includes/SpecialUndelete.php

   1 <?php
   2
   3 /**
   4  * Special page allowing users with the appropriate permissions to view
   5  * and restore deleted content
   6  *
   7  * @addtogroup SpecialPage
   8  */
   9
  10 /**
  11  * Constructor
  12  */
  13 function wfSpecialUndelete( $par ) {
  14         global $wgRequest;
  15
  16         $form = new UndeleteForm( $wgRequest, $par );
  17         $form->execute();
  18 }
  19
  20 /**
  21  * Used to show archived pages and eventually restore them.
  22  * @addtogroup SpecialPage
  23  */
  24 class PageArchive {
  25         protected $title;
  26         var $fileStatus;
  27
  28         function __construct( $title ) {
  29                 if( is_null( $title ) ) {
  30                         throw new MWException( 'Archiver() given a null title.');
  31                 }
  32                 $this->title = $title;
  33         }
  34
  35         /**
  36          * List all deleted pages recorded in the archive table. Returns result
  37          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  38          * namespace/title.
  39          *
  40          * @return ResultWrapper
  41          */
  42         public static function listAllPages() {
  43                 $dbr = wfGetDB( DB_SLAVE );
  44                 return self::listPages( $dbr, '' );
  45         }
  46
  47         /**
  48          * List deleted pages recorded in the archive table matching the
  49          * given title prefix.
  50          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  51          *
  52          * @return ResultWrapper
  53          */
  54         public static function listPagesByPrefix( $prefix ) {
  55                 $dbr = wfGetDB( DB_SLAVE );
  56
  57                 $title = Title::newFromText( $prefix );
  58                 if( $title ) {
  59                         $ns = $title->getNamespace();
  60                         $encPrefix = $dbr->escapeLike( $title->getDbKey() );
  61                 } else {
  62                         // Prolly won't work too good
  63                         // @todo handle bare namespace names cleanly?
  64                         $ns = 0;
  65                         $encPrefix = $dbr->escapeLike( $prefix );
  66                 }
  67                 $conds = array(
  68                         'ar_namespace' => $ns,
  69                         "ar_title LIKE '$encPrefix%'",
  70                 );
  71                 return self::listPages( $dbr, $conds );
  72         }
  73
  74         protected static function listPages( $dbr, $condition ) {
  75                 return $dbr->resultObject(
  76                         $dbr->select(
  77                                 array( 'archive' ),
  78                                 array(
  79                                         'ar_namespace',
  80                                         'ar_title',
  81                                         'COUNT(*) AS count'
  82                                 ),
  83                                 $condition,
  84                                 __METHOD__,
  85                                 array(
  86                                         'GROUP BY' => 'ar_namespace,ar_title',
  87                                         'ORDER BY' => 'ar_namespace,ar_title',
  88                                         'LIMIT' => 100,
  89                                 )
  90                         )
  91                 );
  92         }
  93
  94         /**
  95          * List the deleted file revisions for this page, if it's a file page.
  96          * Returns a result wrapper with various filearchive fields, or null
  97          * if not a file page.
  98          *
  99          * @return ResultWrapper
 100          * @todo Does this belong in Image for fuller encapsulation?
 101          */
 102         function listFiles() {
 103                 if( $this->title->getNamespace() == NS_IMAGE ) {
 104                         $dbr = wfGetDB( DB_SLAVE );
 105                         $res = $dbr->select( 'filearchive',
 106                                 array(
 107                                         'fa_id',
 108                                         'fa_name',
 109                                         'fa_archive_name',
 110                                         'fa_storage_key',
 111                                         'fa_storage_group',
 112                                         'fa_size',
 113                                         'fa_width',
 114                                         'fa_height',
 115                                         'fa_bits',
 116                                         'fa_metadata',
 117                                         'fa_media_type',
 118                                         'fa_major_mime',
 119                                         'fa_minor_mime',
 120                                         'fa_description',
 121                                         'fa_user',
 122                                         'fa_user_text',
 123                                         'fa_timestamp',
 124                                         'fa_deleted' ),
 125                                 array( 'fa_name' => $this->title->getDbKey() ),
 126                                 __METHOD__,
 127                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 128                         $ret = $dbr->resultObject( $res );
 129                         return $ret;
 130                 }
 131                 return null;
 132         }
 133
 134         /**
 135          * Fetch (and decompress if necessary) the stored text for the deleted
 136          * revision of the page with the given timestamp.
 137          *
 138          * @return string
 139          * @deprecated Use getRevision() for more flexible information
 140          */
 141         function getRevisionText( $timestamp ) {
 142                 $rev = $this->getRevision( $timestamp );
 143                 return $rev ? $rev->getText() : null;
 144         }
 145
 146         function getRevisionConds( $timestamp, $id ) {
 147                 if( $id ) {
 148                         $id = intval($id);
 149                         return "ar_rev_id=$id";
 150                 } else if( $timestamp ) {
 151                         return "ar_timestamp=$timestamp";
 152                 } else {
 153                         return 'ar_rev_id=0';
 154                 }
 155         }
 156
 157         /**
 158          * Return a Revision object containing data for the deleted revision.
 159          * Note that the result *may* have a null page ID.
 160          * @param string $timestamp or $id
 161          * @return Revision
 162          */
 163         function getRevision( $timestamp, $id=null ) {
 164                 $dbr = wfGetDB( DB_SLAVE );
 165                 $row = $dbr->selectRow( 'archive',
 166                         array(
 167                                 'ar_rev_id',
 168                                 'ar_text',
 169                                 'ar_comment',
 170                                 'ar_user',
 171                                 'ar_user_text',
 172                                 'ar_timestamp',
 173                                 'ar_minor_edit',
 174                                 'ar_flags',
 175                                 'ar_text_id',
 176                                 'ar_deleted',
 177                                 'ar_len' ),
 178                         array( 'ar_namespace' => $this->title->getNamespace(),
 179                                'ar_title' => $this->title->getDbkey(),
 180                                $this->getRevisionConds( $dbr->timestamp($timestamp), $id ) ),
 181                         __METHOD__ );
 182                 if( $row ) {
 183                         return new Revision( array(
 184                                 'page'       => $this->title->getArticleId(),
 185                                 'id'         => $row->ar_rev_id,
 186                                 'text'       => ($row->ar_text_id
 187                                         ? null
 188                                         : Revision::getRevisionText( $row, 'ar_' ) ),
 189                                 'comment'    => $row->ar_comment,
 190                                 'user'       => $row->ar_user,
 191                                 'user_text'  => $row->ar_user_text,
 192                                 'timestamp'  => $row->ar_timestamp,
 193                                 'minor_edit' => $row->ar_minor_edit,
 194                                 'text_id'    => $row->ar_text_id,
 195                                 'deleted'    => $row->ar_deleted,
 196                                 'len'        => $row->ar_len) );
 197                 } else {
 198                         return null;
 199                 }
 200         }
 201
 202         /**
 203          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 204          */
 205         function getTextFromRow( $row ) {
 206                 if( is_null( $row->ar_text_id ) ) {
 207                         // An old row from MediaWiki 1.4 or previous.
 208                         // Text is embedded in this row in classic compression format.
 209                         return Revision::getRevisionText( $row, "ar_" );
 210                 } else {
 211                         // New-style: keyed to the text storage backend.
 212                         $dbr = wfGetDB( DB_SLAVE );
 213                         $text = $dbr->selectRow( 'text',
 214                                 array( 'old_text', 'old_flags' ),
 215                                 array( 'old_id' => $row->ar_text_id ),
 216                                 __METHOD__ );
 217                         return Revision::getRevisionText( $text );
 218                 }
 219         }
 220
 221
 222         /**
 223          * Fetch (and decompress if necessary) the stored text of the most
 224          * recently edited deleted revision of the page.
 225          *
 226          * If there are no archived revisions for the page, returns NULL.
 227          *
 228          * @return string
 229          */
 230         function getLastRevisionText() {
 231                 $dbr = wfGetDB( DB_SLAVE );
 232                 $row = $dbr->selectRow( 'archive',
 233                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 234                         array( 'ar_namespace' => $this->title->getNamespace(),
 235                                'ar_title' => $this->title->getDBkey() ),
 236                         'PageArchive::getLastRevisionText',
 237                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 238                 if( $row ) {
 239                         return $this->getTextFromRow( $row );
 240                 } else {
 241                         return NULL;
 242                 }
 243         }
 244
 245         /**
 246          * Quick check if any archived revisions are present for the page.
 247          * @return bool
 248          */
 249         function isDeleted() {
 250                 $dbr = wfGetDB( DB_SLAVE );
 251                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 252                         array( 'ar_namespace' => $this->title->getNamespace(),
 253                                'ar_title' => $this->title->getDBkey() ) );
 254                 return ($n > 0);
 255         }
 256
 257         /**
 258          * Restore the given (or all) text and file revisions for the page.
 259          * Once restored, the items will be removed from the archive tables.
 260          * The deletion log will be updated with an undeletion notice.
 261          * Use -1 for the one of the timestamps to only restore files or text
 262          *
 263          * @param string $pagetimestamp, restore all revisions since this time
 264          * @param string $comment
 265          * @param string $filetimestamp, restore all revision from this time on
 266          * @param bool $Unsuppress
 267          *
 268          * @return true on success.
 269          */
 270         function undelete( $pagetimestamp = 0, $comment = '', $filetimestamp = 0, $Unsuppress = false) {
 271                 // If both the set of text revisions and file revisions are empty,
 272                 // restore everything. Otherwise, just restore the requested items.
 273                 $restoreAll = ($pagetimestamp==0 && $filetimestamp==0);
 274
 275                 $restoreText = ($restoreAll || $pagetimestamp );
 276                 $restoreFiles = ($restoreAll || $filetimestamp );
 277
 278                 if( $restoreText && $pagetimestamp >= 0 ) {
 279                         $textRestored = $this->undeleteRevisions( $pagetimestamp, $Unsuppress );
 280                 } else {
 281                         $textRestored = 0;
 282                 }
 283
 284                 if( $restoreFiles && $filetimestamp >= 0 && $this->title->getNamespace()==NS_IMAGE ) {
 285                         $img = wfLocalFile( $this->title );
 286                         $this->fileStatus = $img->restore( $filetimestamp, $Unsuppress );
 287                         $filesRestored = $this->fileStatus->successCount;
 288                 } else {
 289                         $filesRestored = 0;
 290                 }
 291
 292                 // Touch the log!
 293                 global $wgContLang;
 294                 $log = new LogPage( 'delete' );
 295
 296                 if( $textRestored && $filesRestored ) {
 297                         $reason = wfMsgExt( 'undeletedrevisions-files', array('parsemag'),
 298                                 $wgContLang->formatNum( $textRestored ),
 299                                 $wgContLang->formatNum( $filesRestored ) );
 300                 } elseif( $textRestored ) {
 301                         $reason = wfMsgExt( 'undeletedrevisions', array('parsemag'),
 302                                 $wgContLang->formatNum( $textRestored ) );
 303                 } elseif( $filesRestored ) {
 304                         $reason = wfMsgExt( 'undeletedfiles', array('parsemag'),
 305                                 $wgContLang->formatNum( $filesRestored ) );
 306                 } else {
 307                         wfDebug( "Undelete: nothing undeleted...\n" );
 308                         return false;
 309                 }
 310
 311                 if( trim( $comment ) != '' )
 312                         $reason .= ": {$comment}";
 313                 $log->addEntry( 'restore', $this->title, $reason, array($pagetimestamp,$filetimestamp) );
 314
 315                 if ( $this->fileStatus && !$this->fileStatus->ok ) {
 316                         return false;
 317                 } else {
 318                         return true;
 319                 }
 320         }
 321
 322         /**
 323          * This is the meaty bit -- restores archived revisions of the given page
 324          * to the cur/old tables. If the page currently exists, all revisions will
 325          * be stuffed into old, otherwise the most recent will go into cur.
 326          *
 327          * @param string $timestamps, restore all revisions since this time
 328          * @param string $comment
 329          * @param array $fileVersions
 330          * @param bool $Unsuppress, remove all ar_deleted/fa_deleted restrictions of seletected revs
 331          *
 332          * @return int number of revisions restored
 333          */
 334         private function undeleteRevisions( $timestamp, $Unsuppress = false ) {
 335                 $restoreAll = ($timestamp==0);
 336
 337                 $dbw = wfGetDB( DB_MASTER );
 338                 $makepage = false; // Do we need to make a new page?
 339
 340                 # Does this page already exist? We'll have to update it...
 341                 $article = new Article( $this->title );
 342                 $options = 'FOR UPDATE';
 343                 $page = $dbw->selectRow( 'page',
 344                         array( 'page_id', 'page_latest' ),
 345                         array( 'page_namespace' => $this->title->getNamespace(),
 346                                 'page_title' => $this->title->getDBkey() ),
 347                         __METHOD__,
 348                         $options );
 349
 350                 if( $page ) {
 351                         # Page already exists. Import the history, and if necessary
 352                         # we'll update the latest revision field in the record.
 353                         $newid             = 0;
 354                         $pageId            = $page->page_id;
 355                         $previousRevId     = $page->page_latest;
 356                         # Get the time span of this page
 357                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 358                                 array( 'rev_id' => $previousRevId ),
 359                                 __METHOD__ );
 360
 361                         if( $previousTimestamp === false ) {
 362                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 363                                 return false;
 364                         }
 365                         # Do not fuck up histories by merging them in annoying, unrevertable ways
 366                         # This page id should match any deleted ones (excepting NULL values)
 367                         # We can allow restoration into redirect pages with no edit history
 368                         $otherpages = $dbw->selectField( 'archive', 'COUNT(*)',
 369                                 array( 'ar_namespace' => $this->title->getNamespace(),
 370                                         'ar_title' => $this->title->getDBkey(),
 371                                         'ar_page_id IS NOT NULL', "ar_page_id != $pageId" ),
 372                                 __METHOD__,
 373                                 array('LIMIT' => 1) );
 374                         if( $otherpages && !$this->title->isValidRestoreOverTarget() ) {
 375                                 return false;
 376                         }
 377
 378                 } else {
 379                         # Have to create a new article...
 380                         $makepage = true;
 381                         $previousRevId = 0;
 382                         $previousTimestamp = 0;
 383                 }
 384
 385                 $conditions = array(
 386                         'ar_namespace' => $this->title->getNamespace(),
 387                         'ar_title' => $this->title->getDBkey() );
 388                 if( $timestamp ) {
 389                         $conditions[] = "ar_timestamp >= {$timestamp}";
 390                 }
 391
 392                 /**
 393                  * Select each archived revision...
 394                  */
 395                 $result = $dbw->select( 'archive',
 396                         /* fields */ array(
 397                                 'ar_rev_id',
 398                                 'ar_text',
 399                                 'ar_comment',
 400                                 'ar_user',
 401                                 'ar_user_text',
 402                                 'ar_timestamp',
 403                                 'ar_minor_edit',
 404                                 'ar_flags',
 405                                 'ar_text_id',
 406                                 'ar_deleted',
 407                                 'ar_len' ),
 408                         /* WHERE */
 409                                 $conditions,
 410                         __METHOD__,
 411                         /* options */ array(
 412                                 'ORDER BY' => 'ar_timestamp' )
 413                         );
 414                 $ret = $dbw->resultObject( $result );
 415
 416                 $rev_count = $dbw->numRows( $result );
 417                 if( $rev_count ) {
 418                         # We need to seek around as just using DESC in the ORDER BY
 419                         # would leave the revisions inserted in the wrong order
 420                         $first = $ret->fetchObject();
 421                         $ret->seek( $rev_count - 1 );
 422                         $last = $ret->fetchObject();
 423                         // We don't handle well changing the top revision's settings
 424                         if( !$Unsuppress && $last->ar_deleted && $last->ar_timestamp > $previousTimestamp ) {
 425                                 wfDebug( __METHOD__.": restoration would result in a deleted top revision\n" );
 426                                 return false;
 427                         }
 428                         $ret->seek( 0 );
 429                 }
 430
 431                 if( $makepage ) {
 432                         $newid  = $article->insertOn( $dbw );
 433                         $pageId = $newid;
 434                 }
 435
 436                 $revision = null;
 437                 $restored = 0;
 438
 439                 while( $row = $ret->fetchObject() ) {
 440                         if( $row->ar_text_id ) {
 441                                 // Revision was deleted in 1.5+; text is in
 442                                 // the regular text table, use the reference.
 443                                 // Specify null here so the so the text is
 444                                 // dereferenced for page length info if needed.
 445                                 $revText = null;
 446                         } else {
 447                                 // Revision was deleted in 1.4 or earlier.
 448                                 // Text is squashed into the archive row, and
 449                                 // a new text table entry will be created for it.
 450                                 $revText = Revision::getRevisionText( $row, 'ar_' );
 451                         }
 452                         $revision = new Revision( array(
 453                                 'page'       => $pageId,
 454                                 'id'         => $row->ar_rev_id,
 455                                 'text'       => $revText,
 456                                 'comment'    => $row->ar_comment,
 457                                 'user'       => $row->ar_user,
 458                                 'user_text'  => $row->ar_user_text,
 459                                 'timestamp'  => $row->ar_timestamp,
 460                                 'minor_edit' => $row->ar_minor_edit,
 461                                 'text_id'    => $row->ar_text_id,
 462                                 'deleted'        => $Unsuppress ? 0 : $row->ar_deleted,
 463                                 'len'        => $row->ar_len
 464                                 ) );
 465                         $revision->insertOn( $dbw );
 466                         $restored++;
 467                 }
 468
 469                 # If there were any revisions restored...
 470                 if( $revision ) {
 471                         // Attach the latest revision to the page...
 472                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 473
 474                         if( $newid || $wasnew ) {
 475                                 // Update site stats, link tables, etc
 476                                 $article->createUpdates( $revision );
 477                         }
 478
 479                         if( $newid ) {
 480                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true ) );
 481                                 Article::onArticleCreate( $this->title );
 482                         } else {
 483                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false ) );
 484                                 Article::onArticleEdit( $this->title );
 485                         }
 486                 }
 487
 488                 # Now that it's safely stored, take it out of the archive
 489                 $dbw->delete( 'archive',
 490                         /* WHERE */
 491                         $conditions,
 492                         __METHOD__ );
 493                 # Update any revision left to reflect the page they belong to.
 494                 # If a page was deleted, and a new one created over it, then deleted,
 495                 # selective restore acts as a way to seperate the two. Nevertheless, we
 496                 # still want the rest to be restorable, in case some mistake was made.
 497                 $dbw->update( 'archive',
 498                         array( 'ar_page_id' => $newid ),
 499                         array( 'ar_namespace' => $this->title->getNamespace(),
 500                                         'ar_title' => $this->title->getDBkey() ),
 501                         __METHOD__ );
 502
 503                 return $restored;
 504         }
 505
 506         function getFileStatus() { return $this->fileStatus; }
 507 }
 508
 509 /**
 510  * The HTML form for Special:Undelete, which allows users with the appropriate
 511  * permissions to view and restore deleted content.
 512  * @addtogroup SpecialPage
 513  */
 514 class UndeleteForm {
 515         var $mAction, $mTarget, $mTimestamp, $mRestore, $mTargetObj;
 516         var $mTargetTimestamp, $mAllowed, $mComment;
 517
 518         function UndeleteForm( $request, $par = "" ) {
 519                 global $wgUser;
 520                 $this->mAction = $request->getVal( 'action' );
 521                 $this->mTarget = $request->getVal( 'target' );
 522                 $this->mSearchPrefix = $request->getText( 'prefix' );
 523                 $time = $request->getVal( 'timestamp' );
 524                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 525                 $this->mFile = $request->getVal( 'file' );
 526                 $this->mDiff = $request->getVal( 'diff' );
 527                 $this->mOldid = $request->getVal( 'oldid' );
 528
 529                 $posted = $request->wasPosted() && $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 530                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 531                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 532                 $this->mComment = $request->getText( 'wpComment' );
 533                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'oversight' );
 534
 535                 if( $par != "" ) {
 536                         $this->mTarget = $par;
 537                         $_GET['target'] = $par; // hack for Pager
 538                 }
 539                 if( $wgUser->isAllowed( 'delete' ) && !$wgUser->isBlocked() ) {
 540                         $this->mAllowed = true;
 541                 } else {
 542                         $this->mAllowed = false;
 543                         $this->mTimestamp = '';
 544                         $this->mRestore = false;
 545                 }
 546                 if( $this->mTarget !== "" ) {
 547                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 548                 } else {
 549                         $this->mTargetObj = NULL;
 550                 }
 551                 if( $this->mRestore ) {
 552                         $this->mFileTimestamp = $request->getVal('imgrestorepoint');
 553                         $this->mPageTimestamp = $request->getVal('restorepoint');
 554                 }
 555                 $this->preCacheMessages();
 556         }
 557
 558         /**
 559          * As we use the same small set of messages in various methods and that
 560          * they are called often, we call them once and save them in $this->message
 561          */
 562         function preCacheMessages() {
 563                 // Precache various messages
 564                 if( !isset( $this->message ) ) {
 565                         foreach( explode(' ', 'last rev-delundel' ) as $msg ) {
 566                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escape') );
 567                         }
 568                 }
 569         }
 570
 571         function execute() {
 572                 global $wgOut, $wgUser;
 573                 if( $this->mAllowed ) {
 574                         $wgOut->setPagetitle( wfMsgHtml( "undeletepage" ) );
 575                 } else {
 576                         $wgOut->setPagetitle( wfMsgHtml( "viewdeletedpage" ) );
 577                 }
 578
 579                 if( is_null( $this->mTargetObj ) ) {
 580                 # Not all users can just browse every deleted page from the list
 581                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 582                                 $this->showSearchForm();
 583
 584                                 # List undeletable articles
 585                                 if( $this->mSearchPrefix ) {
 586                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 587                                         $this->showList( $result );
 588                                 }
 589                         } else {
 590                                 $wgOut->addWikiText( wfMsgHtml( 'undelete-header' ) );
 591                         }
 592                         return;
 593                 }
 594                 if( $this->mTimestamp !== '' ) {
 595                         return $this->showRevision( $this->mTimestamp );
 596                 }
 597
 598                 if( $this->mDiff && $this->mOldid )
 599                         return $this->showDiff( $this->mDiff, $this->mOldid );
 600
 601                 if( $this->mFile !== null ) {
 602                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 603                         // Check if user is allowed to see this file
 604                         if( !$file->userCan( File::DELETED_FILE ) ) {
 605                                 $wgOut->permissionRequired( 'hiderevision' );
 606                                 return false;
 607                         } else {
 608                                 return $this->showFile( $this->mFile );
 609                         }
 610                 }
 611
 612                 if( $this->mRestore && $this->mAction == "submit" ) {
 613                         return $this->undelete();
 614                 }
 615                 return $this->showHistory();
 616         }
 617
 618         function showSearchForm() {
 619                 global $wgOut, $wgScript;
 620                 $wgOut->addWikiText( wfMsg( 'undelete-header' ) );
 621
 622                 $wgOut->addHtml(
 623                         Xml::openElement( 'form', array(
 624                                 'method' => 'get',
 625                                 'action' => $wgScript ) ) .
 626                         '<fieldset>' .
 627                         Xml::element( 'legend', array(),
 628                                 wfMsg( 'undelete-search-box' ) ) .
 629                         Xml::hidden( 'title',
 630                                 SpecialPage::getTitleFor( 'Undelete' )->getPrefixedDbKey() ) .
 631                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 632                                 'prefix', 'prefix', 20,
 633                                 $this->mSearchPrefix ) .
 634                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 635                         '</fieldset>' .
 636                         '</form>' );
 637         }
 638
 639         // Generic list of deleted pages
 640         private function showList( $result ) {
 641                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 642
 643                 if( $result->numRows() == 0 ) {
 644                         $wgOut->addWikiText( wfMsg( 'undelete-no-results' ) );
 645                         return;
 646                 }
 647
 648                 $wgOut->addWikiText( wfMsg( "undeletepagetext" ) );
 649
 650                 $sk = $wgUser->getSkin();
 651                 $undelete = SpecialPage::getTitleFor( 'Undelete' );
 652                 $wgOut->addHTML( "<ul>\n" );
 653                 while( $row = $result->fetchObject() ) {
 654                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 655                         $link = $sk->makeKnownLinkObj( $undelete, htmlspecialchars( $title->getPrefixedText() ), 'target=' . $title->getPrefixedUrl() );
 656                         #$revs = wfMsgHtml( 'undeleterevisions', $wgLang->formatNum( $row->count ) );
 657                         $revs = wfMsgExt( 'undeleterevisions',
 658                                 array( 'parseinline' ),
 659                                 $wgLang->formatNum( $row->count ) );
 660                         $wgOut->addHtml( "<li>{$link} ({$revs})</li>\n" );
 661                 }
 662                 $result->free();
 663                 $wgOut->addHTML( "</ul>\n" );
 664
 665                 return true;
 666         }
 667
 668         private function showRevision( $timestamp ) {
 669                 global $wgLang, $wgUser, $wgOut;
 670                 $self = SpecialPage::getTitleFor( 'Undelete' );
 671                 $skin = $wgUser->getSkin();
 672
 673                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 674
 675                 $archive = new PageArchive( $this->mTargetObj );
 676                 $rev = $archive->getRevision( $timestamp );
 677
 678                 if( !$rev ) {
 679                         $wgOut->addWikiText( wfMsg( 'undeleterevision-missing' ) );
 680                         return;
 681                 }
 682
 683                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 684                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 685                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 686                                 return;
 687                         } else {
 688                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 689                                 $wgOut->addHTML( '<br/>' );
 690                                 // and we are allowed to see...
 691                         }
 692                 }
 693
 694                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 695
 696                 $link = $skin->makeKnownLinkObj( $self,
 697                         htmlspecialchars( $this->mTargetObj->getPrefixedText() ),
 698                         'target=' . $this->mTargetObj->getPrefixedUrl()
 699                 );
 700                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp ) );
 701                 $user = $skin->userLink( $rev->getUser(), $rev->getUserText() )
 702                         . $skin->userToolLinks( $rev->getUser(), $rev->getUserText() );
 703
 704                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'undelete-revision', $link, $time, $user ) . '</p>' );
 705
 706                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 707
 708                 if( $this->mPreview ) {
 709                         $wgOut->addHtml( "<hr />\n" );
 710                         $wgOut->addWikiTextTitleTidy( $rev->revText(), $this->mTargetObj, false );
 711                 }
 712
 713                 $wgOut->addHtml(
 714                         wfElement( 'textarea', array(
 715                                         'readonly' => 'readonly',
 716                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 717                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 718                                 $rev->revText() . "\n" ) .
 719                         wfOpenElement( 'div' ) .
 720                         wfOpenElement( 'form', array(
 721                                 'method' => 'post',
 722                                 'action' => $self->getLocalURL( "action=submit" ) ) ) .
 723                         wfElement( 'input', array(
 724                                 'type' => 'hidden',
 725                                 'name' => 'target',
 726                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 727                         wfElement( 'input', array(
 728                                 'type' => 'hidden',
 729                                 'name' => 'timestamp',
 730                                 'value' => $timestamp ) ) .
 731                         wfElement( 'input', array(
 732                                 'type' => 'hidden',
 733                                 'name' => 'wpEditToken',
 734                                 'value' => $wgUser->editToken() ) ) .
 735                         wfElement( 'input', array(
 736                                 'type' => 'hidden',
 737                                 'name' => 'preview',
 738                                 'value' => '1' ) ) .
 739                         wfElement( 'input', array(
 740                                 'type' => 'submit',
 741                                 'value' => wfMsg( 'showpreview' ) ) ) .
 742                         wfCloseElement( 'form' ) .
 743                         wfCloseElement( 'div' ) );
 744         }
 745
 746         /**
 747          * Show the changes between two deleted revisions
 748          */
 749         private function showDiff( $newid, $oldid ) {
 750                 global $wgOut, $wgUser, $wgLang;
 751
 752                 if( is_null($this->mTargetObj) )
 753                         return;
 754                 $skin = $wgUser->getSkin();
 755
 756                 $archive = new PageArchive( $this->mTargetObj );
 757                 $oldRev = $archive->getRevision( null, $oldid );
 758                 $newRev = $archive->getRevision( null, $newid );
 759
 760                 if( !$oldRev || !$newRev )
 761                         return;
 762
 763                 $oldTitle = $this->mTargetObj->getPrefixedText();
 764                 $wgOut->addHtml( "<center><h3>$oldTitle</h3></center>" );
 765
 766                 $oldminor = $newminor = '';
 767
 768                 if($oldRev->mMinorEdit == 1) {
 769                         $oldminor = wfElement( 'span', array( 'class' => 'minor' ),
 770                                 wfMsg( 'minoreditletter') ) . ' ';
 771                 }
 772
 773                 if($newRev->mMinorEdit == 1) {
 774                         $newminor = wfElement( 'span', array( 'class' => 'minor' ),
 775                         wfMsg( 'minoreditletter') ) . ' ';
 776                 }
 777
 778                 $ot = $wgLang->timeanddate( $oldRev->getTimestamp(), true );
 779                 $nt = $wgLang->timeanddate( $newRev->getTimestamp(), true );
 780                 $oldHeader = htmlspecialchars( wfMsg( 'revisionasof', $ot ) ) . "<br />" .
 781                         $skin->revUserTools( $oldRev, true ) . "<br />" .
 782                         $oldminor . $skin->revComment( $oldRev, false ) . "<br />";
 783                 $newHeader = htmlspecialchars( wfMsg( 'revisionasof', $nt ) ) . "<br />" .
 784                         $skin->revUserTools( $newRev, true ) . " <br />" .
 785                         $newminor . $skin->revComment( $newRev, false ) . "<br />";
 786
 787                 $otext = $oldRev->revText();
 788                 $ntext = $newRev->revText();
 789
 790                 $wgOut->addStyle( 'common/diff.css' );
 791         $wgOut->addHtml(
 792             "<div>" .
 793             "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 794             "<col class='diff-marker' />" .
 795             "<col class='diff-content' />" .
 796             "<col class='diff-marker' />" .
 797             "<col class='diff-content' />" .
 798             "<tr>" .
 799                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" . $oldHeader . "</td>" .
 800                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" . $newHeader . "</td>" .
 801             "</tr>" .
 802             DifferenceEngine::generateDiffBody( $otext, $ntext ) .
 803             "</table>" .
 804             "</div>\n" );
 805
 806                 return true;
 807         }
 808
 809         /**
 810          * Show a deleted file version requested by the visitor.
 811          */
 812         private function showFile( $key ) {
 813                 global $wgOut, $wgRequest;
 814                 $wgOut->disable();
 815
 816                 # We mustn't allow the output to be Squid cached, otherwise
 817                 # if an admin previews a deleted image, and it's cached, then
 818                 # a user without appropriate permissions can toddle off and
 819                 # nab the image, and Squid will serve it
 820                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 821                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 822                 $wgRequest->response()->header( 'Pragma: no-cache' );
 823
 824                 $store = FileStore::get( 'deleted' );
 825                 $store->stream( $key );
 826         }
 827
 828         private function showHistory() {
 829                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 830
 831                 $this->sk = $wgUser->getSkin();
 832                 if( $this->mAllowed ) {
 833                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 834                 } else {
 835                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
 836                 }
 837
 838                 $wgOut->addWikiText( wfMsgHtml( 'undeletepagetitle', $this->mTargetObj->getPrefixedText()) );
 839
 840                 $archive = new PageArchive( $this->mTargetObj );
 841
 842                 if( $this->mAllowed ) {
 843                         $wgOut->addWikiText( '<p>' . wfMsgHtml( "undeletehistory" ) . '</p>' );
 844                         $wgOut->addHtml( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
 845                 } else {
 846                         $wgOut->addWikiText( wfMsgHtml( "undeletehistorynoadmin" ) );
 847                 }
 848
 849                 # List all stored revisions
 850                 $revisions = new UndeleteRevisionsPager( $this, array(), $this->mTargetObj );
 851                 $files = $archive->listFiles();
 852
 853                 $haveRevisions = $revisions && $revisions->getNumRows() > 0;
 854                 $haveFiles = $files && $files->numRows() > 0;
 855
 856                 # Batch existence check on user and talk pages
 857                 if( $haveFiles ) {
 858                         $batch = new LinkBatch();
 859                         while( $row = $files->fetchObject() ) {
 860                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
 861                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
 862                         }
 863                         $batch->execute();
 864                         $files->seek( 0 );
 865                 }
 866
 867                 if( $this->mAllowed ) {
 868                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
 869                         $action = $titleObj->getLocalURL( "action=submit" );
 870                         # Start the form here
 871                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
 872                         $wgOut->addHtml( $top );
 873                 }
 874
 875                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
 876                         # Format the user-visible controls (comment field, submission button)
 877                         # in a nice little table
 878                         $align = $wgContLang->isRtl() ? 'left' : 'right';
 879                         $table =
 880                                 Xml::openElement( 'fieldset' ) .
 881                                 Xml::openElement( 'table' ) .
 882                                         "<tr>
 883                                                 <td colspan='2'>" .
 884                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
 885                                                 "</td>
 886                                         </tr>
 887                                         <tr>
 888                                                 <td align='$align'>" .
 889                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
 890                                                 "</td>
 891                                                 <td>" .
 892                                                         Xml::input( 'wpComment', 50, $this->mComment ) .
 893                                                 "</td>
 894                                         </tr>
 895                                         <tr>
 896                                                 <td>&nbsp;</td>
 897                                                 <td>" .
 898                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) .
 899                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) .
 900                                                         Xml::openElement( 'p' ) .
 901                                                         Xml::check( 'wpUnsuppress', $this->mUnsuppress, array('id' => 'mw-undelete-unsupress') ) . ' ' .
 902                                                         Xml::label( wfMsgHtml('revdelete-unsuppress'), 'mw-undelete-unsupress' ) .
 903                                                         Xml::closeElement( 'p' ) .
 904                                                 "</td>
 905                                         </tr>" .
 906                                 Xml::closeElement( 'table' ) .
 907                                 Xml::closeElement( 'fieldset' );
 908
 909                         $wgOut->addHtml( $table );
 910                 }
 911
 912                 $wgOut->addHTML( "<h2 id=\"pagehistory\">" . wfMsgHtml( "history" ) . "</h2>\n" );
 913
 914                 if( $haveRevisions ) {
 915                         $wgOut->addHTML( '<p>' . wfMsgHtml( "restorepoint" ) . '</p>' );
 916                         $wgOut->addHTML( $revisions->getNavigationBar() );
 917                         $wgOut->addHTML( "<ul>" );
 918                         $wgOut->addHTML( "<li>" . wfRadio( "restorepoint", -1, false ) . " " . wfMsgHtml('restorenone') . "</li>" );
 919                         $wgOut->addHTML( $revisions->getBody() );
 920                         $wgOut->addHTML( "</ul>" );
 921                         $wgOut->addHTML( $revisions->getNavigationBar() );
 922                 } else {
 923                         $wgOut->addWikiText( wfMsg( "nohistory" ) );
 924                 }
 925                 if( $haveFiles ) {
 926                         $wgOut->addHtml( "<h2 id=\"filehistory\">" . wfMsgHtml( 'filehist' ) . "</h2>\n" );
 927                         $wgOut->addHTML( wfMsgHtml( "restorepoint" ) );
 928                         $wgOut->addHtml( "<ul>" );
 929                         $wgOut->addHTML( "<li>" . wfRadio( "imgrestorepoint", -1, false ) . " " . wfMsgHtml('restorenone') . "</li>" );
 930                         while( $row = $files->fetchObject() ) {
 931                                 $file = ArchivedFile::newFromRow( $row );
 932
 933                                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
 934                                 if( $this->mAllowed && $row->fa_storage_key ) {
 935                                         $checkBox = wfRadio( "imgrestorepoint", $ts, false );
 936                                         $key = urlencode( $row->fa_storage_key );
 937                                         $target = urlencode( $this->mTarget );
 938                                         $pageLink = $this->getFileLink( $file, $titleObj, $ts, $target, $key );
 939                                 } else {
 940                                         $checkBox = '';
 941                                         $pageLink = $wgLang->timeanddate( $ts, true );
 942                                 }
 943                                 $userLink = $this->getFileUser( $file );
 944                                 $data =
 945                                         wfMsgHtml( 'widthheight',
 946                                                 $wgLang->formatNum( $row->fa_width ),
 947                                                 $wgLang->formatNum( $row->fa_height ) ) .
 948                                         ' (' .
 949                                         wfMsgHtml( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
 950                                         ')';
 951                                 $comment = $this->getFileComment( $file );
 952                                 $rd='';
 953                                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 954                                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
 955                                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
 956                                         // If revision was hidden from sysops
 957                                                 $del = $this->message['rev-delundel'];
 958                                         } else {
 959                                                 $del = $this->sk->makeKnownLinkObj( $revdel,
 960                                                         $this->message['rev-delundel'],
 961                                                         'target=' . urlencode( $this->mTarget ) .
 962                                                         '&fileid=' . urlencode( $row->fa_id ) );
 963                                                 // Bolden oversighted content
 964                                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) )
 965                                                         $del = "<strong>$del</strong>";
 966                                         }
 967                                         $rd = "<tt>(<small>$del</small>)</tt>";
 968                                 }
 969                                 $wgOut->addHTML( "<li>$checkBox $rd $pageLink . . $userLink $data $comment</li>\n" );
 970                         }
 971                         $files->free();
 972                         $wgOut->addHTML( "</ul>" );
 973                 }
 974
 975                 # Show relevant lines from the deletion log:
 976                 $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'delete' ) ) . "</h2>\n" );
 977                 $logViewer = new LogViewer(
 978                         new LogReader(
 979                                 new FauxRequest(
 980                                         array( 'page' => $this->mTargetObj->getPrefixedText(),
 981                                                    'type' => 'delete' ) ) ) );
 982                 $logViewer->showList( $wgOut );
 983
 984                 if( $this->mAllowed ) {
 985                         # Slip in the hidden controls here
 986                         $misc  = Xml::hidden( 'target', $this->mTarget );
 987                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
 988                         $misc .= Xml::closeElement( 'form' );
 989                         $wgOut->addHtml( $misc );
 990                 }
 991
 992                 return true;
 993         }
 994
 995         function formatRevisionRow( $row ) {
 996                 global $wgUser, $wgLang;
 997
 998                 $rev = new Revision( array(
 999                                 'page'       => $this->mTargetObj->getArticleId(),
1000                                 'id'         => $row->ar_rev_id,
1001                                 'comment'    => $row->ar_comment,
1002                                 'user'       => $row->ar_user,
1003                                 'user_text'  => $row->ar_user_text,
1004                                 'timestamp'  => $row->ar_timestamp,
1005                                 'minor_edit' => $row->ar_minor_edit,
1006                                 'text_id'    => $row->ar_text_id,
1007                                 'deleted'    => $row->ar_deleted,
1008                                 'len'        => $row->ar_len) );
1009
1010                 $stxt = '';
1011                 $last = $this->message['last'];
1012
1013                 if( $this->mAllowed ) {
1014                         $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1015                         $checkBox = wfRadio( "restorepoint", $ts, false );
1016                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1017                         $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $this->mTarget );
1018                         # Last link
1019                         if( !$rev->userCan( Revision::DELETED_TEXT ) )
1020                                 $last = $this->message['last'];
1021                         else if( isset($this->prevId[$row->ar_rev_id]) )
1022                                 $last = $this->sk->makeKnownLinkObj( $titleObj, $this->message['last'], "target=" . $this->mTarget .
1023                                 "&diff=" . $row->ar_rev_id . "&oldid=" . $this->prevId[$row->ar_rev_id] );
1024                 } else {
1025                         $checkBox = '';
1026                         $pageLink = $wgLang->timeanddate( $ts, true );
1027                 }
1028                 $userLink = $this->sk->revUserTools( $rev );
1029
1030                 if(!is_null($size = $row->ar_len)) {
1031                         if($size == 0)
1032                                 $stxt = wfMsgHtml('historyempty');
1033                         else
1034                                 $stxt = wfMsgHtml('historysize', $wgLang->formatNum( $size ) );
1035                 }
1036                 $comment = $this->sk->revComment( $rev );
1037                 $revd='';
1038                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1039                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1040                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1041                         // If revision was hidden from sysops
1042                                 $del = $this->message['rev-delundel'];
1043                         } else {
1044                                 $del = $this->sk->makeKnownLinkObj( $revdel,
1045                                         $this->message['rev-delundel'],
1046                                         'target=' . urlencode( $this->mTarget ) .
1047                                         '&artimestamp=' . urlencode( $row->ar_timestamp ) );
1048                                 // Bolden oversighted content
1049                                 if( $rev->isDeleted( Revision::DELETED_RESTRICTED ) )
1050                                         $del = "<strong>$del</strong>";
1051                         }
1052                         $revd = "<tt>(<small>$del</small>)</tt>";
1053                 }
1054
1055                 return "<li>$checkBox $revd ($last) $pageLink . . $userLink $stxt $comment</li>";
1056         }
1057
1058         /**
1059          * Fetch revision text link if it's available to all users
1060          * @return string
1061          */
1062         function getPageLink( $rev, $titleObj, $ts, $target ) {
1063                 global $wgLang;
1064
1065                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1066                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1067                 } else {
1068                         $link = $this->sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ), "target=$target&timestamp=$ts" );
1069                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1070                                 $link = '<span class="history-deleted">' . $link . '</span>';
1071                         return $link;
1072                 }
1073         }
1074
1075         /**
1076          * Fetch image view link if it's available to all users
1077          * @return string
1078          */
1079         function getFileLink( $file, $titleObj, $ts, $target, $key ) {
1080                 global $wgLang;
1081
1082                 if( !$file->userCan(File::DELETED_FILE) ) {
1083                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1084                 } else {
1085                         $link = $this->sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ), "target=$target&file=$key" );
1086                         if( $file->isDeleted(File::DELETED_FILE) )
1087                                 $link = '<span class="history-deleted">' . $link . '</span>';
1088                         return $link;
1089                 }
1090         }
1091
1092         /**
1093          * Fetch file's user id if it's available to this user
1094          * @return string
1095          */
1096         function getFileUser( $file ) {
1097                 if( !$file->userCan(File::DELETED_USER) ) {
1098                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1099                 } else {
1100                         $link = $this->sk->userLink( $file->user, $file->userText ) .
1101                                 $this->sk->userToolLinks( $file->user, $file->userText );
1102                         if( $file->isDeleted(File::DELETED_USER) )
1103                                 $link = '<span class="history-deleted">' . $link . '</span>';
1104                         return $link;
1105                 }
1106         }
1107
1108         /**
1109          * Fetch file upload comment if it's available to this user
1110          * @return string
1111          */
1112         function getFileComment( $file ) {
1113                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1114                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1115                 } else {
1116                         $link = $this->sk->commentBlock( $file->description );
1117                         if( $file->isDeleted(File::DELETED_COMMENT) )
1118                                 $link = '<span class="history-deleted">' . $link . '</span>';
1119                         return $link;
1120                 }
1121         }
1122
1123         function undelete() {
1124                 global $wgOut, $wgUser;
1125                 if( !is_null( $this->mTargetObj ) ) {
1126                         $archive = new PageArchive( $this->mTargetObj );
1127
1128                         $ok = $archive->undelete(
1129                                 $this->mPageTimestamp,
1130                                 $this->mComment,
1131                                 $this->mFileTimestamp,
1132                                 $this->mUnsuppress );
1133                         if( $ok ) {
1134                                 $skin = $wgUser->getSkin();
1135                                 $link = $skin->makeKnownLinkObj( $this->mTargetObj, $this->mTargetObj->getPrefixedText(), 'redirect=no' );
1136                                 $wgOut->addHtml( wfMsgWikiHtml( 'undeletedpage', $link ) );
1137                         } else {
1138                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1139                                 $wgOut->addHtml( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1140                         }
1141
1142                         // Show file deletion warnings and errors
1143                         $status = $archive->getFileStatus();
1144                         if ( $status && !$status->isGood() ) {
1145                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1146                         }
1147                 } else {
1148                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1149                 }
1150                 return false;
1151         }
1152 }
1153
1154 class UndeleteRevisionsPager extends ReverseChronologicalPager {
1155         public $mForm, $mConds;
1156
1157         function __construct( $form, $conds = array(), $title ) {
1158                 $this->mForm = $form;
1159                 $this->mConds = $conds;
1160                 $this->title = $title;
1161                 parent::__construct();
1162         }
1163
1164         function getStartBody() {
1165                 wfProfileIn( __METHOD__ );
1166                 # Do a link batch query
1167                 $this->mResult->seek( 0 );
1168                 $batch = new LinkBatch();
1169                 # Give some pointers to make (last) links
1170                 $this->mForm->prevId = array();
1171                 while( $row = $this->mResult->fetchObject() ) {
1172                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1173                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1174
1175                         $rev_id = isset($rev_id) ? $rev_id : $row->ar_rev_id;
1176                         if( $rev_id > $row->ar_rev_id )
1177                                 $this->mForm->prevId[$rev_id] = $row->ar_rev_id;
1178                         else if( $rev_id < $row->ar_rev_id )
1179                                 $this->mForm->prevId[$row->ar_rev_id] = $rev_id;
1180
1181                         $rev_id = $row->ar_rev_id;
1182                 }
1183
1184                 $batch->execute();
1185                 $this->mResult->seek( 0 );
1186
1187                 wfProfileOut( __METHOD__ );
1188                 return '';
1189         }
1190
1191         function formatRow( $row ) {
1192                 $block = new Block;
1193                 return $this->mForm->formatRevisionRow( $row );
1194         }
1195
1196         function getQueryInfo() {
1197                 $conds = $this->mConds;
1198                 $conds['ar_namespace'] = $this->title->getNamespace();
1199                 $conds['ar_title'] = $this->title->getDBkey();
1200                 return array(
1201                         'tables' => array('archive'),
1202                         'fields' => array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment',
1203                                 'ar_rev_id', 'ar_text_id', 'ar_len', 'ar_deleted' ),
1204                         'conds' => $conds
1205                 );
1206         }
1207
1208         function getIndexField() {
1209                 return 'ar_timestamp';
1210         }
1211 }