includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30
  31         /**
  32          * @var Title
  33          */
  34         protected $title;
  35         var $fileStatus;
  36
  37         function __construct( $title ) {
  38                 if( is_null( $title ) ) {
  39                         throw new MWException( __METHOD__ . ' given a null title.' );
  40                 }
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * List all deleted pages recorded in the archive table. Returns result
  46          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  47          * namespace/title.
  48          *
  49          * @return ResultWrapper
  50          */
  51         public static function listAllPages() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53                 return self::listPages( $dbr, '' );
  54         }
  55
  56         /**
  57          * List deleted pages recorded in the archive table matching the
  58          * given title prefix.
  59          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  60          *
  61          * @param $prefix String: title prefix
  62          * @return ResultWrapper
  63          */
  64         public static function listPagesByPrefix( $prefix ) {
  65                 $dbr = wfGetDB( DB_SLAVE );
  66
  67                 $title = Title::newFromText( $prefix );
  68                 if( $title ) {
  69                         $ns = $title->getNamespace();
  70                         $prefix = $title->getDBkey();
  71                 } else {
  72                         // Prolly won't work too good
  73                         // @todo handle bare namespace names cleanly?
  74                         $ns = 0;
  75                 }
  76                 $conds = array(
  77                         'ar_namespace' => $ns,
  78                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  79                 );
  80                 return self::listPages( $dbr, $conds );
  81         }
  82
  83         /**
  84          * @param $dbr DatabaseBase
  85          * @param $condition
  86          * @return bool|ResultWrapper
  87          */
  88         protected static function listPages( $dbr, $condition ) {
  89                 return $dbr->resultObject(
  90                         $dbr->select(
  91                                 array( 'archive' ),
  92                                 array(
  93                                         'ar_namespace',
  94                                         'ar_title',
  95                                         'COUNT(*) AS count'
  96                                 ),
  97                                 $condition,
  98                                 __METHOD__,
  99                                 array(
 100                                         'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 101                                         'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 102                                         'LIMIT' => 100,
 103                                 )
 104                         )
 105                 );
 106         }
 107
 108         /**
 109          * List the revisions of the given page. Returns result wrapper with
 110          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 111          *
 112          * @return ResultWrapper
 113          */
 114         function listRevisions() {
 115                 $dbr = wfGetDB( DB_SLAVE );
 116                 $res = $dbr->select( 'archive',
 117                         array(
 118                                 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 119                                 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1'
 120                         ),
 121                         array( 'ar_namespace' => $this->title->getNamespace(),
 122                                    'ar_title' => $this->title->getDBkey() ),
 123                         'PageArchive::listRevisions',
 124                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 125                 $ret = $dbr->resultObject( $res );
 126                 return $ret;
 127         }
 128
 129         /**
 130          * List the deleted file revisions for this page, if it's a file page.
 131          * Returns a result wrapper with various filearchive fields, or null
 132          * if not a file page.
 133          *
 134          * @return ResultWrapper
 135          * @todo Does this belong in Image for fuller encapsulation?
 136          */
 137         function listFiles() {
 138                 if( $this->title->getNamespace() == NS_FILE ) {
 139                         $dbr = wfGetDB( DB_SLAVE );
 140                         $res = $dbr->select( 'filearchive',
 141                                 array(
 142                                         'fa_id',
 143                                         'fa_name',
 144                                         'fa_archive_name',
 145                                         'fa_storage_key',
 146                                         'fa_storage_group',
 147                                         'fa_size',
 148                                         'fa_width',
 149                                         'fa_height',
 150                                         'fa_bits',
 151                                         'fa_metadata',
 152                                         'fa_media_type',
 153                                         'fa_major_mime',
 154                                         'fa_minor_mime',
 155                                         'fa_description',
 156                                         'fa_user',
 157                                         'fa_user_text',
 158                                         'fa_timestamp',
 159                                         'fa_deleted' ),
 160                                 array( 'fa_name' => $this->title->getDBkey() ),
 161                                 __METHOD__,
 162                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 163                         $ret = $dbr->resultObject( $res );
 164                         return $ret;
 165                 }
 166                 return null;
 167         }
 168
 169         /**
 170          * Return a Revision object containing data for the deleted revision.
 171          * Note that the result *may* or *may not* have a null page ID.
 172          *
 173          * @param $timestamp String
 174          * @return Revision
 175          */
 176         function getRevision( $timestamp ) {
 177                 $dbr = wfGetDB( DB_SLAVE );
 178                 $row = $dbr->selectRow( 'archive',
 179                         array(
 180                                 'ar_rev_id',
 181                                 'ar_text',
 182                                 'ar_comment',
 183                                 'ar_user',
 184                                 'ar_user_text',
 185                                 'ar_timestamp',
 186                                 'ar_minor_edit',
 187                                 'ar_flags',
 188                                 'ar_text_id',
 189                                 'ar_deleted',
 190                                 'ar_len',
 191                                 'ar_sha1',
 192                         ),
 193                         array( 'ar_namespace' => $this->title->getNamespace(),
 194                                         'ar_title' => $this->title->getDBkey(),
 195                                         'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 196                         __METHOD__ );
 197                 if( $row ) {
 198                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleID() ) );
 199                 } else {
 200                         return null;
 201                 }
 202         }
 203
 204         /**
 205          * Return the most-previous revision, either live or deleted, against
 206          * the deleted revision given by timestamp.
 207          *
 208          * May produce unexpected results in case of history merges or other
 209          * unusual time issues.
 210          *
 211          * @param $timestamp String
 212          * @return Revision or null
 213          */
 214         function getPreviousRevision( $timestamp ) {
 215                 $dbr = wfGetDB( DB_SLAVE );
 216
 217                 // Check the previous deleted revision...
 218                 $row = $dbr->selectRow( 'archive',
 219                         'ar_timestamp',
 220                         array( 'ar_namespace' => $this->title->getNamespace(),
 221                                    'ar_title' => $this->title->getDBkey(),
 222                                    'ar_timestamp < ' .
 223                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 224                         __METHOD__,
 225                         array(
 226                                 'ORDER BY' => 'ar_timestamp DESC',
 227                                 'LIMIT' => 1 ) );
 228                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 229
 230                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 231                         array( 'rev_id', 'rev_timestamp' ),
 232                         array(
 233                                 'page_namespace' => $this->title->getNamespace(),
 234                                 'page_title' => $this->title->getDBkey(),
 235                                 'page_id = rev_page',
 236                                 'rev_timestamp < ' .
 237                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 238                         __METHOD__,
 239                         array(
 240                                 'ORDER BY' => 'rev_timestamp DESC',
 241                                 'LIMIT' => 1 ) );
 242                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 243                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 244
 245                 if( $prevLive && $prevLive > $prevDeleted ) {
 246                         // Most prior revision was live
 247                         return Revision::newFromId( $prevLiveId );
 248                 } elseif( $prevDeleted ) {
 249                         // Most prior revision was deleted
 250                         return $this->getRevision( $prevDeleted );
 251                 } else {
 252                         // No prior revision on this page.
 253                         return null;
 254                 }
 255         }
 256
 257         /**
 258          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 259          *
 260          * @param $row Object: database row
 261          * @return Revision
 262          */
 263         function getTextFromRow( $row ) {
 264                 if( is_null( $row->ar_text_id ) ) {
 265                         // An old row from MediaWiki 1.4 or previous.
 266                         // Text is embedded in this row in classic compression format.
 267                         return Revision::getRevisionText( $row, 'ar_' );
 268                 } else {
 269                         // New-style: keyed to the text storage backend.
 270                         $dbr = wfGetDB( DB_SLAVE );
 271                         $text = $dbr->selectRow( 'text',
 272                                 array( 'old_text', 'old_flags' ),
 273                                 array( 'old_id' => $row->ar_text_id ),
 274                                 __METHOD__ );
 275                         return Revision::getRevisionText( $text );
 276                 }
 277         }
 278
 279         /**
 280          * Fetch (and decompress if necessary) the stored text of the most
 281          * recently edited deleted revision of the page.
 282          *
 283          * If there are no archived revisions for the page, returns NULL.
 284          *
 285          * @return String
 286          */
 287         function getLastRevisionText() {
 288                 $dbr = wfGetDB( DB_SLAVE );
 289                 $row = $dbr->selectRow( 'archive',
 290                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 291                         array( 'ar_namespace' => $this->title->getNamespace(),
 292                                    'ar_title' => $this->title->getDBkey() ),
 293                         __METHOD__,
 294                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 295                 if( $row ) {
 296                         return $this->getTextFromRow( $row );
 297                 } else {
 298                         return null;
 299                 }
 300         }
 301
 302         /**
 303          * Quick check if any archived revisions are present for the page.
 304          *
 305          * @return Boolean
 306          */
 307         function isDeleted() {
 308                 $dbr = wfGetDB( DB_SLAVE );
 309                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 310                         array( 'ar_namespace' => $this->title->getNamespace(),
 311                                    'ar_title' => $this->title->getDBkey() ) );
 312                 return ( $n > 0 );
 313         }
 314
 315         /**
 316          * Restore the given (or all) text and file revisions for the page.
 317          * Once restored, the items will be removed from the archive tables.
 318          * The deletion log will be updated with an undeletion notice.
 319          *
 320          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 321          * @param $comment String
 322          * @param $fileVersions Array
 323          * @param $unsuppress Boolean
 324          *
 325          * @return array(number of file revisions restored, number of image revisions restored, log message)
 326          * on success, false on failure
 327          */
 328         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 329                 // If both the set of text revisions and file revisions are empty,
 330                 // restore everything. Otherwise, just restore the requested items.
 331                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 332
 333                 $restoreText = $restoreAll || !empty( $timestamps );
 334                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 335
 336                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 337                         $img = wfLocalFile( $this->title );
 338                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 339                         if ( !$this->fileStatus->isOk() ) {
 340                                 return false;
 341                         }
 342                         $filesRestored = $this->fileStatus->successCount;
 343                 } else {
 344                         $filesRestored = 0;
 345                 }
 346
 347                 if( $restoreText ) {
 348                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 349                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 350                                 return false;
 351                         }
 352                 } else {
 353                         $textRestored = 0;
 354                 }
 355
 356                 // Touch the log!
 357                 global $wgContLang;
 358                 $log = new LogPage( 'delete' );
 359
 360                 if( $textRestored && $filesRestored ) {
 361                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 362                                 $wgContLang->formatNum( $textRestored ),
 363                                 $wgContLang->formatNum( $filesRestored ) );
 364                 } elseif( $textRestored ) {
 365                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 366                                 $wgContLang->formatNum( $textRestored ) );
 367                 } elseif( $filesRestored ) {
 368                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 369                                 $wgContLang->formatNum( $filesRestored ) );
 370                 } else {
 371                         wfDebug( "Undelete: nothing undeleted...\n" );
 372                         return false;
 373                 }
 374
 375                 if( trim( $comment ) != '' ) {
 376                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 377                 }
 378                 $log->addEntry( 'restore', $this->title, $reason );
 379
 380                 return array( $textRestored, $filesRestored, $reason );
 381         }
 382
 383         /**
 384          * This is the meaty bit -- restores archived revisions of the given page
 385          * to the cur/old tables. If the page currently exists, all revisions will
 386          * be stuffed into old, otherwise the most recent will go into cur.
 387          *
 388          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 389          * @param $comment String
 390          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 391          *
 392          * @return Mixed: number of revisions restored or false on failure
 393          */
 394         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 395                 if ( wfReadOnly() ) {
 396                         return false;
 397                 }
 398                 $restoreAll = empty( $timestamps );
 399
 400                 $dbw = wfGetDB( DB_MASTER );
 401
 402                 # Does this page already exist? We'll have to update it...
 403                 $article = WikiPage::factory( $this->title );
 404                 # Load latest data for the current page (bug 31179)
 405                 $article->loadPageData( 'fromdbmaster' );
 406                 $oldcountable = $article->isCountable();
 407
 408                 $page = $dbw->selectRow( 'page',
 409                         array( 'page_id', 'page_latest' ),
 410                         array( 'page_namespace' => $this->title->getNamespace(),
 411                                    'page_title'     => $this->title->getDBkey() ),
 412                         __METHOD__,
 413                         array( 'FOR UPDATE' ) // lock page
 414                 );
 415                 if( $page ) {
 416                         $makepage = false;
 417                         # Page already exists. Import the history, and if necessary
 418                         # we'll update the latest revision field in the record.
 419                         $newid             = 0;
 420                         $pageId            = $page->page_id;
 421                         $previousRevId    = $page->page_latest;
 422                         # Get the time span of this page
 423                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 424                                 array( 'rev_id' => $previousRevId ),
 425                                 __METHOD__ );
 426                         if( $previousTimestamp === false ) {
 427                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 428                                 return 0;
 429                         }
 430                 } else {
 431                         # Have to create a new article...
 432                         $makepage = true;
 433                         $previousRevId = 0;
 434                         $previousTimestamp = 0;
 435                 }
 436
 437                 if( $restoreAll ) {
 438                         $oldones = '1 = 1'; # All revisions...
 439                 } else {
 440                         $oldts = implode( ',',
 441                                 array_map( array( &$dbw, 'addQuotes' ),
 442                                         array_map( array( &$dbw, 'timestamp' ),
 443                                                 $timestamps ) ) );
 444
 445                         $oldones = "ar_timestamp IN ( {$oldts} )";
 446                 }
 447
 448                 /**
 449                  * Select each archived revision...
 450                  */
 451                 $result = $dbw->select( 'archive',
 452                         /* fields */ array(
 453                                 'ar_rev_id',
 454                                 'ar_text',
 455                                 'ar_comment',
 456                                 'ar_user',
 457                                 'ar_user_text',
 458                                 'ar_timestamp',
 459                                 'ar_minor_edit',
 460                                 'ar_flags',
 461                                 'ar_text_id',
 462                                 'ar_deleted',
 463                                 'ar_page_id',
 464                                 'ar_len',
 465                                 'ar_sha1' ),
 466                         /* WHERE */ array(
 467                                 'ar_namespace' => $this->title->getNamespace(),
 468                                 'ar_title'     => $this->title->getDBkey(),
 469                                 $oldones ),
 470                         __METHOD__,
 471                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 472                 );
 473                 $ret = $dbw->resultObject( $result );
 474                 $rev_count = $dbw->numRows( $result );
 475                 if( !$rev_count ) {
 476                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 477                         return false; // ???
 478                 }
 479
 480                 $ret->seek( $rev_count - 1 ); // move to last
 481                 $row = $ret->fetchObject(); // get newest archived rev
 482                 $ret->seek( 0 ); // move back
 483
 484                 if( $makepage ) {
 485                         // Check the state of the newest to-be version...
 486                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 487                                 return false; // we can't leave the current revision like this!
 488                         }
 489                         // Safe to insert now...
 490                         $newid  = $article->insertOn( $dbw );
 491                         $pageId = $newid;
 492                 } else {
 493                         // Check if a deleted revision will become the current revision...
 494                         if( $row->ar_timestamp > $previousTimestamp ) {
 495                                 // Check the state of the newest to-be version...
 496                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 497                                         return false; // we can't leave the current revision like this!
 498                                 }
 499                         }
 500                 }
 501
 502                 $revision = null;
 503                 $restored = 0;
 504
 505                 foreach ( $ret as $row ) {
 506                         // Check for key dupes due to shitty archive integrity.
 507                         if( $row->ar_rev_id ) {
 508                                 $exists = $dbw->selectField( 'revision', '1',
 509                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 510                                 if( $exists ) {
 511                                         continue; // don't throw DB errors
 512                                 }
 513                         }
 514                         // Insert one revision at a time...maintaining deletion status
 515                         // unless we are specifically removing all restrictions...
 516                         $revision = Revision::newFromArchiveRow( $row,
 517                                 array(
 518                                         'page' => $pageId,
 519                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 520                                 ) );
 521
 522                         $revision->insertOn( $dbw );
 523                         $restored++;
 524
 525                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 526                 }
 527                 # Now that it's safely stored, take it out of the archive
 528                 $dbw->delete( 'archive',
 529                         /* WHERE */ array(
 530                                 'ar_namespace' => $this->title->getNamespace(),
 531                                 'ar_title' => $this->title->getDBkey(),
 532                                 $oldones ),
 533                         __METHOD__ );
 534
 535                 // Was anything restored at all?
 536                 if ( $restored == 0 ) {
 537                         return 0;
 538                 }
 539
 540                 $created = (bool)$newid;
 541
 542                 // Attach the latest revision to the page...
 543                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 544                 if ( $created || $wasnew ) {
 545                         // Update site stats, link tables, etc
 546                         $user = User::newFromName( $revision->getRawUserText(), false );
 547                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 548                 }
 549
 550                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 551
 552                 if( $this->title->getNamespace() == NS_FILE ) {
 553                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 554                         $update->doUpdate();
 555                 }
 556
 557                 return $restored;
 558         }
 559
 560         /**
 561          * @return Status
 562          */
 563         function getFileStatus() { return $this->fileStatus; }
 564 }
 565
 566 /**
 567  * Special page allowing users with the appropriate permissions to view
 568  * and restore deleted content.
 569  *
 570  * @ingroup SpecialPage
 571  */
 572 class SpecialUndelete extends SpecialPage {
 573         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 574         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 575
 576         /**
 577          * @var Title
 578          */
 579         var $mTargetObj;
 580
 581         function __construct() {
 582                 parent::__construct( 'Undelete', 'deletedhistory' );
 583         }
 584
 585         function loadRequest( $par ) {
 586                 $request = $this->getRequest();
 587                 $user = $this->getUser();
 588
 589                 $this->mAction = $request->getVal( 'action' );
 590                 if ( $par !== null && $par !== '' ) {
 591                         $this->mTarget = $par;
 592                 } else {
 593                         $this->mTarget = $request->getVal( 'target' );
 594                 }
 595                 $this->mTargetObj = null;
 596                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 597                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 598                 }
 599                 $this->mSearchPrefix = $request->getText( 'prefix' );
 600                 $time = $request->getVal( 'timestamp' );
 601                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 602                 $this->mFilename = $request->getVal( 'file' );
 603
 604                 $posted = $request->wasPosted() &&
 605                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 606                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 607                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 608                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 609                 $this->mDiff = $request->getCheck( 'diff' );
 610                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 611                 $this->mComment = $request->getText( 'wpComment' );
 612                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 613                 $this->mToken = $request->getVal( 'token' );
 614
 615                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 616                         $this->mAllowed = true; // user can restore
 617                         $this->mCanView = true; // user can view content
 618                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 619                         $this->mAllowed = false; // user cannot restore
 620                         $this->mCanView = true; // user can view content
 621                         $this->mRestore = false;
 622                 } else { // user can only view the list of revisions
 623                         $this->mAllowed = false;
 624                         $this->mCanView = false;
 625                         $this->mTimestamp = '';
 626                         $this->mRestore = false;
 627                 }
 628
 629                 if( $this->mRestore || $this->mInvert ) {
 630                         $timestamps = array();
 631                         $this->mFileVersions = array();
 632                         foreach( $request->getValues() as $key => $val ) {
 633                                 $matches = array();
 634                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 635                                         array_push( $timestamps, $matches[1] );
 636                                 }
 637
 638                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 639                                         $this->mFileVersions[] = intval( $matches[1] );
 640                                 }
 641                         }
 642                         rsort( $timestamps );
 643                         $this->mTargetTimestamp = $timestamps;
 644                 }
 645         }
 646
 647         function execute( $par ) {
 648                 $this->checkPermissions();
 649                 $user = $this->getUser();
 650
 651                 $this->setHeaders();
 652                 $this->outputHeader();
 653
 654                 $this->loadRequest( $par );
 655
 656                 $out = $this->getOutput();
 657
 658                 if ( is_null( $this->mTargetObj ) ) {
 659                         $out->addWikiMsg( 'undelete-header' );
 660
 661                         # Not all users can just browse every deleted page from the list
 662                         if ( $user->isAllowed( 'browsearchive' ) ) {
 663                                 $this->showSearchForm();
 664                         }
 665                         return;
 666                 }
 667
 668                 if ( $this->mAllowed ) {
 669                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 670                 } else {
 671                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 672                 }
 673
 674                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 675
 676                 if ( $this->mTimestamp !== '' ) {
 677                         $this->showRevision( $this->mTimestamp );
 678                 } elseif ( $this->mFilename !== null ) {
 679                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 680                         // Check if user is allowed to see this file
 681                         if ( !$file->exists() ) {
 682                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 683                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 684                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 685                                         throw new PermissionsError( 'suppressrevision' );
 686                                 } else {
 687                                         throw new PermissionsError( 'deletedtext' );
 688                                 }
 689                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 690                                 $this->showFileConfirmationForm( $this->mFilename );
 691                         } else {
 692                                 $this->showFile( $this->mFilename );
 693                         }
 694                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 695                         $this->undelete();
 696                 } else {
 697                         $this->showHistory();
 698                 }
 699         }
 700
 701         function showSearchForm() {
 702                 global $wgScript;
 703
 704                 $out = $this->getOutput();
 705                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 706                 $out->addHTML(
 707                         Xml::openElement( 'form', array(
 708                                 'method' => 'get',
 709                                 'action' => $wgScript ) ) .
 710                         Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 711                         Html::hidden( 'title',
 712                                 $this->getTitle()->getPrefixedDbKey() ) .
 713                         Xml::inputLabel( $this->msg( 'undelete-search-prefix' )->text(),
 714                                 'prefix', 'prefix', 20,
 715                                 $this->mSearchPrefix ) . ' ' .
 716                         Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 717                         Xml::closeElement( 'fieldset' ) .
 718                         Xml::closeElement( 'form' )
 719                 );
 720
 721                 # List undeletable articles
 722                 if( $this->mSearchPrefix ) {
 723                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 724                         $this->showList( $result );
 725                 }
 726         }
 727
 728         /**
 729          * Generic list of deleted pages
 730          *
 731          * @param $result ResultWrapper
 732          * @return bool
 733          */
 734         private function showList( $result ) {
 735                 $out = $this->getOutput();
 736
 737                 if( $result->numRows() == 0 ) {
 738                         $out->addWikiMsg( 'undelete-no-results' );
 739                         return;
 740                 }
 741
 742                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 743
 744                 $undelete = $this->getTitle();
 745                 $out->addHTML( "<ul>\n" );
 746                 foreach ( $result as $row ) {
 747                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 748                         if ( $title !== null ) {
 749                                 $item = Linker::linkKnown(
 750                                         $undelete,
 751                                         htmlspecialchars( $title->getPrefixedText() ),
 752                                         array(),
 753                                         array( 'target' => $title->getPrefixedText() )
 754                                 );
 755                         } else {
 756                                 // The title is no longer valid, show as text
 757                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 758                                 $item = htmlspecialchars( $title->getPrefixedText() );
 759                         }
 760                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 761                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 762                 }
 763                 $result->free();
 764                 $out->addHTML( "</ul>\n" );
 765
 766                 return true;
 767         }
 768
 769         private function showRevision( $timestamp ) {
 770                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 771                         return 0;
 772                 }
 773
 774                 $archive = new PageArchive( $this->mTargetObj );
 775                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 776                 $rev = $archive->getRevision( $timestamp );
 777
 778                 $out = $this->getOutput();
 779                 $user = $this->getUser();
 780
 781                 if( !$rev ) {
 782                         $out->addWikiMsg( 'undeleterevision-missing' );
 783                         return;
 784                 }
 785
 786                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 787                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 788                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 789                                 return;
 790                         } else {
 791                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 792                                 $out->addHTML( '<br />' );
 793                                 // and we are allowed to see...
 794                         }
 795                 }
 796
 797                 if( $this->mDiff ) {
 798                         $previousRev = $archive->getPreviousRevision( $timestamp );
 799                         if( $previousRev ) {
 800                                 $this->showDiff( $previousRev, $rev );
 801                                 if( $this->mDiffOnly ) {
 802                                         return;
 803                                 } else {
 804                                         $out->addHTML( '<hr />' );
 805                                 }
 806                         } else {
 807                                 $out->addWikiMsg( 'undelete-nodiff' );
 808                         }
 809                 }
 810
 811                 $link = Linker::linkKnown(
 812                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 813                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 814                 );
 815
 816                 $lang = $this->getLanguage();
 817
 818                 // date and time are separate parameters to facilitate localisation.
 819                 // $time is kept for backward compat reasons.
 820                 $time = $lang->userTimeAndDate( $timestamp, $user );
 821                 $d = $lang->userDate( $timestamp, $user );
 822                 $t = $lang->userTime( $timestamp, $user );
 823                 $userLink = Linker::revUserTools( $rev );
 824
 825                 if( $this->mPreview ) {
 826                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 827                 } else {
 828                         $openDiv = '<div id="mw-undelete-revision">';
 829                 }
 830                 $out->addHTML( $openDiv );
 831
 832                 // Revision delete links
 833                 if ( !$this->mDiff ) {
 834                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 835                         if ( $revdel ) {
 836                                 $out->addHTML( "$revdel " );
 837                         }
 838                 }
 839
 840                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 841                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 842                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 843
 844                 if( $this->mPreview ) {
 845                         // Hide [edit]s
 846                         $popts = $out->parserOptions();
 847                         $popts->setEditSection( false );
 848                         $out->parserOptions( $popts );
 849                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER, $user ), $this->mTargetObj, true );
 850                 }
 851
 852                 $out->addHTML(
 853                         Xml::element( 'textarea', array(
 854                                         'readonly' => 'readonly',
 855                                         'cols' => intval( $user->getOption( 'cols' ) ),
 856                                         'rows' => intval( $user->getOption( 'rows' ) ) ),
 857                                 $rev->getText( Revision::FOR_THIS_USER, $user ) . "\n" ) .
 858                         Xml::openElement( 'div' ) .
 859                         Xml::openElement( 'form', array(
 860                                 'method' => 'post',
 861                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 862                         Xml::element( 'input', array(
 863                                 'type' => 'hidden',
 864                                 'name' => 'target',
 865                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 866                         Xml::element( 'input', array(
 867                                 'type' => 'hidden',
 868                                 'name' => 'timestamp',
 869                                 'value' => $timestamp ) ) .
 870                         Xml::element( 'input', array(
 871                                 'type' => 'hidden',
 872                                 'name' => 'wpEditToken',
 873                                 'value' => $user->getEditToken() ) ) .
 874                         Xml::element( 'input', array(
 875                                 'type' => 'submit',
 876                                 'name' => 'preview',
 877                                 'value' => $this->msg( 'showpreview' )->text() ) ) .
 878                         Xml::element( 'input', array(
 879                                 'name' => 'diff',
 880                                 'type' => 'submit',
 881                                 'value' => $this->msg( 'showdiff' )->text() ) ) .
 882                         Xml::closeElement( 'form' ) .
 883                         Xml::closeElement( 'div' ) );
 884         }
 885
 886         /**
 887          * Build a diff display between this and the previous either deleted
 888          * or non-deleted edit.
 889          *
 890          * @param $previousRev Revision
 891          * @param $currentRev Revision
 892          * @return String: HTML
 893          */
 894         function showDiff( $previousRev, $currentRev ) {
 895                 $diffEngine = new DifferenceEngine( $this->getContext() );
 896                 $diffEngine->showDiffStyle();
 897                 $this->getOutput()->addHTML(
 898                         "<div>" .
 899                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 900                         "<col class='diff-marker' />" .
 901                         "<col class='diff-content' />" .
 902                         "<col class='diff-marker' />" .
 903                         "<col class='diff-content' />" .
 904                         "<tr>" .
 905                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 906                                 $this->diffHeader( $previousRev, 'o' ) .
 907                                 "</td>\n" .
 908                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 909                                 $this->diffHeader( $currentRev, 'n' ) .
 910                                 "</td>\n" .
 911                         "</tr>" .
 912                         $diffEngine->generateDiffBody(
 913                                 $previousRev->getText(), $currentRev->getText() ) .
 914                         "</table>" .
 915                         "</div>\n"
 916                 );
 917         }
 918
 919         /**
 920          * @param $rev Revision
 921          * @param $prefix
 922          * @return string
 923          */
 924         private function diffHeader( $rev, $prefix ) {
 925                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 926                 if( $isDeleted ) {
 927                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 928                         $targetPage = $this->getTitle();
 929                         $targetQuery = array(
 930                                 'target' => $this->mTargetObj->getPrefixedText(),
 931                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 932                         );
 933                 } else {
 934                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 935                         $targetPage = $rev->getTitle();
 936                         $targetQuery = array( 'oldid' => $rev->getId() );
 937                 }
 938                 // Add show/hide deletion links if available
 939                 $user = $this->getUser();
 940                 $lang = $this->getLanguage();
 941                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 942                 if ( $rdel ) $rdel = " $rdel";
 943                 return
 944                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 945                                 Linker::link(
 946                                         $targetPage,
 947                                         $this->msg(
 948                                                 'revisionasof',
 949                                                 $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
 950                                                 $lang->userDate( $rev->getTimestamp(), $user ),
 951                                                 $lang->userTime( $rev->getTimestamp(), $user )
 952                                         )->escaped(),
 953                                         array(),
 954                                         $targetQuery
 955                                 ) .
 956                         '</strong></div>' .
 957                         '<div id="mw-diff-'.$prefix.'title2">' .
 958                                 Linker::revUserTools( $rev ) . '<br />' .
 959                         '</div>' .
 960                         '<div id="mw-diff-'.$prefix.'title3">' .
 961                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 962                         '</div>';
 963         }
 964
 965         /**
 966          * Show a form confirming whether a tokenless user really wants to see a file
 967          */
 968         private function showFileConfirmationForm( $key ) {
 969                 $out = $this->getOutput();
 970                 $lang = $this->getLanguage();
 971                 $user = $this->getUser();
 972                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 973                 $out->addWikiMsg( 'undelete-show-file-confirm',
 974                         $this->mTargetObj->getText(),
 975                         $lang->userDate( $file->getTimestamp(), $user ),
 976                         $lang->userTime( $file->getTimestamp(), $user ) );
 977                 $out->addHTML(
 978                         Xml::openElement( 'form', array(
 979                                 'method' => 'POST',
 980                                 'action' => $this->getTitle()->getLocalURL(
 981                                         'target=' . urlencode( $this->mTarget ) .
 982                                         '&file=' . urlencode( $key ) .
 983                                         '&token=' . urlencode( $user->getEditToken( $key ) ) )
 984                                 )
 985                         ) .
 986                         Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
 987                         '</form>'
 988                 );
 989         }
 990
 991         /**
 992          * Show a deleted file version requested by the visitor.
 993          */
 994         private function showFile( $key ) {
 995                 $this->getOutput()->disable();
 996
 997                 # We mustn't allow the output to be Squid cached, otherwise
 998                 # if an admin previews a deleted image, and it's cached, then
 999                 # a user without appropriate permissions can toddle off and
1000                 # nab the image, and Squid will serve it
1001                 $response = $this->getRequest()->response();
1002                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1003                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1004                 $response->header( 'Pragma: no-cache' );
1005
1006                 $repo = RepoGroup::singleton()->getLocalRepo();
1007                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1008                 $repo->streamFile( $path );
1009         }
1010
1011         private function showHistory() {
1012                 $out = $this->getOutput();
1013                 if( $this->mAllowed ) {
1014                         $out->addModules( 'mediawiki.special.undelete' );
1015                 }
1016                 $out->wrapWikiMsg(
1017                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1018                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1019                 );
1020
1021                 $archive = new PageArchive( $this->mTargetObj );
1022                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1023                 /*
1024                 $text = $archive->getLastRevisionText();
1025                 if( is_null( $text ) ) {
1026                         $out->addWikiMsg( 'nohistory' );
1027                         return;
1028                 }
1029                 */
1030                 $out->addHTML( '<div class="mw-undelete-history">' );
1031                 if ( $this->mAllowed ) {
1032                         $out->addWikiMsg( 'undeletehistory' );
1033                         $out->addWikiMsg( 'undeleterevdel' );
1034                 } else {
1035                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1036                 }
1037                 $out->addHTML( '</div>' );
1038
1039                 # List all stored revisions
1040                 $revisions = $archive->listRevisions();
1041                 $files = $archive->listFiles();
1042
1043                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1044                 $haveFiles = $files && $files->numRows() > 0;
1045
1046                 # Batch existence check on user and talk pages
1047                 if( $haveRevisions ) {
1048                         $batch = new LinkBatch();
1049                         foreach ( $revisions as $row ) {
1050                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1051                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1052                         }
1053                         $batch->execute();
1054                         $revisions->seek( 0 );
1055                 }
1056                 if( $haveFiles ) {
1057                         $batch = new LinkBatch();
1058                         foreach ( $files as $row ) {
1059                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1060                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1061                         }
1062                         $batch->execute();
1063                         $files->seek( 0 );
1064                 }
1065
1066                 if ( $this->mAllowed ) {
1067                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1068                         # Start the form here
1069                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1070                         $out->addHTML( $top );
1071                 }
1072
1073                 # Show relevant lines from the deletion log:
1074                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1075                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1076                 # Show relevant lines from the suppression log:
1077                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1078                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1079                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1080                 }
1081
1082                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1083                         # Format the user-visible controls (comment field, submission button)
1084                         # in a nice little table
1085                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1086                                 $unsuppressBox =
1087                                         "<tr>
1088                                                 <td>&#160;</td>
1089                                                 <td class='mw-input'>" .
1090                                                         Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1091                                                                 'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ).
1092                                                 "</td>
1093                                         </tr>";
1094                         } else {
1095                                 $unsuppressBox = '';
1096                         }
1097                         $table =
1098                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1099                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1100                                         "<tr>
1101                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1102                                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1103                                                 "</td>
1104                                         </tr>
1105                                         <tr>
1106                                                 <td class='mw-label'>" .
1107                                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1108                                                 "</td>
1109                                                 <td class='mw-input'>" .
1110                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1111                                                 "</td>
1112                                         </tr>
1113                                         <tr>
1114                                                 <td>&#160;</td>
1115                                                 <td class='mw-submit'>" .
1116                                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1117                                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1118                                                 "</td>
1119                                         </tr>" .
1120                                         $unsuppressBox .
1121                                 Xml::closeElement( 'table' ) .
1122                                 Xml::closeElement( 'fieldset' );
1123
1124                         $out->addHTML( $table );
1125                 }
1126
1127                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1128
1129                 if( $haveRevisions ) {
1130                         # The page's stored (deleted) history:
1131                         $out->addHTML( '<ul>' );
1132                         $remaining = $revisions->numRows();
1133                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1134
1135                         foreach ( $revisions as $row ) {
1136                                 $remaining--;
1137                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1138                         }
1139                         $revisions->free();
1140                         $out->addHTML( '</ul>' );
1141                 } else {
1142                         $out->addWikiMsg( 'nohistory' );
1143                 }
1144
1145                 if( $haveFiles ) {
1146                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1147                         $out->addHTML( '<ul>' );
1148                         foreach ( $files as $row ) {
1149                                 $out->addHTML( $this->formatFileRow( $row ) );
1150                         }
1151                         $files->free();
1152                         $out->addHTML( '</ul>' );
1153                 }
1154
1155                 if ( $this->mAllowed ) {
1156                         # Slip in the hidden controls here
1157                         $misc  = Html::hidden( 'target', $this->mTarget );
1158                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1159                         $misc .= Xml::closeElement( 'form' );
1160                         $out->addHTML( $misc );
1161                 }
1162
1163                 return true;
1164         }
1165
1166         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1167                 $rev = Revision::newFromArchiveRow( $row,
1168                         array( 'page' => $this->mTargetObj->getArticleID() ) );
1169                 $stxt = '';
1170                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1171                 // Build checkboxen...
1172                 if( $this->mAllowed ) {
1173                         if( $this->mInvert ) {
1174                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1175                                         $checkBox = Xml::check( "ts$ts" );
1176                                 } else {
1177                                         $checkBox = Xml::check( "ts$ts", true );
1178                                 }
1179                         } else {
1180                                 $checkBox = Xml::check( "ts$ts" );
1181                         }
1182                 } else {
1183                         $checkBox = '';
1184                 }
1185                 $user = $this->getUser();
1186                 // Build page & diff links...
1187                 if( $this->mCanView ) {
1188                         $titleObj = $this->getTitle();
1189                         # Last link
1190                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1191                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1192                                 $last = $this->msg( 'diff' )->escaped();
1193                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1194                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1195                                 $last = Linker::linkKnown(
1196                                         $titleObj,
1197                                         $this->msg( 'diff' )->escaped(),
1198                                         array(),
1199                                         array(
1200                                                 'target' => $this->mTargetObj->getPrefixedText(),
1201                                                 'timestamp' => $ts,
1202                                                 'diff' => 'prev'
1203                                         )
1204                                 );
1205                         } else {
1206                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1207                                 $last = $this->msg( 'diff' )->escaped();
1208                         }
1209                 } else {
1210                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1211                         $last = $this->msg( 'diff' )->escaped();
1212                 }
1213                 // User links
1214                 $userLink = Linker::revUserTools( $rev );
1215                 // Revision text size
1216                 $size = $row->ar_len;
1217                 if( !is_null( $size ) ) {
1218                         $stxt = Linker::formatRevisionSize( $size );
1219                 }
1220                 // Edit summary
1221                 $comment = Linker::revComment( $rev );
1222                 // Revision delete links
1223                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1224                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1225         }
1226
1227         private function formatFileRow( $row ) {
1228                 $file = ArchivedFile::newFromRow( $row );
1229
1230                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1231                 $user = $this->getUser();
1232                 if( $this->mAllowed && $row->fa_storage_key ) {
1233                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1234                         $key = urlencode( $row->fa_storage_key );
1235                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1236                 } else {
1237                         $checkBox = '';
1238                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1239                 }
1240                 $userLink = $this->getFileUser( $file );
1241                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1242                 $bytes = $this->msg( 'parentheses' )->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )->plain();
1243                 $data = htmlspecialchars( $data . ' ' . $bytes );
1244                 $comment = $this->getFileComment( $file );
1245
1246                 // Add show/hide deletion links if available
1247                 $canHide = $user->isAllowed( 'deleterevision' );
1248                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1249                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1250                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1251                         } else {
1252                                 $query = array(
1253                                         'type' => 'filearchive',
1254                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1255                                         'ids' => $row->fa_id
1256                                 );
1257                                 $revdlink = Linker::revDeleteLink( $query,
1258                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1259                         }
1260                 } else {
1261                         $revdlink = '';
1262                 }
1263
1264                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1265         }
1266
1267         /**
1268          * Fetch revision text link if it's available to all users
1269          *
1270          * @param $rev Revision
1271          * @param $titleObj Title
1272          * @param $ts string Timestamp
1273          * @return string
1274          */
1275         function getPageLink( $rev, $titleObj, $ts ) {
1276                 $user = $this->getUser();
1277                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1278
1279                 if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1280                         return '<span class="history-deleted">' . $time . '</span>';
1281                 } else {
1282                         $link = Linker::linkKnown(
1283                                 $titleObj,
1284                                 htmlspecialchars( $time ),
1285                                 array(),
1286                                 array(
1287                                         'target' => $this->mTargetObj->getPrefixedText(),
1288                                         'timestamp' => $ts
1289                                 )
1290                         );
1291                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1292                                 $link = '<span class="history-deleted">' . $link . '</span>';
1293                         }
1294                         return $link;
1295                 }
1296         }
1297
1298         /**
1299          * Fetch image view link if it's available to all users
1300          *
1301          * @param $file File
1302          * @param $titleObj Title
1303          * @param $ts string A timestamp
1304          * @param $key String: a storage key
1305          *
1306          * @return String: HTML fragment
1307          */
1308         function getFileLink( $file, $titleObj, $ts, $key ) {
1309                 $user = $this->getUser();
1310                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1311
1312                 if( !$file->userCan( File::DELETED_FILE, $user ) ) {
1313                         return '<span class="history-deleted">' . $time . '</span>';
1314                 } else {
1315                         $link = Linker::linkKnown(
1316                                 $titleObj,
1317                                 htmlspecialchars( $time ),
1318                                 array(),
1319                                 array(
1320                                         'target' => $this->mTargetObj->getPrefixedText(),
1321                                         'file' => $key,
1322                                         'token' => $user->getEditToken( $key )
1323                                 )
1324                         );
1325                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1326                                 $link = '<span class="history-deleted">' . $link . '</span>';
1327                         }
1328                         return $link;
1329                 }
1330         }
1331
1332         /**
1333          * Fetch file's user id if it's available to this user
1334          *
1335          * @param $file File
1336          * @return String: HTML fragment
1337          */
1338         function getFileUser( $file ) {
1339                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1340                         return '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1341                 } else {
1342                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1343                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1344                         if( $file->isDeleted( File::DELETED_USER ) ) {
1345                                 $link = '<span class="history-deleted">' . $link . '</span>';
1346                         }
1347                         return $link;
1348                 }
1349         }
1350
1351         /**
1352          * Fetch file upload comment if it's available to this user
1353          *
1354          * @param $file File
1355          * @return String: HTML fragment
1356          */
1357         function getFileComment( $file ) {
1358                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1359                         return '<span class="history-deleted"><span class="comment">' .
1360                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1361                 } else {
1362                         $link = Linker::commentBlock( $file->getRawDescription() );
1363                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1364                                 $link = '<span class="history-deleted">' . $link . '</span>';
1365                         }
1366                         return $link;
1367                 }
1368         }
1369
1370         function undelete() {
1371                 global $wgUploadMaintenance;
1372
1373                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1374                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1375                 }
1376
1377                 if ( wfReadOnly() ) {
1378                         throw new ReadOnlyError;
1379                 }
1380
1381                 $out = $this->getOutput();
1382                 $archive = new PageArchive( $this->mTargetObj );
1383                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1384                 $ok = $archive->undelete(
1385                         $this->mTargetTimestamp,
1386                         $this->mComment,
1387                         $this->mFileVersions,
1388                         $this->mUnsuppress );
1389
1390                 if( is_array( $ok ) ) {
1391                         if ( $ok[1] ) { // Undeleted file count
1392                                 wfRunHooks( 'FileUndeleteComplete', array(
1393                                         $this->mTargetObj, $this->mFileVersions,
1394                                         $this->getUser(), $this->mComment ) );
1395                         }
1396
1397                         $link = Linker::linkKnown( $this->mTargetObj );
1398                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1399                 } else {
1400                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1401                         $out->addWikiMsg( 'cannotundelete' );
1402                         $out->addWikiMsg( 'undeleterevdel' );
1403                 }
1404
1405                 // Show file deletion warnings and errors
1406                 $status = $archive->getFileStatus();
1407                 if( $status && !$status->isGood() ) {
1408                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1409                 }
1410         }
1411 }