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