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