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(*) AS 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          *
 345          * @return array(number of file revisions restored, number of image revisions restored, log message)
 346          * on success, false on failure
 347          */
 348         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 349                 // If both the set of text revisions and file revisions are empty,
 350                 // restore everything. Otherwise, just restore the requested items.
 351                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 352
 353                 $restoreText = $restoreAll || !empty( $timestamps );
 354                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 355
 356                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 357                         $img = wfLocalFile( $this->title );
 358                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 359                         if ( !$this->fileStatus->isOk() ) {
 360                                 return false;
 361                         }
 362                         $filesRestored = $this->fileStatus->successCount;
 363                 } else {
 364                         $filesRestored = 0;
 365                 }
 366
 367                 if( $restoreText ) {
 368                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 369                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 370                                 return false;
 371                         }
 372                 } else {
 373                         $textRestored = 0;
 374                 }
 375
 376                 // Touch the log!
 377                 global $wgContLang;
 378                 $log = new LogPage( 'delete' );
 379
 380                 if( $textRestored && $filesRestored ) {
 381                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 382                                 $wgContLang->formatNum( $textRestored ),
 383                                 $wgContLang->formatNum( $filesRestored ) );
 384                 } elseif( $textRestored ) {
 385                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 386                                 $wgContLang->formatNum( $textRestored ) );
 387                 } elseif( $filesRestored ) {
 388                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 389                                 $wgContLang->formatNum( $filesRestored ) );
 390                 } else {
 391                         wfDebug( "Undelete: nothing undeleted...\n" );
 392                         return false;
 393                 }
 394
 395                 if( trim( $comment ) != '' ) {
 396                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 397                 }
 398                 $log->addEntry( 'restore', $this->title, $reason );
 399
 400                 return array( $textRestored, $filesRestored, $reason );
 401         }
 402
 403         /**
 404          * This is the meaty bit -- restores archived revisions of the given page
 405          * to the cur/old tables. If the page currently exists, all revisions will
 406          * be stuffed into old, otherwise the most recent will go into cur.
 407          *
 408          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 409          * @param $comment String
 410          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 411          *
 412          * @return Mixed: number of revisions restored or false on failure
 413          */
 414         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 415                 global $wgContentHandlerNoDB;
 416
 417                 if ( wfReadOnly() ) {
 418                         return false;
 419                 }
 420                 $restoreAll = empty( $timestamps );
 421
 422                 $dbw = wfGetDB( DB_MASTER );
 423
 424                 # Does this page already exist? We'll have to update it...
 425                 $article = WikiPage::factory( $this->title );
 426                 # Load latest data for the current page (bug 31179)
 427                 $article->loadPageData( 'fromdbmaster' );
 428                 $oldcountable = $article->isCountable();
 429
 430                 $page = $dbw->selectRow( 'page',
 431                         array( 'page_id', 'page_latest' ),
 432                         array( 'page_namespace' => $this->title->getNamespace(),
 433                                    'page_title'     => $this->title->getDBkey() ),
 434                         __METHOD__,
 435                         array( 'FOR UPDATE' ) // lock page
 436                 );
 437                 if( $page ) {
 438                         $makepage = false;
 439                         # Page already exists. Import the history, and if necessary
 440                         # we'll update the latest revision field in the record.
 441                         $newid             = 0;
 442                         $pageId            = $page->page_id;
 443                         $previousRevId    = $page->page_latest;
 444                         # Get the time span of this page
 445                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 446                                 array( 'rev_id' => $previousRevId ),
 447                                 __METHOD__ );
 448                         if( $previousTimestamp === false ) {
 449                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 450                                 return 0;
 451                         }
 452                 } else {
 453                         # Have to create a new article...
 454                         $makepage = true;
 455                         $previousRevId = 0;
 456                         $previousTimestamp = 0;
 457                 }
 458
 459                 if( $restoreAll ) {
 460                         $oldones = '1 = 1'; # All revisions...
 461                 } else {
 462                         $oldts = implode( ',',
 463                                 array_map( array( &$dbw, 'addQuotes' ),
 464                                         array_map( array( &$dbw, 'timestamp' ),
 465                                                 $timestamps ) ) );
 466
 467                         $oldones = "ar_timestamp IN ( {$oldts} )";
 468                 }
 469
 470                 $fields = array(
 471                         'ar_rev_id',
 472                         'ar_text',
 473                         'ar_comment',
 474                         'ar_user',
 475                         'ar_user_text',
 476                         'ar_timestamp',
 477                         'ar_minor_edit',
 478                         'ar_flags',
 479                         'ar_text_id',
 480                         'ar_deleted',
 481                         'ar_page_id',
 482                         'ar_len',
 483                         'ar_sha1');
 484
 485                 if ( !$wgContentHandlerNoDB ) {
 486                         $fields[] = 'ar_content_format';
 487                         $fields[] = 'ar_content_model';
 488                 }
 489
 490                 /**
 491                  * Select each archived revision...
 492                  */
 493                 $result = $dbw->select( 'archive',
 494                         $fields,
 495                         /* WHERE */ array(
 496                                 'ar_namespace' => $this->title->getNamespace(),
 497                                 'ar_title'     => $this->title->getDBkey(),
 498                                 $oldones ),
 499                         __METHOD__,
 500                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 501                 );
 502                 $ret = $dbw->resultObject( $result );
 503                 $rev_count = $dbw->numRows( $result );
 504                 if( !$rev_count ) {
 505                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 506                         return false; // ???
 507                 }
 508
 509                 $ret->seek( $rev_count - 1 ); // move to last
 510                 $row = $ret->fetchObject(); // get newest archived rev
 511                 $ret->seek( 0 ); // move back
 512
 513                 if( $makepage ) {
 514                         // Check the state of the newest to-be version...
 515                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 516                                 return false; // we can't leave the current revision like this!
 517                         }
 518                         // Safe to insert now...
 519                         $newid  = $article->insertOn( $dbw );
 520                         $pageId = $newid;
 521                 } else {
 522                         // Check if a deleted revision will become the current revision...
 523                         if( $row->ar_timestamp > $previousTimestamp ) {
 524                                 // Check the state of the newest to-be version...
 525                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 526                                         return false; // we can't leave the current revision like this!
 527                                 }
 528                         }
 529                 }
 530
 531                 $revision = null;
 532                 $restored = 0;
 533
 534                 foreach ( $ret as $row ) {
 535                         // Check for key dupes due to shitty archive integrity.
 536                         if( $row->ar_rev_id ) {
 537                                 $exists = $dbw->selectField( 'revision', '1',
 538                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 539                                 if( $exists ) {
 540                                         continue; // don't throw DB errors
 541                                 }
 542                         }
 543                         // Insert one revision at a time...maintaining deletion status
 544                         // unless we are specifically removing all restrictions...
 545                         $revision = Revision::newFromArchiveRow( $row,
 546                                 array(
 547                                         'page' => $pageId,
 548                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 549                                 ) );
 550
 551                         $revision->insertOn( $dbw );
 552                         $restored++;
 553
 554                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 555                 }
 556                 # Now that it's safely stored, take it out of the archive
 557                 $dbw->delete( 'archive',
 558                         /* WHERE */ array(
 559                                 'ar_namespace' => $this->title->getNamespace(),
 560                                 'ar_title' => $this->title->getDBkey(),
 561                                 $oldones ),
 562                         __METHOD__ );
 563
 564                 // Was anything restored at all?
 565                 if ( $restored == 0 ) {
 566                         return 0;
 567                 }
 568
 569                 $created = (bool)$newid;
 570
 571                 // Attach the latest revision to the page...
 572                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 573                 if ( $created || $wasnew ) {
 574                         // Update site stats, link tables, etc
 575                         $user = User::newFromName( $revision->getRawUserText(), false );
 576                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 577                 }
 578
 579                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 580
 581                 if( $this->title->getNamespace() == NS_FILE ) {
 582                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 583                         $update->doUpdate();
 584                 }
 585
 586                 return $restored;
 587         }
 588
 589         /**
 590          * @return Status
 591          */
 592         function getFileStatus() { return $this->fileStatus; }
 593 }
 594
 595 /**
 596  * Special page allowing users with the appropriate permissions to view
 597  * and restore deleted content.
 598  *
 599  * @ingroup SpecialPage
 600  */
 601 class SpecialUndelete extends SpecialPage {
 602         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 603         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 604
 605         /**
 606          * @var Title
 607          */
 608         var $mTargetObj;
 609
 610         function __construct() {
 611                 parent::__construct( 'Undelete', 'deletedhistory' );
 612         }
 613
 614         function loadRequest( $par ) {
 615                 $request = $this->getRequest();
 616                 $user = $this->getUser();
 617
 618                 $this->mAction = $request->getVal( 'action' );
 619                 if ( $par !== null && $par !== '' ) {
 620                         $this->mTarget = $par;
 621                 } else {
 622                         $this->mTarget = $request->getVal( 'target' );
 623                 }
 624                 $this->mTargetObj = null;
 625                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 626                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 627                 }
 628                 $this->mSearchPrefix = $request->getText( 'prefix' );
 629                 $time = $request->getVal( 'timestamp' );
 630                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 631                 $this->mFilename = $request->getVal( 'file' );
 632
 633                 $posted = $request->wasPosted() &&
 634                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 635                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 636                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 637                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 638                 $this->mDiff = $request->getCheck( 'diff' );
 639                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 640                 $this->mComment = $request->getText( 'wpComment' );
 641                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 642                 $this->mToken = $request->getVal( 'token' );
 643
 644                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 645                         $this->mAllowed = true; // user can restore
 646                         $this->mCanView = true; // user can view content
 647                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 648                         $this->mAllowed = false; // user cannot restore
 649                         $this->mCanView = true; // user can view content
 650                         $this->mRestore = false;
 651                 } else { // user can only view the list of revisions
 652                         $this->mAllowed = false;
 653                         $this->mCanView = false;
 654                         $this->mTimestamp = '';
 655                         $this->mRestore = false;
 656                 }
 657
 658                 if( $this->mRestore || $this->mInvert ) {
 659                         $timestamps = array();
 660                         $this->mFileVersions = array();
 661                         foreach( $request->getValues() as $key => $val ) {
 662                                 $matches = array();
 663                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 664                                         array_push( $timestamps, $matches[1] );
 665                                 }
 666
 667                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 668                                         $this->mFileVersions[] = intval( $matches[1] );
 669                                 }
 670                         }
 671                         rsort( $timestamps );
 672                         $this->mTargetTimestamp = $timestamps;
 673                 }
 674         }
 675
 676         function execute( $par ) {
 677                 $this->checkPermissions();
 678                 $user = $this->getUser();
 679
 680                 $this->setHeaders();
 681                 $this->outputHeader();
 682
 683                 $this->loadRequest( $par );
 684
 685                 $out = $this->getOutput();
 686
 687                 if ( is_null( $this->mTargetObj ) ) {
 688                         $out->addWikiMsg( 'undelete-header' );
 689
 690                         # Not all users can just browse every deleted page from the list
 691                         if ( $user->isAllowed( 'browsearchive' ) ) {
 692                                 $this->showSearchForm();
 693                         }
 694                         return;
 695                 }
 696
 697                 if ( $this->mAllowed ) {
 698                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 699                 } else {
 700                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 701                 }
 702
 703                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 704
 705                 if ( $this->mTimestamp !== '' ) {
 706                         $this->showRevision( $this->mTimestamp );
 707                 } elseif ( $this->mFilename !== null ) {
 708                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 709                         // Check if user is allowed to see this file
 710                         if ( !$file->exists() ) {
 711                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 712                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 713                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 714                                         throw new PermissionsError( 'suppressrevision' );
 715                                 } else {
 716                                         throw new PermissionsError( 'deletedtext' );
 717                                 }
 718                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 719                                 $this->showFileConfirmationForm( $this->mFilename );
 720                         } else {
 721                                 $this->showFile( $this->mFilename );
 722                         }
 723                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 724                         $this->undelete();
 725                 } else {
 726                         $this->showHistory();
 727                 }
 728         }
 729
 730         function showSearchForm() {
 731                 global $wgScript;
 732
 733                 $out = $this->getOutput();
 734                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 735                 $out->addHTML(
 736                         Xml::openElement( 'form', array(
 737                                 'method' => 'get',
 738                                 'action' => $wgScript ) ) .
 739                         Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 740                         Html::hidden( 'title',
 741                                 $this->getTitle()->getPrefixedDbKey() ) .
 742                         Xml::inputLabel( $this->msg( 'undelete-search-prefix' )->text(),
 743                                 'prefix', 'prefix', 20,
 744                                 $this->mSearchPrefix ) . ' ' .
 745                         Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 746                         Xml::closeElement( 'fieldset' ) .
 747                         Xml::closeElement( 'form' )
 748                 );
 749
 750                 # List undeletable articles
 751                 if( $this->mSearchPrefix ) {
 752                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 753                         $this->showList( $result );
 754                 }
 755         }
 756
 757         /**
 758          * Generic list of deleted pages
 759          *
 760          * @param $result ResultWrapper
 761          * @return bool
 762          */
 763         private function showList( $result ) {
 764                 $out = $this->getOutput();
 765
 766                 if( $result->numRows() == 0 ) {
 767                         $out->addWikiMsg( 'undelete-no-results' );
 768                         return;
 769                 }
 770
 771                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 772
 773                 $undelete = $this->getTitle();
 774                 $out->addHTML( "<ul>\n" );
 775                 foreach ( $result as $row ) {
 776                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 777                         if ( $title !== null ) {
 778                                 $item = Linker::linkKnown(
 779                                         $undelete,
 780                                         htmlspecialchars( $title->getPrefixedText() ),
 781                                         array(),
 782                                         array( 'target' => $title->getPrefixedText() )
 783                                 );
 784                         } else {
 785                                 // The title is no longer valid, show as text
 786                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 787                                 $item = htmlspecialchars( $title->getPrefixedText() );
 788                         }
 789                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 790                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 791                 }
 792                 $result->free();
 793                 $out->addHTML( "</ul>\n" );
 794
 795                 return true;
 796         }
 797
 798         private function showRevision( $timestamp ) {
 799                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 800                         return 0;
 801                 }
 802
 803                 $archive = new PageArchive( $this->mTargetObj );
 804                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 805                 $rev = $archive->getRevision( $timestamp );
 806
 807                 $out = $this->getOutput();
 808                 $user = $this->getUser();
 809
 810                 if( !$rev ) {
 811                         $out->addWikiMsg( 'undeleterevision-missing' );
 812                         return;
 813                 }
 814
 815                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 816                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 817                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 818                                 return;
 819                         } else {
 820                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 821                                 $out->addHTML( '<br />' );
 822                                 // and we are allowed to see...
 823                         }
 824                 }
 825
 826                 if( $this->mDiff ) {
 827                         $previousRev = $archive->getPreviousRevision( $timestamp );
 828                         if( $previousRev ) {
 829                                 $this->showDiff( $previousRev, $rev );
 830                                 if( $this->mDiffOnly ) {
 831                                         return;
 832                                 } else {
 833                                         $out->addHTML( '<hr />' );
 834                                 }
 835                         } else {
 836                                 $out->addWikiMsg( 'undelete-nodiff' );
 837                         }
 838                 }
 839
 840                 $link = Linker::linkKnown(
 841                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 842                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 843                 );
 844
 845                 $lang = $this->getLanguage();
 846
 847                 // date and time are separate parameters to facilitate localisation.
 848                 // $time is kept for backward compat reasons.
 849                 $time = $lang->userTimeAndDate( $timestamp, $user );
 850                 $d = $lang->userDate( $timestamp, $user );
 851                 $t = $lang->userTime( $timestamp, $user );
 852                 $userLink = Linker::revUserTools( $rev );
 853
 854                 if( $this->mPreview ) {
 855                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 856                 } else {
 857                         $openDiv = '<div id="mw-undelete-revision">';
 858                 }
 859                 $out->addHTML( $openDiv );
 860
 861                 // Revision delete links
 862                 if ( !$this->mDiff ) {
 863                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 864                         if ( $revdel ) {
 865                                 $out->addHTML( "$revdel " );
 866                         }
 867                 }
 868
 869                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 870                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 871                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 872
 873                 if( $this->mPreview ) {
 874                         // Hide [edit]s
 875                         //FIXME: ContentHandler will have to provide some specialized magic to do this
 876                         $popts = $out->parserOptions();
 877                         $popts->setEditSection( false );
 878                         $out->parserOptions( $popts );
 879                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER, $user ), $this->mTargetObj, true );
 880                 }
 881
 882                 $out->addHTML(
 883                         Xml::element( 'textarea', array(
 884                                         'readonly' => 'readonly',
 885                                         'cols' => intval( $user->getOption( 'cols' ) ),
 886                                         'rows' => intval( $user->getOption( 'rows' ) ) ),
 887                                 $rev->getText( Revision::FOR_THIS_USER, $user ) . "\n" ) . //FIXME: ContentHandler will have to provide some specialized magic to do this
 888                         Xml::openElement( 'div' ) .
 889                         Xml::openElement( 'form', array(
 890                                 'method' => 'post',
 891                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 892                         Xml::element( 'input', array(
 893                                 'type' => 'hidden',
 894                                 'name' => 'target',
 895                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 896                         Xml::element( 'input', array(
 897                                 'type' => 'hidden',
 898                                 'name' => 'timestamp',
 899                                 'value' => $timestamp ) ) .
 900                         Xml::element( 'input', array(
 901                                 'type' => 'hidden',
 902                                 'name' => 'wpEditToken',
 903                                 'value' => $user->getEditToken() ) ) .
 904                         Xml::element( 'input', array(
 905                                 'type' => 'submit',
 906                                 'name' => 'preview',
 907                                 'value' => $this->msg( 'showpreview' )->text() ) ) .
 908                         Xml::element( 'input', array(
 909                                 'name' => 'diff',
 910                                 'type' => 'submit',
 911                                 'value' => $this->msg( 'showdiff' )->text() ) ) .
 912                         Xml::closeElement( 'form' ) .
 913                         Xml::closeElement( 'div' ) );
 914         }
 915
 916         /**
 917          * Build a diff display between this and the previous either deleted
 918          * or non-deleted edit.
 919          *
 920          * @param $previousRev Revision
 921          * @param $currentRev Revision
 922          * @return String: HTML
 923          */
 924         function showDiff( $previousRev, $currentRev ) {
 925                 $contentHandler = ContentHandler::getForTitle( $this->getTitle() );
 926                 $diffEngine = $contentHandler->createDifferenceEngine( $this->getContext() );
 927                 $diffEngine->showDiffStyle();
 928                 $this->getOutput()->addHTML(
 929                         "<div>" .
 930                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 931                         "<col class='diff-marker' />" .
 932                         "<col class='diff-content' />" .
 933                         "<col class='diff-marker' />" .
 934                         "<col class='diff-content' />" .
 935                         "<tr>" .
 936                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 937                                 $this->diffHeader( $previousRev, 'o' ) .
 938                                 "</td>\n" .
 939                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 940                                 $this->diffHeader( $currentRev, 'n' ) .
 941                                 "</td>\n" .
 942                         "</tr>" .
 943                         $diffEngine->generateContentDiffBody(
 944                                 $previousRev->getContent(), $currentRev->getContent() ) .
 945                         "</table>" .
 946                         "</div>\n"
 947                 );
 948         }
 949
 950         /**
 951          * @param $rev Revision
 952          * @param $prefix
 953          * @return string
 954          */
 955         private function diffHeader( $rev, $prefix ) {
 956                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 957                 if( $isDeleted ) {
 958                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 959                         $targetPage = $this->getTitle();
 960                         $targetQuery = array(
 961                                 'target' => $this->mTargetObj->getPrefixedText(),
 962                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 963                         );
 964                 } else {
 965                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 966                         $targetPage = $rev->getTitle();
 967                         $targetQuery = array( 'oldid' => $rev->getId() );
 968                 }
 969                 // Add show/hide deletion links if available
 970                 $user = $this->getUser();
 971                 $lang = $this->getLanguage();
 972                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 973                 if ( $rdel ) $rdel = " $rdel";
 974                 return
 975                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 976                                 Linker::link(
 977                                         $targetPage,
 978                                         $this->msg(
 979                                                 'revisionasof',
 980                                                 $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
 981                                                 $lang->userDate( $rev->getTimestamp(), $user ),
 982                                                 $lang->userTime( $rev->getTimestamp(), $user )
 983                                         )->escaped(),
 984                                         array(),
 985                                         $targetQuery
 986                                 ) .
 987                         '</strong></div>' .
 988                         '<div id="mw-diff-'.$prefix.'title2">' .
 989                                 Linker::revUserTools( $rev ) . '<br />' .
 990                         '</div>' .
 991                         '<div id="mw-diff-'.$prefix.'title3">' .
 992                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 993                         '</div>';
 994         }
 995
 996         /**
 997          * Show a form confirming whether a tokenless user really wants to see a file
 998          */
 999         private function showFileConfirmationForm( $key ) {
1000                 $out = $this->getOutput();
1001                 $lang = $this->getLanguage();
1002                 $user = $this->getUser();
1003                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1004                 $out->addWikiMsg( 'undelete-show-file-confirm',
1005                         $this->mTargetObj->getText(),
1006                         $lang->userDate( $file->getTimestamp(), $user ),
1007                         $lang->userTime( $file->getTimestamp(), $user ) );
1008                 $out->addHTML(
1009                         Xml::openElement( 'form', array(
1010                                 'method' => 'POST',
1011                                 'action' => $this->getTitle()->getLocalURL(
1012                                         'target=' . urlencode( $this->mTarget ) .
1013                                         '&file=' . urlencode( $key ) .
1014                                         '&token=' . urlencode( $user->getEditToken( $key ) ) )
1015                                 )
1016                         ) .
1017                         Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1018                         '</form>'
1019                 );
1020         }
1021
1022         /**
1023          * Show a deleted file version requested by the visitor.
1024          */
1025         private function showFile( $key ) {
1026                 $this->getOutput()->disable();
1027
1028                 # We mustn't allow the output to be Squid cached, otherwise
1029                 # if an admin previews a deleted image, and it's cached, then
1030                 # a user without appropriate permissions can toddle off and
1031                 # nab the image, and Squid will serve it
1032                 $response = $this->getRequest()->response();
1033                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1034                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1035                 $response->header( 'Pragma: no-cache' );
1036
1037                 $repo = RepoGroup::singleton()->getLocalRepo();
1038                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1039                 $repo->streamFile( $path );
1040         }
1041
1042         private function showHistory() {
1043                 $out = $this->getOutput();
1044                 if( $this->mAllowed ) {
1045                         $out->addModules( 'mediawiki.special.undelete' );
1046                 }
1047                 $out->wrapWikiMsg(
1048                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1049                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1050                 );
1051
1052                 $archive = new PageArchive( $this->mTargetObj );
1053                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1054                 /*
1055                 $text = $archive->getLastRevisionText();
1056                 if( is_null( $text ) ) {
1057                         $out->addWikiMsg( 'nohistory' );
1058                         return;
1059                 }
1060                 */
1061                 $out->addHTML( '<div class="mw-undelete-history">' );
1062                 if ( $this->mAllowed ) {
1063                         $out->addWikiMsg( 'undeletehistory' );
1064                         $out->addWikiMsg( 'undeleterevdel' );
1065                 } else {
1066                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1067                 }
1068                 $out->addHTML( '</div>' );
1069
1070                 # List all stored revisions
1071                 $revisions = $archive->listRevisions();
1072                 $files = $archive->listFiles();
1073
1074                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1075                 $haveFiles = $files && $files->numRows() > 0;
1076
1077                 # Batch existence check on user and talk pages
1078                 if( $haveRevisions ) {
1079                         $batch = new LinkBatch();
1080                         foreach ( $revisions as $row ) {
1081                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1082                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1083                         }
1084                         $batch->execute();
1085                         $revisions->seek( 0 );
1086                 }
1087                 if( $haveFiles ) {
1088                         $batch = new LinkBatch();
1089                         foreach ( $files as $row ) {
1090                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1091                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1092                         }
1093                         $batch->execute();
1094                         $files->seek( 0 );
1095                 }
1096
1097                 if ( $this->mAllowed ) {
1098                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1099                         # Start the form here
1100                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1101                         $out->addHTML( $top );
1102                 }
1103
1104                 # Show relevant lines from the deletion log:
1105                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1106                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1107                 # Show relevant lines from the suppression log:
1108                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1109                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1110                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1111                 }
1112
1113                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1114                         # Format the user-visible controls (comment field, submission button)
1115                         # in a nice little table
1116                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1117                                 $unsuppressBox =
1118                                         "<tr>
1119                                                 <td>&#160;</td>
1120                                                 <td class='mw-input'>" .
1121                                                         Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1122                                                                 'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ).
1123                                                 "</td>
1124                                         </tr>";
1125                         } else {
1126                                 $unsuppressBox = '';
1127                         }
1128                         $table =
1129                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1130                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1131                                         "<tr>
1132                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1133                                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1134                                                 "</td>
1135                                         </tr>
1136                                         <tr>
1137                                                 <td class='mw-label'>" .
1138                                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1139                                                 "</td>
1140                                                 <td class='mw-input'>" .
1141                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1142                                                 "</td>
1143                                         </tr>
1144                                         <tr>
1145                                                 <td>&#160;</td>
1146                                                 <td class='mw-submit'>" .
1147                                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1148                                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1149                                                 "</td>
1150                                         </tr>" .
1151                                         $unsuppressBox .
1152                                 Xml::closeElement( 'table' ) .
1153                                 Xml::closeElement( 'fieldset' );
1154
1155                         $out->addHTML( $table );
1156                 }
1157
1158                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1159
1160                 if( $haveRevisions ) {
1161                         # The page's stored (deleted) history:
1162                         $out->addHTML( '<ul>' );
1163                         $remaining = $revisions->numRows();
1164                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1165
1166                         foreach ( $revisions as $row ) {
1167                                 $remaining--;
1168                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1169                         }
1170                         $revisions->free();
1171                         $out->addHTML( '</ul>' );
1172                 } else {
1173                         $out->addWikiMsg( 'nohistory' );
1174                 }
1175
1176                 if( $haveFiles ) {
1177                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1178                         $out->addHTML( '<ul>' );
1179                         foreach ( $files as $row ) {
1180                                 $out->addHTML( $this->formatFileRow( $row ) );
1181                         }
1182                         $files->free();
1183                         $out->addHTML( '</ul>' );
1184                 }
1185
1186                 if ( $this->mAllowed ) {
1187                         # Slip in the hidden controls here
1188                         $misc  = Html::hidden( 'target', $this->mTarget );
1189                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1190                         $misc .= Xml::closeElement( 'form' );
1191                         $out->addHTML( $misc );
1192                 }
1193
1194                 return true;
1195         }
1196
1197         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1198                 $rev = Revision::newFromArchiveRow( $row,
1199                         array( 'page' => $this->mTargetObj->getArticleID() ) );
1200                 $revTextSize = '';
1201                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1202                 // Build checkboxen...
1203                 if( $this->mAllowed ) {
1204                         if( $this->mInvert ) {
1205                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1206                                         $checkBox = Xml::check( "ts$ts" );
1207                                 } else {
1208                                         $checkBox = Xml::check( "ts$ts", true );
1209                                 }
1210                         } else {
1211                                 $checkBox = Xml::check( "ts$ts" );
1212                         }
1213                 } else {
1214                         $checkBox = '';
1215                 }
1216                 $user = $this->getUser();
1217                 // Build page & diff links...
1218                 if( $this->mCanView ) {
1219                         $titleObj = $this->getTitle();
1220                         # Last link
1221                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1222                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1223                                 $last = $this->msg( 'diff' )->escaped();
1224                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1225                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1226                                 $last = Linker::linkKnown(
1227                                         $titleObj,
1228                                         $this->msg( 'diff' )->escaped(),
1229                                         array(),
1230                                         array(
1231                                                 'target' => $this->mTargetObj->getPrefixedText(),
1232                                                 'timestamp' => $ts,
1233                                                 'diff' => 'prev'
1234                                         )
1235                                 );
1236                         } else {
1237                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1238                                 $last = $this->msg( 'diff' )->escaped();
1239                         }
1240                 } else {
1241                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1242                         $last = $this->msg( 'diff' )->escaped();
1243                 }
1244                 // User links
1245                 $userLink = Linker::revUserTools( $rev );
1246                 // Revision text size
1247                 $size = $row->ar_len;
1248                 if( !is_null( $size ) ) {
1249                         $revTextSize = Linker::formatRevisionSize( $size );
1250                 }
1251                 // Edit summary
1252                 $comment = Linker::revComment( $rev );
1253                 // Revision delete links
1254                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1255
1256                 $revisionRow = $this->msg( 'undelete-revisionrow' )->rawParams( $checkBox, $revdlink, $last, $pageLink , $userLink, $revTextSize, $comment )->escaped();
1257                 return "<li>$revisionRow</li>";
1258         }
1259
1260         private function formatFileRow( $row ) {
1261                 $file = ArchivedFile::newFromRow( $row );
1262
1263                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1264                 $user = $this->getUser();
1265                 if( $this->mAllowed && $row->fa_storage_key ) {
1266                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1267                         $key = urlencode( $row->fa_storage_key );
1268                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1269                 } else {
1270                         $checkBox = '';
1271                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1272                 }
1273                 $userLink = $this->getFileUser( $file );
1274                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1275                 $bytes = $this->msg( 'parentheses' )->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )->plain();
1276                 $data = htmlspecialchars( $data . ' ' . $bytes );
1277                 $comment = $this->getFileComment( $file );
1278
1279                 // Add show/hide deletion links if available
1280                 $canHide = $user->isAllowed( 'deleterevision' );
1281                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1282                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1283                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1284                         } else {
1285                                 $query = array(
1286                                         'type' => 'filearchive',
1287                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1288                                         'ids' => $row->fa_id
1289                                 );
1290                                 $revdlink = Linker::revDeleteLink( $query,
1291                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1292                         }
1293                 } else {
1294                         $revdlink = '';
1295                 }
1296
1297                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1298         }
1299
1300         /**
1301          * Fetch revision text link if it's available to all users
1302          *
1303          * @param $rev Revision
1304          * @param $titleObj Title
1305          * @param $ts string Timestamp
1306          * @return string
1307          */
1308         function getPageLink( $rev, $titleObj, $ts ) {
1309                 $user = $this->getUser();
1310                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1311
1312                 if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1313                         return '<span class="history-deleted">' . $time . '</span>';
1314                 } else {
1315                         $link = Linker::linkKnown(
1316                                 $titleObj,
1317                                 htmlspecialchars( $time ),
1318                                 array(),
1319                                 array(
1320                                         'target' => $this->mTargetObj->getPrefixedText(),
1321                                         'timestamp' => $ts
1322                                 )
1323                         );
1324                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1325                                 $link = '<span class="history-deleted">' . $link . '</span>';
1326                         }
1327                         return $link;
1328                 }
1329         }
1330
1331         /**
1332          * Fetch image view link if it's available to all users
1333          *
1334          * @param $file File
1335          * @param $titleObj Title
1336          * @param $ts string A timestamp
1337          * @param $key String: a storage key
1338          *
1339          * @return String: HTML fragment
1340          */
1341         function getFileLink( $file, $titleObj, $ts, $key ) {
1342                 $user = $this->getUser();
1343                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1344
1345                 if( !$file->userCan( File::DELETED_FILE, $user ) ) {
1346                         return '<span class="history-deleted">' . $time . '</span>';
1347                 } else {
1348                         $link = Linker::linkKnown(
1349                                 $titleObj,
1350                                 htmlspecialchars( $time ),
1351                                 array(),
1352                                 array(
1353                                         'target' => $this->mTargetObj->getPrefixedText(),
1354                                         'file' => $key,
1355                                         'token' => $user->getEditToken( $key )
1356                                 )
1357                         );
1358                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1359                                 $link = '<span class="history-deleted">' . $link . '</span>';
1360                         }
1361                         return $link;
1362                 }
1363         }
1364
1365         /**
1366          * Fetch file's user id if it's available to this user
1367          *
1368          * @param $file File
1369          * @return String: HTML fragment
1370          */
1371         function getFileUser( $file ) {
1372                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1373                         return '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1374                 } else {
1375                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1376                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1377                         if( $file->isDeleted( File::DELETED_USER ) ) {
1378                                 $link = '<span class="history-deleted">' . $link . '</span>';
1379                         }
1380                         return $link;
1381                 }
1382         }
1383
1384         /**
1385          * Fetch file upload comment if it's available to this user
1386          *
1387          * @param $file File
1388          * @return String: HTML fragment
1389          */
1390         function getFileComment( $file ) {
1391                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1392                         return '<span class="history-deleted"><span class="comment">' .
1393                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1394                 } else {
1395                         $link = Linker::commentBlock( $file->getRawDescription() );
1396                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1397                                 $link = '<span class="history-deleted">' . $link . '</span>';
1398                         }
1399                         return $link;
1400                 }
1401         }
1402
1403         function undelete() {
1404                 global $wgUploadMaintenance;
1405
1406                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1407                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1408                 }
1409
1410                 if ( wfReadOnly() ) {
1411                         throw new ReadOnlyError;
1412                 }
1413
1414                 $out = $this->getOutput();
1415                 $archive = new PageArchive( $this->mTargetObj );
1416                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1417                 $ok = $archive->undelete(
1418                         $this->mTargetTimestamp,
1419                         $this->mComment,
1420                         $this->mFileVersions,
1421                         $this->mUnsuppress );
1422
1423                 if( is_array( $ok ) ) {
1424                         if ( $ok[1] ) { // Undeleted file count
1425                                 wfRunHooks( 'FileUndeleteComplete', array(
1426                                         $this->mTargetObj, $this->mFileVersions,
1427                                         $this->getUser(), $this->mComment ) );
1428                         }
1429
1430                         $link = Linker::linkKnown( $this->mTargetObj );
1431                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1432                 } else {
1433                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1434                         $out->addWikiMsg( 'cannotundelete' );
1435                         $out->addWikiMsg( 'undeleterevdel' );
1436                 }
1437
1438                 // Show file deletion warnings and errors
1439                 $status = $archive->getFileStatus();
1440                 if( $status && !$status->isGood() ) {
1441                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1442                 }
1443         }
1444 }