includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30         /** @var Title */
  31         protected $title;
  32
  33         /** @var Status */
  34         protected $fileStatus;
  35
  36         /** @var Status */
  37         protected $revisionStatus;
  38
  39         /** @var Config */
  40         protected $config;
  41
  42         function __construct( $title, Config $config = null ) {
  43                 if ( is_null( $title ) ) {
  44                         throw new MWException( __METHOD__ . ' given a null title.' );
  45                 }
  46                 $this->title = $title;
  47                 if ( $config === null ) {
  48                         wfDebug( __METHOD__ . ' did not have a Config object passed to it' );
  49                         $config = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
  50                 }
  51                 $this->config = $config;
  52         }
  53
  54         /**
  55          * List all deleted pages recorded in the archive table. Returns result
  56          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  57          * namespace/title.
  58          *
  59          * @return ResultWrapper
  60          */
  61         public static function listAllPages() {
  62                 $dbr = wfGetDB( DB_SLAVE );
  63
  64                 return self::listPages( $dbr, '' );
  65         }
  66
  67         /**
  68          * List deleted pages recorded in the archive table matching the
  69          * given title prefix.
  70          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  71          *
  72          * @param string $prefix Title prefix
  73          * @return ResultWrapper
  74          */
  75         public static function listPagesByPrefix( $prefix ) {
  76                 $dbr = wfGetDB( DB_SLAVE );
  77
  78                 $title = Title::newFromText( $prefix );
  79                 if ( $title ) {
  80                         $ns = $title->getNamespace();
  81                         $prefix = $title->getDBkey();
  82                 } else {
  83                         // Prolly won't work too good
  84                         // @todo handle bare namespace names cleanly?
  85                         $ns = 0;
  86                 }
  87
  88                 $conds = array(
  89                         'ar_namespace' => $ns,
  90                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  91                 );
  92
  93                 return self::listPages( $dbr, $conds );
  94         }
  95
  96         /**
  97          * @param IDatabase $dbr
  98          * @param string|array $condition
  99          * @return bool|ResultWrapper
 100          */
 101         protected static function listPages( $dbr, $condition ) {
 102                 return $dbr->select(
 103                         array( 'archive' ),
 104                         array(
 105                                 'ar_namespace',
 106                                 'ar_title',
 107                                 'count' => 'COUNT(*)'
 108                         ),
 109                         $condition,
 110                         __METHOD__,
 111                         array(
 112                                 'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 113                                 'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 114                                 'LIMIT' => 100,
 115                         )
 116                 );
 117         }
 118
 119         /**
 120          * List the revisions of the given page. Returns result wrapper with
 121          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 122          *
 123          * @return ResultWrapper
 124          */
 125         function listRevisions() {
 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 ( $this->config->get( 'ContentHandlerUseDB' ) ) {
 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
 156                 return $dbr->select( $tables,
 157                         $fields,
 158                         $conds,
 159                         __METHOD__,
 160                         $options,
 161                         $join_conds
 162                 );
 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                 return $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
 188         /**
 189          * Return a Revision object containing data for the deleted revision.
 190          * Note that the result *may* or *may not* have a null page ID.
 191          *
 192          * @param string $timestamp
 193          * @return Revision|null
 194          */
 195         function getRevision( $timestamp ) {
 196                 $dbr = wfGetDB( DB_SLAVE );
 197
 198                 $fields = array(
 199                         'ar_rev_id',
 200                         'ar_text',
 201                         'ar_comment',
 202                         'ar_user',
 203                         'ar_user_text',
 204                         'ar_timestamp',
 205                         'ar_minor_edit',
 206                         'ar_flags',
 207                         'ar_text_id',
 208                         'ar_deleted',
 209                         'ar_len',
 210                         'ar_sha1',
 211                 );
 212
 213                 if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
 214                         $fields[] = 'ar_content_format';
 215                         $fields[] = 'ar_content_model';
 216                 }
 217
 218                 $row = $dbr->selectRow( 'archive',
 219                         $fields,
 220                         array( 'ar_namespace' => $this->title->getNamespace(),
 221                                 'ar_title' => $this->title->getDBkey(),
 222                                 'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 223                         __METHOD__ );
 224
 225                 if ( $row ) {
 226                         return Revision::newFromArchiveRow( $row, array( 'title' => $this->title ) );
 227                 }
 228
 229                 return null;
 230         }
 231
 232         /**
 233          * Return the most-previous revision, either live or deleted, against
 234          * the deleted revision given by timestamp.
 235          *
 236          * May produce unexpected results in case of history merges or other
 237          * unusual time issues.
 238          *
 239          * @param string $timestamp
 240          * @return Revision|null Null when there is no previous revision
 241          */
 242         function getPreviousRevision( $timestamp ) {
 243                 $dbr = wfGetDB( DB_SLAVE );
 244
 245                 // Check the previous deleted revision...
 246                 $row = $dbr->selectRow( 'archive',
 247                         'ar_timestamp',
 248                         array( 'ar_namespace' => $this->title->getNamespace(),
 249                                 'ar_title' => $this->title->getDBkey(),
 250                                 'ar_timestamp < ' .
 251                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 252                         __METHOD__,
 253                         array(
 254                                 'ORDER BY' => 'ar_timestamp DESC',
 255                                 'LIMIT' => 1 ) );
 256                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 257
 258                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 259                         array( 'rev_id', 'rev_timestamp' ),
 260                         array(
 261                                 'page_namespace' => $this->title->getNamespace(),
 262                                 'page_title' => $this->title->getDBkey(),
 263                                 'page_id = rev_page',
 264                                 'rev_timestamp < ' .
 265                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 266                         __METHOD__,
 267                         array(
 268                                 'ORDER BY' => 'rev_timestamp DESC',
 269                                 'LIMIT' => 1 ) );
 270                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 271                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 272
 273                 if ( $prevLive && $prevLive > $prevDeleted ) {
 274                         // Most prior revision was live
 275                         return Revision::newFromId( $prevLiveId );
 276                 } elseif ( $prevDeleted ) {
 277                         // Most prior revision was deleted
 278                         return $this->getRevision( $prevDeleted );
 279                 }
 280
 281                 // No prior revision on this page.
 282                 return null;
 283         }
 284
 285         /**
 286          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 287          *
 288          * @param object $row Database row
 289          * @return string
 290          */
 291         function getTextFromRow( $row ) {
 292                 if ( is_null( $row->ar_text_id ) ) {
 293                         // An old row from MediaWiki 1.4 or previous.
 294                         // Text is embedded in this row in classic compression format.
 295                         return Revision::getRevisionText( $row, 'ar_' );
 296                 }
 297
 298                 // New-style: keyed to the text storage backend.
 299                 $dbr = wfGetDB( DB_SLAVE );
 300                 $text = $dbr->selectRow( 'text',
 301                         array( 'old_text', 'old_flags' ),
 302                         array( 'old_id' => $row->ar_text_id ),
 303                         __METHOD__ );
 304
 305                 return Revision::getRevisionText( $text );
 306         }
 307
 308         /**
 309          * Fetch (and decompress if necessary) the stored text of the most
 310          * recently edited deleted revision of the page.
 311          *
 312          * If there are no archived revisions for the page, returns NULL.
 313          *
 314          * @return string|null
 315          */
 316         function getLastRevisionText() {
 317                 $dbr = wfGetDB( DB_SLAVE );
 318                 $row = $dbr->selectRow( 'archive',
 319                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 320                         array( 'ar_namespace' => $this->title->getNamespace(),
 321                                 'ar_title' => $this->title->getDBkey() ),
 322                         __METHOD__,
 323                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 324
 325                 if ( $row ) {
 326                         return $this->getTextFromRow( $row );
 327                 }
 328
 329                 return null;
 330         }
 331
 332         /**
 333          * Quick check if any archived revisions are present for the page.
 334          *
 335          * @return bool
 336          */
 337         function isDeleted() {
 338                 $dbr = wfGetDB( DB_SLAVE );
 339                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 340                         array( 'ar_namespace' => $this->title->getNamespace(),
 341                                 'ar_title' => $this->title->getDBkey() ),
 342                         __METHOD__
 343                 );
 344
 345                 return ( $n > 0 );
 346         }
 347
 348         /**
 349          * Restore the given (or all) text and file revisions for the page.
 350          * Once restored, the items will be removed from the archive tables.
 351          * The deletion log will be updated with an undeletion notice.
 352          *
 353          * @param array $timestamps Pass an empty array to restore all revisions,
 354          *   otherwise list the ones to undelete.
 355          * @param string $comment
 356          * @param array $fileVersions
 357          * @param bool $unsuppress
 358          * @param User $user User performing the action, or null to use $wgUser
 359          * @return array(number of file revisions restored, number of image revisions
 360          *   restored, log message) on success, false on failure.
 361          */
 362         function undelete( $timestamps, $comment = '', $fileVersions = array(),
 363                 $unsuppress = false, User $user = null
 364         ) {
 365                 // If both the set of text revisions and file revisions are empty,
 366                 // restore everything. Otherwise, just restore the requested items.
 367                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 368
 369                 $restoreText = $restoreAll || !empty( $timestamps );
 370                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 371
 372                 if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 373                         $img = wfLocalFile( $this->title );
 374                         $img->load( File::READ_LATEST );
 375                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 376                         if ( !$this->fileStatus->isOK() ) {
 377                                 return false;
 378                         }
 379                         $filesRestored = $this->fileStatus->successCount;
 380                 } else {
 381                         $filesRestored = 0;
 382                 }
 383
 384                 if ( $restoreText ) {
 385                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 386                         if ( !$this->revisionStatus->isOK() ) {
 387                                 return false;
 388                         }
 389
 390                         $textRestored = $this->revisionStatus->getValue();
 391                 } else {
 392                         $textRestored = 0;
 393                 }
 394
 395                 // Touch the log!
 396
 397                 if ( $textRestored && $filesRestored ) {
 398                         $reason = wfMessage( 'undeletedrevisions-files' )
 399                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 400                 } elseif ( $textRestored ) {
 401                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 402                                 ->inContentLanguage()->text();
 403                 } elseif ( $filesRestored ) {
 404                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 405                                 ->inContentLanguage()->text();
 406                 } else {
 407                         wfDebug( "Undelete: nothing undeleted...\n" );
 408
 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                 Hooks::run( '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,
 440          *   otherwise list the ones to undelete.
 441          * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
 442          * @param string $comment
 443          * @throws ReadOnlyError
 444          * @return Status Status object containing the number of revisions restored on success
 445          */
 446         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 447                 if ( wfReadOnly() ) {
 448                         throw new ReadOnlyError();
 449                 }
 450
 451                 $restoreAll = empty( $timestamps );
 452                 $dbw = wfGetDB( DB_MASTER );
 453
 454                 # Does this page already exist? We'll have to update it...
 455                 $article = WikiPage::factory( $this->title );
 456                 # Load latest data for the current page (bug 31179)
 457                 $article->loadPageData( 'fromdbmaster' );
 458                 $oldcountable = $article->isCountable();
 459
 460                 $page = $dbw->selectRow( 'page',
 461                         array( 'page_id', 'page_latest' ),
 462                         array( 'page_namespace' => $this->title->getNamespace(),
 463                                 'page_title' => $this->title->getDBkey() ),
 464                         __METHOD__,
 465                         array( 'FOR UPDATE' ) // lock page
 466                 );
 467
 468                 if ( $page ) {
 469                         $makepage = false;
 470                         # Page already exists. Import the history, and if necessary
 471                         # we'll update the latest revision field in the record.
 472
 473                         $previousRevId = $page->page_latest;
 474
 475                         # Get the time span of this page
 476                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 477                                 array( 'rev_id' => $previousRevId ),
 478                                 __METHOD__ );
 479
 480                         if ( $previousTimestamp === false ) {
 481                                 wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
 482
 483                                 $status = Status::newGood( 0 );
 484                                 $status->warning( 'undeleterevision-missing' );
 485
 486                                 return $status;
 487                         }
 488                 } else {
 489                         # Have to create a new article...
 490                         $makepage = true;
 491                         $previousRevId = 0;
 492                         $previousTimestamp = 0;
 493                 }
 494
 495                 $oldWhere = array(
 496                         'ar_namespace' => $this->title->getNamespace(),
 497                         'ar_title' => $this->title->getDBkey(),
 498                 );
 499                 if ( !$restoreAll ) {
 500                         $oldWhere['ar_timestamp'] = array_map( array( &$dbw, 'timestamp' ), $timestamps );
 501                 }
 502
 503                 $fields = array(
 504                         'ar_rev_id',
 505                         'ar_text',
 506                         'ar_comment',
 507                         'ar_user',
 508                         'ar_user_text',
 509                         'ar_timestamp',
 510                         'ar_minor_edit',
 511                         'ar_flags',
 512                         'ar_text_id',
 513                         'ar_deleted',
 514                         'ar_page_id',
 515                         'ar_len',
 516                         'ar_sha1'
 517                 );
 518
 519                 if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
 520                         $fields[] = 'ar_content_format';
 521                         $fields[] = 'ar_content_model';
 522                 }
 523
 524                 /**
 525                  * Select each archived revision...
 526                  */
 527                 $result = $dbw->select( 'archive',
 528                         $fields,
 529                         $oldWhere,
 530                         __METHOD__,
 531                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 532                 );
 533
 534                 $rev_count = $result->numRows();
 535                 if ( !$rev_count ) {
 536                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 537
 538                         $status = Status::newGood( 0 );
 539                         $status->warning( "undelete-no-results" );
 540
 541                         return $status;
 542                 }
 543
 544                 $result->seek( $rev_count - 1 ); // move to last
 545                 $row = $result->fetchObject(); // get newest archived rev
 546                 $oldPageId = (int)$row->ar_page_id; // pass this to ArticleUndelete hook
 547                 $result->seek( 0 ); // move back
 548
 549                 // grab the content to check consistency with global state before restoring the page.
 550                 $revision = Revision::newFromArchiveRow( $row,
 551                         array(
 552                                 'title' => $article->getTitle(), // used to derive default content model
 553                         )
 554                 );
 555                 $user = User::newFromName( $revision->getUserText( Revision::RAW ), false );
 556                 $content = $revision->getContent( Revision::RAW );
 557
 558                 //NOTE: article ID may not be known yet. prepareSave() should not modify the database.
 559                 $status = $content->prepareSave( $article, 0, -1, $user );
 560
 561                 if ( !$status->isOK() ) {
 562                         return $status;
 563                 }
 564
 565                 if ( $makepage ) {
 566                         // Check the state of the newest to-be version...
 567                         if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 568                                 return Status::newFatal( "undeleterevdel" );
 569                         }
 570                         // Safe to insert now...
 571                         $newid = $article->insertOn( $dbw );
 572                         $pageId = $newid;
 573                 } else {
 574                         // Check if a deleted revision will become the current revision...
 575                         if ( $row->ar_timestamp > $previousTimestamp ) {
 576                                 // Check the state of the newest to-be version...
 577                                 if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 578                                         return Status::newFatal( "undeleterevdel" );
 579                                 }
 580                         }
 581
 582                         $newid = false;
 583                         $pageId = $article->getId();
 584                 }
 585
 586                 $revision = null;
 587                 $restored = 0;
 588
 589                 foreach ( $result as $row ) {
 590                         // Check for key dupes due to shitty archive integrity.
 591                         if ( $row->ar_rev_id ) {
 592                                 $exists = $dbw->selectField( 'revision', '1',
 593                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 594                                 if ( $exists ) {
 595                                         continue; // don't throw DB errors
 596                                 }
 597                         }
 598                         // Insert one revision at a time...maintaining deletion status
 599                         // unless we are specifically removing all restrictions...
 600                         $revision = Revision::newFromArchiveRow( $row,
 601                                 array(
 602                                         'page' => $pageId,
 603                                         'title' => $this->title,
 604                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 605                                 ) );
 606
 607                         $revision->insertOn( $dbw );
 608                         $restored++;
 609
 610                         Hooks::run( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 611                 }
 612                 # Now that it's safely stored, take it out of the archive
 613                 $dbw->delete( 'archive',
 614                         $oldWhere,
 615                         __METHOD__ );
 616
 617                 // Was anything restored at all?
 618                 if ( $restored == 0 ) {
 619                         return Status::newGood( 0 );
 620                 }
 621
 622                 $created = (bool)$newid;
 623
 624                 // Attach the latest revision to the page...
 625                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 626                 if ( $created || $wasnew ) {
 627                         // Update site stats, link tables, etc
 628                         $user = User::newFromName( $revision->getUserText( Revision::RAW ), false );
 629                         $article->doEditUpdates(
 630                                 $revision,
 631                                 $user,
 632                                 array( 'created' => $created, 'oldcountable' => $oldcountable )
 633                         );
 634                 }
 635
 636                 Hooks::run( 'ArticleUndelete', array( &$this->title, $created, $comment, $oldPageId ) );
 637
 638                 if ( $this->title->getNamespace() == NS_FILE ) {
 639                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 640                         $update->doUpdate();
 641                 }
 642
 643                 return Status::newGood( $restored );
 644         }
 645
 646         /**
 647          * @return Status
 648          */
 649         function getFileStatus() {
 650                 return $this->fileStatus;
 651         }
 652
 653         /**
 654          * @return Status
 655          */
 656         function getRevisionStatus() {
 657                 return $this->revisionStatus;
 658         }
 659 }
 660
 661 /**
 662  * Special page allowing users with the appropriate permissions to view
 663  * and restore deleted content.
 664  *
 665  * @ingroup SpecialPage
 666  */
 667 class SpecialUndelete extends SpecialPage {
 668         private $mAction;
 669         private $mTarget;
 670         private $mTimestamp;
 671         private $mRestore;
 672         private $mInvert;
 673         private $mFilename;
 674         private $mTargetTimestamp;
 675         private $mAllowed;
 676         private $mCanView;
 677         private $mComment;
 678         private $mToken;
 679
 680         /** @var Title */
 681         private $mTargetObj;
 682
 683         function __construct() {
 684                 parent::__construct( 'Undelete', 'deletedhistory' );
 685         }
 686
 687         function loadRequest( $par ) {
 688                 $request = $this->getRequest();
 689                 $user = $this->getUser();
 690
 691                 $this->mAction = $request->getVal( 'action' );
 692                 if ( $par !== null && $par !== '' ) {
 693                         $this->mTarget = $par;
 694                 } else {
 695                         $this->mTarget = $request->getVal( 'target' );
 696                 }
 697
 698                 $this->mTargetObj = null;
 699
 700                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 701                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 702                 }
 703
 704                 $this->mSearchPrefix = $request->getText( 'prefix' );
 705                 $time = $request->getVal( 'timestamp' );
 706                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 707                 $this->mFilename = $request->getVal( 'file' );
 708
 709                 $posted = $request->wasPosted() &&
 710                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 711                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 712                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 713                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 714                 $this->mDiff = $request->getCheck( 'diff' );
 715                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 716                 $this->mComment = $request->getText( 'wpComment' );
 717                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 718                 $this->mToken = $request->getVal( 'token' );
 719
 720                 if ( $this->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 721                         $this->mAllowed = true; // user can restore
 722                         $this->mCanView = true; // user can view content
 723                 } elseif ( $this->isAllowed( 'deletedtext' ) ) {
 724                         $this->mAllowed = false; // user cannot restore
 725                         $this->mCanView = true; // user can view content
 726                         $this->mRestore = false;
 727                 } else { // user can only view the list of revisions
 728                         $this->mAllowed = false;
 729                         $this->mCanView = false;
 730                         $this->mTimestamp = '';
 731                         $this->mRestore = false;
 732                 }
 733
 734                 if ( $this->mRestore || $this->mInvert ) {
 735                         $timestamps = array();
 736                         $this->mFileVersions = array();
 737                         foreach ( $request->getValues() as $key => $val ) {
 738                                 $matches = array();
 739                                 if ( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 740                                         array_push( $timestamps, $matches[1] );
 741                                 }
 742
 743                                 if ( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 744                                         $this->mFileVersions[] = intval( $matches[1] );
 745                                 }
 746                         }
 747                         rsort( $timestamps );
 748                         $this->mTargetTimestamp = $timestamps;
 749                 }
 750         }
 751
 752         /**
 753          * Checks whether a user is allowed the permission for the
 754          * specific title if one is set.
 755          *
 756          * @param string $permission
 757          * @param User $user
 758          * @return bool
 759          */
 760         protected function isAllowed( $permission, User $user = null ) {
 761                 $user = $user ?: $this->getUser();
 762                 if ( $this->mTargetObj !== null ) {
 763                         return $this->mTargetObj->userCan( $permission, $user );
 764                 } else {
 765                         return $user->isAllowed( $permission );
 766                 }
 767         }
 768
 769         function userCanExecute( User $user ) {
 770                 return $this->isAllowed( $this->mRestriction, $user );
 771         }
 772
 773         function execute( $par ) {
 774                 $user = $this->getUser();
 775
 776                 $this->setHeaders();
 777                 $this->outputHeader();
 778
 779                 $this->loadRequest( $par );
 780                 $this->checkPermissions(); // Needs to be after mTargetObj is set
 781
 782                 $out = $this->getOutput();
 783
 784                 if ( is_null( $this->mTargetObj ) ) {
 785                         $out->addWikiMsg( 'undelete-header' );
 786
 787                         # Not all users can just browse every deleted page from the list
 788                         if ( $user->isAllowed( 'browsearchive' ) ) {
 789                                 $this->showSearchForm();
 790                         }
 791
 792                         return;
 793                 }
 794
 795                 $this->addHelpLink( 'Help:Undelete' );
 796                 if ( $this->mAllowed ) {
 797                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 798                 } else {
 799                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 800                 }
 801
 802                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 803
 804                 if ( $this->mTimestamp !== '' ) {
 805                         $this->showRevision( $this->mTimestamp );
 806                 } elseif ( $this->mFilename !== null && $this->mTargetObj->inNamespace( NS_FILE ) ) {
 807                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 808                         // Check if user is allowed to see this file
 809                         if ( !$file->exists() ) {
 810                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 811                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 812                                 if ( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 813                                         throw new PermissionsError( 'suppressrevision' );
 814                                 } else {
 815                                         throw new PermissionsError( 'deletedtext' );
 816                                 }
 817                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 818                                 $this->showFileConfirmationForm( $this->mFilename );
 819                         } else {
 820                                 $this->showFile( $this->mFilename );
 821                         }
 822                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 823                         $this->undelete();
 824                 } else {
 825                         $this->showHistory();
 826                 }
 827         }
 828
 829         function showSearchForm() {
 830                 $out = $this->getOutput();
 831                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 832                 $out->addHTML(
 833                         Xml::openElement( 'form', array( 'method' => 'get', 'action' => wfScript() ) ) .
 834                                 Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 835                                 Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
 836                                 Html::rawElement(
 837                                         'label',
 838                                         array( 'for' => 'prefix' ),
 839                                         $this->msg( 'undelete-search-prefix' )->parse()
 840                                 ) .
 841                                 Xml::input(
 842                                         'prefix',
 843                                         20,
 844                                         $this->mSearchPrefix,
 845                                         array( 'id' => 'prefix', 'autofocus' => '' )
 846                                 ) . ' ' .
 847                                 Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 848                                 Xml::closeElement( 'fieldset' ) .
 849                                 Xml::closeElement( 'form' )
 850                 );
 851
 852                 # List undeletable articles
 853                 if ( $this->mSearchPrefix ) {
 854                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 855                         $this->showList( $result );
 856                 }
 857         }
 858
 859         /**
 860          * Generic list of deleted pages
 861          *
 862          * @param ResultWrapper $result
 863          * @return bool
 864          */
 865         private function showList( $result ) {
 866                 $out = $this->getOutput();
 867
 868                 if ( $result->numRows() == 0 ) {
 869                         $out->addWikiMsg( 'undelete-no-results' );
 870
 871                         return false;
 872                 }
 873
 874                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 875
 876                 $undelete = $this->getPageTitle();
 877                 $out->addHTML( "<ul>\n" );
 878                 foreach ( $result as $row ) {
 879                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 880                         if ( $title !== null ) {
 881                                 $item = Linker::linkKnown(
 882                                         $undelete,
 883                                         htmlspecialchars( $title->getPrefixedText() ),
 884                                         array(),
 885                                         array( 'target' => $title->getPrefixedText() )
 886                                 );
 887                         } else {
 888                                 // The title is no longer valid, show as text
 889                                 $item = Html::element(
 890                                         'span',
 891                                         array( 'class' => 'mw-invalidtitle' ),
 892                                         Linker::getInvalidTitleDescription(
 893                                                 $this->getContext(),
 894                                                 $row->ar_namespace,
 895                                                 $row->ar_title
 896                                         )
 897                                 );
 898                         }
 899                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 900                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 901                 }
 902                 $result->free();
 903                 $out->addHTML( "</ul>\n" );
 904
 905                 return true;
 906         }
 907
 908         private function showRevision( $timestamp ) {
 909                 if ( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 910                         return;
 911                 }
 912
 913                 $archive = new PageArchive( $this->mTargetObj, $this->getConfig() );
 914                 if ( !Hooks::run( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) ) ) {
 915                         return;
 916                 }
 917                 $rev = $archive->getRevision( $timestamp );
 918
 919                 $out = $this->getOutput();
 920                 $user = $this->getUser();
 921
 922                 if ( !$rev ) {
 923                         $out->addWikiMsg( 'undeleterevision-missing' );
 924
 925                         return;
 926                 }
 927
 928                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 929                         if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 930                                 $out->wrapWikiMsg(
 931                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 932                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ) ?
 933                                         'rev-suppressed-text-permission' : 'rev-deleted-text-permission'
 934                                 );
 935
 936                                 return;
 937                         }
 938
 939                         $out->wrapWikiMsg(
 940                                 "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 941                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ) ?
 942                                         'rev-suppressed-text-view' : 'rev-deleted-text-view'
 943                         );
 944                         $out->addHTML( '<br />' );
 945                         // and we are allowed to see...
 946                 }
 947
 948                 if ( $this->mDiff ) {
 949                         $previousRev = $archive->getPreviousRevision( $timestamp );
 950                         if ( $previousRev ) {
 951                                 $this->showDiff( $previousRev, $rev );
 952                                 if ( $this->mDiffOnly ) {
 953                                         return;
 954                                 }
 955
 956                                 $out->addHTML( '<hr />' );
 957                         } else {
 958                                 $out->addWikiMsg( 'undelete-nodiff' );
 959                         }
 960                 }
 961
 962                 $link = Linker::linkKnown(
 963                         $this->getPageTitle( $this->mTargetObj->getPrefixedDBkey() ),
 964                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 965                 );
 966
 967                 $lang = $this->getLanguage();
 968
 969                 // date and time are separate parameters to facilitate localisation.
 970                 // $time is kept for backward compat reasons.
 971                 $time = $lang->userTimeAndDate( $timestamp, $user );
 972                 $d = $lang->userDate( $timestamp, $user );
 973                 $t = $lang->userTime( $timestamp, $user );
 974                 $userLink = Linker::revUserTools( $rev );
 975
 976                 $content = $rev->getContent( Revision::FOR_THIS_USER, $user );
 977
 978                 $isText = ( $content instanceof TextContent );
 979
 980                 if ( $this->mPreview || $isText ) {
 981                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 982                 } else {
 983                         $openDiv = '<div id="mw-undelete-revision">';
 984                 }
 985                 $out->addHTML( $openDiv );
 986
 987                 // Revision delete links
 988                 if ( !$this->mDiff ) {
 989                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 990                         if ( $revdel ) {
 991                                 $out->addHTML( "$revdel " );
 992                         }
 993                 }
 994
 995                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 996                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 997
 998                 if ( !Hooks::run( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) ) ) {
 999                         return;
1000                 }
1001
1002                 if ( ( $this->mPreview || !$isText ) && $content ) {
1003                         // NOTE: non-text content has no source view, so always use rendered preview
1004
1005                         // Hide [edit]s
1006                         $popts = $out->parserOptions();
1007                         $popts->setEditSection( false );
1008
1009                         $pout = $content->getParserOutput( $this->mTargetObj, $rev->getId(), $popts, true );
1010                         $out->addParserOutput( $pout );
1011                 }
1012
1013                 if ( $isText ) {
1014                         // source view for textual content
1015                         $sourceView = Xml::element(
1016                                 'textarea',
1017                                 array(
1018                                         'readonly' => 'readonly',
1019                                         'cols' => $user->getIntOption( 'cols' ),
1020                                         'rows' => $user->getIntOption( 'rows' )
1021                                 ),
1022                                 $content->getNativeData() . "\n"
1023                         );
1024
1025                         $previewButton = Xml::element( 'input', array(
1026                                 'type' => 'submit',
1027                                 'name' => 'preview',
1028                                 'value' => $this->msg( 'showpreview' )->text()
1029                         ) );
1030                 } else {
1031                         $sourceView = '';
1032                         $previewButton = '';
1033                 }
1034
1035                 $diffButton = Xml::element( 'input', array(
1036                         'name' => 'diff',
1037                         'type' => 'submit',
1038                         'value' => $this->msg( 'showdiff' )->text() ) );
1039
1040                 $out->addHTML(
1041                         $sourceView .
1042                                 Xml::openElement( 'div', array(
1043                                         'style' => 'clear: both' ) ) .
1044                                 Xml::openElement( 'form', array(
1045                                         'method' => 'post',
1046                                         'action' => $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
1047                                 Xml::element( 'input', array(
1048                                         'type' => 'hidden',
1049                                         'name' => 'target',
1050                                         'value' => $this->mTargetObj->getPrefixedDBkey() ) ) .
1051                                 Xml::element( 'input', array(
1052                                         'type' => 'hidden',
1053                                         'name' => 'timestamp',
1054                                         'value' => $timestamp ) ) .
1055                                 Xml::element( 'input', array(
1056                                         'type' => 'hidden',
1057                                         'name' => 'wpEditToken',
1058                                         'value' => $user->getEditToken() ) ) .
1059                                 $previewButton .
1060                                 $diffButton .
1061                                 Xml::closeElement( 'form' ) .
1062                                 Xml::closeElement( 'div' )
1063                 );
1064         }
1065
1066         /**
1067          * Build a diff display between this and the previous either deleted
1068          * or non-deleted edit.
1069          *
1070          * @param Revision $previousRev
1071          * @param Revision $currentRev
1072          * @return string HTML
1073          */
1074         function showDiff( $previousRev, $currentRev ) {
1075                 $diffContext = clone $this->getContext();
1076                 $diffContext->setTitle( $currentRev->getTitle() );
1077                 $diffContext->setWikiPage( WikiPage::factory( $currentRev->getTitle() ) );
1078
1079                 $diffEngine = $currentRev->getContentHandler()->createDifferenceEngine( $diffContext );
1080                 $diffEngine->showDiffStyle();
1081
1082                 $formattedDiff = $diffEngine->generateContentDiffBody(
1083                         $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
1084                         $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() )
1085                 );
1086
1087                 $formattedDiff = $diffEngine->addHeader(
1088                         $formattedDiff,
1089                         $this->diffHeader( $previousRev, 'o' ),
1090                         $this->diffHeader( $currentRev, 'n' )
1091                 );
1092
1093                 $this->getOutput()->addHTML( "<div>$formattedDiff</div>\n" );
1094         }
1095
1096         /**
1097          * @param Revision $rev
1098          * @param string $prefix
1099          * @return string
1100          */
1101         private function diffHeader( $rev, $prefix ) {
1102                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
1103                 if ( $isDeleted ) {
1104                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
1105                         $targetPage = $this->getPageTitle();
1106                         $targetQuery = array(
1107                                 'target' => $this->mTargetObj->getPrefixedText(),
1108                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
1109                         );
1110                 } else {
1111                         /// @todo FIXME: getId() may return non-zero for deleted revs...
1112                         $targetPage = $rev->getTitle();
1113                         $targetQuery = array( 'oldid' => $rev->getId() );
1114                 }
1115
1116                 // Add show/hide deletion links if available
1117                 $user = $this->getUser();
1118                 $lang = $this->getLanguage();
1119                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1120
1121                 if ( $rdel ) {
1122                         $rdel = " $rdel";
1123                 }
1124
1125                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1126
1127                 $tags = wfGetDB( DB_SLAVE )->selectField(
1128                         'tag_summary',
1129                         'ts_tags',
1130                         array( 'ts_rev_id' => $rev->getId() ),
1131                         __METHOD__
1132                 );
1133                 $tagSummary = ChangeTags::formatSummaryRow( $tags, 'deleteddiff' );
1134
1135                 // FIXME This is reimplementing DifferenceEngine#getRevisionHeader
1136                 // and partially #showDiffPage, but worse
1137                 return '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1138                         Linker::link(
1139                                 $targetPage,
1140                                 $this->msg(
1141                                         'revisionasof',
1142                                         $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
1143                                         $lang->userDate( $rev->getTimestamp(), $user ),
1144                                         $lang->userTime( $rev->getTimestamp(), $user )
1145                                 )->escaped(),
1146                                 array(),
1147                                 $targetQuery
1148                         ) .
1149                         '</strong></div>' .
1150                         '<div id="mw-diff-' . $prefix . 'title2">' .
1151                         Linker::revUserTools( $rev ) . '<br />' .
1152                         '</div>' .
1153                         '<div id="mw-diff-' . $prefix . 'title3">' .
1154                         $minor . Linker::revComment( $rev ) . $rdel . '<br />' .
1155                         '</div>' .
1156                         '<div id="mw-diff-' . $prefix . 'title5">' .
1157                         $tagSummary[0] . '<br />' .
1158                         '</div>';
1159         }
1160
1161         /**
1162          * Show a form confirming whether a tokenless user really wants to see a file
1163          * @param string $key
1164          */
1165         private function showFileConfirmationForm( $key ) {
1166                 $out = $this->getOutput();
1167                 $lang = $this->getLanguage();
1168                 $user = $this->getUser();
1169                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1170                 $out->addWikiMsg( 'undelete-show-file-confirm',
1171                         $this->mTargetObj->getText(),
1172                         $lang->userDate( $file->getTimestamp(), $user ),
1173                         $lang->userTime( $file->getTimestamp(), $user ) );
1174                 $out->addHTML(
1175                         Xml::openElement( 'form', array(
1176                                         'method' => 'POST',
1177                                         'action' => $this->getPageTitle()->getLocalURL( array(
1178                                                 'target' => $this->mTarget,
1179                                                 'file' => $key,
1180                                                 'token' => $user->getEditToken( $key ),
1181                                         ) ),
1182                                 )
1183                         ) .
1184                                 Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1185                                 '</form>'
1186                 );
1187         }
1188
1189         /**
1190          * Show a deleted file version requested by the visitor.
1191          * @param string $key
1192          */
1193         private function showFile( $key ) {
1194                 $this->getOutput()->disable();
1195
1196                 # We mustn't allow the output to be Squid cached, otherwise
1197                 # if an admin previews a deleted image, and it's cached, then
1198                 # a user without appropriate permissions can toddle off and
1199                 # nab the image, and Squid will serve it
1200                 $response = $this->getRequest()->response();
1201                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1202                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1203                 $response->header( 'Pragma: no-cache' );
1204
1205                 $repo = RepoGroup::singleton()->getLocalRepo();
1206                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1207                 $repo->streamFile( $path );
1208         }
1209
1210         protected function showHistory() {
1211                 $out = $this->getOutput();
1212                 if ( $this->mAllowed ) {
1213                         $out->addModules( 'mediawiki.special.undelete' );
1214                 }
1215                 $out->wrapWikiMsg(
1216                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1217                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1218                 );
1219
1220                 $archive = new PageArchive( $this->mTargetObj, $this->getConfig() );
1221                 Hooks::run( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1222                 /*
1223                 $text = $archive->getLastRevisionText();
1224                 if( is_null( $text ) ) {
1225                         $out->addWikiMsg( 'nohistory' );
1226                         return;
1227                 }
1228                 */
1229                 $out->addHTML( '<div class="mw-undelete-history">' );
1230                 if ( $this->mAllowed ) {
1231                         $out->addWikiMsg( 'undeletehistory' );
1232                         $out->addWikiMsg( 'undeleterevdel' );
1233                 } else {
1234                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1235                 }
1236                 $out->addHTML( '</div>' );
1237
1238                 # List all stored revisions
1239                 $revisions = $archive->listRevisions();
1240                 $files = $archive->listFiles();
1241
1242                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1243                 $haveFiles = $files && $files->numRows() > 0;
1244
1245                 # Batch existence check on user and talk pages
1246                 if ( $haveRevisions ) {
1247                         $batch = new LinkBatch();
1248                         foreach ( $revisions as $row ) {
1249                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1250                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1251                         }
1252                         $batch->execute();
1253                         $revisions->seek( 0 );
1254                 }
1255                 if ( $haveFiles ) {
1256                         $batch = new LinkBatch();
1257                         foreach ( $files as $row ) {
1258                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1259                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1260                         }
1261                         $batch->execute();
1262                         $files->seek( 0 );
1263                 }
1264
1265                 if ( $this->mAllowed ) {
1266                         $action = $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) );
1267                         # Start the form here
1268                         $top = Xml::openElement(
1269                                 'form',
1270                                 array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' )
1271                         );
1272                         $out->addHTML( $top );
1273                 }
1274
1275                 # Show relevant lines from the deletion log:
1276                 $deleteLogPage = new LogPage( 'delete' );
1277                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1278                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1279                 # Show relevant lines from the suppression log:
1280                 $suppressLogPage = new LogPage( 'suppress' );
1281                 if ( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1282                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1283                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1284                 }
1285
1286                 if ( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1287                         # Format the user-visible controls (comment field, submission button)
1288                         # in a nice little table
1289                         if ( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1290                                 $unsuppressBox =
1291                                         "<tr>
1292                                                 <td>&#160;</td>
1293                                                 <td class='mw-input'>" .
1294                                                 Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1295                                                         'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ) .
1296                                                 "</td>
1297                                         </tr>";
1298                         } else {
1299                                 $unsuppressBox = '';
1300                         }
1301
1302                         $table = Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1303                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1304                                 "<tr>
1305                                         <td colspan='2' class='mw-undelete-extrahelp'>" .
1306                                 $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1307                                 "</td>
1308                         </tr>
1309                         <tr>
1310                                 <td class='mw-label'>" .
1311                                 Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1312                                 "</td>
1313                                 <td class='mw-input'>" .
1314                                 Xml::input(
1315                                         'wpComment',
1316                                         50,
1317                                         $this->mComment,
1318                                         array( 'id' => 'wpComment', 'autofocus' => '' )
1319                                 ) .
1320                                 "</td>
1321                         </tr>
1322                         <tr>
1323                                 <td>&#160;</td>
1324                                 <td class='mw-submit'>" .
1325                                 Xml::submitButton(
1326                                         $this->msg( 'undeletebtn' )->text(),
1327                                         array( 'name' => 'restore', 'id' => 'mw-undelete-submit' )
1328                                 ) . ' ' .
1329                                 Xml::submitButton(
1330                                         $this->msg( 'undeleteinvert' )->text(),
1331                                         array( 'name' => 'invert', 'id' => 'mw-undelete-invert' )
1332                                 ) .
1333                                 "</td>
1334                         </tr>" .
1335                                 $unsuppressBox .
1336                                 Xml::closeElement( 'table' ) .
1337                                 Xml::closeElement( 'fieldset' );
1338
1339                         $out->addHTML( $table );
1340                 }
1341
1342                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1343
1344                 if ( $haveRevisions ) {
1345                         # The page's stored (deleted) history:
1346                         $out->addHTML( '<ul>' );
1347                         $remaining = $revisions->numRows();
1348                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1349
1350                         foreach ( $revisions as $row ) {
1351                                 $remaining--;
1352                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1353                         }
1354                         $revisions->free();
1355                         $out->addHTML( '</ul>' );
1356                 } else {
1357                         $out->addWikiMsg( 'nohistory' );
1358                 }
1359
1360                 if ( $haveFiles ) {
1361                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1362                         $out->addHTML( '<ul>' );
1363                         foreach ( $files as $row ) {
1364                                 $out->addHTML( $this->formatFileRow( $row ) );
1365                         }
1366                         $files->free();
1367                         $out->addHTML( '</ul>' );
1368                 }
1369
1370                 if ( $this->mAllowed ) {
1371                         # Slip in the hidden controls here
1372                         $misc = Html::hidden( 'target', $this->mTarget );
1373                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1374                         $misc .= Xml::closeElement( 'form' );
1375                         $out->addHTML( $misc );
1376                 }
1377
1378                 return true;
1379         }
1380
1381         protected function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1382                 $rev = Revision::newFromArchiveRow( $row,
1383                         array(
1384                                 'title' => $this->mTargetObj
1385                         ) );
1386
1387                 $revTextSize = '';
1388                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1389                 // Build checkboxen...
1390                 if ( $this->mAllowed ) {
1391                         if ( $this->mInvert ) {
1392                                 if ( in_array( $ts, $this->mTargetTimestamp ) ) {
1393                                         $checkBox = Xml::check( "ts$ts" );
1394                                 } else {
1395                                         $checkBox = Xml::check( "ts$ts", true );
1396                                 }
1397                         } else {
1398                                 $checkBox = Xml::check( "ts$ts" );
1399                         }
1400                 } else {
1401                         $checkBox = '';
1402                 }
1403
1404                 // Build page & diff links...
1405                 $user = $this->getUser();
1406                 if ( $this->mCanView ) {
1407                         $titleObj = $this->getPageTitle();
1408                         # Last link
1409                         if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1410                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1411                                 $last = $this->msg( 'diff' )->escaped();
1412                         } elseif ( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1413                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1414                                 $last = Linker::linkKnown(
1415                                         $titleObj,
1416                                         $this->msg( 'diff' )->escaped(),
1417                                         array(),
1418                                         array(
1419                                                 'target' => $this->mTargetObj->getPrefixedText(),
1420                                                 'timestamp' => $ts,
1421                                                 'diff' => 'prev'
1422                                         )
1423                                 );
1424                         } else {
1425                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1426                                 $last = $this->msg( 'diff' )->escaped();
1427                         }
1428                 } else {
1429                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1430                         $last = $this->msg( 'diff' )->escaped();
1431                 }
1432
1433                 // User links
1434                 $userLink = Linker::revUserTools( $rev );
1435
1436                 // Minor edit
1437                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1438
1439                 // Revision text size
1440                 $size = $row->ar_len;
1441                 if ( !is_null( $size ) ) {
1442                         $revTextSize = Linker::formatRevisionSize( $size );
1443                 }
1444
1445                 // Edit summary
1446                 $comment = Linker::revComment( $rev );
1447
1448                 // Tags
1449                 $attribs = array();
1450                 list( $tagSummary, $classes ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'deletedhistory' );
1451                 if ( $classes ) {
1452                         $attribs['class'] = implode( ' ', $classes );
1453                 }
1454
1455                 // Revision delete links
1456                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1457
1458                 $revisionRow = $this->msg( 'undelete-revision-row' )
1459                         ->rawParams(
1460                                 $checkBox,
1461                                 $revdlink,
1462                                 $last,
1463                                 $pageLink,
1464                                 $userLink,
1465                                 $minor,
1466                                 $revTextSize,
1467                                 $comment,
1468                                 $tagSummary
1469                         )
1470                         ->escaped();
1471
1472                 return Xml::tags( 'li', $attribs, $revisionRow ) . "\n";
1473         }
1474
1475         private function formatFileRow( $row ) {
1476                 $file = ArchivedFile::newFromRow( $row );
1477                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1478                 $user = $this->getUser();
1479
1480                 $checkBox = '';
1481                 if ( $this->mCanView && $row->fa_storage_key ) {
1482                         if ( $this->mAllowed ) {
1483                                 $checkBox = Xml::check( 'fileid' . $row->fa_id );
1484                         }
1485                         $key = urlencode( $row->fa_storage_key );
1486                         $pageLink = $this->getFileLink( $file, $this->getPageTitle(), $ts, $key );
1487                 } else {
1488                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1489                 }
1490                 $userLink = $this->getFileUser( $file );
1491                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1492                 $bytes = $this->msg( 'parentheses' )
1493                         ->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )
1494                         ->plain();
1495                 $data = htmlspecialchars( $data . ' ' . $bytes );
1496                 $comment = $this->getFileComment( $file );
1497
1498                 // Add show/hide deletion links if available
1499                 $canHide = $this->isAllowed( 'deleterevision' );
1500                 if ( $canHide || ( $file->getVisibility() && $this->isAllowed( 'deletedhistory' ) ) ) {
1501                         if ( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1502                                 // Revision was hidden from sysops
1503                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide );
1504                         } else {
1505                                 $query = array(
1506                                         'type' => 'filearchive',
1507                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1508                                         'ids' => $row->fa_id
1509                                 );
1510                                 $revdlink = Linker::revDeleteLink( $query,
1511                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1512                         }
1513                 } else {
1514                         $revdlink = '';
1515                 }
1516
1517                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1518         }
1519
1520         /**
1521          * Fetch revision text link if it's available to all users
1522          *
1523          * @param Revision $rev
1524          * @param Title $titleObj
1525          * @param string $ts Timestamp
1526          * @return string
1527          */
1528         function getPageLink( $rev, $titleObj, $ts ) {
1529                 $user = $this->getUser();
1530                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1531
1532                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1533                         return '<span class="history-deleted">' . $time . '</span>';
1534                 }
1535
1536                 $link = Linker::linkKnown(
1537                         $titleObj,
1538                         htmlspecialchars( $time ),
1539                         array(),
1540                         array(
1541                                 'target' => $this->mTargetObj->getPrefixedText(),
1542                                 'timestamp' => $ts
1543                         )
1544                 );
1545
1546                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1547                         $link = '<span class="history-deleted">' . $link . '</span>';
1548                 }
1549
1550                 return $link;
1551         }
1552
1553         /**
1554          * Fetch image view link if it's available to all users
1555          *
1556          * @param File|ArchivedFile $file
1557          * @param Title $titleObj
1558          * @param string $ts A timestamp
1559          * @param string $key A storage key
1560          *
1561          * @return string HTML fragment
1562          */
1563         function getFileLink( $file, $titleObj, $ts, $key ) {
1564                 $user = $this->getUser();
1565                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1566
1567                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1568                         return '<span class="history-deleted">' . $time . '</span>';
1569                 }
1570
1571                 $link = Linker::linkKnown(
1572                         $titleObj,
1573                         htmlspecialchars( $time ),
1574                         array(),
1575                         array(
1576                                 'target' => $this->mTargetObj->getPrefixedText(),
1577                                 'file' => $key,
1578                                 'token' => $user->getEditToken( $key )
1579                         )
1580                 );
1581
1582                 if ( $file->isDeleted( File::DELETED_FILE ) ) {
1583                         $link = '<span class="history-deleted">' . $link . '</span>';
1584                 }
1585
1586                 return $link;
1587         }
1588
1589         /**
1590          * Fetch file's user id if it's available to this user
1591          *
1592          * @param File|ArchivedFile $file
1593          * @return string HTML fragment
1594          */
1595         function getFileUser( $file ) {
1596                 if ( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1597                         return '<span class="history-deleted">' .
1598                                 $this->msg( 'rev-deleted-user' )->escaped() .
1599                                 '</span>';
1600                 }
1601
1602                 $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1603                         Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1604
1605                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1606                         $link = '<span class="history-deleted">' . $link . '</span>';
1607                 }
1608
1609                 return $link;
1610         }
1611
1612         /**
1613          * Fetch file upload comment if it's available to this user
1614          *
1615          * @param File|ArchivedFile $file
1616          * @return string HTML fragment
1617          */
1618         function getFileComment( $file ) {
1619                 if ( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1620                         return '<span class="history-deleted"><span class="comment">' .
1621                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1622                 }
1623
1624                 $link = Linker::commentBlock( $file->getRawDescription() );
1625
1626                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1627                         $link = '<span class="history-deleted">' . $link . '</span>';
1628                 }
1629
1630                 return $link;
1631         }
1632
1633         function undelete() {
1634                 if ( $this->getConfig()->get( 'UploadMaintenance' )
1635                         && $this->mTargetObj->getNamespace() == NS_FILE
1636                 ) {
1637                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1638                 }
1639
1640                 if ( wfReadOnly() ) {
1641                         throw new ReadOnlyError;
1642                 }
1643
1644                 $out = $this->getOutput();
1645                 $archive = new PageArchive( $this->mTargetObj, $this->getConfig() );
1646                 Hooks::run( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1647                 $ok = $archive->undelete(
1648                         $this->mTargetTimestamp,
1649                         $this->mComment,
1650                         $this->mFileVersions,
1651                         $this->mUnsuppress,
1652                         $this->getUser()
1653                 );
1654
1655                 if ( is_array( $ok ) ) {
1656                         if ( $ok[1] ) { // Undeleted file count
1657                                 Hooks::run( 'FileUndeleteComplete', array(
1658                                         $this->mTargetObj, $this->mFileVersions,
1659                                         $this->getUser(), $this->mComment ) );
1660                         }
1661
1662                         $link = Linker::linkKnown( $this->mTargetObj );
1663                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1664                 } else {
1665                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1666                 }
1667
1668                 // Show revision undeletion warnings and errors
1669                 $status = $archive->getRevisionStatus();
1670                 if ( $status && !$status->isGood() ) {
1671                         $out->addWikiText( '<div class="error">' .
1672                                 $status->getWikiText(
1673                                         'cannotundelete',
1674                                         'cannotundelete'
1675                                 ) . '</div>'
1676                         );
1677                 }
1678
1679                 // Show file undeletion warnings and errors
1680                 $status = $archive->getFileStatus();
1681                 if ( $status && !$status->isGood() ) {
1682                         $out->addWikiText( '<div class="error">' .
1683                                 $status->getWikiText(
1684                                         'undelete-error-short',
1685                                         'undelete-error-long'
1686                                 ) . '</div>'
1687                         );
1688                 }
1689         }
1690
1691         protected function getGroupName() {
1692                 return 'pagetools';
1693         }
1694 }