDirty() {
2827                 return $this->isDirty;
2828         }
2829
2830         /**
2831          * Get a Status object in case of error or false otherwise
2832          *
2833          * @return Status|false
2834          */
2835         public function getError() {
2836                 return $this->error;
2837         }
2838
2839         /**
2840          * @return bool
2841          */
2842         function doWork() {
2843                 global $wgParser, $wgUseFileCache;
2844
2845                 $isCurrent = $this->revid === $this->page->getLatest();
2846
2847                 if ( $this->text !== null ) {
2848                         $text = $this->text;
2849                 } elseif ( $isCurrent ) {
2850                         $text = $this->page->getRawText();
2851                 } else {
2852                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
2853                         if ( $rev === null ) {
2854                                 return false;
2855                         }
2856                         $text = $rev->getText();
2857                 }
2858
2859                 $time = - wfTime();
2860                 $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
2861                         $this->parserOptions, true, true, $this->revid );
2862                 $time += wfTime();
2863
2864                 # Timing hack
2865                 if ( $time > 3 ) {
2866                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2867                                 $this->page->getTitle()->getPrefixedDBkey() ) );
2868                 }
2869
2870                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
2871                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
2872                 }
2873
2874                 // Make sure file cache is not used on uncacheable content.
2875                 // Output that has magic words in it can still use the parser cache
2876                 // (if enabled), though it will generally expire sooner.
2877                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
2878                         $wgUseFileCache = false;
2879                 }
2880
2881                 if ( $isCurrent ) {
2882                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
2883                 }
2884
2885                 return true;
2886         }
2887
2888         /**
2889          * @return bool
2890          */
2891         function getCachedWork() {
2892                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
2893
2894                 if ( $this->parserOutput === false ) {
2895                         wfDebug( __METHOD__ . ": parser cache miss\n" );
2896                         return false;
2897                 } else {
2898                         wfDebug( __METHOD__ . ": parser cache hit\n" );
2899                         return true;
2900                 }
2901         }
2902
2903         /**
2904          * @return bool
2905          */
2906         function fallback() {
2907                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
2908
2909                 if ( $this->parserOutput === false ) {
2910                         wfDebugLog( 'dirty', "dirty missing\n" );
2911                         wfDebug( __METHOD__ . ": no dirty cache\n" );
2912                         return false;
2913                 } else {
2914                         wfDebug( __METHOD__ . ": sending dirty output\n" );
2915                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
2916                         $this->isDirty = true;
2917                         return true;
2918                 }
2919         }
2920
2921         /**
2922          * @param $status Status
2923          */
2924         function error( $status ) {
2925                 $this->error = $status;
2926                 return false;
2927         }
2928 }