includes/page/PageArchive.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 use MediaWiki\MediaWikiServices;
  22 use Wikimedia\Rdbms\ResultWrapper;
  23 use Wikimedia\Rdbms\IDatabase;
  24
  25 /**
  26  * Used to show archived pages and eventually restore them.
  27  */
  28 class PageArchive {
  29         /** @var Title */
  30         protected $title;
  31
  32         /** @var Status */
  33         protected $fileStatus;
  34
  35         /** @var Status */
  36         protected $revisionStatus;
  37
  38         /** @var Config */
  39         protected $config;
  40
  41         public function __construct( $title, Config $config = null ) {
  42                 if ( is_null( $title ) ) {
  43                         throw new MWException( __METHOD__ . ' given a null title.' );
  44                 }
  45                 $this->title = $title;
  46                 if ( $config === null ) {
  47                         wfDebug( __METHOD__ . ' did not have a Config object passed to it' );
  48                         $config = MediaWikiServices::getInstance()->getMainConfig();
  49                 }
  50                 $this->config = $config;
  51         }
  52
  53         public function doesWrites() {
  54                 return true;
  55         }
  56
  57         /**
  58          * List all deleted pages recorded in the archive table. Returns result
  59          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  60          * namespace/title.
  61          *
  62          * @return ResultWrapper
  63          */
  64         public static function listAllPages() {
  65                 $dbr = wfGetDB( DB_REPLICA );
  66
  67                 return self::listPages( $dbr, '' );
  68         }
  69
  70         /**
  71          * List deleted pages recorded in the archive matching the
  72          * given term, using search engine archive.
  73          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  74          *
  75          * @param string $term Search term
  76          * @return ResultWrapper
  77          */
  78         public static function listPagesBySearch( $term ) {
  79                 $title = Title::newFromText( $term );
  80                 if ( $title ) {
  81                         $ns = $title->getNamespace();
  82                         $termMain = $title->getText();
  83                         $termDb = $title->getDBkey();
  84                 } else {
  85                         // Prolly won't work too good
  86                         // @todo handle bare namespace names cleanly?
  87                         $ns = 0;
  88                         $termMain = $termDb = $term;
  89                 }
  90
  91                 // Try search engine first
  92                 $engine = MediaWikiServices::getInstance()->newSearchEngine();
  93                 $engine->setLimitOffset( 100 );
  94                 $engine->setNamespaces( [ $ns ] );
  95                 $results = $engine->searchArchiveTitle( $termMain );
  96                 if ( !$results->isOK() ) {
  97                         $results = [];
  98                 } else {
  99                         $results = $results->getValue();
 100                 }
 101
 102                 if ( !$results ) {
 103                         // Fall back to regular prefix search
 104                         return self::listPagesByPrefix( $term );
 105                 }
 106
 107                 $dbr = wfGetDB( DB_REPLICA );
 108                 $condTitles = array_unique( array_map( function ( Title $t ) {
 109                         return $t->getDBkey();
 110                 }, $results ) );
 111                 $conds = [
 112                         'ar_namespace' => $ns,
 113                         $dbr->makeList( [ 'ar_title' => $condTitles ], LIST_OR ) . " OR ar_title " .
 114                         $dbr->buildLike( $termDb, $dbr->anyString() )
 115                 ];
 116
 117                 return self::listPages( $dbr, $conds );
 118         }
 119
 120         /**
 121          * List deleted pages recorded in the archive table matching the
 122          * given title prefix.
 123          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
 124          *
 125          * @param string $prefix Title prefix
 126          * @return ResultWrapper
 127          */
 128         public static function listPagesByPrefix( $prefix ) {
 129                 $dbr = wfGetDB( DB_REPLICA );
 130
 131                 $title = Title::newFromText( $prefix );
 132                 if ( $title ) {
 133                         $ns = $title->getNamespace();
 134                         $prefix = $title->getDBkey();
 135                 } else {
 136                         // Prolly won't work too good
 137                         // @todo handle bare namespace names cleanly?
 138                         $ns = 0;
 139                 }
 140
 141                 $conds = [
 142                         'ar_namespace' => $ns,
 143                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
 144                 ];
 145
 146                 return self::listPages( $dbr, $conds );
 147         }
 148
 149         /**
 150          * @param IDatabase $dbr
 151          * @param string|array $condition
 152          * @return bool|ResultWrapper
 153          */
 154         protected static function listPages( $dbr, $condition ) {
 155                 return $dbr->select(
 156                         [ 'archive' ],
 157                         [
 158                                 'ar_namespace',
 159                                 'ar_title',
 160                                 'count' => 'COUNT(*)'
 161                         ],
 162                         $condition,
 163                         __METHOD__,
 164                         [
 165                                 'GROUP BY' => [ 'ar_namespace', 'ar_title' ],
 166                                 'ORDER BY' => [ 'ar_namespace', 'ar_title' ],
 167                                 'LIMIT' => 100,
 168                         ]
 169                 );
 170         }
 171
 172         /**
 173          * List the revisions of the given page. Returns result wrapper with
 174          * various archive table fields.
 175          *
 176          * @return ResultWrapper
 177          */
 178         public function listRevisions() {
 179                 $revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
 180                 $queryInfo = $revisionStore->getArchiveQueryInfo();
 181
 182                 $conds = [
 183                         'ar_namespace' => $this->title->getNamespace(),
 184                         'ar_title' => $this->title->getDBkey(),
 185                 ];
 186                 $options = [ 'ORDER BY' => 'ar_timestamp DESC' ];
 187
 188                 ChangeTags::modifyDisplayQuery(
 189                         $queryInfo['tables'],
 190                         $queryInfo['fields'],
 191                         $conds,
 192                         $queryInfo['joins'],
 193                         $options,
 194                         ''
 195                 );
 196
 197                 $dbr = wfGetDB( DB_REPLICA );
 198                 return $dbr->select(
 199                         $queryInfo['tables'],
 200                         $queryInfo['fields'],
 201                         $conds,
 202                         __METHOD__,
 203                         $options,
 204                         $queryInfo['joins']
 205                 );
 206         }
 207
 208         /**
 209          * List the deleted file revisions for this page, if it's a file page.
 210          * Returns a result wrapper with various filearchive fields, or null
 211          * if not a file page.
 212          *
 213          * @return ResultWrapper
 214          * @todo Does this belong in Image for fuller encapsulation?
 215          */
 216         public function listFiles() {
 217                 if ( $this->title->getNamespace() != NS_FILE ) {
 218                         return null;
 219                 }
 220
 221                 $dbr = wfGetDB( DB_REPLICA );
 222                 $fileQuery = ArchivedFile::getQueryInfo();
 223                 return $dbr->select(
 224                         $fileQuery['tables'],
 225                         $fileQuery['fields'],
 226                         [ 'fa_name' => $this->title->getDBkey() ],
 227                         __METHOD__,
 228                         [ 'ORDER BY' => 'fa_timestamp DESC' ],
 229                         $fileQuery['joins']
 230                 );
 231         }
 232
 233         /**
 234          * Return a Revision object containing data for the deleted revision.
 235          * Note that the result *may* or *may not* have a null page ID.
 236          *
 237          * @param string $timestamp
 238          * @return Revision|null
 239          */
 240         public function getRevision( $timestamp ) {
 241                 $dbr = wfGetDB( DB_REPLICA );
 242                 $arQuery = Revision::getArchiveQueryInfo();
 243
 244                 $row = $dbr->selectRow(
 245                         $arQuery['tables'],
 246                         $arQuery['fields'],
 247                         [
 248                                 'ar_namespace' => $this->title->getNamespace(),
 249                                 'ar_title' => $this->title->getDBkey(),
 250                                 'ar_timestamp' => $dbr->timestamp( $timestamp )
 251                         ],
 252                         __METHOD__,
 253                         [],
 254                         $arQuery['joins']
 255                 );
 256
 257                 if ( $row ) {
 258                         return Revision::newFromArchiveRow( $row, [ 'title' => $this->title ] );
 259                 }
 260
 261                 return null;
 262         }
 263
 264         /**
 265          * Return the most-previous revision, either live or deleted, against
 266          * the deleted revision given by timestamp.
 267          *
 268          * May produce unexpected results in case of history merges or other
 269          * unusual time issues.
 270          *
 271          * @param string $timestamp
 272          * @return Revision|null Null when there is no previous revision
 273          */
 274         public function getPreviousRevision( $timestamp ) {
 275                 $dbr = wfGetDB( DB_REPLICA );
 276
 277                 // Check the previous deleted revision...
 278                 $row = $dbr->selectRow( 'archive',
 279                         'ar_timestamp',
 280                         [ 'ar_namespace' => $this->title->getNamespace(),
 281                                 'ar_title' => $this->title->getDBkey(),
 282                                 'ar_timestamp < ' .
 283                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ],
 284                         __METHOD__,
 285                         [
 286                                 'ORDER BY' => 'ar_timestamp DESC',
 287                                 'LIMIT' => 1 ] );
 288                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 289
 290                 $row = $dbr->selectRow( [ 'page', 'revision' ],
 291                         [ 'rev_id', 'rev_timestamp' ],
 292                         [
 293                                 'page_namespace' => $this->title->getNamespace(),
 294                                 'page_title' => $this->title->getDBkey(),
 295                                 'page_id = rev_page',
 296                                 'rev_timestamp < ' .
 297                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ],
 298                         __METHOD__,
 299                         [
 300                                 'ORDER BY' => 'rev_timestamp DESC',
 301                                 'LIMIT' => 1 ] );
 302                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 303                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 304
 305                 if ( $prevLive && $prevLive > $prevDeleted ) {
 306                         // Most prior revision was live
 307                         return Revision::newFromId( $prevLiveId );
 308                 } elseif ( $prevDeleted ) {
 309                         // Most prior revision was deleted
 310                         return $this->getRevision( $prevDeleted );
 311                 }
 312
 313                 // No prior revision on this page.
 314                 return null;
 315         }
 316
 317         /**
 318          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 319          *
 320          * @param object $row Database row
 321          * @return string
 322          */
 323         public function getTextFromRow( $row ) {
 324                 if ( is_null( $row->ar_text_id ) ) {
 325                         // An old row from MediaWiki 1.4 or previous.
 326                         // Text is embedded in this row in classic compression format.
 327                         return Revision::getRevisionText( $row, 'ar_' );
 328                 }
 329
 330                 // New-style: keyed to the text storage backend.
 331                 $dbr = wfGetDB( DB_REPLICA );
 332                 $text = $dbr->selectRow( 'text',
 333                         [ 'old_text', 'old_flags' ],
 334                         [ 'old_id' => $row->ar_text_id ],
 335                         __METHOD__ );
 336
 337                 return Revision::getRevisionText( $text );
 338         }
 339
 340         /**
 341          * Fetch (and decompress if necessary) the stored text of the most
 342          * recently edited deleted revision of the page.
 343          *
 344          * If there are no archived revisions for the page, returns NULL.
 345          *
 346          * @return string|null
 347          */
 348         public function getLastRevisionText() {
 349                 $dbr = wfGetDB( DB_REPLICA );
 350                 $row = $dbr->selectRow( 'archive',
 351                         [ 'ar_text', 'ar_flags', 'ar_text_id' ],
 352                         [ 'ar_namespace' => $this->title->getNamespace(),
 353                                 'ar_title' => $this->title->getDBkey() ],
 354                         __METHOD__,
 355                         [ 'ORDER BY' => 'ar_timestamp DESC' ] );
 356
 357                 if ( $row ) {
 358                         return $this->getTextFromRow( $row );
 359                 }
 360
 361                 return null;
 362         }
 363
 364         /**
 365          * Quick check if any archived revisions are present for the page.
 366          *
 367          * @return bool
 368          */
 369         public function isDeleted() {
 370                 $dbr = wfGetDB( DB_REPLICA );
 371                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 372                         [ 'ar_namespace' => $this->title->getNamespace(),
 373                                 'ar_title' => $this->title->getDBkey() ],
 374                         __METHOD__
 375                 );
 376
 377                 return ( $n > 0 );
 378         }
 379
 380         /**
 381          * Restore the given (or all) text and file revisions for the page.
 382          * Once restored, the items will be removed from the archive tables.
 383          * The deletion log will be updated with an undeletion notice.
 384          *
 385          * This also sets Status objects, $this->fileStatus and $this->revisionStatus
 386          * (depending what operations are attempted).
 387          *
 388          * @param array $timestamps Pass an empty array to restore all revisions,
 389          *   otherwise list the ones to undelete.
 390          * @param string $comment
 391          * @param array $fileVersions
 392          * @param bool $unsuppress
 393          * @param User $user User performing the action, or null to use $wgUser
 394          * @param string|string[] $tags Change tags to add to log entry
 395          *   ($user should be able to add the specified tags before this is called)
 396          * @return array|bool array(number of file revisions restored, number of image revisions
 397          *   restored, log message) on success, false on failure.
 398          */
 399         public function undelete( $timestamps, $comment = '', $fileVersions = [],
 400                 $unsuppress = false, User $user = null, $tags = null
 401         ) {
 402                 // If both the set of text revisions and file revisions are empty,
 403                 // restore everything. Otherwise, just restore the requested items.
 404                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 405
 406                 $restoreText = $restoreAll || !empty( $timestamps );
 407                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 408
 409                 if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 410                         $img = wfLocalFile( $this->title );
 411                         $img->load( File::READ_LATEST );
 412                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 413                         if ( !$this->fileStatus->isOK() ) {
 414                                 return false;
 415                         }
 416                         $filesRestored = $this->fileStatus->successCount;
 417                 } else {
 418                         $filesRestored = 0;
 419                 }
 420
 421                 if ( $restoreText ) {
 422                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 423                         if ( !$this->revisionStatus->isOK() ) {
 424                                 return false;
 425                         }
 426
 427                         $textRestored = $this->revisionStatus->getValue();
 428                 } else {
 429                         $textRestored = 0;
 430                 }
 431
 432                 // Touch the log!
 433
 434                 if ( !$textRestored && !$filesRestored ) {
 435                         wfDebug( "Undelete: nothing undeleted...\n" );
 436
 437                         return false;
 438                 }
 439
 440                 if ( $user === null ) {
 441                         global $wgUser;
 442                         $user = $wgUser;
 443                 }
 444
 445                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 446                 $logEntry->setPerformer( $user );
 447                 $logEntry->setTarget( $this->title );
 448                 $logEntry->setComment( $comment );
 449                 $logEntry->setTags( $tags );
 450                 $logEntry->setParameters( [
 451                         ':assoc:count' => [
 452                                 'revisions' => $textRestored,
 453                                 'files' => $filesRestored,
 454                         ],
 455                 ] );
 456
 457                 Hooks::run( 'ArticleUndeleteLogEntry', [ $this, &$logEntry, $user ] );
 458
 459                 $logid = $logEntry->insert();
 460                 $logEntry->publish( $logid );
 461
 462                 return [ $textRestored, $filesRestored, $comment ];
 463         }
 464
 465         /**
 466          * This is the meaty bit -- It restores archived revisions of the given page
 467          * to the revision table.
 468          *
 469          * @param array $timestamps Pass an empty array to restore all revisions,
 470          *   otherwise list the ones to undelete.
 471          * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
 472          * @param string $comment
 473          * @throws ReadOnlyError
 474          * @return Status Status object containing the number of revisions restored on success
 475          */
 476         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 477                 if ( wfReadOnly() ) {
 478                         throw new ReadOnlyError();
 479                 }
 480
 481                 $dbw = wfGetDB( DB_MASTER );
 482                 $dbw->startAtomic( __METHOD__ );
 483
 484                 $restoreAll = empty( $timestamps );
 485
 486                 # Does this page already exist? We'll have to update it...
 487                 $article = WikiPage::factory( $this->title );
 488                 # Load latest data for the current page (T33179)
 489                 $article->loadPageData( 'fromdbmaster' );
 490                 $oldcountable = $article->isCountable();
 491
 492                 $page = $dbw->selectRow( 'page',
 493                         [ 'page_id', 'page_latest' ],
 494                         [ 'page_namespace' => $this->title->getNamespace(),
 495                                 'page_title' => $this->title->getDBkey() ],
 496                         __METHOD__,
 497                         [ 'FOR UPDATE' ] // lock page
 498                 );
 499
 500                 if ( $page ) {
 501                         $makepage = false;
 502                         # Page already exists. Import the history, and if necessary
 503                         # we'll update the latest revision field in the record.
 504
 505                         # Get the time span of this page
 506                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 507                                 [ 'rev_id' => $page->page_latest ],
 508                                 __METHOD__ );
 509
 510                         if ( $previousTimestamp === false ) {
 511                                 wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
 512
 513                                 $status = Status::newGood( 0 );
 514                                 $status->warning( 'undeleterevision-missing' );
 515                                 $dbw->endAtomic( __METHOD__ );
 516
 517                                 return $status;
 518                         }
 519                 } else {
 520                         # Have to create a new article...
 521                         $makepage = true;
 522                         $previousTimestamp = 0;
 523                 }
 524
 525                 $oldWhere = [
 526                         'ar_namespace' => $this->title->getNamespace(),
 527                         'ar_title' => $this->title->getDBkey(),
 528                 ];
 529                 if ( !$restoreAll ) {
 530                         $oldWhere['ar_timestamp'] = array_map( [ &$dbw, 'timestamp' ], $timestamps );
 531                 }
 532
 533                 $revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
 534                 $queryInfo = $revisionStore->getArchiveQueryInfo();
 535                 $queryInfo['tables'][] = 'revision';
 536                 $queryInfo['fields'][] = 'rev_id';
 537                 $queryInfo['joins']['revision'] = [ 'LEFT JOIN', 'ar_rev_id=rev_id' ];
 538
 539                 /**
 540                  * Select each archived revision...
 541                  */
 542                 $result = $dbw->select(
 543                         $queryInfo['tables'],
 544                         $queryInfo['fields'],
 545                         $oldWhere,
 546                         __METHOD__,
 547                         /* options */
 548                         [ 'ORDER BY' => 'ar_timestamp' ],
 549                         $queryInfo['joins']
 550                 );
 551
 552                 $rev_count = $result->numRows();
 553                 if ( !$rev_count ) {
 554                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 555
 556                         $status = Status::newGood( 0 );
 557                         $status->warning( "undelete-no-results" );
 558                         $dbw->endAtomic( __METHOD__ );
 559
 560                         return $status;
 561                 }
 562
 563                 // We use ar_id because there can be duplicate ar_rev_id even for the same
 564                 // page.  In this case, we may be able to restore the first one.
 565                 $restoreFailedArIds = [];
 566
 567                 // Map rev_id to the ar_id that is allowed to use it.  When checking later,
 568                 // if it doesn't match, the current ar_id can not be restored.
 569
 570                 // Value can be an ar_id or -1 (-1 means no ar_id can use it, since the
 571                 // rev_id is taken before we even start the restore).
 572                 $allowedRevIdToArIdMap = [];
 573
 574                 $latestRestorableRow = null;
 575
 576                 foreach ( $result as $row ) {
 577                         if ( $row->ar_rev_id ) {
 578                                 // rev_id is taken even before we start restoring.
 579                                 if ( $row->ar_rev_id === $row->rev_id ) {
 580                                         $restoreFailedArIds[] = $row->ar_id;
 581                                         $allowedRevIdToArIdMap[$row->ar_rev_id] = -1;
 582                                 } else {
 583                                         // rev_id is not taken yet in the DB, but it might be taken
 584                                         // by a prior revision in the same restore operation. If
 585                                         // not, we need to reserve it.
 586                                         if ( isset( $allowedRevIdToArIdMap[$row->ar_rev_id] ) ) {
 587                                                 $restoreFailedArIds[] = $row->ar_id;
 588                                         } else {
 589                                                 $allowedRevIdToArIdMap[$row->ar_rev_id] = $row->ar_id;
 590                                                 $latestRestorableRow = $row;
 591                                         }
 592                                 }
 593                         } else {
 594                                 // If ar_rev_id is null, there can't be a collision, and a
 595                                 // rev_id will be chosen automatically.
 596                                 $latestRestorableRow = $row;
 597                         }
 598                 }
 599
 600                 $result->seek( 0 ); // move back
 601
 602                 $oldPageId = 0;
 603                 if ( $latestRestorableRow !== null ) {
 604                         $oldPageId = (int)$latestRestorableRow->ar_page_id; // pass this to ArticleUndelete hook
 605
 606                         // grab the content to check consistency with global state before restoring the page.
 607                         $revision = Revision::newFromArchiveRow( $latestRestorableRow,
 608                                 [
 609                                         'title' => $article->getTitle(), // used to derive default content model
 610                                 ]
 611                         );
 612                         $user = User::newFromName( $revision->getUserText( Revision::RAW ), false );
 613                         $content = $revision->getContent( Revision::RAW );
 614
 615                         // NOTE: article ID may not be known yet. prepareSave() should not modify the database.
 616                         $status = $content->prepareSave( $article, 0, -1, $user );
 617                         if ( !$status->isOK() ) {
 618                                 $dbw->endAtomic( __METHOD__ );
 619
 620                                 return $status;
 621                         }
 622                 }
 623
 624                 $newid = false; // newly created page ID
 625                 $restored = 0; // number of revisions restored
 626                 /** @var Revision $revision */
 627                 $revision = null;
 628                 $restoredPages = [];
 629                 // If there are no restorable revisions, we can skip most of the steps.
 630                 if ( $latestRestorableRow === null ) {
 631                         $failedRevisionCount = $rev_count;
 632                 } else {
 633                         if ( $makepage ) {
 634                                 // Check the state of the newest to-be version...
 635                                 if ( !$unsuppress
 636                                         && ( $latestRestorableRow->ar_deleted & Revision::DELETED_TEXT )
 637                                 ) {
 638                                         $dbw->endAtomic( __METHOD__ );
 639
 640                                         return Status::newFatal( "undeleterevdel" );
 641                                 }
 642                                 // Safe to insert now...
 643                                 $newid = $article->insertOn( $dbw, $latestRestorableRow->ar_page_id );
 644                                 if ( $newid === false ) {
 645                                         // The old ID is reserved; let's pick another
 646                                         $newid = $article->insertOn( $dbw );
 647                                 }
 648                                 $pageId = $newid;
 649                         } else {
 650                                 // Check if a deleted revision will become the current revision...
 651                                 if ( $latestRestorableRow->ar_timestamp > $previousTimestamp ) {
 652                                         // Check the state of the newest to-be version...
 653                                         if ( !$unsuppress
 654                                                 && ( $latestRestorableRow->ar_deleted & Revision::DELETED_TEXT )
 655                                         ) {
 656                                                 $dbw->endAtomic( __METHOD__ );
 657
 658                                                 return Status::newFatal( "undeleterevdel" );
 659                                         }
 660                                 }
 661
 662                                 $newid = false;
 663                                 $pageId = $article->getId();
 664                         }
 665
 666                         foreach ( $result as $row ) {
 667                                 // Check for key dupes due to needed archive integrity.
 668                                 if ( $row->ar_rev_id && $allowedRevIdToArIdMap[$row->ar_rev_id] !== $row->ar_id ) {
 669                                         continue;
 670                                 }
 671                                 // Insert one revision at a time...maintaining deletion status
 672                                 // unless we are specifically removing all restrictions...
 673                                 $revision = Revision::newFromArchiveRow( $row,
 674                                         [
 675                                                 'page' => $pageId,
 676                                                 'title' => $this->title,
 677                                                 'deleted' => $unsuppress ? 0 : $row->ar_deleted
 678                                         ] );
 679
 680                                 // This will also copy the revision to ip_changes if it was an IP edit.
 681                                 $revision->insertOn( $dbw );
 682
 683                                 $restored++;
 684
 685                                 Hooks::run( 'ArticleRevisionUndeleted',
 686                                         [ &$this->title, $revision, $row->ar_page_id ] );
 687                                 $restoredPages[$row->ar_page_id] = true;
 688                         }
 689
 690                         // Now that it's safely stored, take it out of the archive
 691                         // Don't delete rows that we failed to restore
 692                         $toDeleteConds = $oldWhere;
 693                         $failedRevisionCount = count( $restoreFailedArIds );
 694                         if ( $failedRevisionCount > 0 ) {
 695                                 $toDeleteConds[] = 'ar_id NOT IN ( ' . $dbw->makeList( $restoreFailedArIds ) . ' )';
 696                         }
 697
 698                         $dbw->delete( 'archive',
 699                                 $toDeleteConds,
 700                                 __METHOD__ );
 701                 }
 702
 703                 $status = Status::newGood( $restored );
 704
 705                 if ( $failedRevisionCount > 0 ) {
 706                         $status->warning(
 707                                 wfMessage( 'undeleterevision-duplicate-revid', $failedRevisionCount ) );
 708                 }
 709
 710                 // Was anything restored at all?
 711                 if ( $restored ) {
 712                         $created = (bool)$newid;
 713                         // Attach the latest revision to the page...
 714                         $wasnew = $article->updateIfNewerOn( $dbw, $revision );
 715                         if ( $created || $wasnew ) {
 716                                 // Update site stats, link tables, etc
 717                                 $article->doEditUpdates(
 718                                         $revision,
 719                                         User::newFromName( $revision->getUserText( Revision::RAW ), false ),
 720                                         [
 721                                                 'created' => $created,
 722                                                 'oldcountable' => $oldcountable,
 723                                                 'restored' => true
 724                                         ]
 725                                 );
 726                         }
 727
 728                         Hooks::run( 'ArticleUndelete',
 729                                 [ &$this->title, $created, $comment, $oldPageId, $restoredPages ] );
 730                         if ( $this->title->getNamespace() == NS_FILE ) {
 731                                 DeferredUpdates::addUpdate(
 732                                         new HTMLCacheUpdate( $this->title, 'imagelinks', 'file-restore' )
 733                                 );
 734                         }
 735                 }
 736
 737                 $dbw->endAtomic( __METHOD__ );
 738
 739                 return $status;
 740         }
 741
 742         /**
 743          * @return Status
 744          */
 745         public function getFileStatus() {
 746                 return $this->fileStatus;
 747         }
 748
 749         /**
 750          * @return Status
 751          */
 752         public function getRevisionStatus() {
 753                 return $this->revisionStatus;
 754         }
 755 }