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_IMAGE ) {
 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 new Revision( array(
 192                                 'page'       => $this->title->getArticleId(),
 193                                 'id'         => $row->ar_rev_id,
 194                                 'text'       => ($row->ar_text_id
 195                                         ? null
 196                                         : Revision::getRevisionText( $row, 'ar_' ) ),
 197                                 'comment'    => $row->ar_comment,
 198                                 'user'       => $row->ar_user,
 199                                 'user_text'  => $row->ar_user_text,
 200                                 'timestamp'  => $row->ar_timestamp,
 201                                 'minor_edit' => $row->ar_minor_edit,
 202                                 'text_id'    => $row->ar_text_id,
 203                                 'deleted'    => $row->ar_deleted,
 204                                 'len'        => $row->ar_len) );
 205                 } else {
 206                         return null;
 207                 }
 208         }
 209
 210         /**
 211          * Return the most-previous revision, either live or deleted, against
 212          * the deleted revision given by timestamp.
 213          *
 214          * May produce unexpected results in case of history merges or other
 215          * unusual time issues.
 216          *
 217          * @param string $timestamp
 218          * @return Revision or null
 219          */
 220         function getPreviousRevision( $timestamp ) {
 221                 $dbr = wfGetDB( DB_SLAVE );
 222
 223                 // Check the previous deleted revision...
 224                 $row = $dbr->selectRow( 'archive',
 225                         'ar_timestamp',
 226                         array( 'ar_namespace' => $this->title->getNamespace(),
 227                                'ar_title' => $this->title->getDBkey(),
 228                                'ar_timestamp < ' .
 229                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 230                         __METHOD__,
 231                         array(
 232                                 'ORDER BY' => 'ar_timestamp DESC',
 233                                 'LIMIT' => 1 ) );
 234                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 235
 236                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 237                         array( 'rev_id', 'rev_timestamp' ),
 238                         array(
 239                                 'page_namespace' => $this->title->getNamespace(),
 240                                 'page_title' => $this->title->getDBkey(),
 241                                 'page_id = rev_page',
 242                                 'rev_timestamp < ' .
 243                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 244                         __METHOD__,
 245                         array(
 246                                 'ORDER BY' => 'rev_timestamp DESC',
 247                                 'LIMIT' => 1 ) );
 248                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 249                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 250
 251                 if( $prevLive && $prevLive > $prevDeleted ) {
 252                         // Most prior revision was live
 253                         return Revision::newFromId( $prevLiveId );
 254                 } elseif( $prevDeleted ) {
 255                         // Most prior revision was deleted
 256                         return $this->getRevision( $prevDeleted );
 257                 } else {
 258                         // No prior revision on this page.
 259                         return null;
 260                 }
 261         }
 262
 263         /**
 264          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 265          */
 266         function getTextFromRow( $row ) {
 267                 if( is_null( $row->ar_text_id ) ) {
 268                         // An old row from MediaWiki 1.4 or previous.
 269                         // Text is embedded in this row in classic compression format.
 270                         return Revision::getRevisionText( $row, "ar_" );
 271                 } else {
 272                         // New-style: keyed to the text storage backend.
 273                         $dbr = wfGetDB( DB_SLAVE );
 274                         $text = $dbr->selectRow( 'text',
 275                                 array( 'old_text', 'old_flags' ),
 276                                 array( 'old_id' => $row->ar_text_id ),
 277                                 __METHOD__ );
 278                         return Revision::getRevisionText( $text );
 279                 }
 280         }
 281
 282
 283         /**
 284          * Fetch (and decompress if necessary) the stored text of the most
 285          * recently edited deleted revision of the page.
 286          *
 287          * If there are no archived revisions for the page, returns NULL.
 288          *
 289          * @return string
 290          */
 291         function getLastRevisionText() {
 292                 $dbr = wfGetDB( DB_SLAVE );
 293                 $row = $dbr->selectRow( 'archive',
 294                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 295                         array( 'ar_namespace' => $this->title->getNamespace(),
 296                                'ar_title' => $this->title->getDBkey() ),
 297                         'PageArchive::getLastRevisionText',
 298                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 299                 if( $row ) {
 300                         return $this->getTextFromRow( $row );
 301                 } else {
 302                         return NULL;
 303                 }
 304         }
 305
 306         /**
 307          * Quick check if any archived revisions are present for the page.
 308          * @return bool
 309          */
 310         function isDeleted() {
 311                 $dbr = wfGetDB( DB_SLAVE );
 312                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 313                         array( 'ar_namespace' => $this->title->getNamespace(),
 314                                'ar_title' => $this->title->getDBkey() ) );
 315                 return ($n > 0);
 316         }
 317
 318         /**
 319          * Restore the given (or all) text and file revisions for the page.
 320          * Once restored, the items will be removed from the archive tables.
 321          * The deletion log will be updated with an undeletion notice.
 322          *
 323          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 324          * @param string $comment
 325          * @param array $fileVersions
 326          * @param bool $unsuppress
 327          *
 328          * @return array(number of file revisions restored, number of image revisions restored, log message)
 329          * on success, false on failure
 330          */
 331         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 332                 // If both the set of text revisions and file revisions are empty,
 333                 // restore everything. Otherwise, just restore the requested items.
 334                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 335
 336                 $restoreText = $restoreAll || !empty( $timestamps );
 337                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 338
 339                 if( $restoreFiles && $this->title->getNamespace() == NS_IMAGE ) {
 340                         $img = wfLocalFile( $this->title );
 341                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 342                         $filesRestored = $this->fileStatus->successCount;
 343                 } else {
 344                         $filesRestored = 0;
 345                 }
 346
 347                 if( $restoreText ) {
 348                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress );
 349                         if($textRestored === false) // It must be one of UNDELETE_*
 350                                 return false;
 351                 } else {
 352                         $textRestored = 0;
 353                 }
 354
 355                 // Touch the log!
 356                 global $wgContLang;
 357                 $log = new LogPage( 'delete' );
 358
 359                 if( $textRestored && $filesRestored ) {
 360                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 361                                 $wgContLang->formatNum( $textRestored ),
 362                                 $wgContLang->formatNum( $filesRestored ) );
 363                 } elseif( $textRestored ) {
 364                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 365                                 $wgContLang->formatNum( $textRestored ) );
 366                 } elseif( $filesRestored ) {
 367                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 368                                 $wgContLang->formatNum( $filesRestored ) );
 369                 } else {
 370                         wfDebug( "Undelete: nothing undeleted...\n" );
 371                         return false;
 372                 }
 373
 374                 if( trim( $comment ) != '' )
 375                         $reason .= ": {$comment}";
 376                 $log->addEntry( 'restore', $this->title, $reason );
 377
 378                 return array($textRestored, $filesRestored, $reason);
 379         }
 380
 381         /**
 382          * This is the meaty bit -- restores archived revisions of the given page
 383          * to the cur/old tables. If the page currently exists, all revisions will
 384          * be stuffed into old, otherwise the most recent will go into cur.
 385          *
 386          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 387          * @param string $comment
 388          * @param array $fileVersions
 389          * @param bool $unsuppress, remove all ar_deleted/fa_deleted restrictions of seletected revs
 390          *
 391          * @return mixed number of revisions restored or false on failure
 392          */
 393         private function undeleteRevisions( $timestamps, $unsuppress = false ) {
 394                 if ( wfReadOnly() )
 395                         return false;
 396                 $restoreAll = empty( $timestamps );
 397
 398                 $dbw = wfGetDB( DB_MASTER );
 399
 400                 # Does this page already exist? We'll have to update it...
 401                 $article = new Article( $this->title );
 402                 $options = 'FOR UPDATE';
 403                 $page = $dbw->selectRow( 'page',
 404                         array( 'page_id', 'page_latest' ),
 405                         array( 'page_namespace' => $this->title->getNamespace(),
 406                                'page_title'     => $this->title->getDBkey() ),
 407                         __METHOD__,
 408                         $options );
 409                 if( $page ) {
 410                         $makepage = false;
 411                         # Page already exists. Import the history, and if necessary
 412                         # we'll update the latest revision field in the record.
 413                         $newid             = 0;
 414                         $pageId            = $page->page_id;
 415                         $previousRevId     = $page->page_latest;
 416                         # Get the time span of this page
 417                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 418                                 array( 'rev_id' => $previousRevId ),
 419                                 __METHOD__ );
 420                         if( $previousTimestamp === false ) {
 421                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 422                                 return 0;
 423                         }
 424                 } else {
 425                         # Have to create a new article...
 426                         $makepage = true;
 427                         $previousRevId = 0;
 428                         $previousTimestamp = 0;
 429                 }
 430
 431                 if( $restoreAll ) {
 432                         $oldones = '1 = 1'; # All revisions...
 433                 } else {
 434                         $oldts = implode( ',',
 435                                 array_map( array( &$dbw, 'addQuotes' ),
 436                                         array_map( array( &$dbw, 'timestamp' ),
 437                                                 $timestamps ) ) );
 438
 439                         $oldones = "ar_timestamp IN ( {$oldts} )";
 440                 }
 441
 442                 /**
 443                  * Select each archived revision...
 444                  */
 445                 $result = $dbw->select( 'archive',
 446                         /* fields */ array(
 447                                 'ar_rev_id',
 448                                 'ar_text',
 449                                 'ar_comment',
 450                                 'ar_user',
 451                                 'ar_user_text',
 452                                 'ar_timestamp',
 453                                 'ar_minor_edit',
 454                                 'ar_flags',
 455                                 'ar_text_id',
 456                                 'ar_deleted',
 457                                 'ar_page_id',
 458                                 'ar_len' ),
 459                         /* WHERE */ array(
 460                                 'ar_namespace' => $this->title->getNamespace(),
 461                                 'ar_title'     => $this->title->getDBkey(),
 462                                 $oldones ),
 463                         __METHOD__,
 464                         /* options */ array(
 465                                 'ORDER BY' => 'ar_timestamp' )
 466                         );
 467                 $ret = $dbw->resultObject( $result );
 468
 469                 $rev_count = $dbw->numRows( $result );
 470                 if( $rev_count ) {
 471                         # We need to seek around as just using DESC in the ORDER BY
 472                         # would leave the revisions inserted in the wrong order
 473                         $first = $ret->fetchObject();
 474                         $ret->seek( $rev_count - 1 );
 475                         $last = $ret->fetchObject();
 476                         // We don't handle well changing the top revision's settings
 477                         if( !$unsuppress && $last->ar_deleted && $last->ar_timestamp > $previousTimestamp ) {
 478                                 wfDebug( __METHOD__.": restoration would result in a deleted top revision\n" );
 479                                 return false;
 480                         }
 481                         $ret->seek( 0 );
 482                 }
 483
 484                 if( $makepage ) {
 485                         $newid  = $article->insertOn( $dbw );
 486                         $pageId = $newid;
 487                 }
 488
 489                 $revision = null;
 490                 $restored = 0;
 491
 492                 while( $row = $ret->fetchObject() ) {
 493                         if( $row->ar_text_id ) {
 494                                 // Revision was deleted in 1.5+; text is in
 495                                 // the regular text table, use the reference.
 496                                 // Specify null here so the so the text is
 497                                 // dereferenced for page length info if needed.
 498                                 $revText = null;
 499                         } else {
 500                                 // Revision was deleted in 1.4 or earlier.
 501                                 // Text is squashed into the archive row, and
 502                                 // a new text table entry will be created for it.
 503                                 $revText = Revision::getRevisionText( $row, 'ar_' );
 504                         }
 505                         $revision = new Revision( array(
 506                                 'page'       => $pageId,
 507                                 'id'         => $row->ar_rev_id,
 508                                 'text'       => $revText,
 509                                 'comment'    => $row->ar_comment,
 510                                 'user'       => $row->ar_user,
 511                                 'user_text'  => $row->ar_user_text,
 512                                 'timestamp'  => $row->ar_timestamp,
 513                                 'minor_edit' => $row->ar_minor_edit,
 514                                 'text_id'    => $row->ar_text_id,
 515                                 'deleted'        => $unsuppress ? 0 : $row->ar_deleted,
 516                                 'len'        => $row->ar_len
 517                                 ) );
 518                         $revision->insertOn( $dbw );
 519                         $restored++;
 520
 521                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 522                 }
 523                 // Was anything restored at all?
 524                 if($restored == 0)
 525                         return 0;
 526
 527                 if( $revision ) {
 528                         // Attach the latest revision to the page...
 529                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 530
 531                         if( $newid || $wasnew ) {
 532                                 // Update site stats, link tables, etc
 533                                 $article->createUpdates( $revision );
 534                         }
 535
 536                         if( $newid ) {
 537                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true ) );
 538                                 Article::onArticleCreate( $this->title );
 539                         } else {
 540                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false ) );
 541                                 Article::onArticleEdit( $this->title );
 542                         }
 543
 544                         if( $this->title->getNamespace() == NS_IMAGE ) {
 545                                 $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 546                                 $update->doUpdate();
 547                         }
 548                 } else {
 549                         // Revision couldn't be created. This is very weird
 550                         return self::UNDELETE_UNKNOWNERR;
 551                 }
 552
 553                 # Now that it's safely stored, take it out of the archive
 554                 $dbw->delete( 'archive',
 555                         /* WHERE */ array(
 556                                 'ar_namespace' => $this->title->getNamespace(),
 557                                 'ar_title' => $this->title->getDBkey(),
 558                                 $oldones ),
 559                         __METHOD__ );
 560
 561                 return $restored;
 562         }
 563
 564         function getFileStatus() { return $this->fileStatus; }
 565 }
 566
 567 /**
 568  * The HTML form for Special:Undelete, which allows users with the appropriate
 569  * permissions to view and restore deleted content.
 570  * @ingroup SpecialPage
 571  */
 572 class UndeleteForm {
 573         var $mAction, $mTarget, $mTimestamp, $mRestore, $mTargetObj;
 574         var $mTargetTimestamp, $mAllowed, $mComment;
 575
 576         function UndeleteForm( $request, $par = "" ) {
 577                 global $wgUser;
 578                 $this->mAction = $request->getVal( 'action' );
 579                 $this->mTarget = $request->getVal( 'target' );
 580                 $this->mSearchPrefix = $request->getText( 'prefix' );
 581                 $time = $request->getVal( 'timestamp' );
 582                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 583                 $this->mFile = $request->getVal( 'file' );
 584
 585                 $posted = $request->wasPosted() &&
 586                         $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 587                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 588                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 589                 $this->mDiff = $request->getCheck( 'diff' );
 590                 $this->mComment = $request->getText( 'wpComment' );
 591                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 592
 593                 if( $par != "" ) {
 594                         $this->mTarget = $par;
 595                 }
 596                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 597                         $this->mAllowed = true;
 598                 } else {
 599                         $this->mAllowed = false;
 600                         $this->mTimestamp = '';
 601                         $this->mRestore = false;
 602                 }
 603                 if ( $this->mTarget !== "" ) {
 604                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 605                 } else {
 606                         $this->mTargetObj = NULL;
 607                 }
 608                 if( $this->mRestore ) {
 609                         $timestamps = array();
 610                         $this->mFileVersions = array();
 611                         foreach( $_REQUEST as $key => $val ) {
 612                                 $matches = array();
 613                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 614                                         array_push( $timestamps, $matches[1] );
 615                                 }
 616
 617                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 618                                         $this->mFileVersions[] = intval( $matches[1] );
 619                                 }
 620                         }
 621                         rsort( $timestamps );
 622                         $this->mTargetTimestamp = $timestamps;
 623                 }
 624         }
 625
 626         function execute() {
 627                 global $wgOut, $wgUser;
 628                 if ( $this->mAllowed ) {
 629                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 630                 } else {
 631                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 632                 }
 633
 634                 if( is_null( $this->mTargetObj ) ) {
 635                 # Not all users can just browse every deleted page from the list
 636                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 637                                 $this->showSearchForm();
 638
 639                                 # List undeletable articles
 640                                 if( $this->mSearchPrefix ) {
 641                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 642                                         $this->showList( $result );
 643                                 }
 644                         } else {
 645                                 $wgOut->addWikiText( wfMsgHtml( 'undelete-header' ) );
 646                         }
 647                         return;
 648                 }
 649                 if( $this->mTimestamp !== '' ) {
 650                         return $this->showRevision( $this->mTimestamp );
 651                 }
 652                 if( $this->mFile !== null ) {
 653                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 654                         // Check if user is allowed to see this file
 655                         if( !$file->userCan( File::DELETED_FILE ) ) {
 656                                 $wgOut->permissionRequired( 'suppressrevision' );
 657                                 return false;
 658                         } else {
 659                                 return $this->showFile( $this->mFile );
 660                         }
 661                 }
 662                 if( $this->mRestore && $this->mAction == "submit" ) {
 663                         return $this->undelete();
 664                 }
 665                 return $this->showHistory();
 666         }
 667
 668         function showSearchForm() {
 669                 global $wgOut, $wgScript;
 670                 $wgOut->addWikiMsg( 'undelete-header' );
 671
 672                 $wgOut->addHtml(
 673                         Xml::openElement( 'form', array(
 674                                 'method' => 'get',
 675                                 'action' => $wgScript ) ) .
 676                         '<fieldset>' .
 677                         Xml::element( 'legend', array(),
 678                                 wfMsg( 'undelete-search-box' ) ) .
 679                         Xml::hidden( 'title',
 680                                 SpecialPage::getTitleFor( 'Undelete' )->getPrefixedDbKey() ) .
 681                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 682                                 'prefix', 'prefix', 20,
 683                                 $this->mSearchPrefix ) .
 684                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 685                         '</fieldset>' .
 686                         '</form>' );
 687         }
 688
 689         // Generic list of deleted pages
 690         private function showList( $result ) {
 691                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 692
 693                 if( $result->numRows() == 0 ) {
 694                         $wgOut->addWikiMsg( 'undelete-no-results' );
 695                         return;
 696                 }
 697
 698                 $wgOut->addWikiMsg( "undeletepagetext" );
 699
 700                 $sk = $wgUser->getSkin();
 701                 $undelete = SpecialPage::getTitleFor( 'Undelete' );
 702                 $wgOut->addHTML( "<ul>\n" );
 703                 while( $row = $result->fetchObject() ) {
 704                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 705                         $link = $sk->makeKnownLinkObj( $undelete, htmlspecialchars( $title->getPrefixedText() ),
 706                                 'target=' . $title->getPrefixedUrl() );
 707                         #$revs = wfMsgHtml( 'undeleterevisions', $wgLang->formatNum( $row->count ) );
 708                         $revs = wfMsgExt( 'undeleterevisions',
 709                                 array( 'parseinline' ),
 710                                 $wgLang->formatNum( $row->count ) );
 711                         $wgOut->addHtml( "<li>{$link} ({$revs})</li>\n" );
 712                 }
 713                 $result->free();
 714                 $wgOut->addHTML( "</ul>\n" );
 715
 716                 return true;
 717         }
 718
 719         private function showRevision( $timestamp ) {
 720                 global $wgLang, $wgUser, $wgOut;
 721                 $self = SpecialPage::getTitleFor( 'Undelete' );
 722                 $skin = $wgUser->getSkin();
 723
 724                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 725
 726                 $archive = new PageArchive( $this->mTargetObj );
 727                 $rev = $archive->getRevision( $timestamp );
 728
 729                 if( !$rev ) {
 730                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 731                         return;
 732                 }
 733
 734                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 735                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 736                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 737                                 return;
 738                         } else {
 739                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 740                                 $wgOut->addHTML( '<br/>' );
 741                                 // and we are allowed to see...
 742                         }
 743                 }
 744
 745                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 746
 747                 $link = $skin->makeKnownLinkObj(
 748                         SpecialPage::getTitleFor( 'Undelete', $this->mTargetObj->getPrefixedDBkey() ),
 749                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 750                 );
 751
 752                 if( $this->mDiff ) {
 753                         $previousRev = $archive->getPreviousRevision( $timestamp );
 754                         if( $previousRev ) {
 755                                 $this->showDiff( $previousRev, $rev );
 756                                 if( $wgUser->getOption( 'diffonly' ) ) {
 757                                         return;
 758                                 } else {
 759                                         $wgOut->addHtml( '<hr />' );
 760                                 }
 761                         } else {
 762                                 $wgOut->addHtml( wfMsgHtml( 'undelete-nodiff' ) );
 763                         }
 764                 }
 765
 766                 // date and time are separate parameters to facilitate localisation.
 767                 // $time is kept for backward compat reasons.
 768                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 769                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 770                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 771                 $user = $skin->revUserTools( $rev );
 772
 773                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'undelete-revision', $link, $time, $user, $t, $d ) . '</p>' );
 774
 775                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 776
 777                 if( $this->mPreview ) {
 778                         $wgOut->addHtml( "<hr />\n" );
 779
 780                         //Hide [edit]s
 781                         $popts = $wgOut->parserOptions();
 782                         $popts->setEditSection( false );
 783                         $wgOut->parserOptions( $popts );
 784                         $wgOut->addWikiTextTitleTidy( $rev->revText(), $this->mTargetObj, true );
 785                 }
 786
 787                 $wgOut->addHtml(
 788                         wfElement( 'textarea', array(
 789                                         'readonly' => 'readonly',
 790                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 791                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 792                                 $rev->revText() . "\n" ) .
 793                         wfOpenElement( 'div' ) .
 794                         wfOpenElement( 'form', array(
 795                                 'method' => 'post',
 796                                 'action' => $self->getLocalURL( "action=submit" ) ) ) .
 797                         wfElement( 'input', array(
 798                                 'type' => 'hidden',
 799                                 'name' => 'target',
 800                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 801                         wfElement( 'input', array(
 802                                 'type' => 'hidden',
 803                                 'name' => 'timestamp',
 804                                 'value' => $timestamp ) ) .
 805                         wfElement( 'input', array(
 806                                 'type' => 'hidden',
 807                                 'name' => 'wpEditToken',
 808                                 'value' => $wgUser->editToken() ) ) .
 809                         wfElement( 'input', array(
 810                                 'type' => 'submit',
 811                                 'name' => 'preview',
 812                                 'value' => wfMsg( 'showpreview' ) ) ) .
 813                         wfElement( 'input', array(
 814                                 'name' => 'diff',
 815                                 'type' => 'submit',
 816                                 'value' => wfMsg( 'showdiff' ) ) ) .
 817                         wfCloseElement( 'form' ) .
 818                         wfCloseElement( 'div' ) );
 819         }
 820
 821         /**
 822          * Build a diff display between this and the previous either deleted
 823          * or non-deleted edit.
 824          * @param Revision $previousRev
 825          * @param Revision $currentRev
 826          * @return string HTML
 827          */
 828         function showDiff( $previousRev, $currentRev ) {
 829                 global $wgOut, $wgUser;
 830
 831                 $diffEngine = new DifferenceEngine();
 832                 $diffEngine->showDiffStyle();
 833                 $wgOut->addHtml(
 834                         "<div>" .
 835                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 836                         "<col class='diff-marker' />" .
 837                         "<col class='diff-content' />" .
 838                         "<col class='diff-marker' />" .
 839                         "<col class='diff-content' />" .
 840                         "<tr>" .
 841                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 842                                 $this->diffHeader( $previousRev ) .
 843                                 "</td>" .
 844                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 845                                 $this->diffHeader( $currentRev ) .
 846                                 "</td>" .
 847                         "</tr>" .
 848                         $diffEngine->generateDiffBody(
 849                                 $previousRev->getText(), $currentRev->getText() ) .
 850                         "</table>" .
 851                         "</div>\n" );
 852
 853         }
 854
 855         private function diffHeader( $rev ) {
 856                 global $wgUser, $wgLang, $wgLang;
 857                 $sk = $wgUser->getSkin();
 858                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 859                 if( $isDeleted ) {
 860                         /// @fixme $rev->getTitle() is null for deleted revs...?
 861                         $targetPage = SpecialPage::getTitleFor( 'Undelete' );
 862                         $targetQuery = 'target=' .
 863                                 $this->mTargetObj->getPrefixedUrl() .
 864                                 '&timestamp=' .
 865                                 wfTimestamp( TS_MW, $rev->getTimestamp() );
 866                 } else {
 867                         /// @fixme getId() may return non-zero for deleted revs...
 868                         $targetPage = $rev->getTitle();
 869                         $targetQuery = 'oldid=' . $rev->getId();
 870                 }
 871                 return
 872                         '<div id="mw-diff-otitle1"><strong>' .
 873                                 $sk->makeLinkObj( $targetPage,
 874                                         wfMsgHtml( 'revisionasof',
 875                                                 $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 876                                         $targetQuery ) .
 877                                 ( $isDeleted ? ' ' . wfMsgHtml( 'deletedrev' ) : '' ) .
 878                         '</strong></div>' .
 879                         '<div id="mw-diff-otitle2">' .
 880                                 $sk->revUserTools( $rev ) . '<br/>' .
 881                         '</div>' .
 882                         '<div id="mw-diff-otitle3">' .
 883                                 $sk->revComment( $rev ) . '<br/>' .
 884                         '</div>';
 885         }
 886
 887         /**
 888          * Show a deleted file version requested by the visitor.
 889          */
 890         private function showFile( $key ) {
 891                 global $wgOut, $wgRequest;
 892                 $wgOut->disable();
 893
 894                 # We mustn't allow the output to be Squid cached, otherwise
 895                 # if an admin previews a deleted image, and it's cached, then
 896                 # a user without appropriate permissions can toddle off and
 897                 # nab the image, and Squid will serve it
 898                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 899                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 900                 $wgRequest->response()->header( 'Pragma: no-cache' );
 901
 902                 $store = FileStore::get( 'deleted' );
 903                 $store->stream( $key );
 904         }
 905
 906         private function showHistory() {
 907                 global $wgLang, $wgUser, $wgOut;
 908
 909                 $sk = $wgUser->getSkin();
 910                 if( $this->mAllowed ) {
 911                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 912                 } else {
 913                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
 914                 }
 915
 916                 $wgOut->addWikiText( wfMsgHtml( 'undeletepagetitle', $this->mTargetObj->getPrefixedText()) );
 917
 918                 $archive = new PageArchive( $this->mTargetObj );
 919                 /*
 920                 $text = $archive->getLastRevisionText();
 921                 if( is_null( $text ) ) {
 922                         $wgOut->addWikiMsg( "nohistory" );
 923                         return;
 924                 }
 925                 */
 926                 if ( $this->mAllowed ) {
 927                         $wgOut->addWikiMsg( "undeletehistory" );
 928                         $wgOut->addWikiMsg( "undeleterevdel" );
 929                 } else {
 930                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
 931                 }
 932
 933                 # List all stored revisions
 934                 $revisions = $archive->listRevisions();
 935                 $files = $archive->listFiles();
 936
 937                 $haveRevisions = $revisions && $revisions->numRows() > 0;
 938                 $haveFiles = $files && $files->numRows() > 0;
 939
 940                 # Batch existence check on user and talk pages
 941                 if( $haveRevisions ) {
 942                         $batch = new LinkBatch();
 943                         while( $row = $revisions->fetchObject() ) {
 944                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
 945                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
 946                         }
 947                         $batch->execute();
 948                         $revisions->seek( 0 );
 949                 }
 950                 if( $haveFiles ) {
 951                         $batch = new LinkBatch();
 952                         while( $row = $files->fetchObject() ) {
 953                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
 954                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
 955                         }
 956                         $batch->execute();
 957                         $files->seek( 0 );
 958                 }
 959
 960                 if ( $this->mAllowed ) {
 961                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
 962                         $action = $titleObj->getLocalURL( "action=submit" );
 963                         # Start the form here
 964                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
 965                         $wgOut->addHtml( $top );
 966                 }
 967
 968                 # Show relevant lines from the deletion log:
 969                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
 970                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
 971
 972                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
 973                         # Format the user-visible controls (comment field, submission button)
 974                         # in a nice little table
 975                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
 976                                 $unsuppressBox =
 977                                         "<tr>
 978                                                 <td>&nbsp;</td>
 979                                                 <td class='mw-input'>" .
 980                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
 981                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
 982                                                 "</td>
 983                                         </tr>";
 984                         } else {
 985                                 $unsuppressBox = "";
 986                         }
 987                         $table =
 988                                 Xml::openElement( 'fieldset' ) .
 989                                 Xml::element( 'legend', null, wfMsg( 'undelete-fieldset-title' ) ).
 990                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
 991                                         "<tr>
 992                                                 <td colspan='2'>" .
 993                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
 994                                                 "</td>
 995                                         </tr>
 996                                         <tr>
 997                                                 <td class='mw-label'>" .
 998                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
 999                                                 "</td>
1000                                                 <td class='mw-input'>" .
1001                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1002                                                 "</td>
1003                                         </tr>
1004                                         <tr>
1005                                                 <td>&nbsp;</td>
1006                                                 <td class='mw-submit'>" .
1007                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) .
1008                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) .
1009                                                 "</td>
1010                                         </tr>" .
1011                                         $unsuppressBox .
1012                                 Xml::closeElement( 'table' ) .
1013                                 Xml::closeElement( 'fieldset' );
1014
1015                         $wgOut->addHtml( $table );
1016                 }
1017
1018                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1019
1020                 if( $haveRevisions ) {
1021                         # The page's stored (deleted) history:
1022                         $wgOut->addHTML("<ul>");
1023                         $target = urlencode( $this->mTarget );
1024                         $remaining = $revisions->numRows();
1025                         $earliestLiveTime = $this->getEarliestTime( $this->mTargetObj );
1026
1027                         while( $row = $revisions->fetchObject() ) {
1028                                 $remaining--;
1029                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1030                         }
1031                         $revisions->free();
1032                         $wgOut->addHTML("</ul>");
1033                 } else {
1034                         $wgOut->addWikiMsg( "nohistory" );
1035                 }
1036
1037                 if( $haveFiles ) {
1038                         $wgOut->addHtml( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1039                         $wgOut->addHtml( "<ul>" );
1040                         while( $row = $files->fetchObject() ) {
1041                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1042                         }
1043                         $files->free();
1044                         $wgOut->addHTML( "</ul>" );
1045                 }
1046
1047                 if ( $this->mAllowed ) {
1048                         # Slip in the hidden controls here
1049                         $misc  = Xml::hidden( 'target', $this->mTarget );
1050                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
1051                         $misc .= Xml::closeElement( 'form' );
1052                         $wgOut->addHtml( $misc );
1053                 }
1054
1055                 return true;
1056         }
1057
1058         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1059                 global $wgUser, $wgLang;
1060
1061                 $rev = new Revision( array(
1062                                 'page'       => $this->mTargetObj->getArticleId(),
1063                                 'comment'    => $row->ar_comment,
1064                                 'user'       => $row->ar_user,
1065                                 'user_text'  => $row->ar_user_text,
1066                                 'timestamp'  => $row->ar_timestamp,
1067                                 'minor_edit' => $row->ar_minor_edit,
1068                                 'deleted'    => $row->ar_deleted,
1069                                 'len'        => $row->ar_len ) );
1070
1071                 $stxt = '';
1072                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1073                 if( $this->mAllowed ) {
1074                         $checkBox = Xml::check( "ts$ts" );
1075                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1076                         $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1077                         # Last link
1078                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1079                                 $last = wfMsgHtml('diff');
1080                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1081                                 $last = $sk->makeKnownLinkObj( $titleObj, wfMsgHtml('diff'),
1082                                         "target=" . $this->mTargetObj->getPrefixedUrl() . "&timestamp=$ts&diff=prev" );
1083                         } else {
1084                                 $last = wfMsgHtml('diff');
1085                         }
1086                 } else {
1087                         $checkBox = '';
1088                         $pageLink = $wgLang->timeanddate( $ts, true );
1089                         $last = wfMsgHtml('diff');
1090                 }
1091                 $userLink = $sk->revUserTools( $rev );
1092
1093                 if(!is_null($size = $row->ar_len)) {
1094                         $stxt = $sk->formatRevisionSize( $size );
1095                 }
1096                 $comment = $sk->revComment( $rev );
1097                 $revdlink = '';
1098                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1099                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1100                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1101                         // If revision was hidden from sysops
1102                                 $del = wfMsgHtml('rev-delundel');
1103                         } else {
1104                                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1105                                 $del = $sk->makeKnownLinkObj( $revdel,
1106                                         wfMsgHtml('rev-delundel'),
1107                                         'target=' . $this->mTargetObj->getPrefixedUrl() . "&artimestamp=$ts" );
1108                                 // Bolden oversighted content
1109                                 if( $rev->isDeleted( Revision::DELETED_RESTRICTED ) )
1110                                         $del = "<strong>$del</strong>";
1111                         }
1112                         $revdlink = "<tt>(<small>$del</small>)</tt>";
1113                 }
1114
1115                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1116         }
1117
1118         private function formatFileRow( $row, $sk ) {
1119                 global $wgUser, $wgLang;
1120
1121                 $file = ArchivedFile::newFromRow( $row );
1122
1123                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1124                 if( $this->mAllowed && $row->fa_storage_key ) {
1125                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1126                         $key = urlencode( $row->fa_storage_key );
1127                         $target = urlencode( $this->mTarget );
1128                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1129                         $pageLink = $this->getFileLink( $file, $titleObj, $ts, $key, $sk );
1130                 } else {
1131                         $checkBox = '';
1132                         $pageLink = $wgLang->timeanddate( $ts, true );
1133                 }
1134                 $userLink = $this->getFileUser( $file, $sk );
1135                 $data =
1136                         wfMsg( 'widthheight',
1137                                 $wgLang->formatNum( $row->fa_width ),
1138                                 $wgLang->formatNum( $row->fa_height ) ) .
1139                         ' (' .
1140                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1141                         ')';
1142                 $data = htmlspecialchars( $data );
1143                 $comment = $this->getFileComment( $file, $sk );
1144                 $revdlink = '';
1145                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1146                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1147                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1148                         // If revision was hidden from sysops
1149                                 $del = wfMsgHtml('rev-delundel');
1150                         } else {
1151                                 $del = $sk->makeKnownLinkObj( $revdel,
1152                                         wfMsgHtml('rev-delundel'),
1153                                         'target=' . $this->mTargetObj->getPrefixedUrl() .
1154                                         '&fileid=' . $row->fa_id );
1155                                 // Bolden oversighted content
1156                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) )
1157                                         $del = "<strong>$del</strong>";
1158                         }
1159                         $revdlink = "<tt>(<small>$del</small>)</tt>";
1160                 }
1161                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1162         }
1163
1164         private function getEarliestTime( $title ) {
1165                 $dbr = wfGetDB( DB_SLAVE );
1166                 if( $title->exists() ) {
1167                         $min = $dbr->selectField( 'revision',
1168                                 'MIN(rev_timestamp)',
1169                                 array( 'rev_page' => $title->getArticleId() ),
1170                                 __METHOD__ );
1171                         return wfTimestampOrNull( TS_MW, $min );
1172                 }
1173                 return null;
1174         }
1175
1176         /**
1177          * Fetch revision text link if it's available to all users
1178          * @return string
1179          */
1180         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1181                 global $wgLang;
1182
1183                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1184                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1185                 } else {
1186                         $link = $sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ),
1187                                 "target=".$this->mTargetObj->getPrefixedUrl()."&timestamp=$ts" );
1188                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1189                                 $link = '<span class="history-deleted">' . $link . '</span>';
1190                         return $link;
1191                 }
1192         }
1193
1194         /**
1195          * Fetch image view link if it's available to all users
1196          * @return string
1197          */
1198         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1199                 global $wgLang;
1200
1201                 if( !$file->userCan(File::DELETED_FILE) ) {
1202                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1203                 } else {
1204                         $link = $sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ),
1205                                 "target=".$this->mTargetObj->getPrefixedUrl()."&file=$key" );
1206                         if( $file->isDeleted(File::DELETED_FILE) )
1207                                 $link = '<span class="history-deleted">' . $link . '</span>';
1208                         return $link;
1209                 }
1210         }
1211
1212         /**
1213          * Fetch file's user id if it's available to this user
1214          * @return string
1215          */
1216         function getFileUser( $file, $sk ) {
1217                 if( !$file->userCan(File::DELETED_USER) ) {
1218                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1219                 } else {
1220                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1221                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1222                         if( $file->isDeleted(File::DELETED_USER) )
1223                                 $link = '<span class="history-deleted">' . $link . '</span>';
1224                         return $link;
1225                 }
1226         }
1227
1228         /**
1229          * Fetch file upload comment if it's available to this user
1230          * @return string
1231          */
1232         function getFileComment( $file, $sk ) {
1233                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1234                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1235                 } else {
1236                         $link = $sk->commentBlock( $file->getRawDescription() );
1237                         if( $file->isDeleted(File::DELETED_COMMENT) )
1238                                 $link = '<span class="history-deleted">' . $link . '</span>';
1239                         return $link;
1240                 }
1241         }
1242
1243         function undelete() {
1244                 global $wgOut, $wgUser;
1245                 if ( wfReadOnly() ) {
1246                         $wgOut->readOnlyPage();
1247                         return;
1248                 }
1249                 if( !is_null( $this->mTargetObj ) ) {
1250                         $archive = new PageArchive( $this->mTargetObj );
1251                         $ok = $archive->undelete(
1252                                 $this->mTargetTimestamp,
1253                                 $this->mComment,
1254                                 $this->mFileVersions,
1255                                 $this->mUnsuppress );
1256
1257                         if( is_array($ok) ) {
1258                                 if ( $ok[1] ) // Undeleted file count
1259                                         wfRunHooks( 'FileUndeleteComplete', array(
1260                                                 $this->mTargetObj, $this->mFileVersions,
1261                                                 $wgUser, $this->mComment) );
1262
1263                                 $skin = $wgUser->getSkin();
1264                                 $link = $skin->makeKnownLinkObj( $this->mTargetObj );
1265                                 $wgOut->addHtml( wfMsgWikiHtml( 'undeletedpage', $link ) );
1266                         } else {
1267                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1268                                 $wgOut->addHtml( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1269                         }
1270
1271                         // Show file deletion warnings and errors
1272                         $status = $archive->getFileStatus();
1273                         if( $status && !$status->isGood() ) {
1274                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1275                         }
1276                 } else {
1277                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1278                 }
1279                 return false;
1280         }
1281 }