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' => 'ar_namespace,ar_title',
 101                                         'ORDER BY' => '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'
 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                         array( 'ar_namespace' => $this->title->getNamespace(),
 192                                    'ar_title' => $this->title->getDBkey(),
 193                                    'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 194                         __METHOD__ );
 195                 if( $row ) {
 196                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 197                 } else {
 198                         return null;
 199                 }
 200         }
 201
 202         /**
 203          * Return the most-previous revision, either live or deleted, against
 204          * the deleted revision given by timestamp.
 205          *
 206          * May produce unexpected results in case of history merges or other
 207          * unusual time issues.
 208          *
 209          * @param $timestamp String
 210          * @return Revision or null
 211          */
 212         function getPreviousRevision( $timestamp ) {
 213                 $dbr = wfGetDB( DB_SLAVE );
 214
 215                 // Check the previous deleted revision...
 216                 $row = $dbr->selectRow( 'archive',
 217                         'ar_timestamp',
 218                         array( 'ar_namespace' => $this->title->getNamespace(),
 219                                    'ar_title' => $this->title->getDBkey(),
 220                                    'ar_timestamp < ' .
 221                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 222                         __METHOD__,
 223                         array(
 224                                 'ORDER BY' => 'ar_timestamp DESC',
 225                                 'LIMIT' => 1 ) );
 226                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 227
 228                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 229                         array( 'rev_id', 'rev_timestamp' ),
 230                         array(
 231                                 'page_namespace' => $this->title->getNamespace(),
 232                                 'page_title' => $this->title->getDBkey(),
 233                                 'page_id = rev_page',
 234                                 'rev_timestamp < ' .
 235                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 236                         __METHOD__,
 237                         array(
 238                                 'ORDER BY' => 'rev_timestamp DESC',
 239                                 'LIMIT' => 1 ) );
 240                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 241                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 242
 243                 if( $prevLive && $prevLive > $prevDeleted ) {
 244                         // Most prior revision was live
 245                         return Revision::newFromId( $prevLiveId );
 246                 } elseif( $prevDeleted ) {
 247                         // Most prior revision was deleted
 248                         return $this->getRevision( $prevDeleted );
 249                 } else {
 250                         // No prior revision on this page.
 251                         return null;
 252                 }
 253         }
 254
 255         /**
 256          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 257          *
 258          * @param $row Object: database row
 259          * @return Revision
 260          */
 261         function getTextFromRow( $row ) {
 262                 if( is_null( $row->ar_text_id ) ) {
 263                         // An old row from MediaWiki 1.4 or previous.
 264                         // Text is embedded in this row in classic compression format.
 265                         return Revision::getRevisionText( $row, 'ar_' );
 266                 } else {
 267                         // New-style: keyed to the text storage backend.
 268                         $dbr = wfGetDB( DB_SLAVE );
 269                         $text = $dbr->selectRow( 'text',
 270                                 array( 'old_text', 'old_flags' ),
 271                                 array( 'old_id' => $row->ar_text_id ),
 272                                 __METHOD__ );
 273                         return Revision::getRevisionText( $text );
 274                 }
 275         }
 276
 277         /**
 278          * Fetch (and decompress if necessary) the stored text of the most
 279          * recently edited deleted revision of the page.
 280          *
 281          * If there are no archived revisions for the page, returns NULL.
 282          *
 283          * @return String
 284          */
 285         function getLastRevisionText() {
 286                 $dbr = wfGetDB( DB_SLAVE );
 287                 $row = $dbr->selectRow( 'archive',
 288                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 289                         array( 'ar_namespace' => $this->title->getNamespace(),
 290                                    'ar_title' => $this->title->getDBkey() ),
 291                         __METHOD__,
 292                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 293                 if( $row ) {
 294                         return $this->getTextFromRow( $row );
 295                 } else {
 296                         return null;
 297                 }
 298         }
 299
 300         /**
 301          * Quick check if any archived revisions are present for the page.
 302          *
 303          * @return Boolean
 304          */
 305         function isDeleted() {
 306                 $dbr = wfGetDB( DB_SLAVE );
 307                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 308                         array( 'ar_namespace' => $this->title->getNamespace(),
 309                                    'ar_title' => $this->title->getDBkey() ) );
 310                 return ( $n > 0 );
 311         }
 312
 313         /**
 314          * Restore the given (or all) text and file revisions for the page.
 315          * Once restored, the items will be removed from the archive tables.
 316          * The deletion log will be updated with an undeletion notice.
 317          *
 318          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 319          * @param $comment String
 320          * @param $fileVersions Array
 321          * @param $unsuppress Boolean
 322          *
 323          * @return array(number of file revisions restored, number of image revisions restored, log message)
 324          * on success, false on failure
 325          */
 326         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 327                 // If both the set of text revisions and file revisions are empty,
 328                 // restore everything. Otherwise, just restore the requested items.
 329                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 330
 331                 $restoreText = $restoreAll || !empty( $timestamps );
 332                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 333
 334                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 335                         $img = wfLocalFile( $this->title );
 336                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 337                         if ( !$this->fileStatus->isOk() ) {
 338                                 return false;
 339                         }
 340                         $filesRestored = $this->fileStatus->successCount;
 341                 } else {
 342                         $filesRestored = 0;
 343                 }
 344
 345                 if( $restoreText ) {
 346                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 347                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 348                                 return false;
 349                         }
 350                 } else {
 351                         $textRestored = 0;
 352                 }
 353
 354                 // Touch the log!
 355                 global $wgContLang;
 356                 $log = new LogPage( 'delete' );
 357
 358                 if( $textRestored && $filesRestored ) {
 359                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 360                                 $wgContLang->formatNum( $textRestored ),
 361                                 $wgContLang->formatNum( $filesRestored ) );
 362                 } elseif( $textRestored ) {
 363                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 364                                 $wgContLang->formatNum( $textRestored ) );
 365                 } elseif( $filesRestored ) {
 366                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 367                                 $wgContLang->formatNum( $filesRestored ) );
 368                 } else {
 369                         wfDebug( "Undelete: nothing undeleted...\n" );
 370                         return false;
 371                 }
 372
 373                 if( trim( $comment ) != '' ) {
 374                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 375                 }
 376                 $log->addEntry( 'restore', $this->title, $reason );
 377
 378                 return array( $textRestored, $filesRestored, $reason );
 379         }
 380
 381         /**
 382          * This is the meaty bit -- restores archived revisions of the given page
 383          * to the cur/old tables. If the page currently exists, all revisions will
 384          * be stuffed into old, otherwise the most recent will go into cur.
 385          *
 386          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 387          * @param $comment String
 388          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 389          *
 390          * @return Mixed: number of revisions restored or false on failure
 391          */
 392         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 393                 if ( wfReadOnly() ) {
 394                         return false;
 395                 }
 396                 $restoreAll = empty( $timestamps );
 397
 398                 $dbw = wfGetDB( DB_MASTER );
 399
 400                 # Does this page already exist? We'll have to update it...
 401                 $article = new Article( $this->title );
 402                 $options = 'FOR UPDATE'; // lock page
 403                 $page = $dbw->selectRow( 'page',
 404                         array( 'page_id', 'page_latest' ),
 405                         array( 'page_namespace' => $this->title->getNamespace(),
 406                                    'page_title'     => $this->title->getDBkey() ),
 407                         __METHOD__,
 408                         $options
 409                 );
 410                 if( $page ) {
 411                         $makepage = false;
 412                         # Page already exists. Import the history, and if necessary
 413                         # we'll update the latest revision field in the record.
 414                         $newid             = 0;
 415                         $pageId            = $page->page_id;
 416                         $previousRevId    = $page->page_latest;
 417                         # Get the time span of this page
 418                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 419                                 array( 'rev_id' => $previousRevId ),
 420                                 __METHOD__ );
 421                         if( $previousTimestamp === false ) {
 422                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 423                                 return 0;
 424                         }
 425                 } else {
 426                         # Have to create a new article...
 427                         $makepage = true;
 428                         $previousRevId = 0;
 429                         $previousTimestamp = 0;
 430                 }
 431
 432                 if( $restoreAll ) {
 433                         $oldones = '1 = 1'; # All revisions...
 434                 } else {
 435                         $oldts = implode( ',',
 436                                 array_map( array( &$dbw, 'addQuotes' ),
 437                                         array_map( array( &$dbw, 'timestamp' ),
 438                                                 $timestamps ) ) );
 439
 440                         $oldones = "ar_timestamp IN ( {$oldts} )";
 441                 }
 442
 443                 /**
 444                  * Select each archived revision...
 445                  */
 446                 $result = $dbw->select( 'archive',
 447                         /* fields */ array(
 448                                 'ar_rev_id',
 449                                 'ar_text',
 450                                 'ar_comment',
 451                                 'ar_user',
 452                                 'ar_user_text',
 453                                 'ar_timestamp',
 454                                 'ar_minor_edit',
 455                                 'ar_flags',
 456                                 'ar_text_id',
 457                                 'ar_deleted',
 458                                 'ar_page_id',
 459                                 'ar_len' ),
 460                         /* WHERE */ array(
 461                                 'ar_namespace' => $this->title->getNamespace(),
 462                                 'ar_title'     => $this->title->getDBkey(),
 463                                 $oldones ),
 464                         __METHOD__,
 465                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 466                 );
 467                 $ret = $dbw->resultObject( $result );
 468                 $rev_count = $dbw->numRows( $result );
 469                 if( !$rev_count ) {
 470                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 471                         return false; // ???
 472                 }
 473
 474                 $ret->seek( $rev_count - 1 ); // move to last
 475                 $row = $ret->fetchObject(); // get newest archived rev
 476                 $ret->seek( 0 ); // move back
 477
 478                 if( $makepage ) {
 479                         // Check the state of the newest to-be version...
 480                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 481                                 return false; // we can't leave the current revision like this!
 482                         }
 483                         // Safe to insert now...
 484                         $newid  = $article->insertOn( $dbw );
 485                         $pageId = $newid;
 486                 } else {
 487                         // Check if a deleted revision will become the current revision...
 488                         if( $row->ar_timestamp > $previousTimestamp ) {
 489                                 // Check the state of the newest to-be version...
 490                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 491                                         return false; // we can't leave the current revision like this!
 492                                 }
 493                         }
 494                 }
 495
 496                 $revision = null;
 497                 $restored = 0;
 498
 499                 foreach ( $ret as $row ) {
 500                         // Check for key dupes due to shitty archive integrity.
 501                         if( $row->ar_rev_id ) {
 502                                 $exists = $dbw->selectField( 'revision', '1',
 503                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 504                                 if( $exists ) {
 505                                         continue; // don't throw DB errors
 506                                 }
 507                         }
 508                         // Insert one revision at a time...maintaining deletion status
 509                         // unless we are specifically removing all restrictions...
 510                         $revision = Revision::newFromArchiveRow( $row,
 511                                 array(
 512                                         'page' => $pageId,
 513                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 514                                 ) );
 515
 516                         $revision->insertOn( $dbw );
 517                         $restored++;
 518
 519                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 520                 }
 521                 # Now that it's safely stored, take it out of the archive
 522                 $dbw->delete( 'archive',
 523                         /* WHERE */ array(
 524                                 'ar_namespace' => $this->title->getNamespace(),
 525                                 'ar_title' => $this->title->getDBkey(),
 526                                 $oldones ),
 527                         __METHOD__ );
 528
 529                 // Was anything restored at all?
 530                 if ( $restored == 0 ) {
 531                         return 0;
 532                 }
 533
 534                 $created = (bool)$newid;
 535                 $oldcountable = $article->isCountable();
 536
 537                 // Attach the latest revision to the page...
 538                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 539                 if ( $created || $wasnew ) {
 540                         // Update site stats, link tables, etc
 541                         $user = User::newFromName( $revision->getRawUserText(), false );
 542                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 543                 }
 544
 545                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 546
 547                 if( $this->title->getNamespace() == NS_FILE ) {
 548                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 549                         $update->doUpdate();
 550                 }
 551
 552                 return $restored;
 553         }
 554
 555         /**
 556          * @return Status
 557          */
 558         function getFileStatus() { return $this->fileStatus; }
 559 }
 560
 561 /**
 562  * Special page allowing users with the appropriate permissions to view
 563  * and restore deleted content.
 564  *
 565  * @ingroup SpecialPage
 566  */
 567 class SpecialUndelete extends SpecialPage {
 568         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 569         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 570
 571         /**
 572          * @var Title
 573          */
 574         var $mTargetObj;
 575
 576         function __construct( $request = null ) {
 577                 parent::__construct( 'Undelete', 'deletedhistory' );
 578
 579                 if ( $request === null ) {
 580                         global $wgRequest;
 581                         $this->mRequest = $wgRequest;
 582                 } else {
 583                         $this->mRequest = $request;
 584                 }
 585         }
 586
 587         function loadRequest() {
 588                 global $wgUser;
 589                 $this->mAction = $this->mRequest->getVal( 'action' );
 590                 $this->mTarget = $this->mRequest->getVal( 'target' );
 591                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 592                 $time = $this->mRequest->getVal( 'timestamp' );
 593                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 594                 $this->mFilename = $this->mRequest->getVal( 'file' );
 595
 596                 $posted = $this->mRequest->wasPosted() &&
 597                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 598                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 599                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 600                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 601                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 602                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 603                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 604                 $this->mToken = $this->mRequest->getVal( 'token' );
 605
 606                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 607                         $this->mAllowed = true; // user can restore
 608                         $this->mCanView = true; // user can view content
 609                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 610                         $this->mAllowed = false; // user cannot restore
 611                         $this->mCanView = true; // user can view content
 612                 } else { // user can only view the list of revisions
 613                         $this->mAllowed = false;
 614                         $this->mCanView = false;
 615                         $this->mTimestamp = '';
 616                         $this->mRestore = false;
 617                 }
 618
 619                 if( $this->mRestore || $this->mInvert ) {
 620                         $timestamps = array();
 621                         $this->mFileVersions = array();
 622                         foreach( $_REQUEST as $key => $val ) {
 623                                 $matches = array();
 624                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 625                                         array_push( $timestamps, $matches[1] );
 626                                 }
 627
 628                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 629                                         $this->mFileVersions[] = intval( $matches[1] );
 630                                 }
 631                         }
 632                         rsort( $timestamps );
 633                         $this->mTargetTimestamp = $timestamps;
 634                 }
 635         }
 636
 637         function execute( $par ) {
 638                 global $wgOut, $wgUser;
 639
 640                 $this->setHeaders();
 641                 if ( !$this->userCanExecute( $wgUser ) ) {
 642                         $this->displayRestrictionError();
 643                         return;
 644                 }
 645                 $this->outputHeader();
 646
 647                 $this->loadRequest();
 648
 649                 if ( $this->mAllowed ) {
 650                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 651                 } else {
 652                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
 653                 }
 654
 655                 if( $par != '' ) {
 656                         $this->mTarget = $par;
 657                 }
 658                 if ( $this->mTarget !== '' ) {
 659                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 660                         $wgUser->getSkin()->setRelevantTitle( $this->mTargetObj );
 661                 } else {
 662                         $this->mTargetObj = null;
 663                 }
 664
 665                 if( is_null( $this->mTargetObj ) ) {
 666                         # Not all users can just browse every deleted page from the list
 667                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 668                                 $this->showSearchForm();
 669
 670                                 # List undeletable articles
 671                                 if( $this->mSearchPrefix ) {
 672                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 673                                         $this->showList( $result );
 674                                 }
 675                         } else {
 676                                 $wgOut->addWikiMsg( 'undelete-header' );
 677                         }
 678                         return;
 679                 }
 680                 if( $this->mTimestamp !== '' ) {
 681                         return $this->showRevision( $this->mTimestamp );
 682                 }
 683                 if( $this->mFilename !== null ) {
 684                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 685                         // Check if user is allowed to see this file
 686                         if ( !$file->exists() ) {
 687                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 688                                 return;
 689                         } elseif( !$file->userCan( File::DELETED_FILE ) ) {
 690                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 691                                         $wgOut->permissionRequired( 'suppressrevision' );
 692                                 } else {
 693                                         $wgOut->permissionRequired( 'deletedtext' );
 694                                 }
 695                                 return false;
 696                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFilename ) ) {
 697                                 $this->showFileConfirmationForm( $this->mFilename );
 698                                 return false;
 699                         } else {
 700                                 return $this->showFile( $this->mFilename );
 701                         }
 702                 }
 703                 if( $this->mRestore && $this->mAction == 'submit' ) {
 704                         global $wgUploadMaintenance;
 705                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 706                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 707                                 return;
 708                         }
 709                         return $this->undelete();
 710                 }
 711                 if( $this->mInvert && $this->mAction == 'submit' ) {
 712                         return $this->showHistory();
 713                 }
 714                 return $this->showHistory();
 715         }
 716
 717         function showSearchForm() {
 718                 global $wgOut, $wgScript;
 719                 $wgOut->addWikiMsg( 'undelete-header' );
 720
 721                 $wgOut->addHTML(
 722                         Xml::openElement( 'form', array(
 723                                 'method' => 'get',
 724                                 'action' => $wgScript ) ) .
 725                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 726                         Html::hidden( 'title',
 727                                 $this->getTitle()->getPrefixedDbKey() ) .
 728                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 729                                 'prefix', 'prefix', 20,
 730                                 $this->mSearchPrefix ) . ' ' .
 731                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 732                         Xml::closeElement( 'fieldset' ) .
 733                         Xml::closeElement( 'form' )
 734                 );
 735         }
 736
 737         /**
 738          * Generic list of deleted pages
 739          *
 740          * @param $result ResultWrapper
 741          * @return bool
 742          */
 743         private function showList( $result ) {
 744                 global $wgLang, $wgUser, $wgOut;
 745
 746                 if( $result->numRows() == 0 ) {
 747                         $wgOut->addWikiMsg( 'undelete-no-results' );
 748                         return;
 749                 }
 750
 751                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 752
 753                 $sk = $wgUser->getSkin();
 754                 $undelete = $this->getTitle();
 755                 $wgOut->addHTML( "<ul>\n" );
 756                 foreach ( $result as $row ) {
 757                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 758                         $link = $sk->linkKnown(
 759                                 $undelete,
 760                                 htmlspecialchars( $title->getPrefixedText() ),
 761                                 array(),
 762                                 array( 'target' => $title->getPrefixedText() )
 763                         );
 764                         $revs = wfMsgExt( 'undeleterevisions',
 765                                 array( 'parseinline' ),
 766                                 $wgLang->formatNum( $row->count ) );
 767                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 768                 }
 769                 $result->free();
 770                 $wgOut->addHTML( "</ul>\n" );
 771
 772                 return true;
 773         }
 774
 775         private function showRevision( $timestamp ) {
 776                 global $wgLang, $wgUser, $wgOut;
 777
 778                 $skin = $wgUser->getSkin();
 779
 780                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 781                         return 0;
 782                 }
 783
 784                 $archive = new PageArchive( $this->mTargetObj );
 785                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 786                 $rev = $archive->getRevision( $timestamp );
 787
 788                 if( !$rev ) {
 789                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 790                         return;
 791                 }
 792
 793                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 794                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 795                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 796                                 return;
 797                         } else {
 798                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 799                                 $wgOut->addHTML( '<br />' );
 800                                 // and we are allowed to see...
 801                         }
 802                 }
 803
 804                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 805
 806                 $link = $skin->linkKnown(
 807                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 808                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 809                 );
 810
 811                 if( $this->mDiff ) {
 812                         $previousRev = $archive->getPreviousRevision( $timestamp );
 813                         if( $previousRev ) {
 814                                 $this->showDiff( $previousRev, $rev );
 815                                 if( $wgUser->getOption( 'diffonly' ) ) {
 816                                         return;
 817                                 } else {
 818                                         $wgOut->addHTML( '<hr />' );
 819                                 }
 820                         } else {
 821                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 822                         }
 823                 }
 824
 825                 // date and time are separate parameters to facilitate localisation.
 826                 // $time is kept for backward compat reasons.
 827                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 828                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 829                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 830                 $user = $skin->revUserTools( $rev );
 831
 832                 if( $this->mPreview ) {
 833                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 834                 } else {
 835                         $openDiv = '<div id="mw-undelete-revision">';
 836                 }
 837                 $wgOut->addHTML( $openDiv );
 838
 839                 // Revision delete links
 840                 if ( !$this->mDiff ) {
 841                         $revdel = $this->revDeleteLink( $rev );
 842                         if ( $revdel ) {
 843                                 $wgOut->addHTML( $revdel );
 844                         }
 845                 }
 846
 847                 $wgOut->addWikiMsgArray( 'undelete-revision', array( $link, $time, $user, $d, $t ), array( 'replaceafter' ) );
 848                 $wgOut->addHTML( '</div>' );
 849                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 850
 851                 if( $this->mPreview ) {
 852                         // Hide [edit]s
 853                         $popts = $wgOut->parserOptions();
 854                         $popts->setEditSection( false );
 855                         $wgOut->parserOptions( $popts );
 856                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 857                 }
 858
 859                 $wgOut->addHTML(
 860                         Xml::element( 'textarea', array(
 861                                         'readonly' => 'readonly',
 862                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 863                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 864                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 865                         Xml::openElement( 'div' ) .
 866                         Xml::openElement( 'form', array(
 867                                 'method' => 'post',
 868                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 869                         Xml::element( 'input', array(
 870                                 'type' => 'hidden',
 871                                 'name' => 'target',
 872                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 873                         Xml::element( 'input', array(
 874                                 'type' => 'hidden',
 875                                 'name' => 'timestamp',
 876                                 'value' => $timestamp ) ) .
 877                         Xml::element( 'input', array(
 878                                 'type' => 'hidden',
 879                                 'name' => 'wpEditToken',
 880                                 'value' => $wgUser->editToken() ) ) .
 881                         Xml::element( 'input', array(
 882                                 'type' => 'submit',
 883                                 'name' => 'preview',
 884                                 'value' => wfMsg( 'showpreview' ) ) ) .
 885                         Xml::element( 'input', array(
 886                                 'name' => 'diff',
 887                                 'type' => 'submit',
 888                                 'value' => wfMsg( 'showdiff' ) ) ) .
 889                         Xml::closeElement( 'form' ) .
 890                         Xml::closeElement( 'div' ) );
 891         }
 892
 893         /**
 894          * Get a revision-deletion link, or disabled link, or nothing, depending
 895          * on user permissions & the settings on the revision.
 896          *
 897          * Will use forward-compatible revision ID in the Special:RevDelete link
 898          * if possible, otherwise the timestamp-based ID which may break after
 899          * undeletion.
 900          *
 901          * @param Revision $rev
 902          * @return string HTML fragment
 903          */
 904         function revDeleteLink( $rev ) {
 905                 global $wgUser;
 906                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 907                 if( $canHide || ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
 908                         $skin = $wgUser->getSkin();
 909                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 910                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 911                         } else {
 912                                 if ( $rev->getId() ) {
 913                                         // RevDelete links using revision ID are stable across
 914                                         // page deletion and undeletion; use when possible.
 915                                         $query = array(
 916                                                 'type'   => 'revision',
 917                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 918                                                 'ids'    => $rev->getId()
 919                                         );
 920                                 } else {
 921                                         // Older deleted entries didn't save a revision ID.
 922                                         // We have to refer to these by timestamp, ick!
 923                                         $query = array(
 924                                                 'type'   => 'archive',
 925                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 926                                                 'ids'    => $rev->getTimestamp()
 927                                         );
 928                                 }
 929                                 return $skin->revDeleteLink( $query,
 930                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 931                         }
 932                 } else {
 933                         return '';
 934                 }
 935         }
 936
 937         /**
 938          * Build a diff display between this and the previous either deleted
 939          * or non-deleted edit.
 940          *
 941          * @param $previousRev Revision
 942          * @param $currentRev Revision
 943          * @return String: HTML
 944          */
 945         function showDiff( $previousRev, $currentRev ) {
 946                 global $wgOut;
 947
 948                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 949                 $diffEngine->showDiffStyle();
 950                 $wgOut->addHTML(
 951                         "<div>" .
 952                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 953                         "<col class='diff-marker' />" .
 954                         "<col class='diff-content' />" .
 955                         "<col class='diff-marker' />" .
 956                         "<col class='diff-content' />" .
 957                         "<tr>" .
 958                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 959                                 $this->diffHeader( $previousRev, 'o' ) .
 960                                 "</td>\n" .
 961                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 962                                 $this->diffHeader( $currentRev, 'n' ) .
 963                                 "</td>\n" .
 964                         "</tr>" .
 965                         $diffEngine->generateDiffBody(
 966                                 $previousRev->getText(), $currentRev->getText() ) .
 967                         "</table>" .
 968                         "</div>\n"
 969                 );
 970         }
 971
 972         /**
 973          * @param $rev Revision
 974          * @param $prefix
 975          * @return string
 976          */
 977         private function diffHeader( $rev, $prefix ) {
 978                 global $wgUser, $wgLang;
 979                 $sk = $wgUser->getSkin();
 980                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 981                 if( $isDeleted ) {
 982                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 983                         $targetPage = $this->getTitle();
 984                         $targetQuery = array(
 985                                 'target' => $this->mTargetObj->getPrefixedText(),
 986                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 987                         );
 988                 } else {
 989                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 990                         $targetPage = $rev->getTitle();
 991                         $targetQuery = array( 'oldid' => $rev->getId() );
 992                 }
 993                 // Add show/hide deletion links if available
 994                 $del = $this->revDeleteLink( $rev );
 995                 return
 996                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 997                                 $sk->link(
 998                                         $targetPage,
 999                                         wfMsgHtml(
1000                                                 'revisionasof',
1001                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
1002                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
1003                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
1004                                         ),
1005                                         array(),
1006                                         $targetQuery
1007                                 ) .
1008                         '</strong></div>' .
1009                         '<div id="mw-diff-'.$prefix.'title2">' .
1010                                 $sk->revUserTools( $rev ) . '<br />' .
1011                         '</div>' .
1012                         '<div id="mw-diff-'.$prefix.'title3">' .
1013                                 $sk->revComment( $rev ) . $del . '<br />' .
1014                         '</div>';
1015         }
1016
1017         /**
1018          * Show a form confirming whether a tokenless user really wants to see a file
1019          */
1020         private function showFileConfirmationForm( $key ) {
1021                 global $wgOut, $wgUser, $wgLang;
1022                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1023                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
1024                         $this->mTargetObj->getText(),
1025                         $wgLang->date( $file->getTimestamp() ),
1026                         $wgLang->time( $file->getTimestamp() ) );
1027                 $wgOut->addHTML(
1028                         Xml::openElement( 'form', array(
1029                                 'method' => 'POST',
1030                                 'action' => $this->getTitle()->getLocalURL(
1031                                         'target=' . urlencode( $this->mTarget ) .
1032                                         '&file=' . urlencode( $key ) .
1033                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
1034                                 )
1035                         ) .
1036                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
1037                         '</form>'
1038                 );
1039         }
1040
1041         /**
1042          * Show a deleted file version requested by the visitor.
1043          */
1044         private function showFile( $key ) {
1045                 global $wgOut, $wgRequest;
1046                 $wgOut->disable();
1047
1048                 # We mustn't allow the output to be Squid cached, otherwise
1049                 # if an admin previews a deleted image, and it's cached, then
1050                 # a user without appropriate permissions can toddle off and
1051                 # nab the image, and Squid will serve it
1052                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1053                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1054                 $wgRequest->response()->header( 'Pragma: no-cache' );
1055
1056                 global $IP;
1057                 require_once( "$IP/includes/StreamFile.php" );
1058                 $repo = RepoGroup::singleton()->getLocalRepo();
1059                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1060                 wfStreamFile( $path );
1061         }
1062
1063         private function showHistory() {
1064                 global $wgUser, $wgOut;
1065
1066                 $sk = $wgUser->getSkin();
1067                 if( $this->mAllowed ) {
1068                         $wgOut->addModules( 'mediawiki.special.undelete' );
1069                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
1070                 } else {
1071                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
1072                 }
1073                 $wgOut->wrapWikiMsg(
1074                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1075                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1076                 );
1077
1078                 $archive = new PageArchive( $this->mTargetObj );
1079                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1080                 /*
1081                 $text = $archive->getLastRevisionText();
1082                 if( is_null( $text ) ) {
1083                         $wgOut->addWikiMsg( 'nohistory' );
1084                         return;
1085                 }
1086                 */
1087                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1088                 if ( $this->mAllowed ) {
1089                         $wgOut->addWikiMsg( 'undeletehistory' );
1090                         $wgOut->addWikiMsg( 'undeleterevdel' );
1091                 } else {
1092                         $wgOut->addWikiMsg( 'undeletehistorynoadmin' );
1093                 }
1094                 $wgOut->addHTML( '</div>' );
1095
1096                 # List all stored revisions
1097                 $revisions = $archive->listRevisions();
1098                 $files = $archive->listFiles();
1099
1100                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1101                 $haveFiles = $files && $files->numRows() > 0;
1102
1103                 # Batch existence check on user and talk pages
1104                 if( $haveRevisions ) {
1105                         $batch = new LinkBatch();
1106                         foreach ( $revisions as $row ) {
1107                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1108                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1109                         }
1110                         $batch->execute();
1111                         $revisions->seek( 0 );
1112                 }
1113                 if( $haveFiles ) {
1114                         $batch = new LinkBatch();
1115                         foreach ( $files as $row ) {
1116                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1117                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1118                         }
1119                         $batch->execute();
1120                         $files->seek( 0 );
1121                 }
1122
1123                 if ( $this->mAllowed ) {
1124                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1125                         # Start the form here
1126                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1127                         $wgOut->addHTML( $top );
1128                 }
1129
1130                 # Show relevant lines from the deletion log:
1131                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1132                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1133                 # Show relevant lines from the suppression log:
1134                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1135                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1136                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1137                 }
1138
1139                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1140                         # Format the user-visible controls (comment field, submission button)
1141                         # in a nice little table
1142                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1143                                 $unsuppressBox =
1144                                         "<tr>
1145                                                 <td>&#160;</td>
1146                                                 <td class='mw-input'>" .
1147                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1148                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1149                                                 "</td>
1150                                         </tr>";
1151                         } else {
1152                                 $unsuppressBox = '';
1153                         }
1154                         $table =
1155                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1156                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1157                                         "<tr>
1158                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1159                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1160                                                 "</td>
1161                                         </tr>
1162                                         <tr>
1163                                                 <td class='mw-label'>" .
1164                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1165                                                 "</td>
1166                                                 <td class='mw-input'>" .
1167                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1168                                                 "</td>
1169                                         </tr>
1170                                         <tr>
1171                                                 <td>&#160;</td>
1172                                                 <td class='mw-submit'>" .
1173                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1174                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1175                                                 "</td>
1176                                         </tr>" .
1177                                         $unsuppressBox .
1178                                 Xml::closeElement( 'table' ) .
1179                                 Xml::closeElement( 'fieldset' );
1180
1181                         $wgOut->addHTML( $table );
1182                 }
1183
1184                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1185
1186                 if( $haveRevisions ) {
1187                         # The page's stored (deleted) history:
1188                         $wgOut->addHTML( '<ul>' );
1189                         $remaining = $revisions->numRows();
1190                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1191
1192                         foreach ( $revisions as $row ) {
1193                                 $remaining--;
1194                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1195                         }
1196                         $revisions->free();
1197                         $wgOut->addHTML( '</ul>' );
1198                 } else {
1199                         $wgOut->addWikiMsg( 'nohistory' );
1200                 }
1201
1202                 if( $haveFiles ) {
1203                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1204                         $wgOut->addHTML( '<ul>' );
1205                         foreach ( $files as $row ) {
1206                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1207                         }
1208                         $files->free();
1209                         $wgOut->addHTML( '</ul>' );
1210                 }
1211
1212                 if ( $this->mAllowed ) {
1213                         # Slip in the hidden controls here
1214                         $misc  = Html::hidden( 'target', $this->mTarget );
1215                         $misc .= Html::hidden( 'wpEditToken', $wgUser->editToken() );
1216                         $misc .= Xml::closeElement( 'form' );
1217                         $wgOut->addHTML( $misc );
1218                 }
1219
1220                 return true;
1221         }
1222
1223         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1224                 global $wgLang;
1225
1226                 $rev = Revision::newFromArchiveRow( $row,
1227                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1228                 $stxt = '';
1229                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1230                 // Build checkboxen...
1231                 if( $this->mAllowed ) {
1232                         if( $this->mInvert ) {
1233                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1234                                         $checkBox = Xml::check( "ts$ts" );
1235                                 } else {
1236                                         $checkBox = Xml::check( "ts$ts", true );
1237                                 }
1238                         } else {
1239                                 $checkBox = Xml::check( "ts$ts" );
1240                         }
1241                 } else {
1242                         $checkBox = '';
1243                 }
1244                 // Build page & diff links...
1245                 if( $this->mCanView ) {
1246                         $titleObj = $this->getTitle();
1247                         # Last link
1248                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1249                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1250                                 $last = wfMsgHtml( 'diff' );
1251                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1252                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1253                                 $last = $sk->linkKnown(
1254                                         $titleObj,
1255                                         wfMsgHtml( 'diff' ),
1256                                         array(),
1257                                         array(
1258                                                 'target' => $this->mTargetObj->getPrefixedText(),
1259                                                 'timestamp' => $ts,
1260                                                 'diff' => 'prev'
1261                                         )
1262                                 );
1263                         } else {
1264                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1265                                 $last = wfMsgHtml( 'diff' );
1266                         }
1267                 } else {
1268                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1269                         $last = wfMsgHtml( 'diff' );
1270                 }
1271                 // User links
1272                 $userLink = $sk->revUserTools( $rev );
1273                 // Revision text size
1274                 $size = $row->ar_len;
1275                 if( !is_null( $size ) ) {
1276                         $stxt = $sk->formatRevisionSize( $size );
1277                 }
1278                 // Edit summary
1279                 $comment = $sk->revComment( $rev );
1280                 // Revision delete links
1281                 $revdlink = $this->revDeleteLink( $rev );
1282                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1283         }
1284
1285         private function formatFileRow( $row, $sk ) {
1286                 global $wgUser, $wgLang;
1287
1288                 $file = ArchivedFile::newFromRow( $row );
1289
1290                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1291                 if( $this->mAllowed && $row->fa_storage_key ) {
1292                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1293                         $key = urlencode( $row->fa_storage_key );
1294                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1295                 } else {
1296                         $checkBox = '';
1297                         $pageLink = $wgLang->timeanddate( $ts, true );
1298                 }
1299                 $userLink = $this->getFileUser( $file, $sk );
1300                 $data =
1301                         wfMsg( 'widthheight',
1302                                 $wgLang->formatNum( $row->fa_width ),
1303                                 $wgLang->formatNum( $row->fa_height ) ) .
1304                         ' (' .
1305                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1306                         ')';
1307                 $data = htmlspecialchars( $data );
1308                 $comment = $this->getFileComment( $file, $sk );
1309                 // Add show/hide deletion links if available
1310                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1311                 if( $canHide || ( $file->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1312                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1313                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1314                         } else {
1315                                 $query = array(
1316                                         'type' => 'filearchive',
1317                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1318                                         'ids' => $row->fa_id
1319                                 );
1320                                 $revdlink = $sk->revDeleteLink( $query,
1321                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1322                         }
1323                 } else {
1324                         $revdlink = '';
1325                 }
1326                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1327         }
1328
1329         /**
1330          * Fetch revision text link if it's available to all users
1331          *
1332          * @param $rev Revision
1333          * @param $sk Skin
1334          * @return string
1335          */
1336         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1337                 global $wgLang;
1338
1339                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1340
1341                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1342                         return '<span class="history-deleted">' . $time . '</span>';
1343                 } else {
1344                         $link = $sk->linkKnown(
1345                                 $titleObj,
1346                                 $time,
1347                                 array(),
1348                                 array(
1349                                         'target' => $this->mTargetObj->getPrefixedText(),
1350                                         'timestamp' => $ts
1351                                 )
1352                         );
1353                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1354                                 $link = '<span class="history-deleted">' . $link . '</span>';
1355                         }
1356                         return $link;
1357                 }
1358         }
1359
1360         /**
1361          * Fetch image view link if it's available to all users
1362          *
1363          * @param $file File
1364          * @param $sk Skin
1365          * @return String: HTML fragment
1366          */
1367         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1368                 global $wgLang, $wgUser;
1369
1370                 if( !$file->userCan( File::DELETED_FILE ) ) {
1371                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1372                 } else {
1373                         $link = $sk->linkKnown(
1374                                 $titleObj,
1375                                 $wgLang->timeanddate( $ts, true ),
1376                                 array(),
1377                                 array(
1378                                         'target' => $this->mTargetObj->getPrefixedText(),
1379                                         'file' => $key,
1380                                         'token' => $wgUser->editToken( $key )
1381                                 )
1382                         );
1383                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1384                                 $link = '<span class="history-deleted">' . $link . '</span>';
1385                         }
1386                         return $link;
1387                 }
1388         }
1389
1390         /**
1391          * Fetch file's user id if it's available to this user
1392          *
1393          * @param $file File
1394          * @param $sk Skin
1395          * @return String: HTML fragment
1396          */
1397         function getFileUser( $file, $sk ) {
1398                 if( !$file->userCan( File::DELETED_USER ) ) {
1399                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1400                 } else {
1401                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1402                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1403                         if( $file->isDeleted( File::DELETED_USER ) ) {
1404                                 $link = '<span class="history-deleted">' . $link . '</span>';
1405                         }
1406                         return $link;
1407                 }
1408         }
1409
1410         /**
1411          * Fetch file upload comment if it's available to this user
1412          *
1413          * @param $file File
1414          * @param $sk Skin
1415          * @return String: HTML fragment
1416          */
1417         function getFileComment( $file, $sk ) {
1418                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1419                         return '<span class="history-deleted"><span class="comment">' .
1420                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1421                 } else {
1422                         $link = $sk->commentBlock( $file->getRawDescription() );
1423                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1424                                 $link = '<span class="history-deleted">' . $link . '</span>';
1425                         }
1426                         return $link;
1427                 }
1428         }
1429
1430         function undelete() {
1431                 global $wgOut, $wgUser;
1432                 if ( wfReadOnly() ) {
1433                         $wgOut->readOnlyPage();
1434                         return;
1435                 }
1436                 if( !is_null( $this->mTargetObj ) ) {
1437                         $archive = new PageArchive( $this->mTargetObj );
1438                         wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1439                         $ok = $archive->undelete(
1440                                 $this->mTargetTimestamp,
1441                                 $this->mComment,
1442                                 $this->mFileVersions,
1443                                 $this->mUnsuppress );
1444
1445                         if( is_array( $ok ) ) {
1446                                 if ( $ok[1] ) { // Undeleted file count
1447                                         wfRunHooks( 'FileUndeleteComplete', array(
1448                                                 $this->mTargetObj, $this->mFileVersions,
1449                                                 $wgUser, $this->mComment ) );
1450                                 }
1451
1452                                 $skin = $wgUser->getSkin();
1453                                 $link = $skin->linkKnown( $this->mTargetObj );
1454                                 $wgOut->addWikiMsgArray( 'undeletedpage', array( $link ), array( 'replaceafter' ) );
1455                         } else {
1456                                 $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1457                                 $wgOut->addWikiMsg( 'undeleterevdel' );
1458                         }
1459
1460                         // Show file deletion warnings and errors
1461                         $status = $archive->getFileStatus();
1462                         if( $status && !$status->isGood() ) {
1463                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1464                         }
1465                 } else {
1466                         $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1467                 }
1468                 return false;
1469         }
1470 }