includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30         /**
  31          * @var Title
  32          */
  33         protected $title;
  34
  35         /**
  36          * @var Status
  37          */
  38         protected $fileStatus;
  39
  40         /**
  41          * @var Status
  42          */
  43         protected $revisionStatus;
  44
  45         function __construct( $title ) {
  46                 if ( is_null( $title ) ) {
  47                         throw new MWException( __METHOD__ . ' given a null title.' );
  48                 }
  49                 $this->title = $title;
  50         }
  51
  52         /**
  53          * List all deleted pages recorded in the archive table. Returns result
  54          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  55          * namespace/title.
  56          *
  57          * @return ResultWrapper
  58          */
  59         public static function listAllPages() {
  60                 $dbr = wfGetDB( DB_SLAVE );
  61                 return self::listPages( $dbr, '' );
  62         }
  63
  64         /**
  65          * List deleted pages recorded in the archive table matching the
  66          * given title prefix.
  67          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  68          *
  69          * @param string $prefix Title prefix
  70          * @return ResultWrapper
  71          */
  72         public static function listPagesByPrefix( $prefix ) {
  73                 $dbr = wfGetDB( DB_SLAVE );
  74
  75                 $title = Title::newFromText( $prefix );
  76                 if ( $title ) {
  77                         $ns = $title->getNamespace();
  78                         $prefix = $title->getDBkey();
  79                 } else {
  80                         // Prolly won't work too good
  81                         // @todo handle bare namespace names cleanly?
  82                         $ns = 0;
  83                 }
  84
  85                 $conds = array(
  86                         'ar_namespace' => $ns,
  87                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  88                 );
  89
  90                 return self::listPages( $dbr, $conds );
  91         }
  92
  93         /**
  94          * @param DatabaseBase $dbr
  95          * @param string|array $condition
  96          * @return bool|ResultWrapper
  97          */
  98         protected static function listPages( $dbr, $condition ) {
  99                 return $dbr->resultObject( $dbr->select(
 100                         array( 'archive' ),
 101                         array(
 102                                 'ar_namespace',
 103                                 'ar_title',
 104                                 'count' => 'COUNT(*)'
 105                         ),
 106                         $condition,
 107                         __METHOD__,
 108                         array(
 109                                 'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 110                                 'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 111                                 'LIMIT' => 100,
 112                         )
 113                 ) );
 114         }
 115
 116         /**
 117          * List the revisions of the given page. Returns result wrapper with
 118          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 119          *
 120          * @return ResultWrapper
 121          */
 122         function listRevisions() {
 123                 global $wgContentHandlerUseDB;
 124
 125                 $dbr = wfGetDB( DB_SLAVE );
 126
 127                 $fields = array(
 128                         'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 129                         'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1',
 130                 );
 131
 132                 if ( $wgContentHandlerUseDB ) {
 133                         $fields[] = 'ar_content_format';
 134                         $fields[] = 'ar_content_model';
 135                 }
 136
 137                 $res = $dbr->select( 'archive',
 138                         $fields,
 139                         array( 'ar_namespace' => $this->title->getNamespace(),
 140                                 'ar_title' => $this->title->getDBkey() ),
 141                         __METHOD__,
 142                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 143
 144                 return $dbr->resultObject( $res );
 145         }
 146
 147         /**
 148          * List the deleted file revisions for this page, if it's a file page.
 149          * Returns a result wrapper with various filearchive fields, or null
 150          * if not a file page.
 151          *
 152          * @return ResultWrapper
 153          * @todo Does this belong in Image for fuller encapsulation?
 154          */
 155         function listFiles() {
 156                 if ( $this->title->getNamespace() != NS_FILE ) {
 157                         return null;
 158                 }
 159
 160                 $dbr = wfGetDB( DB_SLAVE );
 161                 $res = $dbr->select(
 162                         'filearchive',
 163                         ArchivedFile::selectFields(),
 164                         array( 'fa_name' => $this->title->getDBkey() ),
 165                         __METHOD__,
 166                         array( 'ORDER BY' => 'fa_timestamp DESC' )
 167                 );
 168
 169                 return $dbr->resultObject( $res );
 170         }
 171
 172         /**
 173          * Return a Revision object containing data for the deleted revision.
 174          * Note that the result *may* or *may not* have a null page ID.
 175          *
 176          * @param string $timestamp
 177          * @return Revision|null
 178          */
 179         function getRevision( $timestamp ) {
 180                 global $wgContentHandlerUseDB;
 181
 182                 $dbr = wfGetDB( DB_SLAVE );
 183
 184                 $fields = array(
 185                         'ar_rev_id',
 186                         'ar_text',
 187                         'ar_comment',
 188                         'ar_user',
 189                         'ar_user_text',
 190                         'ar_timestamp',
 191                         'ar_minor_edit',
 192                         'ar_flags',
 193                         'ar_text_id',
 194                         'ar_deleted',
 195                         'ar_len',
 196                         'ar_sha1',
 197                 );
 198
 199                 if ( $wgContentHandlerUseDB ) {
 200                         $fields[] = 'ar_content_format';
 201                         $fields[] = 'ar_content_model';
 202                 }
 203
 204                 $row = $dbr->selectRow( 'archive',
 205                         $fields,
 206                         array( 'ar_namespace' => $this->title->getNamespace(),
 207                                 'ar_title' => $this->title->getDBkey(),
 208                                 'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 209                         __METHOD__ );
 210
 211                 if ( $row ) {
 212                         return Revision::newFromArchiveRow( $row, array( 'title' => $this->title ) );
 213                 }
 214
 215                 return null;
 216         }
 217
 218         /**
 219          * Return the most-previous revision, either live or deleted, against
 220          * the deleted revision given by timestamp.
 221          *
 222          * May produce unexpected results in case of history merges or other
 223          * unusual time issues.
 224          *
 225          * @param string $timestamp
 226          * @return Revision|null Null when there is no previous revision
 227          */
 228         function getPreviousRevision( $timestamp ) {
 229                 $dbr = wfGetDB( DB_SLAVE );
 230
 231                 // Check the previous deleted revision...
 232                 $row = $dbr->selectRow( 'archive',
 233                         'ar_timestamp',
 234                         array( 'ar_namespace' => $this->title->getNamespace(),
 235                                 'ar_title' => $this->title->getDBkey(),
 236                                 'ar_timestamp < ' .
 237                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 238                         __METHOD__,
 239                         array(
 240                                 'ORDER BY' => 'ar_timestamp DESC',
 241                                 'LIMIT' => 1 ) );
 242                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 243
 244                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 245                         array( 'rev_id', 'rev_timestamp' ),
 246                         array(
 247                                 'page_namespace' => $this->title->getNamespace(),
 248                                 'page_title' => $this->title->getDBkey(),
 249                                 'page_id = rev_page',
 250                                 'rev_timestamp < ' .
 251                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 252                         __METHOD__,
 253                         array(
 254                                 'ORDER BY' => 'rev_timestamp DESC',
 255                                 'LIMIT' => 1 ) );
 256                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 257                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 258
 259                 if ( $prevLive && $prevLive > $prevDeleted ) {
 260                         // Most prior revision was live
 261                         return Revision::newFromId( $prevLiveId );
 262                 } elseif ( $prevDeleted ) {
 263                         // Most prior revision was deleted
 264                         return $this->getRevision( $prevDeleted );
 265                 }
 266
 267                 // No prior revision on this page.
 268                 return null;
 269         }
 270
 271         /**
 272          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 273          *
 274          * @param object $row Database row
 275          * @return string
 276          */
 277         function getTextFromRow( $row ) {
 278                 if ( is_null( $row->ar_text_id ) ) {
 279                         // An old row from MediaWiki 1.4 or previous.
 280                         // Text is embedded in this row in classic compression format.
 281                         return Revision::getRevisionText( $row, 'ar_' );
 282                 }
 283
 284                 // New-style: keyed to the text storage backend.
 285                 $dbr = wfGetDB( DB_SLAVE );
 286                 $text = $dbr->selectRow( 'text',
 287                         array( 'old_text', 'old_flags' ),
 288                         array( 'old_id' => $row->ar_text_id ),
 289                         __METHOD__ );
 290
 291                 return Revision::getRevisionText( $text );
 292         }
 293
 294         /**
 295          * Fetch (and decompress if necessary) the stored text of the most
 296          * recently edited deleted revision of the page.
 297          *
 298          * If there are no archived revisions for the page, returns NULL.
 299          *
 300          * @return string|null
 301          */
 302         function getLastRevisionText() {
 303                 $dbr = wfGetDB( DB_SLAVE );
 304                 $row = $dbr->selectRow( 'archive',
 305                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 306                         array( 'ar_namespace' => $this->title->getNamespace(),
 307                                 'ar_title' => $this->title->getDBkey() ),
 308                         __METHOD__,
 309                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 310
 311                 if ( $row ) {
 312                         return $this->getTextFromRow( $row );
 313                 }
 314
 315                 return null;
 316         }
 317
 318         /**
 319          * Quick check if any archived revisions are present for the page.
 320          *
 321          * @return boolean
 322          */
 323         function isDeleted() {
 324                 $dbr = wfGetDB( DB_SLAVE );
 325                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 326                         array( 'ar_namespace' => $this->title->getNamespace(),
 327                                 'ar_title' => $this->title->getDBkey() ),
 328                         __METHOD__
 329                 );
 330
 331                 return ( $n > 0 );
 332         }
 333
 334         /**
 335          * Restore the given (or all) text and file revisions for the page.
 336          * Once restored, the items will be removed from the archive tables.
 337          * The deletion log will be updated with an undeletion notice.
 338          *
 339          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 340          * @param string $comment
 341          * @param array $fileVersions
 342          * @param bool $unsuppress
 343          * @param User $user User performing the action, or null to use $wgUser
 344          *
 345          * @return array(number of file revisions restored, number of image revisions restored, log message)
 346          * on success, false on failure
 347          */
 348         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false, User $user = null ) {
 349                 // If both the set of text revisions and file revisions are empty,
 350                 // restore everything. Otherwise, just restore the requested items.
 351                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 352
 353                 $restoreText = $restoreAll || !empty( $timestamps );
 354                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 355
 356                 if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 357                         $img = wfLocalFile( $this->title );
 358                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 359                         if ( !$this->fileStatus->isOK() ) {
 360                                 return false;
 361                         }
 362                         $filesRestored = $this->fileStatus->successCount;
 363                 } else {
 364                         $filesRestored = 0;
 365                 }
 366
 367                 if ( $restoreText ) {
 368                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 369                         if ( !$this->revisionStatus->isOK() ) {
 370                                 return false;
 371                         }
 372
 373                         $textRestored = $this->revisionStatus->getValue();
 374                 } else {
 375                         $textRestored = 0;
 376                 }
 377
 378                 // Touch the log!
 379
 380                 if ( $textRestored && $filesRestored ) {
 381                         $reason = wfMessage( 'undeletedrevisions-files' )
 382                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 383                 } elseif ( $textRestored ) {
 384                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 385                                 ->inContentLanguage()->text();
 386                 } elseif ( $filesRestored ) {
 387                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 388                                 ->inContentLanguage()->text();
 389                 } else {
 390                         wfDebug( "Undelete: nothing undeleted...\n" );
 391                         return false;
 392                 }
 393
 394                 if ( trim( $comment ) != '' ) {
 395                         $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
 396                 }
 397
 398                 if ( $user === null ) {
 399                         global $wgUser;
 400                         $user = $wgUser;
 401                 }
 402
 403                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 404                 $logEntry->setPerformer( $user );
 405                 $logEntry->setTarget( $this->title );
 406                 $logEntry->setComment( $reason );
 407
 408                 wfRunHooks( 'ArticleUndeleteLogEntry', array( $this, &$logEntry, $user ) );
 409
 410                 $logid = $logEntry->insert();
 411                 $logEntry->publish( $logid );
 412
 413                 return array( $textRestored, $filesRestored, $reason );
 414         }
 415
 416         /**
 417          * This is the meaty bit -- restores archived revisions of the given page
 418          * to the cur/old tables. If the page currently exists, all revisions will
 419          * be stuffed into old, otherwise the most recent will go into cur.
 420          *
 421          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 422          * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
 423          * @param string $comment
 424          * @throws ReadOnlyError
 425          * @return Status Object containing the number of revisions restored on success
 426          */
 427         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 428                 global $wgContentHandlerUseDB;
 429
 430                 if ( wfReadOnly() ) {
 431                         throw new ReadOnlyError();
 432                 }
 433
 434                 $restoreAll = empty( $timestamps );
 435                 $dbw = wfGetDB( DB_MASTER );
 436
 437                 # Does this page already exist? We'll have to update it...
 438                 $article = WikiPage::factory( $this->title );
 439                 # Load latest data for the current page (bug 31179)
 440                 $article->loadPageData( 'fromdbmaster' );
 441                 $oldcountable = $article->isCountable();
 442
 443                 $page = $dbw->selectRow( 'page',
 444                         array( 'page_id', 'page_latest' ),
 445                         array( 'page_namespace' => $this->title->getNamespace(),
 446                                 'page_title' => $this->title->getDBkey() ),
 447                         __METHOD__,
 448                         array( 'FOR UPDATE' ) // lock page
 449                 );
 450
 451                 if ( $page ) {
 452                         $makepage = false;
 453                         # Page already exists. Import the history, and if necessary
 454                         # we'll update the latest revision field in the record.
 455
 456                         $previousRevId = $page->page_latest;
 457
 458                         # Get the time span of this page
 459                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 460                                 array( 'rev_id' => $previousRevId ),
 461                                 __METHOD__ );
 462
 463                         if ( $previousTimestamp === false ) {
 464                                 wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
 465
 466                                 $status = Status::newGood( 0 );
 467                                 $status->warning( 'undeleterevision-missing' );
 468
 469                                 return $status;
 470                         }
 471                 } else {
 472                         # Have to create a new article...
 473                         $makepage = true;
 474                         $previousRevId = 0;
 475                         $previousTimestamp = 0;
 476                 }
 477
 478                 if ( $restoreAll ) {
 479                         $oldones = '1 = 1'; # All revisions...
 480                 } else {
 481                         $oldts = implode( ',',
 482                                 array_map( array( &$dbw, 'addQuotes' ),
 483                                         array_map( array( &$dbw, 'timestamp' ),
 484                                                 $timestamps ) ) );
 485
 486                         $oldones = "ar_timestamp IN ( {$oldts} )";
 487                 }
 488
 489                 $fields = array(
 490                         'ar_rev_id',
 491                         'ar_text',
 492                         'ar_comment',
 493                         'ar_user',
 494                         'ar_user_text',
 495                         'ar_timestamp',
 496                         'ar_minor_edit',
 497                         'ar_flags',
 498                         'ar_text_id',
 499                         'ar_deleted',
 500                         'ar_page_id',
 501                         'ar_len',
 502                         'ar_sha1'
 503                 );
 504
 505                 if ( $wgContentHandlerUseDB ) {
 506                         $fields[] = 'ar_content_format';
 507                         $fields[] = 'ar_content_model';
 508                 }
 509
 510                 /**
 511                  * Select each archived revision...
 512                  */
 513                 $result = $dbw->select( 'archive',
 514                         $fields,
 515                         /* WHERE */ array(
 516                                 'ar_namespace' => $this->title->getNamespace(),
 517                                 'ar_title' => $this->title->getDBkey(),
 518                                 $oldones ),
 519                         __METHOD__,
 520                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 521                 );
 522                 $ret = $dbw->resultObject( $result );
 523                 $rev_count = $dbw->numRows( $result );
 524
 525                 if ( !$rev_count ) {
 526                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 527
 528                         $status = Status::newGood( 0 );
 529                         $status->warning( "undelete-no-results" );
 530                         return $status;
 531                 }
 532
 533                 $ret->seek( $rev_count - 1 ); // move to last
 534                 $row = $ret->fetchObject(); // get newest archived rev
 535                 $ret->seek( 0 ); // move back
 536
 537                 // grab the content to check consistency with global state before restoring the page.
 538                 $revision = Revision::newFromArchiveRow( $row,
 539                         array(
 540                                 'title' => $article->getTitle(), // used to derive default content model
 541                         )
 542                 );
 543                 $user = User::newFromName( $revision->getRawUserText(), false );
 544                 $content = $revision->getContent( Revision::RAW );
 545
 546                 //NOTE: article ID may not be known yet. prepareSave() should not modify the database.
 547                 $status = $content->prepareSave( $article, 0, -1, $user );
 548
 549                 if ( !$status->isOK() ) {
 550                         return $status;
 551                 }
 552
 553                 if ( $makepage ) {
 554                         // Check the state of the newest to-be version...
 555                         if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 556                                 return Status::newFatal( "undeleterevdel" );
 557                         }
 558                         // Safe to insert now...
 559                         $newid = $article->insertOn( $dbw );
 560                         $pageId = $newid;
 561                 } else {
 562                         // Check if a deleted revision will become the current revision...
 563                         if ( $row->ar_timestamp > $previousTimestamp ) {
 564                                 // Check the state of the newest to-be version...
 565                                 if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 566                                         return Status::newFatal( "undeleterevdel" );
 567                                 }
 568                         }
 569
 570                         $newid = false;
 571                         $pageId = $article->getId();
 572                 }
 573
 574                 $revision = null;
 575                 $restored = 0;
 576
 577                 foreach ( $ret as $row ) {
 578                         // Check for key dupes due to shitty archive integrity.
 579                         if ( $row->ar_rev_id ) {
 580                                 $exists = $dbw->selectField( 'revision', '1',
 581                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 582                                 if ( $exists ) {
 583                                         continue; // don't throw DB errors
 584                                 }
 585                         }
 586                         // Insert one revision at a time...maintaining deletion status
 587                         // unless we are specifically removing all restrictions...
 588                         $revision = Revision::newFromArchiveRow( $row,
 589                                 array(
 590                                         'page' => $pageId,
 591                                         'title' => $this->title,
 592                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 593                                 ) );
 594
 595                         $revision->insertOn( $dbw );
 596                         $restored++;
 597
 598                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 599                 }
 600                 # Now that it's safely stored, take it out of the archive
 601                 $dbw->delete( 'archive',
 602                         /* WHERE */ array(
 603                                 'ar_namespace' => $this->title->getNamespace(),
 604                                 'ar_title' => $this->title->getDBkey(),
 605                                 $oldones ),
 606                         __METHOD__ );
 607
 608                 // Was anything restored at all?
 609                 if ( $restored == 0 ) {
 610                         return Status::newGood( 0 );
 611                 }
 612
 613                 $created = (bool)$newid;
 614
 615                 // Attach the latest revision to the page...
 616                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 617                 if ( $created || $wasnew ) {
 618                         // Update site stats, link tables, etc
 619                         $user = User::newFromName( $revision->getRawUserText(), false );
 620                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 621                 }
 622
 623                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 624
 625                 if ( $this->title->getNamespace() == NS_FILE ) {
 626                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 627                         $update->doUpdate();
 628                 }
 629
 630                 return Status::newGood( $restored );
 631         }
 632
 633         /**
 634          * @return Status
 635          */
 636         function getFileStatus() {
 637                 return $this->fileStatus;
 638         }
 639
 640         /**
 641          * @return Status
 642          */
 643         function getRevisionStatus() {
 644                 return $this->revisionStatus;
 645         }
 646 }
 647
 648 /**
 649  * Special page allowing users with the appropriate permissions to view
 650  * and restore deleted content.
 651  *
 652  * @ingroup SpecialPage
 653  */
 654 class SpecialUndelete extends SpecialPage {
 655         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 656         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 657
 658         /**
 659          * @var Title
 660          */
 661         var $mTargetObj;
 662
 663         function __construct() {
 664                 parent::__construct( 'Undelete', 'deletedhistory' );
 665         }
 666
 667         function loadRequest( $par ) {
 668                 $request = $this->getRequest();
 669                 $user = $this->getUser();
 670
 671                 $this->mAction = $request->getVal( 'action' );
 672                 if ( $par !== null && $par !== '' ) {
 673                         $this->mTarget = $par;
 674                 } else {
 675                         $this->mTarget = $request->getVal( 'target' );
 676                 }
 677
 678                 $this->mTargetObj = null;
 679
 680                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 681                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 682                 }
 683
 684                 $this->mSearchPrefix = $request->getText( 'prefix' );
 685                 $time = $request->getVal( 'timestamp' );
 686                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 687                 $this->mFilename = $request->getVal( 'file' );
 688
 689                 $posted = $request->wasPosted() &&
 690                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 691                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 692                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 693                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 694                 $this->mDiff = $request->getCheck( 'diff' );
 695                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 696                 $this->mComment = $request->getText( 'wpComment' );
 697                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 698                 $this->mToken = $request->getVal( 'token' );
 699
 700                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 701                         $this->mAllowed = true; // user can restore
 702                         $this->mCanView = true; // user can view content
 703                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 704                         $this->mAllowed = false; // user cannot restore
 705                         $this->mCanView = true; // user can view content
 706                         $this->mRestore = false;
 707                 } else { // user can only view the list of revisions
 708                         $this->mAllowed = false;
 709                         $this->mCanView = false;
 710                         $this->mTimestamp = '';
 711                         $this->mRestore = false;
 712                 }
 713
 714                 if ( $this->mRestore || $this->mInvert ) {
 715                         $timestamps = array();
 716                         $this->mFileVersions = array();
 717                         foreach ( $request->getValues() as $key => $val ) {
 718                                 $matches = array();
 719                                 if ( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 720                                         array_push( $timestamps, $matches[1] );
 721                                 }
 722
 723                                 if ( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 724                                         $this->mFileVersions[] = intval( $matches[1] );
 725                                 }
 726                         }
 727                         rsort( $timestamps );
 728                         $this->mTargetTimestamp = $timestamps;
 729                 }
 730         }
 731
 732         function execute( $par ) {
 733                 $this->checkPermissions();
 734                 $user = $this->getUser();
 735
 736                 $this->setHeaders();
 737                 $this->outputHeader();
 738
 739                 $this->loadRequest( $par );
 740
 741                 $out = $this->getOutput();
 742
 743                 if ( is_null( $this->mTargetObj ) ) {
 744                         $out->addWikiMsg( 'undelete-header' );
 745
 746                         # Not all users can just browse every deleted page from the list
 747                         if ( $user->isAllowed( 'browsearchive' ) ) {
 748                                 $this->showSearchForm();
 749                         }
 750                         return;
 751                 }
 752
 753                 if ( $this->mAllowed ) {
 754                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 755                 } else {
 756                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 757                 }
 758
 759                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 760
 761                 if ( $this->mTimestamp !== '' ) {
 762                         $this->showRevision( $this->mTimestamp );
 763                 } elseif ( $this->mFilename !== null && $this->mTargetObj->inNamespace( NS_FILE ) ) {
 764                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 765                         // Check if user is allowed to see this file
 766                         if ( !$file->exists() ) {
 767                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 768                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 769                                 if ( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 770                                         throw new PermissionsError( 'suppressrevision' );
 771                                 } else {
 772                                         throw new PermissionsError( 'deletedtext' );
 773                                 }
 774                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 775                                 $this->showFileConfirmationForm( $this->mFilename );
 776                         } else {
 777                                 $this->showFile( $this->mFilename );
 778                         }
 779                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 780                         $this->undelete();
 781                 } else {
 782                         $this->showHistory();
 783                 }
 784         }
 785
 786         function showSearchForm() {
 787                 global $wgScript;
 788
 789                 $out = $this->getOutput();
 790                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 791                 $out->addHTML(
 792                         Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) ) .
 793                                 Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 794                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 795                                 Html::rawElement(
 796                                         'label',
 797                                         array( 'for' => 'prefix' ),
 798                                         $this->msg( 'undelete-search-prefix' )->parse()
 799                                 ) .
 800                                 Xml::input(
 801                                         'prefix',
 802                                         20,
 803                                         $this->mSearchPrefix,
 804                                         array( 'id' => 'prefix', 'autofocus' => true )
 805                                 ) . ' ' .
 806                                 Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 807                                 Xml::closeElement( 'fieldset' ) .
 808                                 Xml::closeElement( 'form' )
 809                 );
 810
 811                 # List undeletable articles
 812                 if ( $this->mSearchPrefix ) {
 813                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 814                         $this->showList( $result );
 815                 }
 816         }
 817
 818         /**
 819          * Generic list of deleted pages
 820          *
 821          * @param ResultWrapper $result
 822          * @return bool
 823          */
 824         private function showList( $result ) {
 825                 $out = $this->getOutput();
 826
 827                 if ( $result->numRows() == 0 ) {
 828                         $out->addWikiMsg( 'undelete-no-results' );
 829                         return false;
 830                 }
 831
 832                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 833
 834                 $undelete = $this->getTitle();
 835                 $out->addHTML( "<ul>\n" );
 836                 foreach ( $result as $row ) {
 837                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 838                         if ( $title !== null ) {
 839                                 $item = Linker::linkKnown(
 840                                         $undelete,
 841                                         htmlspecialchars( $title->getPrefixedText() ),
 842                                         array(),
 843                                         array( 'target' => $title->getPrefixedText() )
 844                                 );
 845                         } else {
 846                                 // The title is no longer valid, show as text
 847                                 $item = Html::element(
 848                                         'span',
 849                                         array( 'class' => 'mw-invalidtitle' ),
 850                                         Linker::getInvalidTitleDescription(
 851                                                 $this->getContext(),
 852                                                 $row->ar_namespace,
 853                                                 $row->ar_title
 854                                         )
 855                                 );
 856                         }
 857                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 858                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 859                 }
 860                 $result->free();
 861                 $out->addHTML( "</ul>\n" );
 862
 863                 return true;
 864         }
 865
 866         private function showRevision( $timestamp ) {
 867                 if ( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 868                         return;
 869                 }
 870
 871                 $archive = new PageArchive( $this->mTargetObj );
 872                 if ( !wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) ) ) {
 873                         return;
 874                 }
 875                 $rev = $archive->getRevision( $timestamp );
 876
 877                 $out = $this->getOutput();
 878                 $user = $this->getUser();
 879
 880                 if ( !$rev ) {
 881                         $out->addWikiMsg( 'undeleterevision-missing' );
 882                         return;
 883                 }
 884
 885                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 886                         if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 887                                 $out->wrapWikiMsg(
 888                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 889                                         'rev-deleted-text-permission'
 890                                 );
 891                                 return;
 892                         }
 893
 894                         $out->wrapWikiMsg(
 895                                 "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 896                                 'rev-deleted-text-view'
 897                         );
 898                         $out->addHTML( '<br />' );
 899                         // and we are allowed to see...
 900                 }
 901
 902                 if ( $this->mDiff ) {
 903                         $previousRev = $archive->getPreviousRevision( $timestamp );
 904                         if ( $previousRev ) {
 905                                 $this->showDiff( $previousRev, $rev );
 906                                 if ( $this->mDiffOnly ) {
 907                                         return;
 908                                 }
 909
 910                                 $out->addHTML( '<hr />' );
 911                         } else {
 912                                 $out->addWikiMsg( 'undelete-nodiff' );
 913                         }
 914                 }
 915
 916                 $link = Linker::linkKnown(
 917                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 918                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 919                 );
 920
 921                 $lang = $this->getLanguage();
 922
 923                 // date and time are separate parameters to facilitate localisation.
 924                 // $time is kept for backward compat reasons.
 925                 $time = $lang->userTimeAndDate( $timestamp, $user );
 926                 $d = $lang->userDate( $timestamp, $user );
 927                 $t = $lang->userTime( $timestamp, $user );
 928                 $userLink = Linker::revUserTools( $rev );
 929
 930                 $content = $rev->getContent( Revision::FOR_THIS_USER, $user );
 931
 932                 $isText = ( $content instanceof TextContent );
 933
 934                 if ( $this->mPreview || $isText ) {
 935                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 936                 } else {
 937                         $openDiv = '<div id="mw-undelete-revision">';
 938                 }
 939                 $out->addHTML( $openDiv );
 940
 941                 // Revision delete links
 942                 if ( !$this->mDiff ) {
 943                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 944                         if ( $revdel ) {
 945                                 $out->addHTML( "$revdel " );
 946                         }
 947                 }
 948
 949                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 950                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 951
 952                 if ( !wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) ) ) {
 953                         return;
 954                 }
 955
 956                 if ( $this->mPreview || !$isText ) {
 957                         // NOTE: non-text content has no source view, so always use rendered preview
 958
 959                         // Hide [edit]s
 960                         $popts = $out->parserOptions();
 961                         $popts->setEditSection( false );
 962
 963                         $pout = $content->getParserOutput( $this->mTargetObj, $rev->getId(), $popts, true );
 964                         $out->addParserOutput( $pout );
 965                 }
 966
 967                 if ( $isText ) {
 968                         // source view for textual content
 969                         $sourceView = Xml::element(
 970                                 'textarea',
 971                                 array(
 972                                         'readonly' => 'readonly',
 973                                         'cols' => $user->getIntOption( 'cols' ),
 974                                         'rows' => $user->getIntOption( 'rows' )
 975                                 ),
 976                                 $content->getNativeData() . "\n"
 977                         );
 978
 979                         $previewButton = Xml::element( 'input', array(
 980                                 'type' => 'submit',
 981                                 'name' => 'preview',
 982                                 'value' => $this->msg( 'showpreview' )->text()
 983                         ) );
 984                 } else {
 985                         $sourceView = '';
 986                         $previewButton = '';
 987                 }
 988
 989                 $diffButton = Xml::element( 'input', array(
 990                         'name' => 'diff',
 991                         'type' => 'submit',
 992                         'value' => $this->msg( 'showdiff' )->text() ) );
 993
 994                 $out->addHTML(
 995                         $sourceView .
 996                                 Xml::openElement( 'div', array(
 997                                         'style' => 'clear: both' ) ) .
 998                                 Xml::openElement( 'form', array(
 999                                         'method' => 'post',
1000                                         'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
1001                                 Xml::element( 'input', array(
1002                                         'type' => 'hidden',
1003                                         'name' => 'target',
1004                                         'value' => $this->mTargetObj->getPrefixedDBkey() ) ) .
1005                                 Xml::element( 'input', array(
1006                                         'type' => 'hidden',
1007                                         'name' => 'timestamp',
1008                                         'value' => $timestamp ) ) .
1009                                 Xml::element( 'input', array(
1010                                         'type' => 'hidden',
1011                                         'name' => 'wpEditToken',
1012                                         'value' => $user->getEditToken() ) ) .
1013                                 $previewButton .
1014                                 $diffButton .
1015                                 Xml::closeElement( 'form' ) .
1016                                 Xml::closeElement( 'div' )
1017                 );
1018         }
1019
1020         /**
1021          * Build a diff display between this and the previous either deleted
1022          * or non-deleted edit.
1023          *
1024          * @param Revision $previousRev
1025          * @param Revision $currentRev
1026          * @return string HTML
1027          */
1028         function showDiff( $previousRev, $currentRev ) {
1029                 $diffContext = clone $this->getContext();
1030                 $diffContext->setTitle( $currentRev->getTitle() );
1031                 $diffContext->setWikiPage( WikiPage::factory( $currentRev->getTitle() ) );
1032
1033                 $diffEngine = $currentRev->getContentHandler()->createDifferenceEngine( $diffContext );
1034                 $diffEngine->showDiffStyle();
1035                 $this->getOutput()->addHTML( "<div>" .
1036                         "<table style='width: 98%;' cellpadding='0' cellspacing='4' class='diff'>" .
1037                         "<col class='diff-marker' />" .
1038                         "<col class='diff-content' />" .
1039                         "<col class='diff-marker' />" .
1040                         "<col class='diff-content' />" .
1041                         "<tr>" .
1042                         "<td colspan='2' style='width: 50%; text-align: center' class='diff-otitle'>" .
1043                         $this->diffHeader( $previousRev, 'o' ) .
1044                         "</td>\n" .
1045                         "<td colspan='2' style='width: 50%;  text-align: center' class='diff-ntitle'>" .
1046                         $this->diffHeader( $currentRev, 'n' ) .
1047                         "</td>\n" .
1048                         "</tr>" .
1049                         $diffEngine->generateContentDiffBody(
1050                                 $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
1051                                 $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ) ) .
1052                         "</table>" .
1053                         "</div>\n"
1054                 );
1055         }
1056
1057         /**
1058          * @param Revision $rev
1059          * @param string $prefix
1060          * @return string
1061          */
1062         private function diffHeader( $rev, $prefix ) {
1063                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
1064                 if ( $isDeleted ) {
1065                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
1066                         $targetPage = $this->getTitle();
1067                         $targetQuery = array(
1068                                 'target' => $this->mTargetObj->getPrefixedText(),
1069                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
1070                         );
1071                 } else {
1072                         /// @todo FIXME: getId() may return non-zero for deleted revs...
1073                         $targetPage = $rev->getTitle();
1074                         $targetQuery = array( 'oldid' => $rev->getId() );
1075                 }
1076
1077                 // Add show/hide deletion links if available
1078                 $user = $this->getUser();
1079                 $lang = $this->getLanguage();
1080                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1081
1082                 if ( $rdel ) {
1083                         $rdel = " $rdel";
1084                 }
1085
1086                 return '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1087                         Linker::link(
1088                                 $targetPage,
1089                                 $this->msg(
1090                                         'revisionasof',
1091                                         $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
1092                                         $lang->userDate( $rev->getTimestamp(), $user ),
1093                                         $lang->userTime( $rev->getTimestamp(), $user )
1094                                 )->escaped(),
1095                                 array(),
1096                                 $targetQuery
1097                         ) .
1098                         '</strong></div>' .
1099                         '<div id="mw-diff-' . $prefix . 'title2">' .
1100                         Linker::revUserTools( $rev ) . '<br />' .
1101                         '</div>' .
1102                         '<div id="mw-diff-' . $prefix . 'title3">' .
1103                         Linker::revComment( $rev ) . $rdel . '<br />' .
1104                         '</div>';
1105         }
1106
1107         /**
1108          * Show a form confirming whether a tokenless user really wants to see a file
1109          */
1110         private function showFileConfirmationForm( $key ) {
1111                 $out = $this->getOutput();
1112                 $lang = $this->getLanguage();
1113                 $user = $this->getUser();
1114                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1115                 $out->addWikiMsg( 'undelete-show-file-confirm',
1116                         $this->mTargetObj->getText(),
1117                         $lang->userDate( $file->getTimestamp(), $user ),
1118                         $lang->userTime( $file->getTimestamp(), $user ) );
1119                 $out->addHTML(
1120                         Xml::openElement( 'form', array(
1121                                         'method' => 'POST',
1122                                         'action' => $this->getTitle()->getLocalURL( array(
1123                                                 'target' => $this->mTarget,
1124                                                 'file' => $key,
1125                                                 'token' => $user->getEditToken( $key ),
1126                                         ) ),
1127                                 )
1128                         ) .
1129                                 Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1130                                 '</form>'
1131                 );
1132         }
1133
1134         /**
1135          * Show a deleted file version requested by the visitor.
1136          */
1137         private function showFile( $key ) {
1138                 $this->getOutput()->disable();
1139
1140                 # We mustn't allow the output to be Squid cached, otherwise
1141                 # if an admin previews a deleted image, and it's cached, then
1142                 # a user without appropriate permissions can toddle off and
1143                 # nab the image, and Squid will serve it
1144                 $response = $this->getRequest()->response();
1145                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1146                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1147                 $response->header( 'Pragma: no-cache' );
1148
1149                 $repo = RepoGroup::singleton()->getLocalRepo();
1150                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1151                 $repo->streamFile( $path );
1152         }
1153
1154         private function showHistory() {
1155                 $out = $this->getOutput();
1156                 if ( $this->mAllowed ) {
1157                         $out->addModules( 'mediawiki.special.undelete' );
1158                 }
1159                 $out->wrapWikiMsg(
1160                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1161                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1162                 );
1163
1164                 $archive = new PageArchive( $this->mTargetObj );
1165                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1166                 /*
1167                 $text = $archive->getLastRevisionText();
1168                 if( is_null( $text ) ) {
1169                         $out->addWikiMsg( 'nohistory' );
1170                         return;
1171                 }
1172                 */
1173                 $out->addHTML( '<div class="mw-undelete-history">' );
1174                 if ( $this->mAllowed ) {
1175                         $out->addWikiMsg( 'undeletehistory' );
1176                         $out->addWikiMsg( 'undeleterevdel' );
1177                 } else {
1178                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1179                 }
1180                 $out->addHTML( '</div>' );
1181
1182                 # List all stored revisions
1183                 $revisions = $archive->listRevisions();
1184                 $files = $archive->listFiles();
1185
1186                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1187                 $haveFiles = $files && $files->numRows() > 0;
1188
1189                 # Batch existence check on user and talk pages
1190                 if ( $haveRevisions ) {
1191                         $batch = new LinkBatch();
1192                         foreach ( $revisions as $row ) {
1193                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1194                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1195                         }
1196                         $batch->execute();
1197                         $revisions->seek( 0 );
1198                 }
1199                 if ( $haveFiles ) {
1200                         $batch = new LinkBatch();
1201                         foreach ( $files as $row ) {
1202                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1203                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1204                         }
1205                         $batch->execute();
1206                         $files->seek( 0 );
1207                 }
1208
1209                 if ( $this->mAllowed ) {
1210                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1211                         # Start the form here
1212                         $top = Xml::openElement(
1213                                 'form',
1214                                 array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' )
1215                         );
1216                         $out->addHTML( $top );
1217                 }
1218
1219                 # Show relevant lines from the deletion log:
1220                 $deleteLogPage = new LogPage( 'delete' );
1221                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1222                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1223                 # Show relevant lines from the suppression log:
1224                 $suppressLogPage = new LogPage( 'suppress' );
1225                 if ( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1226                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1227                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1228                 }
1229
1230                 if ( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1231                         # Format the user-visible controls (comment field, submission button)
1232                         # in a nice little table
1233                         if ( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1234                                 $unsuppressBox =
1235                                         "<tr>
1236                                                 <td>&#160;</td>
1237                                                 <td class='mw-input'>" .
1238                                                 Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1239                                                         'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ) .
1240                                                 "</td>
1241                                         </tr>";
1242                         } else {
1243                                 $unsuppressBox = '';
1244                         }
1245
1246                         $table =
1247                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1248                                         Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1249                                         "<tr>
1250                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1251                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1252                                         "</td>
1253                                 </tr>
1254                                 <tr>
1255                                         <td class='mw-label'>" .
1256                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1257                                         "</td>
1258                                         <td class='mw-input'>" .
1259                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment', 'autofocus' => true ) ) .
1260                                         "</td>
1261                                 </tr>
1262                                 <tr>
1263                                         <td>&#160;</td>
1264                                         <td class='mw-submit'>" .
1265                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1266                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1267                                         "</td>
1268                                 </tr>" .
1269                                         $unsuppressBox .
1270                                         Xml::closeElement( 'table' ) .
1271                                         Xml::closeElement( 'fieldset' );
1272
1273                         $out->addHTML( $table );
1274                 }
1275
1276                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1277
1278                 if ( $haveRevisions ) {
1279                         # The page's stored (deleted) history:
1280                         $out->addHTML( '<ul>' );
1281                         $remaining = $revisions->numRows();
1282                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1283
1284                         foreach ( $revisions as $row ) {
1285                                 $remaining--;
1286                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1287                         }
1288                         $revisions->free();
1289                         $out->addHTML( '</ul>' );
1290                 } else {
1291                         $out->addWikiMsg( 'nohistory' );
1292                 }
1293
1294                 if ( $haveFiles ) {
1295                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1296                         $out->addHTML( '<ul>' );
1297                         foreach ( $files as $row ) {
1298                                 $out->addHTML( $this->formatFileRow( $row ) );
1299                         }
1300                         $files->free();
1301                         $out->addHTML( '</ul>' );
1302                 }
1303
1304                 if ( $this->mAllowed ) {
1305                         # Slip in the hidden controls here
1306                         $misc = Html::hidden( 'target', $this->mTarget );
1307                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1308                         $misc .= Xml::closeElement( 'form' );
1309                         $out->addHTML( $misc );
1310                 }
1311
1312                 return true;
1313         }
1314
1315         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1316                 $rev = Revision::newFromArchiveRow( $row,
1317                         array(
1318                                 'title' => $this->mTargetObj
1319                         ) );
1320
1321                 $revTextSize = '';
1322                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1323                 // Build checkboxen...
1324                 if ( $this->mAllowed ) {
1325                         if ( $this->mInvert ) {
1326                                 if ( in_array( $ts, $this->mTargetTimestamp ) ) {
1327                                         $checkBox = Xml::check( "ts$ts" );
1328                                 } else {
1329                                         $checkBox = Xml::check( "ts$ts", true );
1330                                 }
1331                         } else {
1332                                 $checkBox = Xml::check( "ts$ts" );
1333                         }
1334                 } else {
1335                         $checkBox = '';
1336                 }
1337
1338                 // Build page & diff links...
1339                 $user = $this->getUser();
1340                 if ( $this->mCanView ) {
1341                         $titleObj = $this->getTitle();
1342                         # Last link
1343                         if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1344                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1345                                 $last = $this->msg( 'diff' )->escaped();
1346                         } elseif ( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1347                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1348                                 $last = Linker::linkKnown(
1349                                         $titleObj,
1350                                         $this->msg( 'diff' )->escaped(),
1351                                         array(),
1352                                         array(
1353                                                 'target' => $this->mTargetObj->getPrefixedText(),
1354                                                 'timestamp' => $ts,
1355                                                 'diff' => 'prev'
1356                                         )
1357                                 );
1358                         } else {
1359                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1360                                 $last = $this->msg( 'diff' )->escaped();
1361                         }
1362                 } else {
1363                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1364                         $last = $this->msg( 'diff' )->escaped();
1365                 }
1366
1367                 // User links
1368                 $userLink = Linker::revUserTools( $rev );
1369
1370                 // Revision text size
1371                 $size = $row->ar_len;
1372                 if ( !is_null( $size ) ) {
1373                         $revTextSize = Linker::formatRevisionSize( $size );
1374                 }
1375
1376                 // Edit summary
1377                 $comment = Linker::revComment( $rev );
1378
1379                 // Revision delete links
1380                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1381
1382                 $revisionRow = $this->msg( 'undelete-revisionrow' )
1383                         ->rawParams( $checkBox, $revdlink, $last, $pageLink, $userLink, $revTextSize, $comment )
1384                         ->escaped();
1385
1386                 return "<li>$revisionRow</li>";
1387         }
1388
1389         private function formatFileRow( $row ) {
1390                 $file = ArchivedFile::newFromRow( $row );
1391                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1392                 $user = $this->getUser();
1393
1394                 if ( $this->mAllowed && $row->fa_storage_key ) {
1395                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1396                         $key = urlencode( $row->fa_storage_key );
1397                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1398                 } else {
1399                         $checkBox = '';
1400                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1401                 }
1402                 $userLink = $this->getFileUser( $file );
1403                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1404                 $bytes = $this->msg( 'parentheses' )
1405                         ->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )
1406                         ->plain();
1407                 $data = htmlspecialchars( $data . ' ' . $bytes );
1408                 $comment = $this->getFileComment( $file );
1409
1410                 // Add show/hide deletion links if available
1411                 $canHide = $user->isAllowed( 'deleterevision' );
1412                 if ( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1413                         if ( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1414                                 // Revision was hidden from sysops
1415                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide );
1416                         } else {
1417                                 $query = array(
1418                                         'type' => 'filearchive',
1419                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1420                                         'ids' => $row->fa_id
1421                                 );
1422                                 $revdlink = Linker::revDeleteLink( $query,
1423                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1424                         }
1425                 } else {
1426                         $revdlink = '';
1427                 }
1428
1429                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1430         }
1431
1432         /**
1433          * Fetch revision text link if it's available to all users
1434          *
1435          * @param Revision $rev
1436          * @param Title $titleObj
1437          * @param string $ts Timestamp
1438          * @return string
1439          */
1440         function getPageLink( $rev, $titleObj, $ts ) {
1441                 $user = $this->getUser();
1442                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1443
1444                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1445                         return '<span class="history-deleted">' . $time . '</span>';
1446                 }
1447
1448                 $link = Linker::linkKnown(
1449                         $titleObj,
1450                         htmlspecialchars( $time ),
1451                         array(),
1452                         array(
1453                                 'target' => $this->mTargetObj->getPrefixedText(),
1454                                 'timestamp' => $ts
1455                         )
1456                 );
1457
1458                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1459                         $link = '<span class="history-deleted">' . $link . '</span>';
1460                 }
1461
1462                 return $link;
1463         }
1464
1465         /**
1466          * Fetch image view link if it's available to all users
1467          *
1468          * @param File|ArchivedFile $file
1469          * @param Title $titleObj
1470          * @param string $ts A timestamp
1471          * @param string $key a storage key
1472          *
1473          * @return string HTML fragment
1474          */
1475         function getFileLink( $file, $titleObj, $ts, $key ) {
1476                 $user = $this->getUser();
1477                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1478
1479                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1480                         return '<span class="history-deleted">' . $time . '</span>';
1481                 }
1482
1483                 $link = Linker::linkKnown(
1484                         $titleObj,
1485                         htmlspecialchars( $time ),
1486                         array(),
1487                         array(
1488                                 'target' => $this->mTargetObj->getPrefixedText(),
1489                                 'file' => $key,
1490                                 'token' => $user->getEditToken( $key )
1491                         )
1492                 );
1493
1494                 if ( $file->isDeleted( File::DELETED_FILE ) ) {
1495                         $link = '<span class="history-deleted">' . $link . '</span>';
1496                 }
1497
1498                 return $link;
1499         }
1500
1501         /**
1502          * Fetch file's user id if it's available to this user
1503          *
1504          * @param File|ArchivedFile $file
1505          * @return string HTML fragment
1506          */
1507         function getFileUser( $file ) {
1508                 if ( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1509                         return '<span class="history-deleted">' .
1510                                 $this->msg( 'rev-deleted-user' )->escaped() .
1511                                 '</span>';
1512                 }
1513
1514                 $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1515                         Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1516
1517                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1518                         $link = '<span class="history-deleted">' . $link . '</span>';
1519                 }
1520
1521                 return $link;
1522         }
1523
1524         /**
1525          * Fetch file upload comment if it's available to this user
1526          *
1527          * @param File|ArchivedFile $file
1528          * @return string HTML fragment
1529          */
1530         function getFileComment( $file ) {
1531                 if ( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1532                         return '<span class="history-deleted"><span class="comment">' .
1533                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1534                 }
1535
1536                 $link = Linker::commentBlock( $file->getRawDescription() );
1537
1538                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1539                         $link = '<span class="history-deleted">' . $link . '</span>';
1540                 }
1541
1542                 return $link;
1543         }
1544
1545         function undelete() {
1546                 global $wgUploadMaintenance;
1547
1548                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1549                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1550                 }
1551
1552                 if ( wfReadOnly() ) {
1553                         throw new ReadOnlyError;
1554                 }
1555
1556                 $out = $this->getOutput();
1557                 $archive = new PageArchive( $this->mTargetObj );
1558                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1559                 $ok = $archive->undelete(
1560                         $this->mTargetTimestamp,
1561                         $this->mComment,
1562                         $this->mFileVersions,
1563                         $this->mUnsuppress,
1564                         $this->getUser()
1565                 );
1566
1567                 if ( is_array( $ok ) ) {
1568                         if ( $ok[1] ) { // Undeleted file count
1569                                 wfRunHooks( 'FileUndeleteComplete', array(
1570                                         $this->mTargetObj, $this->mFileVersions,
1571                                         $this->getUser(), $this->mComment ) );
1572                         }
1573
1574                         $link = Linker::linkKnown( $this->mTargetObj );
1575                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1576                 } else {
1577                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1578                 }
1579
1580                 // Show revision undeletion warnings and errors
1581                 $status = $archive->getRevisionStatus();
1582                 if ( $status && !$status->isGood() ) {
1583                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'cannotundelete', 'cannotundelete' ) . '</div>' );
1584                 }
1585
1586                 // Show file undeletion warnings and errors
1587                 $status = $archive->getFileStatus();
1588                 if ( $status && !$status->isGood() ) {
1589                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1590                 }
1591         }
1592
1593         protected function getGroupName() {
1594                 return 'pagetools';
1595         }
1596 }