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         // doDeleteArticleReal() return values. Values less than zero indicate fatal errors,
  17         // values greater than zero indicate that there were problems not resulting in page
  18         // not being deleted
  19
  20         /**
  21          * Delete operation aborted by hook
  22          */
  23         const DELETE_HOOK_ABORTED = -1;
  24
  25         /**
  26          * Deletion successful
  27          */
  28         const DELETE_SUCCESS = 0;
  29
  30         /**
  31          * Page not found
  32          */
  33         const DELETE_NO_PAGE = 1;
  34
  35         /**
  36          * No revisions found to delete
  37          */
  38         const DELETE_NO_REVISIONS = 2;
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         public $mPreparedEdit = false;       // !< Array
  52         /**@}}*/
  53
  54         /**
  55          * @var Title
  56          */
  57         protected $mRedirectTarget = null;
  58
  59         /**
  60          * @var Revision
  61          */
  62         protected $mLastRevision = null;
  63
  64         /**
  65          * @var string; timestamp of the current revision or empty string if not loaded
  66          */
  67         protected $mTimestamp = '';
  68
  69         /**
  70          * @var string
  71          */
  72         protected $mTouched = '19700101000000';
  73
  74         /**
  75          * @var int|null
  76          */
  77         protected $mCounter = null;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param $title Title Reference to a Title object.
  82          */
  83         public function __construct( Title $title ) {
  84                 $this->mTitle = $title;
  85         }
  86
  87         /**
  88          * Create a WikiPage object of the appropriate class for the given title.
  89          *
  90          * @param $title Title
  91          * @return WikiPage object of the appropriate type
  92          */
  93         public static function factory( Title $title ) {
  94                 $ns = $title->getNamespace();
  95
  96                 if ( $ns == NS_MEDIA ) {
  97                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  98                 } elseif ( $ns < 0 ) {
  99                         throw new MWException( "Invalid or virtual namespace $ns given." );
 100                 }
 101
 102                 switch ( $ns ) {
 103                         case NS_FILE:
 104                                 $page = new WikiFilePage( $title );
 105                                 break;
 106                         case NS_CATEGORY:
 107                                 $page = new WikiCategoryPage( $title );
 108                                 break;
 109                         default:
 110                                 $page = new WikiPage( $title );
 111                 }
 112
 113                 return $page;
 114         }
 115
 116         /**
 117          * Constructor from a page id
 118          *
 119          * @param $id Int article ID to load
 120          *
 121          * @return WikiPage
 122          */
 123         public static function newFromID( $id ) {
 124                 $t = Title::newFromID( $id );
 125                 if ( $t ) {
 126                         return self::factory( $t );
 127                 }
 128                 return null;
 129         }
 130
 131         /**
 132          * Returns overrides for action handlers.
 133          * Classes listed here will be used instead of the default one when
 134          * (and only when) $wgActions[$action] === true. This allows subclasses
 135          * to override the default behavior.
 136          *
 137          * @todo: move this UI stuff somewhere else
 138          *
 139          * @return Array
 140          */
 141         public function getActionOverrides() {
 142                 return array();
 143         }
 144
 145         /**
 146          * Get the title object of the article
 147          * @return Title object of this page
 148          */
 149         public function getTitle() {
 150                 return $this->mTitle;
 151         }
 152
 153         /**
 154          * Clear the object
 155          */
 156         public function clear() {
 157                 $this->mDataLoaded = false;
 158
 159                 $this->mCounter = null;
 160                 $this->mRedirectTarget = null; # Title object if set
 161                 $this->mLastRevision = null; # Latest revision
 162                 $this->mTouched = '19700101000000';
 163                 $this->mTimestamp = '';
 164                 $this->mIsRedirect = false;
 165                 $this->mLatest = false;
 166                 $this->mPreparedEdit = false;
 167         }
 168
 169         /**
 170          * Return the list of revision fields that should be selected to create
 171          * a new page.
 172          *
 173          * @return array
 174          */
 175         public static function selectFields() {
 176                 return array(
 177                         'page_id',
 178                         'page_namespace',
 179                         'page_title',
 180                         'page_restrictions',
 181                         'page_counter',
 182                         'page_is_redirect',
 183                         'page_is_new',
 184                         'page_random',
 185                         'page_touched',
 186                         'page_latest',
 187                         'page_len',
 188                 );
 189         }
 190
 191         /**
 192          * Fetch a page record with the given conditions
 193          * @param $dbr DatabaseBase object
 194          * @param $conditions Array
 195          * @return mixed Database result resource, or false on failure
 196          */
 197         protected function pageData( $dbr, $conditions ) {
 198                 $fields = self::selectFields();
 199
 200                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 201
 202                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 203
 204                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 205
 206                 return $row;
 207         }
 208
 209         /**
 210          * Fetch a page record matching the Title object's namespace and title
 211          * using a sanitized title string
 212          *
 213          * @param $dbr DatabaseBase object
 214          * @param $title Title object
 215          * @return mixed Database result resource, or false on failure
 216          */
 217         public function pageDataFromTitle( $dbr, $title ) {
 218                 return $this->pageData( $dbr, array(
 219                         'page_namespace' => $title->getNamespace(),
 220                         'page_title'     => $title->getDBkey() ) );
 221         }
 222
 223         /**
 224          * Fetch a page record matching the requested ID
 225          *
 226          * @param $dbr DatabaseBase
 227          * @param $id Integer
 228          * @return mixed Database result resource, or false on failure
 229          */
 230         public function pageDataFromId( $dbr, $id ) {
 231                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 232         }
 233
 234         /**
 235          * Set the general counter, title etc data loaded from
 236          * some source.
 237          *
 238          * @param $data Object|String One of the following:
 239          *              A DB query result object or...
 240          *              "fromdb" to get from a slave DB or...
 241          *              "fromdbmaster" to get from the master DB
 242          * @return void
 243          */
 244         public function loadPageData( $data = 'fromdb' ) {
 245                 if ( $data === 'fromdbmaster' ) {
 246                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 247                 } elseif ( $data === 'fromdb' ) { // slave
 248                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 249                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 250                         # Note that DB also stores the master position in the session and checks it.
 251                         $touched = $this->getCachedLastEditTime();
 252                         if ( $touched ) { // key set
 253                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 254                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 255                                 }
 256                         }
 257                 }
 258
 259                 $lc = LinkCache::singleton();
 260
 261                 if ( $data ) {
 262                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 263
 264                         $this->mTitle->loadFromRow( $data );
 265
 266                         # Old-fashioned restrictions
 267                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 268
 269                         $this->mCounter     = intval( $data->page_counter );
 270                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 271                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 272                         $this->mLatest      = intval( $data->page_latest );
 273                 } else {
 274                         $lc->addBadLinkObj( $this->mTitle );
 275
 276                         $this->mTitle->loadFromRow( false );
 277                 }
 278
 279                 $this->mDataLoaded = true;
 280         }
 281
 282         /**
 283          * @return int Page ID
 284          */
 285         public function getId() {
 286                 return $this->mTitle->getArticleID();
 287         }
 288
 289         /**
 290          * @return bool Whether or not the page exists in the database
 291          */
 292         public function exists() {
 293                 return $this->mTitle->exists();
 294         }
 295
 296         /**
 297          * Check if this page is something we're going to be showing
 298          * some sort of sensible content for. If we return false, page
 299          * views (plain action=view) will return an HTTP 404 response,
 300          * so spiders and robots can know they're following a bad link.
 301          *
 302          * @return bool
 303          */
 304         public function hasViewableContent() {
 305                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 306         }
 307
 308         /**
 309          * @return int The view count for the page
 310          */
 311         public function getCount() {
 312                 if ( !$this->mDataLoaded ) {
 313                         $this->loadPageData();
 314                 }
 315
 316                 return $this->mCounter;
 317         }
 318
 319         /**
 320          * Tests if the article text represents a redirect
 321          *
 322          * @param $text mixed string containing article contents, or boolean
 323          * @return bool
 324          */
 325         public function isRedirect( $text = false ) {
 326                 if ( $text === false ) {
 327                         if ( !$this->mDataLoaded ) {
 328                                 $this->loadPageData();
 329                         }
 330
 331                         return (bool)$this->mIsRedirect;
 332                 } else {
 333                         return Title::newFromRedirect( $text ) !== null;
 334                 }
 335         }
 336
 337         /**
 338          * Loads page_touched and returns a value indicating if it should be used
 339          * @return boolean true if not a redirect
 340          */
 341         public function checkTouched() {
 342                 if ( !$this->mDataLoaded ) {
 343                         $this->loadPageData();
 344                 }
 345                 return !$this->mIsRedirect;
 346         }
 347
 348         /**
 349          * Get the page_touched field
 350          * @return string containing GMT timestamp
 351          */
 352         public function getTouched() {
 353                 if ( !$this->mDataLoaded ) {
 354                         $this->loadPageData();
 355                 }
 356                 return $this->mTouched;
 357         }
 358
 359         /**
 360          * Get the page_latest field
 361          * @return integer rev_id of current revision
 362          */
 363         public function getLatest() {
 364                 if ( !$this->mDataLoaded ) {
 365                         $this->loadPageData();
 366                 }
 367                 return (int)$this->mLatest;
 368         }
 369
 370         /**
 371          * Loads everything except the text
 372          * This isn't necessary for all uses, so it's only done if needed.
 373          */
 374         protected function loadLastEdit() {
 375                 if ( $this->mLastRevision !== null ) {
 376                         return; // already loaded
 377                 }
 378
 379                 $latest = $this->getLatest();
 380                 if ( !$latest ) {
 381                         return; // page doesn't exist or is missing page_latest info
 382                 }
 383
 384                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 385                 if ( $revision ) { // sanity
 386                         $this->setLastEdit( $revision );
 387                 }
 388         }
 389
 390         /**
 391          * Set the latest revision
 392          */
 393         protected function setLastEdit( Revision $revision ) {
 394                 $this->mLastRevision = $revision;
 395                 $this->mTimestamp = $revision->getTimestamp();
 396         }
 397
 398         /**
 399          * Get the latest revision
 400          * @return Revision|null
 401          */
 402         public function getRevision() {
 403                 $this->loadLastEdit();
 404                 if ( $this->mLastRevision ) {
 405                         return $this->mLastRevision;
 406                 }
 407                 return null;
 408         }
 409
 410         /**
 411          * Get the text of the current revision. No side-effects...
 412          *
 413          * @param $audience Integer: one of:
 414          *      Revision::FOR_PUBLIC       to be displayed to all users
 415          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 416          *      Revision::RAW              get the text regardless of permissions
 417          * @return String|bool The text of the current revision. False on failure
 418          */
 419         public function getText( $audience = Revision::FOR_PUBLIC ) {
 420                 $this->loadLastEdit();
 421                 if ( $this->mLastRevision ) {
 422                         return $this->mLastRevision->getText( $audience );
 423                 }
 424                 return false;
 425         }
 426
 427         /**
 428          * Get the text of the current revision. No side-effects...
 429          *
 430          * @return String|bool The text of the current revision. False on failure
 431          */
 432         public function getRawText() {
 433                 $this->loadLastEdit();
 434                 if ( $this->mLastRevision ) {
 435                         return $this->mLastRevision->getRawText();
 436                 }
 437                 return false;
 438         }
 439
 440         /**
 441          * @return string MW timestamp of last article revision
 442          */
 443         public function getTimestamp() {
 444                 // Check if the field has been filled by WikiPage::setTimestamp()
 445                 if ( !$this->mTimestamp ) {
 446                         $this->loadLastEdit();
 447                 }
 448                 return wfTimestamp( TS_MW, $this->mTimestamp );
 449         }
 450
 451         /**
 452          * Set the page timestamp (use only to avoid DB queries)
 453          * @param $ts string MW timestamp of last article revision
 454          * @return void
 455          */
 456         public function setTimestamp( $ts ) {
 457                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 458         }
 459
 460         /**
 461          * @param $audience Integer: one of:
 462          *      Revision::FOR_PUBLIC       to be displayed to all users
 463          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 464          *      Revision::RAW              get the text regardless of permissions
 465          * @return int user ID for the user that made the last article revision
 466          */
 467         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 468                 $this->loadLastEdit();
 469                 if ( $this->mLastRevision ) {
 470                         return $this->mLastRevision->getUser( $audience );
 471                 } else {
 472                         return -1;
 473                 }
 474         }
 475
 476         /**
 477          * @param $audience Integer: one of:
 478          *      Revision::FOR_PUBLIC       to be displayed to all users
 479          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 480          *      Revision::RAW              get the text regardless of permissions
 481          * @return string username of the user that made the last article revision
 482          */
 483         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 484                 $this->loadLastEdit();
 485                 if ( $this->mLastRevision ) {
 486                         return $this->mLastRevision->getUserText( $audience );
 487                 } else {
 488                         return '';
 489                 }
 490         }
 491
 492         /**
 493          * @param $audience Integer: one of:
 494          *      Revision::FOR_PUBLIC       to be displayed to all users
 495          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 496          *      Revision::RAW              get the text regardless of permissions
 497          * @return string Comment stored for the last article revision
 498          */
 499         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 500                 $this->loadLastEdit();
 501                 if ( $this->mLastRevision ) {
 502                         return $this->mLastRevision->getComment( $audience );
 503                 } else {
 504                         return '';
 505                 }
 506         }
 507
 508         /**
 509          * Returns true if last revision was marked as "minor edit"
 510          *
 511          * @return boolean Minor edit indicator for the last article revision.
 512          */
 513         public function getMinorEdit() {
 514                 $this->loadLastEdit();
 515                 if ( $this->mLastRevision ) {
 516                         return $this->mLastRevision->isMinor();
 517                 } else {
 518                         return false;
 519                 }
 520         }
 521
 522         /**
 523          * Get the cached timestamp for the last time the page changed.
 524          * This is only used to help handle slave lag by comparing to page_touched.
 525          * @return string MW timestamp
 526          */
 527         protected function getCachedLastEditTime() {
 528                 global $wgMemc;
 529                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 530                 return $wgMemc->get( $key );
 531         }
 532
 533         /**
 534          * Set the cached timestamp for the last time the page changed.
 535          * This is only used to help handle slave lag by comparing to page_touched.
 536          * @param $timestamp string
 537          * @return void
 538          */
 539         public function setCachedLastEditTime( $timestamp ) {
 540                 global $wgMemc;
 541                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 542                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 543         }
 544
 545         /**
 546          * Determine whether a page would be suitable for being counted as an
 547          * article in the site_stats table based on the title & its content
 548          *
 549          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 550          *        if false, the current database state will be used
 551          * @return Boolean
 552          */
 553         public function isCountable( $editInfo = false ) {
 554                 global $wgArticleCountMethod;
 555
 556                 if ( !$this->mTitle->isContentPage() ) {
 557                         return false;
 558                 }
 559
 560                 $text = $editInfo ? $editInfo->pst : false;
 561
 562                 if ( $this->isRedirect( $text ) ) {
 563                         return false;
 564                 }
 565
 566                 switch ( $wgArticleCountMethod ) {
 567                 case 'any':
 568                         return true;
 569                 case 'comma':
 570                         if ( $text === false ) {
 571                                 $text = $this->getRawText();
 572                         }
 573                         return strpos( $text,  ',' ) !== false;
 574                 case 'link':
 575                         if ( $editInfo ) {
 576                                 // ParserOutput::getLinks() is a 2D array of page links, so
 577                                 // to be really correct we would need to recurse in the array
 578                                 // but the main array should only have items in it if there are
 579                                 // links.
 580                                 return (bool)count( $editInfo->output->getLinks() );
 581                         } else {
 582                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 583                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 584                         }
 585                 }
 586         }
 587
 588         /**
 589          * If this page is a redirect, get its target
 590          *
 591          * The target will be fetched from the redirect table if possible.
 592          * If this page doesn't have an entry there, call insertRedirect()
 593          * @return Title|mixed object, or null if this page is not a redirect
 594          */
 595         public function getRedirectTarget() {
 596                 if ( !$this->mTitle->isRedirect() ) {
 597                         return null;
 598                 }
 599
 600                 if ( $this->mRedirectTarget !== null ) {
 601                         return $this->mRedirectTarget;
 602                 }
 603
 604                 # Query the redirect table
 605                 $dbr = wfGetDB( DB_SLAVE );
 606                 $row = $dbr->selectRow( 'redirect',
 607                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 608                         array( 'rd_from' => $this->getId() ),
 609                         __METHOD__
 610                 );
 611
 612                 // rd_fragment and rd_interwiki were added later, populate them if empty
 613                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 614                         return $this->mRedirectTarget = Title::makeTitle(
 615                                 $row->rd_namespace, $row->rd_title,
 616                                 $row->rd_fragment, $row->rd_interwiki );
 617                 }
 618
 619                 # This page doesn't have an entry in the redirect table
 620                 return $this->mRedirectTarget = $this->insertRedirect();
 621         }
 622
 623         /**
 624          * Insert an entry for this page into the redirect table.
 625          *
 626          * Don't call this function directly unless you know what you're doing.
 627          * @return Title object or null if not a redirect
 628          */
 629         public function insertRedirect() {
 630                 // recurse through to only get the final target
 631                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 632                 if ( !$retval ) {
 633                         return null;
 634                 }
 635                 $this->insertRedirectEntry( $retval );
 636                 return $retval;
 637         }
 638
 639         /**
 640          * Insert or update the redirect table entry for this page to indicate
 641          * it redirects to $rt .
 642          * @param $rt Title redirect target
 643          */
 644         public function insertRedirectEntry( $rt ) {
 645                 $dbw = wfGetDB( DB_MASTER );
 646                 $dbw->replace( 'redirect', array( 'rd_from' ),
 647                         array(
 648                                 'rd_from'      => $this->getId(),
 649                                 'rd_namespace' => $rt->getNamespace(),
 650                                 'rd_title'     => $rt->getDBkey(),
 651                                 'rd_fragment'  => $rt->getFragment(),
 652                                 'rd_interwiki' => $rt->getInterwiki(),
 653                         ),
 654                         __METHOD__
 655                 );
 656         }
 657
 658         /**
 659          * Get the Title object or URL this page redirects to
 660          *
 661          * @return mixed false, Title of in-wiki target, or string with URL
 662          */
 663         public function followRedirect() {
 664                 return $this->getRedirectURL( $this->getRedirectTarget() );
 665         }
 666
 667         /**
 668          * Get the Title object or URL to use for a redirect. We use Title
 669          * objects for same-wiki, non-special redirects and URLs for everything
 670          * else.
 671          * @param $rt Title Redirect target
 672          * @return mixed false, Title object of local target, or string with URL
 673          */
 674         public function getRedirectURL( $rt ) {
 675                 if ( !$rt ) {
 676                         return false;
 677                 }
 678
 679                 if ( $rt->isExternal() ) {
 680                         if ( $rt->isLocal() ) {
 681                                 // Offsite wikis need an HTTP redirect.
 682                                 //
 683                                 // This can be hard to reverse and may produce loops,
 684                                 // so they may be disabled in the site configuration.
 685                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 686                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 687                         } else {
 688                                 // External pages pages without "local" bit set are not valid
 689                                 // redirect targets
 690                                 return false;
 691                         }
 692                 }
 693
 694                 if ( $rt->isSpecialPage() ) {
 695                         // Gotta handle redirects to special pages differently:
 696                         // Fill the HTTP response "Location" header and ignore
 697                         // the rest of the page we're on.
 698                         //
 699                         // Some pages are not valid targets
 700                         if ( $rt->isValidRedirectTarget() ) {
 701                                 return $rt->getFullURL();
 702                         } else {
 703                                 return false;
 704                         }
 705                 }
 706
 707                 return $rt;
 708         }
 709
 710         /**
 711          * Get a list of users who have edited this article, not including the user who made
 712          * the most recent revision, which you can get from $article->getUser() if you want it
 713          * @return UserArrayFromResult
 714          */
 715         public function getContributors() {
 716                 # @todo FIXME: This is expensive; cache this info somewhere.
 717
 718                 $dbr = wfGetDB( DB_SLAVE );
 719
 720                 if ( $dbr->implicitGroupby() ) {
 721                         $realNameField = 'user_real_name';
 722                 } else {
 723                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 724                 }
 725
 726                 $tables = array( 'revision', 'user' );
 727
 728                 $fields = array(
 729                         'rev_user as user_id',
 730                         'rev_user_text AS user_name',
 731                         $realNameField,
 732                         'MAX(rev_timestamp) AS timestamp',
 733                 );
 734
 735                 $conds = array( 'rev_page' => $this->getId() );
 736
 737                 // The user who made the top revision gets credited as "this page was last edited by
 738                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 739                 $user = $this->getUser();
 740                 if ( $user ) {
 741                         $conds[] = "rev_user != $user";
 742                 } else {
 743                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 744                 }
 745
 746                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 747
 748                 $jconds = array(
 749                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 750                 );
 751
 752                 $options = array(
 753                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 754                         'ORDER BY' => 'timestamp DESC',
 755                 );
 756
 757                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 758                 return new UserArrayFromResult( $res );
 759         }
 760
 761         /**
 762          * Get the last N authors
 763          * @param $num Integer: number of revisions to get
 764          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 765          * @return array Array of authors, duplicates not removed
 766          */
 767         public function getLastNAuthors( $num, $revLatest = 0 ) {
 768                 wfProfileIn( __METHOD__ );
 769                 // First try the slave
 770                 // If that doesn't have the latest revision, try the master
 771                 $continue = 2;
 772                 $db = wfGetDB( DB_SLAVE );
 773
 774                 do {
 775                         $res = $db->select( array( 'page', 'revision' ),
 776                                 array( 'rev_id', 'rev_user_text' ),
 777                                 array(
 778                                         'page_namespace' => $this->mTitle->getNamespace(),
 779                                         'page_title' => $this->mTitle->getDBkey(),
 780                                         'rev_page = page_id'
 781                                 ), __METHOD__,
 782                                 array(
 783                                         'ORDER BY' => 'rev_timestamp DESC',
 784                                         'LIMIT' => $num
 785                                 )
 786                         );
 787
 788                         if ( !$res ) {
 789                                 wfProfileOut( __METHOD__ );
 790                                 return array();
 791                         }
 792
 793                         $row = $db->fetchObject( $res );
 794
 795                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 796                                 $db = wfGetDB( DB_MASTER );
 797                                 $continue--;
 798                         } else {
 799                                 $continue = 0;
 800                         }
 801                 } while ( $continue );
 802
 803                 $authors = array( $row->rev_user_text );
 804
 805                 foreach ( $res as $row ) {
 806                         $authors[] = $row->rev_user_text;
 807                 }
 808
 809                 wfProfileOut( __METHOD__ );
 810                 return $authors;
 811         }
 812
 813         /**
 814          * Should the parser cache be used?
 815          *
 816          * @param $parserOptions ParserOptions to check
 817          * @param $oldid int
 818          * @return boolean
 819          */
 820         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 821                 global $wgEnableParserCache;
 822
 823                 return $wgEnableParserCache
 824                         && $parserOptions->getStubThreshold() == 0
 825                         && $this->mTitle->exists()
 826                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 827                         && $this->mTitle->isWikitextPage();
 828         }
 829
 830         /**
 831          * Get a ParserOutput for the given ParserOptions and revision ID.
 832          * The parser cache will be used if possible.
 833          *
 834          * @since 1.19
 835          * @param $parserOptions ParserOptions to use for the parse operation
 836          * @param $oldid Revision ID to get the text from, passing null or 0 will
 837          *               get the current revision (default value)
 838          * @return ParserOutput or false if the revision was not found
 839          */
 840         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 841                 wfProfileIn( __METHOD__ );
 842
 843                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 844                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 845                 if ( $parserOptions->getStubThreshold() ) {
 846                         wfIncrStats( 'pcache_miss_stub' );
 847                 }
 848
 849                 if ( $useParserCache ) {
 850                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 851                         if ( $parserOutput !== false ) {
 852                                 wfProfileOut( __METHOD__ );
 853                                 return $parserOutput;
 854                         }
 855                 }
 856
 857                 if ( $oldid === null || $oldid === 0 ) {
 858                         $oldid = $this->getLatest();
 859                 }
 860
 861                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 862                 $pool->execute();
 863
 864                 wfProfileOut( __METHOD__ );
 865
 866                 return $pool->getParserOutput();
 867         }
 868
 869         /**
 870          * Do standard deferred updates after page view
 871          * @param $user User The relevant user
 872          */
 873         public function doViewUpdates( User $user ) {
 874                 global $wgDisableCounters;
 875                 if ( wfReadOnly() ) {
 876                         return;
 877                 }
 878
 879                 # Don't update page view counters on views from bot users (bug 14044)
 880                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 881                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 882                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 883                 }
 884
 885                 # Update newtalk / watchlist notification status
 886                 $user->clearNotification( $this->mTitle );
 887         }
 888
 889         /**
 890          * Perform the actions of a page purging
 891          * @return bool
 892          */
 893         public function doPurge() {
 894                 global $wgUseSquid;
 895
 896                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 897                         return false;
 898                 }
 899
 900                 // Invalidate the cache
 901                 $this->mTitle->invalidateCache();
 902                 $this->clear();
 903
 904                 if ( $wgUseSquid ) {
 905                         // Commit the transaction before the purge is sent
 906                         $dbw = wfGetDB( DB_MASTER );
 907                         $dbw->commit();
 908
 909                         // Send purge
 910                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 911                         $update->doUpdate();
 912                 }
 913
 914                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 915                         if ( $this->mTitle->exists() ) {
 916                                 $text = $this->getRawText();
 917                         } else {
 918                                 $text = false;
 919                         }
 920
 921                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 922                 }
 923                 return true;
 924         }
 925
 926         /**
 927          * Insert a new empty page record for this article.
 928          * This *must* be followed up by creating a revision
 929          * and running $this->updateRevisionOn( ... );
 930          * or else the record will be left in a funky state.
 931          * Best if all done inside a transaction.
 932          *
 933          * @param $dbw DatabaseBase
 934          * @return int The newly created page_id key, or false if the title already existed
 935          */
 936         public function insertOn( $dbw ) {
 937                 wfProfileIn( __METHOD__ );
 938
 939                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 940                 $dbw->insert( 'page', array(
 941                         'page_id'           => $page_id,
 942                         'page_namespace'    => $this->mTitle->getNamespace(),
 943                         'page_title'        => $this->mTitle->getDBkey(),
 944                         'page_counter'      => 0,
 945                         'page_restrictions' => '',
 946                         'page_is_redirect'  => 0, # Will set this shortly...
 947                         'page_is_new'       => 1,
 948                         'page_random'       => wfRandom(),
 949                         'page_touched'      => $dbw->timestamp(),
 950                         'page_latest'       => 0, # Fill this in shortly...
 951                         'page_len'          => 0, # Fill this in shortly...
 952                 ), __METHOD__, 'IGNORE' );
 953
 954                 $affected = $dbw->affectedRows();
 955
 956                 if ( $affected ) {
 957                         $newid = $dbw->insertId();
 958                         $this->mTitle->resetArticleID( $newid );
 959                 }
 960                 wfProfileOut( __METHOD__ );
 961
 962                 return $affected ? $newid : false;
 963         }
 964
 965         /**
 966          * Update the page record to point to a newly saved revision.
 967          *
 968          * @param $dbw DatabaseBase: object
 969          * @param $revision Revision: For ID number, and text used to set
 970          *                  length and redirect status fields
 971          * @param $lastRevision Integer: if given, will not overwrite the page field
 972          *                      when different from the currently set value.
 973          *                      Giving 0 indicates the new page flag should be set
 974          *                      on.
 975          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 976          *                           removing rows in redirect table.
 977          * @return bool true on success, false on failure
 978          * @private
 979          */
 980         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 981                 wfProfileIn( __METHOD__ );
 982
 983                 $text = $revision->getText();
 984                 $len = strlen( $text );
 985                 $rt = Title::newFromRedirectRecurse( $text );
 986
 987                 $conditions = array( 'page_id' => $this->getId() );
 988
 989                 if ( !is_null( $lastRevision ) ) {
 990                         # An extra check against threads stepping on each other
 991                         $conditions['page_latest'] = $lastRevision;
 992                 }
 993
 994                 $now = wfTimestampNow();
 995                 $dbw->update( 'page',
 996                         array( /* SET */
 997                                 'page_latest'      => $revision->getId(),
 998                                 'page_touched'     => $dbw->timestamp( $now ),
 999                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1000                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1001                                 'page_len'         => $len,
1002                         ),
1003                         $conditions,
1004                         __METHOD__ );
1005
1006                 $result = $dbw->affectedRows() != 0;
1007                 if ( $result ) {
1008                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1009                         $this->setLastEdit( $revision );
1010                         $this->setCachedLastEditTime( $now );
1011                         $this->mLatest = $revision->getId();
1012                         $this->mIsRedirect = (bool)$rt;
1013                         # Update the LinkCache.
1014                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1015                 }
1016
1017                 wfProfileOut( __METHOD__ );
1018                 return $result;
1019         }
1020
1021         /**
1022          * Add row to the redirect table if this is a redirect, remove otherwise.
1023          *
1024          * @param $dbw DatabaseBase
1025          * @param $redirectTitle Title object pointing to the redirect target,
1026          *                       or NULL if this is not a redirect
1027          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1028          *                           removing rows in redirect table.
1029          * @return bool true on success, false on failure
1030          * @private
1031          */
1032         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1033                 // Always update redirects (target link might have changed)
1034                 // Update/Insert if we don't know if the last revision was a redirect or not
1035                 // Delete if changing from redirect to non-redirect
1036                 $isRedirect = !is_null( $redirectTitle );
1037
1038                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1039                         return true;
1040                 }
1041
1042                 wfProfileIn( __METHOD__ );
1043                 if ( $isRedirect ) {
1044                         $this->insertRedirectEntry( $redirectTitle );
1045                 } else {
1046                         // This is not a redirect, remove row from redirect table
1047                         $where = array( 'rd_from' => $this->getId() );
1048                         $dbw->delete( 'redirect', $where, __METHOD__ );
1049                 }
1050
1051                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1052                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1053                 }
1054                 wfProfileOut( __METHOD__ );
1055
1056                 return ( $dbw->affectedRows() != 0 );
1057         }
1058
1059         /**
1060          * If the given revision is newer than the currently set page_latest,
1061          * update the page record. Otherwise, do nothing.
1062          *
1063          * @param $dbw DatabaseBase object
1064          * @param $revision Revision object
1065          * @return mixed
1066          */
1067         public function updateIfNewerOn( $dbw, $revision ) {
1068                 wfProfileIn( __METHOD__ );
1069
1070                 $row = $dbw->selectRow(
1071                         array( 'revision', 'page' ),
1072                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1073                         array(
1074                                 'page_id' => $this->getId(),
1075                                 'page_latest=rev_id' ),
1076                         __METHOD__ );
1077
1078                 if ( $row ) {
1079                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1080                                 wfProfileOut( __METHOD__ );
1081                                 return false;
1082                         }
1083                         $prev = $row->rev_id;
1084                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1085                 } else {
1086                         # No or missing previous revision; mark the page as new
1087                         $prev = 0;
1088                         $lastRevIsRedirect = null;
1089                 }
1090
1091                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1092
1093                 wfProfileOut( __METHOD__ );
1094                 return $ret;
1095         }
1096
1097         /**
1098          * Get the text that needs to be saved in order to undo all revisions
1099          * between $undo and $undoafter. Revisions must belong to the same page,
1100          * must exist and must not be deleted
1101          * @param $undo Revision
1102          * @param $undoafter Revision Must be an earlier revision than $undo
1103          * @return mixed string on success, false on failure
1104          */
1105         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1106                 $cur_text = $this->getRawText();
1107                 if ( $cur_text === false ) {
1108                         return false; // no page
1109                 }
1110                 $undo_text = $undo->getText();
1111                 $undoafter_text = $undoafter->getText();
1112
1113                 if ( $cur_text == $undo_text ) {
1114                         # No use doing a merge if it's just a straight revert.
1115                         return $undoafter_text;
1116                 }
1117
1118                 $undone_text = '';
1119
1120                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
1121                         return false;
1122                 }
1123
1124                 return $undone_text;
1125         }
1126
1127         /**
1128          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1129          * @param $text String: new text of the section
1130          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1131          * @param $edittime String: revision timestamp or null to use the current revision
1132          * @return string Complete article text, or null if error
1133          */
1134         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1135                 wfProfileIn( __METHOD__ );
1136
1137                 if ( strval( $section ) == '' ) {
1138                         // Whole-page edit; let the whole text through
1139                 } else {
1140                         // Bug 30711: always use current version when adding a new section
1141                         if ( is_null( $edittime ) || $section == 'new' ) {
1142                                 $oldtext = $this->getRawText();
1143                                 if ( $oldtext === false ) {
1144                                         wfDebug( __METHOD__ . ": no page text\n" );
1145                                         wfProfileOut( __METHOD__ );
1146                                         return null;
1147                                 }
1148                         } else {
1149                                 $dbw = wfGetDB( DB_MASTER );
1150                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1151
1152                                 if ( !$rev ) {
1153                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1154                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1155                                         wfProfileOut( __METHOD__ );
1156                                         return null;
1157                                 }
1158
1159                                 $oldtext = $rev->getText();
1160                         }
1161
1162                         if ( $section == 'new' ) {
1163                                 # Inserting a new section
1164                                 $subject = $sectionTitle ? wfMsgForContent( 'newsectionheaderdefaultlevel', $sectionTitle ) . "\n\n" : '';
1165                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
1166                                         $text = strlen( trim( $oldtext ) ) > 0
1167                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1168                                                 : "{$subject}{$text}";
1169                                 }
1170                         } else {
1171                                 # Replacing an existing section; roll out the big guns
1172                                 global $wgParser;
1173
1174                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1175                         }
1176                 }
1177
1178                 wfProfileOut( __METHOD__ );
1179                 return $text;
1180         }
1181
1182         /**
1183          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1184          * @param $flags Int
1185          * @return Int updated $flags
1186          */
1187         function checkFlags( $flags ) {
1188                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1189                         if ( $this->mTitle->getArticleID() ) {
1190                                 $flags |= EDIT_UPDATE;
1191                         } else {
1192                                 $flags |= EDIT_NEW;
1193                         }
1194                 }
1195
1196                 return $flags;
1197         }
1198
1199         /**
1200          * Change an existing article or create a new article. Updates RC and all necessary caches,
1201          * optionally via the deferred update array.
1202          *
1203          * @param $text String: new text
1204          * @param $summary String: edit summary
1205          * @param $flags Integer bitfield:
1206          *      EDIT_NEW
1207          *          Article is known or assumed to be non-existent, create a new one
1208          *      EDIT_UPDATE
1209          *          Article is known or assumed to be pre-existing, update it
1210          *      EDIT_MINOR
1211          *          Mark this edit minor, if the user is allowed to do so
1212          *      EDIT_SUPPRESS_RC
1213          *          Do not log the change in recentchanges
1214          *      EDIT_FORCE_BOT
1215          *          Mark the edit a "bot" edit regardless of user rights
1216          *      EDIT_DEFER_UPDATES
1217          *          Defer some of the updates until the end of index.php
1218          *      EDIT_AUTOSUMMARY
1219          *          Fill in blank summaries with generated text where possible
1220          *
1221          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1222          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1223          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1224          * edit-already-exists error will be returned. These two conditions are also possible with
1225          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1226          *
1227          * @param $baseRevId int the revision ID this edit was based off, if any
1228          * @param $user User the user doing the edit
1229          *
1230          * @return Status object. Possible errors:
1231          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1232          *     edit-gone-missing:       In update mode, but the article didn't exist
1233          *     edit-conflict:           In update mode, the article changed unexpectedly
1234          *     edit-no-change:          Warning that the text was the same as before
1235          *     edit-already-exists:     In creation mode, but the article already exists
1236          *
1237          *  Extensions may define additional errors.
1238          *
1239          *  $return->value will contain an associative array with members as follows:
1240          *     new:                     Boolean indicating if the function attempted to create a new article
1241          *     revision:                The revision object for the inserted revision, or null
1242          *
1243          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1244          */
1245         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1246                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1247
1248                 # Low-level sanity check
1249                 if ( $this->mTitle->getText() === '' ) {
1250                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1251                 }
1252
1253                 wfProfileIn( __METHOD__ );
1254
1255                 $user = is_null( $user ) ? $wgUser : $user;
1256                 $status = Status::newGood( array() );
1257
1258                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1259                 $this->loadPageData( 'fromdbmaster' );
1260
1261                 $flags = $this->checkFlags( $flags );
1262
1263                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1264                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1265                 {
1266                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1267
1268                         if ( $status->isOK() ) {
1269                                 $status->fatal( 'edit-hook-aborted' );
1270                         }
1271
1272                         wfProfileOut( __METHOD__ );
1273                         return $status;
1274                 }
1275
1276                 # Silently ignore EDIT_MINOR if not allowed
1277                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1278                 $bot = $flags & EDIT_FORCE_BOT;
1279
1280                 $oldtext = $this->getRawText(); // current revision
1281                 $oldsize = strlen( $oldtext );
1282                 $oldid = $this->getLatest();
1283                 $oldIsRedirect = $this->isRedirect();
1284                 $oldcountable = $this->isCountable();
1285
1286                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1287                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1288                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1289                 }
1290
1291                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1292                 $text = $editInfo->pst;
1293                 $newsize = strlen( $text );
1294
1295                 $dbw = wfGetDB( DB_MASTER );
1296                 $now = wfTimestampNow();
1297                 $this->mTimestamp = $now;
1298
1299                 if ( $flags & EDIT_UPDATE ) {
1300                         # Update article, but only if changed.
1301                         $status->value['new'] = false;
1302
1303                         if ( !$oldid ) {
1304                                 # Article gone missing
1305                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1306                                 $status->fatal( 'edit-gone-missing' );
1307
1308                                 wfProfileOut( __METHOD__ );
1309                                 return $status;
1310                         }
1311
1312                         # Make sure the revision is either completely inserted or not inserted at all
1313                         if ( !$wgDBtransactions ) {
1314                                 $userAbort = ignore_user_abort( true );
1315                         }
1316
1317                         $revision = new Revision( array(
1318                                 'page'       => $this->getId(),
1319                                 'comment'    => $summary,
1320                                 'minor_edit' => $isminor,
1321                                 'text'       => $text,
1322                                 'parent_id'  => $oldid,
1323                                 'user'       => $user->getId(),
1324                                 'user_text'  => $user->getName(),
1325                                 'timestamp'  => $now
1326                         ) );
1327
1328                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1329
1330                         if ( $changed ) {
1331                                 $dbw->begin();
1332                                 $revisionId = $revision->insertOn( $dbw );
1333
1334                                 # Update page
1335                                 #
1336                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1337                                 # during the course of this function. This makes sure that EditPage can detect
1338                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1339                                 # before this function is called. A previous function used a separate query, this
1340                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1341                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1342
1343                                 if ( !$ok ) {
1344                                         /* Belated edit conflict! Run away!! */
1345                                         $status->fatal( 'edit-conflict' );
1346
1347                                         # Delete the invalid revision if the DB is not transactional
1348                                         if ( !$wgDBtransactions ) {
1349                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1350                                         }
1351
1352                                         $revisionId = 0;
1353                                         $dbw->rollback();
1354                                 } else {
1355                                         global $wgUseRCPatrol;
1356                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1357                                         # Update recentchanges
1358                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1359                                                 # Mark as patrolled if the user can do so
1360                                                 $patrolled = $wgUseRCPatrol && !count(
1361                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1362                                                 # Add RC row to the DB
1363                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1364                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1365                                                         $revisionId, $patrolled
1366                                                 );
1367
1368                                                 # Log auto-patrolled edits
1369                                                 if ( $patrolled ) {
1370                                                         PatrolLog::record( $rc, true );
1371                                                 }
1372                                         }
1373                                         $user->incEditCount();
1374                                         $dbw->commit();
1375                                 }
1376                         } else {
1377                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1378                                 // related variables correctly
1379                                 $revision->setId( $this->getLatest() );
1380                         }
1381
1382                         if ( !$wgDBtransactions ) {
1383                                 ignore_user_abort( $userAbort );
1384                         }
1385
1386                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1387                         if ( !$status->isOK() ) {
1388                                 wfProfileOut( __METHOD__ );
1389                                 return $status;
1390                         }
1391
1392                         # Update links tables, site stats, etc.
1393                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1394                                 'oldcountable' => $oldcountable ) );
1395
1396                         if ( !$changed ) {
1397                                 $status->warning( 'edit-no-change' );
1398                                 $revision = null;
1399                                 // Update page_touched, this is usually implicit in the page update
1400                                 // Other cache updates are done in onArticleEdit()
1401                                 $this->mTitle->invalidateCache();
1402                         }
1403                 } else {
1404                         # Create new article
1405                         $status->value['new'] = true;
1406
1407                         $dbw->begin();
1408
1409                         # Add the page record; stake our claim on this title!
1410                         # This will return false if the article already exists
1411                         $newid = $this->insertOn( $dbw );
1412
1413                         if ( $newid === false ) {
1414                                 $dbw->rollback();
1415                                 $status->fatal( 'edit-already-exists' );
1416
1417                                 wfProfileOut( __METHOD__ );
1418                                 return $status;
1419                         }
1420
1421                         # Save the revision text...
1422                         $revision = new Revision( array(
1423                                 'page'       => $newid,
1424                                 'comment'    => $summary,
1425                                 'minor_edit' => $isminor,
1426                                 'text'       => $text,
1427                                 'user'       => $user->getId(),
1428                                 'user_text'  => $user->getName(),
1429                                 'timestamp'  => $now
1430                         ) );
1431                         $revisionId = $revision->insertOn( $dbw );
1432
1433                         # Update the page record with revision data
1434                         $this->updateRevisionOn( $dbw, $revision, 0 );
1435
1436                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1437
1438                         # Update recentchanges
1439                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1440                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1441
1442                                 # Mark as patrolled if the user can do so
1443                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1444                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1445                                 # Add RC row to the DB
1446                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1447                                         '', strlen( $text ), $revisionId, $patrolled );
1448
1449                                 # Log auto-patrolled edits
1450                                 if ( $patrolled ) {
1451                                         PatrolLog::record( $rc, true );
1452                                 }
1453                         }
1454                         $user->incEditCount();
1455                         $dbw->commit();
1456
1457                         # Update links, etc.
1458                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1459
1460                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1461                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1462                 }
1463
1464                 # Do updates right now unless deferral was requested
1465                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1466                         DeferredUpdates::doUpdates();
1467                 }
1468
1469                 // Return the new revision (or null) to the caller
1470                 $status->value['revision'] = $revision;
1471
1472                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1473                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1474
1475                 # Promote user to any groups they meet the criteria for
1476                 $user->addAutopromoteOnceGroups( 'onEdit' );
1477
1478                 wfProfileOut( __METHOD__ );
1479                 return $status;
1480         }
1481
1482         /**
1483          * Get parser options suitable for rendering the primary article wikitext
1484          * @param User|string $user User object or 'canonical'
1485          * @return ParserOptions
1486          */
1487         public function makeParserOptions( $user ) {
1488                 global $wgContLang;
1489                 if ( $user instanceof User ) { // settings per user (even anons)
1490                         $options = ParserOptions::newFromUser( $user );
1491                 } else { // canonical settings
1492                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1493                 }
1494                 $options->enableLimitReport(); // show inclusion/loop reports
1495                 $options->setTidy( true ); // fix bad HTML
1496                 return $options;
1497         }
1498
1499         /**
1500          * Prepare text which is about to be saved.
1501          * Returns a stdclass with source, pst and output members
1502          * @return bool|object
1503          */
1504         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1505                 global $wgParser, $wgContLang, $wgUser;
1506                 $user = is_null( $user ) ? $wgUser : $user;
1507                 // @TODO fixme: check $user->getId() here???
1508                 if ( $this->mPreparedEdit
1509                         && $this->mPreparedEdit->newText == $text
1510                         && $this->mPreparedEdit->revid == $revid
1511                 ) {
1512                         // Already prepared
1513                         return $this->mPreparedEdit;
1514                 }
1515
1516                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1517                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1518
1519                 $edit = (object)array();
1520                 $edit->revid = $revid;
1521                 $edit->newText = $text;
1522                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
1523                 $edit->popts = $this->makeParserOptions( 'canonical' );
1524                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1525                 $edit->oldText = $this->getRawText();
1526
1527                 $this->mPreparedEdit = $edit;
1528
1529                 return $edit;
1530         }
1531
1532         /**
1533          * Do standard deferred updates after page edit.
1534          * Update links tables, site stats, search index and message cache.
1535          * Purges pages that include this page if the text was changed here.
1536          * Every 100th edit, prune the recent changes table.
1537          *
1538          * @private
1539          * @param $revision Revision object
1540          * @param $user User object that did the revision
1541          * @param $options Array of options, following indexes are used:
1542          * - changed: boolean, whether the revision changed the content (default true)
1543          * - created: boolean, whether the revision created the page (default false)
1544          * - oldcountable: boolean or null (default null):
1545          *   - boolean: whether the page was counted as an article before that
1546          *     revision, only used in changed is true and created is false
1547          *   - null: don't change the article count
1548          */
1549         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1550                 global $wgEnableParserCache;
1551
1552                 wfProfileIn( __METHOD__ );
1553
1554                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1555                 $text = $revision->getText();
1556
1557                 # Parse the text
1558                 # Be careful not to double-PST: $text is usually already PST-ed once
1559                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1560                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1561                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1562                 } else {
1563                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1564                         $editInfo = $this->mPreparedEdit;
1565                 }
1566
1567                 # Save it to the parser cache
1568                 if ( $wgEnableParserCache ) {
1569                         $parserCache = ParserCache::singleton();
1570                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1571                 }
1572
1573                 # Update the links tables
1574                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1575                 $u->doUpdate();
1576
1577                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1578
1579                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1580                         if ( 0 == mt_rand( 0, 99 ) ) {
1581                                 // Flush old entries from the `recentchanges` table; we do this on
1582                                 // random requests so as to avoid an increase in writes for no good reason
1583                                 global $wgRCMaxAge;
1584
1585                                 $dbw = wfGetDB( DB_MASTER );
1586                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1587                                 $dbw->delete(
1588                                         'recentchanges',
1589                                         array( "rc_timestamp < '$cutoff'" ),
1590                                         __METHOD__
1591                                 );
1592                         }
1593                 }
1594
1595                 if ( !$this->mTitle->exists() ) {
1596                         wfProfileOut( __METHOD__ );
1597                         return;
1598                 }
1599
1600                 $id = $this->getId();
1601                 $title = $this->mTitle->getPrefixedDBkey();
1602                 $shortTitle = $this->mTitle->getDBkey();
1603
1604                 if ( !$options['changed'] ) {
1605                         $good = 0;
1606                         $total = 0;
1607                 } elseif ( $options['created'] ) {
1608                         $good = (int)$this->isCountable( $editInfo );
1609                         $total = 1;
1610                 } elseif ( $options['oldcountable'] !== null ) {
1611                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1612                         $total = 0;
1613                 } else {
1614                         $good = 0;
1615                         $total = 0;
1616                 }
1617
1618                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1619                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
1620
1621                 # If this is another user's talk page, update newtalk.
1622                 # Don't do this if $options['changed'] = false (null-edits) nor if
1623                 # it's a minor edit and the user doesn't want notifications for those.
1624                 if ( $options['changed']
1625                         && $this->mTitle->getNamespace() == NS_USER_TALK
1626                         && $shortTitle != $user->getTitleKey()
1627                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1628                 ) {
1629                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1630                                 $other = User::newFromName( $shortTitle, false );
1631                                 if ( !$other ) {
1632                                         wfDebug( __METHOD__ . ": invalid username\n" );
1633                                 } elseif ( User::isIP( $shortTitle ) ) {
1634                                         // An anonymous user
1635                                         $other->setNewtalk( true );
1636                                 } elseif ( $other->isLoggedIn() ) {
1637                                         $other->setNewtalk( true );
1638                                 } else {
1639                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1640                                 }
1641                         }
1642                 }
1643
1644                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1645                         MessageCache::singleton()->replace( $shortTitle, $text );
1646                 }
1647
1648                 if( $options['created'] ) {
1649                         self::onArticleCreate( $this->mTitle );
1650                 } else {
1651                         self::onArticleEdit( $this->mTitle );
1652                 }
1653
1654                 wfProfileOut( __METHOD__ );
1655         }
1656
1657         /**
1658          * Edit an article without doing all that other stuff
1659          * The article must already exist; link tables etc
1660          * are not updated, caches are not flushed.
1661          *
1662          * @param $text String: text submitted
1663          * @param $user User The relevant user
1664          * @param $comment String: comment submitted
1665          * @param $minor Boolean: whereas it's a minor modification
1666          */
1667         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1668                 wfProfileIn( __METHOD__ );
1669
1670                 $dbw = wfGetDB( DB_MASTER );
1671                 $revision = new Revision( array(
1672                         'page'       => $this->getId(),
1673                         'text'       => $text,
1674                         'comment'    => $comment,
1675                         'minor_edit' => $minor ? 1 : 0,
1676                 ) );
1677                 $revision->insertOn( $dbw );
1678                 $this->updateRevisionOn( $dbw, $revision );
1679
1680                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1681
1682                 wfProfileOut( __METHOD__ );
1683         }
1684
1685         /**
1686          * Update the article's restriction field, and leave a log entry.
1687          * This works for protection both existing and non-existing pages.
1688          *
1689          * @param $limit Array: set of restriction keys
1690          * @param $reason String
1691          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1692          * @param $expiry Array: per restriction type expiration
1693          * @param $user User The user updating the restrictions
1694          * @return bool true on success
1695          */
1696         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1697                 global $wgContLang;
1698
1699                 if ( wfReadOnly() ) {
1700                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1701                 }
1702
1703                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1704
1705                 $id = $this->mTitle->getArticleID();
1706
1707                 if ( !$cascade ) {
1708                         $cascade = false;
1709                 }
1710
1711                 // Take this opportunity to purge out expired restrictions
1712                 Title::purgeExpiredRestrictions();
1713
1714                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1715                 # we expect a single selection, but the schema allows otherwise.
1716                 $isProtected = false;
1717                 $protect = false;
1718                 $changed = false;
1719
1720                 $dbw = wfGetDB( DB_MASTER );
1721
1722                 foreach ( $restrictionTypes as $action ) {
1723                         if ( !isset( $expiry[$action] ) ) {
1724                                 $expiry[$action] = $dbw->getInfinity();
1725                         }
1726                         if ( !isset( $limit[$action] ) ) {
1727                                 $limit[$action] = '';
1728                         } elseif ( $limit[$action] != '' ) {
1729                                 $protect = true;
1730                         }
1731
1732                         # Get current restrictions on $action
1733                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1734                         if ( $current != '' ) {
1735                                 $isProtected = true;
1736                         }
1737
1738                         if ( $limit[$action] != $current ) {
1739                                 $changed = true;
1740                         } elseif ( $limit[$action] != '' ) {
1741                                 # Only check expiry change if the action is actually being
1742                                 # protected, since expiry does nothing on an not-protected
1743                                 # action.
1744                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1745                                         $changed = true;
1746                                 }
1747                         }
1748                 }
1749
1750                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1751                         $changed = true;
1752                 }
1753
1754                 # If nothing's changed, do nothing
1755                 if ( !$changed ) {
1756                         return Status::newGood();
1757                 }
1758
1759                 if ( !$protect ) { # No protection at all means unprotection
1760                         $revCommentMsg = 'unprotectedarticle';
1761                         $logAction = 'unprotect';
1762                 } elseif ( $isProtected ) {
1763                         $revCommentMsg = 'modifiedarticleprotection';
1764                         $logAction = 'modify';
1765                 } else {
1766                         $revCommentMsg = 'protectedarticle';
1767                         $logAction = 'protect';
1768                 }
1769
1770                 $encodedExpiry = array();
1771                 $protectDescription = '';
1772                 foreach ( $limit as $action => $restrictions ) {
1773                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1774                         if ( $restrictions != '' ) {
1775                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1776                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1777                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
1778                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1779                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1780                                                 $wgContLang->time( $expiry[$action], false, false ) );
1781                                 } else {
1782                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
1783                                 }
1784
1785                                 $protectDescription .= ') ';
1786                         }
1787                 }
1788                 $protectDescription = trim( $protectDescription );
1789
1790                 if ( $id ) { # Protection of existing page
1791                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1792                                 return Status::newGood();
1793                         }
1794
1795                         # Only restrictions with the 'protect' right can cascade...
1796                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1797                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1798
1799                         # The schema allows multiple restrictions
1800                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1801                                 $cascade = false;
1802                         }
1803
1804                         # Update restrictions table
1805                         foreach ( $limit as $action => $restrictions ) {
1806                                 if ( $restrictions != '' ) {
1807                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1808                                                 array( 'pr_page' => $id,
1809                                                         'pr_type' => $action,
1810                                                         'pr_level' => $restrictions,
1811                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1812                                                         'pr_expiry' => $encodedExpiry[$action]
1813                                                 ),
1814                                                 __METHOD__
1815                                         );
1816                                 } else {
1817                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1818                                                 'pr_type' => $action ), __METHOD__ );
1819                                 }
1820                         }
1821
1822                         # Prepare a null revision to be added to the history
1823                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
1824                         if ( $reason ) {
1825                                 $editComment .= ": $reason";
1826                         }
1827                         if ( $protectDescription ) {
1828                                 $editComment .= " ($protectDescription)";
1829                         }
1830                         if ( $cascade ) {
1831                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1832                         }
1833
1834                         # Insert a null revision
1835                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1836                         $nullRevId = $nullRevision->insertOn( $dbw );
1837
1838                         $latest = $this->getLatest();
1839                         # Update page record
1840                         $dbw->update( 'page',
1841                                 array( /* SET */
1842                                         'page_touched' => $dbw->timestamp(),
1843                                         'page_restrictions' => '',
1844                                         'page_latest' => $nullRevId
1845                                 ), array( /* WHERE */
1846                                         'page_id' => $id
1847                                 ), __METHOD__
1848                         );
1849
1850                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1851                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1852                 } else { # Protection of non-existing page (also known as "title protection")
1853                         # Cascade protection is meaningless in this case
1854                         $cascade = false;
1855
1856                         if ( $limit['create'] != '' ) {
1857                                 $dbw->replace( 'protected_titles',
1858                                         array( array( 'pt_namespace', 'pt_title' ) ),
1859                                         array(
1860                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1861                                                 'pt_title' => $this->mTitle->getDBkey(),
1862                                                 'pt_create_perm' => $limit['create'],
1863                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
1864                                                 'pt_expiry' => $encodedExpiry['create'],
1865                                                 'pt_user' => $user->getId(),
1866                                                 'pt_reason' => $reason,
1867                                         ), __METHOD__
1868                                 );
1869                         } else {
1870                                 $dbw->delete( 'protected_titles',
1871                                         array(
1872                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1873                                                 'pt_title' => $this->mTitle->getDBkey()
1874                                         ), __METHOD__
1875                                 );
1876                         }
1877                 }
1878
1879                 $this->mTitle->flushRestrictions();
1880
1881                 if ( $logAction == 'unprotect' ) {
1882                         $logParams = array();
1883                 } else {
1884                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
1885                 }
1886
1887                 # Update the protection log
1888                 $log = new LogPage( 'protect' );
1889                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
1890
1891                 return Status::newGood();
1892         }
1893
1894         /**
1895          * Take an array of page restrictions and flatten it to a string
1896          * suitable for insertion into the page_restrictions field.
1897          * @param $limit Array
1898          * @return String
1899          */
1900         protected static function flattenRestrictions( $limit ) {
1901                 if ( !is_array( $limit ) ) {
1902                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1903                 }
1904
1905                 $bits = array();
1906                 ksort( $limit );
1907
1908                 foreach ( $limit as $action => $restrictions ) {
1909                         if ( $restrictions != '' ) {
1910                                 $bits[] = "$action=$restrictions";
1911                         }
1912                 }
1913
1914                 return implode( ':', $bits );
1915         }
1916
1917         /**
1918          * Same as doDeleteArticleReal(), but returns more detailed success/failure status
1919          * Deletes the article with database consistency, writes logs, purges caches
1920          *
1921          * @param $reason string delete reason for deletion log
1922          * @param $suppress int bitfield
1923          *      Revision::DELETED_TEXT
1924          *      Revision::DELETED_COMMENT
1925          *      Revision::DELETED_USER
1926          *      Revision::DELETED_RESTRICTED
1927          * @param $id int article ID
1928          * @param $commit boolean defaults to true, triggers transaction end
1929          * @param &$error Array of errors to append to
1930          * @param $user User The deleting user
1931          * @return boolean true if successful
1932          */
1933         public function doDeleteArticle(
1934                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1935         ) {
1936                 return $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user )
1937                         == WikiPage::DELETE_SUCCESS;
1938         }
1939
1940         /**
1941          * Back-end article deletion
1942          * Deletes the article with database consistency, writes logs, purges caches
1943          *
1944          * @param $reason string delete reason for deletion log
1945          * @param $suppress int bitfield
1946          *      Revision::DELETED_TEXT
1947          *      Revision::DELETED_COMMENT
1948          *      Revision::DELETED_USER
1949          *      Revision::DELETED_RESTRICTED
1950          * @param $id int article ID
1951          * @param $commit boolean defaults to true, triggers transaction end
1952          * @param &$error Array of errors to append to
1953          * @param $user User The deleting user
1954          * @return int: One of WikiPage::DELETE_* constants
1955          */
1956         public function doDeleteArticleReal(
1957                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1958         ) {
1959                 global $wgUser;
1960                 $user = is_null( $user ) ? $wgUser : $user;
1961
1962                 wfDebug( __METHOD__ . "\n" );
1963
1964                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1965                         return WikiPage::DELETE_HOOK_ABORTED;
1966                 }
1967                 $dbw = wfGetDB( DB_MASTER );
1968                 $t = $this->mTitle->getDBkey();
1969                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1970
1971                 if ( $t === '' || $id == 0 ) {
1972                         return WikiPage::DELETE_NO_PAGE;
1973                 }
1974
1975                 // Bitfields to further suppress the content
1976                 if ( $suppress ) {
1977                         $bitfield = 0;
1978                         // This should be 15...
1979                         $bitfield |= Revision::DELETED_TEXT;
1980                         $bitfield |= Revision::DELETED_COMMENT;
1981                         $bitfield |= Revision::DELETED_USER;
1982                         $bitfield |= Revision::DELETED_RESTRICTED;
1983                 } else {
1984                         $bitfield = 'rev_deleted';
1985                 }
1986
1987                 $dbw->begin();
1988                 // For now, shunt the revision data into the archive table.
1989                 // Text is *not* removed from the text table; bulk storage
1990                 // is left intact to avoid breaking block-compression or
1991                 // immutable storage schemes.
1992                 //
1993                 // For backwards compatibility, note that some older archive
1994                 // table entries will have ar_text and ar_flags fields still.
1995                 //
1996                 // In the future, we may keep revisions and mark them with
1997                 // the rev_deleted field, which is reserved for this purpose.
1998                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1999                         array(
2000                                 'ar_namespace'  => 'page_namespace',
2001                                 'ar_title'      => 'page_title',
2002                                 'ar_comment'    => 'rev_comment',
2003                                 'ar_user'       => 'rev_user',
2004                                 'ar_user_text'  => 'rev_user_text',
2005                                 'ar_timestamp'  => 'rev_timestamp',
2006                                 'ar_minor_edit' => 'rev_minor_edit',
2007                                 'ar_rev_id'     => 'rev_id',
2008                                 'ar_parent_id'  => 'rev_parent_id',
2009                                 'ar_text_id'    => 'rev_text_id',
2010                                 'ar_text'       => '\'\'', // Be explicit to appease
2011                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2012                                 'ar_len'        => 'rev_len',
2013                                 'ar_page_id'    => 'page_id',
2014                                 'ar_deleted'    => $bitfield,
2015                                 'ar_sha1'       => 'rev_sha1'
2016                         ), array(
2017                                 'page_id' => $id,
2018                                 'page_id = rev_page'
2019                         ), __METHOD__
2020                 );
2021
2022                 # Now that it's safely backed up, delete it
2023                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2024                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2025
2026                 if ( !$ok ) {
2027                         $dbw->rollback();
2028                         return WikiPage::DELETE_NO_REVISIONS;
2029                 }
2030
2031                 $this->doDeleteUpdates( $id );
2032
2033                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2034                 $logtype = $suppress ? 'suppress' : 'delete';
2035
2036                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2037                 $logEntry->setPerformer( $user );
2038                 $logEntry->setTarget( $this->mTitle );
2039                 $logEntry->setComment( $reason );
2040                 $logid = $logEntry->insert();
2041                 $logEntry->publish( $logid );
2042
2043                 if ( $commit ) {
2044                         $dbw->commit();
2045                 }
2046
2047                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2048                 return WikiPage::DELETE_SUCCESS;
2049         }
2050
2051         /**
2052          * Do some database updates after deletion
2053          *
2054          * @param $id Int: page_id value of the page being deleted
2055          */
2056         public function doDeleteUpdates( $id ) {
2057                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2058
2059                 $dbw = wfGetDB( DB_MASTER );
2060
2061                 # Delete restrictions for it
2062                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2063
2064                 # Fix category table counts
2065                 $cats = array();
2066                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2067
2068                 foreach ( $res as $row ) {
2069                         $cats [] = $row->cl_to;
2070                 }
2071
2072                 $this->updateCategoryCounts( array(), $cats );
2073
2074                 # If using cascading deletes, we can skip some explicit deletes
2075                 if ( !$dbw->cascadingDeletes() ) {
2076                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2077
2078                         # Delete outgoing links
2079                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2080                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2081                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2082                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2083                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2084                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2085                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2086                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2087                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2088                 }
2089
2090                 # If using cleanup triggers, we can skip some manual deletes
2091                 if ( !$dbw->cleanupTriggers() ) {
2092                         # Clean up recentchanges entries...
2093                         $dbw->delete( 'recentchanges',
2094                                 array( 'rc_type != ' . RC_LOG,
2095                                         'rc_namespace' => $this->mTitle->getNamespace(),
2096                                         'rc_title' => $this->mTitle->getDBkey() ),
2097                                 __METHOD__ );
2098                         $dbw->delete( 'recentchanges',
2099                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2100                                 __METHOD__ );
2101                 }
2102
2103                 # Clear caches
2104                 self::onArticleDelete( $this->mTitle );
2105
2106                 # Clear the cached article id so the interface doesn't act like we exist
2107                 $this->mTitle->resetArticleID( 0 );
2108         }
2109
2110         /**
2111          * Roll back the most recent consecutive set of edits to a page
2112          * from the same user; fails if there are no eligible edits to
2113          * roll back to, e.g. user is the sole contributor. This function
2114          * performs permissions checks on $user, then calls commitRollback()
2115          * to do the dirty work
2116          *
2117          * @todo: seperate the business/permission stuff out from backend code
2118          *
2119          * @param $fromP String: Name of the user whose edits to rollback.
2120          * @param $summary String: Custom summary. Set to default summary if empty.
2121          * @param $token String: Rollback token.
2122          * @param $bot Boolean: If true, mark all reverted edits as bot.
2123          *
2124          * @param $resultDetails Array: contains result-specific array of additional values
2125          *    'alreadyrolled' : 'current' (rev)
2126          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2127          *
2128          * @param $user User The user performing the rollback
2129          * @return array of errors, each error formatted as
2130          *   array(messagekey, param1, param2, ...).
2131          * On success, the array is empty.  This array can also be passed to
2132          * OutputPage::showPermissionsErrorPage().
2133          */
2134         public function doRollback(
2135                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2136         ) {
2137                 $resultDetails = null;
2138
2139                 # Check permissions
2140                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2141                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2142                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2143
2144                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2145                         $errors[] = array( 'sessionfailure' );
2146                 }
2147
2148                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2149                         $errors[] = array( 'actionthrottledtext' );
2150                 }
2151
2152                 # If there were errors, bail out now
2153                 if ( !empty( $errors ) ) {
2154                         return $errors;
2155                 }
2156
2157                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2158         }
2159
2160         /**
2161          * Backend implementation of doRollback(), please refer there for parameter
2162          * and return value documentation
2163          *
2164          * NOTE: This function does NOT check ANY permissions, it just commits the
2165          * rollback to the DB. Therefore, you should only call this function direct-
2166          * ly if you want to use custom permissions checks. If you don't, use
2167          * doRollback() instead.
2168          * @param $fromP String: Name of the user whose edits to rollback.
2169          * @param $summary String: Custom summary. Set to default summary if empty.
2170          * @param $bot Boolean: If true, mark all reverted edits as bot.
2171          *
2172          * @param $resultDetails Array: contains result-specific array of additional values
2173          * @param $guser User The user performing the rollback
2174          * @return array
2175          */
2176         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2177                 global $wgUseRCPatrol, $wgContLang;
2178
2179                 $dbw = wfGetDB( DB_MASTER );
2180
2181                 if ( wfReadOnly() ) {
2182                         return array( array( 'readonlytext' ) );
2183                 }
2184
2185                 # Get the last editor
2186                 $current = $this->getRevision();
2187                 if ( is_null( $current ) ) {
2188                         # Something wrong... no page?
2189                         return array( array( 'notanarticle' ) );
2190                 }
2191
2192                 $from = str_replace( '_', ' ', $fromP );
2193                 # User name given should match up with the top revision.
2194                 # If the user was deleted then $from should be empty.
2195                 if ( $from != $current->getUserText() ) {
2196                         $resultDetails = array( 'current' => $current );
2197                         return array( array( 'alreadyrolled',
2198                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2199                                 htmlspecialchars( $fromP ),
2200                                 htmlspecialchars( $current->getUserText() )
2201                         ) );
2202                 }
2203
2204                 # Get the last edit not by this guy...
2205                 # Note: these may not be public values
2206                 $user = intval( $current->getRawUser() );
2207                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2208                 $s = $dbw->selectRow( 'revision',
2209                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2210                         array( 'rev_page' => $current->getPage(),
2211                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2212                         ), __METHOD__,
2213                         array( 'USE INDEX' => 'page_timestamp',
2214                                 'ORDER BY' => 'rev_timestamp DESC' )
2215                         );
2216                 if ( $s === false ) {
2217                         # No one else ever edited this page
2218                         return array( array( 'cantrollback' ) );
2219                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2220                         # Only admins can see this text
2221                         return array( array( 'notvisiblerev' ) );
2222                 }
2223
2224                 $set = array();
2225                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2226                         # Mark all reverted edits as bot
2227                         $set['rc_bot'] = 1;
2228                 }
2229
2230                 if ( $wgUseRCPatrol ) {
2231                         # Mark all reverted edits as patrolled
2232                         $set['rc_patrolled'] = 1;
2233                 }
2234
2235                 if ( count( $set ) ) {
2236                         $dbw->update( 'recentchanges', $set,
2237                                 array( /* WHERE */
2238                                         'rc_cur_id' => $current->getPage(),
2239                                         'rc_user_text' => $current->getUserText(),
2240                                         "rc_timestamp > '{$s->rev_timestamp}'",
2241                                 ), __METHOD__
2242                         );
2243                 }
2244
2245                 # Generate the edit summary if necessary
2246                 $target = Revision::newFromId( $s->rev_id );
2247                 if ( empty( $summary ) ) {
2248                         if ( $from == '' ) { // no public user name
2249                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2250                         } else {
2251                                 $summary = wfMsgForContent( 'revertpage' );
2252                         }
2253                 }
2254
2255                 # Allow the custom summary to use the same args as the default message
2256                 $args = array(
2257                         $target->getUserText(), $from, $s->rev_id,
2258                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2259                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2260                 );
2261                 $summary = wfMsgReplaceArgs( $summary, $args );
2262
2263                 # Save
2264                 $flags = EDIT_UPDATE;
2265
2266                 if ( $guser->isAllowed( 'minoredit' ) ) {
2267                         $flags |= EDIT_MINOR;
2268                 }
2269
2270                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2271                         $flags |= EDIT_FORCE_BOT;
2272                 }
2273
2274                 # Actually store the edit
2275                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId(), $guser );
2276                 if ( !empty( $status->value['revision'] ) ) {
2277                         $revId = $status->value['revision']->getId();
2278                 } else {
2279                         $revId = false;
2280                 }
2281
2282                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2283
2284                 $resultDetails = array(
2285                         'summary' => $summary,
2286                         'current' => $current,
2287                         'target'  => $target,
2288                         'newid'   => $revId
2289                 );
2290
2291                 return array();
2292         }
2293
2294         /**
2295          * The onArticle*() functions are supposed to be a kind of hooks
2296          * which should be called whenever any of the specified actions
2297          * are done.
2298          *
2299          * This is a good place to put code to clear caches, for instance.
2300          *
2301          * This is called on page move and undelete, as well as edit
2302          *
2303          * @param $title Title object
2304          */
2305         public static function onArticleCreate( $title ) {
2306                 # Update existence markers on article/talk tabs...
2307                 if ( $title->isTalkPage() ) {
2308                         $other = $title->getSubjectPage();
2309                 } else {
2310                         $other = $title->getTalkPage();
2311                 }
2312
2313                 $other->invalidateCache();
2314                 $other->purgeSquid();
2315
2316                 $title->touchLinks();
2317                 $title->purgeSquid();
2318                 $title->deleteTitleProtection();
2319         }
2320
2321         /**
2322          * Clears caches when article is deleted
2323          *
2324          * @param $title Title
2325          */
2326         public static function onArticleDelete( $title ) {
2327                 # Update existence markers on article/talk tabs...
2328                 if ( $title->isTalkPage() ) {
2329                         $other = $title->getSubjectPage();
2330                 } else {
2331                         $other = $title->getTalkPage();
2332                 }
2333
2334                 $other->invalidateCache();
2335                 $other->purgeSquid();
2336
2337                 $title->touchLinks();
2338                 $title->purgeSquid();
2339
2340                 # File cache
2341                 HTMLFileCache::clearFileCache( $title );
2342
2343                 # Messages
2344                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2345                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2346                 }
2347
2348                 # Images
2349                 if ( $title->getNamespace() == NS_FILE ) {
2350                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2351                         $update->doUpdate();
2352                 }
2353
2354                 # User talk pages
2355                 if ( $title->getNamespace() == NS_USER_TALK ) {
2356                         $user = User::newFromName( $title->getText(), false );
2357                         if ( $user ) {
2358                                 $user->setNewtalk( false );
2359                         }
2360                 }
2361
2362                 # Image redirects
2363                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2364         }
2365
2366         /**
2367          * Purge caches on page update etc
2368          *
2369          * @param $title Title object
2370          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2371          */
2372         public static function onArticleEdit( $title ) {
2373                 // Invalidate caches of articles which include this page
2374                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2375
2376
2377                 // Invalidate the caches of all pages which redirect here
2378                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2379
2380                 # Purge squid for this page only
2381                 $title->purgeSquid();
2382
2383                 # Clear file cache for this page only
2384                 HTMLFileCache::clearFileCache( $title );
2385         }
2386
2387         /**#@-*/
2388
2389         /**
2390          * Returns a list of hidden categories this page is a member of.
2391          * Uses the page_props and categorylinks tables.
2392          *
2393          * @return Array of Title objects
2394          */
2395         public function getHiddenCategories() {
2396                 $result = array();
2397                 $id = $this->mTitle->getArticleID();
2398
2399                 if ( $id == 0 ) {
2400                         return array();
2401                 }
2402
2403                 $dbr = wfGetDB( DB_SLAVE );
2404                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2405                         array( 'cl_to' ),
2406                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2407                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2408                         __METHOD__ );
2409
2410                 if ( $res !== false ) {
2411                         foreach ( $res as $row ) {
2412                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2413                         }
2414                 }
2415
2416                 return $result;
2417         }
2418
2419         /**
2420         * Return an applicable autosummary if one exists for the given edit.
2421         * @param $oldtext String: the previous text of the page.
2422         * @param $newtext String: The submitted text of the page.
2423         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2424         * @return string An appropriate autosummary, or an empty string.
2425         */
2426         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2427                 global $wgContLang;
2428
2429                 # Decide what kind of autosummary is needed.
2430
2431                 # Redirect autosummaries
2432                 $ot = Title::newFromRedirect( $oldtext );
2433                 $rt = Title::newFromRedirect( $newtext );
2434
2435                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2436                         $truncatedtext = $wgContLang->truncate(
2437                                 str_replace( "\n", ' ', $newtext ),
2438                                 max( 0, 250
2439                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2440                                         - strlen( $rt->getFullText() )
2441                                 ) );
2442                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2443                 }
2444
2445                 # New page autosummaries
2446                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2447                         # If they're making a new article, give its text, truncated, in the summary.
2448
2449                         $truncatedtext = $wgContLang->truncate(
2450                                 str_replace( "\n", ' ', $newtext ),
2451                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2452
2453                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2454                 }
2455
2456                 # Blanking autosummaries
2457                 if ( $oldtext != '' && $newtext == '' ) {
2458                         return wfMsgForContent( 'autosumm-blank' );
2459                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2460                         # Removing more than 90% of the article
2461
2462                         $truncatedtext = $wgContLang->truncate(
2463                                 $newtext,
2464                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2465
2466                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2467                 }
2468
2469                 # If we reach this point, there's no applicable autosummary for our case, so our
2470                 # autosummary is empty.
2471                 return '';
2472         }
2473
2474         /**
2475          * Auto-generates a deletion reason
2476          *
2477          * @param &$hasHistory Boolean: whether the page has a history
2478          * @return mixed String containing deletion reason or empty string, or boolean false
2479          *    if no revision occurred
2480          */
2481         public function getAutoDeleteReason( &$hasHistory ) {
2482                 global $wgContLang;
2483
2484                 // Get the last revision
2485                 $rev = $this->getRevision();
2486
2487                 if ( is_null( $rev ) ) {
2488                         return false;
2489                 }
2490
2491                 // Get the article's contents
2492                 $contents = $rev->getText();
2493                 $blank = false;
2494
2495                 // If the page is blank, use the text from the previous revision,
2496                 // which can only be blank if there's a move/import/protect dummy revision involved
2497                 if ( $contents == '' ) {
2498                         $prev = $rev->getPrevious();
2499
2500                         if ( $prev )    {
2501                                 $contents = $prev->getText();
2502                                 $blank = true;
2503                         }
2504                 }
2505
2506                 $dbw = wfGetDB( DB_MASTER );
2507
2508                 // Find out if there was only one contributor
2509                 // Only scan the last 20 revisions
2510                 $res = $dbw->select( 'revision', 'rev_user_text',
2511                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2512                         __METHOD__,
2513                         array( 'LIMIT' => 20 )
2514                 );
2515
2516                 if ( $res === false ) {
2517                         // This page has no revisions, which is very weird
2518                         return false;
2519                 }
2520
2521                 $hasHistory = ( $res->numRows() > 1 );
2522                 $row = $dbw->fetchObject( $res );
2523
2524                 if ( $row ) { // $row is false if the only contributor is hidden
2525                         $onlyAuthor = $row->rev_user_text;
2526                         // Try to find a second contributor
2527                         foreach ( $res as $row ) {
2528                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2529                                         $onlyAuthor = false;
2530                                         break;
2531                                 }
2532                         }
2533                 } else {
2534                         $onlyAuthor = false;
2535                 }
2536
2537                 // Generate the summary with a '$1' placeholder
2538                 if ( $blank ) {
2539                         // The current revision is blank and the one before is also
2540                         // blank. It's just not our lucky day
2541                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2542                 } else {
2543                         if ( $onlyAuthor ) {
2544                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2545                         } else {
2546                                 $reason = wfMsgForContent( 'excontent', '$1' );
2547                         }
2548                 }
2549
2550                 if ( $reason == '-' ) {
2551                         // Allow these UI messages to be blanked out cleanly
2552                         return '';
2553                 }
2554
2555                 // Replace newlines with spaces to prevent uglyness
2556                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2557                 // Calculate the maximum amount of chars to get
2558                 // Max content length = max comment length - length of the comment (excl. $1)
2559                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2560                 $contents = $wgContLang->truncate( $contents, $maxLength );
2561                 // Remove possible unfinished links
2562                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2563                 // Now replace the '$1' placeholder
2564                 $reason = str_replace( '$1', $contents, $reason );
2565
2566                 return $reason;
2567         }
2568
2569         /**
2570          * Update all the appropriate counts in the category table, given that
2571          * we've added the categories $added and deleted the categories $deleted.
2572          *
2573          * @param $added array   The names of categories that were added
2574          * @param $deleted array The names of categories that were deleted
2575          */
2576         public function updateCategoryCounts( $added, $deleted ) {
2577                 $ns = $this->mTitle->getNamespace();
2578                 $dbw = wfGetDB( DB_MASTER );
2579
2580                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2581                 # exist, we might legitimately not create it, but it's simpler to just
2582                 # create it and then give it a negative value, since the value is bogus
2583                 # anyway.
2584                 #
2585                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2586                 $insertCats = array_merge( $added, $deleted );
2587                 if ( !$insertCats ) {
2588                         # Okay, nothing to do
2589                         return;
2590                 }
2591
2592                 $insertRows = array();
2593
2594                 foreach ( $insertCats as $cat ) {
2595                         $insertRows[] = array(
2596                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2597                                 'cat_title' => $cat
2598                         );
2599                 }
2600                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2601
2602                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2603                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2604
2605                 if ( $ns == NS_CATEGORY ) {
2606                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2607                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2608                 } elseif ( $ns == NS_FILE ) {
2609                         $addFields[]    = 'cat_files = cat_files + 1';
2610                         $removeFields[] = 'cat_files = cat_files - 1';
2611                 }
2612
2613                 if ( $added ) {
2614                         $dbw->update(
2615                                 'category',
2616                                 $addFields,
2617                                 array( 'cat_title' => $added ),
2618                                 __METHOD__
2619                         );
2620                 }
2621
2622                 if ( $deleted ) {
2623                         $dbw->update(
2624                                 'category',
2625                                 $removeFields,
2626                                 array( 'cat_title' => $deleted ),
2627                                 __METHOD__
2628                         );
2629                 }
2630         }
2631
2632         /**
2633          * Updates cascading protections
2634          *
2635          * @param $parserOutput ParserOutput object for the current version
2636          */
2637         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2638                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2639                         return;
2640                 }
2641
2642                 // templatelinks table may have become out of sync,
2643                 // especially if using variable-based transclusions.
2644                 // For paranoia, check if things have changed and if
2645                 // so apply updates to the database. This will ensure
2646                 // that cascaded protections apply as soon as the changes
2647                 // are visible.
2648
2649                 # Get templates from templatelinks
2650                 $id = $this->mTitle->getArticleID();
2651
2652                 $tlTemplates = array();
2653
2654                 $dbr = wfGetDB( DB_SLAVE );
2655                 $res = $dbr->select( array( 'templatelinks' ),
2656                         array( 'tl_namespace', 'tl_title' ),
2657                         array( 'tl_from' => $id ),
2658                         __METHOD__
2659                 );
2660
2661                 foreach ( $res as $row ) {
2662                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2663                 }
2664
2665                 # Get templates from parser output.
2666                 $poTemplates = array();
2667                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2668                         foreach ( $templates as $dbk => $id ) {
2669                                 $poTemplates["$ns:$dbk"] = true;
2670                         }
2671                 }
2672
2673                 # Get the diff
2674                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2675
2676                 if ( count( $templates_diff ) > 0 ) {
2677                         # Whee, link updates time.
2678                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2679                         $u->doUpdate();
2680                 }
2681         }
2682
2683         /**
2684          * Return a list of templates used by this article.
2685          * Uses the templatelinks table
2686          *
2687          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2688          * @return Array of Title objects
2689          */
2690         public function getUsedTemplates() {
2691                 return $this->mTitle->getTemplateLinksFrom();
2692         }
2693
2694         /**
2695          * Perform article updates on a special page creation.
2696          *
2697          * @param $rev Revision object
2698          *
2699          * @todo This is a shitty interface function. Kill it and replace the
2700          * other shitty functions like doEditUpdates and such so it's not needed
2701          * anymore.
2702          * @deprecated since 1.18, use doEditUpdates()
2703          */
2704         public function createUpdates( $rev ) {
2705                 wfDeprecated( __METHOD__, '1.18' );
2706                 global $wgUser;
2707                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2708         }
2709
2710         /**
2711          * This function is called right before saving the wikitext,
2712          * so we can do things like signatures and links-in-context.
2713          *
2714          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2715          * @param $text String article contents
2716          * @param $user User object: user doing the edit
2717          * @param $popts ParserOptions object: parser options, default options for
2718          *               the user loaded if null given
2719          * @return string article contents with altered wikitext markup (signatures
2720          *      converted, {{subst:}}, templates, etc.)
2721          */
2722         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2723                 global $wgParser, $wgUser;
2724
2725                 wfDeprecated( __METHOD__, '1.19' );
2726
2727                 $user = is_null( $user ) ? $wgUser : $user;
2728
2729                 if ( $popts === null ) {
2730                         $popts = ParserOptions::newFromUser( $user );
2731                 }
2732
2733                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2734         }
2735
2736         /**
2737          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2738          *
2739          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2740          * @return bool
2741          */
2742         public function isBigDeletion() {
2743                 wfDeprecated( __METHOD__, '1.19' );
2744                 return $this->mTitle->isBigDeletion();
2745         }
2746
2747         /**
2748          * Get the  approximate revision count of this page.
2749          *
2750          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2751          * @return int
2752          */
2753         public function estimateRevisionCount() {
2754                 wfDeprecated( __METHOD__, '1.19' );
2755                 return $this->mTitle->estimateRevisionCount();
2756         }
2757
2758         /**
2759          * Update the article's restriction field, and leave a log entry.
2760          *
2761          * @deprecated since 1.19
2762          * @param $limit Array: set of restriction keys
2763          * @param $reason String
2764          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2765          * @param $expiry Array: per restriction type expiration
2766          * @param $user User The user updating the restrictions
2767          * @return bool true on success
2768          */
2769         public function updateRestrictions(
2770                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2771         ) {
2772                 global $wgUser;
2773
2774                 $user = is_null( $user ) ? $wgUser : $user;
2775
2776                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2777         }
2778
2779         /**
2780          * @deprecated since 1.18
2781          */
2782         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2783                 wfDeprecated( __METHOD__, '1.18' );
2784                 global $wgUser;
2785                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2786         }
2787
2788         /**
2789          * @deprecated since 1.18
2790          */
2791         public function viewUpdates() {
2792                 wfDeprecated( __METHOD__, '1.18' );
2793                 global $wgUser;
2794                 return $this->doViewUpdates( $wgUser );
2795         }
2796
2797         /**
2798          * @deprecated since 1.18
2799          * @return bool
2800          */
2801         public function useParserCache( $oldid ) {
2802                 wfDeprecated( __METHOD__, '1.18' );
2803                 global $wgUser;
2804                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2805         }
2806 }
2807
2808 class PoolWorkArticleView extends PoolCounterWork {
2809
2810         /**
2811          * @var Page
2812          */
2813         private $page;
2814
2815         /**
2816          * @var string
2817          */
2818         private $cacheKey;
2819
2820         /**
2821          * @var integer
2822          */
2823         private $revid;
2824
2825         /**
2826          * @var ParserOptions
2827          */
2828         private $parserOptions;
2829
2830         /**
2831          * @var string|null
2832          */
2833         private $text;
2834
2835         /**
2836          * @var ParserOutput|bool
2837          */
2838         private $parserOutput = false;
2839
2840         /**
2841          * @var bool
2842          */
2843         private $isDirty = false;
2844
2845         /**
2846          * @var Status|bool
2847          */
2848         private $error = false;
2849
2850         /**
2851          * Constructor
2852          *
2853          * @param $page Page
2854          * @param $revid Integer: ID of the revision being parsed
2855          * @param $useParserCache Boolean: whether to use the parser cache
2856          * @param $parserOptions parserOptions to use for the parse operation
2857          * @param $text String: text to parse or null to load it
2858          */
2859         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $text = null ) {
2860                 $this->page = $page;
2861                 $this->revid = $revid;
2862                 $this->cacheable = $useParserCache;
2863                 $this->parserOptions = $parserOptions;
2864                 $this->text = $text;
2865                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
2866                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
2867         }
2868
2869         /**
2870          * Get the ParserOutput from this object, or false in case of failure
2871          *
2872          * @return ParserOutput
2873          */
2874         public function getParserOutput() {
2875                 return $this->parserOutput;
2876         }
2877
2878         /**
2879          * Get whether the ParserOutput is a dirty one (i.e. expired)
2880          *
2881          * @return bool
2882          */
2883         public function getIsDirty() {
2884                 return $this->isDirty;
2885         }
2886
2887         /**
2888          * Get a Status object in case of error or false otherwise
2889          *
2890          * @return Status|bool
2891          */
2892         public function getError() {
2893                 return $this->error;
2894         }
2895
2896         /**
2897          * @return bool
2898          */
2899         function doWork() {
2900                 global $wgParser, $wgUseFileCache;
2901
2902                 $isCurrent = $this->revid === $this->page->getLatest();
2903
2904                 if ( $this->text !== null ) {
2905                         $text = $this->text;
2906                 } elseif ( $isCurrent ) {
2907                         $text = $this->page->getRawText();
2908                 } else {
2909                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
2910                         if ( $rev === null ) {
2911                                 return false;
2912                         }
2913                         $text = $rev->getText();
2914                 }
2915
2916                 $time = - microtime( true );
2917                 $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
2918                         $this->parserOptions, true, true, $this->revid );
2919                 $time += microtime( true );
2920
2921                 # Timing hack
2922                 if ( $time > 3 ) {
2923                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2924                                 $this->page->getTitle()->getPrefixedDBkey() ) );
2925                 }
2926
2927                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
2928                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
2929                 }
2930
2931                 // Make sure file cache is not used on uncacheable content.
2932                 // Output that has magic words in it can still use the parser cache
2933                 // (if enabled), though it will generally expire sooner.
2934                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
2935                         $wgUseFileCache = false;
2936                 }
2937
2938                 if ( $isCurrent ) {
2939                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
2940                 }
2941
2942                 return true;
2943         }
2944
2945         /**
2946          * @return bool
2947          */
2948         function getCachedWork() {
2949                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
2950
2951                 if ( $this->parserOutput === false ) {
2952                         wfDebug( __METHOD__ . ": parser cache miss\n" );
2953                         return false;
2954                 } else {
2955                         wfDebug( __METHOD__ . ": parser cache hit\n" );
2956                         return true;
2957                 }
2958         }
2959
2960         /**
2961          * @return bool
2962          */
2963         function fallback() {
2964                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
2965
2966                 if ( $this->parserOutput === false ) {
2967                         wfDebugLog( 'dirty', "dirty missing\n" );
2968                         wfDebug( __METHOD__ . ": no dirty cache\n" );
2969                         return false;
2970                 } else {
2971                         wfDebug( __METHOD__ . ": sending dirty output\n" );
2972                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
2973                         $this->isDirty = true;
2974                         return true;
2975                 }
2976         }
2977
2978         /**
2979          * @param $status Status
2980          * @return bool
2981          */
2982         function error( $status ) {
2983                 $this->error = $status;
2984                 return false;
2985         }
2986 }