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         /** @var Title */
  31         protected $title;
  32
  33         /** @var Status */
  34         protected $fileStatus;
  35
  36         /** @var Status */
  37         protected $revisionStatus;
  38
  39         function __construct( $title ) {
  40                 if ( is_null( $title ) ) {
  41                         throw new MWException( __METHOD__ . ' given a null title.' );
  42                 }
  43                 $this->title = $title;
  44         }
  45
  46         /**
  47          * List all deleted pages recorded in the archive table. Returns result
  48          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  49          * namespace/title.
  50          *
  51          * @return ResultWrapper
  52          */
  53         public static function listAllPages() {
  54                 $dbr = wfGetDB( DB_SLAVE );
  55
  56                 return self::listPages( $dbr, '' );
  57         }
  58
  59         /**
  60          * List deleted pages recorded in the archive table matching the
  61          * given title prefix.
  62          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  63          *
  64          * @param string $prefix Title prefix
  65          * @return ResultWrapper
  66          */
  67         public static function listPagesByPrefix( $prefix ) {
  68                 $dbr = wfGetDB( DB_SLAVE );
  69
  70                 $title = Title::newFromText( $prefix );
  71                 if ( $title ) {
  72                         $ns = $title->getNamespace();
  73                         $prefix = $title->getDBkey();
  74                 } else {
  75                         // Prolly won't work too good
  76                         // @todo handle bare namespace names cleanly?
  77                         $ns = 0;
  78                 }
  79
  80                 $conds = array(
  81                         'ar_namespace' => $ns,
  82                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  83                 );
  84
  85                 return self::listPages( $dbr, $conds );
  86         }
  87
  88         /**
  89          * @param DatabaseBase $dbr
  90          * @param string|array $condition
  91          * @return bool|ResultWrapper
  92          */
  93         protected static function listPages( $dbr, $condition ) {
  94                 return $dbr->resultObject( $dbr->select(
  95                         array( 'archive' ),
  96                         array(
  97                                 'ar_namespace',
  98                                 'ar_title',
  99                                 'count' => 'COUNT(*)'
 100                         ),
 101                         $condition,
 102                         __METHOD__,
 103                         array(
 104                                 'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 105                                 'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 106                                 'LIMIT' => 100,
 107                         )
 108                 ) );
 109         }
 110
 111         /**
 112          * List the revisions of the given page. Returns result wrapper with
 113          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 114          *
 115          * @return ResultWrapper
 116          */
 117         function listRevisions() {
 118                 global $wgContentHandlerUseDB;
 119
 120                 $dbr = wfGetDB( DB_SLAVE );
 121
 122                 $tables = array( 'archive' );
 123
 124                 $fields = array(
 125                         'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 126                         'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1',
 127                 );
 128
 129                 if ( $wgContentHandlerUseDB ) {
 130                         $fields[] = 'ar_content_format';
 131                         $fields[] = 'ar_content_model';
 132                 }
 133
 134                 $conds = array( 'ar_namespace' => $this->title->getNamespace(),
 135                         'ar_title' => $this->title->getDBkey() );
 136
 137                 $options = array( 'ORDER BY' => 'ar_timestamp DESC' );
 138
 139                 $join_conds = array();
 140
 141                 ChangeTags::modifyDisplayQuery(
 142                         $tables,
 143                         $fields,
 144                         $conds,
 145                         $join_conds,
 146                         $options
 147                 );
 148
 149                 $res = $dbr->select( $tables,
 150                         $fields,
 151                         $conds,
 152                         __METHOD__,
 153                         $options,
 154                         $join_conds
 155                 );
 156
 157                 return $dbr->resultObject( $res );
 158         }
 159
 160         /**
 161          * List the deleted file revisions for this page, if it's a file page.
 162          * Returns a result wrapper with various filearchive fields, or null
 163          * if not a file page.
 164          *
 165          * @return ResultWrapper
 166          * @todo Does this belong in Image for fuller encapsulation?
 167          */
 168         function listFiles() {
 169                 if ( $this->title->getNamespace() != NS_FILE ) {
 170                         return null;
 171                 }
 172
 173                 $dbr = wfGetDB( DB_SLAVE );
 174                 $res = $dbr->select(
 175                         'filearchive',
 176                         ArchivedFile::selectFields(),
 177                         array( 'fa_name' => $this->title->getDBkey() ),
 178                         __METHOD__,
 179                         array( 'ORDER BY' => 'fa_timestamp DESC' )
 180                 );
 181
 182                 return $dbr->resultObject( $res );
 183         }
 184
 185         /**
 186          * Return a Revision object containing data for the deleted revision.
 187          * Note that the result *may* or *may not* have a null page ID.
 188          *
 189          * @param string $timestamp
 190          * @return Revision|null
 191          */
 192         function getRevision( $timestamp ) {
 193                 global $wgContentHandlerUseDB;
 194
 195                 $dbr = wfGetDB( DB_SLAVE );
 196
 197                 $fields = array(
 198                         'ar_rev_id',
 199                         'ar_text',
 200                         'ar_comment',
 201                         'ar_user',
 202                         'ar_user_text',
 203                         'ar_timestamp',
 204                         'ar_minor_edit',
 205                         'ar_flags',
 206                         'ar_text_id',
 207                         'ar_deleted',
 208                         'ar_len',
 209                         'ar_sha1',
 210                 );
 211
 212                 if ( $wgContentHandlerUseDB ) {
 213                         $fields[] = 'ar_content_format';
 214                         $fields[] = 'ar_content_model';
 215                 }
 216
 217                 $row = $dbr->selectRow( 'archive',
 218                         $fields,
 219                         array( 'ar_namespace' => $this->title->getNamespace(),
 220                                 'ar_title' => $this->title->getDBkey(),
 221                                 'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 222                         __METHOD__ );
 223
 224                 if ( $row ) {
 225                         return Revision::newFromArchiveRow( $row, array( 'title' => $this->title ) );
 226                 }
 227
 228                 return null;
 229         }
 230
 231         /**
 232          * Return the most-previous revision, either live or deleted, against
 233          * the deleted revision given by timestamp.
 234          *
 235          * May produce unexpected results in case of history merges or other
 236          * unusual time issues.
 237          *
 238          * @param string $timestamp
 239          * @return Revision|null Null when there is no previous revision
 240          */
 241         function getPreviousRevision( $timestamp ) {
 242                 $dbr = wfGetDB( DB_SLAVE );
 243
 244                 // Check the previous deleted revision...
 245                 $row = $dbr->selectRow( 'archive',
 246                         'ar_timestamp',
 247                         array( 'ar_namespace' => $this->title->getNamespace(),
 248                                 'ar_title' => $this->title->getDBkey(),
 249                                 'ar_timestamp < ' .
 250                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 251                         __METHOD__,
 252                         array(
 253                                 'ORDER BY' => 'ar_timestamp DESC',
 254                                 'LIMIT' => 1 ) );
 255                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 256
 257                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 258                         array( 'rev_id', 'rev_timestamp' ),
 259                         array(
 260                                 'page_namespace' => $this->title->getNamespace(),
 261                                 'page_title' => $this->title->getDBkey(),
 262                                 'page_id = rev_page',
 263                                 'rev_timestamp < ' .
 264                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 265                         __METHOD__,
 266                         array(
 267                                 'ORDER BY' => 'rev_timestamp DESC',
 268                                 'LIMIT' => 1 ) );
 269                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 270                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 271
 272                 if ( $prevLive && $prevLive > $prevDeleted ) {
 273                         // Most prior revision was live
 274                         return Revision::newFromId( $prevLiveId );
 275                 } elseif ( $prevDeleted ) {
 276                         // Most prior revision was deleted
 277                         return $this->getRevision( $prevDeleted );
 278                 }
 279
 280                 // No prior revision on this page.
 281                 return null;
 282         }
 283
 284         /**
 285          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 286          *
 287          * @param object $row Database row
 288          * @return string
 289          */
 290         function getTextFromRow( $row ) {
 291                 if ( is_null( $row->ar_text_id ) ) {
 292                         // An old row from MediaWiki 1.4 or previous.
 293                         // Text is embedded in this row in classic compression format.
 294                         return Revision::getRevisionText( $row, 'ar_' );
 295                 }
 296
 297                 // New-style: keyed to the text storage backend.
 298                 $dbr = wfGetDB( DB_SLAVE );
 299                 $text = $dbr->selectRow( 'text',
 300                         array( 'old_text', 'old_flags' ),
 301                         array( 'old_id' => $row->ar_text_id ),
 302                         __METHOD__ );
 303
 304                 return Revision::getRevisionText( $text );
 305         }
 306
 307         /**
 308          * Fetch (and decompress if necessary) the stored text of the most
 309          * recently edited deleted revision of the page.
 310          *
 311          * If there are no archived revisions for the page, returns NULL.
 312          *
 313          * @return string|null
 314          */
 315         function getLastRevisionText() {
 316                 $dbr = wfGetDB( DB_SLAVE );
 317                 $row = $dbr->selectRow( 'archive',
 318                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 319                         array( 'ar_namespace' => $this->title->getNamespace(),
 320                                 'ar_title' => $this->title->getDBkey() ),
 321                         __METHOD__,
 322                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 323
 324                 if ( $row ) {
 325                         return $this->getTextFromRow( $row );
 326                 }
 327
 328                 return null;
 329         }
 330
 331         /**
 332          * Quick check if any archived revisions are present for the page.
 333          *
 334          * @return bool
 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
 344                 return ( $n > 0 );
 345         }
 346
 347         /**
 348          * Restore the given (or all) text and file revisions for the page.
 349          * Once restored, the items will be removed from the archive tables.
 350          * The deletion log will be updated with an undeletion notice.
 351          *
 352          * @param array $timestamps Pass an empty array to restore all revisions,
 353          *   otherwise list the ones to undelete.
 354          * @param string $comment
 355          * @param array $fileVersions
 356          * @param bool $unsuppress
 357          * @param User $user User performing the action, or null to use $wgUser
 358          * @return array(number of file revisions restored, number of image revisions
 359          *   restored, log message) on success, false on failure.
 360          */
 361         function undelete( $timestamps, $comment = '', $fileVersions = array(),
 362                 $unsuppress = false, User $user = null
 363         ) {
 364                 // If both the set of text revisions and file revisions are empty,
 365                 // restore everything. Otherwise, just restore the requested items.
 366                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 367
 368                 $restoreText = $restoreAll || !empty( $timestamps );
 369                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 370
 371                 if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 372                         $img = wfLocalFile( $this->title );
 373                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 374                         if ( !$this->fileStatus->isOK() ) {
 375                                 return false;
 376                         }
 377                         $filesRestored = $this->fileStatus->successCount;
 378                 } else {
 379                         $filesRestored = 0;
 380                 }
 381
 382                 if ( $restoreText ) {
 383                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 384                         if ( !$this->revisionStatus->isOK() ) {
 385                                 return false;
 386                         }
 387
 388                         $textRestored = $this->revisionStatus->getValue();
 389                 } else {
 390                         $textRestored = 0;
 391                 }
 392
 393                 // Touch the log!
 394
 395                 if ( $textRestored && $filesRestored ) {
 396                         $reason = wfMessage( 'undeletedrevisions-files' )
 397                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 398                 } elseif ( $textRestored ) {
 399                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 400                                 ->inContentLanguage()->text();
 401                 } elseif ( $filesRestored ) {
 402                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 403                                 ->inContentLanguage()->text();
 404                 } else {
 405                         wfDebug( "Undelete: nothing undeleted...\n" );
 406
 407                         return false;
 408                 }
 409
 410                 if ( trim( $comment ) != '' ) {
 411                         $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
 412                 }
 413
 414                 if ( $user === null ) {
 415                         global $wgUser;
 416                         $user = $wgUser;
 417                 }
 418
 419                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 420                 $logEntry->setPerformer( $user );
 421                 $logEntry->setTarget( $this->title );
 422                 $logEntry->setComment( $reason );
 423
 424                 wfRunHooks( 'ArticleUndeleteLogEntry', array( $this, &$logEntry, $user ) );
 425
 426                 $logid = $logEntry->insert();
 427                 $logEntry->publish( $logid );
 428
 429                 return array( $textRestored, $filesRestored, $reason );
 430         }
 431
 432         /**
 433          * This is the meaty bit -- restores archived revisions of the given page
 434          * to the cur/old tables. If the page currently exists, all revisions will
 435          * be stuffed into old, otherwise the most recent will go into cur.
 436          *
 437          * @param array $timestamps Pass an empty array to restore all revisions,
 438          *   otherwise list the ones to undelete.
 439          * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
 440          * @param string $comment
 441          * @throws ReadOnlyError
 442          * @return Status Status object containing the number of revisions restored on success
 443          */
 444         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 445                 global $wgContentHandlerUseDB;
 446
 447                 if ( wfReadOnly() ) {
 448                         throw new ReadOnlyError();
 449                 }
 450
 451                 $restoreAll = empty( $timestamps );
 452                 $dbw = wfGetDB( DB_MASTER );
 453
 454                 # Does this page already exist? We'll have to update it...
 455                 $article = WikiPage::factory( $this->title );
 456                 # Load latest data for the current page (bug 31179)
 457                 $article->loadPageData( 'fromdbmaster' );
 458                 $oldcountable = $article->isCountable();
 459
 460                 $page = $dbw->selectRow( 'page',
 461                         array( 'page_id', 'page_latest' ),
 462                         array( 'page_namespace' => $this->title->getNamespace(),
 463                                 'page_title' => $this->title->getDBkey() ),
 464                         __METHOD__,
 465                         array( 'FOR UPDATE' ) // lock page
 466                 );
 467
 468                 if ( $page ) {
 469                         $makepage = false;
 470                         # Page already exists. Import the history, and if necessary
 471                         # we'll update the latest revision field in the record.
 472
 473                         $previousRevId = $page->page_latest;
 474
 475                         # Get the time span of this page
 476                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 477                                 array( 'rev_id' => $previousRevId ),
 478                                 __METHOD__ );
 479
 480                         if ( $previousTimestamp === false ) {
 481                                 wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
 482
 483                                 $status = Status::newGood( 0 );
 484                                 $status->warning( 'undeleterevision-missing' );
 485
 486                                 return $status;
 487                         }
 488                 } else {
 489                         # Have to create a new article...
 490                         $makepage = true;
 491                         $previousRevId = 0;
 492                         $previousTimestamp = 0;
 493                 }
 494
 495                 if ( $restoreAll ) {
 496                         $oldones = '1 = 1'; # All revisions...
 497                 } else {
 498                         $oldts = implode( ',',
 499                                 array_map( array( &$dbw, 'addQuotes' ),
 500                                         array_map( array( &$dbw, 'timestamp' ),
 501                                                 $timestamps ) ) );
 502
 503                         $oldones = "ar_timestamp IN ( {$oldts} )";
 504                 }
 505
 506                 $fields = array(
 507                         'ar_rev_id',
 508                         'ar_text',
 509                         'ar_comment',
 510                         'ar_user',
 511                         'ar_user_text',
 512                         'ar_timestamp',
 513                         'ar_minor_edit',
 514                         'ar_flags',
 515                         'ar_text_id',
 516                         'ar_deleted',
 517                         'ar_page_id',
 518                         'ar_len',
 519                         'ar_sha1'
 520                 );
 521
 522                 if ( $wgContentHandlerUseDB ) {
 523                         $fields[] = 'ar_content_format';
 524                         $fields[] = 'ar_content_model';
 525                 }
 526
 527                 /**
 528                  * Select each archived revision...
 529                  */
 530                 $result = $dbw->select( 'archive',
 531                         $fields,
 532                         /* WHERE */ array(
 533                                 'ar_namespace' => $this->title->getNamespace(),
 534                                 'ar_title' => $this->title->getDBkey(),
 535                                 $oldones ),
 536                         __METHOD__,
 537                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 538                 );
 539                 $ret = $dbw->resultObject( $result );
 540                 $rev_count = $dbw->numRows( $result );
 541
 542                 if ( !$rev_count ) {
 543                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 544
 545                         $status = Status::newGood( 0 );
 546                         $status->warning( "undelete-no-results" );
 547
 548                         return $status;
 549                 }
 550
 551                 $ret->seek( $rev_count - 1 ); // move to last
 552                 $row = $ret->fetchObject(); // get newest archived rev
 553                 $ret->seek( 0 ); // move back
 554
 555                 // grab the content to check consistency with global state before restoring the page.
 556                 $revision = Revision::newFromArchiveRow( $row,
 557                         array(
 558                                 'title' => $article->getTitle(), // used to derive default content model
 559                         )
 560                 );
 561                 $user = User::newFromName( $revision->getRawUserText(), false );
 562                 $content = $revision->getContent( Revision::RAW );
 563
 564                 //NOTE: article ID may not be known yet. prepareSave() should not modify the database.
 565                 $status = $content->prepareSave( $article, 0, -1, $user );
 566
 567                 if ( !$status->isOK() ) {
 568                         return $status;
 569                 }
 570
 571                 if ( $makepage ) {
 572                         // Check the state of the newest to-be version...
 573                         if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 574                                 return Status::newFatal( "undeleterevdel" );
 575                         }
 576                         // Safe to insert now...
 577                         $newid = $article->insertOn( $dbw );
 578                         $pageId = $newid;
 579                 } else {
 580                         // Check if a deleted revision will become the current revision...
 581                         if ( $row->ar_timestamp > $previousTimestamp ) {
 582                                 // Check the state of the newest to-be version...
 583                                 if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 584                                         return Status::newFatal( "undeleterevdel" );
 585                                 }
 586                         }
 587
 588                         $newid = false;
 589                         $pageId = $article->getId();
 590                 }
 591
 592                 $revision = null;
 593                 $restored = 0;
 594
 595                 foreach ( $ret as $row ) {
 596                         // Check for key dupes due to shitty archive integrity.
 597                         if ( $row->ar_rev_id ) {
 598                                 $exists = $dbw->selectField( 'revision', '1',
 599                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 600                                 if ( $exists ) {
 601                                         continue; // don't throw DB errors
 602                                 }
 603                         }
 604                         // Insert one revision at a time...maintaining deletion status
 605                         // unless we are specifically removing all restrictions...
 606                         $revision = Revision::newFromArchiveRow( $row,
 607                                 array(
 608                                         'page' => $pageId,
 609                                         'title' => $this->title,
 610                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 611                                 ) );
 612
 613                         $revision->insertOn( $dbw );
 614                         $restored++;
 615
 616                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 617                 }
 618                 # Now that it's safely stored, take it out of the archive
 619                 $dbw->delete( 'archive',
 620                         /* WHERE */ array(
 621                                 'ar_namespace' => $this->title->getNamespace(),
 622                                 'ar_title' => $this->title->getDBkey(),
 623                                 $oldones ),
 624                         __METHOD__ );
 625
 626                 // Was anything restored at all?
 627                 if ( $restored == 0 ) {
 628                         return Status::newGood( 0 );
 629                 }
 630
 631                 $created = (bool)$newid;
 632
 633                 // Attach the latest revision to the page...
 634                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 635                 if ( $created || $wasnew ) {
 636                         // Update site stats, link tables, etc
 637                         $user = User::newFromName( $revision->getRawUserText(), false );
 638                         $article->doEditUpdates(
 639                                 $revision,
 640                                 $user,
 641                                 array( 'created' => $created, 'oldcountable' => $oldcountable )
 642                         );
 643                 }
 644
 645                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 646
 647                 if ( $this->title->getNamespace() == NS_FILE ) {
 648                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 649                         $update->doUpdate();
 650                 }
 651
 652                 return Status::newGood( $restored );
 653         }
 654
 655         /**
 656          * @return Status
 657          */
 658         function getFileStatus() {
 659                 return $this->fileStatus;
 660         }
 661
 662         /**
 663          * @return Status
 664          */
 665         function getRevisionStatus() {
 666                 return $this->revisionStatus;
 667         }
 668 }
 669
 670 /**
 671  * Special page allowing users with the appropriate permissions to view
 672  * and restore deleted content.
 673  *
 674  * @ingroup SpecialPage
 675  */
 676 class SpecialUndelete extends SpecialPage {
 677         private $mAction;
 678         private $mTarget;
 679         private $mTimestamp;
 680         private $mRestore;
 681         private $mInvert;
 682         private $mFilename;
 683         private $mTargetTimestamp;
 684         private $mAllowed;
 685         private $mCanView;
 686         private $mComment;
 687         private $mToken;
 688
 689         /** @var Title */
 690         private $mTargetObj;
 691
 692         function __construct() {
 693                 parent::__construct( 'Undelete', 'deletedhistory' );
 694         }
 695
 696         function loadRequest( $par ) {
 697                 $request = $this->getRequest();
 698                 $user = $this->getUser();
 699
 700                 $this->mAction = $request->getVal( 'action' );
 701                 if ( $par !== null && $par !== '' ) {
 702                         $this->mTarget = $par;
 703                 } else {
 704                         $this->mTarget = $request->getVal( 'target' );
 705                 }
 706
 707                 $this->mTargetObj = null;
 708
 709                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 710                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 711                 }
 712
 713                 $this->mSearchPrefix = $request->getText( 'prefix' );
 714                 $time = $request->getVal( 'timestamp' );
 715                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 716                 $this->mFilename = $request->getVal( 'file' );
 717
 718                 $posted = $request->wasPosted() &&
 719                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 720                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 721                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 722                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 723                 $this->mDiff = $request->getCheck( 'diff' );
 724                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 725                 $this->mComment = $request->getText( 'wpComment' );
 726                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 727                 $this->mToken = $request->getVal( 'token' );
 728
 729                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 730                         $this->mAllowed = true; // user can restore
 731                         $this->mCanView = true; // user can view content
 732                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 733                         $this->mAllowed = false; // user cannot restore
 734                         $this->mCanView = true; // user can view content
 735                         $this->mRestore = false;
 736                 } else { // user can only view the list of revisions
 737                         $this->mAllowed = false;
 738                         $this->mCanView = false;
 739                         $this->mTimestamp = '';
 740                         $this->mRestore = false;
 741                 }
 742
 743                 if ( $this->mRestore || $this->mInvert ) {
 744                         $timestamps = array();
 745                         $this->mFileVersions = array();
 746                         foreach ( $request->getValues() as $key => $val ) {
 747                                 $matches = array();
 748                                 if ( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 749                                         array_push( $timestamps, $matches[1] );
 750                                 }
 751
 752                                 if ( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 753                                         $this->mFileVersions[] = intval( $matches[1] );
 754                                 }
 755                         }
 756                         rsort( $timestamps );
 757                         $this->mTargetTimestamp = $timestamps;
 758                 }
 759         }
 760
 761         function execute( $par ) {
 762                 $this->checkPermissions();
 763                 $user = $this->getUser();
 764
 765                 $this->setHeaders();
 766                 $this->outputHeader();
 767
 768                 $this->loadRequest( $par );
 769
 770                 $out = $this->getOutput();
 771
 772                 if ( is_null( $this->mTargetObj ) ) {
 773                         $out->addWikiMsg( 'undelete-header' );
 774
 775                         # Not all users can just browse every deleted page from the list
 776                         if ( $user->isAllowed( 'browsearchive' ) ) {
 777                                 $this->showSearchForm();
 778                         }
 779
 780                         return;
 781                 }
 782
 783                 if ( $this->mAllowed ) {
 784                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 785                 } else {
 786                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 787                 }
 788
 789                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 790
 791                 if ( $this->mTimestamp !== '' ) {
 792                         $this->showRevision( $this->mTimestamp );
 793                 } elseif ( $this->mFilename !== null && $this->mTargetObj->inNamespace( NS_FILE ) ) {
 794                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 795                         // Check if user is allowed to see this file
 796                         if ( !$file->exists() ) {
 797                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 798                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 799                                 if ( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 800                                         throw new PermissionsError( 'suppressrevision' );
 801                                 } else {
 802                                         throw new PermissionsError( 'deletedtext' );
 803                                 }
 804                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 805                                 $this->showFileConfirmationForm( $this->mFilename );
 806                         } else {
 807                                 $this->showFile( $this->mFilename );
 808                         }
 809                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 810                         $this->undelete();
 811                 } else {
 812                         $this->showHistory();
 813                 }
 814         }
 815
 816         function showSearchForm() {
 817                 global $wgScript;
 818
 819                 $out = $this->getOutput();
 820                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 821                 $out->addHTML(
 822                         Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) ) .
 823                                 Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 824                                 Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
 825                                 Html::rawElement(
 826                                         'label',
 827                                         array( 'for' => 'prefix' ),
 828                                         $this->msg( 'undelete-search-prefix' )->parse()
 829                                 ) .
 830                                 Xml::input(
 831                                         'prefix',
 832                                         20,
 833                                         $this->mSearchPrefix,
 834                                         array( 'id' => 'prefix', 'autofocus' => true )
 835                                 ) . ' ' .
 836                                 Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 837                                 Xml::closeElement( 'fieldset' ) .
 838                                 Xml::closeElement( 'form' )
 839                 );
 840
 841                 # List undeletable articles
 842                 if ( $this->mSearchPrefix ) {
 843                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 844                         $this->showList( $result );
 845                 }
 846         }
 847
 848         /**
 849          * Generic list of deleted pages
 850          *
 851          * @param ResultWrapper $result
 852          * @return bool
 853          */
 854         private function showList( $result ) {
 855                 $out = $this->getOutput();
 856
 857                 if ( $result->numRows() == 0 ) {
 858                         $out->addWikiMsg( 'undelete-no-results' );
 859
 860                         return false;
 861                 }
 862
 863                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 864
 865                 $undelete = $this->getPageTitle();
 866                 $out->addHTML( "<ul>\n" );
 867                 foreach ( $result as $row ) {
 868                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 869                         if ( $title !== null ) {
 870                                 $item = Linker::linkKnown(
 871                                         $undelete,
 872                                         htmlspecialchars( $title->getPrefixedText() ),
 873                                         array(),
 874                                         array( 'target' => $title->getPrefixedText() )
 875                                 );
 876                         } else {
 877                                 // The title is no longer valid, show as text
 878                                 $item = Html::element(
 879                                         'span',
 880                                         array( 'class' => 'mw-invalidtitle' ),
 881                                         Linker::getInvalidTitleDescription(
 882                                                 $this->getContext(),
 883                                                 $row->ar_namespace,
 884                                                 $row->ar_title
 885                                         )
 886                                 );
 887                         }
 888                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 889                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 890                 }
 891                 $result->free();
 892                 $out->addHTML( "</ul>\n" );
 893
 894                 return true;
 895         }
 896
 897         private function showRevision( $timestamp ) {
 898                 if ( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 899                         return;
 900                 }
 901
 902                 $archive = new PageArchive( $this->mTargetObj );
 903                 if ( !wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) ) ) {
 904                         return;
 905                 }
 906                 $rev = $archive->getRevision( $timestamp );
 907
 908                 $out = $this->getOutput();
 909                 $user = $this->getUser();
 910
 911                 if ( !$rev ) {
 912                         $out->addWikiMsg( 'undeleterevision-missing' );
 913
 914                         return;
 915                 }
 916
 917                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 918                         if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 919                                 $out->wrapWikiMsg(
 920                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 921                                         'rev-deleted-text-permission'
 922                                 );
 923
 924                                 return;
 925                         }
 926
 927                         $out->wrapWikiMsg(
 928                                 "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 929                                 'rev-deleted-text-view'
 930                         );
 931                         $out->addHTML( '<br />' );
 932                         // and we are allowed to see...
 933                 }
 934
 935                 if ( $this->mDiff ) {
 936                         $previousRev = $archive->getPreviousRevision( $timestamp );
 937                         if ( $previousRev ) {
 938                                 $this->showDiff( $previousRev, $rev );
 939                                 if ( $this->mDiffOnly ) {
 940                                         return;
 941                                 }
 942
 943                                 $out->addHTML( '<hr />' );
 944                         } else {
 945                                 $out->addWikiMsg( 'undelete-nodiff' );
 946                         }
 947                 }
 948
 949                 $link = Linker::linkKnown(
 950                         $this->getPageTitle( $this->mTargetObj->getPrefixedDBkey() ),
 951                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 952                 );
 953
 954                 $lang = $this->getLanguage();
 955
 956                 // date and time are separate parameters to facilitate localisation.
 957                 // $time is kept for backward compat reasons.
 958                 $time = $lang->userTimeAndDate( $timestamp, $user );
 959                 $d = $lang->userDate( $timestamp, $user );
 960                 $t = $lang->userTime( $timestamp, $user );
 961                 $userLink = Linker::revUserTools( $rev );
 962
 963                 $content = $rev->getContent( Revision::FOR_THIS_USER, $user );
 964
 965                 $isText = ( $content instanceof TextContent );
 966
 967                 if ( $this->mPreview || $isText ) {
 968                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 969                 } else {
 970                         $openDiv = '<div id="mw-undelete-revision">';
 971                 }
 972                 $out->addHTML( $openDiv );
 973
 974                 // Revision delete links
 975                 if ( !$this->mDiff ) {
 976                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 977                         if ( $revdel ) {
 978                                 $out->addHTML( "$revdel " );
 979                         }
 980                 }
 981
 982                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 983                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 984
 985                 if ( !wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) ) ) {
 986                         return;
 987                 }
 988
 989                 if ( $this->mPreview || !$isText ) {
 990                         // NOTE: non-text content has no source view, so always use rendered preview
 991
 992                         // Hide [edit]s
 993                         $popts = $out->parserOptions();
 994                         $popts->setEditSection( false );
 995
 996                         $pout = $content->getParserOutput( $this->mTargetObj, $rev->getId(), $popts, true );
 997                         $out->addParserOutput( $pout );
 998                 }
 999
1000                 if ( $isText ) {
1001                         // source view for textual content
1002                         $sourceView = Xml::element(
1003                                 'textarea',
1004                                 array(
1005                                         'readonly' => 'readonly',
1006                                         'cols' => $user->getIntOption( 'cols' ),
1007                                         'rows' => $user->getIntOption( 'rows' )
1008                                 ),
1009                                 $content->getNativeData() . "\n"
1010                         );
1011
1012                         $previewButton = Xml::element( 'input', array(
1013                                 'type' => 'submit',
1014                                 'name' => 'preview',
1015                                 'value' => $this->msg( 'showpreview' )->text()
1016                         ) );
1017                 } else {
1018                         $sourceView = '';
1019                         $previewButton = '';
1020                 }
1021
1022                 $diffButton = Xml::element( 'input', array(
1023                         'name' => 'diff',
1024                         'type' => 'submit',
1025                         'value' => $this->msg( 'showdiff' )->text() ) );
1026
1027                 $out->addHTML(
1028                         $sourceView .
1029                                 Xml::openElement( 'div', array(
1030                                         'style' => 'clear: both' ) ) .
1031                                 Xml::openElement( 'form', array(
1032                                         'method' => 'post',
1033                                         'action' => $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
1034                                 Xml::element( 'input', array(
1035                                         'type' => 'hidden',
1036                                         'name' => 'target',
1037                                         'value' => $this->mTargetObj->getPrefixedDBkey() ) ) .
1038                                 Xml::element( 'input', array(
1039                                         'type' => 'hidden',
1040                                         'name' => 'timestamp',
1041                                         'value' => $timestamp ) ) .
1042                                 Xml::element( 'input', array(
1043                                         'type' => 'hidden',
1044                                         'name' => 'wpEditToken',
1045                                         'value' => $user->getEditToken() ) ) .
1046                                 $previewButton .
1047                                 $diffButton .
1048                                 Xml::closeElement( 'form' ) .
1049                                 Xml::closeElement( 'div' )
1050                 );
1051         }
1052
1053         /**
1054          * Build a diff display between this and the previous either deleted
1055          * or non-deleted edit.
1056          *
1057          * @param Revision $previousRev
1058          * @param Revision $currentRev
1059          * @return string HTML
1060          */
1061         function showDiff( $previousRev, $currentRev ) {
1062                 $diffContext = clone $this->getContext();
1063                 $diffContext->setTitle( $currentRev->getTitle() );
1064                 $diffContext->setWikiPage( WikiPage::factory( $currentRev->getTitle() ) );
1065
1066                 $diffEngine = $currentRev->getContentHandler()->createDifferenceEngine( $diffContext );
1067                 $diffEngine->showDiffStyle();
1068
1069                 $formattedDiff = $diffEngine->generateContentDiffBody(
1070                         $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
1071                         $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() )
1072                 );
1073
1074                 $formattedDiff = $diffEngine->addHeader(
1075                         $formattedDiff,
1076                         $this->diffHeader( $previousRev, 'o' ),
1077                         $this->diffHeader( $currentRev, 'n' )
1078                 );
1079
1080                 $this->getOutput()->addHTML( "<div>$formattedDiff</div>\n" );
1081         }
1082
1083         /**
1084          * @param Revision $rev
1085          * @param string $prefix
1086          * @return string
1087          */
1088         private function diffHeader( $rev, $prefix ) {
1089                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
1090                 if ( $isDeleted ) {
1091                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
1092                         $targetPage = $this->getPageTitle();
1093                         $targetQuery = array(
1094                                 'target' => $this->mTargetObj->getPrefixedText(),
1095                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
1096                         );
1097                 } else {
1098                         /// @todo FIXME: getId() may return non-zero for deleted revs...
1099                         $targetPage = $rev->getTitle();
1100                         $targetQuery = array( 'oldid' => $rev->getId() );
1101                 }
1102
1103                 // Add show/hide deletion links if available
1104                 $user = $this->getUser();
1105                 $lang = $this->getLanguage();
1106                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1107
1108                 if ( $rdel ) {
1109                         $rdel = " $rdel";
1110                 }
1111
1112                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1113
1114                 $tags = wfGetDB( DB_SLAVE )->selectField(
1115                         'tag_summary',
1116                         'ts_tags',
1117                         array( 'ts_rev_id' => $rev->getId() ),
1118                         __METHOD__
1119                 );
1120                 $tagSummary = ChangeTags::formatSummaryRow( $tags, 'deleteddiff' );
1121
1122                 // FIXME This is reimplementing DifferenceEngine#getRevisionHeader
1123                 // and partially #showDiffPage, but worse
1124                 return '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1125                         Linker::link(
1126                                 $targetPage,
1127                                 $this->msg(
1128                                         'revisionasof',
1129                                         $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
1130                                         $lang->userDate( $rev->getTimestamp(), $user ),
1131                                         $lang->userTime( $rev->getTimestamp(), $user )
1132                                 )->escaped(),
1133                                 array(),
1134                                 $targetQuery
1135                         ) .
1136                         '</strong></div>' .
1137                         '<div id="mw-diff-' . $prefix . 'title2">' .
1138                         Linker::revUserTools( $rev ) . '<br />' .
1139                         '</div>' .
1140                         '<div id="mw-diff-' . $prefix . 'title3">' .
1141                         $minor . Linker::revComment( $rev ) . $rdel . '<br />' .
1142                         '</div>' .
1143                         '<div id="mw-diff-' . $prefix . 'title5">' .
1144                         $tagSummary[0] . '<br />' .
1145                         '</div>';
1146         }
1147
1148         /**
1149          * Show a form confirming whether a tokenless user really wants to see a file
1150          * @param string $key
1151          */
1152         private function showFileConfirmationForm( $key ) {
1153                 $out = $this->getOutput();
1154                 $lang = $this->getLanguage();
1155                 $user = $this->getUser();
1156                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1157                 $out->addWikiMsg( 'undelete-show-file-confirm',
1158                         $this->mTargetObj->getText(),
1159                         $lang->userDate( $file->getTimestamp(), $user ),
1160                         $lang->userTime( $file->getTimestamp(), $user ) );
1161                 $out->addHTML(
1162                         Xml::openElement( 'form', array(
1163                                         'method' => 'POST',
1164                                         'action' => $this->getPageTitle()->getLocalURL( array(
1165                                                 'target' => $this->mTarget,
1166                                                 'file' => $key,
1167                                                 'token' => $user->getEditToken( $key ),
1168                                         ) ),
1169                                 )
1170                         ) .
1171                                 Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1172                                 '</form>'
1173                 );
1174         }
1175
1176         /**
1177          * Show a deleted file version requested by the visitor.
1178          * @param string $key
1179          */
1180         private function showFile( $key ) {
1181                 $this->getOutput()->disable();
1182
1183                 # We mustn't allow the output to be Squid cached, otherwise
1184                 # if an admin previews a deleted image, and it's cached, then
1185                 # a user without appropriate permissions can toddle off and
1186                 # nab the image, and Squid will serve it
1187                 $response = $this->getRequest()->response();
1188                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1189                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1190                 $response->header( 'Pragma: no-cache' );
1191
1192                 $repo = RepoGroup::singleton()->getLocalRepo();
1193                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1194                 $repo->streamFile( $path );
1195         }
1196
1197         private function showHistory() {
1198                 $out = $this->getOutput();
1199                 if ( $this->mAllowed ) {
1200                         $out->addModules( 'mediawiki.special.undelete' );
1201                 }
1202                 $out->wrapWikiMsg(
1203                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1204                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1205                 );
1206
1207                 $archive = new PageArchive( $this->mTargetObj );
1208                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1209                 /*
1210                 $text = $archive->getLastRevisionText();
1211                 if( is_null( $text ) ) {
1212                         $out->addWikiMsg( 'nohistory' );
1213                         return;
1214                 }
1215                 */
1216                 $out->addHTML( '<div class="mw-undelete-history">' );
1217                 if ( $this->mAllowed ) {
1218                         $out->addWikiMsg( 'undeletehistory' );
1219                         $out->addWikiMsg( 'undeleterevdel' );
1220                 } else {
1221                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1222                 }
1223                 $out->addHTML( '</div>' );
1224
1225                 # List all stored revisions
1226                 $revisions = $archive->listRevisions();
1227                 $files = $archive->listFiles();
1228
1229                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1230                 $haveFiles = $files && $files->numRows() > 0;
1231
1232                 # Batch existence check on user and talk pages
1233                 if ( $haveRevisions ) {
1234                         $batch = new LinkBatch();
1235                         foreach ( $revisions as $row ) {
1236                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1237                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1238                         }
1239                         $batch->execute();
1240                         $revisions->seek( 0 );
1241                 }
1242                 if ( $haveFiles ) {
1243                         $batch = new LinkBatch();
1244                         foreach ( $files as $row ) {
1245                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1246                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1247                         }
1248                         $batch->execute();
1249                         $files->seek( 0 );
1250                 }
1251
1252                 if ( $this->mAllowed ) {
1253                         $action = $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) );
1254                         # Start the form here
1255                         $top = Xml::openElement(
1256                                 'form',
1257                                 array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' )
1258                         );
1259                         $out->addHTML( $top );
1260                 }
1261
1262                 # Show relevant lines from the deletion log:
1263                 $deleteLogPage = new LogPage( 'delete' );
1264                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1265                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1266                 # Show relevant lines from the suppression log:
1267                 $suppressLogPage = new LogPage( 'suppress' );
1268                 if ( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1269                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1270                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1271                 }
1272
1273                 if ( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1274                         # Format the user-visible controls (comment field, submission button)
1275                         # in a nice little table
1276                         if ( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1277                                 $unsuppressBox =
1278                                         "<tr>
1279                                                 <td>&#160;</td>
1280                                                 <td class='mw-input'>" .
1281                                                 Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1282                                                         'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ) .
1283                                                 "</td>
1284                                         </tr>";
1285                         } else {
1286                                 $unsuppressBox = '';
1287                         }
1288
1289                         $table = Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1290                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1291                                 "<tr>
1292                                         <td colspan='2' class='mw-undelete-extrahelp'>" .
1293                                 $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1294                                 "</td>
1295                         </tr>
1296                         <tr>
1297                                 <td class='mw-label'>" .
1298                                 Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1299                                 "</td>
1300                                 <td class='mw-input'>" .
1301                                 Xml::input(
1302                                         'wpComment',
1303                                         50,
1304                                         $this->mComment,
1305                                         array( 'id' => 'wpComment', 'autofocus' => true )
1306                                 ) .
1307                                 "</td>
1308                         </tr>
1309                         <tr>
1310                                 <td>&#160;</td>
1311                                 <td class='mw-submit'>" .
1312                                 Xml::submitButton(
1313                                         $this->msg( 'undeletebtn' )->text(),
1314                                         array( 'name' => 'restore', 'id' => 'mw-undelete-submit' )
1315                                 ) . ' ' .
1316                                 Xml::submitButton(
1317                                         $this->msg( 'undeleteinvert' )->text(),
1318                                         array( 'name' => 'invert', 'id' => 'mw-undelete-invert' )
1319                                 ) .
1320                                 "</td>
1321                         </tr>" .
1322                                 $unsuppressBox .
1323                                 Xml::closeElement( 'table' ) .
1324                                 Xml::closeElement( 'fieldset' );
1325
1326                         $out->addHTML( $table );
1327                 }
1328
1329                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1330
1331                 if ( $haveRevisions ) {
1332                         # The page's stored (deleted) history:
1333                         $out->addHTML( '<ul>' );
1334                         $remaining = $revisions->numRows();
1335                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1336
1337                         foreach ( $revisions as $row ) {
1338                                 $remaining--;
1339                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1340                         }
1341                         $revisions->free();
1342                         $out->addHTML( '</ul>' );
1343                 } else {
1344                         $out->addWikiMsg( 'nohistory' );
1345                 }
1346
1347                 if ( $haveFiles ) {
1348                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1349                         $out->addHTML( '<ul>' );
1350                         foreach ( $files as $row ) {
1351                                 $out->addHTML( $this->formatFileRow( $row ) );
1352                         }
1353                         $files->free();
1354                         $out->addHTML( '</ul>' );
1355                 }
1356
1357                 if ( $this->mAllowed ) {
1358                         # Slip in the hidden controls here
1359                         $misc = Html::hidden( 'target', $this->mTarget );
1360                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1361                         $misc .= Xml::closeElement( 'form' );
1362                         $out->addHTML( $misc );
1363                 }
1364
1365                 return true;
1366         }
1367
1368         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1369                 $rev = Revision::newFromArchiveRow( $row,
1370                         array(
1371                                 'title' => $this->mTargetObj
1372                         ) );
1373
1374                 $revTextSize = '';
1375                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1376                 // Build checkboxen...
1377                 if ( $this->mAllowed ) {
1378                         if ( $this->mInvert ) {
1379                                 if ( in_array( $ts, $this->mTargetTimestamp ) ) {
1380                                         $checkBox = Xml::check( "ts$ts" );
1381                                 } else {
1382                                         $checkBox = Xml::check( "ts$ts", true );
1383                                 }
1384                         } else {
1385                                 $checkBox = Xml::check( "ts$ts" );
1386                         }
1387                 } else {
1388                         $checkBox = '';
1389                 }
1390
1391                 // Build page & diff links...
1392                 $user = $this->getUser();
1393                 if ( $this->mCanView ) {
1394                         $titleObj = $this->getPageTitle();
1395                         # Last link
1396                         if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1397                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1398                                 $last = $this->msg( 'diff' )->escaped();
1399                         } elseif ( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1400                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1401                                 $last = Linker::linkKnown(
1402                                         $titleObj,
1403                                         $this->msg( 'diff' )->escaped(),
1404                                         array(),
1405                                         array(
1406                                                 'target' => $this->mTargetObj->getPrefixedText(),
1407                                                 'timestamp' => $ts,
1408                                                 'diff' => 'prev'
1409                                         )
1410                                 );
1411                         } else {
1412                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1413                                 $last = $this->msg( 'diff' )->escaped();
1414                         }
1415                 } else {
1416                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1417                         $last = $this->msg( 'diff' )->escaped();
1418                 }
1419
1420                 // User links
1421                 $userLink = Linker::revUserTools( $rev );
1422
1423                 // Minor edit
1424                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1425
1426                 // Revision text size
1427                 $size = $row->ar_len;
1428                 if ( !is_null( $size ) ) {
1429                         $revTextSize = Linker::formatRevisionSize( $size );
1430                 }
1431
1432                 // Edit summary
1433                 $comment = Linker::revComment( $rev );
1434
1435                 // Tags
1436                 $attribs = array();
1437                 list( $tagSummary, $classes ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'deletedhistory' );
1438                 if ( $classes ) {
1439                         $attribs['class'] = implode( ' ', $classes );
1440                 }
1441
1442                 // Revision delete links
1443                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1444
1445                 $revisionRow = $this->msg( 'undelete-revision-row' )
1446                         ->rawParams(
1447                                 $checkBox,
1448                                 $revdlink,
1449                                 $last,
1450                                 $pageLink,
1451                                 $userLink,
1452                                 $minor,
1453                                 $revTextSize,
1454                                 $comment,
1455                                 $tagSummary
1456                         )
1457                         ->escaped();
1458
1459                 return Xml::tags( 'li', $attribs, $revisionRow ) . "\n";
1460         }
1461
1462         private function formatFileRow( $row ) {
1463                 $file = ArchivedFile::newFromRow( $row );
1464                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1465                 $user = $this->getUser();
1466
1467                 if ( $this->mAllowed && $row->fa_storage_key ) {
1468                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1469                         $key = urlencode( $row->fa_storage_key );
1470                         $pageLink = $this->getFileLink( $file, $this->getPageTitle(), $ts, $key );
1471                 } else {
1472                         $checkBox = '';
1473                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1474                 }
1475                 $userLink = $this->getFileUser( $file );
1476                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1477                 $bytes = $this->msg( 'parentheses' )
1478                         ->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )
1479                         ->plain();
1480                 $data = htmlspecialchars( $data . ' ' . $bytes );
1481                 $comment = $this->getFileComment( $file );
1482
1483                 // Add show/hide deletion links if available
1484                 $canHide = $user->isAllowed( 'deleterevision' );
1485                 if ( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1486                         if ( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1487                                 // Revision was hidden from sysops
1488                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide );
1489                         } else {
1490                                 $query = array(
1491                                         'type' => 'filearchive',
1492                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1493                                         'ids' => $row->fa_id
1494                                 );
1495                                 $revdlink = Linker::revDeleteLink( $query,
1496                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1497                         }
1498                 } else {
1499                         $revdlink = '';
1500                 }
1501
1502                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1503         }
1504
1505         /**
1506          * Fetch revision text link if it's available to all users
1507          *
1508          * @param Revision $rev
1509          * @param Title $titleObj
1510          * @param string $ts Timestamp
1511          * @return string
1512          */
1513         function getPageLink( $rev, $titleObj, $ts ) {
1514                 $user = $this->getUser();
1515                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1516
1517                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1518                         return '<span class="history-deleted">' . $time . '</span>';
1519                 }
1520
1521                 $link = Linker::linkKnown(
1522                         $titleObj,
1523                         htmlspecialchars( $time ),
1524                         array(),
1525                         array(
1526                                 'target' => $this->mTargetObj->getPrefixedText(),
1527                                 'timestamp' => $ts
1528                         )
1529                 );
1530
1531                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1532                         $link = '<span class="history-deleted">' . $link . '</span>';
1533                 }
1534
1535                 return $link;
1536         }
1537
1538         /**
1539          * Fetch image view link if it's available to all users
1540          *
1541          * @param File|ArchivedFile $file
1542          * @param Title $titleObj
1543          * @param string $ts A timestamp
1544          * @param string $key A storage key
1545          *
1546          * @return string HTML fragment
1547          */
1548         function getFileLink( $file, $titleObj, $ts, $key ) {
1549                 $user = $this->getUser();
1550                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1551
1552                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1553                         return '<span class="history-deleted">' . $time . '</span>';
1554                 }
1555
1556                 $link = Linker::linkKnown(
1557                         $titleObj,
1558                         htmlspecialchars( $time ),
1559                         array(),
1560                         array(
1561                                 'target' => $this->mTargetObj->getPrefixedText(),
1562                                 'file' => $key,
1563                                 'token' => $user->getEditToken( $key )
1564                         )
1565                 );
1566
1567                 if ( $file->isDeleted( File::DELETED_FILE ) ) {
1568                         $link = '<span class="history-deleted">' . $link . '</span>';
1569                 }
1570
1571                 return $link;
1572         }
1573
1574         /**
1575          * Fetch file's user id if it's available to this user
1576          *
1577          * @param File|ArchivedFile $file
1578          * @return string HTML fragment
1579          */
1580         function getFileUser( $file ) {
1581                 if ( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1582                         return '<span class="history-deleted">' .
1583                                 $this->msg( 'rev-deleted-user' )->escaped() .
1584                                 '</span>';
1585                 }
1586
1587                 $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1588                         Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1589
1590                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1591                         $link = '<span class="history-deleted">' . $link . '</span>';
1592                 }
1593
1594                 return $link;
1595         }
1596
1597         /**
1598          * Fetch file upload comment if it's available to this user
1599          *
1600          * @param File|ArchivedFile $file
1601          * @return string HTML fragment
1602          */
1603         function getFileComment( $file ) {
1604                 if ( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1605                         return '<span class="history-deleted"><span class="comment">' .
1606                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1607                 }
1608
1609                 $link = Linker::commentBlock( $file->getRawDescription() );
1610
1611                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1612                         $link = '<span class="history-deleted">' . $link . '</span>';
1613                 }
1614
1615                 return $link;
1616         }
1617
1618         function undelete() {
1619                 global $wgUploadMaintenance;
1620
1621                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1622                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1623                 }
1624
1625                 if ( wfReadOnly() ) {
1626                         throw new ReadOnlyError;
1627                 }
1628
1629                 $out = $this->getOutput();
1630                 $archive = new PageArchive( $this->mTargetObj );
1631                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1632                 $ok = $archive->undelete(
1633                         $this->mTargetTimestamp,
1634                         $this->mComment,
1635                         $this->mFileVersions,
1636                         $this->mUnsuppress,
1637                         $this->getUser()
1638                 );
1639
1640                 if ( is_array( $ok ) ) {
1641                         if ( $ok[1] ) { // Undeleted file count
1642                                 wfRunHooks( 'FileUndeleteComplete', array(
1643                                         $this->mTargetObj, $this->mFileVersions,
1644                                         $this->getUser(), $this->mComment ) );
1645                         }
1646
1647                         $link = Linker::linkKnown( $this->mTargetObj );
1648                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1649                 } else {
1650                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1651                 }
1652
1653                 // Show revision undeletion warnings and errors
1654                 $status = $archive->getRevisionStatus();
1655                 if ( $status && !$status->isGood() ) {
1656                         $out->addWikiText( '<div class="error">' .
1657                                 $status->getWikiText(
1658                                         'cannotundelete',
1659                                         'cannotundelete'
1660                                 ) . '</div>'
1661                         );
1662                 }
1663
1664                 // Show file undeletion warnings and errors
1665                 $status = $archive->getFileStatus();
1666                 if ( $status && !$status->isGood() ) {
1667                         $out->addWikiText( '<div class="error">' .
1668                                 $status->getWikiText(
1669                                         'undelete-error-short',
1670                                         'undelete-error-long'
1671                                 ) . '</div>'
1672                         );
1673                 }
1674         }
1675
1676         protected function getGroupName() {
1677                 return 'pagetools';
1678         }
1679 }