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                 return $dbr->select( $tables,
 156                         $fields,
 157                         $conds,
 158                         __METHOD__,
 159                         $options,
 160                         $join_conds
 161                 );
 162         }
 163
 164         /**
 165          * List the deleted file revisions for this page, if it's a file page.
 166          * Returns a result wrapper with various filearchive fields, or null
 167          * if not a file page.
 168          *
 169          * @return ResultWrapper
 170          * @todo Does this belong in Image for fuller encapsulation?
 171          */
 172         function listFiles() {
 173                 if ( $this->title->getNamespace() != NS_FILE ) {
 174                         return null;
 175                 }
 176
 177                 $dbr = wfGetDB( DB_SLAVE );
 178                 return $dbr->select(
 179                         'filearchive',
 180                         ArchivedFile::selectFields(),
 181                         array( 'fa_name' => $this->title->getDBkey() ),
 182                         __METHOD__,
 183                         array( 'ORDER BY' => 'fa_timestamp DESC' )
 184                 );
 185         }
 186
 187         /**
 188          * Return a Revision object containing data for the deleted revision.
 189          * Note that the result *may* or *may not* have a null page ID.
 190          *
 191          * @param string $timestamp
 192          * @return Revision|null
 193          */
 194         function getRevision( $timestamp ) {
 195                 $dbr = wfGetDB( DB_SLAVE );
 196
 197                 $fields = array(
 198                         'ar_rev_id',
 199                         'ar_text',
 200                         'ar_comment',
 201                         'ar_user',
 202                         'ar_user_text',
 203                         'ar_timestamp',
 204                         'ar_minor_edit',
 205                         'ar_flags',
 206                         'ar_text_id',
 207                         'ar_deleted',
 208                         'ar_len',
 209                         'ar_sha1',
 210                 );
 211
 212                 if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
 213                         $fields[] = 'ar_content_format';
 214                         $fields[] = 'ar_content_model';
 215                 }
 216
 217                 $row = $dbr->selectRow( 'archive',
 218                         $fields,
 219                         array( 'ar_namespace' => $this->title->getNamespace(),
 220                                 'ar_title' => $this->title->getDBkey(),
 221                                 'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 222                         __METHOD__ );
 223
 224                 if ( $row ) {
 225                         return Revision::newFromArchiveRow( $row, array( 'title' => $this->title ) );
 226                 }
 227
 228                 return null;
 229         }
 230
 231         /**
 232          * Return the most-previous revision, either live or deleted, against
 233          * the deleted revision given by timestamp.
 234          *
 235          * May produce unexpected results in case of history merges or other
 236          * unusual time issues.
 237          *
 238          * @param string $timestamp
 239          * @return Revision|null Null when there is no previous revision
 240          */
 241         function getPreviousRevision( $timestamp ) {
 242                 $dbr = wfGetDB( DB_SLAVE );
 243
 244                 // Check the previous deleted revision...
 245                 $row = $dbr->selectRow( 'archive',
 246                         'ar_timestamp',
 247                         array( 'ar_namespace' => $this->title->getNamespace(),
 248                                 'ar_title' => $this->title->getDBkey(),
 249                                 'ar_timestamp < ' .
 250                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 251                         __METHOD__,
 252                         array(
 253                                 'ORDER BY' => 'ar_timestamp DESC',
 254                                 'LIMIT' => 1 ) );
 255                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 256
 257                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 258                         array( 'rev_id', 'rev_timestamp' ),
 259                         array(
 260                                 'page_namespace' => $this->title->getNamespace(),
 261                                 'page_title' => $this->title->getDBkey(),
 262                                 'page_id = rev_page',
 263                                 'rev_timestamp < ' .
 264                                         $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 265                         __METHOD__,
 266                         array(
 267                                 'ORDER BY' => 'rev_timestamp DESC',
 268                                 'LIMIT' => 1 ) );
 269                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 270                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 271
 272                 if ( $prevLive && $prevLive > $prevDeleted ) {
 273                         // Most prior revision was live
 274                         return Revision::newFromId( $prevLiveId );
 275                 } elseif ( $prevDeleted ) {
 276                         // Most prior revision was deleted
 277                         return $this->getRevision( $prevDeleted );
 278                 }
 279
 280                 // No prior revision on this page.
 281                 return null;
 282         }
 283
 284         /**
 285          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 286          *
 287          * @param object $row Database row
 288          * @return string
 289          */
 290         function getTextFromRow( $row ) {
 291                 if ( is_null( $row->ar_text_id ) ) {
 292                         // An old row from MediaWiki 1.4 or previous.
 293                         // Text is embedded in this row in classic compression format.
 294                         return Revision::getRevisionText( $row, 'ar_' );
 295                 }
 296
 297                 // New-style: keyed to the text storage backend.
 298                 $dbr = wfGetDB( DB_SLAVE );
 299                 $text = $dbr->selectRow( 'text',
 300                         array( 'old_text', 'old_flags' ),
 301                         array( 'old_id' => $row->ar_text_id ),
 302                         __METHOD__ );
 303
 304                 return Revision::getRevisionText( $text );
 305         }
 306
 307         /**
 308          * Fetch (and decompress if necessary) the stored text of the most
 309          * recently edited deleted revision of the page.
 310          *
 311          * If there are no archived revisions for the page, returns NULL.
 312          *
 313          * @return string|null
 314          */
 315         function getLastRevisionText() {
 316                 $dbr = wfGetDB( DB_SLAVE );
 317                 $row = $dbr->selectRow( 'archive',
 318                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 319                         array( 'ar_namespace' => $this->title->getNamespace(),
 320                                 'ar_title' => $this->title->getDBkey() ),
 321                         __METHOD__,
 322                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 323
 324                 if ( $row ) {
 325                         return $this->getTextFromRow( $row );
 326                 }
 327
 328                 return null;
 329         }
 330
 331         /**
 332          * Quick check if any archived revisions are present for the page.
 333          *
 334          * @return bool
 335          */
 336         function isDeleted() {
 337                 $dbr = wfGetDB( DB_SLAVE );
 338                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 339                         array( 'ar_namespace' => $this->title->getNamespace(),
 340                                 'ar_title' => $this->title->getDBkey() ),
 341                         __METHOD__
 342                 );
 343
 344                 return ( $n > 0 );
 345         }
 346
 347         /**
 348          * Restore the given (or all) text and file revisions for the page.
 349          * Once restored, the items will be removed from the archive tables.
 350          * The deletion log will be updated with an undeletion notice.
 351          *
 352          * @param array $timestamps Pass an empty array to restore all revisions,
 353          *   otherwise list the ones to undelete.
 354          * @param string $comment
 355          * @param array $fileVersions
 356          * @param bool $unsuppress
 357          * @param User $user User performing the action, or null to use $wgUser
 358          * @return array(number of file revisions restored, number of image revisions
 359          *   restored, log message) on success, false on failure.
 360          */
 361         function undelete( $timestamps, $comment = '', $fileVersions = array(),
 362                 $unsuppress = false, User $user = null
 363         ) {
 364                 // If both the set of text revisions and file revisions are empty,
 365                 // restore everything. Otherwise, just restore the requested items.
 366                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 367
 368                 $restoreText = $restoreAll || !empty( $timestamps );
 369                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 370
 371                 if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 372                         $img = wfLocalFile( $this->title );
 373                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 374                         if ( !$this->fileStatus->isOK() ) {
 375                                 return false;
 376                         }
 377                         $filesRestored = $this->fileStatus->successCount;
 378                 } else {
 379                         $filesRestored = 0;
 380                 }
 381
 382                 if ( $restoreText ) {
 383                         $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 384                         if ( !$this->revisionStatus->isOK() ) {
 385                                 return false;
 386                         }
 387
 388                         $textRestored = $this->revisionStatus->getValue();
 389                 } else {
 390                         $textRestored = 0;
 391                 }
 392
 393                 // Touch the log!
 394
 395                 if ( $textRestored && $filesRestored ) {
 396                         $reason = wfMessage( 'undeletedrevisions-files' )
 397                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 398                 } elseif ( $textRestored ) {
 399                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 400                                 ->inContentLanguage()->text();
 401                 } elseif ( $filesRestored ) {
 402                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 403                                 ->inContentLanguage()->text();
 404                 } else {
 405                         wfDebug( "Undelete: nothing undeleted...\n" );
 406
 407                         return false;
 408                 }
 409
 410                 if ( trim( $comment ) != '' ) {
 411                         $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
 412                 }
 413
 414                 if ( $user === null ) {
 415                         global $wgUser;
 416                         $user = $wgUser;
 417                 }
 418
 419                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 420                 $logEntry->setPerformer( $user );
 421                 $logEntry->setTarget( $this->title );
 422                 $logEntry->setComment( $reason );
 423
 424                 Hooks::run( 'ArticleUndeleteLogEntry', array( $this, &$logEntry, $user ) );
 425
 426                 $logid = $logEntry->insert();
 427                 $logEntry->publish( $logid );
 428
 429                 return array( $textRestored, $filesRestored, $reason );
 430         }
 431
 432         /**
 433          * This is the meaty bit -- restores archived revisions of the given page
 434          * to the cur/old tables. If the page currently exists, all revisions will
 435          * be stuffed into old, otherwise the most recent will go into cur.
 436          *
 437          * @param array $timestamps Pass an empty array to restore all revisions,
 438          *   otherwise list the ones to undelete.
 439          * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
 440          * @param string $comment
 441          * @throws ReadOnlyError
 442          * @return Status Status object containing the number of revisions restored on success
 443          */
 444         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 445                 if ( wfReadOnly() ) {
 446                         throw new ReadOnlyError();
 447                 }
 448
 449                 $restoreAll = empty( $timestamps );
 450                 $dbw = wfGetDB( DB_MASTER );
 451
 452                 # Does this page already exist? We'll have to update it...
 453                 $article = WikiPage::factory( $this->title );
 454                 # Load latest data for the current page (bug 31179)
 455                 $article->loadPageData( 'fromdbmaster' );
 456                 $oldcountable = $article->isCountable();
 457
 458                 $page = $dbw->selectRow( 'page',
 459                         array( 'page_id', 'page_latest' ),
 460                         array( 'page_namespace' => $this->title->getNamespace(),
 461                                 'page_title' => $this->title->getDBkey() ),
 462                         __METHOD__,
 463                         array( 'FOR UPDATE' ) // lock page
 464                 );
 465
 466                 if ( $page ) {
 467                         $makepage = false;
 468                         # Page already exists. Import the history, and if necessary
 469                         # we'll update the latest revision field in the record.
 470
 471                         $previousRevId = $page->page_latest;
 472
 473                         # Get the time span of this page
 474                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 475                                 array( 'rev_id' => $previousRevId ),
 476                                 __METHOD__ );
 477
 478                         if ( $previousTimestamp === false ) {
 479                                 wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
 480
 481                                 $status = Status::newGood( 0 );
 482                                 $status->warning( 'undeleterevision-missing' );
 483
 484                                 return $status;
 485                         }
 486                 } else {
 487                         # Have to create a new article...
 488                         $makepage = true;
 489                         $previousRevId = 0;
 490                         $previousTimestamp = 0;
 491                 }
 492
 493                 $oldWhere = array(
 494                         'ar_namespace' => $this->title->getNamespace(),
 495                         'ar_title' => $this->title->getDBkey(),
 496                 );
 497                 if ( !$restoreAll ) {
 498                         $oldWhere['ar_timestamp'] = array_map( array( &$dbw, 'timestamp' ), $timestamps );
 499                 }
 500
 501                 $fields = array(
 502                         'ar_rev_id',
 503                         'ar_text',
 504                         'ar_comment',
 505                         'ar_user',
 506                         'ar_user_text',
 507                         'ar_timestamp',
 508                         'ar_minor_edit',
 509                         'ar_flags',
 510                         'ar_text_id',
 511                         'ar_deleted',
 512                         'ar_page_id',
 513                         'ar_len',
 514                         'ar_sha1'
 515                 );
 516
 517                 if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
 518                         $fields[] = 'ar_content_format';
 519                         $fields[] = 'ar_content_model';
 520                 }
 521
 522                 /**
 523                  * Select each archived revision...
 524                  */
 525                 $result = $dbw->select( 'archive',
 526                         $fields,
 527                         $oldWhere,
 528                         __METHOD__,
 529                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 530                 );
 531
 532                 $rev_count = $result->numRows();
 533                 if ( !$rev_count ) {
 534                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 535
 536                         $status = Status::newGood( 0 );
 537                         $status->warning( "undelete-no-results" );
 538
 539                         return $status;
 540                 }
 541
 542                 $result->seek( $rev_count - 1 ); // move to last
 543                 $row = $result->fetchObject(); // get newest archived rev
 544                 $oldPageId = (int)$row->ar_page_id; // pass this to ArticleUndelete hook
 545                 $result->seek( 0 ); // move back
 546
 547                 // grab the content to check consistency with global state before restoring the page.
 548                 $revision = Revision::newFromArchiveRow( $row,
 549                         array(
 550                                 'title' => $article->getTitle(), // used to derive default content model
 551                         )
 552                 );
 553                 $user = User::newFromName( $revision->getUserText( Revision::RAW ), false );
 554                 $content = $revision->getContent( Revision::RAW );
 555
 556                 //NOTE: article ID may not be known yet. prepareSave() should not modify the database.
 557                 $status = $content->prepareSave( $article, 0, -1, $user );
 558
 559                 if ( !$status->isOK() ) {
 560                         return $status;
 561                 }
 562
 563                 if ( $makepage ) {
 564                         // Check the state of the newest to-be version...
 565                         if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 566                                 return Status::newFatal( "undeleterevdel" );
 567                         }
 568                         // Safe to insert now...
 569                         $newid = $article->insertOn( $dbw );
 570                         $pageId = $newid;
 571                 } else {
 572                         // Check if a deleted revision will become the current revision...
 573                         if ( $row->ar_timestamp > $previousTimestamp ) {
 574                                 // Check the state of the newest to-be version...
 575                                 if ( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 576                                         return Status::newFatal( "undeleterevdel" );
 577                                 }
 578                         }
 579
 580                         $newid = false;
 581                         $pageId = $article->getId();
 582                 }
 583
 584                 $revision = null;
 585                 $restored = 0;
 586
 587                 foreach ( $result as $row ) {
 588                         // Check for key dupes due to shitty archive integrity.
 589                         if ( $row->ar_rev_id ) {
 590                                 $exists = $dbw->selectField( 'revision', '1',
 591                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 592                                 if ( $exists ) {
 593                                         continue; // don't throw DB errors
 594                                 }
 595                         }
 596                         // Insert one revision at a time...maintaining deletion status
 597                         // unless we are specifically removing all restrictions...
 598                         $revision = Revision::newFromArchiveRow( $row,
 599                                 array(
 600                                         'page' => $pageId,
 601                                         'title' => $this->title,
 602                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 603                                 ) );
 604
 605                         $revision->insertOn( $dbw );
 606                         $restored++;
 607
 608                         Hooks::run( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 609                 }
 610                 # Now that it's safely stored, take it out of the archive
 611                 $dbw->delete( 'archive',
 612                         $oldWhere,
 613                         __METHOD__ );
 614
 615                 // Was anything restored at all?
 616                 if ( $restored == 0 ) {
 617                         return Status::newGood( 0 );
 618                 }
 619
 620                 $created = (bool)$newid;
 621
 622                 // Attach the latest revision to the page...
 623                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 624                 if ( $created || $wasnew ) {
 625                         // Update site stats, link tables, etc
 626                         $user = User::newFromName( $revision->getUserText( Revision::RAW ), false );
 627                         $article->doEditUpdates(
 628                                 $revision,
 629                                 $user,
 630                                 array( 'created' => $created, 'oldcountable' => $oldcountable )
 631                         );
 632                 }
 633
 634                 Hooks::run( 'ArticleUndelete', array( &$this->title, $created, $comment, $oldPageId ) );
 635
 636                 if ( $this->title->getNamespace() == NS_FILE ) {
 637                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 638                         $update->doUpdate();
 639                 }
 640
 641                 return Status::newGood( $restored );
 642         }
 643
 644         /**
 645          * @return Status
 646          */
 647         function getFileStatus() {
 648                 return $this->fileStatus;
 649         }
 650
 651         /**
 652          * @return Status
 653          */
 654         function getRevisionStatus() {
 655                 return $this->revisionStatus;
 656         }
 657 }
 658
 659 /**
 660  * Special page allowing users with the appropriate permissions to view
 661  * and restore deleted content.
 662  *
 663  * @ingroup SpecialPage
 664  */
 665 class SpecialUndelete extends SpecialPage {
 666         private $mAction;
 667         private $mTarget;
 668         private $mTimestamp;
 669         private $mRestore;
 670         private $mInvert;
 671         private $mFilename;
 672         private $mTargetTimestamp;
 673         private $mAllowed;
 674         private $mCanView;
 675         private $mComment;
 676         private $mToken;
 677
 678         /** @var Title */
 679         private $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 ( $this->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 719                         $this->mAllowed = true; // user can restore
 720                         $this->mCanView = true; // user can view content
 721                 } elseif ( $this->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         /**
 751          * Checks whether a user is allowed the permission for the
 752          * specific title if one is set.
 753          *
 754          * @param string $permission
 755          * @param User $user
 756          * @return bool
 757          */
 758         private function isAllowed( $permission, User $user = null ) {
 759                 $user = $user ? : $this->getUser();
 760                 if ( $this->mTargetObj !== null ) {
 761                         return $this->mTargetObj->userCan( $permission, $user );
 762                 } else {
 763                         return $user->isAllowed( $permission );
 764                 }
 765         }
 766
 767         function userCanExecute( User $user ) {
 768                 return $this->isAllowed( $this->mRestriction, $user );
 769         }
 770
 771         function execute( $par ) {
 772                 $user = $this->getUser();
 773
 774                 $this->setHeaders();
 775                 $this->outputHeader();
 776
 777                 $this->loadRequest( $par );
 778                 $this->checkPermissions(); // Needs to be after mTargetObj is set
 779
 780                 $out = $this->getOutput();
 781
 782                 if ( is_null( $this->mTargetObj ) ) {
 783                         $out->addWikiMsg( 'undelete-header' );
 784
 785                         # Not all users can just browse every deleted page from the list
 786                         if ( $user->isAllowed( 'browsearchive' ) ) {
 787                                 $this->showSearchForm();
 788                         }
 789
 790                         return;
 791                 }
 792
 793                 $out->addHelpLink( 'Help:Undelete' );
 794                 if ( $this->mAllowed ) {
 795                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 796                 } else {
 797                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 798                 }
 799
 800                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 801
 802                 if ( $this->mTimestamp !== '' ) {
 803                         $this->showRevision( $this->mTimestamp );
 804                 } elseif ( $this->mFilename !== null && $this->mTargetObj->inNamespace( NS_FILE ) ) {
 805                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 806                         // Check if user is allowed to see this file
 807                         if ( !$file->exists() ) {
 808                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 809                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 810                                 if ( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 811                                         throw new PermissionsError( 'suppressrevision' );
 812                                 } else {
 813                                         throw new PermissionsError( 'deletedtext' );
 814                                 }
 815                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 816                                 $this->showFileConfirmationForm( $this->mFilename );
 817                         } else {
 818                                 $this->showFile( $this->mFilename );
 819                         }
 820                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 821                         $this->undelete();
 822                 } else {
 823                         $this->showHistory();
 824                 }
 825         }
 826
 827         function showSearchForm() {
 828                 $out = $this->getOutput();
 829                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 830                 $out->addHTML(
 831                         Xml::openElement( 'form', array( 'method' => 'get', 'action' => wfScript() ) ) .
 832                                 Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 833                                 Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
 834                                 Html::rawElement(
 835                                         'label',
 836                                         array( 'for' => 'prefix' ),
 837                                         $this->msg( 'undelete-search-prefix' )->parse()
 838                                 ) .
 839                                 Xml::input(
 840                                         'prefix',
 841                                         20,
 842                                         $this->mSearchPrefix,
 843                                         array( 'id' => 'prefix', 'autofocus' => true )
 844                                 ) . ' ' .
 845                                 Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 846                                 Xml::closeElement( 'fieldset' ) .
 847                                 Xml::closeElement( 'form' )
 848                 );
 849
 850                 # List undeletable articles
 851                 if ( $this->mSearchPrefix ) {
 852                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 853                         $this->showList( $result );
 854                 }
 855         }
 856
 857         /**
 858          * Generic list of deleted pages
 859          *
 860          * @param ResultWrapper $result
 861          * @return bool
 862          */
 863         private function showList( $result ) {
 864                 $out = $this->getOutput();
 865
 866                 if ( $result->numRows() == 0 ) {
 867                         $out->addWikiMsg( 'undelete-no-results' );
 868
 869                         return false;
 870                 }
 871
 872                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 873
 874                 $undelete = $this->getPageTitle();
 875                 $out->addHTML( "<ul>\n" );
 876                 foreach ( $result as $row ) {
 877                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 878                         if ( $title !== null ) {
 879                                 $item = Linker::linkKnown(
 880                                         $undelete,
 881                                         htmlspecialchars( $title->getPrefixedText() ),
 882                                         array(),
 883                                         array( 'target' => $title->getPrefixedText() )
 884                                 );
 885                         } else {
 886                                 // The title is no longer valid, show as text
 887                                 $item = Html::element(
 888                                         'span',
 889                                         array( 'class' => 'mw-invalidtitle' ),
 890                                         Linker::getInvalidTitleDescription(
 891                                                 $this->getContext(),
 892                                                 $row->ar_namespace,
 893                                                 $row->ar_title
 894                                         )
 895                                 );
 896                         }
 897                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 898                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 899                 }
 900                 $result->free();
 901                 $out->addHTML( "</ul>\n" );
 902
 903                 return true;
 904         }
 905
 906         private function showRevision( $timestamp ) {
 907                 if ( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 908                         return;
 909                 }
 910
 911                 $archive = new PageArchive( $this->mTargetObj, $this->getConfig() );
 912                 if ( !Hooks::run( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) ) ) {
 913                         return;
 914                 }
 915                 $rev = $archive->getRevision( $timestamp );
 916
 917                 $out = $this->getOutput();
 918                 $user = $this->getUser();
 919
 920                 if ( !$rev ) {
 921                         $out->addWikiMsg( 'undeleterevision-missing' );
 922
 923                         return;
 924                 }
 925
 926                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 927                         if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 928                                 $out->wrapWikiMsg(
 929                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 930                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ) ?
 931                                         'rev-suppressed-text-permission' : 'rev-deleted-text-permission'
 932                                 );
 933
 934                                 return;
 935                         }
 936
 937                         $out->wrapWikiMsg(
 938                                 "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 939                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ) ?
 940                                         'rev-suppressed-text-view' : 'rev-deleted-text-view'
 941                         );
 942                         $out->addHTML( '<br />' );
 943                         // and we are allowed to see...
 944                 }
 945
 946                 if ( $this->mDiff ) {
 947                         $previousRev = $archive->getPreviousRevision( $timestamp );
 948                         if ( $previousRev ) {
 949                                 $this->showDiff( $previousRev, $rev );
 950                                 if ( $this->mDiffOnly ) {
 951                                         return;
 952                                 }
 953
 954                                 $out->addHTML( '<hr />' );
 955                         } else {
 956                                 $out->addWikiMsg( 'undelete-nodiff' );
 957                         }
 958                 }
 959
 960                 $link = Linker::linkKnown(
 961                         $this->getPageTitle( $this->mTargetObj->getPrefixedDBkey() ),
 962                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 963                 );
 964
 965                 $lang = $this->getLanguage();
 966
 967                 // date and time are separate parameters to facilitate localisation.
 968                 // $time is kept for backward compat reasons.
 969                 $time = $lang->userTimeAndDate( $timestamp, $user );
 970                 $d = $lang->userDate( $timestamp, $user );
 971                 $t = $lang->userTime( $timestamp, $user );
 972                 $userLink = Linker::revUserTools( $rev );
 973
 974                 $content = $rev->getContent( Revision::FOR_THIS_USER, $user );
 975
 976                 $isText = ( $content instanceof TextContent );
 977
 978                 if ( $this->mPreview || $isText ) {
 979                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 980                 } else {
 981                         $openDiv = '<div id="mw-undelete-revision">';
 982                 }
 983                 $out->addHTML( $openDiv );
 984
 985                 // Revision delete links
 986                 if ( !$this->mDiff ) {
 987                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 988                         if ( $revdel ) {
 989                                 $out->addHTML( "$revdel " );
 990                         }
 991                 }
 992
 993                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 994                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 995
 996                 if ( !Hooks::run( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) ) ) {
 997                         return;
 998                 }
 999
1000                 if ( $this->mPreview || !$isText ) {
1001                         // NOTE: non-text content has no source view, so always use rendered preview
1002
1003                         // Hide [edit]s
1004                         $popts = $out->parserOptions();
1005                         $popts->setEditSection( false );
1006
1007                         $pout = $content->getParserOutput( $this->mTargetObj, $rev->getId(), $popts, true );
1008                         $out->addParserOutput( $pout );
1009                 }
1010
1011                 if ( $isText ) {
1012                         // source view for textual content
1013                         $sourceView = Xml::element(
1014                                 'textarea',
1015                                 array(
1016                                         'readonly' => 'readonly',
1017                                         'cols' => $user->getIntOption( 'cols' ),
1018                                         'rows' => $user->getIntOption( 'rows' )
1019                                 ),
1020                                 $content->getNativeData() . "\n"
1021                         );
1022
1023                         $previewButton = Xml::element( 'input', array(
1024                                 'type' => 'submit',
1025                                 'name' => 'preview',
1026                                 'value' => $this->msg( 'showpreview' )->text()
1027                         ) );
1028                 } else {
1029                         $sourceView = '';
1030                         $previewButton = '';
1031                 }
1032
1033                 $diffButton = Xml::element( 'input', array(
1034                         'name' => 'diff',
1035                         'type' => 'submit',
1036                         'value' => $this->msg( 'showdiff' )->text() ) );
1037
1038                 $out->addHTML(
1039                         $sourceView .
1040                                 Xml::openElement( 'div', array(
1041                                         'style' => 'clear: both' ) ) .
1042                                 Xml::openElement( 'form', array(
1043                                         'method' => 'post',
1044                                         'action' => $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
1045                                 Xml::element( 'input', array(
1046                                         'type' => 'hidden',
1047                                         'name' => 'target',
1048                                         'value' => $this->mTargetObj->getPrefixedDBkey() ) ) .
1049                                 Xml::element( 'input', array(
1050                                         'type' => 'hidden',
1051                                         'name' => 'timestamp',
1052                                         'value' => $timestamp ) ) .
1053                                 Xml::element( 'input', array(
1054                                         'type' => 'hidden',
1055                                         'name' => 'wpEditToken',
1056                                         'value' => $user->getEditToken() ) ) .
1057                                 $previewButton .
1058                                 $diffButton .
1059                                 Xml::closeElement( 'form' ) .
1060                                 Xml::closeElement( 'div' )
1061                 );
1062         }
1063
1064         /**
1065          * Build a diff display between this and the previous either deleted
1066          * or non-deleted edit.
1067          *
1068          * @param Revision $previousRev
1069          * @param Revision $currentRev
1070          * @return string HTML
1071          */
1072         function showDiff( $previousRev, $currentRev ) {
1073                 $diffContext = clone $this->getContext();
1074                 $diffContext->setTitle( $currentRev->getTitle() );
1075                 $diffContext->setWikiPage( WikiPage::factory( $currentRev->getTitle() ) );
1076
1077                 $diffEngine = $currentRev->getContentHandler()->createDifferenceEngine( $diffContext );
1078                 $diffEngine->showDiffStyle();
1079
1080                 $formattedDiff = $diffEngine->generateContentDiffBody(
1081                         $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
1082                         $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() )
1083                 );
1084
1085                 $formattedDiff = $diffEngine->addHeader(
1086                         $formattedDiff,
1087                         $this->diffHeader( $previousRev, 'o' ),
1088                         $this->diffHeader( $currentRev, 'n' )
1089                 );
1090
1091                 $this->getOutput()->addHTML( "<div>$formattedDiff</div>\n" );
1092         }
1093
1094         /**
1095          * @param Revision $rev
1096          * @param string $prefix
1097          * @return string
1098          */
1099         private function diffHeader( $rev, $prefix ) {
1100                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
1101                 if ( $isDeleted ) {
1102                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
1103                         $targetPage = $this->getPageTitle();
1104                         $targetQuery = array(
1105                                 'target' => $this->mTargetObj->getPrefixedText(),
1106                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
1107                         );
1108                 } else {
1109                         /// @todo FIXME: getId() may return non-zero for deleted revs...
1110                         $targetPage = $rev->getTitle();
1111                         $targetQuery = array( 'oldid' => $rev->getId() );
1112                 }
1113
1114                 // Add show/hide deletion links if available
1115                 $user = $this->getUser();
1116                 $lang = $this->getLanguage();
1117                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1118
1119                 if ( $rdel ) {
1120                         $rdel = " $rdel";
1121                 }
1122
1123                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1124
1125                 $tags = wfGetDB( DB_SLAVE )->selectField(
1126                         'tag_summary',
1127                         'ts_tags',
1128                         array( 'ts_rev_id' => $rev->getId() ),
1129                         __METHOD__
1130                 );
1131                 $tagSummary = ChangeTags::formatSummaryRow( $tags, 'deleteddiff' );
1132
1133                 // FIXME This is reimplementing DifferenceEngine#getRevisionHeader
1134                 // and partially #showDiffPage, but worse
1135                 return '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1136                         Linker::link(
1137                                 $targetPage,
1138                                 $this->msg(
1139                                         'revisionasof',
1140                                         $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
1141                                         $lang->userDate( $rev->getTimestamp(), $user ),
1142                                         $lang->userTime( $rev->getTimestamp(), $user )
1143                                 )->escaped(),
1144                                 array(),
1145                                 $targetQuery
1146                         ) .
1147                         '</strong></div>' .
1148                         '<div id="mw-diff-' . $prefix . 'title2">' .
1149                         Linker::revUserTools( $rev ) . '<br />' .
1150                         '</div>' .
1151                         '<div id="mw-diff-' . $prefix . 'title3">' .
1152                         $minor . Linker::revComment( $rev ) . $rdel . '<br />' .
1153                         '</div>' .
1154                         '<div id="mw-diff-' . $prefix . 'title5">' .
1155                         $tagSummary[0] . '<br />' .
1156                         '</div>';
1157         }
1158
1159         /**
1160          * Show a form confirming whether a tokenless user really wants to see a file
1161          * @param string $key
1162          */
1163         private function showFileConfirmationForm( $key ) {
1164                 $out = $this->getOutput();
1165                 $lang = $this->getLanguage();
1166                 $user = $this->getUser();
1167                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1168                 $out->addWikiMsg( 'undelete-show-file-confirm',
1169                         $this->mTargetObj->getText(),
1170                         $lang->userDate( $file->getTimestamp(), $user ),
1171                         $lang->userTime( $file->getTimestamp(), $user ) );
1172                 $out->addHTML(
1173                         Xml::openElement( 'form', array(
1174                                         'method' => 'POST',
1175                                         'action' => $this->getPageTitle()->getLocalURL( array(
1176                                                 'target' => $this->mTarget,
1177                                                 'file' => $key,
1178                                                 'token' => $user->getEditToken( $key ),
1179                                         ) ),
1180                                 )
1181                         ) .
1182                                 Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1183                                 '</form>'
1184                 );
1185         }
1186
1187         /**
1188          * Show a deleted file version requested by the visitor.
1189          * @param string $key
1190          */
1191         private function showFile( $key ) {
1192                 $this->getOutput()->disable();
1193
1194                 # We mustn't allow the output to be Squid cached, otherwise
1195                 # if an admin previews a deleted image, and it's cached, then
1196                 # a user without appropriate permissions can toddle off and
1197                 # nab the image, and Squid will serve it
1198                 $response = $this->getRequest()->response();
1199                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1200                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1201                 $response->header( 'Pragma: no-cache' );
1202
1203                 $repo = RepoGroup::singleton()->getLocalRepo();
1204                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1205                 $repo->streamFile( $path );
1206         }
1207
1208         private function showHistory() {
1209                 $out = $this->getOutput();
1210                 if ( $this->mAllowed ) {
1211                         $out->addModules( 'mediawiki.special.undelete' );
1212                 }
1213                 $out->wrapWikiMsg(
1214                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1215                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1216                 );
1217
1218                 $archive = new PageArchive( $this->mTargetObj, $this->getConfig() );
1219                 Hooks::run( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1220                 /*
1221                 $text = $archive->getLastRevisionText();
1222                 if( is_null( $text ) ) {
1223                         $out->addWikiMsg( 'nohistory' );
1224                         return;
1225                 }
1226                 */
1227                 $out->addHTML( '<div class="mw-undelete-history">' );
1228                 if ( $this->mAllowed ) {
1229                         $out->addWikiMsg( 'undeletehistory' );
1230                         $out->addWikiMsg( 'undeleterevdel' );
1231                 } else {
1232                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1233                 }
1234                 $out->addHTML( '</div>' );
1235
1236                 # List all stored revisions
1237                 $revisions = $archive->listRevisions();
1238                 $files = $archive->listFiles();
1239
1240                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1241                 $haveFiles = $files && $files->numRows() > 0;
1242
1243                 # Batch existence check on user and talk pages
1244                 if ( $haveRevisions ) {
1245                         $batch = new LinkBatch();
1246                         foreach ( $revisions as $row ) {
1247                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1248                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1249                         }
1250                         $batch->execute();
1251                         $revisions->seek( 0 );
1252                 }
1253                 if ( $haveFiles ) {
1254                         $batch = new LinkBatch();
1255                         foreach ( $files as $row ) {
1256                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1257                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1258                         }
1259                         $batch->execute();
1260                         $files->seek( 0 );
1261                 }
1262
1263                 if ( $this->mAllowed ) {
1264                         $action = $this->getPageTitle()->getLocalURL( array( 'action' => 'submit' ) );
1265                         # Start the form here
1266                         $top = Xml::openElement(
1267                                 'form',
1268                                 array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' )
1269                         );
1270                         $out->addHTML( $top );
1271                 }
1272
1273                 # Show relevant lines from the deletion log:
1274                 $deleteLogPage = new LogPage( 'delete' );
1275                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1276                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1277                 # Show relevant lines from the suppression log:
1278                 $suppressLogPage = new LogPage( 'suppress' );
1279                 if ( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1280                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1281                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1282                 }
1283
1284                 if ( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1285                         # Format the user-visible controls (comment field, submission button)
1286                         # in a nice little table
1287                         if ( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1288                                 $unsuppressBox =
1289                                         "<tr>
1290                                                 <td>&#160;</td>
1291                                                 <td class='mw-input'>" .
1292                                                 Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1293                                                         'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ) .
1294                                                 "</td>
1295                                         </tr>";
1296                         } else {
1297                                 $unsuppressBox = '';
1298                         }
1299
1300                         $table = Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1301                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1302                                 "<tr>
1303                                         <td colspan='2' class='mw-undelete-extrahelp'>" .
1304                                 $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1305                                 "</td>
1306                         </tr>
1307                         <tr>
1308                                 <td class='mw-label'>" .
1309                                 Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1310                                 "</td>
1311                                 <td class='mw-input'>" .
1312                                 Xml::input(
1313                                         'wpComment',
1314                                         50,
1315                                         $this->mComment,
1316                                         array( 'id' => 'wpComment', 'autofocus' => true )
1317                                 ) .
1318                                 "</td>
1319                         </tr>
1320                         <tr>
1321                                 <td>&#160;</td>
1322                                 <td class='mw-submit'>" .
1323                                 Xml::submitButton(
1324                                         $this->msg( 'undeletebtn' )->text(),
1325                                         array( 'name' => 'restore', 'id' => 'mw-undelete-submit' )
1326                                 ) . ' ' .
1327                                 Xml::submitButton(
1328                                         $this->msg( 'undeleteinvert' )->text(),
1329                                         array( 'name' => 'invert', 'id' => 'mw-undelete-invert' )
1330                                 ) .
1331                                 "</td>
1332                         </tr>" .
1333                                 $unsuppressBox .
1334                                 Xml::closeElement( 'table' ) .
1335                                 Xml::closeElement( 'fieldset' );
1336
1337                         $out->addHTML( $table );
1338                 }
1339
1340                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1341
1342                 if ( $haveRevisions ) {
1343                         # The page's stored (deleted) history:
1344                         $out->addHTML( '<ul>' );
1345                         $remaining = $revisions->numRows();
1346                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1347
1348                         foreach ( $revisions as $row ) {
1349                                 $remaining--;
1350                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1351                         }
1352                         $revisions->free();
1353                         $out->addHTML( '</ul>' );
1354                 } else {
1355                         $out->addWikiMsg( 'nohistory' );
1356                 }
1357
1358                 if ( $haveFiles ) {
1359                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1360                         $out->addHTML( '<ul>' );
1361                         foreach ( $files as $row ) {
1362                                 $out->addHTML( $this->formatFileRow( $row ) );
1363                         }
1364                         $files->free();
1365                         $out->addHTML( '</ul>' );
1366                 }
1367
1368                 if ( $this->mAllowed ) {
1369                         # Slip in the hidden controls here
1370                         $misc = Html::hidden( 'target', $this->mTarget );
1371                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1372                         $misc .= Xml::closeElement( 'form' );
1373                         $out->addHTML( $misc );
1374                 }
1375
1376                 return true;
1377         }
1378
1379         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1380                 $rev = Revision::newFromArchiveRow( $row,
1381                         array(
1382                                 'title' => $this->mTargetObj
1383                         ) );
1384
1385                 $revTextSize = '';
1386                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1387                 // Build checkboxen...
1388                 if ( $this->mAllowed ) {
1389                         if ( $this->mInvert ) {
1390                                 if ( in_array( $ts, $this->mTargetTimestamp ) ) {
1391                                         $checkBox = Xml::check( "ts$ts" );
1392                                 } else {
1393                                         $checkBox = Xml::check( "ts$ts", true );
1394                                 }
1395                         } else {
1396                                 $checkBox = Xml::check( "ts$ts" );
1397                         }
1398                 } else {
1399                         $checkBox = '';
1400                 }
1401
1402                 // Build page & diff links...
1403                 $user = $this->getUser();
1404                 if ( $this->mCanView ) {
1405                         $titleObj = $this->getPageTitle();
1406                         # Last link
1407                         if ( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1408                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1409                                 $last = $this->msg( 'diff' )->escaped();
1410                         } elseif ( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1411                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1412                                 $last = Linker::linkKnown(
1413                                         $titleObj,
1414                                         $this->msg( 'diff' )->escaped(),
1415                                         array(),
1416                                         array(
1417                                                 'target' => $this->mTargetObj->getPrefixedText(),
1418                                                 'timestamp' => $ts,
1419                                                 'diff' => 'prev'
1420                                         )
1421                                 );
1422                         } else {
1423                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1424                                 $last = $this->msg( 'diff' )->escaped();
1425                         }
1426                 } else {
1427                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1428                         $last = $this->msg( 'diff' )->escaped();
1429                 }
1430
1431                 // User links
1432                 $userLink = Linker::revUserTools( $rev );
1433
1434                 // Minor edit
1435                 $minor = $rev->isMinor() ? ChangesList::flag( 'minor' ) : '';
1436
1437                 // Revision text size
1438                 $size = $row->ar_len;
1439                 if ( !is_null( $size ) ) {
1440                         $revTextSize = Linker::formatRevisionSize( $size );
1441                 }
1442
1443                 // Edit summary
1444                 $comment = Linker::revComment( $rev );
1445
1446                 // Tags
1447                 $attribs = array();
1448                 list( $tagSummary, $classes ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'deletedhistory' );
1449                 if ( $classes ) {
1450                         $attribs['class'] = implode( ' ', $classes );
1451                 }
1452
1453                 // Revision delete links
1454                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1455
1456                 $revisionRow = $this->msg( 'undelete-revision-row' )
1457                         ->rawParams(
1458                                 $checkBox,
1459                                 $revdlink,
1460                                 $last,
1461                                 $pageLink,
1462                                 $userLink,
1463                                 $minor,
1464                                 $revTextSize,
1465                                 $comment,
1466                                 $tagSummary
1467                         )
1468                         ->escaped();
1469
1470                 return Xml::tags( 'li', $attribs, $revisionRow ) . "\n";
1471         }
1472
1473         private function formatFileRow( $row ) {
1474                 $file = ArchivedFile::newFromRow( $row );
1475                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1476                 $user = $this->getUser();
1477
1478                 $checkBox = '';
1479                 if ( $this->mCanView && $row->fa_storage_key ) {
1480                         if ( $this->mAllowed ) {
1481                                 $checkBox = Xml::check( 'fileid' . $row->fa_id );
1482                         }
1483                         $key = urlencode( $row->fa_storage_key );
1484                         $pageLink = $this->getFileLink( $file, $this->getPageTitle(), $ts, $key );
1485                 } else {
1486                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1487                 }
1488                 $userLink = $this->getFileUser( $file );
1489                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1490                 $bytes = $this->msg( 'parentheses' )
1491                         ->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )
1492                         ->plain();
1493                 $data = htmlspecialchars( $data . ' ' . $bytes );
1494                 $comment = $this->getFileComment( $file );
1495
1496                 // Add show/hide deletion links if available
1497                 $canHide = $this->isAllowed( 'deleterevision' );
1498                 if ( $canHide || ( $file->getVisibility() && $this->isAllowed( 'deletedhistory' ) ) ) {
1499                         if ( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1500                                 // Revision was hidden from sysops
1501                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide );
1502                         } else {
1503                                 $query = array(
1504                                         'type' => 'filearchive',
1505                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1506                                         'ids' => $row->fa_id
1507                                 );
1508                                 $revdlink = Linker::revDeleteLink( $query,
1509                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1510                         }
1511                 } else {
1512                         $revdlink = '';
1513                 }
1514
1515                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1516         }
1517
1518         /**
1519          * Fetch revision text link if it's available to all users
1520          *
1521          * @param Revision $rev
1522          * @param Title $titleObj
1523          * @param string $ts Timestamp
1524          * @return string
1525          */
1526         function getPageLink( $rev, $titleObj, $ts ) {
1527                 $user = $this->getUser();
1528                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1529
1530                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1531                         return '<span class="history-deleted">' . $time . '</span>';
1532                 }
1533
1534                 $link = Linker::linkKnown(
1535                         $titleObj,
1536                         htmlspecialchars( $time ),
1537                         array(),
1538                         array(
1539                                 'target' => $this->mTargetObj->getPrefixedText(),
1540                                 'timestamp' => $ts
1541                         )
1542                 );
1543
1544                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1545                         $link = '<span class="history-deleted">' . $link . '</span>';
1546                 }
1547
1548                 return $link;
1549         }
1550
1551         /**
1552          * Fetch image view link if it's available to all users
1553          *
1554          * @param File|ArchivedFile $file
1555          * @param Title $titleObj
1556          * @param string $ts A timestamp
1557          * @param string $key A storage key
1558          *
1559          * @return string HTML fragment
1560          */
1561         function getFileLink( $file, $titleObj, $ts, $key ) {
1562                 $user = $this->getUser();
1563                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1564
1565                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1566                         return '<span class="history-deleted">' . $time . '</span>';
1567                 }
1568
1569                 $link = Linker::linkKnown(
1570                         $titleObj,
1571                         htmlspecialchars( $time ),
1572                         array(),
1573                         array(
1574                                 'target' => $this->mTargetObj->getPrefixedText(),
1575                                 'file' => $key,
1576                                 'token' => $user->getEditToken( $key )
1577                         )
1578                 );
1579
1580                 if ( $file->isDeleted( File::DELETED_FILE ) ) {
1581                         $link = '<span class="history-deleted">' . $link . '</span>';
1582                 }
1583
1584                 return $link;
1585         }
1586
1587         /**
1588          * Fetch file's user id if it's available to this user
1589          *
1590          * @param File|ArchivedFile $file
1591          * @return string HTML fragment
1592          */
1593         function getFileUser( $file ) {
1594                 if ( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1595                         return '<span class="history-deleted">' .
1596                                 $this->msg( 'rev-deleted-user' )->escaped() .
1597                                 '</span>';
1598                 }
1599
1600                 $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1601                         Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1602
1603                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1604                         $link = '<span class="history-deleted">' . $link . '</span>';
1605                 }
1606
1607                 return $link;
1608         }
1609
1610         /**
1611          * Fetch file upload comment if it's available to this user
1612          *
1613          * @param File|ArchivedFile $file
1614          * @return string HTML fragment
1615          */
1616         function getFileComment( $file ) {
1617                 if ( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1618                         return '<span class="history-deleted"><span class="comment">' .
1619                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1620                 }
1621
1622                 $link = Linker::commentBlock( $file->getRawDescription() );
1623
1624                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1625                         $link = '<span class="history-deleted">' . $link . '</span>';
1626                 }
1627
1628                 return $link;
1629         }
1630
1631         function undelete() {
1632                 if ( $this->getConfig()->get( 'UploadMaintenance' )
1633                         && $this->mTargetObj->getNamespace() == NS_FILE
1634                 ) {
1635                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1636                 }
1637
1638                 if ( wfReadOnly() ) {
1639                         throw new ReadOnlyError;
1640                 }
1641
1642                 $out = $this->getOutput();
1643                 $archive = new PageArchive( $this->mTargetObj, $this->getConfig() );
1644                 Hooks::run( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1645                 $ok = $archive->undelete(
1646                         $this->mTargetTimestamp,
1647                         $this->mComment,
1648                         $this->mFileVersions,
1649                         $this->mUnsuppress,
1650                         $this->getUser()
1651                 );
1652
1653                 if ( is_array( $ok ) ) {
1654                         if ( $ok[1] ) { // Undeleted file count
1655                                 Hooks::run( 'FileUndeleteComplete', array(
1656                                         $this->mTargetObj, $this->mFileVersions,
1657                                         $this->getUser(), $this->mComment ) );
1658                         }
1659
1660                         $link = Linker::linkKnown( $this->mTargetObj );
1661                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1662                 } else {
1663                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1664                 }
1665
1666                 // Show revision undeletion warnings and errors
1667                 $status = $archive->getRevisionStatus();
1668                 if ( $status && !$status->isGood() ) {
1669                         $out->addWikiText( '<div class="error">' .
1670                                 $status->getWikiText(
1671                                         'cannotundelete',
1672                                         'cannotundelete'
1673                                 ) . '</div>'
1674                         );
1675                 }
1676
1677                 // Show file undeletion warnings and errors
1678                 $status = $archive->getFileStatus();
1679                 if ( $status && !$status->isGood() ) {
1680                         $out->addWikiText( '<div class="error">' .
1681                                 $status->getWikiText(
1682                                         'undelete-error-short',
1683                                         'undelete-error-long'
1684                                 ) . '</div>'
1685                         );
1686                 }
1687         }
1688
1689         protected function getGroupName() {
1690                 return 'pagetools';
1691         }
1692 }