includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30
  31         /**
  32          * @var Title
  33          */
  34         protected $title;
  35         var $fileStatus;
  36
  37         function __construct( $title ) {
  38                 if( is_null( $title ) ) {
  39                         throw new MWException( __METHOD__ . ' given a null title.' );
  40                 }
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * List all deleted pages recorded in the archive table. Returns result
  46          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  47          * namespace/title.
  48          *
  49          * @return ResultWrapper
  50          */
  51         public static function listAllPages() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53                 return self::listPages( $dbr, '' );
  54         }
  55
  56         /**
  57          * List deleted pages recorded in the archive table matching the
  58          * given title prefix.
  59          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  60          *
  61          * @param $prefix String: title prefix
  62          * @return ResultWrapper
  63          */
  64         public static function listPagesByPrefix( $prefix ) {
  65                 $dbr = wfGetDB( DB_SLAVE );
  66
  67                 $title = Title::newFromText( $prefix );
  68                 if( $title ) {
  69                         $ns = $title->getNamespace();
  70                         $prefix = $title->getDBkey();
  71                 } else {
  72                         // Prolly won't work too good
  73                         // @todo handle bare namespace names cleanly?
  74                         $ns = 0;
  75                 }
  76                 $conds = array(
  77                         'ar_namespace' => $ns,
  78                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  79                 );
  80                 return self::listPages( $dbr, $conds );
  81         }
  82
  83         protected static function listPages( $dbr, $condition ) {
  84                 return $dbr->resultObject(
  85                         $dbr->select(
  86                                 array( 'archive' ),
  87                                 array(
  88                                         'ar_namespace',
  89                                         'ar_title',
  90                                         'COUNT(*) AS count'
  91                                 ),
  92                                 $condition,
  93                                 __METHOD__,
  94                                 array(
  95                                         'GROUP BY' => 'ar_namespace,ar_title',
  96                                         'ORDER BY' => 'ar_namespace,ar_title',
  97                                         'LIMIT' => 100,
  98                                 )
  99                         )
 100                 );
 101         }
 102
 103         /**
 104          * List the revisions of the given page. Returns result wrapper with
 105          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 106          *
 107          * @return ResultWrapper
 108          */
 109         function listRevisions() {
 110                 $dbr = wfGetDB( DB_SLAVE );
 111                 $res = $dbr->select( 'archive',
 112                         array(
 113                                 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 114                                 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id'
 115                         ),
 116                         array( 'ar_namespace' => $this->title->getNamespace(),
 117                                    'ar_title' => $this->title->getDBkey() ),
 118                         'PageArchive::listRevisions',
 119                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 120                 $ret = $dbr->resultObject( $res );
 121                 return $ret;
 122         }
 123
 124         /**
 125          * List the deleted file revisions for this page, if it's a file page.
 126          * Returns a result wrapper with various filearchive fields, or null
 127          * if not a file page.
 128          *
 129          * @return ResultWrapper
 130          * @todo Does this belong in Image for fuller encapsulation?
 131          */
 132         function listFiles() {
 133                 if( $this->title->getNamespace() == NS_FILE ) {
 134                         $dbr = wfGetDB( DB_SLAVE );
 135                         $res = $dbr->select( 'filearchive',
 136                                 array(
 137                                         'fa_id',
 138                                         'fa_name',
 139                                         'fa_archive_name',
 140                                         'fa_storage_key',
 141                                         'fa_storage_group',
 142                                         'fa_size',
 143                                         'fa_width',
 144                                         'fa_height',
 145                                         'fa_bits',
 146                                         'fa_metadata',
 147                                         'fa_media_type',
 148                                         'fa_major_mime',
 149                                         'fa_minor_mime',
 150                                         'fa_description',
 151                                         'fa_user',
 152                                         'fa_user_text',
 153                                         'fa_timestamp',
 154                                         'fa_deleted' ),
 155                                 array( 'fa_name' => $this->title->getDBkey() ),
 156                                 __METHOD__,
 157                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 158                         $ret = $dbr->resultObject( $res );
 159                         return $ret;
 160                 }
 161                 return null;
 162         }
 163
 164         /**
 165          * Return a Revision object containing data for the deleted revision.
 166          * Note that the result *may* or *may not* have a null page ID.
 167          *
 168          * @param $timestamp String
 169          * @return Revision
 170          */
 171         function getRevision( $timestamp ) {
 172                 $dbr = wfGetDB( DB_SLAVE );
 173                 $row = $dbr->selectRow( 'archive',
 174                         array(
 175                                 'ar_rev_id',
 176                                 'ar_text',
 177                                 'ar_comment',
 178                                 'ar_user',
 179                                 'ar_user_text',
 180                                 'ar_timestamp',
 181                                 'ar_minor_edit',
 182                                 'ar_flags',
 183                                 'ar_text_id',
 184                                 'ar_deleted',
 185                                 'ar_len' ),
 186                         array( 'ar_namespace' => $this->title->getNamespace(),
 187                                    'ar_title' => $this->title->getDBkey(),
 188                                    'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 189                         __METHOD__ );
 190                 if( $row ) {
 191                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 192                 } else {
 193                         return null;
 194                 }
 195         }
 196
 197         /**
 198          * Return the most-previous revision, either live or deleted, against
 199          * the deleted revision given by timestamp.
 200          *
 201          * May produce unexpected results in case of history merges or other
 202          * unusual time issues.
 203          *
 204          * @param $timestamp String
 205          * @return Revision or null
 206          */
 207         function getPreviousRevision( $timestamp ) {
 208                 $dbr = wfGetDB( DB_SLAVE );
 209
 210                 // Check the previous deleted revision...
 211                 $row = $dbr->selectRow( 'archive',
 212                         'ar_timestamp',
 213                         array( 'ar_namespace' => $this->title->getNamespace(),
 214                                    'ar_title' => $this->title->getDBkey(),
 215                                    'ar_timestamp < ' .
 216                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 217                         __METHOD__,
 218                         array(
 219                                 'ORDER BY' => 'ar_timestamp DESC',
 220                                 'LIMIT' => 1 ) );
 221                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 222
 223                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 224                         array( 'rev_id', 'rev_timestamp' ),
 225                         array(
 226                                 'page_namespace' => $this->title->getNamespace(),
 227                                 'page_title' => $this->title->getDBkey(),
 228                                 'page_id = rev_page',
 229                                 'rev_timestamp < ' .
 230                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 231                         __METHOD__,
 232                         array(
 233                                 'ORDER BY' => 'rev_timestamp DESC',
 234                                 'LIMIT' => 1 ) );
 235                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 236                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 237
 238                 if( $prevLive && $prevLive > $prevDeleted ) {
 239                         // Most prior revision was live
 240                         return Revision::newFromId( $prevLiveId );
 241                 } elseif( $prevDeleted ) {
 242                         // Most prior revision was deleted
 243                         return $this->getRevision( $prevDeleted );
 244                 } else {
 245                         // No prior revision on this page.
 246                         return null;
 247                 }
 248         }
 249
 250         /**
 251          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 252          *
 253          * @param $row Object: database row
 254          * @return Revision
 255          */
 256         function getTextFromRow( $row ) {
 257                 if( is_null( $row->ar_text_id ) ) {
 258                         // An old row from MediaWiki 1.4 or previous.
 259                         // Text is embedded in this row in classic compression format.
 260                         return Revision::getRevisionText( $row, 'ar_' );
 261                 } else {
 262                         // New-style: keyed to the text storage backend.
 263                         $dbr = wfGetDB( DB_SLAVE );
 264                         $text = $dbr->selectRow( 'text',
 265                                 array( 'old_text', 'old_flags' ),
 266                                 array( 'old_id' => $row->ar_text_id ),
 267                                 __METHOD__ );
 268                         return Revision::getRevisionText( $text );
 269                 }
 270         }
 271
 272         /**
 273          * Fetch (and decompress if necessary) the stored text of the most
 274          * recently edited deleted revision of the page.
 275          *
 276          * If there are no archived revisions for the page, returns NULL.
 277          *
 278          * @return String
 279          */
 280         function getLastRevisionText() {
 281                 $dbr = wfGetDB( DB_SLAVE );
 282                 $row = $dbr->selectRow( 'archive',
 283                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 284                         array( 'ar_namespace' => $this->title->getNamespace(),
 285                                    'ar_title' => $this->title->getDBkey() ),
 286                         __METHOD__,
 287                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 288                 if( $row ) {
 289                         return $this->getTextFromRow( $row );
 290                 } else {
 291                         return null;
 292                 }
 293         }
 294
 295         /**
 296          * Quick check if any archived revisions are present for the page.
 297          *
 298          * @return Boolean
 299          */
 300         function isDeleted() {
 301                 $dbr = wfGetDB( DB_SLAVE );
 302                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 303                         array( 'ar_namespace' => $this->title->getNamespace(),
 304                                    'ar_title' => $this->title->getDBkey() ) );
 305                 return ( $n > 0 );
 306         }
 307
 308         /**
 309          * Restore the given (or all) text and file revisions for the page.
 310          * Once restored, the items will be removed from the archive tables.
 311          * The deletion log will be updated with an undeletion notice.
 312          *
 313          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 314          * @param $comment String
 315          * @param $fileVersions Array
 316          * @param $unsuppress Boolean
 317          *
 318          * @return array(number of file revisions restored, number of image revisions restored, log message)
 319          * on success, false on failure
 320          */
 321         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 322                 // If both the set of text revisions and file revisions are empty,
 323                 // restore everything. Otherwise, just restore the requested items.
 324                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 325
 326                 $restoreText = $restoreAll || !empty( $timestamps );
 327                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 328
 329                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 330                         $img = wfLocalFile( $this->title );
 331                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 332                         if ( !$this->fileStatus->isOk() ) {
 333                                 return false;
 334                         }
 335                         $filesRestored = $this->fileStatus->successCount;
 336                 } else {
 337                         $filesRestored = 0;
 338                 }
 339
 340                 if( $restoreText ) {
 341                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 342                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 343                                 return false;
 344                         }
 345                 } else {
 346                         $textRestored = 0;
 347                 }
 348
 349                 // Touch the log!
 350                 global $wgContLang;
 351                 $log = new LogPage( 'delete' );
 352
 353                 if( $textRestored && $filesRestored ) {
 354                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 355                                 $wgContLang->formatNum( $textRestored ),
 356                                 $wgContLang->formatNum( $filesRestored ) );
 357                 } elseif( $textRestored ) {
 358                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 359                                 $wgContLang->formatNum( $textRestored ) );
 360                 } elseif( $filesRestored ) {
 361                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 362                                 $wgContLang->formatNum( $filesRestored ) );
 363                 } else {
 364                         wfDebug( "Undelete: nothing undeleted...\n" );
 365                         return false;
 366                 }
 367
 368                 if( trim( $comment ) != '' ) {
 369                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 370                 }
 371                 $log->addEntry( 'restore', $this->title, $reason );
 372
 373                 return array( $textRestored, $filesRestored, $reason );
 374         }
 375
 376         /**
 377          * This is the meaty bit -- restores archived revisions of the given page
 378          * to the cur/old tables. If the page currently exists, all revisions will
 379          * be stuffed into old, otherwise the most recent will go into cur.
 380          *
 381          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 382          * @param $comment String
 383          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 384          *
 385          * @return Mixed: number of revisions restored or false on failure
 386          */
 387         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 388                 if ( wfReadOnly() ) {
 389                         return false;
 390                 }
 391                 $restoreAll = empty( $timestamps );
 392
 393                 $dbw = wfGetDB( DB_MASTER );
 394
 395                 # Does this page already exist? We'll have to update it...
 396                 $article = new Article( $this->title );
 397                 $options = 'FOR UPDATE'; // lock page
 398                 $page = $dbw->selectRow( 'page',
 399                         array( 'page_id', 'page_latest' ),
 400                         array( 'page_namespace' => $this->title->getNamespace(),
 401                                    'page_title'     => $this->title->getDBkey() ),
 402                         __METHOD__,
 403                         $options
 404                 );
 405                 if( $page ) {
 406                         $makepage = false;
 407                         # Page already exists. Import the history, and if necessary
 408                         # we'll update the latest revision field in the record.
 409                         $newid             = 0;
 410                         $pageId            = $page->page_id;
 411                         $previousRevId    = $page->page_latest;
 412                         # Get the time span of this page
 413                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 414                                 array( 'rev_id' => $previousRevId ),
 415                                 __METHOD__ );
 416                         if( $previousTimestamp === false ) {
 417                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 418                                 return 0;
 419                         }
 420                 } else {
 421                         # Have to create a new article...
 422                         $makepage = true;
 423                         $previousRevId = 0;
 424                         $previousTimestamp = 0;
 425                 }
 426
 427                 if( $restoreAll ) {
 428                         $oldones = '1 = 1'; # All revisions...
 429                 } else {
 430                         $oldts = implode( ',',
 431                                 array_map( array( &$dbw, 'addQuotes' ),
 432                                         array_map( array( &$dbw, 'timestamp' ),
 433                                                 $timestamps ) ) );
 434
 435                         $oldones = "ar_timestamp IN ( {$oldts} )";
 436                 }
 437
 438                 /**
 439                  * Select each archived revision...
 440                  */
 441                 $result = $dbw->select( 'archive',
 442                         /* fields */ array(
 443                                 'ar_rev_id',
 444                                 'ar_text',
 445                                 'ar_comment',
 446                                 'ar_user',
 447                                 'ar_user_text',
 448                                 'ar_timestamp',
 449                                 'ar_minor_edit',
 450                                 'ar_flags',
 451                                 'ar_text_id',
 452                                 'ar_deleted',
 453                                 'ar_page_id',
 454                                 'ar_len' ),
 455                         /* WHERE */ array(
 456                                 'ar_namespace' => $this->title->getNamespace(),
 457                                 'ar_title'     => $this->title->getDBkey(),
 458                                 $oldones ),
 459                         __METHOD__,
 460                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 461                 );
 462                 $ret = $dbw->resultObject( $result );
 463                 $rev_count = $dbw->numRows( $result );
 464                 if( !$rev_count ) {
 465                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 466                         return false; // ???
 467                 }
 468
 469                 $ret->seek( $rev_count - 1 ); // move to last
 470                 $row = $ret->fetchObject(); // get newest archived rev
 471                 $ret->seek( 0 ); // move back
 472
 473                 if( $makepage ) {
 474                         // Check the state of the newest to-be version...
 475                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 476                                 return false; // we can't leave the current revision like this!
 477                         }
 478                         // Safe to insert now...
 479                         $newid  = $article->insertOn( $dbw );
 480                         $pageId = $newid;
 481                 } else {
 482                         // Check if a deleted revision will become the current revision...
 483                         if( $row->ar_timestamp > $previousTimestamp ) {
 484                                 // Check the state of the newest to-be version...
 485                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 486                                         return false; // we can't leave the current revision like this!
 487                                 }
 488                         }
 489                 }
 490
 491                 $revision = null;
 492                 $restored = 0;
 493
 494                 foreach ( $ret as $row ) {
 495                         // Check for key dupes due to shitty archive integrity.
 496                         if( $row->ar_rev_id ) {
 497                                 $exists = $dbw->selectField( 'revision', '1',
 498                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 499                                 if( $exists ) {
 500                                         continue; // don't throw DB errors
 501                                 }
 502                         }
 503                         // Insert one revision at a time...maintaining deletion status
 504                         // unless we are specifically removing all restrictions...
 505                         $revision = Revision::newFromArchiveRow( $row,
 506                                 array(
 507                                         'page' => $pageId,
 508                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 509                                 ) );
 510
 511                         $revision->insertOn( $dbw );
 512                         $restored++;
 513
 514                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 515                 }
 516                 # Now that it's safely stored, take it out of the archive
 517                 $dbw->delete( 'archive',
 518                         /* WHERE */ array(
 519                                 'ar_namespace' => $this->title->getNamespace(),
 520                                 'ar_title' => $this->title->getDBkey(),
 521                                 $oldones ),
 522                         __METHOD__ );
 523
 524                 // Was anything restored at all?
 525                 if ( $restored == 0 ) {
 526                         return 0;
 527                 }
 528
 529                 // Attach the latest revision to the page...
 530                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 531                 if ( $newid || $wasnew ) {
 532                         // Update site stats, link tables, etc
 533                         $article->createUpdates( $revision );
 534                 }
 535
 536                 if( $newid ) {
 537                         wfRunHooks( 'ArticleUndelete', array( &$this->title, true, $comment ) );
 538                         Article::onArticleCreate( $this->title );
 539                 } else {
 540                         wfRunHooks( 'ArticleUndelete', array( &$this->title, false, $comment ) );
 541                         Article::onArticleEdit( $this->title );
 542                 }
 543
 544                 if( $this->title->getNamespace() == NS_FILE ) {
 545                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 546                         $update->doUpdate();
 547                 }
 548
 549                 return $restored;
 550         }
 551
 552         /**
 553          * @return Status
 554          */
 555         function getFileStatus() { return $this->fileStatus; }
 556 }
 557
 558 /**
 559  * Special page allowing users with the appropriate permissions to view
 560  * and restore deleted content.
 561  *
 562  * @ingroup SpecialPage
 563  */
 564 class SpecialUndelete extends SpecialPage {
 565         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj, $mFile;
 566         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 567
 568         function __construct( $request = null ) {
 569                 parent::__construct( 'Undelete', 'deletedhistory' );
 570
 571                 if ( $request === null ) {
 572                         global $wgRequest;
 573                         $this->mRequest = $wgRequest;
 574                 } else {
 575                         $this->mRequest = $request;
 576                 }
 577         }
 578
 579         function loadRequest() {
 580                 global $wgUser;
 581                 $this->mAction = $this->mRequest->getVal( 'action' );
 582                 $this->mTarget = $this->mRequest->getVal( 'target' );
 583                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 584                 $time = $this->mRequest->getVal( 'timestamp' );
 585                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 586                 $this->mFile = $this->mRequest->getVal( 'file' );
 587
 588                 $posted = $this->mRequest->wasPosted() &&
 589                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 590                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 591                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 592                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 593                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 594                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 595                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 596                 $this->mToken = $this->mRequest->getVal( 'token' );
 597
 598                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 599                         $this->mAllowed = true; // user can restore
 600                         $this->mCanView = true; // user can view content
 601                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 602                         $this->mAllowed = false; // user cannot restore
 603                         $this->mCanView = true; // user can view content
 604                 } else { // user can only view the list of revisions
 605                         $this->mAllowed = false;
 606                         $this->mCanView = false;
 607                         $this->mTimestamp = '';
 608                         $this->mRestore = false;
 609                 }
 610
 611                 if( $this->mRestore || $this->mInvert ) {
 612                         $timestamps = array();
 613                         $this->mFileVersions = array();
 614                         foreach( $_REQUEST as $key => $val ) {
 615                                 $matches = array();
 616                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 617                                         array_push( $timestamps, $matches[1] );
 618                                 }
 619
 620                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 621                                         $this->mFileVersions[] = intval( $matches[1] );
 622                                 }
 623                         }
 624                         rsort( $timestamps );
 625                         $this->mTargetTimestamp = $timestamps;
 626                 }
 627         }
 628
 629         function execute( $par ) {
 630                 global $wgOut, $wgUser;
 631
 632                 $this->setHeaders();
 633                 if ( !$this->userCanExecute( $wgUser ) ) {
 634                         $this->displayRestrictionError();
 635                         return;
 636                 }
 637                 $this->outputHeader();
 638
 639                 $this->loadRequest();
 640
 641                 if ( $this->mAllowed ) {
 642                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 643                 } else {
 644                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
 645                 }
 646
 647                 if( $par != '' ) {
 648                         $this->mTarget = $par;
 649                 }
 650                 if ( $this->mTarget !== '' ) {
 651                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 652                         $wgUser->getSkin()->setRelevantTitle( $this->mTargetObj );
 653                 } else {
 654                         $this->mTargetObj = null;
 655                 }
 656
 657                 if( is_null( $this->mTargetObj ) ) {
 658                         # Not all users can just browse every deleted page from the list
 659                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 660                                 $this->showSearchForm();
 661
 662                                 # List undeletable articles
 663                                 if( $this->mSearchPrefix ) {
 664                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 665                                         $this->showList( $result );
 666                                 }
 667                         } else {
 668                                 $wgOut->addWikiMsg( 'undelete-header' );
 669                         }
 670                         return;
 671                 }
 672                 if( $this->mTimestamp !== '' ) {
 673                         return $this->showRevision( $this->mTimestamp );
 674                 }
 675                 if( $this->mFile !== null ) {
 676                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 677                         // Check if user is allowed to see this file
 678                         if ( !$file->exists() ) {
 679                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFile );
 680                                 return;
 681                         } else if( !$file->userCan( File::DELETED_FILE ) ) {
 682                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 683                                         $wgOut->permissionRequired( 'suppressrevision' );
 684                                 } else {
 685                                         $wgOut->permissionRequired( 'deletedtext' );
 686                                 }
 687                                 return false;
 688                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFile ) ) {
 689                                 $this->showFileConfirmationForm( $this->mFile );
 690                                 return false;
 691                         } else {
 692                                 return $this->showFile( $this->mFile );
 693                         }
 694                 }
 695                 if( $this->mRestore && $this->mAction == 'submit' ) {
 696                         global $wgUploadMaintenance;
 697                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 698                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 699                                 return;
 700                         }
 701                         return $this->undelete();
 702                 }
 703                 if( $this->mInvert && $this->mAction == 'submit' ) {
 704                         return $this->showHistory();
 705                 }
 706                 return $this->showHistory();
 707         }
 708
 709         function showSearchForm() {
 710                 global $wgOut, $wgScript;
 711                 $wgOut->addWikiMsg( 'undelete-header' );
 712
 713                 $wgOut->addHTML(
 714                         Xml::openElement( 'form', array(
 715                                 'method' => 'get',
 716                                 'action' => $wgScript ) ) .
 717                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 718                         Html::hidden( 'title',
 719                                 $this->getTitle()->getPrefixedDbKey() ) .
 720                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 721                                 'prefix', 'prefix', 20,
 722                                 $this->mSearchPrefix ) . ' ' .
 723                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 724                         Xml::closeElement( 'fieldset' ) .
 725                         Xml::closeElement( 'form' )
 726                 );
 727         }
 728
 729         // Generic list of deleted pages
 730         private function showList( $result ) {
 731                 global $wgLang, $wgUser, $wgOut;
 732
 733                 if( $result->numRows() == 0 ) {
 734                         $wgOut->addWikiMsg( 'undelete-no-results' );
 735                         return;
 736                 }
 737
 738                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 739
 740                 $sk = $wgUser->getSkin();
 741                 $undelete = $this->getTitle();
 742                 $wgOut->addHTML( "<ul>\n" );
 743                 foreach ( $result as $row ) {
 744                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 745                         $link = $sk->linkKnown(
 746                                 $undelete,
 747                                 htmlspecialchars( $title->getPrefixedText() ),
 748                                 array(),
 749                                 array( 'target' => $title->getPrefixedText() )
 750                         );
 751                         $revs = wfMsgExt( 'undeleterevisions',
 752                                 array( 'parseinline' ),
 753                                 $wgLang->formatNum( $row->count ) );
 754                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 755                 }
 756                 $result->free();
 757                 $wgOut->addHTML( "</ul>\n" );
 758
 759                 return true;
 760         }
 761
 762         private function showRevision( $timestamp ) {
 763                 global $wgLang, $wgUser, $wgOut;
 764
 765                 $skin = $wgUser->getSkin();
 766
 767                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 768                         return 0;
 769                 }
 770
 771                 $archive = new PageArchive( $this->mTargetObj );
 772                 $rev = $archive->getRevision( $timestamp );
 773
 774                 if( !$rev ) {
 775                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 776                         return;
 777                 }
 778
 779                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 780                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 781                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 782                                 return;
 783                         } else {
 784                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 785                                 $wgOut->addHTML( '<br />' );
 786                                 // and we are allowed to see...
 787                         }
 788                 }
 789
 790                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 791
 792                 $link = $skin->linkKnown(
 793                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 794                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 795                 );
 796
 797                 if( $this->mDiff ) {
 798                         $previousRev = $archive->getPreviousRevision( $timestamp );
 799                         if( $previousRev ) {
 800                                 $this->showDiff( $previousRev, $rev );
 801                                 if( $wgUser->getOption( 'diffonly' ) ) {
 802                                         return;
 803                                 } else {
 804                                         $wgOut->addHTML( '<hr />' );
 805                                 }
 806                         } else {
 807                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 808                         }
 809                 }
 810
 811                 // date and time are separate parameters to facilitate localisation.
 812                 // $time is kept for backward compat reasons.
 813                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 814                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 815                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 816                 $user = $skin->revUserTools( $rev );
 817
 818                 if( $this->mPreview ) {
 819                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 820                 } else {
 821                         $openDiv = '<div id="mw-undelete-revision">';
 822                 }
 823                 $wgOut->addHTML( $openDiv );
 824
 825                 // Revision delete links
 826                 if ( !$this->mDiff ) {
 827                         $revdel = $this->revDeleteLink( $rev );
 828                         if ( $revdel ) {
 829                                 $wgOut->addHTML( $revdel );
 830                         }
 831                 }
 832
 833                 $wgOut->addWikiMsgArray( 'undelete-revision', array( $link, $time, $user, $d, $t ), array( 'replaceafter' ) );
 834                 $wgOut->addHTML( '</div>' );
 835                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 836
 837                 if( $this->mPreview ) {
 838                         // Hide [edit]s
 839                         $popts = $wgOut->parserOptions();
 840                         $popts->setEditSection( false );
 841                         $wgOut->parserOptions( $popts );
 842                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 843                 }
 844
 845                 $wgOut->addHTML(
 846                         Xml::element( 'textarea', array(
 847                                         'readonly' => 'readonly',
 848                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 849                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 850                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 851                         Xml::openElement( 'div' ) .
 852                         Xml::openElement( 'form', array(
 853                                 'method' => 'post',
 854                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 855                         Xml::element( 'input', array(
 856                                 'type' => 'hidden',
 857                                 'name' => 'target',
 858                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 859                         Xml::element( 'input', array(
 860                                 'type' => 'hidden',
 861                                 'name' => 'timestamp',
 862                                 'value' => $timestamp ) ) .
 863                         Xml::element( 'input', array(
 864                                 'type' => 'hidden',
 865                                 'name' => 'wpEditToken',
 866                                 'value' => $wgUser->editToken() ) ) .
 867                         Xml::element( 'input', array(
 868                                 'type' => 'submit',
 869                                 'name' => 'preview',
 870                                 'value' => wfMsg( 'showpreview' ) ) ) .
 871                         Xml::element( 'input', array(
 872                                 'name' => 'diff',
 873                                 'type' => 'submit',
 874                                 'value' => wfMsg( 'showdiff' ) ) ) .
 875                         Xml::closeElement( 'form' ) .
 876                         Xml::closeElement( 'div' ) );
 877         }
 878
 879         /**
 880          * Get a revision-deletion link, or disabled link, or nothing, depending
 881          * on user permissions & the settings on the revision.
 882          *
 883          * Will use forward-compatible revision ID in the Special:RevDelete link
 884          * if possible, otherwise the timestamp-based ID which may break after
 885          * undeletion.
 886          *
 887          * @param Revision $rev
 888          * @return string HTML fragment
 889          */
 890         function revDeleteLink( $rev ) {
 891                 global $wgUser;
 892                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 893                 if( $canHide || ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
 894                         $skin = $wgUser->getSkin();
 895                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 896                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 897                         } else {
 898                                 if ( $rev->getId() ) {
 899                                         // RevDelete links using revision ID are stable across
 900                                         // page deletion and undeletion; use when possible.
 901                                         $query = array(
 902                                                 'type'   => 'revision',
 903                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 904                                                 'ids'    => $rev->getId()
 905                                         );
 906                                 } else {
 907                                         // Older deleted entries didn't save a revision ID.
 908                                         // We have to refer to these by timestamp, ick!
 909                                         $query = array(
 910                                                 'type'   => 'archive',
 911                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 912                                                 'ids'    => $rev->getTimestamp()
 913                                         );
 914                                 }
 915                                 return $skin->revDeleteLink( $query,
 916                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 917                         }
 918                 } else {
 919                         return '';
 920                 }
 921         }
 922
 923         /**
 924          * Build a diff display between this and the previous either deleted
 925          * or non-deleted edit.
 926          *
 927          * @param $previousRev Revision
 928          * @param $currentRev Revision
 929          * @return String: HTML
 930          */
 931         function showDiff( $previousRev, $currentRev ) {
 932                 global $wgOut;
 933
 934                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 935                 $diffEngine->showDiffStyle();
 936                 $wgOut->addHTML(
 937                         "<div>" .
 938                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 939                         "<col class='diff-marker' />" .
 940                         "<col class='diff-content' />" .
 941                         "<col class='diff-marker' />" .
 942                         "<col class='diff-content' />" .
 943                         "<tr>" .
 944                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 945                                 $this->diffHeader( $previousRev, 'o' ) .
 946                                 "</td>\n" .
 947                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 948                                 $this->diffHeader( $currentRev, 'n' ) .
 949                                 "</td>\n" .
 950                         "</tr>" .
 951                         $diffEngine->generateDiffBody(
 952                                 $previousRev->getText(), $currentRev->getText() ) .
 953                         "</table>" .
 954                         "</div>\n"
 955                 );
 956         }
 957
 958         /**
 959          * @param $rev Revision
 960          * @param $prefix
 961          * @return string
 962          */
 963         private function diffHeader( $rev, $prefix ) {
 964                 global $wgUser, $wgLang;
 965                 $sk = $wgUser->getSkin();
 966                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 967                 if( $isDeleted ) {
 968                         /// @todo Fixme: $rev->getTitle() is null for deleted revs...?
 969                         $targetPage = $this->getTitle();
 970                         $targetQuery = array(
 971                                 'target' => $this->mTargetObj->getPrefixedText(),
 972                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 973                         );
 974                 } else {
 975                         /// @todo Fixme getId() may return non-zero for deleted revs...
 976                         $targetPage = $rev->getTitle();
 977                         $targetQuery = array( 'oldid' => $rev->getId() );
 978                 }
 979                 // Add show/hide deletion links if available
 980                 $del .= $this->revDeleteLink( $rev );
 981                 return
 982                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 983                                 $sk->link(
 984                                         $targetPage,
 985                                         wfMsgHtml(
 986                                                 'revisionasof',
 987                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 988                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
 989                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
 990                                         ),
 991                                         array(),
 992                                         $targetQuery
 993                                 ) .
 994                         '</strong></div>' .
 995                         '<div id="mw-diff-'.$prefix.'title2">' .
 996                                 $sk->revUserTools( $rev ) . '<br />' .
 997                         '</div>' .
 998                         '<div id="mw-diff-'.$prefix.'title3">' .
 999                                 $sk->revComment( $rev ) . $del . '<br />' .
1000                         '</div>';
1001         }
1002
1003         /**
1004          * Show a form confirming whether a tokenless user really wants to see a file
1005          */
1006         private function showFileConfirmationForm( $key ) {
1007                 global $wgOut, $wgUser, $wgLang;
1008                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
1009                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
1010                         $this->mTargetObj->getText(),
1011                         $wgLang->date( $file->getTimestamp() ),
1012                         $wgLang->time( $file->getTimestamp() ) );
1013                 $wgOut->addHTML(
1014                         Xml::openElement( 'form', array(
1015                                 'method' => 'POST',
1016                                 'action' => $this->getTitle()->getLocalURL(
1017                                         'target=' . urlencode( $this->mTarget ) .
1018                                         '&file=' . urlencode( $key ) .
1019                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
1020                                 )
1021                         ) .
1022                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
1023                         '</form>'
1024                 );
1025         }
1026
1027         /**
1028          * Show a deleted file version requested by the visitor.
1029          */
1030         private function showFile( $key ) {
1031                 global $wgOut, $wgRequest;
1032                 $wgOut->disable();
1033
1034                 # We mustn't allow the output to be Squid cached, otherwise
1035                 # if an admin previews a deleted image, and it's cached, then
1036                 # a user without appropriate permissions can toddle off and
1037                 # nab the image, and Squid will serve it
1038                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1039                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1040                 $wgRequest->response()->header( 'Pragma: no-cache' );
1041
1042                 global $IP;
1043                 require_once( "$IP/includes/StreamFile.php" );
1044                 $repo = RepoGroup::singleton()->getLocalRepo();
1045                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1046                 wfStreamFile( $path );
1047         }
1048
1049         private function showHistory() {
1050                 global $wgUser, $wgOut;
1051
1052                 $sk = $wgUser->getSkin();
1053                 if( $this->mAllowed ) {
1054                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
1055                 } else {
1056                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
1057                 }
1058
1059                 $wgOut->wrapWikiMsg(
1060                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1061                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1062                 );
1063
1064                 $archive = new PageArchive( $this->mTargetObj );
1065                 /*
1066                 $text = $archive->getLastRevisionText();
1067                 if( is_null( $text ) ) {
1068                         $wgOut->addWikiMsg( 'nohistory' );
1069                         return;
1070                 }
1071                 */
1072                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1073                 if ( $this->mAllowed ) {
1074                         $wgOut->addWikiMsg( 'undeletehistory' );
1075                         $wgOut->addWikiMsg( 'undeleterevdel' );
1076                 } else {
1077                         $wgOut->addWikiMsg( 'undeletehistorynoadmin' );
1078                 }
1079                 $wgOut->addHTML( '</div>' );
1080
1081                 # List all stored revisions
1082                 $revisions = $archive->listRevisions();
1083                 $files = $archive->listFiles();
1084
1085                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1086                 $haveFiles = $files && $files->numRows() > 0;
1087
1088                 # Batch existence check on user and talk pages
1089                 if( $haveRevisions ) {
1090                         $batch = new LinkBatch();
1091                         foreach ( $revisions as $row ) {
1092                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1093                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1094                         }
1095                         $batch->execute();
1096                         $revisions->seek( 0 );
1097                 }
1098                 if( $haveFiles ) {
1099                         $batch = new LinkBatch();
1100                         foreach ( $files as $row ) {
1101                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1102                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1103                         }
1104                         $batch->execute();
1105                         $files->seek( 0 );
1106                 }
1107
1108                 if ( $this->mAllowed ) {
1109                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1110                         # Start the form here
1111                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1112                         $wgOut->addHTML( $top );
1113                 }
1114
1115                 # Show relevant lines from the deletion log:
1116                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1117                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1118                 # Show relevant lines from the suppression log:
1119                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1120                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1121                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1122                 }
1123
1124                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1125                         # Format the user-visible controls (comment field, submission button)
1126                         # in a nice little table
1127                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1128                                 $unsuppressBox =
1129                                         "<tr>
1130                                                 <td>&#160;</td>
1131                                                 <td class='mw-input'>" .
1132                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1133                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1134                                                 "</td>
1135                                         </tr>";
1136                         } else {
1137                                 $unsuppressBox = '';
1138                         }
1139                         $table =
1140                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1141                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1142                                         "<tr>
1143                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1144                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1145                                                 "</td>
1146                                         </tr>
1147                                         <tr>
1148                                                 <td class='mw-label'>" .
1149                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1150                                                 "</td>
1151                                                 <td class='mw-input'>" .
1152                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1153                                                 "</td>
1154                                         </tr>
1155                                         <tr>
1156                                                 <td>&#160;</td>
1157                                                 <td class='mw-submit'>" .
1158                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1159                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) . ' ' .
1160                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1161                                                 "</td>
1162                                         </tr>" .
1163                                         $unsuppressBox .
1164                                 Xml::closeElement( 'table' ) .
1165                                 Xml::closeElement( 'fieldset' );
1166
1167                         $wgOut->addHTML( $table );
1168                 }
1169
1170                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1171
1172                 if( $haveRevisions ) {
1173                         # The page's stored (deleted) history:
1174                         $wgOut->addHTML( '<ul>' );
1175                         $remaining = $revisions->numRows();
1176                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1177
1178                         foreach ( $revisions as $row ) {
1179                                 $remaining--;
1180                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1181                         }
1182                         $revisions->free();
1183                         $wgOut->addHTML( '</ul>' );
1184                 } else {
1185                         $wgOut->addWikiMsg( 'nohistory' );
1186                 }
1187
1188                 if( $haveFiles ) {
1189                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1190                         $wgOut->addHTML( '<ul>' );
1191                         foreach ( $files as $row ) {
1192                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1193                         }
1194                         $files->free();
1195                         $wgOut->addHTML( '</ul>' );
1196                 }
1197
1198                 if ( $this->mAllowed ) {
1199                         # Slip in the hidden controls here
1200                         $misc  = Html::hidden( 'target', $this->mTarget );
1201                         $misc .= Html::hidden( 'wpEditToken', $wgUser->editToken() );
1202                         $misc .= Xml::closeElement( 'form' );
1203                         $wgOut->addHTML( $misc );
1204                 }
1205
1206                 return true;
1207         }
1208
1209         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1210                 global $wgLang;
1211
1212                 $rev = Revision::newFromArchiveRow( $row,
1213                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1214                 $stxt = '';
1215                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1216                 // Build checkboxen...
1217                 if( $this->mAllowed ) {
1218                         if( $this->mInvert ) {
1219                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1220                                         $checkBox = Xml::check( "ts$ts" );
1221                                 } else {
1222                                         $checkBox = Xml::check( "ts$ts", true );
1223                                 }
1224                         } else {
1225                                 $checkBox = Xml::check( "ts$ts" );
1226                         }
1227                 } else {
1228                         $checkBox = '';
1229                 }
1230                 // Build page & diff links...
1231                 if( $this->mCanView ) {
1232                         $titleObj = $this->getTitle();
1233                         # Last link
1234                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1235                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1236                                 $last = wfMsgHtml( 'diff' );
1237                         } else if( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1238                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1239                                 $last = $sk->linkKnown(
1240                                         $titleObj,
1241                                         wfMsgHtml( 'diff' ),
1242                                         array(),
1243                                         array(
1244                                                 'target' => $this->mTargetObj->getPrefixedText(),
1245                                                 'timestamp' => $ts,
1246                                                 'diff' => 'prev'
1247                                         )
1248                                 );
1249                         } else {
1250                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1251                                 $last = wfMsgHtml( 'diff' );
1252                         }
1253                 } else {
1254                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1255                         $last = wfMsgHtml( 'diff' );
1256                 }
1257                 // User links
1258                 $userLink = $sk->revUserTools( $rev );
1259                 // Revision text size
1260                 $size = $row->ar_len;
1261                 if( !is_null( $size ) ) {
1262                         $stxt = $sk->formatRevisionSize( $size );
1263                 }
1264                 // Edit summary
1265                 $comment = $sk->revComment( $rev );
1266                 // Revision delete links
1267                 $revdlink = $this->revDeleteLink( $rev );
1268                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1269         }
1270
1271         private function formatFileRow( $row, $sk ) {
1272                 global $wgUser, $wgLang;
1273
1274                 $file = ArchivedFile::newFromRow( $row );
1275
1276                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1277                 if( $this->mAllowed && $row->fa_storage_key ) {
1278                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1279                         $key = urlencode( $row->fa_storage_key );
1280                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1281                 } else {
1282                         $checkBox = '';
1283                         $pageLink = $wgLang->timeanddate( $ts, true );
1284                 }
1285                 $userLink = $this->getFileUser( $file, $sk );
1286                 $data =
1287                         wfMsg( 'widthheight',
1288                                 $wgLang->formatNum( $row->fa_width ),
1289                                 $wgLang->formatNum( $row->fa_height ) ) .
1290                         ' (' .
1291                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1292                         ')';
1293                 $data = htmlspecialchars( $data );
1294                 $comment = $this->getFileComment( $file, $sk );
1295                 // Add show/hide deletion links if available
1296                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1297                 if( $canHide || ( $file->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1298                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1299                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1300                         } else {
1301                                 $query = array(
1302                                         'type' => 'filearchive',
1303                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1304                                         'ids' => $row->fa_id
1305                                 );
1306                                 $revdlink = $sk->revDeleteLink( $query,
1307                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1308                         }
1309                 } else {
1310                         $revdlink = '';
1311                 }
1312                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1313         }
1314
1315         /**
1316          * Fetch revision text link if it's available to all users
1317          *
1318          * @param $rev Revision
1319          * @param $sk Skin
1320          * @return string
1321          */
1322         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1323                 global $wgLang;
1324
1325                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1326
1327                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1328                         return '<span class="history-deleted">' . $time . '</span>';
1329                 } else {
1330                         $link = $sk->linkKnown(
1331                                 $titleObj,
1332                                 $time,
1333                                 array(),
1334                                 array(
1335                                         'target' => $this->mTargetObj->getPrefixedText(),
1336                                         'timestamp' => $ts
1337                                 )
1338                         );
1339                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1340                                 $link = '<span class="history-deleted">' . $link . '</span>';
1341                         }
1342                         return $link;
1343                 }
1344         }
1345
1346         /**
1347          * Fetch image view link if it's available to all users
1348          *
1349          * @param $file File
1350          * @param $sk Skin
1351          * @return String: HTML fragment
1352          */
1353         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1354                 global $wgLang, $wgUser;
1355
1356                 if( !$file->userCan( File::DELETED_FILE ) ) {
1357                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1358                 } else {
1359                         $link = $sk->linkKnown(
1360                                 $titleObj,
1361                                 $wgLang->timeanddate( $ts, true ),
1362                                 array(),
1363                                 array(
1364                                         'target' => $this->mTargetObj->getPrefixedText(),
1365                                         'file' => $key,
1366                                         'token' => $wgUser->editToken( $key )
1367                                 )
1368                         );
1369                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1370                                 $link = '<span class="history-deleted">' . $link . '</span>';
1371                         }
1372                         return $link;
1373                 }
1374         }
1375
1376         /**
1377          * Fetch file's user id if it's available to this user
1378          *
1379          * @param $file File
1380          * @param $sk Skin
1381          * @return String: HTML fragment
1382          */
1383         function getFileUser( $file, $sk ) {
1384                 if( !$file->userCan( File::DELETED_USER ) ) {
1385                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1386                 } else {
1387                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1388                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1389                         if( $file->isDeleted( File::DELETED_USER ) ) {
1390                                 $link = '<span class="history-deleted">' . $link . '</span>';
1391                         }
1392                         return $link;
1393                 }
1394         }
1395
1396         /**
1397          * Fetch file upload comment if it's available to this user
1398          *
1399          * @param $file File
1400          * @param $sk Skin
1401          * @return String: HTML fragment
1402          */
1403         function getFileComment( $file, $sk ) {
1404                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1405                         return '<span class="history-deleted"><span class="comment">' .
1406                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1407                 } else {
1408                         $link = $sk->commentBlock( $file->getRawDescription() );
1409                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1410                                 $link = '<span class="history-deleted">' . $link . '</span>';
1411                         }
1412                         return $link;
1413                 }
1414         }
1415
1416         function undelete() {
1417                 global $wgOut, $wgUser;
1418                 if ( wfReadOnly() ) {
1419                         $wgOut->readOnlyPage();
1420                         return;
1421                 }
1422                 if( !is_null( $this->mTargetObj ) ) {
1423                         $archive = new PageArchive( $this->mTargetObj );
1424                         $ok = $archive->undelete(
1425                                 $this->mTargetTimestamp,
1426                                 $this->mComment,
1427                                 $this->mFileVersions,
1428                                 $this->mUnsuppress );
1429
1430                         if( is_array( $ok ) ) {
1431                                 if ( $ok[1] ) { // Undeleted file count
1432                                         wfRunHooks( 'FileUndeleteComplete', array(
1433                                                 $this->mTargetObj, $this->mFileVersions,
1434                                                 $wgUser, $this->mComment ) );
1435                                 }
1436
1437                                 $skin = $wgUser->getSkin();
1438                                 $link = $skin->linkKnown( $this->mTargetObj );
1439                                 $wgOut->addWikiMsgArray( 'undeletedpage', array( $link ), array( 'replaceafter' ) );
1440                         } else {
1441                                 $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1442                                 $wgOut->addWikiMsg( 'undeleterevdel' );
1443                         }
1444
1445                         // Show file deletion warnings and errors
1446                         $status = $archive->getFileStatus();
1447                         if( $status && !$status->isGood() ) {
1448                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1449                         }
1450                 } else {
1451                         $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1452                 }
1453                 return false;
1454         }
1455 }