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          * @var Title
  32          */
  33         protected $title;
  34
  35         /**
  36          * @var Status
  37          */
  38         protected $fileStatus;
  39
  40         /**
  41          * @var Status
  42          */
  43         protected $revisionStatus;
  44
  45         function __construct( $title ) {
  46                 if ( is_null( $title ) ) {
  47                         throw new MWException( __METHOD__ . ' given a null title.' );
  48                 }
  49                 $this->title = $title;
  50         }
  51
  52         /**
  53          * List all deleted pages recorded in the archive table. Returns result
  54          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  55          * namespace/title.
  56          *
  57          * @return ResultWrapper
  58          */
  59         public static function listAllPages() {
  60                 $dbr = wfGetDB( DB_SLAVE );
  61
  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 string $prefix 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
  86                 $conds = array(
  87                         'ar_namespace' => $ns,
  88                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  89                 );
  90
  91                 return self::listPages( $dbr, $conds );
  92         }
  93
  94         /**
  95          * @param DatabaseBase $dbr
  96          * @param string|array $condition
  97          * @return bool|ResultWrapper
  98          */
  99         protected static function listPages( $dbr, $condition ) {
 100                 return $dbr->resultObject( $dbr->select(
 101                         array( 'archive' ),
 102                         array(
 103                                 'ar_namespace',
 104                                 'ar_title',
 105                                 'count' => 'COUNT(*)'
 106                         ),
 107                         $condition,
 108                         __METHOD__,
 109                         array(
 110                                 'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 111                                 'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 112                                 'LIMIT' => 100,
 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                 $tables = array( 'archive' );
 129
 130                 $fields = array(
 131                         'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 132                         'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1',
 133                 );
 134
 135                 if ( $wgContentHandlerUseDB ) {
 136                         $fields[] = 'ar_content_format';
 137                         $fields[] = 'ar_content_model';
 138                 }
 139
 140                 $conds = array( 'ar_namespace' => $this->title->getNamespace(),
 141                         'ar_title' => $this->title->getDBkey() );
 142
 143                 $options = array( 'ORDER BY' => 'ar_timestamp DESC' );
 144
 145                 $join_conds = array();
 146
 147                 ChangeTags::modifyDisplayQuery(
 148                         $tables,
 149                         $fields,
 150                         $conds,
 151                         $join_conds,
 152                         $options
 153                 );
 154
 155                 $res = $dbr->select( $tables,
 156                         $fields,
 157                         $conds,
 158                         __METHOD__,
 159                         $options,
 160                         $join_conds
 161                 );
 162
 163                 return $dbr->resultObject( $res );
 164         }
 165
 166         /**
 167          * List the deleted file revisions for this page, if it's a file page.
 168          * Returns a result wrapper with various filearchive fields, or null
 169          * if not a file page.
 170          *
 171          * @return ResultWrapper
 172          * @todo Does this belong in Image for fuller encapsulation?
 173          */
 174         function listFiles() {
 175                 if ( $this->title->getNamespace() != NS_FILE ) {
 176                         return null;
 177                 }
 178
 179                 $dbr = wfGetDB( DB_SLAVE );
 180                 $res = $dbr->select(
 181                         'filearchive',
 182                         ArchivedFile::selectFields(),
 183                         array( 'fa_name' => $this->title->getDBkey() ),
 184                         __METHOD__,
 185                         array( 'ORDER BY' => 'fa_timestamp DESC' )
 186                 );
 187
 188                 return $dbr->resultObject( $res );
 189         }
 190
 191         /**
 192          * Return a Revision object containing data for the deleted revision.
 193          * Note that the result *may* or *may not* have a null page ID.
 194          *
 195          * @param string $timestamp
 196          * @return Revision|null
 197          */
 198         function getRevision( $timestamp ) {
 199                 global $wgContentHandlerUseDB;
 200
 201                 $dbr = wfGetDB( DB_SLAVE );
 202
 203                 $fields = array(
 204                         'ar_rev_id',
 205                         'ar_text',
 206                         'ar_comment',
 207                         'ar_user',
 208                         'ar_user_text',
 209                         'ar_timestamp',
 210                         'ar_minor_edit',
 211                         'ar_flags',
 212                         'ar_text_id',
 213                         'ar_deleted',
 214                         'ar_len',
 215                         'ar_sha1',
 216                 );
 217
 218                 if ( $wgContentHandlerUseDB ) {
 219                         $fields[] = 'ar_content_format';
 220                         $fields[] = 'ar_content_model';
 221                 }
 222
 223                 $row = $dbr->selectRow( 'archive',
 224                         $fields,
 225                         array( 'ar_namespace' => $this->title->getNamespace(),
 226                                 'ar_title' => $this->title->getDBkey(),
 227                                 'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 228                         __METHOD__ );
 229
 230                 if ( $row ) {
 231                         return Revision::newFromArchiveRow( $row, array( 'title' => $this->title ) );
 232                 }
 233
 234                 return null;
 235         }
 236
 237         /**
 238          * Return the most-previous revision, either live or deleted, against
 239          * the deleted revision given by timestamp.
 240          *
 241          * May produce unexpected results in case of history merges or other
 242          * unusual time issues.
 243          *
 244          * @param string $timestamp
 245          * @return Revision|null Null when there is no previous revision
 246          */
 247         function getPreviousRevision( $timestamp ) {
 248                 $dbr = wfGetDB( DB_SLAVE );
 249
 250                 // Check the previous deleted revision...
 251                 $row = $dbr->selectRow( 'archive',
 252                         'ar_timestamp',
 253                         array( 'ar_namespace' => $this->title->getNamespace(),
 254                                 'ar_title' => $this->title->getDBkey(),
 255                                 'ar_timestamp < ' .
 256                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 257                         __METHOD__,
 258                         array(
 259                                 'ORDER BY' => 'ar_timestamp DESC',
 260                                 'LIMIT' => 1 ) );
 261                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 262
 263                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 264                         array( 'rev_id', 'rev_timestamp' ),
 265                         array(
 266                                 'page_namespace' => $this->title->getNamespace(),
 267                                 'page_title' => $this->title->getDBkey(),
 268                                 'page_id = rev_page',
 269                                 'rev_timestamp < ' .
 270                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 271                         __METHOD__,
 272                         array(
 273                                 'ORDER BY' => 'rev_timestamp DESC',
 274                                 'LIMIT' => 1 ) );
 275                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 276                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 277
 278                 if ( $prevLive && $prevLive > $prevDeleted ) {
 279                         // Most prior revision was live
 280                         return Revision::newFromId( $prevLiveId );
 281                 } elseif ( $prevDeleted ) {
 282                         // Most prior revision was deleted
 283                         return $this->getRevision( $prevDeleted );
 284                 }
 285
 286                 // No prior revision on this page.
 287                 return null;
 288         }
 289
 290         /**
 291          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 292          *
 293          * @param object $row Database row
 294          * @return string
 295          */
 296         function getTextFromRow( $row ) {
 297                 if ( is_null( $row->ar_text_id ) ) {
 298                         // An old row from MediaWiki 1.4 or previous.
 299                         // Text is embedded in this row in classic compression format.
 300                         return Revision::getRevisionText( $row, 'ar_' );
 301                 }
 302
 303                 // New-style: keyed to the text storage backend.
 304                 $dbr = wfGetDB( DB_SLAVE );
 305                 $text = $dbr->selectRow( 'text',
 306                         array( 'old_text', 'old_flags' ),
 307                         array( 'old_id' => $row->ar_text_id ),
 308                         __METHOD__ );
 309
 310                 return Revision::getRevisionText( $text );
 311         }
 312
 313         /**
 314          * Fetch (and decompress if necessary) the stored text of the most
 315          * recently edited deleted revision of the page.
 316          *
 317          * If there are no archived revisions for the page, returns NULL.
 318          *
 319          * @return string|null
 320          */
 321         function getLastRevisionText() {
 322                 $dbr = wfGetDB( DB_SLAVE );
 323                 $row = $dbr->selectRow( 'archive',
 324                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 325                         array( 'ar_namespace' => $this->title->getNamespace(),
 326                                 'ar_title' => $this->title->getDBkey() ),
 327                         __METHOD__,
 328                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 329
 330                 if ( $row ) {
 331                         return $this->getTextFromRow( $row );
 332                 }
 333
 334                 return null;
 335         }
 336
 337         /**
 338          * Quick check if any archived revisions are present for the page.
 339          *
 340          * @return boolean
 341          */
 342         function isDeleted() {
 343                 $dbr = wfGetDB( DB_SLAVE );
 344                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 345                         array( 'ar_namespace' => $this->title->getNamespace(),
 346                                 'ar_title' => $this->title->getDBkey() ),
 347                         __METHOD__
 348                 );
 349
 350                 return ( $n > 0 );
 351         }
 352
 353         /**
 354          * Restore the given (or all) text and file revisions for the page.
 355          * Once restored, the items will be removed from the archive tables.
 356          * The deletion log will be updated with an undeletion notice.
 357          *
 358          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 359          * @param string $comment
 360          * @param array $fileVersions
 361          * @param bool $unsuppress
 362          * @param User $user User performing the action, or null to use $wgUser
 363          *
 364          * @return array(number of file revisions restored, number of image revisions restored, log message)
 365          * on success, false on failure
 366          */
 367         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false, User $user = null ) {
 368                 // If both the set of text revisions and file revisions are empty,
 369                 // restore everything. Otherwise, just restore the requested items.
 370                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 371
 372                 $restoreText = $restoreAll || !empty( $timestamps );
 373                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 374
 375                 if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 376                         $img = wfLocalFile( $this->title );
 377                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 378                         if ( !$this->fileStatus->isOK() ) {
 379                                 return false;
 380                         }
 381                         $filesRestored = $this->fileStatus->successCount;
 382                 } else {
 383                         $filesRestored = 0;
 384                 }
 385
 386                 if ( $restoreText ) {
 387                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 388                         if ( !$this->revisionStatus->isOK() ) {
 389                                 return false;
 390                         }
 391
 392                         $textRestored = $this->revisionStatus->getValue();
 393                 } else {
 394                         $textRestored = 0;
 395                 }
 396
 397                 // Touch the log!
 398
 399                 if ( $textRestored && $filesRestored ) {
 400                         $reason = wfMessage( 'undeletedrevisions-files' )
 401                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 402                 } elseif ( $textRestored ) {
 403                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 404                                 ->inContentLanguage()->text();
 405                 } elseif ( $filesRestored ) {
 406                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 407                                 ->inContentLanguage()->text();
 408                 } else {
 409                         wfDebug( "Undelete: nothing undeleted...\n" );
 410
 411                         return false;
 412                 }
 413
 414                 if ( trim( $comment ) != '' ) {
 415                         $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
 416                 }
 417
 418                 if ( $user === null ) {
 419                         global $wgUser;
 420                         $user = $wgUser;
 421                 }
 422
 423                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 424                 $logEntry->setPerformer( $user );
 425                 $logEntry->setTarget( $this->title );
 426                 $logEntry->setComment( $reason );
 427
 428                 wfRunHooks( 'ArticleUndeleteLogEntry', array( $this, &$logEntry, $user ) );
 429
 430                 $logid = $logEntry->insert();
 431                 $logEntry->publish( $logid );
 432
 433                 return array( $textRestored, $filesRestored, $reason );
 434         }
 435
 436         /**
 437          * This is the meaty bit -- restores archived revisions of the given page
 438          * to the cur/old tables. If the page currently exists, all revisions will
 439          * be stuffed into old, otherwise the most recent will go into cur.
 440          *
 441          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 442          * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
 443          * @param string $comment
 444          * @throws ReadOnlyError
 445          * @return Status Object containing the number of revisions restored on success
 446          */
 447         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 448                 global $wgContentHandlerUseDB;
 449
 450                 if ( wfReadOnly() ) {
 451                         throw new ReadOnlyError();
 452                 }
 453
 454                 $restoreAll = empty( $timestamps );
 455                 $dbw = wfGetDB( DB_MASTER );
 456
 457                 # Does this page already exist? We'll have to update it...
 458                 $article = WikiPage::factory( $this->title );
 459                 # Load latest data for the current page (bug 31179)
 460                 $article->loadPageData( 'fromdbmaster' );
 461                 $oldcountable = $article->isCountable();
 462
 463                 $page = $dbw->selectRow( 'page',
 464                         array( 'page_id', 'page_latest' ),
 465                         array( 'page_namespace' => $this->title->getNamespace(),
 466                                 'page_title' => $this->title->getDBkey() ),
 467                         __METHOD__,
 468                         array( 'FOR UPDATE' ) // lock page
 469                 );
 470
 471                 if ( $page ) {
 472                         $makepage = false;
 473                         # Page already exists. Import the history, and if necessary
 474                         # we'll update the latest revision field in the record.
 475
 476                         $previousRevId = $page->page_latest;
 477
 478                         # Get the time span of this page
 479                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 480                                 array( 'rev_id' => $previousRevId ),
 481                                 __METHOD__ );
 482
 483                         if ( $previousTimestamp === false ) {
 484                                 wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
 485
 486                                 $status = Status::newGood( 0 );
 487                                 $status->warning( 'undeleterevision-missing' );
 488
 489                                 return $status;
 490                         }
 491                 } else {
 492                         # Have to create a new article...
 493                         $makepage = true;
 494                         $previousRevId = 0;
 495                         $previousTimestamp = 0;
 496                 }
 497
 498                 if ( $restoreAll ) {
 499                         $oldones = '1 = 1'; # All revisions...
 500                 } else {
 501                         $oldts = implode( ',',
 502                                 array_map( array( &$dbw, 'addQuotes' ),
 503                                         array_map( array( &$dbw, 'timestamp' ),
 504                                                 $timestamps ) ) );
 505
 506                         $oldones = "ar_timestamp IN ( {$oldts} )";
 507                 }
 508
 509                 $fields = array(
 510                         'ar_rev_id',
 511                         'ar_text',
 512                         'ar_comment',
 513                         'ar_user',
 514                         'ar_user_text',
 515                         'ar_timestamp',
 516                         'ar_minor_edit',
 517                         'ar_flags',
 518                         'ar_text_id',
 519                         'ar_deleted',
 520                         'ar_page_id',
 521                         'ar_len',
 522                         'ar_sha1'
 523                 );
 524
 525                 if ( $wgContentHandlerUseDB ) {
 526                         $fields[] = 'ar_content_format';
 527                         $fields[] = 'ar_content_model';
 528                 }
 529
 530                 /**
 531                  * Select each archived revision...
 532                  */
 533                 $result = $dbw->select( 'archive',
 534                         $fields,
 535                         /* WHERE */ array(
 536                                 'ar_namespace' => $this->title->getNamespace(),
 537                                 'ar_title' => $this->title->getDBkey(),
 538                                 $oldones ),
 539                         __METHOD__,
 540                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 541                 );
 542                 $ret = $dbw->resultObject( $result );
 543                 $rev_count = $dbw->numRows( $result );
 544
 545                 if ( !$rev_count ) {
 546                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 547
 548                         $status = Status::newGood( 0 );
 549                         $status->warning( "undelete-no-results" );
 550
 551                         return $status;
 552                 }
 553
 554                 $ret->seek( $rev_count - 1 ); // move to last
 555                 $row = $ret->fetchObject(); // get newest archived rev
 556                 $ret->seek( 0 ); // move back
 557
 558                 // grab the content to check consistency with global state before restoring the page.
 559                 $revision = Revision::newFromArchiveRow( $row,
 560                         array(
 561                                 'title' => $article->getTitle(), // used to derive default content model
 562                         )
 563                 );
 564                 $user = User::newFromName( $revision->getRawUserText(), false );
 565                 $content = $revision->getContent( Revision::RAW );
 566
 567                 //NOTE: article ID may not be known yet. prepareSave() should not modify the database.
 568                 $status = $content->prepareSave( $article, 0, -1, $user );
 569
 570                 if ( !$status->isOK() ) {
 571                         return $status;
 572                 }
 573
 574                 if ( $makepage ) {
 575                         // Check the state of the newest to-be version...
 576                         if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 577                                 return Status::newFatal( "undeleterevdel" );
 578                         }
 579                         // Safe to insert now...
 580                         $newid = $article->insertOn( $dbw );
 581                         $pageId = $newid;
 582                 } else {
 583                         // Check if a deleted revision will become the current revision...
 584                         if ( $row->ar_timestamp > $previousTimestamp ) {
 585                                 // Check the state of the newest to-be version...
 586                                 if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 587                                         return Status::newFatal( "undeleterevdel" );
 588                                 }
 589                         }
 590
 591                         $newid = false;
 592                         $pageId = $article->getId();
 593                 }
 594
 595                 $revision = null;
 596                 $restored = 0;
 597
 598                 foreach ( $ret as $row ) {
 599                         // Check for key dupes due to shitty archive integrity.
 600                         if ( $row->ar_rev_id ) {
 601                                 $exists = $dbw->selectField( 'revision', '1',
 602                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 603                                 if ( $exists ) {
 604                                         continue; // don't throw DB errors
 605                                 }
 606                         }
 607                         // Insert one revision at a time...maintaining deletion status
 608                         // unless we are specifically removing all restrictions...
 609                         $revision = Revision::newFromArchiveRow( $row,
 610                                 array(
 611                                         'page' => $pageId,
 612                                         'title' => $this->title,
 613                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 614                                 ) );
 615
 616                         $revision->insertOn( $dbw );
 617                         $restored++;
 618
 619                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 620                 }
 621                 # Now that it's safely stored, take it out of the archive
 622                 $dbw->delete( 'archive',
 623                         /* WHERE */ array(
 624                                 'ar_namespace' => $this->title->getNamespace(),
 625                                 'ar_title' => $this->title->getDBkey(),
 626                                 $oldones ),
 627                         __METHOD__ );
 628
 629                 // Was anything restored at all?
 630                 if ( $restored == 0 ) {
 631                         return Status::newGood( 0 );
 632                 }
 633
 634                 $created = (bool)$newid;
 635
 636                 // Attach the latest revision to the page...
 637                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 638                 if ( $created || $wasnew ) {
 639                         // Update site stats, link tables, etc
 640                         $user = User::newFromName( $revision->getRawUserText(), false );
 641                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 642                 }
 643
 644                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 645
 646                 if ( $this->title->getNamespace() == NS_FILE ) {
 647                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 648                         $update->doUpdate();
 649                 }
 650
 651                 return Status::newGood( $restored );
 652         }
 653
 654         /**
 655          * @return Status
 656          */
 657         function getFileStatus() {
 658                 return $this->fileStatus;
 659         }
 660
 661         /**
 662          * @return Status
 663          */
 664         function getRevisionStatus() {
 665                 return $this->revisionStatus;
 666         }
 667 }
 668
 669 /**
 670  * Special page allowing users with the appropriate permissions to view
 671  * and restore deleted content.
 672  *
 673  * @ingroup SpecialPage
 674  */
 675 class SpecialUndelete extends SpecialPage {
 676         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 677         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 678
 679         /**
 680          * @var Title
 681          */
 682         var $mTargetObj;
 683
 684         function __construct() {
 685                 parent::__construct( 'Undelete', 'deletedhistory' );
 686         }
 687
 688         function loadRequest( $par ) {
 689                 $request = $this->getRequest();
 690                 $user = $this->getUser();
 691
 692                 $this->mAction = $request->getVal( 'action' );
 693                 if ( $par !== null && $par !== '' ) {
 694                         $this->mTarget = $par;
 695                 } else {
 696                         $this->mTarget = $request->getVal( 'target' );
 697                 }
 698
 699                 $this->mTargetObj = null;
 700
 701                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 702                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 703                 }
 704
 705                 $this->mSearchPrefix = $request->getText( 'prefix' );
 706                 $time = $request->getVal( 'timestamp' );
 707                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 708                 $this->mFilename = $request->getVal( 'file' );
 709
 710                 $posted = $request->wasPosted() &&
 711                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 712                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 713                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 714                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 715                 $this->mDiff = $request->getCheck( 'diff' );
 716                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 717                 $this->mComment = $request->getText( 'wpComment' );
 718                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 719                 $this->mToken = $request->getVal( 'token' );
 720
 721                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 722                         $this->mAllowed = true; // user can restore
 723                         $this->mCanView = true; // user can view content
 724                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 725                         $this->mAllowed = false; // user cannot restore
 726                         $this->mCanView = true; // user can view content
 727                         $this->mRestore = false;
 728                 } else { // user can only view the list of revisions
 729                         $this->mAllowed = false;
 730                         $this->mCanView = false;
 731                         $this->mTimestamp = '';
 732                         $this->mRestore = false;
 733                 }
 734
 735                 if ( $this->mRestore || $this->mInvert ) {
 736                         $timestamps = array();
 737                         $this->mFileVersions = array();
 738                         foreach ( $request->getValues() as $key => $val ) {
 739                                 $matches = array();
 740                                 if ( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 741                                         array_push( $timestamps, $matches[1] );
 742                                 }
 743
 744                                 if ( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 745                                         $this->mFileVersions[] = intval( $matches[1] );
 746                                 }
 747                         }
 748                         rsort( $timestamps );
 749                         $this->mTargetTimestamp = $timestamps;
 750                 }
 751         }
 752
 753         function execute( $par ) {
 754                 $this->checkPermissions();
 755                 $user = $this->getUser();
 756
 757                 $this->setHeaders();
 758                 $this->outputHeader();
 759
 760                 $this->loadRequest( $par );
 761
 762                 $out = $this->getOutput();
 763
 764                 if ( is_null( $this->mTargetObj ) ) {
 765                         $out->addWikiMsg( 'undelete-header' );
 766
 767                         # Not all users can just browse every deleted page from the list
 768                         if ( $user->isAllowed( 'browsearchive' ) ) {
 769                                 $this->showSearchForm();
 770                         }
 771
 772                         return;
 773                 }
 774
 775                 if ( $this->mAllowed ) {
 776                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 777                 } else {
 778                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 779                 }
 780
 781                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 782
 783                 if ( $this->mTimestamp !== '' ) {
 784                         $this->showRevision( $this->mTimestamp );
 785                 } elseif ( $this->mFilename !== null && $this->mTargetObj->inNamespace( NS_FILE ) ) {
 786                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 787                         // Check if user is allowed to see this file
 788                         if ( !$file->exists() ) {
 789                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 790                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 791                                 if ( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 792                                         throw new PermissionsError( 'suppressrevision' );
 793                                 } else {
 794                                         throw new PermissionsError( 'deletedtext' );
 795                                 }
 796                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 797                                 $this->showFileConfirmationForm( $this->mFilename );
 798                         } else {
 799                                 $this->showFile( $this->mFilename );
 800                         }
 801                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 802                         $this->undelete();
 803                 } else {
 804                         $this->showHistory();
 805                 }
 806         }
 807
 808         function showSearchForm() {
 809                 global $wgScript;
 810
 811                 $out = $this->getOutput();
 812                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 813                 $out->addHTML(
 814                         Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) ) .
 815                                 Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 816                                 Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
 817                                 Html::rawElement(
 818                                         'label',
 819                                         array( 'for' => 'prefix' ),
 820                                         $this->msg( 'undelete-search-prefix' )->parse()
 821                                 ) .
 822                                 Xml::input(
 823                                         'prefix',
 824                                         20,
 825                                         $this->mSearchPrefix,
 826                                         array( 'id' => 'prefix', 'autofocus' => true )
 827                                 ) . ' ' .
 828                                 Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 829                                 Xml::closeElement( 'fieldset' ) .
 830                                 Xml::closeElement( 'form' )
 831                 );
 832
 833                 # List undeletable articles
 834                 if ( $this->mSearchPrefix ) {
 835                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 836                         $this->showList( $result );
 837                 }
 838         }
 839
 840         /**
 841          * Generic list of deleted pages
 842          *
 843          * @param ResultWrapper $result
 844          * @return bool
 845          */
 846         private function showList( $result ) {
 847                 $out = $this->getOutput();
 848
 849                 if ( $result->numRows() == 0 ) {
 850                         $out->addWikiMsg( 'undelete-no-results' );
 851
 852                         return false;
 853                 }
 854
 855                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 856
 857                 $undelete = $this->getPageTitle();
 858                 $out->addHTML( "<ul>\n" );
 859                 foreach ( $result as $row ) {
 860                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 861                         if ( $title !== null ) {
 862                                 $item = Linker::linkKnown(
 863                                         $undelete,
 864                                         htmlspecialchars( $title->getPrefixedText() ),
 865                                         array(),
 866                                         array( 'target' => $title->getPrefixedText() )
 867                                 );
 868                         } else {
 869                                 // The title is no longer valid, show as text
 870                                 $item = Html::element(
 871                                         'span',
 872                                         array( 'class' => 'mw-invalidtitle' ),
 873                                         Linker::getInvalidTitleDescription(
 874                                                 $this->getContext(),
 875                                                 $row->ar_namespace,
 876                                                 $row->ar_title
 877                                         )
 878                                 );
 879                         }
 880                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 881                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 882                 }
 883                 $result->free();
 884                 $out->addHTML( "</ul>\n" );
 885
 886                 return true;
 887         }
 888
 889         private function showRevision( $timestamp ) {
 890                 if ( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 891                         return;
 892                 }
 893
 894                 $archive = new PageArchive( $this->mTargetObj );
 895                 if ( !wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) ) ) {
 896                         return;
 897                 }
 898                 $rev = $archive->getRevision( $timestamp );
 899
 900                 $out = $this->getOutput();
 901                 $user = $this->getUser();
 902
 903                 if ( !$rev ) {
 904                         $out->addWikiMsg( 'undeleterevision-missing' );
 905
 906                         return;
 907                 }
 908
 909                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 910                         if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 911                                 $out->wrapWikiMsg(
 912                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 913                                         'rev-deleted-text-permission'
 914                                 );
 915
 916                                 return;
 917                         }
 918
 919                         $out->wrapWikiMsg(
 920                                 "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 921                                 'rev-deleted-text-view'
 922                         );
 923                         $out->addHTML( '<br />' );
 924                         // and we are allowed to see...
 925                 }
 926
 927                 if ( $this->mDiff ) {
 928                         $previousRev = $archive->getPreviousRevision( $timestamp );
 929                         if ( $previousRev ) {
 930                                 $this->showDiff( $previousRev, $rev );
 931                                 if ( $this->mDiffOnly ) {
 932                                         return;
 933                                 }
 934
 935                                 $out->addHTML( '<hr />' );
 936                         } else {
 937                                 $out->addWikiMsg( 'undelete-nodiff' );
 938                         }
 939                 }
 940
 941                 $link = Linker::linkKnown(
 942                         $this->getPageTitle( $this->mTargetObj->getPrefixedDBkey() ),
 943                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 944                 );
 945
 946                 $lang = $this->getLanguage();
 947
 948                 // date and time are separate parameters to facilitate localisation.
 949                 // $time is kept for backward compat reasons.
 950                 $time = $lang->userTimeAndDate( $timestamp, $user );
 951                 $d = $lang->userDate( $timestamp, $user );
 952                 $t = $lang->userTime( $timestamp, $user );
 953                 $userLink = Linker::revUserTools( $rev );
 954
 955                 $content = $rev->getContent( Revision::FOR_THIS_USER, $user );
 956
 957                 $isText = ( $content instanceof TextContent );
 958
 959                 if ( $this->mPreview || $isText ) {
 960                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 961                 } else {
 962                         $openDiv = '<div id="mw-undelete-revision">';
 963                 }
 964                 $out->addHTML( $openDiv );
 965
 966                 // Revision delete links
 967                 if ( !$this->mDiff ) {
 968                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 969                         if ( $revdel ) {
 970                                 $out->addHTML( "$revdel " );
 971                         }
 972                 }
 973
 974                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 975                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 976
 977                 if ( !wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) ) ) {
 978                         return;
 979                 }
 980
 981                 if ( $this->mPreview || !$isText ) {
 982                         // NOTE: non-text content has no source view, so always use rendered preview
 983
 984                         // Hide [edit]s
 985                         $popts = $out->parserOptions();
 986                         $popts->setEditSection( false );
 987
 988                         $pout = $content->getParserOutput( $this->mTargetObj, $rev->getId(), $popts, true );
 989                         $out->addParserOutput( $pout );
 990                 }
 991
 992                 if ( $isText ) {
 993                         // source view for textual content
 994                         $sourceView = Xml::element(
 995                                 'textarea',
 996                                 array(
 997                                         'readonly' => 'readonly',
 998                                         'cols' => $user->getIntOption( 'cols' ),
 999                                         'rows' => $user->getIntOption( 'rows' )
1000                                 ),
1001                                 $content->getNativeData() . "\n"
1002                         );
1003
1004                         $previewButton = Xml::element( 'input', array(
1005                                 'type' => 'submit',
1006                                 'name' => 'preview',
1007                                 'value' => $this->msg( 'showpreview' )->text()
1008                         ) );
1009                 } else {
1010                         $sourceView = '';
1011                         $previewButton = '';
1012                 }
1013
1014                 $diffButton = Xml::element( 'input', array(
1015                         'name' => 'diff',
1016                         'type' => 'submit',
1017                         'value' => $this->msg( 'showdiff' )->text() ) );
1018
1019                 $out->addHTML(
1020                         $sourceView .
1021                                 Xml::openElement( 'div', array(
1022                                         'style' => 'clear: both' ) ) .
1023                                 Xml::openElement( 'form', array(
1024                                         'method' => 'post',
1025                                         'action' => $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
1026                                 Xml::element( 'input', array(
1027                                         'type' => 'hidden',
1028                                         'name' => 'target',
1029                                         'value' => $this->mTargetObj->getPrefixedDBkey() ) ) .
1030                                 Xml::element( 'input', array(
1031                                         'type' => 'hidden',
1032                                         'name' => 'timestamp',
1033                                         'value' => $timestamp ) ) .
1034                                 Xml::element( 'input', array(
1035                                         'type' => 'hidden',
1036                                         'name' => 'wpEditToken',
1037                                         'value' => $user->getEditToken() ) ) .
1038                                 $previewButton .
1039                                 $diffButton .
1040                                 Xml::closeElement( 'form' ) .
1041                                 Xml::closeElement( 'div' )
1042                 );
1043         }
1044
1045         /**
1046          * Build a diff display between this and the previous either deleted
1047          * or non-deleted edit.
1048          *
1049          * @param Revision $previousRev
1050          * @param Revision $currentRev
1051          * @return string HTML
1052          */
1053         function showDiff( $previousRev, $currentRev ) {
1054                 $diffContext = clone $this->getContext();
1055                 $diffContext->setTitle( $currentRev->getTitle() );
1056                 $diffContext->setWikiPage( WikiPage::factory( $currentRev->getTitle() ) );
1057
1058                 $diffEngine = $currentRev->getContentHandler()->createDifferenceEngine( $diffContext );
1059                 $diffEngine->showDiffStyle();
1060
1061                 $formattedDiff = $diffEngine->generateContentDiffBody(
1062                         $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
1063                         $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() )
1064                 );
1065
1066                 $formattedDiff = $diffEngine->addHeader(
1067                         $formattedDiff,
1068                         $this->diffHeader( $previousRev, 'o' ),
1069                         $this->diffHeader( $currentRev, 'n' )
1070                 );
1071
1072                 $this->getOutput()->addHTML( "<div>$formattedDiff</div>\n" );
1073         }
1074
1075         /**
1076          * @param Revision $rev
1077          * @param string $prefix
1078          * @return string
1079          */
1080         private function diffHeader( $rev, $prefix ) {
1081                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
1082                 if ( $isDeleted ) {
1083                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
1084                         $targetPage = $this->getPageTitle();
1085                         $targetQuery = array(
1086                                 'target' => $this->mTargetObj->getPrefixedText(),
1087                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
1088                         );
1089                 } else {
1090                         /// @todo FIXME: getId() may return non-zero for deleted revs...
1091                         $targetPage = $rev->getTitle();
1092                         $targetQuery = array( 'oldid' => $rev->getId() );
1093                 }
1094
1095                 // Add show/hide deletion links if available
1096                 $user = $this->getUser();
1097                 $lang = $this->getLanguage();
1098                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1099
1100                 if ( $rdel ) {
1101                         $rdel = " $rdel";
1102                 }
1103
1104                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1105
1106                 $tags = wfGetDB( DB_SLAVE )->selectField(
1107                         'tag_summary',
1108                         'ts_tags',
1109                         array( 'ts_rev_id' => $rev->getId() ),
1110                         __METHOD__
1111                 );
1112                 $tagSummary = ChangeTags::formatSummaryRow( $tags, 'deleteddiff' );
1113
1114                 // FIXME This is reimplementing DifferenceEngine#getRevisionHeader
1115                 // and partially #showDiffPage, but worse
1116                 return '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1117                         Linker::link(
1118                                 $targetPage,
1119                                 $this->msg(
1120                                         'revisionasof',
1121                                         $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
1122                                         $lang->userDate( $rev->getTimestamp(), $user ),
1123                                         $lang->userTime( $rev->getTimestamp(), $user )
1124                                 )->escaped(),
1125                                 array(),
1126                                 $targetQuery
1127                         ) .
1128                         '</strong></div>' .
1129                         '<div id="mw-diff-' . $prefix . 'title2">' .
1130                         Linker::revUserTools( $rev ) . '<br />' .
1131                         '</div>' .
1132                         '<div id="mw-diff-' . $prefix . 'title3">' .
1133                         $minor . Linker::revComment( $rev ) . $rdel . '<br />' .
1134                         '</div>' .
1135                         '<div id="mw-diff-' . $prefix . 'title5">' .
1136                         $tagSummary[0] . '<br />' .
1137                         '</div>';
1138         }
1139
1140         /**
1141          * Show a form confirming whether a tokenless user really wants to see a file
1142          */
1143         private function showFileConfirmationForm( $key ) {
1144                 $out = $this->getOutput();
1145                 $lang = $this->getLanguage();
1146                 $user = $this->getUser();
1147                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1148                 $out->addWikiMsg( 'undelete-show-file-confirm',
1149                         $this->mTargetObj->getText(),
1150                         $lang->userDate( $file->getTimestamp(), $user ),
1151                         $lang->userTime( $file->getTimestamp(), $user ) );
1152                 $out->addHTML(
1153                         Xml::openElement( 'form', array(
1154                                         'method' => 'POST',
1155                                         'action' => $this->getPageTitle()->getLocalURL( array(
1156                                                 'target' => $this->mTarget,
1157                                                 'file' => $key,
1158                                                 'token' => $user->getEditToken( $key ),
1159                                         ) ),
1160                                 )
1161                         ) .
1162                                 Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1163                                 '</form>'
1164                 );
1165         }
1166
1167         /**
1168          * Show a deleted file version requested by the visitor.
1169          */
1170         private function showFile( $key ) {
1171                 $this->getOutput()->disable();
1172
1173                 # We mustn't allow the output to be Squid cached, otherwise
1174                 # if an admin previews a deleted image, and it's cached, then
1175                 # a user without appropriate permissions can toddle off and
1176                 # nab the image, and Squid will serve it
1177                 $response = $this->getRequest()->response();
1178                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1179                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1180                 $response->header( 'Pragma: no-cache' );
1181
1182                 $repo = RepoGroup::singleton()->getLocalRepo();
1183                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1184                 $repo->streamFile( $path );
1185         }
1186
1187         private function showHistory() {
1188                 $out = $this->getOutput();
1189                 if ( $this->mAllowed ) {
1190                         $out->addModules( 'mediawiki.special.undelete' );
1191                 }
1192                 $out->wrapWikiMsg(
1193                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1194                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1195                 );
1196
1197                 $archive = new PageArchive( $this->mTargetObj );
1198                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1199                 /*
1200                 $text = $archive->getLastRevisionText();
1201                 if( is_null( $text ) ) {
1202                         $out->addWikiMsg( 'nohistory' );
1203                         return;
1204                 }
1205                 */
1206                 $out->addHTML( '<div class="mw-undelete-history">' );
1207                 if ( $this->mAllowed ) {
1208                         $out->addWikiMsg( 'undeletehistory' );
1209                         $out->addWikiMsg( 'undeleterevdel' );
1210                 } else {
1211                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1212                 }
1213                 $out->addHTML( '</div>' );
1214
1215                 # List all stored revisions
1216                 $revisions = $archive->listRevisions();
1217                 $files = $archive->listFiles();
1218
1219                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1220                 $haveFiles = $files && $files->numRows() > 0;
1221
1222                 # Batch existence check on user and talk pages
1223                 if ( $haveRevisions ) {
1224                         $batch = new LinkBatch();
1225                         foreach ( $revisions as $row ) {
1226                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1227                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1228                         }
1229                         $batch->execute();
1230                         $revisions->seek( 0 );
1231                 }
1232                 if ( $haveFiles ) {
1233                         $batch = new LinkBatch();
1234                         foreach ( $files as $row ) {
1235                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1236                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1237                         }
1238                         $batch->execute();
1239                         $files->seek( 0 );
1240                 }
1241
1242                 if ( $this->mAllowed ) {
1243                         $action = $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) );
1244                         # Start the form here
1245                         $top = Xml::openElement(
1246                                 'form',
1247                                 array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' )
1248                         );
1249                         $out->addHTML( $top );
1250                 }
1251
1252                 # Show relevant lines from the deletion log:
1253                 $deleteLogPage = new LogPage( 'delete' );
1254                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1255                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1256                 # Show relevant lines from the suppression log:
1257                 $suppressLogPage = new LogPage( 'suppress' );
1258                 if ( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1259                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1260                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1261                 }
1262
1263                 if ( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1264                         # Format the user-visible controls (comment field, submission button)
1265                         # in a nice little table
1266                         if ( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1267                                 $unsuppressBox =
1268                                         "<tr>
1269                                                 <td>&#160;</td>
1270                                                 <td class='mw-input'>" .
1271                                                 Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1272                                                         'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ) .
1273                                                 "</td>
1274                                         </tr>";
1275                         } else {
1276                                 $unsuppressBox = '';
1277                         }
1278
1279                         $table = Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1280                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1281                                 "<tr>
1282                                         <td colspan='2' class='mw-undelete-extrahelp'>" .
1283                                 $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1284                                 "</td>
1285                         </tr>
1286                         <tr>
1287                                 <td class='mw-label'>" .
1288                                 Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1289                                 "</td>
1290                                 <td class='mw-input'>" .
1291                                 Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment', 'autofocus' => true ) ) .
1292                                 "</td>
1293                         </tr>
1294                         <tr>
1295                                 <td>&#160;</td>
1296                                 <td class='mw-submit'>" .
1297                                 Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1298                                 Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1299                                 "</td>
1300                         </tr>" .
1301                                 $unsuppressBox .
1302                                 Xml::closeElement( 'table' ) .
1303                                 Xml::closeElement( 'fieldset' );
1304
1305                         $out->addHTML( $table );
1306                 }
1307
1308                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1309
1310                 if ( $haveRevisions ) {
1311                         # The page's stored (deleted) history:
1312                         $out->addHTML( '<ul>' );
1313                         $remaining = $revisions->numRows();
1314                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1315
1316                         foreach ( $revisions as $row ) {
1317                                 $remaining--;
1318                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1319                         }
1320                         $revisions->free();
1321                         $out->addHTML( '</ul>' );
1322                 } else {
1323                         $out->addWikiMsg( 'nohistory' );
1324                 }
1325
1326                 if ( $haveFiles ) {
1327                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1328                         $out->addHTML( '<ul>' );
1329                         foreach ( $files as $row ) {
1330                                 $out->addHTML( $this->formatFileRow( $row ) );
1331                         }
1332                         $files->free();
1333                         $out->addHTML( '</ul>' );
1334                 }
1335
1336                 if ( $this->mAllowed ) {
1337                         # Slip in the hidden controls here
1338                         $misc = Html::hidden( 'target', $this->mTarget );
1339                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1340                         $misc .= Xml::closeElement( 'form' );
1341                         $out->addHTML( $misc );
1342                 }
1343
1344                 return true;
1345         }
1346
1347         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1348                 $rev = Revision::newFromArchiveRow( $row,
1349                         array(
1350                                 'title' => $this->mTargetObj
1351                         ) );
1352
1353                 $revTextSize = '';
1354                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1355                 // Build checkboxen...
1356                 if ( $this->mAllowed ) {
1357                         if ( $this->mInvert ) {
1358                                 if ( in_array( $ts, $this->mTargetTimestamp ) ) {
1359                                         $checkBox = Xml::check( "ts$ts" );
1360                                 } else {
1361                                         $checkBox = Xml::check( "ts$ts", true );
1362                                 }
1363                         } else {
1364                                 $checkBox = Xml::check( "ts$ts" );
1365                         }
1366                 } else {
1367                         $checkBox = '';
1368                 }
1369
1370                 // Build page & diff links...
1371                 $user = $this->getUser();
1372                 if ( $this->mCanView ) {
1373                         $titleObj = $this->getPageTitle();
1374                         # Last link
1375                         if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1376                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1377                                 $last = $this->msg( 'diff' )->escaped();
1378                         } elseif ( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1379                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1380                                 $last = Linker::linkKnown(
1381                                         $titleObj,
1382                                         $this->msg( 'diff' )->escaped(),
1383                                         array(),
1384                                         array(
1385                                                 'target' => $this->mTargetObj->getPrefixedText(),
1386                                                 'timestamp' => $ts,
1387                                                 'diff' => 'prev'
1388                                         )
1389                                 );
1390                         } else {
1391                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1392                                 $last = $this->msg( 'diff' )->escaped();
1393                         }
1394                 } else {
1395                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1396                         $last = $this->msg( 'diff' )->escaped();
1397                 }
1398
1399                 // User links
1400                 $userLink = Linker::revUserTools( $rev );
1401
1402                 // Minor edit
1403                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1404
1405                 // Revision text size
1406                 $size = $row->ar_len;
1407                 if ( !is_null( $size ) ) {
1408                         $revTextSize = Linker::formatRevisionSize( $size );
1409                 }
1410
1411                 // Edit summary
1412                 $comment = Linker::revComment( $rev );
1413
1414                 // Tags
1415                 $attribs = array();
1416                 list( $tagSummary, $classes ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'deletedhistory' );
1417                 if ( $classes ) {
1418                         $attribs['class'] = implode( ' ', $classes );
1419                 }
1420
1421                 // Revision delete links
1422                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1423
1424                 $revisionRow = $this->msg( 'undelete-revision-row' )
1425                         ->rawParams( $checkBox, $revdlink, $last, $pageLink, $userLink, $minor, $revTextSize, $comment, $tagSummary )
1426                         ->escaped();
1427
1428                 return Xml::tags( 'li', $attribs, $revisionRow ) . "\n";
1429         }
1430
1431         private function formatFileRow( $row ) {
1432                 $file = ArchivedFile::newFromRow( $row );
1433                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1434                 $user = $this->getUser();
1435
1436                 if ( $this->mAllowed && $row->fa_storage_key ) {
1437                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1438                         $key = urlencode( $row->fa_storage_key );
1439                         $pageLink = $this->getFileLink( $file, $this->getPageTitle(), $ts, $key );
1440                 } else {
1441                         $checkBox = '';
1442                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1443                 }
1444                 $userLink = $this->getFileUser( $file );
1445                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1446                 $bytes = $this->msg( 'parentheses' )
1447                         ->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )
1448                         ->plain();
1449                 $data = htmlspecialchars( $data . ' ' . $bytes );
1450                 $comment = $this->getFileComment( $file );
1451
1452                 // Add show/hide deletion links if available
1453                 $canHide = $user->isAllowed( 'deleterevision' );
1454                 if ( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1455                         if ( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1456                                 // Revision was hidden from sysops
1457                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide );
1458                         } else {
1459                                 $query = array(
1460                                         'type' => 'filearchive',
1461                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1462                                         'ids' => $row->fa_id
1463                                 );
1464                                 $revdlink = Linker::revDeleteLink( $query,
1465                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1466                         }
1467                 } else {
1468                         $revdlink = '';
1469                 }
1470
1471                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1472         }
1473
1474         /**
1475          * Fetch revision text link if it's available to all users
1476          *
1477          * @param Revision $rev
1478          * @param Title $titleObj
1479          * @param string $ts Timestamp
1480          * @return string
1481          */
1482         function getPageLink( $rev, $titleObj, $ts ) {
1483                 $user = $this->getUser();
1484                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1485
1486                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1487                         return '<span class="history-deleted">' . $time . '</span>';
1488                 }
1489
1490                 $link = Linker::linkKnown(
1491                         $titleObj,
1492                         htmlspecialchars( $time ),
1493                         array(),
1494                         array(
1495                                 'target' => $this->mTargetObj->getPrefixedText(),
1496                                 'timestamp' => $ts
1497                         )
1498                 );
1499
1500                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1501                         $link = '<span class="history-deleted">' . $link . '</span>';
1502                 }
1503
1504                 return $link;
1505         }
1506
1507         /**
1508          * Fetch image view link if it's available to all users
1509          *
1510          * @param File|ArchivedFile $file
1511          * @param Title $titleObj
1512          * @param string $ts A timestamp
1513          * @param string $key a storage key
1514          *
1515          * @return string HTML fragment
1516          */
1517         function getFileLink( $file, $titleObj, $ts, $key ) {
1518                 $user = $this->getUser();
1519                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1520
1521                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1522                         return '<span class="history-deleted">' . $time . '</span>';
1523                 }
1524
1525                 $link = Linker::linkKnown(
1526                         $titleObj,
1527                         htmlspecialchars( $time ),
1528                         array(),
1529                         array(
1530                                 'target' => $this->mTargetObj->getPrefixedText(),
1531                                 'file' => $key,
1532                                 'token' => $user->getEditToken( $key )
1533                         )
1534                 );
1535
1536                 if ( $file->isDeleted( File::DELETED_FILE ) ) {
1537                         $link = '<span class="history-deleted">' . $link . '</span>';
1538                 }
1539
1540                 return $link;
1541         }
1542
1543         /**
1544          * Fetch file's user id if it's available to this user
1545          *
1546          * @param File|ArchivedFile $file
1547          * @return string HTML fragment
1548          */
1549         function getFileUser( $file ) {
1550                 if ( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1551                         return '<span class="history-deleted">' .
1552                                 $this->msg( 'rev-deleted-user' )->escaped() .
1553                                 '</span>';
1554                 }
1555
1556                 $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1557                         Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1558
1559                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1560                         $link = '<span class="history-deleted">' . $link . '</span>';
1561                 }
1562
1563                 return $link;
1564         }
1565
1566         /**
1567          * Fetch file upload comment if it's available to this user
1568          *
1569          * @param File|ArchivedFile $file
1570          * @return string HTML fragment
1571          */
1572         function getFileComment( $file ) {
1573                 if ( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1574                         return '<span class="history-deleted"><span class="comment">' .
1575                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1576                 }
1577
1578                 $link = Linker::commentBlock( $file->getRawDescription() );
1579
1580                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1581                         $link = '<span class="history-deleted">' . $link . '</span>';
1582                 }
1583
1584                 return $link;
1585         }
1586
1587         function undelete() {
1588                 global $wgUploadMaintenance;
1589
1590                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1591                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1592                 }
1593
1594                 if ( wfReadOnly() ) {
1595                         throw new ReadOnlyError;
1596                 }
1597
1598                 $out = $this->getOutput();
1599                 $archive = new PageArchive( $this->mTargetObj );
1600                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1601                 $ok = $archive->undelete(
1602                         $this->mTargetTimestamp,
1603                         $this->mComment,
1604                         $this->mFileVersions,
1605                         $this->mUnsuppress,
1606                         $this->getUser()
1607                 );
1608
1609                 if ( is_array( $ok ) ) {
1610                         if ( $ok[1] ) { // Undeleted file count
1611                                 wfRunHooks( 'FileUndeleteComplete', array(
1612                                         $this->mTargetObj, $this->mFileVersions,
1613                                         $this->getUser(), $this->mComment ) );
1614                         }
1615
1616                         $link = Linker::linkKnown( $this->mTargetObj );
1617                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1618                 } else {
1619                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1620                 }
1621
1622                 // Show revision undeletion warnings and errors
1623                 $status = $archive->getRevisionStatus();
1624                 if ( $status && !$status->isGood() ) {
1625                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'cannotundelete', 'cannotundelete' ) . '</div>' );
1626                 }
1627
1628                 // Show file undeletion warnings and errors
1629                 $status = $archive->getFileStatus();
1630                 if ( $status && !$status->isGood() ) {
1631                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1632                 }
1633         }
1634
1635         protected function getGroupName() {
1636                 return 'pagetools';
1637         }
1638 }