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
  36         /**
  37          * @var Status
  38          */
  39         protected $fileStatus;
  40
  41         /**
  42          * @var Status
  43          */
  44         protected $revisionStatus;
  45
  46         function __construct( $title ) {
  47                 if( is_null( $title ) ) {
  48                         throw new MWException( __METHOD__ . ' given a null title.' );
  49                 }
  50                 $this->title = $title;
  51         }
  52
  53         /**
  54          * List all deleted pages recorded in the archive table. Returns result
  55          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  56          * namespace/title.
  57          *
  58          * @return ResultWrapper
  59          */
  60         public static function listAllPages() {
  61                 $dbr = wfGetDB( DB_SLAVE );
  62                 return self::listPages( $dbr, '' );
  63         }
  64
  65         /**
  66          * List deleted pages recorded in the archive table matching the
  67          * given title prefix.
  68          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  69          *
  70          * @param $prefix String: title prefix
  71          * @return ResultWrapper
  72          */
  73         public static function listPagesByPrefix( $prefix ) {
  74                 $dbr = wfGetDB( DB_SLAVE );
  75
  76                 $title = Title::newFromText( $prefix );
  77                 if( $title ) {
  78                         $ns = $title->getNamespace();
  79                         $prefix = $title->getDBkey();
  80                 } else {
  81                         // Prolly won't work too good
  82                         // @todo handle bare namespace names cleanly?
  83                         $ns = 0;
  84                 }
  85                 $conds = array(
  86                         'ar_namespace' => $ns,
  87                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  88                 );
  89                 return self::listPages( $dbr, $conds );
  90         }
  91
  92         /**
  93          * @param $dbr DatabaseBase
  94          * @param $condition
  95          * @return bool|ResultWrapper
  96          */
  97         protected static function listPages( $dbr, $condition ) {
  98                 return $dbr->resultObject(
  99                         $dbr->select(
 100                                 array( 'archive' ),
 101                                 array(
 102                                         'ar_namespace',
 103                                         'ar_title',
 104                                         'count' => 'COUNT(*)'
 105                                 ),
 106                                 $condition,
 107                                 __METHOD__,
 108                                 array(
 109                                         'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 110                                         'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 111                                         'LIMIT' => 100,
 112                                 )
 113                         )
 114                 );
 115         }
 116
 117         /**
 118          * List the revisions of the given page. Returns result wrapper with
 119          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 120          *
 121          * @return ResultWrapper
 122          */
 123         function listRevisions() {
 124                 global $wgContentHandlerUseDB;
 125
 126                 $dbr = wfGetDB( DB_SLAVE );
 127
 128                 $fields = array(
 129                         'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 130                         'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1',
 131                 );
 132
 133                 if ( $wgContentHandlerUseDB ) {
 134                         $fields[] = 'ar_content_format';
 135                         $fields[] = 'ar_content_model';
 136                 }
 137
 138                 $res = $dbr->select( 'archive',
 139                         $fields,
 140                         array( 'ar_namespace' => $this->title->getNamespace(),
 141                                    'ar_title' => $this->title->getDBkey() ),
 142                         __METHOD__,
 143                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 144                 $ret = $dbr->resultObject( $res );
 145                 return $ret;
 146         }
 147
 148         /**
 149          * List the deleted file revisions for this page, if it's a file page.
 150          * Returns a result wrapper with various filearchive fields, or null
 151          * if not a file page.
 152          *
 153          * @return ResultWrapper
 154          * @todo Does this belong in Image for fuller encapsulation?
 155          */
 156         function listFiles() {
 157                 if( $this->title->getNamespace() == NS_FILE ) {
 158                         $dbr = wfGetDB( DB_SLAVE );
 159                         $res = $dbr->select( 'filearchive',
 160                                 array(
 161                                         'fa_id',
 162                                         'fa_name',
 163                                         'fa_archive_name',
 164                                         'fa_storage_key',
 165                                         'fa_storage_group',
 166                                         'fa_size',
 167                                         'fa_width',
 168                                         'fa_height',
 169                                         'fa_bits',
 170                                         'fa_metadata',
 171                                         'fa_media_type',
 172                                         'fa_major_mime',
 173                                         'fa_minor_mime',
 174                                         'fa_description',
 175                                         'fa_user',
 176                                         'fa_user_text',
 177                                         'fa_timestamp',
 178                                         'fa_deleted',
 179                                         'fa_sha1' ),
 180                                 array( 'fa_name' => $this->title->getDBkey() ),
 181                                 __METHOD__,
 182                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 183                         $ret = $dbr->resultObject( $res );
 184                         return $ret;
 185                 }
 186                 return null;
 187         }
 188
 189         /**
 190          * Return a Revision object containing data for the deleted revision.
 191          * Note that the result *may* or *may not* have a null page ID.
 192          *
 193          * @param $timestamp String
 194          * @return Revision
 195          */
 196         function getRevision( $timestamp ) {
 197                 global $wgContentHandlerUseDB;
 198
 199                 $dbr = wfGetDB( DB_SLAVE );
 200
 201                 $fields = array(
 202                         'ar_rev_id',
 203                         'ar_text',
 204                         'ar_comment',
 205                         'ar_user',
 206                         'ar_user_text',
 207                         'ar_timestamp',
 208                         'ar_minor_edit',
 209                         'ar_flags',
 210                         'ar_text_id',
 211                         'ar_deleted',
 212                         'ar_len',
 213                         'ar_sha1',
 214                 );
 215
 216                 if ( $wgContentHandlerUseDB ) {
 217                         $fields[] = 'ar_content_format';
 218                         $fields[] = 'ar_content_model';
 219                 }
 220
 221                 $row = $dbr->selectRow( 'archive',
 222                         $fields,
 223                         array( 'ar_namespace' => $this->title->getNamespace(),
 224                                         'ar_title' => $this->title->getDBkey(),
 225                                         'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 226                         __METHOD__ );
 227                 if( $row ) {
 228                         return Revision::newFromArchiveRow( $row, array( 'title' => $this->title ) );
 229                 } else {
 230                         return null;
 231                 }
 232         }
 233
 234         /**
 235          * Return the most-previous revision, either live or deleted, against
 236          * the deleted revision given by timestamp.
 237          *
 238          * May produce unexpected results in case of history merges or other
 239          * unusual time issues.
 240          *
 241          * @param $timestamp String
 242          * @return Revision or null
 243          */
 244         function getPreviousRevision( $timestamp ) {
 245                 $dbr = wfGetDB( DB_SLAVE );
 246
 247                 // Check the previous deleted revision...
 248                 $row = $dbr->selectRow( 'archive',
 249                         'ar_timestamp',
 250                         array( 'ar_namespace' => $this->title->getNamespace(),
 251                                    'ar_title' => $this->title->getDBkey(),
 252                                    'ar_timestamp < ' .
 253                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 254                         __METHOD__,
 255                         array(
 256                                 'ORDER BY' => 'ar_timestamp DESC',
 257                                 'LIMIT' => 1 ) );
 258                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 259
 260                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 261                         array( 'rev_id', 'rev_timestamp' ),
 262                         array(
 263                                 'page_namespace' => $this->title->getNamespace(),
 264                                 'page_title' => $this->title->getDBkey(),
 265                                 'page_id = rev_page',
 266                                 'rev_timestamp < ' .
 267                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 268                         __METHOD__,
 269                         array(
 270                                 'ORDER BY' => 'rev_timestamp DESC',
 271                                 'LIMIT' => 1 ) );
 272                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 273                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 274
 275                 if( $prevLive && $prevLive > $prevDeleted ) {
 276                         // Most prior revision was live
 277                         return Revision::newFromId( $prevLiveId );
 278                 } elseif( $prevDeleted ) {
 279                         // Most prior revision was deleted
 280                         return $this->getRevision( $prevDeleted );
 281                 } else {
 282                         // No prior revision on this page.
 283                         return null;
 284                 }
 285         }
 286
 287         /**
 288          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 289          *
 290          * @param $row Object: database row
 291          * @return Revision
 292          */
 293         function getTextFromRow( $row ) {
 294                 if( is_null( $row->ar_text_id ) ) {
 295                         // An old row from MediaWiki 1.4 or previous.
 296                         // Text is embedded in this row in classic compression format.
 297                         return Revision::getRevisionText( $row, 'ar_' );
 298                 } else {
 299                         // New-style: keyed to the text storage backend.
 300                         $dbr = wfGetDB( DB_SLAVE );
 301                         $text = $dbr->selectRow( 'text',
 302                                 array( 'old_text', 'old_flags' ),
 303                                 array( 'old_id' => $row->ar_text_id ),
 304                                 __METHOD__ );
 305                         return Revision::getRevisionText( $text );
 306                 }
 307         }
 308
 309         /**
 310          * Fetch (and decompress if necessary) the stored text of the most
 311          * recently edited deleted revision of the page.
 312          *
 313          * If there are no archived revisions for the page, returns NULL.
 314          *
 315          * @return String
 316          */
 317         function getLastRevisionText() {
 318                 $dbr = wfGetDB( DB_SLAVE );
 319                 $row = $dbr->selectRow( 'archive',
 320                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 321                         array( 'ar_namespace' => $this->title->getNamespace(),
 322                                    'ar_title' => $this->title->getDBkey() ),
 323                         __METHOD__,
 324                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 325                 if( $row ) {
 326                         return $this->getTextFromRow( $row );
 327                 } else {
 328                         return null;
 329                 }
 330         }
 331
 332         /**
 333          * Quick check if any archived revisions are present for the page.
 334          *
 335          * @return Boolean
 336          */
 337         function isDeleted() {
 338                 $dbr = wfGetDB( DB_SLAVE );
 339                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 340                         array( 'ar_namespace' => $this->title->getNamespace(),
 341                                    'ar_title' => $this->title->getDBkey() ),
 342                         __METHOD__
 343                 );
 344                 return ( $n > 0 );
 345         }
 346
 347         /**
 348          * Restore the given (or all) text and file revisions for the page.
 349          * Once restored, the items will be removed from the archive tables.
 350          * The deletion log will be updated with an undeletion notice.
 351          *
 352          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 353          * @param $comment String
 354          * @param $fileVersions Array
 355          * @param $unsuppress Boolean
 356          * @param $user User doing the action, or null to use $wgUser
 357          *
 358          * @return array(number of file revisions restored, number of image revisions restored, log message)
 359          * on success, false on failure
 360          */
 361         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false, User $user = null ) {
 362                 // If both the set of text revisions and file revisions are empty,
 363                 // restore everything. Otherwise, just restore the requested items.
 364                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 365
 366                 $restoreText = $restoreAll || !empty( $timestamps );
 367                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 368
 369                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 370                         $img = wfLocalFile( $this->title );
 371                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 372                         if ( !$this->fileStatus->isOK() ) {
 373                                 return false;
 374                         }
 375                         $filesRestored = $this->fileStatus->successCount;
 376                 } else {
 377                         $filesRestored = 0;
 378                 }
 379
 380                 if( $restoreText ) {
 381                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 382                         if( !$this->revisionStatus->isOK() ) {
 383                                 return false;
 384                         }
 385
 386                         $textRestored = $this->revisionStatus->getValue();
 387                 } else {
 388                         $textRestored = 0;
 389                 }
 390
 391                 // Touch the log!
 392
 393                 if( $textRestored && $filesRestored ) {
 394                         $reason = wfMessage( 'undeletedrevisions-files' )
 395                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 396                 } elseif( $textRestored ) {
 397                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 398                                 ->inContentLanguage()->text();
 399                 } elseif( $filesRestored ) {
 400                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 401                                 ->inContentLanguage()->text();
 402                 } else {
 403                         wfDebug( "Undelete: nothing undeleted...\n" );
 404                         return false;
 405                 }
 406
 407                 if( trim( $comment ) != '' ) {
 408                         $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
 409                 }
 410
 411                 if ( $user === null ) {
 412                         global $wgUser;
 413                         $user = $wgUser;
 414                 }
 415
 416                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 417                 $logEntry->setPerformer( $user );
 418                 $logEntry->setTarget( $this->title );
 419                 $logEntry->setComment( $reason );
 420                 $logid = $logEntry->insert();
 421                 $logEntry->publish( $logid );
 422
 423                 return array( $textRestored, $filesRestored, $reason );
 424         }
 425
 426         /**
 427          * This is the meaty bit -- restores archived revisions of the given page
 428          * to the cur/old tables. If the page currently exists, all revisions will
 429          * be stuffed into old, otherwise the most recent will go into cur.
 430          *
 431          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 432          * @param $comment String
 433          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 434          *
 435          * @return Status, containing the number of revisions restored on success
 436          */
 437         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 438                 global $wgContentHandlerUseDB;
 439
 440                 if ( wfReadOnly() ) {
 441                         throw new ReadOnlyError();
 442                 }
 443                 $restoreAll = empty( $timestamps );
 444
 445                 $dbw = wfGetDB( DB_MASTER );
 446
 447                 # Does this page already exist? We'll have to update it...
 448                 $article = WikiPage::factory( $this->title );
 449                 # Load latest data for the current page (bug 31179)
 450                 $article->loadPageData( 'fromdbmaster' );
 451                 $oldcountable = $article->isCountable();
 452
 453                 $page = $dbw->selectRow( 'page',
 454                         array( 'page_id', 'page_latest' ),
 455                         array( 'page_namespace' => $this->title->getNamespace(),
 456                                    'page_title'     => $this->title->getDBkey() ),
 457                         __METHOD__,
 458                         array( 'FOR UPDATE' ) // lock page
 459                 );
 460                 if( $page ) {
 461                         $makepage = false;
 462                         # Page already exists. Import the history, and if necessary
 463                         # we'll update the latest revision field in the record.
 464                         $newid             = 0;
 465                         $pageId            = $page->page_id;
 466                         $previousRevId    = $page->page_latest;
 467                         # Get the time span of this page
 468                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 469                                 array( 'rev_id' => $previousRevId ),
 470                                 __METHOD__ );
 471
 472                         if( $previousTimestamp === false ) {
 473                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 474
 475                                 $status = Status::newGood( 0 );
 476                                 $status->warning( 'undeleterevision-missing' );
 477
 478                                 return $status;
 479                         }
 480                 } else {
 481                         # Have to create a new article...
 482                         $makepage = true;
 483                         $previousRevId = 0;
 484                         $previousTimestamp = 0;
 485                 }
 486
 487                 if( $restoreAll ) {
 488                         $oldones = '1 = 1'; # All revisions...
 489                 } else {
 490                         $oldts = implode( ',',
 491                                 array_map( array( &$dbw, 'addQuotes' ),
 492                                         array_map( array( &$dbw, 'timestamp' ),
 493                                                 $timestamps ) ) );
 494
 495                         $oldones = "ar_timestamp IN ( {$oldts} )";
 496                 }
 497
 498                 $fields = array(
 499                         'ar_rev_id',
 500                         'ar_text',
 501                         'ar_comment',
 502                         'ar_user',
 503                         'ar_user_text',
 504                         'ar_timestamp',
 505                         'ar_minor_edit',
 506                         'ar_flags',
 507                         'ar_text_id',
 508                         'ar_deleted',
 509                         'ar_page_id',
 510                         'ar_len',
 511                         'ar_sha1');
 512
 513                 if ( $wgContentHandlerUseDB ) {
 514                         $fields[] = 'ar_content_format';
 515                         $fields[] = 'ar_content_model';
 516                 }
 517
 518                 /**
 519                  * Select each archived revision...
 520                  */
 521                 $result = $dbw->select( 'archive',
 522                         $fields,
 523                         /* WHERE */ array(
 524                                 'ar_namespace' => $this->title->getNamespace(),
 525                                 'ar_title'     => $this->title->getDBkey(),
 526                                 $oldones ),
 527                         __METHOD__,
 528                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 529                 );
 530                 $ret = $dbw->resultObject( $result );
 531                 $rev_count = $dbw->numRows( $result );
 532                 if( !$rev_count ) {
 533                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 534
 535                         $status = Status::newGood( 0 );
 536                         $status->warning( "undelete-no-results" );
 537                         return $status;
 538                 }
 539
 540                 $ret->seek( $rev_count - 1 ); // move to last
 541                 $row = $ret->fetchObject(); // get newest archived rev
 542                 $ret->seek( 0 ); // move back
 543
 544                 // grab the content to check consistency with global state before restoring the page.
 545                 $revision = Revision::newFromArchiveRow( $row,
 546                         array(
 547                                 'title' => $article->getTitle(), // used to derive default content model
 548                         ) );
 549
 550                 $m = $revision->getContentModel();
 551
 552                 $user = User::newFromName( $revision->getRawUserText(), false );
 553                 $content = $revision->getContent( Revision::RAW );
 554
 555                 //NOTE: article ID may not be known yet. prepareSave() should not modify the database.
 556                 $status = $content->prepareSave( $article, 0, -1, $user );
 557
 558                 if ( !$status->isOK() ) {
 559                         return $status;
 560                 }
 561
 562                 if( $makepage ) {
 563                         // Check the state of the newest to-be version...
 564                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 565                                 return Status::newFatal( "undeleterevdel" );
 566                         }
 567                         // Safe to insert now...
 568                         $newid  = $article->insertOn( $dbw );
 569                         $pageId = $newid;
 570                 } else {
 571                         // Check if a deleted revision will become the current revision...
 572                         if( $row->ar_timestamp > $previousTimestamp ) {
 573                                 // Check the state of the newest to-be version...
 574                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 575                                         return Status::newFatal( "undeleterevdel" );
 576                                 }
 577                         }
 578                 }
 579
 580                 $revision = null;
 581                 $restored = 0;
 582
 583                 foreach ( $ret as $row ) {
 584                         // Check for key dupes due to shitty archive integrity.
 585                         if( $row->ar_rev_id ) {
 586                                 $exists = $dbw->selectField( 'revision', '1',
 587                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 588                                 if( $exists ) {
 589                                         continue; // don't throw DB errors
 590                                 }
 591                         }
 592                         // Insert one revision at a time...maintaining deletion status
 593                         // unless we are specifically removing all restrictions...
 594                         $revision = Revision::newFromArchiveRow( $row,
 595                                 array(
 596                                         'title' => $this->title,
 597                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 598                                 ) );
 599
 600                         $revision->insertOn( $dbw );
 601                         $restored++;
 602
 603                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 604                 }
 605                 # Now that it's safely stored, take it out of the archive
 606                 $dbw->delete( 'archive',
 607                         /* WHERE */ array(
 608                                 'ar_namespace' => $this->title->getNamespace(),
 609                                 'ar_title' => $this->title->getDBkey(),
 610                                 $oldones ),
 611                         __METHOD__ );
 612
 613                 // Was anything restored at all?
 614                 if ( $restored == 0 ) {
 615                         return Status::newGood( 0 );
 616                 }
 617
 618                 $created = (bool)$newid;
 619
 620                 // Attach the latest revision to the page...
 621                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 622                 if ( $created || $wasnew ) {
 623                         // Update site stats, link tables, etc
 624                         $user = User::newFromName( $revision->getRawUserText(), false );
 625                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 626                 }
 627
 628                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 629
 630                 if( $this->title->getNamespace() == NS_FILE ) {
 631                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 632                         $update->doUpdate();
 633                 }
 634
 635                 return Status::newGood( $restored );
 636         }
 637
 638         /**
 639          * @return Status
 640          */
 641         function getFileStatus() { return $this->fileStatus; }
 642
 643         /**
 644          * @return Status
 645          */
 646         function getRevisionStatus() { return $this->revisionStatus; }
 647 }
 648
 649 /**
 650  * Special page allowing users with the appropriate permissions to view
 651  * and restore deleted content.
 652  *
 653  * @ingroup SpecialPage
 654  */
 655 class SpecialUndelete extends SpecialPage {
 656         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 657         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 658
 659         /**
 660          * @var Title
 661          */
 662         var $mTargetObj;
 663
 664         function __construct() {
 665                 parent::__construct( 'Undelete', 'deletedhistory' );
 666         }
 667
 668         function loadRequest( $par ) {
 669                 $request = $this->getRequest();
 670                 $user = $this->getUser();
 671
 672                 $this->mAction = $request->getVal( 'action' );
 673                 if ( $par !== null && $par !== '' ) {
 674                         $this->mTarget = $par;
 675                 } else {
 676                         $this->mTarget = $request->getVal( 'target' );
 677                 }
 678                 $this->mTargetObj = null;
 679                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 680                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 681                 }
 682                 $this->mSearchPrefix = $request->getText( 'prefix' );
 683                 $time = $request->getVal( 'timestamp' );
 684                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 685                 $this->mFilename = $request->getVal( 'file' );
 686
 687                 $posted = $request->wasPosted() &&
 688                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 689                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 690                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 691                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 692                 $this->mDiff = $request->getCheck( 'diff' );
 693                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 694                 $this->mComment = $request->getText( 'wpComment' );
 695                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 696                 $this->mToken = $request->getVal( 'token' );
 697
 698                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 699                         $this->mAllowed = true; // user can restore
 700                         $this->mCanView = true; // user can view content
 701                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 702                         $this->mAllowed = false; // user cannot restore
 703                         $this->mCanView = true; // user can view content
 704                         $this->mRestore = false;
 705                 } else { // user can only view the list of revisions
 706                         $this->mAllowed = false;
 707                         $this->mCanView = false;
 708                         $this->mTimestamp = '';
 709                         $this->mRestore = false;
 710                 }
 711
 712                 if( $this->mRestore || $this->mInvert ) {
 713                         $timestamps = array();
 714                         $this->mFileVersions = array();
 715                         foreach( $request->getValues() as $key => $val ) {
 716                                 $matches = array();
 717                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 718                                         array_push( $timestamps, $matches[1] );
 719                                 }
 720
 721                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 722                                         $this->mFileVersions[] = intval( $matches[1] );
 723                                 }
 724                         }
 725                         rsort( $timestamps );
 726                         $this->mTargetTimestamp = $timestamps;
 727                 }
 728         }
 729
 730         function execute( $par ) {
 731                 $this->checkPermissions();
 732                 $user = $this->getUser();
 733
 734                 $this->setHeaders();
 735                 $this->outputHeader();
 736
 737                 $this->loadRequest( $par );
 738
 739                 $out = $this->getOutput();
 740
 741                 if ( is_null( $this->mTargetObj ) ) {
 742                         $out->addWikiMsg( 'undelete-header' );
 743
 744                         # Not all users can just browse every deleted page from the list
 745                         if ( $user->isAllowed( 'browsearchive' ) ) {
 746                                 $this->showSearchForm();
 747                         }
 748                         return;
 749                 }
 750
 751                 if ( $this->mAllowed ) {
 752                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 753                 } else {
 754                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 755                 }
 756
 757                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 758
 759                 if ( $this->mTimestamp !== '' ) {
 760                         $this->showRevision( $this->mTimestamp );
 761                 } elseif ( $this->mFilename !== null ) {
 762                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 763                         // Check if user is allowed to see this file
 764                         if ( !$file->exists() ) {
 765                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 766                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 767                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 768                                         throw new PermissionsError( 'suppressrevision' );
 769                                 } else {
 770                                         throw new PermissionsError( 'deletedtext' );
 771                                 }
 772                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 773                                 $this->showFileConfirmationForm( $this->mFilename );
 774                         } else {
 775                                 $this->showFile( $this->mFilename );
 776                         }
 777                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 778                         $this->undelete();
 779                 } else {
 780                         $this->showHistory();
 781                 }
 782         }
 783
 784         function showSearchForm() {
 785                 global $wgScript;
 786
 787                 $out = $this->getOutput();
 788                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 789                 $out->addHTML(
 790                         Xml::openElement( 'form', array(
 791                                 'method' => 'get',
 792                                 'action' => $wgScript ) ) .
 793                         Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 794                         Html::hidden( 'title',
 795                                 $this->getTitle()->getPrefixedDbKey() ) .
 796                         Xml::inputLabel( $this->msg( 'undelete-search-prefix' )->text(),
 797                                 'prefix', 'prefix', 20,
 798                                 $this->mSearchPrefix ) . ' ' .
 799                         Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 800                         Xml::closeElement( 'fieldset' ) .
 801                         Xml::closeElement( 'form' )
 802                 );
 803
 804                 # List undeletable articles
 805                 if( $this->mSearchPrefix ) {
 806                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 807                         $this->showList( $result );
 808                 }
 809         }
 810
 811         /**
 812          * Generic list of deleted pages
 813          *
 814          * @param $result ResultWrapper
 815          * @return bool
 816          */
 817         private function showList( $result ) {
 818                 $out = $this->getOutput();
 819
 820                 if( $result->numRows() == 0 ) {
 821                         $out->addWikiMsg( 'undelete-no-results' );
 822                         return;
 823                 }
 824
 825                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 826
 827                 $undelete = $this->getTitle();
 828                 $out->addHTML( "<ul>\n" );
 829                 foreach ( $result as $row ) {
 830                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 831                         if ( $title !== null ) {
 832                                 $item = Linker::linkKnown(
 833                                         $undelete,
 834                                         htmlspecialchars( $title->getPrefixedText() ),
 835                                         array(),
 836                                         array( 'target' => $title->getPrefixedText() )
 837                                 );
 838                         } else {
 839                                 // The title is no longer valid, show as text
 840                                 $item = Html::element( 'span', array( 'class' => 'mw-invalidtitle' ),
 841                                         Linker::getInvalidTitleDescription( $this->getContext(), $row->ar_namespace, $row->ar_title ) );
 842                         }
 843                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 844                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 845                 }
 846                 $result->free();
 847                 $out->addHTML( "</ul>\n" );
 848
 849                 return true;
 850         }
 851
 852         private function showRevision( $timestamp ) {
 853                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 854                         return;
 855                 }
 856
 857                 $archive = new PageArchive( $this->mTargetObj );
 858                 if ( !wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) ) ) {
 859                         return;
 860                 }
 861                 $rev = $archive->getRevision( $timestamp );
 862
 863                 $out = $this->getOutput();
 864                 $user = $this->getUser();
 865
 866                 if( !$rev ) {
 867                         $out->addWikiMsg( 'undeleterevision-missing' );
 868                         return;
 869                 }
 870
 871                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 872                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 873                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 874                                 return;
 875                         } else {
 876                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 877                                 $out->addHTML( '<br />' );
 878                                 // and we are allowed to see...
 879                         }
 880                 }
 881
 882                 if( $this->mDiff ) {
 883                         $previousRev = $archive->getPreviousRevision( $timestamp );
 884                         if( $previousRev ) {
 885                                 $this->showDiff( $previousRev, $rev );
 886                                 if( $this->mDiffOnly ) {
 887                                         return;
 888                                 } else {
 889                                         $out->addHTML( '<hr />' );
 890                                 }
 891                         } else {
 892                                 $out->addWikiMsg( 'undelete-nodiff' );
 893                         }
 894                 }
 895
 896                 $link = Linker::linkKnown(
 897                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 898                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 899                 );
 900
 901                 $lang = $this->getLanguage();
 902
 903                 // date and time are separate parameters to facilitate localisation.
 904                 // $time is kept for backward compat reasons.
 905                 $time = $lang->userTimeAndDate( $timestamp, $user );
 906                 $d = $lang->userDate( $timestamp, $user );
 907                 $t = $lang->userTime( $timestamp, $user );
 908                 $userLink = Linker::revUserTools( $rev );
 909
 910                 $content = $rev->getContent( Revision::FOR_THIS_USER, $user );
 911
 912                 $isText = ( $content instanceof TextContent );
 913
 914                 if( $this->mPreview || $isText ) {
 915                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 916                 } else {
 917                         $openDiv = '<div id="mw-undelete-revision">';
 918                 }
 919                 $out->addHTML( $openDiv );
 920
 921                 // Revision delete links
 922                 if ( !$this->mDiff ) {
 923                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 924                         if ( $revdel ) {
 925                                 $out->addHTML( "$revdel " );
 926                         }
 927                 }
 928
 929                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 930                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 931
 932                 if ( !wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) ) ) {
 933                         return;
 934                 }
 935
 936                 if( $this->mPreview || !$isText ) {
 937                         // NOTE: non-text content has no source view, so always use rendered preview
 938
 939                         // Hide [edit]s
 940                         $popts = $out->parserOptions();
 941                         $popts->setEditSection( false );
 942
 943                         $pout = $content->getParserOutput( $this->mTargetObj, $rev->getId(), $popts, true );
 944                         $out->addParserOutput( $pout );
 945                 }
 946
 947                 if ( $isText ) {
 948                         // source view for textual content
 949                         $sourceView = Xml::element( 'textarea', array(
 950                                 'readonly' => 'readonly',
 951                                 'cols' => intval( $user->getOption( 'cols' ) ),
 952                                 'rows' => intval( $user->getOption( 'rows' ) ) ),
 953                                 $content->getNativeData() . "\n" );
 954
 955                         $previewButton = Xml::element( 'input', array(
 956                                 'type' => 'submit',
 957                                 'name' => 'preview',
 958                                 'value' => $this->msg( 'showpreview' )->text() ) );
 959                 } else {
 960                         $sourceView = '';
 961                         $previewButton = '';
 962                 }
 963
 964                 $diffButton = Xml::element( 'input', array(
 965                         'name' => 'diff',
 966                         'type' => 'submit',
 967                         'value' => $this->msg( 'showdiff' )->text() ) );
 968
 969                 $out->addHTML(
 970                         $sourceView .
 971                         Xml::openElement( 'div', array(
 972                                 'style' => 'clear: both' ) ) .
 973                         Xml::openElement( 'form', array(
 974                                 'method' => 'post',
 975                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 976                         Xml::element( 'input', array(
 977                                 'type' => 'hidden',
 978                                 'name' => 'target',
 979                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 980                         Xml::element( 'input', array(
 981                                 'type' => 'hidden',
 982                                 'name' => 'timestamp',
 983                                 'value' => $timestamp ) ) .
 984                         Xml::element( 'input', array(
 985                                 'type' => 'hidden',
 986                                 'name' => 'wpEditToken',
 987                                 'value' => $user->getEditToken() ) ) .
 988                         $previewButton .
 989                         $diffButton .
 990                         Xml::closeElement( 'form' ) .
 991                         Xml::closeElement( 'div' ) );
 992         }
 993
 994         /**
 995          * Build a diff display between this and the previous either deleted
 996          * or non-deleted edit.
 997          *
 998          * @param $previousRev Revision
 999          * @param $currentRev Revision
1000          * @return String: HTML
1001          */
1002         function showDiff( $previousRev, $currentRev ) {
1003                 $diffContext = clone $this->getContext();
1004                 $diffContext->setTitle( $currentRev->getTitle() );
1005                 $diffContext->setWikiPage( WikiPage::factory( $currentRev->getTitle() ) );
1006
1007                 $diffEngine = $currentRev->getContentHandler()->createDifferenceEngine( $diffContext );
1008                 $diffEngine->showDiffStyle();
1009                 $this->getOutput()->addHTML(
1010                         "<div>" .
1011                         "<table style='width: 98%;' cellpadding='0' cellspacing='4' class='diff'>" .
1012                         "<col class='diff-marker' />" .
1013                         "<col class='diff-content' />" .
1014                         "<col class='diff-marker' />" .
1015                         "<col class='diff-content' />" .
1016                         "<tr>" .
1017                                 "<td colspan='2' style='width: 50%; text-align: center' class='diff-otitle'>" .
1018                                 $this->diffHeader( $previousRev, 'o' ) .
1019                                 "</td>\n" .
1020                                 "<td colspan='2' style='width: 50%;  text-align: center' class='diff-ntitle'>" .
1021                                 $this->diffHeader( $currentRev, 'n' ) .
1022                                 "</td>\n" .
1023                         "</tr>" .
1024                         $diffEngine->generateContentDiffBody(
1025                                 $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
1026                                 $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ) ) .
1027                         "</table>" .
1028                         "</div>\n"
1029                 );
1030         }
1031
1032         /**
1033          * @param $rev Revision
1034          * @param $prefix
1035          * @return string
1036          */
1037         private function diffHeader( $rev, $prefix ) {
1038                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
1039                 if( $isDeleted ) {
1040                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
1041                         $targetPage = $this->getTitle();
1042                         $targetQuery = array(
1043                                 'target' => $this->mTargetObj->getPrefixedText(),
1044                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
1045                         );
1046                 } else {
1047                         /// @todo FIXME: getId() may return non-zero for deleted revs...
1048                         $targetPage = $rev->getTitle();
1049                         $targetQuery = array( 'oldid' => $rev->getId() );
1050                 }
1051                 // Add show/hide deletion links if available
1052                 $user = $this->getUser();
1053                 $lang = $this->getLanguage();
1054                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1055                 if ( $rdel ) $rdel = " $rdel";
1056                 return
1057                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1058                                 Linker::link(
1059                                         $targetPage,
1060                                         $this->msg(
1061                                                 'revisionasof',
1062                                                 $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
1063                                                 $lang->userDate( $rev->getTimestamp(), $user ),
1064                                                 $lang->userTime( $rev->getTimestamp(), $user )
1065                                         )->escaped(),
1066                                         array(),
1067                                         $targetQuery
1068                                 ) .
1069                         '</strong></div>' .
1070                         '<div id="mw-diff-'.$prefix.'title2">' .
1071                                 Linker::revUserTools( $rev ) . '<br />' .
1072                         '</div>' .
1073                         '<div id="mw-diff-'.$prefix.'title3">' .
1074                                 Linker::revComment( $rev ) . $rdel . '<br />' .
1075                         '</div>';
1076         }
1077
1078         /**
1079          * Show a form confirming whether a tokenless user really wants to see a file
1080          */
1081         private function showFileConfirmationForm( $key ) {
1082                 $out = $this->getOutput();
1083                 $lang = $this->getLanguage();
1084                 $user = $this->getUser();
1085                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1086                 $out->addWikiMsg( 'undelete-show-file-confirm',
1087                         $this->mTargetObj->getText(),
1088                         $lang->userDate( $file->getTimestamp(), $user ),
1089                         $lang->userTime( $file->getTimestamp(), $user ) );
1090                 $out->addHTML(
1091                         Xml::openElement( 'form', array(
1092                                 'method' => 'POST',
1093                                 'action' => $this->getTitle()->getLocalURL(
1094                                         'target=' . urlencode( $this->mTarget ) .
1095                                         '&file=' . urlencode( $key ) .
1096                                         '&token=' . urlencode( $user->getEditToken( $key ) ) )
1097                                 )
1098                         ) .
1099                         Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1100                         '</form>'
1101                 );
1102         }
1103
1104         /**
1105          * Show a deleted file version requested by the visitor.
1106          */
1107         private function showFile( $key ) {
1108                 $this->getOutput()->disable();
1109
1110                 # We mustn't allow the output to be Squid cached, otherwise
1111                 # if an admin previews a deleted image, and it's cached, then
1112                 # a user without appropriate permissions can toddle off and
1113                 # nab the image, and Squid will serve it
1114                 $response = $this->getRequest()->response();
1115                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1116                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1117                 $response->header( 'Pragma: no-cache' );
1118
1119                 $repo = RepoGroup::singleton()->getLocalRepo();
1120                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1121                 $repo->streamFile( $path );
1122         }
1123
1124         private function showHistory() {
1125                 $out = $this->getOutput();
1126                 if( $this->mAllowed ) {
1127                         $out->addModules( 'mediawiki.special.undelete' );
1128                 }
1129                 $out->wrapWikiMsg(
1130                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1131                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1132                 );
1133
1134                 $archive = new PageArchive( $this->mTargetObj );
1135                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1136                 /*
1137                 $text = $archive->getLastRevisionText();
1138                 if( is_null( $text ) ) {
1139                         $out->addWikiMsg( 'nohistory' );
1140                         return;
1141                 }
1142                 */
1143                 $out->addHTML( '<div class="mw-undelete-history">' );
1144                 if ( $this->mAllowed ) {
1145                         $out->addWikiMsg( 'undeletehistory' );
1146                         $out->addWikiMsg( 'undeleterevdel' );
1147                 } else {
1148                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1149                 }
1150                 $out->addHTML( '</div>' );
1151
1152                 # List all stored revisions
1153                 $revisions = $archive->listRevisions();
1154                 $files = $archive->listFiles();
1155
1156                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1157                 $haveFiles = $files && $files->numRows() > 0;
1158
1159                 # Batch existence check on user and talk pages
1160                 if( $haveRevisions ) {
1161                         $batch = new LinkBatch();
1162                         foreach ( $revisions as $row ) {
1163                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1164                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1165                         }
1166                         $batch->execute();
1167                         $revisions->seek( 0 );
1168                 }
1169                 if( $haveFiles ) {
1170                         $batch = new LinkBatch();
1171                         foreach ( $files as $row ) {
1172                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1173                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1174                         }
1175                         $batch->execute();
1176                         $files->seek( 0 );
1177                 }
1178
1179                 if ( $this->mAllowed ) {
1180                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1181                         # Start the form here
1182                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1183                         $out->addHTML( $top );
1184                 }
1185
1186                 # Show relevant lines from the deletion log:
1187                 $deleteLogPage = new LogPage( 'delete' );
1188                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1189                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1190                 # Show relevant lines from the suppression log:
1191                 $suppressLogPage = new LogPage( 'suppress' );
1192                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1193                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1194                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1195                 }
1196
1197                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1198                         # Format the user-visible controls (comment field, submission button)
1199                         # in a nice little table
1200                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1201                                 $unsuppressBox =
1202                                         "<tr>
1203                                                 <td>&#160;</td>
1204                                                 <td class='mw-input'>" .
1205                                                         Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1206                                                                 'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ).
1207                                                 "</td>
1208                                         </tr>";
1209                         } else {
1210                                 $unsuppressBox = '';
1211                         }
1212                         $table =
1213                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1214                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1215                                         "<tr>
1216                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1217                                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1218                                                 "</td>
1219                                         </tr>
1220                                         <tr>
1221                                                 <td class='mw-label'>" .
1222                                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1223                                                 "</td>
1224                                                 <td class='mw-input'>" .
1225                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1226                                                 "</td>
1227                                         </tr>
1228                                         <tr>
1229                                                 <td>&#160;</td>
1230                                                 <td class='mw-submit'>" .
1231                                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1232                                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1233                                                 "</td>
1234                                         </tr>" .
1235                                         $unsuppressBox .
1236                                 Xml::closeElement( 'table' ) .
1237                                 Xml::closeElement( 'fieldset' );
1238
1239                         $out->addHTML( $table );
1240                 }
1241
1242                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1243
1244                 if( $haveRevisions ) {
1245                         # The page's stored (deleted) history:
1246                         $out->addHTML( '<ul>' );
1247                         $remaining = $revisions->numRows();
1248                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1249
1250                         foreach ( $revisions as $row ) {
1251                                 $remaining--;
1252                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1253                         }
1254                         $revisions->free();
1255                         $out->addHTML( '</ul>' );
1256                 } else {
1257                         $out->addWikiMsg( 'nohistory' );
1258                 }
1259
1260                 if( $haveFiles ) {
1261                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1262                         $out->addHTML( '<ul>' );
1263                         foreach ( $files as $row ) {
1264                                 $out->addHTML( $this->formatFileRow( $row ) );
1265                         }
1266                         $files->free();
1267                         $out->addHTML( '</ul>' );
1268                 }
1269
1270                 if ( $this->mAllowed ) {
1271                         # Slip in the hidden controls here
1272                         $misc  = Html::hidden( 'target', $this->mTarget );
1273                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1274                         $misc .= Xml::closeElement( 'form' );
1275                         $out->addHTML( $misc );
1276                 }
1277
1278                 return true;
1279         }
1280
1281         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1282                 $rev = Revision::newFromArchiveRow( $row,
1283                         array(
1284                                 'title' => $this->mTargetObj
1285                         ) );
1286
1287                 $revTextSize = '';
1288                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1289                 // Build checkboxen...
1290                 if( $this->mAllowed ) {
1291                         if( $this->mInvert ) {
1292                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1293                                         $checkBox = Xml::check( "ts$ts" );
1294                                 } else {
1295                                         $checkBox = Xml::check( "ts$ts", true );
1296                                 }
1297                         } else {
1298                                 $checkBox = Xml::check( "ts$ts" );
1299                         }
1300                 } else {
1301                         $checkBox = '';
1302                 }
1303                 $user = $this->getUser();
1304                 // Build page & diff links...
1305                 if( $this->mCanView ) {
1306                         $titleObj = $this->getTitle();
1307                         # Last link
1308                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1309                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1310                                 $last = $this->msg( 'diff' )->escaped();
1311                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1312                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1313                                 $last = Linker::linkKnown(
1314                                         $titleObj,
1315                                         $this->msg( 'diff' )->escaped(),
1316                                         array(),
1317                                         array(
1318                                                 'target' => $this->mTargetObj->getPrefixedText(),
1319                                                 'timestamp' => $ts,
1320                                                 'diff' => 'prev'
1321                                         )
1322                                 );
1323                         } else {
1324                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1325                                 $last = $this->msg( 'diff' )->escaped();
1326                         }
1327                 } else {
1328                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1329                         $last = $this->msg( 'diff' )->escaped();
1330                 }
1331                 // User links
1332                 $userLink = Linker::revUserTools( $rev );
1333                 // Revision text size
1334                 $size = $row->ar_len;
1335                 if( !is_null( $size ) ) {
1336                         $revTextSize = Linker::formatRevisionSize( $size );
1337                 }
1338                 // Edit summary
1339                 $comment = Linker::revComment( $rev );
1340                 // Revision delete links
1341                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1342
1343                 $revisionRow = $this->msg( 'undelete-revisionrow' )->rawParams( $checkBox, $revdlink, $last, $pageLink , $userLink, $revTextSize, $comment )->escaped();
1344                 return "<li>$revisionRow</li>";
1345         }
1346
1347         private function formatFileRow( $row ) {
1348                 $file = ArchivedFile::newFromRow( $row );
1349
1350                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1351                 $user = $this->getUser();
1352                 if( $this->mAllowed && $row->fa_storage_key ) {
1353                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1354                         $key = urlencode( $row->fa_storage_key );
1355                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1356                 } else {
1357                         $checkBox = '';
1358                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1359                 }
1360                 $userLink = $this->getFileUser( $file );
1361                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1362                 $bytes = $this->msg( 'parentheses' )->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )->plain();
1363                 $data = htmlspecialchars( $data . ' ' . $bytes );
1364                 $comment = $this->getFileComment( $file );
1365
1366                 // Add show/hide deletion links if available
1367                 $canHide = $user->isAllowed( 'deleterevision' );
1368                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1369                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1370                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1371                         } else {
1372                                 $query = array(
1373                                         'type' => 'filearchive',
1374                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1375                                         'ids' => $row->fa_id
1376                                 );
1377                                 $revdlink = Linker::revDeleteLink( $query,
1378                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1379                         }
1380                 } else {
1381                         $revdlink = '';
1382                 }
1383
1384                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1385         }
1386
1387         /**
1388          * Fetch revision text link if it's available to all users
1389          *
1390          * @param $rev Revision
1391          * @param $titleObj Title
1392          * @param $ts string Timestamp
1393          * @return string
1394          */
1395         function getPageLink( $rev, $titleObj, $ts ) {
1396                 $user = $this->getUser();
1397                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1398
1399                 if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1400                         return '<span class="history-deleted">' . $time . '</span>';
1401                 } else {
1402                         $link = Linker::linkKnown(
1403                                 $titleObj,
1404                                 htmlspecialchars( $time ),
1405                                 array(),
1406                                 array(
1407                                         'target' => $this->mTargetObj->getPrefixedText(),
1408                                         'timestamp' => $ts
1409                                 )
1410                         );
1411                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1412                                 $link = '<span class="history-deleted">' . $link . '</span>';
1413                         }
1414                         return $link;
1415                 }
1416         }
1417
1418         /**
1419          * Fetch image view link if it's available to all users
1420          *
1421          * @param $file File
1422          * @param $titleObj Title
1423          * @param $ts string A timestamp
1424          * @param $key String: a storage key
1425          *
1426          * @return String: HTML fragment
1427          */
1428         function getFileLink( $file, $titleObj, $ts, $key ) {
1429                 $user = $this->getUser();
1430                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1431
1432                 if( !$file->userCan( File::DELETED_FILE, $user ) ) {
1433                         return '<span class="history-deleted">' . $time . '</span>';
1434                 } else {
1435                         $link = Linker::linkKnown(
1436                                 $titleObj,
1437                                 htmlspecialchars( $time ),
1438                                 array(),
1439                                 array(
1440                                         'target' => $this->mTargetObj->getPrefixedText(),
1441                                         'file' => $key,
1442                                         'token' => $user->getEditToken( $key )
1443                                 )
1444                         );
1445                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1446                                 $link = '<span class="history-deleted">' . $link . '</span>';
1447                         }
1448                         return $link;
1449                 }
1450         }
1451
1452         /**
1453          * Fetch file's user id if it's available to this user
1454          *
1455          * @param $file File
1456          * @return String: HTML fragment
1457          */
1458         function getFileUser( $file ) {
1459                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1460                         return '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1461                 } else {
1462                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1463                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1464                         if( $file->isDeleted( File::DELETED_USER ) ) {
1465                                 $link = '<span class="history-deleted">' . $link . '</span>';
1466                         }
1467                         return $link;
1468                 }
1469         }
1470
1471         /**
1472          * Fetch file upload comment if it's available to this user
1473          *
1474          * @param $file File
1475          * @return String: HTML fragment
1476          */
1477         function getFileComment( $file ) {
1478                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1479                         return '<span class="history-deleted"><span class="comment">' .
1480                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1481                 } else {
1482                         $link = Linker::commentBlock( $file->getRawDescription() );
1483                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1484                                 $link = '<span class="history-deleted">' . $link . '</span>';
1485                         }
1486                         return $link;
1487                 }
1488         }
1489
1490         function undelete() {
1491                 global $wgUploadMaintenance;
1492
1493                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1494                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1495                 }
1496
1497                 if ( wfReadOnly() ) {
1498                         throw new ReadOnlyError;
1499                 }
1500
1501                 $out = $this->getOutput();
1502                 $archive = new PageArchive( $this->mTargetObj );
1503                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1504                 $ok = $archive->undelete(
1505                         $this->mTargetTimestamp,
1506                         $this->mComment,
1507                         $this->mFileVersions,
1508                         $this->mUnsuppress,
1509                         $this->getUser()
1510                 );
1511
1512                 if( is_array( $ok ) ) {
1513                         if ( $ok[1] ) { // Undeleted file count
1514                                 wfRunHooks( 'FileUndeleteComplete', array(
1515                                         $this->mTargetObj, $this->mFileVersions,
1516                                         $this->getUser(), $this->mComment ) );
1517                         }
1518
1519                         $link = Linker::linkKnown( $this->mTargetObj );
1520                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1521                 } else {
1522                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1523                 }
1524
1525                 // Show revision undeletion warnings and errors
1526                 $status = $archive->getRevisionStatus();
1527                 if( $status && !$status->isGood() ) {
1528                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'cannotundelete', 'cannotundelete' ) . '</div>' );
1529                 }
1530
1531                 // Show file undeletion warnings and errors
1532                 $status = $archive->getFileStatus();
1533                 if( $status && !$status->isGood() ) {
1534                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1535                 }
1536         }
1537 }