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