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                 return self::listPages( $dbr, '' );
  62         }
  63
  64         /**
  65          * List deleted pages recorded in the archive table matching the
  66          * given title prefix.
  67          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  68          *
  69          * @param string $prefix Title prefix
  70          * @return ResultWrapper
  71          */
  72         public static function listPagesByPrefix( $prefix ) {
  73                 $dbr = wfGetDB( DB_SLAVE );
  74
  75                 $title = Title::newFromText( $prefix );
  76                 if ( $title ) {
  77                         $ns = $title->getNamespace();
  78                         $prefix = $title->getDBkey();
  79                 } else {
  80                         // Prolly won't work too good
  81                         // @todo handle bare namespace names cleanly?
  82                         $ns = 0;
  83                 }
  84
  85                 $conds = array(
  86                         'ar_namespace' => $ns,
  87                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  88                 );
  89
  90                 return self::listPages( $dbr, $conds );
  91         }
  92
  93         /**
  94          * @param DatabaseBase $dbr
  95          * @param string|array $condition
  96          * @return bool|ResultWrapper
  97          */
  98         protected static function listPages( $dbr, $condition ) {
  99                 return $dbr->resultObject( $dbr->select(
 100                         array( 'archive' ),
 101                         array(
 102                                 'ar_namespace',
 103                                 'ar_title',
 104                                 'count' => 'COUNT(*)'
 105                         ),
 106                         $condition,
 107                         __METHOD__,
 108                         array(
 109                                 'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 110                                 'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 111                                 'LIMIT' => 100,
 112                         )
 113                 ) );
 114         }
 115
 116         /**
 117          * List the revisions of the given page. Returns result wrapper with
 118          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 119          *
 120          * @return ResultWrapper
 121          */
 122         function listRevisions() {
 123                 global $wgContentHandlerUseDB;
 124
 125                 $dbr = wfGetDB( DB_SLAVE );
 126
 127                 $tables = array( 'archive' );
 128
 129                 $fields = array(
 130                         'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 131                         'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1',
 132                 );
 133
 134                 if ( $wgContentHandlerUseDB ) {
 135                         $fields[] = 'ar_content_format';
 136                         $fields[] = 'ar_content_model';
 137                 }
 138
 139                 $conds = array( 'ar_namespace' => $this->title->getNamespace(),
 140                                 'ar_title' => $this->title->getDBkey() );
 141
 142                 $options = array( 'ORDER BY' => 'ar_timestamp DESC' );
 143
 144                 $join_conds = array();
 145
 146                 ChangeTags::modifyDisplayQuery(
 147                         $tables,
 148                         $fields,
 149                         $conds,
 150                         $join_conds,
 151                         $options
 152                 );
 153
 154                 $res = $dbr->select( $tables,
 155                         $fields,
 156                         $conds,
 157                         __METHOD__,
 158                         $options,
 159                         $join_conds
 160                 );
 161
 162                 return $dbr->resultObject( $res );
 163         }
 164
 165         /**
 166          * List the deleted file revisions for this page, if it's a file page.
 167          * Returns a result wrapper with various filearchive fields, or null
 168          * if not a file page.
 169          *
 170          * @return ResultWrapper
 171          * @todo Does this belong in Image for fuller encapsulation?
 172          */
 173         function listFiles() {
 174                 if ( $this->title->getNamespace() != NS_FILE ) {
 175                         return null;
 176                 }
 177
 178                 $dbr = wfGetDB( DB_SLAVE );
 179                 $res = $dbr->select(
 180                         'filearchive',
 181                         ArchivedFile::selectFields(),
 182                         array( 'fa_name' => $this->title->getDBkey() ),
 183                         __METHOD__,
 184                         array( 'ORDER BY' => 'fa_timestamp DESC' )
 185                 );
 186
 187                 return $dbr->resultObject( $res );
 188         }
 189
 190         /**
 191          * Return a Revision object containing data for the deleted revision.
 192          * Note that the result *may* or *may not* have a null page ID.
 193          *
 194          * @param string $timestamp
 195          * @return Revision|null
 196          */
 197         function getRevision( $timestamp ) {
 198                 global $wgContentHandlerUseDB;
 199
 200                 $dbr = wfGetDB( DB_SLAVE );
 201
 202                 $fields = array(
 203                         'ar_rev_id',
 204                         'ar_text',
 205                         'ar_comment',
 206                         'ar_user',
 207                         'ar_user_text',
 208                         'ar_timestamp',
 209                         'ar_minor_edit',
 210                         'ar_flags',
 211                         'ar_text_id',
 212                         'ar_deleted',
 213                         'ar_len',
 214                         'ar_sha1',
 215                 );
 216
 217                 if ( $wgContentHandlerUseDB ) {
 218                         $fields[] = 'ar_content_format';
 219                         $fields[] = 'ar_content_model';
 220                 }
 221
 222                 $row = $dbr->selectRow( 'archive',
 223                         $fields,
 224                         array( 'ar_namespace' => $this->title->getNamespace(),
 225                                 'ar_title' => $this->title->getDBkey(),
 226                                 'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 227                         __METHOD__ );
 228
 229                 if ( $row ) {
 230                         return Revision::newFromArchiveRow( $row, array( 'title' => $this->title ) );
 231                 }
 232
 233                 return null;
 234         }
 235
 236         /**
 237          * Return the most-previous revision, either live or deleted, against
 238          * the deleted revision given by timestamp.
 239          *
 240          * May produce unexpected results in case of history merges or other
 241          * unusual time issues.
 242          *
 243          * @param string $timestamp
 244          * @return Revision|null Null when there is no previous revision
 245          */
 246         function getPreviousRevision( $timestamp ) {
 247                 $dbr = wfGetDB( DB_SLAVE );
 248
 249                 // Check the previous deleted revision...
 250                 $row = $dbr->selectRow( 'archive',
 251                         'ar_timestamp',
 252                         array( 'ar_namespace' => $this->title->getNamespace(),
 253                                 'ar_title' => $this->title->getDBkey(),
 254                                 'ar_timestamp < ' .
 255                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 256                         __METHOD__,
 257                         array(
 258                                 'ORDER BY' => 'ar_timestamp DESC',
 259                                 'LIMIT' => 1 ) );
 260                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 261
 262                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 263                         array( 'rev_id', 'rev_timestamp' ),
 264                         array(
 265                                 'page_namespace' => $this->title->getNamespace(),
 266                                 'page_title' => $this->title->getDBkey(),
 267                                 'page_id = rev_page',
 268                                 'rev_timestamp < ' .
 269                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 270                         __METHOD__,
 271                         array(
 272                                 'ORDER BY' => 'rev_timestamp DESC',
 273                                 'LIMIT' => 1 ) );
 274                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 275                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 276
 277                 if ( $prevLive && $prevLive > $prevDeleted ) {
 278                         // Most prior revision was live
 279                         return Revision::newFromId( $prevLiveId );
 280                 } elseif ( $prevDeleted ) {
 281                         // Most prior revision was deleted
 282                         return $this->getRevision( $prevDeleted );
 283                 }
 284
 285                 // No prior revision on this page.
 286                 return null;
 287         }
 288
 289         /**
 290          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 291          *
 292          * @param object $row Database row
 293          * @return string
 294          */
 295         function getTextFromRow( $row ) {
 296                 if ( is_null( $row->ar_text_id ) ) {
 297                         // An old row from MediaWiki 1.4 or previous.
 298                         // Text is embedded in this row in classic compression format.
 299                         return Revision::getRevisionText( $row, 'ar_' );
 300                 }
 301
 302                 // New-style: keyed to the text storage backend.
 303                 $dbr = wfGetDB( DB_SLAVE );
 304                 $text = $dbr->selectRow( 'text',
 305                         array( 'old_text', 'old_flags' ),
 306                         array( 'old_id' => $row->ar_text_id ),
 307                         __METHOD__ );
 308
 309                 return Revision::getRevisionText( $text );
 310         }
 311
 312         /**
 313          * Fetch (and decompress if necessary) the stored text of the most
 314          * recently edited deleted revision of the page.
 315          *
 316          * If there are no archived revisions for the page, returns NULL.
 317          *
 318          * @return string|null
 319          */
 320         function getLastRevisionText() {
 321                 $dbr = wfGetDB( DB_SLAVE );
 322                 $row = $dbr->selectRow( 'archive',
 323                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 324                         array( 'ar_namespace' => $this->title->getNamespace(),
 325                                 'ar_title' => $this->title->getDBkey() ),
 326                         __METHOD__,
 327                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 328
 329                 if ( $row ) {
 330                         return $this->getTextFromRow( $row );
 331                 }
 332
 333                 return null;
 334         }
 335
 336         /**
 337          * Quick check if any archived revisions are present for the page.
 338          *
 339          * @return boolean
 340          */
 341         function isDeleted() {
 342                 $dbr = wfGetDB( DB_SLAVE );
 343                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 344                         array( 'ar_namespace' => $this->title->getNamespace(),
 345                                 'ar_title' => $this->title->getDBkey() ),
 346                         __METHOD__
 347                 );
 348
 349                 return ( $n > 0 );
 350         }
 351
 352         /**
 353          * Restore the given (or all) text and file revisions for the page.
 354          * Once restored, the items will be removed from the archive tables.
 355          * The deletion log will be updated with an undeletion notice.
 356          *
 357          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 358          * @param string $comment
 359          * @param array $fileVersions
 360          * @param bool $unsuppress
 361          * @param User $user User performing the action, or null to use $wgUser
 362          *
 363          * @return array(number of file revisions restored, number of image revisions restored, log message)
 364          * on success, false on failure
 365          */
 366         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false, User $user = null ) {
 367                 // If both the set of text revisions and file revisions are empty,
 368                 // restore everything. Otherwise, just restore the requested items.
 369                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 370
 371                 $restoreText = $restoreAll || !empty( $timestamps );
 372                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 373
 374                 if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 375                         $img = wfLocalFile( $this->title );
 376                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 377                         if ( !$this->fileStatus->isOK() ) {
 378                                 return false;
 379                         }
 380                         $filesRestored = $this->fileStatus->successCount;
 381                 } else {
 382                         $filesRestored = 0;
 383                 }
 384
 385                 if ( $restoreText ) {
 386                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 387                         if ( !$this->revisionStatus->isOK() ) {
 388                                 return false;
 389                         }
 390
 391                         $textRestored = $this->revisionStatus->getValue();
 392                 } else {
 393                         $textRestored = 0;
 394                 }
 395
 396                 // Touch the log!
 397
 398                 if ( $textRestored && $filesRestored ) {
 399                         $reason = wfMessage( 'undeletedrevisions-files' )
 400                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 401                 } elseif ( $textRestored ) {
 402                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 403                                 ->inContentLanguage()->text();
 404                 } elseif ( $filesRestored ) {
 405                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 406                                 ->inContentLanguage()->text();
 407                 } else {
 408                         wfDebug( "Undelete: nothing undeleted...\n" );
 409                         return false;
 410                 }
 411
 412                 if ( trim( $comment ) != '' ) {
 413                         $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
 414                 }
 415
 416                 if ( $user === null ) {
 417                         global $wgUser;
 418                         $user = $wgUser;
 419                 }
 420
 421                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 422                 $logEntry->setPerformer( $user );
 423                 $logEntry->setTarget( $this->title );
 424                 $logEntry->setComment( $reason );
 425
 426                 wfRunHooks( 'ArticleUndeleteLogEntry', array( $this, &$logEntry, $user ) );
 427
 428                 $logid = $logEntry->insert();
 429                 $logEntry->publish( $logid );
 430
 431                 return array( $textRestored, $filesRestored, $reason );
 432         }
 433
 434         /**
 435          * This is the meaty bit -- restores archived revisions of the given page
 436          * to the cur/old tables. If the page currently exists, all revisions will
 437          * be stuffed into old, otherwise the most recent will go into cur.
 438          *
 439          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 440          * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
 441          * @param string $comment
 442          * @throws ReadOnlyError
 443          * @return Status Object containing the number of revisions restored on success
 444          */
 445         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 446                 global $wgContentHandlerUseDB;
 447
 448                 if ( wfReadOnly() ) {
 449                         throw new ReadOnlyError();
 450                 }
 451
 452                 $restoreAll = empty( $timestamps );
 453                 $dbw = wfGetDB( DB_MASTER );
 454
 455                 # Does this page already exist? We'll have to update it...
 456                 $article = WikiPage::factory( $this->title );
 457                 # Load latest data for the current page (bug 31179)
 458                 $article->loadPageData( 'fromdbmaster' );
 459                 $oldcountable = $article->isCountable();
 460
 461                 $page = $dbw->selectRow( 'page',
 462                         array( 'page_id', 'page_latest' ),
 463                         array( 'page_namespace' => $this->title->getNamespace(),
 464                                 'page_title' => $this->title->getDBkey() ),
 465                         __METHOD__,
 466                         array( 'FOR UPDATE' ) // lock page
 467                 );
 468
 469                 if ( $page ) {
 470                         $makepage = false;
 471                         # Page already exists. Import the history, and if necessary
 472                         # we'll update the latest revision field in the record.
 473
 474                         $previousRevId = $page->page_latest;
 475
 476                         # Get the time span of this page
 477                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 478                                 array( 'rev_id' => $previousRevId ),
 479                                 __METHOD__ );
 480
 481                         if ( $previousTimestamp === false ) {
 482                                 wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
 483
 484                                 $status = Status::newGood( 0 );
 485                                 $status->warning( 'undeleterevision-missing' );
 486
 487                                 return $status;
 488                         }
 489                 } else {
 490                         # Have to create a new article...
 491                         $makepage = true;
 492                         $previousRevId = 0;
 493                         $previousTimestamp = 0;
 494                 }
 495
 496                 if ( $restoreAll ) {
 497                         $oldones = '1 = 1'; # All revisions...
 498                 } else {
 499                         $oldts = implode( ',',
 500                                 array_map( array( &$dbw, 'addQuotes' ),
 501                                         array_map( array( &$dbw, 'timestamp' ),
 502                                                 $timestamps ) ) );
 503
 504                         $oldones = "ar_timestamp IN ( {$oldts} )";
 505                 }
 506
 507                 $fields = array(
 508                         'ar_rev_id',
 509                         'ar_text',
 510                         'ar_comment',
 511                         'ar_user',
 512                         'ar_user_text',
 513                         'ar_timestamp',
 514                         'ar_minor_edit',
 515                         'ar_flags',
 516                         'ar_text_id',
 517                         'ar_deleted',
 518                         'ar_page_id',
 519                         'ar_len',
 520                         'ar_sha1'
 521                 );
 522
 523                 if ( $wgContentHandlerUseDB ) {
 524                         $fields[] = 'ar_content_format';
 525                         $fields[] = 'ar_content_model';
 526                 }
 527
 528                 /**
 529                  * Select each archived revision...
 530                  */
 531                 $result = $dbw->select( 'archive',
 532                         $fields,
 533                         /* WHERE */ array(
 534                                 'ar_namespace' => $this->title->getNamespace(),
 535                                 'ar_title' => $this->title->getDBkey(),
 536                                 $oldones ),
 537                         __METHOD__,
 538                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 539                 );
 540                 $ret = $dbw->resultObject( $result );
 541                 $rev_count = $dbw->numRows( $result );
 542
 543                 if ( !$rev_count ) {
 544                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 545
 546                         $status = Status::newGood( 0 );
 547                         $status->warning( "undelete-no-results" );
 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( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 639                 }
 640
 641                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 642
 643                 if ( $this->title->getNamespace() == NS_FILE ) {
 644                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 645                         $update->doUpdate();
 646                 }
 647
 648                 return Status::newGood( $restored );
 649         }
 650
 651         /**
 652          * @return Status
 653          */
 654         function getFileStatus() {
 655                 return $this->fileStatus;
 656         }
 657
 658         /**
 659          * @return Status
 660          */
 661         function getRevisionStatus() {
 662                 return $this->revisionStatus;
 663         }
 664 }
 665
 666 /**
 667  * Special page allowing users with the appropriate permissions to view
 668  * and restore deleted content.
 669  *
 670  * @ingroup SpecialPage
 671  */
 672 class SpecialUndelete extends SpecialPage {
 673         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 674         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 675
 676         /**
 677          * @var Title
 678          */
 679         var $mTargetObj;
 680
 681         function __construct() {
 682                 parent::__construct( 'Undelete', 'deletedhistory' );
 683         }
 684
 685         function loadRequest( $par ) {
 686                 $request = $this->getRequest();
 687                 $user = $this->getUser();
 688
 689                 $this->mAction = $request->getVal( 'action' );
 690                 if ( $par !== null && $par !== '' ) {
 691                         $this->mTarget = $par;
 692                 } else {
 693                         $this->mTarget = $request->getVal( 'target' );
 694                 }
 695
 696                 $this->mTargetObj = null;
 697
 698                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 699                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 700                 }
 701
 702                 $this->mSearchPrefix = $request->getText( 'prefix' );
 703                 $time = $request->getVal( 'timestamp' );
 704                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 705                 $this->mFilename = $request->getVal( 'file' );
 706
 707                 $posted = $request->wasPosted() &&
 708                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 709                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 710                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 711                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 712                 $this->mDiff = $request->getCheck( 'diff' );
 713                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 714                 $this->mComment = $request->getText( 'wpComment' );
 715                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 716                 $this->mToken = $request->getVal( 'token' );
 717
 718                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 719                         $this->mAllowed = true; // user can restore
 720                         $this->mCanView = true; // user can view content
 721                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 722                         $this->mAllowed = false; // user cannot restore
 723                         $this->mCanView = true; // user can view content
 724                         $this->mRestore = false;
 725                 } else { // user can only view the list of revisions
 726                         $this->mAllowed = false;
 727                         $this->mCanView = false;
 728                         $this->mTimestamp = '';
 729                         $this->mRestore = false;
 730                 }
 731
 732                 if ( $this->mRestore || $this->mInvert ) {
 733                         $timestamps = array();
 734                         $this->mFileVersions = array();
 735                         foreach ( $request->getValues() as $key => $val ) {
 736                                 $matches = array();
 737                                 if ( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 738                                         array_push( $timestamps, $matches[1] );
 739                                 }
 740
 741                                 if ( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 742                                         $this->mFileVersions[] = intval( $matches[1] );
 743                                 }
 744                         }
 745                         rsort( $timestamps );
 746                         $this->mTargetTimestamp = $timestamps;
 747                 }
 748         }
 749
 750         function execute( $par ) {
 751                 $this->checkPermissions();
 752                 $user = $this->getUser();
 753
 754                 $this->setHeaders();
 755                 $this->outputHeader();
 756
 757                 $this->loadRequest( $par );
 758
 759                 $out = $this->getOutput();
 760
 761                 if ( is_null( $this->mTargetObj ) ) {
 762                         $out->addWikiMsg( 'undelete-header' );
 763
 764                         # Not all users can just browse every deleted page from the list
 765                         if ( $user->isAllowed( 'browsearchive' ) ) {
 766                                 $this->showSearchForm();
 767                         }
 768                         return;
 769                 }
 770
 771                 if ( $this->mAllowed ) {
 772                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 773                 } else {
 774                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 775                 }
 776
 777                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 778
 779                 if ( $this->mTimestamp !== '' ) {
 780                         $this->showRevision( $this->mTimestamp );
 781                 } elseif ( $this->mFilename !== null && $this->mTargetObj->inNamespace( NS_FILE ) ) {
 782                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 783                         // Check if user is allowed to see this file
 784                         if ( !$file->exists() ) {
 785                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 786                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 787                                 if ( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 788                                         throw new PermissionsError( 'suppressrevision' );
 789                                 } else {
 790                                         throw new PermissionsError( 'deletedtext' );
 791                                 }
 792                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 793                                 $this->showFileConfirmationForm( $this->mFilename );
 794                         } else {
 795                                 $this->showFile( $this->mFilename );
 796                         }
 797                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 798                         $this->undelete();
 799                 } else {
 800                         $this->showHistory();
 801                 }
 802         }
 803
 804         function showSearchForm() {
 805                 global $wgScript;
 806
 807                 $out = $this->getOutput();
 808                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 809                 $out->addHTML(
 810                         Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) ) .
 811                                 Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 812                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 813                                 Html::rawElement(
 814                                         'label',
 815                                         array( 'for' => 'prefix' ),
 816                                         $this->msg( 'undelete-search-prefix' )->parse()
 817                                 ) .
 818                                 Xml::input(
 819                                         'prefix',
 820                                         20,
 821                                         $this->mSearchPrefix,
 822                                         array( 'id' => 'prefix', 'autofocus' => true )
 823                                 ) . ' ' .
 824                                 Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 825                                 Xml::closeElement( 'fieldset' ) .
 826                                 Xml::closeElement( 'form' )
 827                 );
 828
 829                 # List undeletable articles
 830                 if ( $this->mSearchPrefix ) {
 831                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 832                         $this->showList( $result );
 833                 }
 834         }
 835
 836         /**
 837          * Generic list of deleted pages
 838          *
 839          * @param ResultWrapper $result
 840          * @return bool
 841          */
 842         private function showList( $result ) {
 843                 $out = $this->getOutput();
 844
 845                 if ( $result->numRows() == 0 ) {
 846                         $out->addWikiMsg( 'undelete-no-results' );
 847                         return false;
 848                 }
 849
 850                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 851
 852                 $undelete = $this->getTitle();
 853                 $out->addHTML( "<ul>\n" );
 854                 foreach ( $result as $row ) {
 855                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 856                         if ( $title !== null ) {
 857                                 $item = Linker::linkKnown(
 858                                         $undelete,
 859                                         htmlspecialchars( $title->getPrefixedText() ),
 860                                         array(),
 861                                         array( 'target' => $title->getPrefixedText() )
 862                                 );
 863                         } else {
 864                                 // The title is no longer valid, show as text
 865                                 $item = Html::element(
 866                                         'span',
 867                                         array( 'class' => 'mw-invalidtitle' ),
 868                                         Linker::getInvalidTitleDescription(
 869                                                 $this->getContext(),
 870                                                 $row->ar_namespace,
 871                                                 $row->ar_title
 872                                         )
 873                                 );
 874                         }
 875                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 876                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 877                 }
 878                 $result->free();
 879                 $out->addHTML( "</ul>\n" );
 880
 881                 return true;
 882         }
 883
 884         private function showRevision( $timestamp ) {
 885                 if ( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 886                         return;
 887                 }
 888
 889                 $archive = new PageArchive( $this->mTargetObj );
 890                 if ( !wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) ) ) {
 891                         return;
 892                 }
 893                 $rev = $archive->getRevision( $timestamp );
 894
 895                 $out = $this->getOutput();
 896                 $user = $this->getUser();
 897
 898                 if ( !$rev ) {
 899                         $out->addWikiMsg( 'undeleterevision-missing' );
 900                         return;
 901                 }
 902
 903                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 904                         if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 905                                 $out->wrapWikiMsg(
 906                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 907                                         'rev-deleted-text-permission'
 908                                 );
 909                                 return;
 910                         }
 911
 912                         $out->wrapWikiMsg(
 913                                 "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 914                                 'rev-deleted-text-view'
 915                         );
 916                         $out->addHTML( '<br />' );
 917                         // and we are allowed to see...
 918                 }
 919
 920                 if ( $this->mDiff ) {
 921                         $previousRev = $archive->getPreviousRevision( $timestamp );
 922                         if ( $previousRev ) {
 923                                 $this->showDiff( $previousRev, $rev );
 924                                 if ( $this->mDiffOnly ) {
 925                                         return;
 926                                 }
 927
 928                                 $out->addHTML( '<hr />' );
 929                         } else {
 930                                 $out->addWikiMsg( 'undelete-nodiff' );
 931                         }
 932                 }
 933
 934                 $link = Linker::linkKnown(
 935                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 936                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 937                 );
 938
 939                 $lang = $this->getLanguage();
 940
 941                 // date and time are separate parameters to facilitate localisation.
 942                 // $time is kept for backward compat reasons.
 943                 $time = $lang->userTimeAndDate( $timestamp, $user );
 944                 $d = $lang->userDate( $timestamp, $user );
 945                 $t = $lang->userTime( $timestamp, $user );
 946                 $userLink = Linker::revUserTools( $rev );
 947
 948                 $content = $rev->getContent( Revision::FOR_THIS_USER, $user );
 949
 950                 $isText = ( $content instanceof TextContent );
 951
 952                 if ( $this->mPreview || $isText ) {
 953                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 954                 } else {
 955                         $openDiv = '<div id="mw-undelete-revision">';
 956                 }
 957                 $out->addHTML( $openDiv );
 958
 959                 // Revision delete links
 960                 if ( !$this->mDiff ) {
 961                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 962                         if ( $revdel ) {
 963                                 $out->addHTML( "$revdel " );
 964                         }
 965                 }
 966
 967                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 968                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 969
 970                 if ( !wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) ) ) {
 971                         return;
 972                 }
 973
 974                 if ( $this->mPreview || !$isText ) {
 975                         // NOTE: non-text content has no source view, so always use rendered preview
 976
 977                         // Hide [edit]s
 978                         $popts = $out->parserOptions();
 979                         $popts->setEditSection( false );
 980
 981                         $pout = $content->getParserOutput( $this->mTargetObj, $rev->getId(), $popts, true );
 982                         $out->addParserOutput( $pout );
 983                 }
 984
 985                 if ( $isText ) {
 986                         // source view for textual content
 987                         $sourceView = Xml::element(
 988                                 'textarea',
 989                                 array(
 990                                         'readonly' => 'readonly',
 991                                         'cols' => $user->getIntOption( 'cols' ),
 992                                         'rows' => $user->getIntOption( 'rows' )
 993                                 ),
 994                                 $content->getNativeData() . "\n"
 995                         );
 996
 997                         $previewButton = Xml::element( 'input', array(
 998                                 'type' => 'submit',
 999                                 'name' => 'preview',
1000                                 'value' => $this->msg( 'showpreview' )->text()
1001                         ) );
1002                 } else {
1003                         $sourceView = '';
1004                         $previewButton = '';
1005                 }
1006
1007                 $diffButton = Xml::element( 'input', array(
1008                         'name' => 'diff',
1009                         'type' => 'submit',
1010                         'value' => $this->msg( 'showdiff' )->text() ) );
1011
1012                 $out->addHTML(
1013                         $sourceView .
1014                                 Xml::openElement( 'div', array(
1015                                         'style' => 'clear: both' ) ) .
1016                                 Xml::openElement( 'form', array(
1017                                         'method' => 'post',
1018                                         'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
1019                                 Xml::element( 'input', array(
1020                                         'type' => 'hidden',
1021                                         'name' => 'target',
1022                                         'value' => $this->mTargetObj->getPrefixedDBkey() ) ) .
1023                                 Xml::element( 'input', array(
1024                                         'type' => 'hidden',
1025                                         'name' => 'timestamp',
1026                                         'value' => $timestamp ) ) .
1027                                 Xml::element( 'input', array(
1028                                         'type' => 'hidden',
1029                                         'name' => 'wpEditToken',
1030                                         'value' => $user->getEditToken() ) ) .
1031                                 $previewButton .
1032                                 $diffButton .
1033                                 Xml::closeElement( 'form' ) .
1034                                 Xml::closeElement( 'div' )
1035                 );
1036         }
1037
1038         /**
1039          * Build a diff display between this and the previous either deleted
1040          * or non-deleted edit.
1041          *
1042          * @param Revision $previousRev
1043          * @param Revision $currentRev
1044          * @return string HTML
1045          */
1046         function showDiff( $previousRev, $currentRev ) {
1047                 $diffContext = clone $this->getContext();
1048                 $diffContext->setTitle( $currentRev->getTitle() );
1049                 $diffContext->setWikiPage( WikiPage::factory( $currentRev->getTitle() ) );
1050
1051                 $diffEngine = $currentRev->getContentHandler()->createDifferenceEngine( $diffContext );
1052                 $diffEngine->showDiffStyle();
1053                 $this->getOutput()->addHTML( "<div>" .
1054                         "<table style='width: 98%;' cellpadding='0' cellspacing='4' class='diff'>" .
1055                         "<col class='diff-marker' />" .
1056                         "<col class='diff-content' />" .
1057                         "<col class='diff-marker' />" .
1058                         "<col class='diff-content' />" .
1059                         "<tr>" .
1060                         "<td colspan='2' style='width: 50%; text-align: center' class='diff-otitle'>" .
1061                         $this->diffHeader( $previousRev, 'o' ) .
1062                         "</td>\n" .
1063                         "<td colspan='2' style='width: 50%;  text-align: center' class='diff-ntitle'>" .
1064                         $this->diffHeader( $currentRev, 'n' ) .
1065                         "</td>\n" .
1066                         "</tr>" .
1067                         $diffEngine->generateContentDiffBody(
1068                                 $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
1069                                 $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ) ) .
1070                         "</table>" .
1071                         "</div>\n"
1072                 );
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->getTitle();
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                 return '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1115                         Linker::link(
1116                                 $targetPage,
1117                                 $this->msg(
1118                                         'revisionasof',
1119                                         $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
1120                                         $lang->userDate( $rev->getTimestamp(), $user ),
1121                                         $lang->userTime( $rev->getTimestamp(), $user )
1122                                 )->escaped(),
1123                                 array(),
1124                                 $targetQuery
1125                         ) .
1126                         '</strong></div>' .
1127                         '<div id="mw-diff-' . $prefix . 'title2">' .
1128                         Linker::revUserTools( $rev ) . '<br />' .
1129                         '</div>' .
1130                         '<div id="mw-diff-' . $prefix . 'title3">' .
1131                         $minor . Linker::revComment( $rev ) . $rdel . '<br />' .
1132                         '</div>' .
1133                         '<div id="mw-diff-' . $prefix . 'title5">' .
1134                         $tagSummary[0] . '<br />' .
1135                         '</div>';
1136         }
1137
1138         /**
1139          * Show a form confirming whether a tokenless user really wants to see a file
1140          */
1141         private function showFileConfirmationForm( $key ) {
1142                 $out = $this->getOutput();
1143                 $lang = $this->getLanguage();
1144                 $user = $this->getUser();
1145                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1146                 $out->addWikiMsg( 'undelete-show-file-confirm',
1147                         $this->mTargetObj->getText(),
1148                         $lang->userDate( $file->getTimestamp(), $user ),
1149                         $lang->userTime( $file->getTimestamp(), $user ) );
1150                 $out->addHTML(
1151                         Xml::openElement( 'form', array(
1152                                         'method' => 'POST',
1153                                         'action' => $this->getTitle()->getLocalURL( array(
1154                                                 'target' => $this->mTarget,
1155                                                 'file' => $key,
1156                                                 'token' => $user->getEditToken( $key ),
1157                                         ) ),
1158                                 )
1159                         ) .
1160                                 Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1161                                 '</form>'
1162                 );
1163         }
1164
1165         /**
1166          * Show a deleted file version requested by the visitor.
1167          */
1168         private function showFile( $key ) {
1169                 $this->getOutput()->disable();
1170
1171                 # We mustn't allow the output to be Squid cached, otherwise
1172                 # if an admin previews a deleted image, and it's cached, then
1173                 # a user without appropriate permissions can toddle off and
1174                 # nab the image, and Squid will serve it
1175                 $response = $this->getRequest()->response();
1176                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1177                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1178                 $response->header( 'Pragma: no-cache' );
1179
1180                 $repo = RepoGroup::singleton()->getLocalRepo();
1181                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1182                 $repo->streamFile( $path );
1183         }
1184
1185         private function showHistory() {
1186                 $out = $this->getOutput();
1187                 if ( $this->mAllowed ) {
1188                         $out->addModules( 'mediawiki.special.undelete' );
1189                 }
1190                 $out->wrapWikiMsg(
1191                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1192                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1193                 );
1194
1195                 $archive = new PageArchive( $this->mTargetObj );
1196                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1197                 /*
1198                 $text = $archive->getLastRevisionText();
1199                 if( is_null( $text ) ) {
1200                         $out->addWikiMsg( 'nohistory' );
1201                         return;
1202                 }
1203                 */
1204                 $out->addHTML( '<div class="mw-undelete-history">' );
1205                 if ( $this->mAllowed ) {
1206                         $out->addWikiMsg( 'undeletehistory' );
1207                         $out->addWikiMsg( 'undeleterevdel' );
1208                 } else {
1209                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1210                 }
1211                 $out->addHTML( '</div>' );
1212
1213                 # List all stored revisions
1214                 $revisions = $archive->listRevisions();
1215                 $files = $archive->listFiles();
1216
1217                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1218                 $haveFiles = $files && $files->numRows() > 0;
1219
1220                 # Batch existence check on user and talk pages
1221                 if ( $haveRevisions ) {
1222                         $batch = new LinkBatch();
1223                         foreach ( $revisions as $row ) {
1224                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1225                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1226                         }
1227                         $batch->execute();
1228                         $revisions->seek( 0 );
1229                 }
1230                 if ( $haveFiles ) {
1231                         $batch = new LinkBatch();
1232                         foreach ( $files as $row ) {
1233                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1234                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1235                         }
1236                         $batch->execute();
1237                         $files->seek( 0 );
1238                 }
1239
1240                 if ( $this->mAllowed ) {
1241                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1242                         # Start the form here
1243                         $top = Xml::openElement(
1244                                 'form',
1245                                 array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' )
1246                         );
1247                         $out->addHTML( $top );
1248                 }
1249
1250                 # Show relevant lines from the deletion log:
1251                 $deleteLogPage = new LogPage( 'delete' );
1252                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1253                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1254                 # Show relevant lines from the suppression log:
1255                 $suppressLogPage = new LogPage( 'suppress' );
1256                 if ( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1257                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1258                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1259                 }
1260
1261                 if ( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1262                         # Format the user-visible controls (comment field, submission button)
1263                         # in a nice little table
1264                         if ( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1265                                 $unsuppressBox =
1266                                         "<tr>
1267                                                 <td>&#160;</td>
1268                                                 <td class='mw-input'>" .
1269                                                 Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1270                                                         'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ) .
1271                                                 "</td>
1272                                         </tr>";
1273                         } else {
1274                                 $unsuppressBox = '';
1275                         }
1276
1277                         $table =
1278                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1279                                         Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1280                                         "<tr>
1281                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1282                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1283                                         "</td>
1284                                 </tr>
1285                                 <tr>
1286                                         <td class='mw-label'>" .
1287                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1288                                         "</td>
1289                                         <td class='mw-input'>" .
1290                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment', 'autofocus' => true ) ) .
1291                                         "</td>
1292                                 </tr>
1293                                 <tr>
1294                                         <td>&#160;</td>
1295                                         <td class='mw-submit'>" .
1296                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1297                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1298                                         "</td>
1299                                 </tr>" .
1300                                         $unsuppressBox .
1301                                         Xml::closeElement( 'table' ) .
1302                                         Xml::closeElement( 'fieldset' );
1303
1304                         $out->addHTML( $table );
1305                 }
1306
1307                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1308
1309                 if ( $haveRevisions ) {
1310                         # The page's stored (deleted) history:
1311                         $out->addHTML( '<ul>' );
1312                         $remaining = $revisions->numRows();
1313                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1314
1315                         foreach ( $revisions as $row ) {
1316                                 $remaining--;
1317                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1318                         }
1319                         $revisions->free();
1320                         $out->addHTML( '</ul>' );
1321                 } else {
1322                         $out->addWikiMsg( 'nohistory' );
1323                 }
1324
1325                 if ( $haveFiles ) {
1326                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1327                         $out->addHTML( '<ul>' );
1328                         foreach ( $files as $row ) {
1329                                 $out->addHTML( $this->formatFileRow( $row ) );
1330                         }
1331                         $files->free();
1332                         $out->addHTML( '</ul>' );
1333                 }
1334
1335                 if ( $this->mAllowed ) {
1336                         # Slip in the hidden controls here
1337                         $misc = Html::hidden( 'target', $this->mTarget );
1338                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1339                         $misc .= Xml::closeElement( 'form' );
1340                         $out->addHTML( $misc );
1341                 }
1342
1343                 return true;
1344         }
1345
1346         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1347                 $rev = Revision::newFromArchiveRow( $row,
1348                         array(
1349                                 'title' => $this->mTargetObj
1350                         ) );
1351
1352                 $revTextSize = '';
1353                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1354                 // Build checkboxen...
1355                 if ( $this->mAllowed ) {
1356                         if ( $this->mInvert ) {
1357                                 if ( in_array( $ts, $this->mTargetTimestamp ) ) {
1358                                         $checkBox = Xml::check( "ts$ts" );
1359                                 } else {
1360                                         $checkBox = Xml::check( "ts$ts", true );
1361                                 }
1362                         } else {
1363                                 $checkBox = Xml::check( "ts$ts" );
1364                         }
1365                 } else {
1366                         $checkBox = '';
1367                 }
1368
1369                 // Build page & diff links...
1370                 $user = $this->getUser();
1371                 if ( $this->mCanView ) {
1372                         $titleObj = $this->getTitle();
1373                         # Last link
1374                         if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1375                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1376                                 $last = $this->msg( 'diff' )->escaped();
1377                         } elseif ( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1378                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1379                                 $last = Linker::linkKnown(
1380                                         $titleObj,
1381                                         $this->msg( 'diff' )->escaped(),
1382                                         array(),
1383                                         array(
1384                                                 'target' => $this->mTargetObj->getPrefixedText(),
1385                                                 'timestamp' => $ts,
1386                                                 'diff' => 'prev'
1387                                         )
1388                                 );
1389                         } else {
1390                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1391                                 $last = $this->msg( 'diff' )->escaped();
1392                         }
1393                 } else {
1394                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1395                         $last = $this->msg( 'diff' )->escaped();
1396                 }
1397
1398                 // User links
1399                 $userLink = Linker::revUserTools( $rev );
1400
1401                 // Minor edit
1402                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1403
1404                 // Revision text size
1405                 $size = $row->ar_len;
1406                 if ( !is_null( $size ) ) {
1407                         $revTextSize = Linker::formatRevisionSize( $size );
1408                 }
1409
1410                 // Edit summary
1411                 $comment = Linker::revComment( $rev );
1412
1413                 // Tags
1414                 $attribs = array();
1415                 list( $tagSummary, $classes ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'deletedhistory' );
1416                 if ( $classes ) {
1417                         $attribs['class'] = implode( ' ', $classes );
1418                 }
1419
1420                 // Revision delete links
1421                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1422
1423                 $revisionRow = $this->msg( 'undelete-revision-row' )
1424                         ->rawParams( $checkBox, $revdlink, $last, $pageLink, $userLink, $minor, $revTextSize, $comment, $tagSummary )
1425                         ->escaped();
1426
1427                 return Xml::tags( 'li', $attribs, $revisionRow ) . "\n";
1428         }
1429
1430         private function formatFileRow( $row ) {
1431                 $file = ArchivedFile::newFromRow( $row );
1432                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1433                 $user = $this->getUser();
1434
1435                 if ( $this->mAllowed && $row->fa_storage_key ) {
1436                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1437                         $key = urlencode( $row->fa_storage_key );
1438                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1439                 } else {
1440                         $checkBox = '';
1441                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1442                 }
1443                 $userLink = $this->getFileUser( $file );
1444                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1445                 $bytes = $this->msg( 'parentheses' )
1446                         ->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )
1447                         ->plain();
1448                 $data = htmlspecialchars( $data . ' ' . $bytes );
1449                 $comment = $this->getFileComment( $file );
1450
1451                 // Add show/hide deletion links if available
1452                 $canHide = $user->isAllowed( 'deleterevision' );
1453                 if ( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1454                         if ( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1455                                 // Revision was hidden from sysops
1456                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide );
1457                         } else {
1458                                 $query = array(
1459                                         'type' => 'filearchive',
1460                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1461                                         'ids' => $row->fa_id
1462                                 );
1463                                 $revdlink = Linker::revDeleteLink( $query,
1464                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1465                         }
1466                 } else {
1467                         $revdlink = '';
1468                 }
1469
1470                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1471         }
1472
1473         /**
1474          * Fetch revision text link if it's available to all users
1475          *
1476          * @param Revision $rev
1477          * @param Title $titleObj
1478          * @param string $ts Timestamp
1479          * @return string
1480          */
1481         function getPageLink( $rev, $titleObj, $ts ) {
1482                 $user = $this->getUser();
1483                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1484
1485                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1486                         return '<span class="history-deleted">' . $time . '</span>';
1487                 }
1488
1489                 $link = Linker::linkKnown(
1490                         $titleObj,
1491                         htmlspecialchars( $time ),
1492                         array(),
1493                         array(
1494                                 'target' => $this->mTargetObj->getPrefixedText(),
1495                                 'timestamp' => $ts
1496                         )
1497                 );
1498
1499                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1500                         $link = '<span class="history-deleted">' . $link . '</span>';
1501                 }
1502
1503                 return $link;
1504         }
1505
1506         /**
1507          * Fetch image view link if it's available to all users
1508          *
1509          * @param File|ArchivedFile $file
1510          * @param Title $titleObj
1511          * @param string $ts A timestamp
1512          * @param string $key a storage key
1513          *
1514          * @return string HTML fragment
1515          */
1516         function getFileLink( $file, $titleObj, $ts, $key ) {
1517                 $user = $this->getUser();
1518                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1519
1520                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1521                         return '<span class="history-deleted">' . $time . '</span>';
1522                 }
1523
1524                 $link = Linker::linkKnown(
1525                         $titleObj,
1526                         htmlspecialchars( $time ),
1527                         array(),
1528                         array(
1529                                 'target' => $this->mTargetObj->getPrefixedText(),
1530                                 'file' => $key,
1531                                 'token' => $user->getEditToken( $key )
1532                         )
1533                 );
1534
1535                 if ( $file->isDeleted( File::DELETED_FILE ) ) {
1536                         $link = '<span class="history-deleted">' . $link . '</span>';
1537                 }
1538
1539                 return $link;
1540         }
1541
1542         /**
1543          * Fetch file's user id if it's available to this user
1544          *
1545          * @param File|ArchivedFile $file
1546          * @return string HTML fragment
1547          */
1548         function getFileUser( $file ) {
1549                 if ( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1550                         return '<span class="history-deleted">' .
1551                                 $this->msg( 'rev-deleted-user' )->escaped() .
1552                                 '</span>';
1553                 }
1554
1555                 $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1556                         Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1557
1558                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1559                         $link = '<span class="history-deleted">' . $link . '</span>';
1560                 }
1561
1562                 return $link;
1563         }
1564
1565         /**
1566          * Fetch file upload comment if it's available to this user
1567          *
1568          * @param File|ArchivedFile $file
1569          * @return string HTML fragment
1570          */
1571         function getFileComment( $file ) {
1572                 if ( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1573                         return '<span class="history-deleted"><span class="comment">' .
1574                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1575                 }
1576
1577                 $link = Linker::commentBlock( $file->getRawDescription() );
1578
1579                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1580                         $link = '<span class="history-deleted">' . $link . '</span>';
1581                 }
1582
1583                 return $link;
1584         }
1585
1586         function undelete() {
1587                 global $wgUploadMaintenance;
1588
1589                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1590                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1591                 }
1592
1593                 if ( wfReadOnly() ) {
1594                         throw new ReadOnlyError;
1595                 }
1596
1597                 $out = $this->getOutput();
1598                 $archive = new PageArchive( $this->mTargetObj );
1599                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1600                 $ok = $archive->undelete(
1601                         $this->mTargetTimestamp,
1602                         $this->mComment,
1603                         $this->mFileVersions,
1604                         $this->mUnsuppress,
1605                         $this->getUser()
1606                 );
1607
1608                 if ( is_array( $ok ) ) {
1609                         if ( $ok[1] ) { // Undeleted file count
1610                                 wfRunHooks( 'FileUndeleteComplete', array(
1611                                         $this->mTargetObj, $this->mFileVersions,
1612                                         $this->getUser(), $this->mComment ) );
1613                         }
1614
1615                         $link = Linker::linkKnown( $this->mTargetObj );
1616                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1617                 } else {
1618                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1619                 }
1620
1621                 // Show revision undeletion warnings and errors
1622                 $status = $archive->getRevisionStatus();
1623                 if ( $status && !$status->isGood() ) {
1624                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'cannotundelete', 'cannotundelete' ) . '</div>' );
1625                 }
1626
1627                 // Show file undeletion warnings and errors
1628                 $status = $archive->getFileStatus();
1629                 if ( $status && !$status->isGood() ) {
1630                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1631                 }
1632         }
1633
1634         protected function getGroupName() {
1635                 return 'pagetools';
1636         }
1637 }