includes/specials/SpecialUndelete.php

   1 <?php
   2
   3 /**
   4  * Special page allowing users with the appropriate permissions to view
   5  * and restore deleted content
   6  *
   7  * @file
   8  * @ingroup SpecialPage
   9  */
  10
  11 /**
  12  * Constructor
  13  */
  14 function wfSpecialUndelete( $par ) {
  15         global $wgRequest;
  16
  17         $form = new UndeleteForm( $wgRequest, $par );
  18         $form->execute();
  19 }
  20
  21 /**
  22  * Used to show archived pages and eventually restore them.
  23  * @ingroup SpecialPage
  24  */
  25 class PageArchive {
  26         protected $title;
  27         var $fileStatus;
  28
  29         function __construct( $title ) {
  30                 if( is_null( $title ) ) {
  31                         throw new MWException( 'Archiver() given a null title.');
  32                 }
  33                 $this->title = $title;
  34         }
  35
  36         /**
  37          * List all deleted pages recorded in the archive table. Returns result
  38          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  39          * namespace/title.
  40          *
  41          * @return ResultWrapper
  42          */
  43         public static function listAllPages() {
  44                 $dbr = wfGetDB( DB_SLAVE );
  45                 return self::listPages( $dbr, '' );
  46         }
  47
  48         /**
  49          * List deleted pages recorded in the archive table matching the
  50          * given title prefix.
  51          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  52          *
  53          * @return ResultWrapper
  54          */
  55         public static function listPagesByPrefix( $prefix ) {
  56                 $dbr = wfGetDB( DB_SLAVE );
  57
  58                 $title = Title::newFromText( $prefix );
  59                 if( $title ) {
  60                         $ns = $title->getNamespace();
  61                         $encPrefix = $dbr->escapeLike( $title->getDBkey() );
  62                 } else {
  63                         // Prolly won't work too good
  64                         // @todo handle bare namespace names cleanly?
  65                         $ns = 0;
  66                         $encPrefix = $dbr->escapeLike( $prefix );
  67                 }
  68                 $conds = array(
  69                         'ar_namespace' => $ns,
  70                         "ar_title LIKE '$encPrefix%'",
  71                 );
  72                 return self::listPages( $dbr, $conds );
  73         }
  74
  75         protected static function listPages( $dbr, $condition ) {
  76                 return $dbr->resultObject(
  77                         $dbr->select(
  78                                 array( 'archive' ),
  79                                 array(
  80                                         'ar_namespace',
  81                                         'ar_title',
  82                                         'COUNT(*) AS count'
  83                                 ),
  84                                 $condition,
  85                                 __METHOD__,
  86                                 array(
  87                                         'GROUP BY' => 'ar_namespace,ar_title',
  88                                         'ORDER BY' => 'ar_namespace,ar_title',
  89                                         'LIMIT' => 100,
  90                                 )
  91                         )
  92                 );
  93         }
  94
  95         /**
  96          * List the revisions of the given page. Returns result wrapper with
  97          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
  98          *
  99          * @return ResultWrapper
 100          */
 101         function listRevisions() {
 102                 $dbr = wfGetDB( DB_SLAVE );
 103                 $res = $dbr->select( 'archive',
 104                         array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment', 'ar_len', 'ar_deleted' ),
 105                         array( 'ar_namespace' => $this->title->getNamespace(),
 106                                'ar_title' => $this->title->getDBkey() ),
 107                         'PageArchive::listRevisions',
 108                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 109                 $ret = $dbr->resultObject( $res );
 110                 return $ret;
 111         }
 112
 113         /**
 114          * List the deleted file revisions for this page, if it's a file page.
 115          * Returns a result wrapper with various filearchive fields, or null
 116          * if not a file page.
 117          *
 118          * @return ResultWrapper
 119          * @todo Does this belong in Image for fuller encapsulation?
 120          */
 121         function listFiles() {
 122                 if( $this->title->getNamespace() == NS_FILE ) {
 123                         $dbr = wfGetDB( DB_SLAVE );
 124                         $res = $dbr->select( 'filearchive',
 125                                 array(
 126                                         'fa_id',
 127                                         'fa_name',
 128                                         'fa_archive_name',
 129                                         'fa_storage_key',
 130                                         'fa_storage_group',
 131                                         'fa_size',
 132                                         'fa_width',
 133                                         'fa_height',
 134                                         'fa_bits',
 135                                         'fa_metadata',
 136                                         'fa_media_type',
 137                                         'fa_major_mime',
 138                                         'fa_minor_mime',
 139                                         'fa_description',
 140                                         'fa_user',
 141                                         'fa_user_text',
 142                                         'fa_timestamp',
 143                                         'fa_deleted' ),
 144                                 array( 'fa_name' => $this->title->getDBkey() ),
 145                                 __METHOD__,
 146                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 147                         $ret = $dbr->resultObject( $res );
 148                         return $ret;
 149                 }
 150                 return null;
 151         }
 152
 153         /**
 154          * Fetch (and decompress if necessary) the stored text for the deleted
 155          * revision of the page with the given timestamp.
 156          *
 157          * @return string
 158          * @deprecated Use getRevision() for more flexible information
 159          */
 160         function getRevisionText( $timestamp ) {
 161                 $rev = $this->getRevision( $timestamp );
 162                 return $rev ? $rev->getText() : null;
 163         }
 164
 165         /**
 166          * Return a Revision object containing data for the deleted revision.
 167          * Note that the result *may* or *may not* have a null page ID.
 168          * @param string $timestamp
 169          * @return Revision
 170          */
 171         function getRevision( $timestamp ) {
 172                 $dbr = wfGetDB( DB_SLAVE );
 173                 $row = $dbr->selectRow( 'archive',
 174                         array(
 175                                 'ar_rev_id',
 176                                 'ar_text',
 177                                 'ar_comment',
 178                                 'ar_user',
 179                                 'ar_user_text',
 180                                 'ar_timestamp',
 181                                 'ar_minor_edit',
 182                                 'ar_flags',
 183                                 'ar_text_id',
 184                                 'ar_deleted',
 185                                 'ar_len' ),
 186                         array( 'ar_namespace' => $this->title->getNamespace(),
 187                                'ar_title' => $this->title->getDBkey(),
 188                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 189                         __METHOD__ );
 190                 if( $row ) {
 191                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 192                 } else {
 193                         return null;
 194                 }
 195         }
 196
 197         /**
 198          * Return the most-previous revision, either live or deleted, against
 199          * the deleted revision given by timestamp.
 200          *
 201          * May produce unexpected results in case of history merges or other
 202          * unusual time issues.
 203          *
 204          * @param string $timestamp
 205          * @return Revision or null
 206          */
 207         function getPreviousRevision( $timestamp ) {
 208                 $dbr = wfGetDB( DB_SLAVE );
 209
 210                 // Check the previous deleted revision...
 211                 $row = $dbr->selectRow( 'archive',
 212                         'ar_timestamp',
 213                         array( 'ar_namespace' => $this->title->getNamespace(),
 214                                'ar_title' => $this->title->getDBkey(),
 215                                'ar_timestamp < ' .
 216                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 217                         __METHOD__,
 218                         array(
 219                                 'ORDER BY' => 'ar_timestamp DESC',
 220                                 'LIMIT' => 1 ) );
 221                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 222
 223                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 224                         array( 'rev_id', 'rev_timestamp' ),
 225                         array(
 226                                 'page_namespace' => $this->title->getNamespace(),
 227                                 'page_title' => $this->title->getDBkey(),
 228                                 'page_id = rev_page',
 229                                 'rev_timestamp < ' .
 230                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 231                         __METHOD__,
 232                         array(
 233                                 'ORDER BY' => 'rev_timestamp DESC',
 234                                 'LIMIT' => 1 ) );
 235                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 236                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 237
 238                 if( $prevLive && $prevLive > $prevDeleted ) {
 239                         // Most prior revision was live
 240                         return Revision::newFromId( $prevLiveId );
 241                 } elseif( $prevDeleted ) {
 242                         // Most prior revision was deleted
 243                         return $this->getRevision( $prevDeleted );
 244                 } else {
 245                         // No prior revision on this page.
 246                         return null;
 247                 }
 248         }
 249
 250         /**
 251          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 252          */
 253         function getTextFromRow( $row ) {
 254                 if( is_null( $row->ar_text_id ) ) {
 255                         // An old row from MediaWiki 1.4 or previous.
 256                         // Text is embedded in this row in classic compression format.
 257                         return Revision::getRevisionText( $row, "ar_" );
 258                 } else {
 259                         // New-style: keyed to the text storage backend.
 260                         $dbr = wfGetDB( DB_SLAVE );
 261                         $text = $dbr->selectRow( 'text',
 262                                 array( 'old_text', 'old_flags' ),
 263                                 array( 'old_id' => $row->ar_text_id ),
 264                                 __METHOD__ );
 265                         return Revision::getRevisionText( $text );
 266                 }
 267         }
 268
 269
 270         /**
 271          * Fetch (and decompress if necessary) the stored text of the most
 272          * recently edited deleted revision of the page.
 273          *
 274          * If there are no archived revisions for the page, returns NULL.
 275          *
 276          * @return string
 277          */
 278         function getLastRevisionText() {
 279                 $dbr = wfGetDB( DB_SLAVE );
 280                 $row = $dbr->selectRow( 'archive',
 281                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 282                         array( 'ar_namespace' => $this->title->getNamespace(),
 283                                'ar_title' => $this->title->getDBkey() ),
 284                         'PageArchive::getLastRevisionText',
 285                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 286                 if( $row ) {
 287                         return $this->getTextFromRow( $row );
 288                 } else {
 289                         return NULL;
 290                 }
 291         }
 292
 293         /**
 294          * Quick check if any archived revisions are present for the page.
 295          * @return bool
 296          */
 297         function isDeleted() {
 298                 $dbr = wfGetDB( DB_SLAVE );
 299                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 300                         array( 'ar_namespace' => $this->title->getNamespace(),
 301                                'ar_title' => $this->title->getDBkey() ) );
 302                 return ($n > 0);
 303         }
 304
 305         /**
 306          * Restore the given (or all) text and file revisions for the page.
 307          * Once restored, the items will be removed from the archive tables.
 308          * The deletion log will be updated with an undeletion notice.
 309          *
 310          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 311          * @param string $comment
 312          * @param array $fileVersions
 313          * @param bool $unsuppress
 314          *
 315          * @return array(number of file revisions restored, number of image revisions restored, log message)
 316          * on success, false on failure
 317          */
 318         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 319                 // If both the set of text revisions and file revisions are empty,
 320                 // restore everything. Otherwise, just restore the requested items.
 321                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 322
 323                 $restoreText = $restoreAll || !empty( $timestamps );
 324                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 325
 326                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 327                         $img = wfLocalFile( $this->title );
 328                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 329                         $filesRestored = $this->fileStatus->successCount;
 330                 } else {
 331                         $filesRestored = 0;
 332                 }
 333
 334                 if( $restoreText ) {
 335                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress );
 336                         if($textRestored === false) // It must be one of UNDELETE_*
 337                                 return false;
 338                 } else {
 339                         $textRestored = 0;
 340                 }
 341
 342                 // Touch the log!
 343                 global $wgContLang;
 344                 $log = new LogPage( 'delete' );
 345
 346                 if( $textRestored && $filesRestored ) {
 347                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 348                                 $wgContLang->formatNum( $textRestored ),
 349                                 $wgContLang->formatNum( $filesRestored ) );
 350                 } elseif( $textRestored ) {
 351                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 352                                 $wgContLang->formatNum( $textRestored ) );
 353                 } elseif( $filesRestored ) {
 354                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 355                                 $wgContLang->formatNum( $filesRestored ) );
 356                 } else {
 357                         wfDebug( "Undelete: nothing undeleted...\n" );
 358                         return false;
 359                 }
 360
 361                 if( trim( $comment ) != '' )
 362                         $reason .= ": {$comment}";
 363                 $log->addEntry( 'restore', $this->title, $reason );
 364
 365                 return array($textRestored, $filesRestored, $reason);
 366         }
 367
 368         /**
 369          * This is the meaty bit -- restores archived revisions of the given page
 370          * to the cur/old tables. If the page currently exists, all revisions will
 371          * be stuffed into old, otherwise the most recent will go into cur.
 372          *
 373          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 374          * @param string $comment
 375          * @param array $fileVersions
 376          * @param bool $unsuppress, remove all ar_deleted/fa_deleted restrictions of seletected revs
 377          *
 378          * @return mixed number of revisions restored or false on failure
 379          */
 380         private function undeleteRevisions( $timestamps, $unsuppress = false ) {
 381                 if ( wfReadOnly() )
 382                         return false;
 383                 $restoreAll = empty( $timestamps );
 384
 385                 $dbw = wfGetDB( DB_MASTER );
 386
 387                 # Does this page already exist? We'll have to update it...
 388                 $article = new Article( $this->title );
 389                 $options = 'FOR UPDATE';
 390                 $page = $dbw->selectRow( 'page',
 391                         array( 'page_id', 'page_latest' ),
 392                         array( 'page_namespace' => $this->title->getNamespace(),
 393                                'page_title'     => $this->title->getDBkey() ),
 394                         __METHOD__,
 395                         $options );
 396                 if( $page ) {
 397                         $makepage = false;
 398                         # Page already exists. Import the history, and if necessary
 399                         # we'll update the latest revision field in the record.
 400                         $newid             = 0;
 401                         $pageId            = $page->page_id;
 402                         $previousRevId    = $page->page_latest;
 403                         # Get the time span of this page
 404                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 405                                 array( 'rev_id' => $previousRevId ),
 406                                 __METHOD__ );
 407                         if( $previousTimestamp === false ) {
 408                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 409                                 return 0;
 410                         }
 411                 } else {
 412                         # Have to create a new article...
 413                         $makepage = true;
 414                         $previousRevId = 0;
 415                         $previousTimestamp = 0;
 416                 }
 417
 418                 if( $restoreAll ) {
 419                         $oldones = '1 = 1'; # All revisions...
 420                 } else {
 421                         $oldts = implode( ',',
 422                                 array_map( array( &$dbw, 'addQuotes' ),
 423                                         array_map( array( &$dbw, 'timestamp' ),
 424                                                 $timestamps ) ) );
 425
 426                         $oldones = "ar_timestamp IN ( {$oldts} )";
 427                 }
 428
 429                 /**
 430                  * Select each archived revision...
 431                  */
 432                 $result = $dbw->select( 'archive',
 433                         /* fields */ array(
 434                                 'ar_rev_id',
 435                                 'ar_text',
 436                                 'ar_comment',
 437                                 'ar_user',
 438                                 'ar_user_text',
 439                                 'ar_timestamp',
 440                                 'ar_minor_edit',
 441                                 'ar_flags',
 442                                 'ar_text_id',
 443                                 'ar_deleted',
 444                                 'ar_page_id',
 445                                 'ar_len' ),
 446                         /* WHERE */ array(
 447                                 'ar_namespace' => $this->title->getNamespace(),
 448                                 'ar_title'     => $this->title->getDBkey(),
 449                                 $oldones ),
 450                         __METHOD__,
 451                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 452                         );
 453                 $ret = $dbw->resultObject( $result );
 454                 $rev_count = $dbw->numRows( $result );
 455
 456                 if( $makepage ) {
 457                         $newid  = $article->insertOn( $dbw );
 458                         $pageId = $newid;
 459                 }
 460
 461                 $revision = null;
 462                 $restored = 0;
 463
 464                 while( $row = $ret->fetchObject() ) {
 465                         // Check for key dupes due to shitty archive integrity.
 466                         if( $row->ar_rev_id ) {
 467                                 $exists = $dbw->selectField( 'revision', '1', array('rev_id' => $row->ar_rev_id), __METHOD__ );
 468                                 if( $exists ) continue; // don't throw DB errors
 469                         }
 470
 471                         $revision = Revision::newFromArchiveRow( $row,
 472                                 array(
 473                                         'page' => $pageId,
 474                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 475                                 ) );
 476
 477                         $revision->insertOn( $dbw );
 478                         $restored++;
 479
 480                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 481                 }
 482                 # Now that it's safely stored, take it out of the archive
 483                 $dbw->delete( 'archive',
 484                         /* WHERE */ array(
 485                                 'ar_namespace' => $this->title->getNamespace(),
 486                                 'ar_title' => $this->title->getDBkey(),
 487                                 $oldones ),
 488                         __METHOD__ );
 489
 490                 // Was anything restored at all?
 491                 if( $restored == 0 )
 492                         return 0;
 493
 494                 if( $revision ) {
 495                         // Attach the latest revision to the page...
 496                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 497                         if( $newid || $wasnew ) {
 498                                 // We don't handle well with top revision deleted
 499                                 // FIXME: any sysop can unsuppress any revision by just undeleting it into a non-existent page!
 500                                 if( $revision->getVisibility() ) {
 501                                         $dbw->update( 'revision',
 502                                                 array( 'rev_deleted' => 0 ),
 503                                                 array( 'rev_id' => $revision->getId() ),
 504                                                 __METHOD__
 505                                         );
 506                                         $revision->mDeleted = 0; // Don't pollute the parser cache
 507                                 }
 508                                 // Update site stats, link tables, etc
 509                                 $article->createUpdates( $revision );
 510                         }
 511
 512                         if( $newid ) {
 513                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true ) );
 514                                 Article::onArticleCreate( $this->title );
 515                         } else {
 516                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false ) );
 517                                 Article::onArticleEdit( $this->title );
 518                         }
 519
 520                         if( $this->title->getNamespace() == NS_FILE ) {
 521                                 $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 522                                 $update->doUpdate();
 523                         }
 524                 } else {
 525                         // Revision couldn't be created. This is very weird
 526                         return self::UNDELETE_UNKNOWNERR;
 527                 }
 528
 529                 return $restored;
 530         }
 531
 532         function getFileStatus() { return $this->fileStatus; }
 533 }
 534
 535 /**
 536  * The HTML form for Special:Undelete, which allows users with the appropriate
 537  * permissions to view and restore deleted content.
 538  * @ingroup SpecialPage
 539  */
 540 class UndeleteForm {
 541         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj;
 542         var $mTargetTimestamp, $mAllowed, $mComment, $mToken;
 543
 544         function UndeleteForm( $request, $par = "" ) {
 545                 global $wgUser;
 546                 $this->mAction = $request->getVal( 'action' );
 547                 $this->mTarget = $request->getVal( 'target' );
 548                 $this->mSearchPrefix = $request->getText( 'prefix' );
 549                 $time = $request->getVal( 'timestamp' );
 550                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 551                 $this->mFile = $request->getVal( 'file' );
 552
 553                 $posted = $request->wasPosted() &&
 554                         $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 555                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 556                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 557                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 558                 $this->mDiff = $request->getCheck( 'diff' );
 559                 $this->mComment = $request->getText( 'wpComment' );
 560                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 561                 $this->mToken = $request->getVal( 'token' );
 562
 563                 if( $par != "" ) {
 564                         $this->mTarget = $par;
 565                 }
 566                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 567                         $this->mAllowed = true;
 568                 } else {
 569                         $this->mAllowed = false;
 570                         $this->mTimestamp = '';
 571                         $this->mRestore = false;
 572                 }
 573                 if ( $this->mTarget !== "" ) {
 574                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 575                 } else {
 576                         $this->mTargetObj = NULL;
 577                 }
 578                 if( $this->mRestore || $this->mInvert ) {
 579                         $timestamps = array();
 580                         $this->mFileVersions = array();
 581                         foreach( $_REQUEST as $key => $val ) {
 582                                 $matches = array();
 583                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 584                                         array_push( $timestamps, $matches[1] );
 585                                 }
 586
 587                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 588                                         $this->mFileVersions[] = intval( $matches[1] );
 589                                 }
 590                         }
 591                         rsort( $timestamps );
 592                         $this->mTargetTimestamp = $timestamps;
 593                 }
 594         }
 595
 596         function execute() {
 597                 global $wgOut, $wgUser;
 598                 if ( $this->mAllowed ) {
 599                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 600                 } else {
 601                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 602                 }
 603
 604                 if( is_null( $this->mTargetObj ) ) {
 605                 # Not all users can just browse every deleted page from the list
 606                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 607                                 $this->showSearchForm();
 608
 609                                 # List undeletable articles
 610                                 if( $this->mSearchPrefix ) {
 611                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 612                                         $this->showList( $result );
 613                                 }
 614                         } else {
 615                                 $wgOut->addWikiMsg( 'undelete-header' );
 616                         }
 617                         return;
 618                 }
 619                 if( $this->mTimestamp !== '' ) {
 620                         return $this->showRevision( $this->mTimestamp );
 621                 }
 622                 if( $this->mFile !== null ) {
 623                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 624                         // Check if user is allowed to see this file
 625                         if( !$file->userCan( File::DELETED_FILE ) ) {
 626                                 $wgOut->permissionRequired( 'suppressrevision' );
 627                                 return false;
 628                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFile ) ) {
 629                                 $this->showFileConfirmationForm( $this->mFile );
 630                                 return false;
 631                         } else {
 632                                 return $this->showFile( $this->mFile );
 633                         }
 634                 }
 635                 if( $this->mRestore && $this->mAction == "submit" ) {
 636                         return $this->undelete();
 637                 }
 638                 if( $this->mInvert && $this->mAction == "submit" ) {
 639                         return $this->showHistory( );
 640                 }
 641                 return $this->showHistory();
 642         }
 643
 644         function showSearchForm() {
 645                 global $wgOut, $wgScript;
 646                 $wgOut->addWikiMsg( 'undelete-header' );
 647
 648                 $wgOut->addHTML(
 649                         Xml::openElement( 'form', array(
 650                                 'method' => 'get',
 651                                 'action' => $wgScript ) ) .
 652                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 653                         Xml::hidden( 'title',
 654                                 SpecialPage::getTitleFor( 'Undelete' )->getPrefixedDbKey() ) .
 655                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 656                                 'prefix', 'prefix', 20,
 657                                 $this->mSearchPrefix ) . ' ' .
 658                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 659                         Xml::closeElement( 'fieldset' ) .
 660                         Xml::closeElement( 'form' )
 661                 );
 662         }
 663
 664         // Generic list of deleted pages
 665         private function showList( $result ) {
 666                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 667
 668                 if( $result->numRows() == 0 ) {
 669                         $wgOut->addWikiMsg( 'undelete-no-results' );
 670                         return;
 671                 }
 672
 673                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 674
 675                 $sk = $wgUser->getSkin();
 676                 $undelete = SpecialPage::getTitleFor( 'Undelete' );
 677                 $wgOut->addHTML( "<ul>\n" );
 678                 while( $row = $result->fetchObject() ) {
 679                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 680                         $link = $sk->linkKnown(
 681                                 $undelete,
 682                                 htmlspecialchars( $title->getPrefixedText() ),
 683                                 array(),
 684                                 array( 'target' => $title->getPrefixedText() )
 685                         );
 686                         $revs = wfMsgExt( 'undeleterevisions',
 687                                 array( 'parseinline' ),
 688                                 $wgLang->formatNum( $row->count ) );
 689                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 690                 }
 691                 $result->free();
 692                 $wgOut->addHTML( "</ul>\n" );
 693
 694                 return true;
 695         }
 696
 697         private function showRevision( $timestamp ) {
 698                 global $wgLang, $wgUser, $wgOut;
 699                 $self = SpecialPage::getTitleFor( 'Undelete' );
 700                 $skin = $wgUser->getSkin();
 701
 702                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 703
 704                 $archive = new PageArchive( $this->mTargetObj );
 705                 $rev = $archive->getRevision( $timestamp );
 706
 707                 if( !$rev ) {
 708                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 709                         return;
 710                 }
 711
 712                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 713                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 714                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-permission' );
 715                                 return;
 716                         } else {
 717                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-view' );
 718                                 $wgOut->addHTML( '<br/>' );
 719                                 // and we are allowed to see...
 720                         }
 721                 }
 722
 723                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 724
 725                 $link = $skin->linkKnown(
 726                         SpecialPage::getTitleFor( 'Undelete', $this->mTargetObj->getPrefixedDBkey() ),
 727                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 728                 );
 729
 730                 if( $this->mDiff ) {
 731                         $previousRev = $archive->getPreviousRevision( $timestamp );
 732                         if( $previousRev ) {
 733                                 $this->showDiff( $previousRev, $rev );
 734                                 if( $wgUser->getOption( 'diffonly' ) ) {
 735                                         return;
 736                                 } else {
 737                                         $wgOut->addHTML( '<hr />' );
 738                                 }
 739                         } else {
 740                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 741                         }
 742                 }
 743
 744                 // date and time are separate parameters to facilitate localisation.
 745                 // $time is kept for backward compat reasons.
 746                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 747                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 748                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 749                 $user = $skin->revUserTools( $rev );
 750
 751                 if( $this->mPreview ) {
 752                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 753                 } else {
 754                         $openDiv = '<div id="mw-undelete-revision">';
 755                 }
 756
 757                 $wgOut->addHTML( $openDiv . wfMsgWikiHtml( 'undelete-revision', $link, $time, $user, $d, $t ) . '</div>' );
 758                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 759
 760                 if( $this->mPreview ) {
 761                         //Hide [edit]s
 762                         $popts = $wgOut->parserOptions();
 763                         $popts->setEditSection( false );
 764                         $wgOut->parserOptions( $popts );
 765                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 766                 }
 767
 768                 $wgOut->addHTML(
 769                         Xml::element( 'textarea', array(
 770                                         'readonly' => 'readonly',
 771                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 772                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 773                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 774                         Xml::openElement( 'div' ) .
 775                         Xml::openElement( 'form', array(
 776                                 'method' => 'post',
 777                                 'action' => $self->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 778                         Xml::element( 'input', array(
 779                                 'type' => 'hidden',
 780                                 'name' => 'target',
 781                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 782                         Xml::element( 'input', array(
 783                                 'type' => 'hidden',
 784                                 'name' => 'timestamp',
 785                                 'value' => $timestamp ) ) .
 786                         Xml::element( 'input', array(
 787                                 'type' => 'hidden',
 788                                 'name' => 'wpEditToken',
 789                                 'value' => $wgUser->editToken() ) ) .
 790                         Xml::element( 'input', array(
 791                                 'type' => 'submit',
 792                                 'name' => 'preview',
 793                                 'value' => wfMsg( 'showpreview' ) ) ) .
 794                         Xml::element( 'input', array(
 795                                 'name' => 'diff',
 796                                 'type' => 'submit',
 797                                 'value' => wfMsg( 'showdiff' ) ) ) .
 798                         Xml::closeElement( 'form' ) .
 799                         Xml::closeElement( 'div' ) );
 800         }
 801
 802         /**
 803          * Build a diff display between this and the previous either deleted
 804          * or non-deleted edit.
 805          * @param Revision $previousRev
 806          * @param Revision $currentRev
 807          * @return string HTML
 808          */
 809         function showDiff( $previousRev, $currentRev ) {
 810                 global $wgOut;
 811
 812                 $diffEngine = new DifferenceEngine();
 813                 $diffEngine->showDiffStyle();
 814                 $wgOut->addHTML(
 815                         "<div>" .
 816                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 817                         "<col class='diff-marker' />" .
 818                         "<col class='diff-content' />" .
 819                         "<col class='diff-marker' />" .
 820                         "<col class='diff-content' />" .
 821                         "<tr>" .
 822                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 823                                 $this->diffHeader( $previousRev, 'o' ) .
 824                                 "</td>\n" .
 825                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 826                                 $this->diffHeader( $currentRev, 'n' ) .
 827                                 "</td>\n" .
 828                         "</tr>" .
 829                         $diffEngine->generateDiffBody(
 830                                 $previousRev->getText(), $currentRev->getText() ) .
 831                         "</table>" .
 832                         "</div>\n" );
 833
 834         }
 835
 836         private function diffHeader( $rev, $prefix ) {
 837                 global $wgUser, $wgLang, $wgLang;
 838                 $sk = $wgUser->getSkin();
 839                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 840                 if( $isDeleted ) {
 841                         /// @fixme $rev->getTitle() is null for deleted revs...?
 842                         $targetPage = SpecialPage::getTitleFor( 'Undelete' );
 843                         $targetQuery = array(
 844                                 'target' => $this->mTargetObj->getPrefixedText(),
 845                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 846                         );
 847                 } else {
 848                         /// @fixme getId() may return non-zero for deleted revs...
 849                         $targetPage = $rev->getTitle();
 850                         $targetQuery = array( 'oldid' => $rev->getId() );
 851                 }
 852                 // Add show/hide link if available
 853                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 854                         // If revision was hidden from sysops
 855                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 856                                 $del = ' ' . Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ),
 857                                         '(' . wfMsgHtml('rev-delundel') . ')' );
 858                         // Otherwise, show the link...
 859                         } else {
 860                                 $query = array(
 861                                         'type' => 'archive',
 862                                         'target' => $this->mTargetObj->getPrefixedDbkey(),
 863                                         'ids' => $rev->getTimestamp() );
 864                                 $del = ' ' . $sk->revDeleteLink( $query,
 865                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ) );
 866                         }
 867                 } else {
 868                         $del = '';
 869                 }
 870                 return
 871                         '<div id="mw-diff-'.$prefix.'title1"><strong>' .
 872                                 $sk->link(
 873                                         $targetPage,
 874                                         wfMsgHtml(
 875                                                 'revisionasof',
 876                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 877                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
 878                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
 879                                         ),
 880                                         array(),
 881                                         $targetQuery
 882                                 ) .
 883                         '</strong></div>' .
 884                         '<div id="mw-diff-'.$prefix.'title2">' .
 885                                 $sk->revUserTools( $rev ) . '<br/>' .
 886                         '</div>' .
 887                         '<div id="mw-diff-'.$prefix.'title3">' .
 888                                 $sk->revComment( $rev ) . $del . '<br/>' .
 889                         '</div>';
 890         }
 891
 892         /**
 893          * Show a form confirming whether a tokenless user really wants to see a file
 894          */
 895         private function showFileConfirmationForm( $key ) {
 896                 global $wgOut, $wgUser, $wgLang;
 897                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 898                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
 899                         $this->mTargetObj->getText(),
 900                         $wgLang->date( $file->getTimestamp() ),
 901                         $wgLang->time( $file->getTimestamp() ) );
 902                 $wgOut->addHTML(
 903                         Xml::openElement( 'form', array(
 904                                 'method' => 'POST',
 905                                 'action' => SpecialPage::getTitleFor( 'Undelete' )->getLocalUrl(
 906                                         'target=' . urlencode( $this->mTarget ) .
 907                                         '&file=' . urlencode( $key ) .
 908                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
 909                                 )
 910                         ) .
 911                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
 912                         '</form>'
 913                 );
 914         }
 915
 916         /**
 917          * Show a deleted file version requested by the visitor.
 918          */
 919         private function showFile( $key ) {
 920                 global $wgOut, $wgRequest;
 921                 $wgOut->disable();
 922
 923                 # We mustn't allow the output to be Squid cached, otherwise
 924                 # if an admin previews a deleted image, and it's cached, then
 925                 # a user without appropriate permissions can toddle off and
 926                 # nab the image, and Squid will serve it
 927                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 928                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 929                 $wgRequest->response()->header( 'Pragma: no-cache' );
 930
 931                 global $IP;
 932                 require_once( "$IP/includes/StreamFile.php" );
 933                 $repo = RepoGroup::singleton()->getLocalRepo();
 934                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
 935                 wfStreamFile( $path );
 936         }
 937
 938         private function showHistory( ) {
 939                 global $wgLang, $wgUser, $wgOut;
 940
 941                 $sk = $wgUser->getSkin();
 942                 if( $this->mAllowed ) {
 943                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 944                 } else {
 945                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
 946                 }
 947
 948                 $wgOut->addWikiMsg( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() );
 949
 950                 $archive = new PageArchive( $this->mTargetObj );
 951                 /*
 952                 $text = $archive->getLastRevisionText();
 953                 if( is_null( $text ) ) {
 954                         $wgOut->addWikiMsg( "nohistory" );
 955                         return;
 956                 }
 957                 */
 958                 if ( $this->mAllowed ) {
 959                         $wgOut->addWikiMsg( "undeletehistory" );
 960                         $wgOut->addWikiMsg( "undeleterevdel" );
 961                 } else {
 962                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
 963                 }
 964
 965                 # List all stored revisions
 966                 $revisions = $archive->listRevisions();
 967                 $files = $archive->listFiles();
 968
 969                 $haveRevisions = $revisions && $revisions->numRows() > 0;
 970                 $haveFiles = $files && $files->numRows() > 0;
 971
 972                 # Batch existence check on user and talk pages
 973                 if( $haveRevisions ) {
 974                         $batch = new LinkBatch();
 975                         while( $row = $revisions->fetchObject() ) {
 976                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
 977                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
 978                         }
 979                         $batch->execute();
 980                         $revisions->seek( 0 );
 981                 }
 982                 if( $haveFiles ) {
 983                         $batch = new LinkBatch();
 984                         while( $row = $files->fetchObject() ) {
 985                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
 986                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
 987                         }
 988                         $batch->execute();
 989                         $files->seek( 0 );
 990                 }
 991
 992                 if ( $this->mAllowed ) {
 993                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
 994                         $action = $titleObj->getLocalURL( array( 'action' => 'submit' ) );
 995                         # Start the form here
 996                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
 997                         $wgOut->addHTML( $top );
 998                 }
 999
1000                 # Show relevant lines from the deletion log:
1001                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1002                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1003                 # Show relevant lines from the suppression log:
1004                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1005                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1006                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1007                 }
1008
1009                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1010                         # Format the user-visible controls (comment field, submission button)
1011                         # in a nice little table
1012                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1013                                 $unsuppressBox =
1014                                         "<tr>
1015                                                 <td>&nbsp;</td>
1016                                                 <td class='mw-input'>" .
1017                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
1018                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1019                                                 "</td>
1020                                         </tr>";
1021                         } else {
1022                                 $unsuppressBox = "";
1023                         }
1024                         $table =
1025                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1026                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1027                                         "<tr>
1028                                                 <td colspan='2'>" .
1029                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
1030                                                 "</td>
1031                                         </tr>
1032                                         <tr>
1033                                                 <td class='mw-label'>" .
1034                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1035                                                 "</td>
1036                                                 <td class='mw-input'>" .
1037                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1038                                                 "</td>
1039                                         </tr>
1040                                         <tr>
1041                                                 <td>&nbsp;</td>
1042                                                 <td class='mw-submit'>" .
1043                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1044                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) . ' ' .
1045                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1046                                                 "</td>
1047                                         </tr>" .
1048                                         $unsuppressBox .
1049                                 Xml::closeElement( 'table' ) .
1050                                 Xml::closeElement( 'fieldset' );
1051
1052                         $wgOut->addHTML( $table );
1053                 }
1054
1055                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1056
1057                 if( $haveRevisions ) {
1058                         # The page's stored (deleted) history:
1059                         $wgOut->addHTML("<ul>");
1060                         $target = urlencode( $this->mTarget );
1061                         $remaining = $revisions->numRows();
1062                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1063
1064                         while( $row = $revisions->fetchObject() ) {
1065                                 $remaining--;
1066                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1067                         }
1068                         $revisions->free();
1069                         $wgOut->addHTML("</ul>");
1070                 } else {
1071                         $wgOut->addWikiMsg( "nohistory" );
1072                 }
1073
1074                 if( $haveFiles ) {
1075                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1076                         $wgOut->addHTML( "<ul>" );
1077                         while( $row = $files->fetchObject() ) {
1078                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1079                         }
1080                         $files->free();
1081                         $wgOut->addHTML( "</ul>" );
1082                 }
1083
1084                 if ( $this->mAllowed ) {
1085                         # Slip in the hidden controls here
1086                         $misc  = Xml::hidden( 'target', $this->mTarget );
1087                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
1088                         $misc .= Xml::closeElement( 'form' );
1089                         $wgOut->addHTML( $misc );
1090                 }
1091
1092                 return true;
1093         }
1094
1095         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1096                 global $wgUser, $wgLang;
1097
1098                 $rev = Revision::newFromArchiveRow( $row,
1099                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1100                 $stxt = '';
1101                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1102                 if( $this->mAllowed ) {
1103                         if( $this->mInvert){
1104                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1105                                         $checkBox = Xml::check( "ts$ts");
1106                                 } else {
1107                                         $checkBox = Xml::check( "ts$ts", true );
1108                                 }
1109                         } else {
1110                                 $checkBox = Xml::check( "ts$ts" );
1111                         }
1112                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1113                         $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1114                         # Last link
1115                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1116                                 $last = wfMsgHtml('diff');
1117                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1118                                 $last = $sk->linkKnown(
1119                                         $titleObj,
1120                                         wfMsgHtml('diff'),
1121                                         array(),
1122                                         array(
1123                                                 'target' => $this->mTargetObj->getPrefixedText(),
1124                                                 'timestamp' => $ts,
1125                                                 'diff' => 'prev'
1126                                         )
1127                                 );
1128                         } else {
1129                                 $last = wfMsgHtml('diff');
1130                         }
1131                 } else {
1132                         $checkBox = '';
1133                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1134                         $last = wfMsgHtml('diff');
1135                 }
1136                 $userLink = $sk->revUserTools( $rev );
1137
1138                 if(!is_null($size = $row->ar_len)) {
1139                         $stxt = $sk->formatRevisionSize( $size );
1140                 }
1141                 $comment = $sk->revComment( $rev );
1142                 $revdlink = '';
1143                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1144                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1145                         // If revision was hidden from sysops
1146                                 $revdlink = Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ),
1147                                         '('.wfMsgHtml('rev-delundel').')' );
1148                         } else {
1149                                 $query = array(
1150                                         'type' => 'archive',
1151                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1152                                         'ids' => $ts
1153                                 );
1154                                 $revdlink = $sk->revDeleteLink( $query, $rev->isDeleted( Revision::DELETED_RESTRICTED ) );
1155                         }
1156                 }
1157
1158                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1159         }
1160
1161         private function formatFileRow( $row, $sk ) {
1162                 global $wgUser, $wgLang;
1163
1164                 $file = ArchivedFile::newFromRow( $row );
1165
1166                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1167                 if( $this->mAllowed && $row->fa_storage_key ) {
1168                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1169                         $key = urlencode( $row->fa_storage_key );
1170                         $target = urlencode( $this->mTarget );
1171                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1172                         $pageLink = $this->getFileLink( $file, $titleObj, $ts, $key, $sk );
1173                 } else {
1174                         $checkBox = '';
1175                         $pageLink = $wgLang->timeanddate( $ts, true );
1176                 }
1177                 $userLink = $this->getFileUser( $file, $sk );
1178                 $data =
1179                         wfMsg( 'widthheight',
1180                                 $wgLang->formatNum( $row->fa_width ),
1181                                 $wgLang->formatNum( $row->fa_height ) ) .
1182                         ' (' .
1183                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1184                         ')';
1185                 $data = htmlspecialchars( $data );
1186                 $comment = $this->getFileComment( $file, $sk );
1187                 $revdlink = '';
1188                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1189                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1190                         // If revision was hidden from sysops
1191                                 $revdlink = Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ), '('.wfMsgHtml('rev-delundel').')' );
1192                         } else {
1193                                 $query = array(
1194                                         'type' => 'filearchive',
1195                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1196                                         'ids' => $row->fa_id
1197                                 );
1198                                 $revdlink = $sk->revDeleteLink( $query, $file->isDeleted( File::DELETED_RESTRICTED ) );
1199                         }
1200                 }
1201                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1202         }
1203
1204         /**
1205          * Fetch revision text link if it's available to all users
1206          * @return string
1207          */
1208         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1209                 global $wgLang;
1210
1211                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1212
1213                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1214                         return '<span class="history-deleted">' . $time . '</span>';
1215                 } else {
1216                         $link = $sk->linkKnown(
1217                                 $titleObj,
1218                                 $time,
1219                                 array(),
1220                                 array(
1221                                         'target' => $this->mTargetObj->getPrefixedText(),
1222                                         'timestamp' => $ts
1223                                 )
1224                         );
1225                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1226                                 $link = '<span class="history-deleted">' . $link . '</span>';
1227                         return $link;
1228                 }
1229         }
1230
1231         /**
1232          * Fetch image view link if it's available to all users
1233          * @return string
1234          */
1235         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1236                 global $wgLang, $wgUser;
1237
1238                 if( !$file->userCan(File::DELETED_FILE) ) {
1239                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1240                 } else {
1241                         $link = $sk->linkKnown(
1242                                 $titleObj,
1243                                 $wgLang->timeanddate( $ts, true ),
1244                                 array(),
1245                                 array(
1246                                         'target' => $this->mTargetObj->getPrefixedText(),
1247                                         'file' => $key,
1248                                         'token' => $wgUser->editToken( $key )
1249                                 )
1250                         );
1251                         if( $file->isDeleted(File::DELETED_FILE) )
1252                                 $link = '<span class="history-deleted">' . $link . '</span>';
1253                         return $link;
1254                 }
1255         }
1256
1257         /**
1258          * Fetch file's user id if it's available to this user
1259          * @return string
1260          */
1261         function getFileUser( $file, $sk ) {
1262                 if( !$file->userCan(File::DELETED_USER) ) {
1263                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1264                 } else {
1265                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1266                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1267                         if( $file->isDeleted(File::DELETED_USER) )
1268                                 $link = '<span class="history-deleted">' . $link . '</span>';
1269                         return $link;
1270                 }
1271         }
1272
1273         /**
1274          * Fetch file upload comment if it's available to this user
1275          * @return string
1276          */
1277         function getFileComment( $file, $sk ) {
1278                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1279                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1280                 } else {
1281                         $link = $sk->commentBlock( $file->getRawDescription() );
1282                         if( $file->isDeleted(File::DELETED_COMMENT) )
1283                                 $link = '<span class="history-deleted">' . $link . '</span>';
1284                         return $link;
1285                 }
1286         }
1287
1288         function undelete() {
1289                 global $wgOut, $wgUser;
1290                 if ( wfReadOnly() ) {
1291                         $wgOut->readOnlyPage();
1292                         return;
1293                 }
1294                 if( !is_null( $this->mTargetObj ) ) {
1295                         $archive = new PageArchive( $this->mTargetObj );
1296                         $ok = $archive->undelete(
1297                                 $this->mTargetTimestamp,
1298                                 $this->mComment,
1299                                 $this->mFileVersions,
1300                                 $this->mUnsuppress );
1301
1302                         if( is_array($ok) ) {
1303                                 if ( $ok[1] ) // Undeleted file count
1304                                         wfRunHooks( 'FileUndeleteComplete', array(
1305                                                 $this->mTargetObj, $this->mFileVersions,
1306                                                 $wgUser, $this->mComment) );
1307
1308                                 $skin = $wgUser->getSkin();
1309                                 $link = $skin->linkKnown( $this->mTargetObj );
1310                                 $wgOut->addHTML( wfMsgWikiHtml( 'undeletedpage', $link ) );
1311                         } else {
1312                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1313                                 $wgOut->addHTML( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1314                         }
1315
1316                         // Show file deletion warnings and errors
1317                         $status = $archive->getFileStatus();
1318                         if( $status && !$status->isGood() ) {
1319                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1320                         }
1321                 } else {
1322                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1323                 }
1324                 return false;
1325         }
1326 }