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