includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30
  31         /**
  32          * @var Title
  33          */
  34         protected $title;
  35         var $fileStatus;
  36
  37         function __construct( $title ) {
  38                 if( is_null( $title ) ) {
  39                         throw new MWException( __METHOD__ . ' given a null title.' );
  40                 }
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * List all deleted pages recorded in the archive table. Returns result
  46          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  47          * namespace/title.
  48          *
  49          * @return ResultWrapper
  50          */
  51         public static function listAllPages() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53                 return self::listPages( $dbr, '' );
  54         }
  55
  56         /**
  57          * List deleted pages recorded in the archive table matching the
  58          * given title prefix.
  59          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  60          *
  61          * @param $prefix String: title prefix
  62          * @return ResultWrapper
  63          */
  64         public static function listPagesByPrefix( $prefix ) {
  65                 $dbr = wfGetDB( DB_SLAVE );
  66
  67                 $title = Title::newFromText( $prefix );
  68                 if( $title ) {
  69                         $ns = $title->getNamespace();
  70                         $prefix = $title->getDBkey();
  71                 } else {
  72                         // Prolly won't work too good
  73                         // @todo handle bare namespace names cleanly?
  74                         $ns = 0;
  75                 }
  76                 $conds = array(
  77                         'ar_namespace' => $ns,
  78                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  79                 );
  80                 return self::listPages( $dbr, $conds );
  81         }
  82
  83         protected static function listPages( $dbr, $condition ) {
  84                 return $dbr->resultObject(
  85                         $dbr->select(
  86                                 array( 'archive' ),
  87                                 array(
  88                                         'ar_namespace',
  89                                         'ar_title',
  90                                         'COUNT(*) AS count'
  91                                 ),
  92                                 $condition,
  93                                 __METHOD__,
  94                                 array(
  95                                         'GROUP BY' => 'ar_namespace,ar_title',
  96                                         'ORDER BY' => 'ar_namespace,ar_title',
  97                                         'LIMIT' => 100,
  98                                 )
  99                         )
 100                 );
 101         }
 102
 103         /**
 104          * List the revisions of the given page. Returns result wrapper with
 105          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 106          *
 107          * @return ResultWrapper
 108          */
 109         function listRevisions() {
 110                 $dbr = wfGetDB( DB_SLAVE );
 111                 $res = $dbr->select( 'archive',
 112                         array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id' ),
 113                         array( 'ar_namespace' => $this->title->getNamespace(),
 114                                    'ar_title' => $this->title->getDBkey() ),
 115                         'PageArchive::listRevisions',
 116                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 117                 $ret = $dbr->resultObject( $res );
 118                 return $ret;
 119         }
 120
 121         /**
 122          * List the deleted file revisions for this page, if it's a file page.
 123          * Returns a result wrapper with various filearchive fields, or null
 124          * if not a file page.
 125          *
 126          * @return ResultWrapper
 127          * @todo Does this belong in Image for fuller encapsulation?
 128          */
 129         function listFiles() {
 130                 if( $this->title->getNamespace() == NS_FILE ) {
 131                         $dbr = wfGetDB( DB_SLAVE );
 132                         $res = $dbr->select( 'filearchive',
 133                                 array(
 134                                         'fa_id',
 135                                         'fa_name',
 136                                         'fa_archive_name',
 137                                         'fa_storage_key',
 138                                         'fa_storage_group',
 139                                         'fa_size',
 140                                         'fa_width',
 141                                         'fa_height',
 142                                         'fa_bits',
 143                                         'fa_metadata',
 144                                         'fa_media_type',
 145                                         'fa_major_mime',
 146                                         'fa_minor_mime',
 147                                         'fa_description',
 148                                         'fa_user',
 149                                         'fa_user_text',
 150                                         'fa_timestamp',
 151                                         'fa_deleted' ),
 152                                 array( 'fa_name' => $this->title->getDBkey() ),
 153                                 __METHOD__,
 154                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 155                         $ret = $dbr->resultObject( $res );
 156                         return $ret;
 157                 }
 158                 return null;
 159         }
 160
 161         /**
 162          * Return a Revision object containing data for the deleted revision.
 163          * Note that the result *may* or *may not* have a null page ID.
 164          *
 165          * @param $timestamp String
 166          * @return Revision
 167          */
 168         function getRevision( $timestamp ) {
 169                 $dbr = wfGetDB( DB_SLAVE );
 170                 $row = $dbr->selectRow( 'archive',
 171                         array(
 172                                 'ar_rev_id',
 173                                 'ar_text',
 174                                 'ar_comment',
 175                                 'ar_user',
 176                                 'ar_user_text',
 177                                 'ar_timestamp',
 178                                 'ar_minor_edit',
 179                                 'ar_flags',
 180                                 'ar_text_id',
 181                                 'ar_deleted',
 182                                 'ar_len' ),
 183                         array( 'ar_namespace' => $this->title->getNamespace(),
 184                                    'ar_title' => $this->title->getDBkey(),
 185                                    'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 186                         __METHOD__ );
 187                 if( $row ) {
 188                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 189                 } else {
 190                         return null;
 191                 }
 192         }
 193
 194         /**
 195          * Return the most-previous revision, either live or deleted, against
 196          * the deleted revision given by timestamp.
 197          *
 198          * May produce unexpected results in case of history merges or other
 199          * unusual time issues.
 200          *
 201          * @param $timestamp String
 202          * @return Revision or null
 203          */
 204         function getPreviousRevision( $timestamp ) {
 205                 $dbr = wfGetDB( DB_SLAVE );
 206
 207                 // Check the previous deleted revision...
 208                 $row = $dbr->selectRow( 'archive',
 209                         'ar_timestamp',
 210                         array( 'ar_namespace' => $this->title->getNamespace(),
 211                                    'ar_title' => $this->title->getDBkey(),
 212                                    'ar_timestamp < ' .
 213                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 214                         __METHOD__,
 215                         array(
 216                                 'ORDER BY' => 'ar_timestamp DESC',
 217                                 'LIMIT' => 1 ) );
 218                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 219
 220                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 221                         array( 'rev_id', 'rev_timestamp' ),
 222                         array(
 223                                 'page_namespace' => $this->title->getNamespace(),
 224                                 'page_title' => $this->title->getDBkey(),
 225                                 'page_id = rev_page',
 226                                 'rev_timestamp < ' .
 227                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 228                         __METHOD__,
 229                         array(
 230                                 'ORDER BY' => 'rev_timestamp DESC',
 231                                 'LIMIT' => 1 ) );
 232                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 233                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 234
 235                 if( $prevLive && $prevLive > $prevDeleted ) {
 236                         // Most prior revision was live
 237                         return Revision::newFromId( $prevLiveId );
 238                 } elseif( $prevDeleted ) {
 239                         // Most prior revision was deleted
 240                         return $this->getRevision( $prevDeleted );
 241                 } else {
 242                         // No prior revision on this page.
 243                         return null;
 244                 }
 245         }
 246
 247         /**
 248          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 249          *
 250          * @param $row Object: database row
 251          * @return Revision
 252          */
 253         function getTextFromRow( $row ) {
 254                 if( is_null( $row->ar_text_id ) ) {
 255                         // An old row from MediaWiki 1.4 or previous.
 256                         // Text is embedded in this row in classic compression format.
 257                         return Revision::getRevisionText( $row, "ar_" );
 258                 } else {
 259                         // New-style: keyed to the text storage backend.
 260                         $dbr = wfGetDB( DB_SLAVE );
 261                         $text = $dbr->selectRow( 'text',
 262                                 array( 'old_text', 'old_flags' ),
 263                                 array( 'old_id' => $row->ar_text_id ),
 264                                 __METHOD__ );
 265                         return Revision::getRevisionText( $text );
 266                 }
 267         }
 268
 269
 270         /**
 271          * Fetch (and decompress if necessary) the stored text of the most
 272          * recently edited deleted revision of the page.
 273          *
 274          * If there are no archived revisions for the page, returns NULL.
 275          *
 276          * @return String
 277          */
 278         function getLastRevisionText() {
 279                 $dbr = wfGetDB( DB_SLAVE );
 280                 $row = $dbr->selectRow( 'archive',
 281                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 282                         array( 'ar_namespace' => $this->title->getNamespace(),
 283                                    'ar_title' => $this->title->getDBkey() ),
 284                         __METHOD__,
 285                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 286                 if( $row ) {
 287                         return $this->getTextFromRow( $row );
 288                 } else {
 289                         return null;
 290                 }
 291         }
 292
 293         /**
 294          * Quick check if any archived revisions are present for the page.
 295          *
 296          * @return Boolean
 297          */
 298         function isDeleted() {
 299                 $dbr = wfGetDB( DB_SLAVE );
 300                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 301                         array( 'ar_namespace' => $this->title->getNamespace(),
 302                                    'ar_title' => $this->title->getDBkey() ) );
 303                 return ($n > 0);
 304         }
 305
 306         /**
 307          * Restore the given (or all) text and file revisions for the page.
 308          * Once restored, the items will be removed from the archive tables.
 309          * The deletion log will be updated with an undeletion notice.
 310          *
 311          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 312          * @param $comment String
 313          * @param $fileVersions Array
 314          * @param $unsuppress Boolean
 315          *
 316          * @return array(number of file revisions restored, number of image revisions restored, log message)
 317          * on success, false on failure
 318          */
 319         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 320                 // If both the set of text revisions and file revisions are empty,
 321                 // restore everything. Otherwise, just restore the requested items.
 322                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 323
 324                 $restoreText = $restoreAll || !empty( $timestamps );
 325                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 326
 327                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 328                         $img = wfLocalFile( $this->title );
 329                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 330                         if ( !$this->fileStatus->isOk() ) {
 331                                 return false;
 332                         }
 333                         $filesRestored = $this->fileStatus->successCount;
 334                 } else {
 335                         $filesRestored = 0;
 336                 }
 337
 338                 if( $restoreText ) {
 339                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 340                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 341                                 return false;
 342                         }
 343                 } else {
 344                         $textRestored = 0;
 345                 }
 346
 347                 // Touch the log!
 348                 global $wgContLang;
 349                 $log = new LogPage( 'delete' );
 350
 351                 if( $textRestored && $filesRestored ) {
 352                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 353                                 $wgContLang->formatNum( $textRestored ),
 354                                 $wgContLang->formatNum( $filesRestored ) );
 355                 } elseif( $textRestored ) {
 356                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 357                                 $wgContLang->formatNum( $textRestored ) );
 358                 } elseif( $filesRestored ) {
 359                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 360                                 $wgContLang->formatNum( $filesRestored ) );
 361                 } else {
 362                         wfDebug( "Undelete: nothing undeleted...\n" );
 363                         return false;
 364                 }
 365
 366                 if( trim( $comment ) != '' )
 367                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 368                 $log->addEntry( 'restore', $this->title, $reason );
 369
 370                 return array($textRestored, $filesRestored, $reason);
 371         }
 372
 373         /**
 374          * This is the meaty bit -- restores archived revisions of the given page
 375          * to the cur/old tables. If the page currently exists, all revisions will
 376          * be stuffed into old, otherwise the most recent will go into cur.
 377          *
 378          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 379          * @param $comment String
 380          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 381          *
 382          * @return Mixed: number of revisions restored or false on failure
 383          */
 384         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 385                 if ( wfReadOnly() )
 386                         return false;
 387                 $restoreAll = empty( $timestamps );
 388
 389                 $dbw = wfGetDB( DB_MASTER );
 390
 391                 # Does this page already exist? We'll have to update it...
 392                 $article = new Article( $this->title );
 393                 $options = 'FOR UPDATE'; // lock page
 394                 $page = $dbw->selectRow( 'page',
 395                         array( 'page_id', 'page_latest' ),
 396                         array( 'page_namespace' => $this->title->getNamespace(),
 397                                    'page_title'     => $this->title->getDBkey() ),
 398                         __METHOD__,
 399                         $options
 400                 );
 401                 if( $page ) {
 402                         $makepage = false;
 403                         # Page already exists. Import the history, and if necessary
 404                         # we'll update the latest revision field in the record.
 405                         $newid             = 0;
 406                         $pageId            = $page->page_id;
 407                         $previousRevId    = $page->page_latest;
 408                         # Get the time span of this page
 409                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 410                                 array( 'rev_id' => $previousRevId ),
 411                                 __METHOD__ );
 412                         if( $previousTimestamp === false ) {
 413                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 414                                 return 0;
 415                         }
 416                 } else {
 417                         # Have to create a new article...
 418                         $makepage = true;
 419                         $previousRevId = 0;
 420                         $previousTimestamp = 0;
 421                 }
 422
 423                 if( $restoreAll ) {
 424                         $oldones = '1 = 1'; # All revisions...
 425                 } else {
 426                         $oldts = implode( ',',
 427                                 array_map( array( &$dbw, 'addQuotes' ),
 428                                         array_map( array( &$dbw, 'timestamp' ),
 429                                                 $timestamps ) ) );
 430
 431                         $oldones = "ar_timestamp IN ( {$oldts} )";
 432                 }
 433
 434                 /**
 435                  * Select each archived revision...
 436                  */
 437                 $result = $dbw->select( 'archive',
 438                         /* fields */ array(
 439                                 'ar_rev_id',
 440                                 'ar_text',
 441                                 'ar_comment',
 442                                 'ar_user',
 443                                 'ar_user_text',
 444                                 'ar_timestamp',
 445                                 'ar_minor_edit',
 446                                 'ar_flags',
 447                                 'ar_text_id',
 448                                 'ar_deleted',
 449                                 'ar_page_id',
 450                                 'ar_len' ),
 451                         /* WHERE */ array(
 452                                 'ar_namespace' => $this->title->getNamespace(),
 453                                 'ar_title'     => $this->title->getDBkey(),
 454                                 $oldones ),
 455                         __METHOD__,
 456                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 457                 );
 458                 $ret = $dbw->resultObject( $result );
 459                 $rev_count = $dbw->numRows( $result );
 460                 if( !$rev_count ) {
 461                         wfDebug( __METHOD__.": no revisions to restore\n" );
 462                         return false; // ???
 463                 }
 464
 465                 $ret->seek( $rev_count - 1 ); // move to last
 466                 $row = $ret->fetchObject(); // get newest archived rev
 467                 $ret->seek( 0 ); // move back
 468
 469                 if( $makepage ) {
 470                         // Check the state of the newest to-be version...
 471                         if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 472                                 return false; // we can't leave the current revision like this!
 473                         }
 474                         // Safe to insert now...
 475                         $newid  = $article->insertOn( $dbw );
 476                         $pageId = $newid;
 477                 } else {
 478                         // Check if a deleted revision will become the current revision...
 479                         if( $row->ar_timestamp > $previousTimestamp ) {
 480                                 // Check the state of the newest to-be version...
 481                                 if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 482                                         return false; // we can't leave the current revision like this!
 483                                 }
 484                         }
 485                 }
 486
 487                 $revision = null;
 488                 $restored = 0;
 489
 490                 foreach ( $ret as $row ) {
 491                         // Check for key dupes due to shitty archive integrity.
 492                         if( $row->ar_rev_id ) {
 493                                 $exists = $dbw->selectField( 'revision', '1', array('rev_id' => $row->ar_rev_id), __METHOD__ );
 494                                 if( $exists ) continue; // don't throw DB errors
 495                         }
 496                         // Insert one revision at a time...maintaining deletion status
 497                         // unless we are specifically removing all restrictions...
 498                         $revision = Revision::newFromArchiveRow( $row,
 499                                 array(
 500                                         'page' => $pageId,
 501                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 502                                 ) );
 503
 504                         $revision->insertOn( $dbw );
 505                         $restored++;
 506
 507                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 508                 }
 509                 # Now that it's safely stored, take it out of the archive
 510                 $dbw->delete( 'archive',
 511                         /* WHERE */ array(
 512                                 'ar_namespace' => $this->title->getNamespace(),
 513                                 'ar_title' => $this->title->getDBkey(),
 514                                 $oldones ),
 515                         __METHOD__ );
 516
 517                 // Was anything restored at all?
 518                 if ( $restored == 0 ) {
 519                         return 0;
 520                 }
 521
 522                 // Attach the latest revision to the page...
 523                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 524                 if ( $newid || $wasnew ) {
 525                         // Update site stats, link tables, etc
 526                         $article->createUpdates( $revision );
 527                 }
 528
 529                 if( $newid ) {
 530                         wfRunHooks( 'ArticleUndelete', array( &$this->title, true, $comment ) );
 531                         Article::onArticleCreate( $this->title );
 532                 } else {
 533                         wfRunHooks( 'ArticleUndelete', array( &$this->title, false, $comment ) );
 534                         Article::onArticleEdit( $this->title );
 535                 }
 536
 537                 if( $this->title->getNamespace() == NS_FILE ) {
 538                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 539                         $update->doUpdate();
 540                 }
 541
 542                 return $restored;
 543         }
 544
 545         /**
 546          * @return Status
 547          */
 548         function getFileStatus() { return $this->fileStatus; }
 549 }
 550
 551 /**
 552  * Special page allowing users with the appropriate permissions to view
 553  * and restore deleted content.
 554  *
 555  * @ingroup SpecialPage
 556  */
 557 class SpecialUndelete extends SpecialPage {
 558         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj, $mFile;
 559         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 560
 561         function __construct( $request = null ) {
 562                 parent::__construct( 'Undelete', 'deletedhistory' );
 563
 564                 if ( $request === null ) {
 565                         global $wgRequest;
 566                         $this->mRequest = $wgRequest;
 567                 } else {
 568                         $this->mRequest = $request;
 569                 }
 570         }
 571
 572         function loadRequest() {
 573                 global $wgUser;
 574                 $this->mAction = $this->mRequest->getVal( 'action' );
 575                 $this->mTarget = $this->mRequest->getVal( 'target' );
 576                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 577                 $time = $this->mRequest->getVal( 'timestamp' );
 578                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 579                 $this->mFile = $this->mRequest->getVal( 'file' );
 580
 581                 $posted = $this->mRequest->wasPosted() &&
 582                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 583                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 584                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 585                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 586                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 587                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 588                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 589                 $this->mToken = $this->mRequest->getVal( 'token' );
 590
 591                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 592                         $this->mAllowed = true; // user can restore
 593                         $this->mCanView = true; // user can view content
 594                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 595                         $this->mAllowed = false; // user cannot restore
 596                         $this->mCanView = true; // user can view content
 597                 }  else { // user can only view the list of revisions
 598                         $this->mAllowed = false;
 599                         $this->mCanView = false;
 600                         $this->mTimestamp = '';
 601                         $this->mRestore = false;
 602                 }
 603
 604                 if( $this->mRestore || $this->mInvert ) {
 605                         $timestamps = array();
 606                         $this->mFileVersions = array();
 607                         foreach( $_REQUEST as $key => $val ) {
 608                                 $matches = array();
 609                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 610                                         array_push( $timestamps, $matches[1] );
 611                                 }
 612
 613                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 614                                         $this->mFileVersions[] = intval( $matches[1] );
 615                                 }
 616                         }
 617                         rsort( $timestamps );
 618                         $this->mTargetTimestamp = $timestamps;
 619                 }
 620         }
 621
 622         function execute( $par ) {
 623                 global $wgOut, $wgUser;
 624
 625                 $this->setHeaders();
 626                 if ( !$this->userCanExecute( $wgUser ) ) {
 627                         $this->displayRestrictionError();
 628                         return;
 629                 }
 630                 $this->outputHeader();
 631
 632                 $this->loadRequest();
 633
 634                 if ( $this->mAllowed ) {
 635                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 636                 } else {
 637                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 638                 }
 639
 640                 if( $par != '' ) {
 641                         $this->mTarget = $par;
 642                 }
 643                 if ( $this->mTarget !== '' ) {
 644                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 645                         $wgUser->getSkin()->setRelevantTitle( $this->mTargetObj );
 646                 } else {
 647                         $this->mTargetObj = null;
 648                 }
 649
 650                 if( is_null( $this->mTargetObj ) ) {
 651                 # Not all users can just browse every deleted page from the list
 652                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 653                                 $this->showSearchForm();
 654
 655                                 # List undeletable articles
 656                                 if( $this->mSearchPrefix ) {
 657                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 658                                         $this->showList( $result );
 659                                 }
 660                         } else {
 661                                 $wgOut->addWikiMsg( 'undelete-header' );
 662                         }
 663                         return;
 664                 }
 665                 if( $this->mTimestamp !== '' ) {
 666                         return $this->showRevision( $this->mTimestamp );
 667                 }
 668                 if( $this->mFile !== null ) {
 669                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 670                         // Check if user is allowed to see this file
 671                         if ( !$file->exists() ) {
 672                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFile );
 673                                 return;
 674                         } else if( !$file->userCan( File::DELETED_FILE ) ) {
 675                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 676                                         $wgOut->permissionRequired( 'suppressrevision' );
 677                                 } else {
 678                                         $wgOut->permissionRequired( 'deletedtext' );
 679                                 }
 680                                 return false;
 681                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFile ) ) {
 682                                 $this->showFileConfirmationForm( $this->mFile );
 683                                 return false;
 684                         } else {
 685                                 return $this->showFile( $this->mFile );
 686                         }
 687                 }
 688                 if( $this->mRestore && $this->mAction == "submit" ) {
 689                         global $wgUploadMaintenance;
 690                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 691                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 692                                 return;
 693                         }
 694                         return $this->undelete();
 695                 }
 696                 if( $this->mInvert && $this->mAction == "submit" ) {
 697                         return $this->showHistory( );
 698                 }
 699                 return $this->showHistory();
 700         }
 701
 702         function showSearchForm() {
 703                 global $wgOut, $wgScript;
 704                 $wgOut->addWikiMsg( 'undelete-header' );
 705
 706                 $wgOut->addHTML(
 707                         Xml::openElement( 'form', array(
 708                                 'method' => 'get',
 709                                 'action' => $wgScript ) ) .
 710                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 711                         Html::hidden( 'title',
 712                                 $this->getTitle()->getPrefixedDbKey() ) .
 713                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 714                                 'prefix', 'prefix', 20,
 715                                 $this->mSearchPrefix ) . ' ' .
 716                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 717                         Xml::closeElement( 'fieldset' ) .
 718                         Xml::closeElement( 'form' )
 719                 );
 720         }
 721
 722         // Generic list of deleted pages
 723         private function showList( $result ) {
 724                 global $wgLang, $wgUser, $wgOut;
 725
 726                 if( $result->numRows() == 0 ) {
 727                         $wgOut->addWikiMsg( 'undelete-no-results' );
 728                         return;
 729                 }
 730
 731                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 732
 733                 $sk = $wgUser->getSkin();
 734                 $undelete = $this->getTitle();
 735                 $wgOut->addHTML( "<ul>\n" );
 736                 foreach ( $result as $row ) {
 737                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 738                         $link = $sk->linkKnown(
 739                                 $undelete,
 740                                 htmlspecialchars( $title->getPrefixedText() ),
 741                                 array(),
 742                                 array( 'target' => $title->getPrefixedText() )
 743                         );
 744                         $revs = wfMsgExt( 'undeleterevisions',
 745                                 array( 'parseinline' ),
 746                                 $wgLang->formatNum( $row->count ) );
 747                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 748                 }
 749                 $result->free();
 750                 $wgOut->addHTML( "</ul>\n" );
 751
 752                 return true;
 753         }
 754
 755         private function showRevision( $timestamp ) {
 756                 global $wgLang, $wgUser, $wgOut;
 757
 758                 $skin = $wgUser->getSkin();
 759
 760                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 761
 762                 $archive = new PageArchive( $this->mTargetObj );
 763                 $rev = $archive->getRevision( $timestamp );
 764
 765                 if( !$rev ) {
 766                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 767                         return;
 768                 }
 769
 770                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 771                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 772                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 773                                 return;
 774                         } else {
 775                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 776                                 $wgOut->addHTML( '<br />' );
 777                                 // and we are allowed to see...
 778                         }
 779                 }
 780
 781                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 782
 783                 $link = $skin->linkKnown(
 784                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 785                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 786                 );
 787
 788                 if( $this->mDiff ) {
 789                         $previousRev = $archive->getPreviousRevision( $timestamp );
 790                         if( $previousRev ) {
 791                                 $this->showDiff( $previousRev, $rev );
 792                                 if( $wgUser->getOption( 'diffonly' ) ) {
 793                                         return;
 794                                 } else {
 795                                         $wgOut->addHTML( '<hr />' );
 796                                 }
 797                         } else {
 798                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 799                         }
 800                 }
 801
 802                 // date and time are separate parameters to facilitate localisation.
 803                 // $time is kept for backward compat reasons.
 804                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 805                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 806                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 807                 $user = $skin->revUserTools( $rev );
 808
 809                 if( $this->mPreview ) {
 810                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 811                 } else {
 812                         $openDiv = '<div id="mw-undelete-revision">';
 813                 }
 814                 $wgOut->addHTML( $openDiv );
 815
 816                 // Revision delete links
 817                 if ( !$this->mDiff ) {
 818                         $revdel = $this->revDeleteLink( $rev );
 819                         if ( $revdel ) {
 820                                 $wgOut->addHTML( $revdel );
 821                         }
 822                 }
 823
 824                 $wgOut->addWikiMsgArray( 'undelete-revision', array( $link, $time, $user, $d, $t ), array( 'replaceafter' ) );
 825                 $wgOut->addHTML( '</div>' );
 826                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 827
 828                 if( $this->mPreview ) {
 829                         //Hide [edit]s
 830                         $popts = $wgOut->parserOptions();
 831                         $popts->setEditSection( false );
 832                         $wgOut->parserOptions( $popts );
 833                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 834                 }
 835
 836                 $wgOut->addHTML(
 837                         Xml::element( 'textarea', array(
 838                                         'readonly' => 'readonly',
 839                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 840                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 841                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 842                         Xml::openElement( 'div' ) .
 843                         Xml::openElement( 'form', array(
 844                                 'method' => 'post',
 845                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 846                         Xml::element( 'input', array(
 847                                 'type' => 'hidden',
 848                                 'name' => 'target',
 849                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 850                         Xml::element( 'input', array(
 851                                 'type' => 'hidden',
 852                                 'name' => 'timestamp',
 853                                 'value' => $timestamp ) ) .
 854                         Xml::element( 'input', array(
 855                                 'type' => 'hidden',
 856                                 'name' => 'wpEditToken',
 857                                 'value' => $wgUser->editToken() ) ) .
 858                         Xml::element( 'input', array(
 859                                 'type' => 'submit',
 860                                 'name' => 'preview',
 861                                 'value' => wfMsg( 'showpreview' ) ) ) .
 862                         Xml::element( 'input', array(
 863                                 'name' => 'diff',
 864                                 'type' => 'submit',
 865                                 'value' => wfMsg( 'showdiff' ) ) ) .
 866                         Xml::closeElement( 'form' ) .
 867                         Xml::closeElement( 'div' ) );
 868         }
 869
 870         /**
 871          * Get a revision-deletion link, or disabled link, or nothing, depending
 872          * on user permissions & the settings on the revision.
 873          *
 874          * Will use forward-compatible revision ID in the Special:RevDelete link
 875          * if possible, otherwise the timestamp-based ID which may break after
 876          * undeletion.
 877          *
 878          * @param Revision $rev
 879          * @return string HTML fragment
 880          */
 881         function revDeleteLink( $rev ) {
 882                 global $wgUser;
 883                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 884                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' )) ) {
 885                         $skin = $wgUser->getSkin();
 886                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 887                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 888                         } else {
 889                                 if ( $rev->getId() ) {
 890                                         // RevDelete links using revision ID are stable across
 891                                         // page deletion and undeletion; use when possible.
 892                                         $query = array(
 893                                                 'type'   => 'revision',
 894                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 895                                                 'ids'    => $rev->getId()
 896                                         );
 897                                 } else {
 898                                         // Older deleted entries didn't save a revision ID.
 899                                         // We have to refer to these by timestamp, ick!
 900                                         $query = array(
 901                                                 'type'   => 'archive',
 902                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 903                                                 'ids'    => $rev->getTimestamp()
 904                                         );
 905                                 }
 906                                 return $skin->revDeleteLink( $query,
 907                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 908                         }
 909                 } else {
 910                         return '';
 911                 }
 912         }
 913
 914         /**
 915          * Build a diff display between this and the previous either deleted
 916          * or non-deleted edit.
 917          *
 918          * @param $previousRev Revision
 919          * @param $currentRev Revision
 920          * @return String: HTML
 921          */
 922         function showDiff( $previousRev, $currentRev ) {
 923                 global $wgOut;
 924
 925                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 926                 $diffEngine->showDiffStyle();
 927                 $wgOut->addHTML(
 928                         "<div>" .
 929                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 930                         "<col class='diff-marker' />" .
 931                         "<col class='diff-content' />" .
 932                         "<col class='diff-marker' />" .
 933                         "<col class='diff-content' />" .
 934                         "<tr>" .
 935                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 936                                 $this->diffHeader( $previousRev, 'o' ) .
 937                                 "</td>\n" .
 938                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 939                                 $this->diffHeader( $currentRev, 'n' ) .
 940                                 "</td>\n" .
 941                         "</tr>" .
 942                         $diffEngine->generateDiffBody(
 943                                 $previousRev->getText(), $currentRev->getText() ) .
 944                         "</table>" .
 945                         "</div>\n"
 946                 );
 947         }
 948
 949         /**
 950          * @param $rev Revision
 951          * @param  $prefix
 952          * @return string
 953          */
 954         private function diffHeader( $rev, $prefix ) {
 955                 global $wgUser, $wgLang;
 956                 $sk = $wgUser->getSkin();
 957                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 958                 if( $isDeleted ) {
 959                         /// @todo Fixme: $rev->getTitle() is null for deleted revs...?
 960                         $targetPage = $this->getTitle();
 961                         $targetQuery = array(
 962                                 'target' => $this->mTargetObj->getPrefixedText(),
 963                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 964                         );
 965                 } else {
 966                         /// @todo Fixme getId() may return non-zero for deleted revs...
 967                         $targetPage = $rev->getTitle();
 968                         $targetQuery = array( 'oldid' => $rev->getId() );
 969                 }
 970                 // Add show/hide deletion links if available
 971                 $del .= $this->revDeleteLink( $rev );
 972                 return
 973                         '<div id="mw-diff-'.$prefix.'title1"><strong>' .
 974                                 $sk->link(
 975                                         $targetPage,
 976                                         wfMsgHtml(
 977                                                 'revisionasof',
 978                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 979                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
 980                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
 981                                         ),
 982                                         array(),
 983                                         $targetQuery
 984                                 ) .
 985                         '</strong></div>' .
 986                         '<div id="mw-diff-'.$prefix.'title2">' .
 987                                 $sk->revUserTools( $rev ) . '<br />' .
 988                         '</div>' .
 989                         '<div id="mw-diff-'.$prefix.'title3">' .
 990                                 $sk->revComment( $rev ) . $del . '<br />' .
 991                         '</div>';
 992         }
 993
 994         /**
 995          * Show a form confirming whether a tokenless user really wants to see a file
 996          */
 997         private function showFileConfirmationForm( $key ) {
 998                 global $wgOut, $wgUser, $wgLang;
 999                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
1000                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
1001                         $this->mTargetObj->getText(),
1002                         $wgLang->date( $file->getTimestamp() ),
1003                         $wgLang->time( $file->getTimestamp() ) );
1004                 $wgOut->addHTML(
1005                         Xml::openElement( 'form', array(
1006                                 'method' => 'POST',
1007                                 'action' => $this->getTitle()->getLocalUrl(
1008                                         'target=' . urlencode( $this->mTarget ) .
1009                                         '&file=' . urlencode( $key ) .
1010                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
1011                                 )
1012                         ) .
1013                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
1014                         '</form>'
1015                 );
1016         }
1017
1018         /**
1019          * Show a deleted file version requested by the visitor.
1020          */
1021         private function showFile( $key ) {
1022                 global $wgOut, $wgRequest;
1023                 $wgOut->disable();
1024
1025                 # We mustn't allow the output to be Squid cached, otherwise
1026                 # if an admin previews a deleted image, and it's cached, then
1027                 # a user without appropriate permissions can toddle off and
1028                 # nab the image, and Squid will serve it
1029                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1030                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1031                 $wgRequest->response()->header( 'Pragma: no-cache' );
1032
1033                 global $IP;
1034                 require_once( "$IP/includes/StreamFile.php" );
1035                 $repo = RepoGroup::singleton()->getLocalRepo();
1036                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1037                 wfStreamFile( $path );
1038         }
1039
1040         private function showHistory( ) {
1041                 global $wgUser, $wgOut;
1042
1043                 $sk = $wgUser->getSkin();
1044                 if( $this->mAllowed ) {
1045                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
1046                 } else {
1047                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
1048                 }
1049
1050                 $wgOut->wrapWikiMsg(  "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n", array ( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() ) );
1051
1052                 $archive = new PageArchive( $this->mTargetObj );
1053                 /*
1054                 $text = $archive->getLastRevisionText();
1055                 if( is_null( $text ) ) {
1056                         $wgOut->addWikiMsg( "nohistory" );
1057                         return;
1058                 }
1059                 */
1060                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1061                 if ( $this->mAllowed ) {
1062                         $wgOut->addWikiMsg( "undeletehistory" );
1063                         $wgOut->addWikiMsg( "undeleterevdel" );
1064                 } else {
1065                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
1066                 }
1067                 $wgOut->addHTML( '</div>' );
1068
1069                 # List all stored revisions
1070                 $revisions = $archive->listRevisions();
1071                 $files = $archive->listFiles();
1072
1073                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1074                 $haveFiles = $files && $files->numRows() > 0;
1075
1076                 # Batch existence check on user and talk pages
1077                 if( $haveRevisions ) {
1078                         $batch = new LinkBatch();
1079                         foreach ( $revisions as $row ) {
1080                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1081                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1082                         }
1083                         $batch->execute();
1084                         $revisions->seek( 0 );
1085                 }
1086                 if( $haveFiles ) {
1087                         $batch = new LinkBatch();
1088                         foreach ( $files as $row ) {
1089                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1090                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1091                         }
1092                         $batch->execute();
1093                         $files->seek( 0 );
1094                 }
1095
1096                 if ( $this->mAllowed ) {
1097                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1098                         # Start the form here
1099                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1100                         $wgOut->addHTML( $top );
1101                 }
1102
1103                 # Show relevant lines from the deletion log:
1104                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1105                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1106                 # Show relevant lines from the suppression log:
1107                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1108                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1109                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1110                 }
1111
1112                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1113                         # Format the user-visible controls (comment field, submission button)
1114                         # in a nice little table
1115                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1116                                 $unsuppressBox =
1117                                         "<tr>
1118                                                 <td>&#160;</td>
1119                                                 <td class='mw-input'>" .
1120                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
1121                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1122                                                 "</td>
1123                                         </tr>";
1124                         } else {
1125                                 $unsuppressBox = "";
1126                         }
1127                         $table =
1128                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1129                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1130                                         "<tr>
1131                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1132                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1133                                                 "</td>
1134                                         </tr>
1135                                         <tr>
1136                                                 <td class='mw-label'>" .
1137                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1138                                                 "</td>
1139                                                 <td class='mw-input'>" .
1140                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1141                                                 "</td>
1142                                         </tr>
1143                                         <tr>
1144                                                 <td>&#160;</td>
1145                                                 <td class='mw-submit'>" .
1146                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1147                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) . ' ' .
1148                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1149                                                 "</td>
1150                                         </tr>" .
1151                                         $unsuppressBox .
1152                                 Xml::closeElement( 'table' ) .
1153                                 Xml::closeElement( 'fieldset' );
1154
1155                         $wgOut->addHTML( $table );
1156                 }
1157
1158                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1159
1160                 if( $haveRevisions ) {
1161                         # The page's stored (deleted) history:
1162                         $wgOut->addHTML("<ul>");
1163                         $remaining = $revisions->numRows();
1164                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1165
1166                         foreach ( $revisions as $row ) {
1167                                 $remaining--;
1168                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1169                         }
1170                         $revisions->free();
1171                         $wgOut->addHTML("</ul>");
1172                 } else {
1173                         $wgOut->addWikiMsg( "nohistory" );
1174                 }
1175
1176                 if( $haveFiles ) {
1177                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1178                         $wgOut->addHTML( "<ul>" );
1179                         foreach ( $files as $row ) {
1180                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1181                         }
1182                         $files->free();
1183                         $wgOut->addHTML( "</ul>" );
1184                 }
1185
1186                 if ( $this->mAllowed ) {
1187                         # Slip in the hidden controls here
1188                         $misc  = Html::hidden( 'target', $this->mTarget );
1189                         $misc .= Html::hidden( 'wpEditToken', $wgUser->editToken() );
1190                         $misc .= Xml::closeElement( 'form' );
1191                         $wgOut->addHTML( $misc );
1192                 }
1193
1194                 return true;
1195         }
1196
1197         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1198                 global $wgLang;
1199
1200                 $rev = Revision::newFromArchiveRow( $row,
1201                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1202                 $stxt = '';
1203                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1204                 // Build checkboxen...
1205                 if( $this->mAllowed ) {
1206                         if( $this->mInvert ) {
1207                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1208                                         $checkBox = Xml::check( "ts$ts");
1209                                 } else {
1210                                         $checkBox = Xml::check( "ts$ts", true );
1211                                 }
1212                         } else {
1213                                 $checkBox = Xml::check( "ts$ts" );
1214                         }
1215                 } else {
1216                         $checkBox = '';
1217                 }
1218                 // Build page & diff links...
1219                 if( $this->mCanView ) {
1220                         $titleObj = $this->getTitle();
1221                         # Last link
1222                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1223                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1224                                 $last = wfMsgHtml('diff');
1225                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1226                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1227                                 $last = $sk->linkKnown(
1228                                         $titleObj,
1229                                         wfMsgHtml('diff'),
1230                                         array(),
1231                                         array(
1232                                                 'target' => $this->mTargetObj->getPrefixedText(),
1233                                                 'timestamp' => $ts,
1234                                                 'diff' => 'prev'
1235                                         )
1236                                 );
1237                         } else {
1238                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1239                                 $last = wfMsgHtml('diff');
1240                         }
1241                 } else {
1242                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1243                         $last = wfMsgHtml('diff');
1244                 }
1245                 // User links
1246                 $userLink = $sk->revUserTools( $rev );
1247                 // Revision text size
1248                 if( !is_null($size = $row->ar_len) ) {
1249                         $stxt = $sk->formatRevisionSize( $size );
1250                 }
1251                 // Edit summary
1252                 $comment = $sk->revComment( $rev );
1253                 // Revision delete links
1254                 $revdlink = $this->revDeleteLink( $rev );
1255                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1256         }
1257
1258         private function formatFileRow( $row, $sk ) {
1259                 global $wgUser, $wgLang;
1260
1261                 $file = ArchivedFile::newFromRow( $row );
1262
1263                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1264                 if( $this->mAllowed && $row->fa_storage_key ) {
1265                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1266                         $key = urlencode( $row->fa_storage_key );
1267                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1268                 } else {
1269                         $checkBox = '';
1270                         $pageLink = $wgLang->timeanddate( $ts, true );
1271                 }
1272                 $userLink = $this->getFileUser( $file, $sk );
1273                 $data =
1274                         wfMsg( 'widthheight',
1275                                 $wgLang->formatNum( $row->fa_width ),
1276                                 $wgLang->formatNum( $row->fa_height ) ) .
1277                         ' (' .
1278                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1279                         ')';
1280                 $data = htmlspecialchars( $data );
1281                 $comment = $this->getFileComment( $file, $sk );
1282                 // Add show/hide deletion links if available
1283                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1284                 if( $canHide || ( $file->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1285                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1286                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1287                         } else {
1288                                 $query = array(
1289                                         'type' => 'filearchive',
1290                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1291                                         'ids' => $row->fa_id
1292                                 );
1293                                 $revdlink = $sk->revDeleteLink( $query,
1294                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1295                         }
1296                 } else {
1297                         $revdlink = '';
1298                 }
1299                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1300         }
1301
1302         /**
1303          * Fetch revision text link if it's available to all users
1304          *
1305          * @param $rev Revision
1306          * @param $sk Skin
1307          * @return string
1308          */
1309         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1310                 global $wgLang;
1311
1312                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1313
1314                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1315                         return '<span class="history-deleted">' . $time . '</span>';
1316                 } else {
1317                         $link = $sk->linkKnown(
1318                                 $titleObj,
1319                                 $time,
1320                                 array(),
1321                                 array(
1322                                         'target' => $this->mTargetObj->getPrefixedText(),
1323                                         'timestamp' => $ts
1324                                 )
1325                         );
1326                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1327                                 $link = '<span class="history-deleted">' . $link . '</span>';
1328                         return $link;
1329                 }
1330         }
1331
1332         /**
1333          * Fetch image view link if it's available to all users
1334          *
1335          * @param $file File
1336          * @param $sk Skin
1337          * @return String: HTML fragment
1338          */
1339         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1340                 global $wgLang, $wgUser;
1341
1342                 if( !$file->userCan( File::DELETED_FILE ) ) {
1343                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1344                 } else {
1345                         $link = $sk->linkKnown(
1346                                 $titleObj,
1347                                 $wgLang->timeanddate( $ts, true ),
1348                                 array(),
1349                                 array(
1350                                         'target' => $this->mTargetObj->getPrefixedText(),
1351                                         'file' => $key,
1352                                         'token' => $wgUser->editToken( $key )
1353                                 )
1354                         );
1355                         if( $file->isDeleted(File::DELETED_FILE) )
1356                                 $link = '<span class="history-deleted">' . $link . '</span>';
1357                         return $link;
1358                 }
1359         }
1360
1361         /**
1362          * Fetch file's user id if it's available to this user
1363          *
1364          * @param $file File
1365          * @param $sk Skin
1366          * @return String: HTML fragment
1367          */
1368         function getFileUser( $file, $sk ) {
1369                 if( !$file->userCan( File::DELETED_USER ) ) {
1370                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1371                 } else {
1372                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1373                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1374                         if( $file->isDeleted( File::DELETED_USER ) )
1375                                 $link = '<span class="history-deleted">' . $link . '</span>';
1376                         return $link;
1377                 }
1378         }
1379
1380         /**
1381          * Fetch file upload comment if it's available to this user
1382          *
1383          * @param $file File
1384          * @param $sk Skin
1385          * @return String: HTML fragment
1386          */
1387         function getFileComment( $file, $sk ) {
1388                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1389                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1390                 } else {
1391                         $link = $sk->commentBlock( $file->getRawDescription() );
1392                         if( $file->isDeleted(File::DELETED_COMMENT) )
1393                                 $link = '<span class="history-deleted">' . $link . '</span>';
1394                         return $link;
1395                 }
1396         }
1397
1398         function undelete() {
1399                 global $wgOut, $wgUser;
1400                 if ( wfReadOnly() ) {
1401                         $wgOut->readOnlyPage();
1402                         return;
1403                 }
1404                 if( !is_null( $this->mTargetObj ) ) {
1405                         $archive = new PageArchive( $this->mTargetObj );
1406                         $ok = $archive->undelete(
1407                                 $this->mTargetTimestamp,
1408                                 $this->mComment,
1409                                 $this->mFileVersions,
1410                                 $this->mUnsuppress );
1411
1412                         if( is_array($ok) ) {
1413                                 if ( $ok[1] ) // Undeleted file count
1414                                         wfRunHooks( 'FileUndeleteComplete', array(
1415                                                 $this->mTargetObj, $this->mFileVersions,
1416                                                 $wgUser, $this->mComment) );
1417
1418                                 $skin = $wgUser->getSkin();
1419                                 $link = $skin->linkKnown( $this->mTargetObj );
1420                                 $wgOut->addWikiMsgArray( 'undeletedpage', array( $link ), array( 'replaceafter' ) );
1421                         } else {
1422                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1423                                 $wgOut->addWikiMsg( 'undeleterevdel' );
1424                         }
1425
1426                         // Show file deletion warnings and errors
1427                         $status = $archive->getFileStatus();
1428                         if( $status && !$status->isGood() ) {
1429                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1430                         }
1431                 } else {
1432                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1433                 }
1434                 return false;
1435         }
1436 }