includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30
  31         /**
  32          * @var Title
  33          */
  34         protected $title;
  35         var $fileStatus;
  36
  37         function __construct( $title ) {
  38                 if( is_null( $title ) ) {
  39                         throw new MWException( __METHOD__ . ' given a null title.' );
  40                 }
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * List all deleted pages recorded in the archive table. Returns result
  46          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  47          * namespace/title.
  48          *
  49          * @return ResultWrapper
  50          */
  51         public static function listAllPages() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53                 return self::listPages( $dbr, '' );
  54         }
  55
  56         /**
  57          * List deleted pages recorded in the archive table matching the
  58          * given title prefix.
  59          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  60          *
  61          * @param $prefix String: title prefix
  62          * @return ResultWrapper
  63          */
  64         public static function listPagesByPrefix( $prefix ) {
  65                 $dbr = wfGetDB( DB_SLAVE );
  66
  67                 $title = Title::newFromText( $prefix );
  68                 if( $title ) {
  69                         $ns = $title->getNamespace();
  70                         $prefix = $title->getDBkey();
  71                 } else {
  72                         // Prolly won't work too good
  73                         // @todo handle bare namespace names cleanly?
  74                         $ns = 0;
  75                 }
  76                 $conds = array(
  77                         'ar_namespace' => $ns,
  78                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  79                 );
  80                 return self::listPages( $dbr, $conds );
  81         }
  82
  83         /**
  84          * @param $dbr DatabaseBase
  85          * @param $condition
  86          * @return bool|ResultWrapper
  87          */
  88         protected static function listPages( $dbr, $condition ) {
  89                 return $dbr->resultObject(
  90                         $dbr->select(
  91                                 array( 'archive' ),
  92                                 array(
  93                                         'ar_namespace',
  94                                         'ar_title',
  95                                         'COUNT(*) AS count'
  96                                 ),
  97                                 $condition,
  98                                 __METHOD__,
  99                                 array(
 100                                         'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 101                                         'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 102                                         'LIMIT' => 100,
 103                                 )
 104                         )
 105                 );
 106         }
 107
 108         /**
 109          * List the revisions of the given page. Returns result wrapper with
 110          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 111          *
 112          * @return ResultWrapper
 113          */
 114         function listRevisions() {
 115                 global $wgContentHandlerNoDB;
 116
 117                 $dbr = wfGetDB( DB_SLAVE );
 118
 119                 $fields = array(
 120                         'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 121                         'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1',
 122                 );
 123
 124                 if ( !$wgContentHandlerNoDB ) {
 125                         $fields[] = 'ar_content_format';
 126                         $fields[] = 'ar_content_model';
 127                 }
 128
 129                 $res = $dbr->select( 'archive',
 130                         $fields,
 131                         array( 'ar_namespace' => $this->title->getNamespace(),
 132                                    'ar_title' => $this->title->getDBkey() ),
 133                         'PageArchive::listRevisions',
 134                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 135                 $ret = $dbr->resultObject( $res );
 136                 return $ret;
 137         }
 138
 139         /**
 140          * List the deleted file revisions for this page, if it's a file page.
 141          * Returns a result wrapper with various filearchive fields, or null
 142          * if not a file page.
 143          *
 144          * @return ResultWrapper
 145          * @todo Does this belong in Image for fuller encapsulation?
 146          */
 147         function listFiles() {
 148                 if( $this->title->getNamespace() == NS_FILE ) {
 149                         $dbr = wfGetDB( DB_SLAVE );
 150                         $res = $dbr->select( 'filearchive',
 151                                 array(
 152                                         'fa_id',
 153                                         'fa_name',
 154                                         'fa_archive_name',
 155                                         'fa_storage_key',
 156                                         'fa_storage_group',
 157                                         'fa_size',
 158                                         'fa_width',
 159                                         'fa_height',
 160                                         'fa_bits',
 161                                         'fa_metadata',
 162                                         'fa_media_type',
 163                                         'fa_major_mime',
 164                                         'fa_minor_mime',
 165                                         'fa_description',
 166                                         'fa_user',
 167                                         'fa_user_text',
 168                                         'fa_timestamp',
 169                                         'fa_deleted' ),
 170                                 array( 'fa_name' => $this->title->getDBkey() ),
 171                                 __METHOD__,
 172                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 173                         $ret = $dbr->resultObject( $res );
 174                         return $ret;
 175                 }
 176                 return null;
 177         }
 178
 179         /**
 180          * Return a Revision object containing data for the deleted revision.
 181          * Note that the result *may* or *may not* have a null page ID.
 182          *
 183          * @param $timestamp String
 184          * @return Revision
 185          */
 186         function getRevision( $timestamp ) {
 187                 global $wgContentHandlerNoDB;
 188
 189                 $dbr = wfGetDB( DB_SLAVE );
 190
 191                 $fields = array(
 192                         'ar_rev_id',
 193                         'ar_text',
 194                         'ar_comment',
 195                         'ar_user',
 196                         'ar_user_text',
 197                         'ar_timestamp',
 198                         'ar_minor_edit',
 199                         'ar_flags',
 200                         'ar_text_id',
 201                         'ar_deleted',
 202                         'ar_len',
 203                         'ar_sha1',
 204                 );
 205
 206                 if ( !$wgContentHandlerNoDB ) {
 207                         $fields[] = 'ar_content_format';
 208                         $fields[] = 'ar_content_model';
 209                 }
 210
 211                 $row = $dbr->selectRow( 'archive',
 212                         $fields,
 213                         array( 'ar_namespace' => $this->title->getNamespace(),
 214                                         'ar_title' => $this->title->getDBkey(),
 215                                         'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 216                         __METHOD__ );
 217                 if( $row ) {
 218                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleID() ) );
 219                 } else {
 220                         return null;
 221                 }
 222         }
 223
 224         /**
 225          * Return the most-previous revision, either live or deleted, against
 226          * the deleted revision given by timestamp.
 227          *
 228          * May produce unexpected results in case of history merges or other
 229          * unusual time issues.
 230          *
 231          * @param $timestamp String
 232          * @return Revision or null
 233          */
 234         function getPreviousRevision( $timestamp ) {
 235                 $dbr = wfGetDB( DB_SLAVE );
 236
 237                 // Check the previous deleted revision...
 238                 $row = $dbr->selectRow( 'archive',
 239                         'ar_timestamp',
 240                         array( 'ar_namespace' => $this->title->getNamespace(),
 241                                    'ar_title' => $this->title->getDBkey(),
 242                                    'ar_timestamp < ' .
 243                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 244                         __METHOD__,
 245                         array(
 246                                 'ORDER BY' => 'ar_timestamp DESC',
 247                                 'LIMIT' => 1 ) );
 248                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 249
 250                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 251                         array( 'rev_id', 'rev_timestamp' ),
 252                         array(
 253                                 'page_namespace' => $this->title->getNamespace(),
 254                                 'page_title' => $this->title->getDBkey(),
 255                                 'page_id = rev_page',
 256                                 'rev_timestamp < ' .
 257                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 258                         __METHOD__,
 259                         array(
 260                                 'ORDER BY' => 'rev_timestamp DESC',
 261                                 'LIMIT' => 1 ) );
 262                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 263                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 264
 265                 if( $prevLive && $prevLive > $prevDeleted ) {
 266                         // Most prior revision was live
 267                         return Revision::newFromId( $prevLiveId );
 268                 } elseif( $prevDeleted ) {
 269                         // Most prior revision was deleted
 270                         return $this->getRevision( $prevDeleted );
 271                 } else {
 272                         // No prior revision on this page.
 273                         return null;
 274                 }
 275         }
 276
 277         /**
 278          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 279          *
 280          * @param $row Object: database row
 281          * @return Revision
 282          */
 283         function getTextFromRow( $row ) {
 284                 if( is_null( $row->ar_text_id ) ) {
 285                         // An old row from MediaWiki 1.4 or previous.
 286                         // Text is embedded in this row in classic compression format.
 287                         return Revision::getRevisionText( $row, 'ar_' );
 288                 } else {
 289                         // New-style: keyed to the text storage backend.
 290                         $dbr = wfGetDB( DB_SLAVE );
 291                         $text = $dbr->selectRow( 'text',
 292                                 array( 'old_text', 'old_flags' ),
 293                                 array( 'old_id' => $row->ar_text_id ),
 294                                 __METHOD__ );
 295                         return Revision::getRevisionText( $text );
 296                 }
 297         }
 298
 299         /**
 300          * Fetch (and decompress if necessary) the stored text of the most
 301          * recently edited deleted revision of the page.
 302          *
 303          * If there are no archived revisions for the page, returns NULL.
 304          *
 305          * @return String
 306          */
 307         function getLastRevisionText() {
 308                 $dbr = wfGetDB( DB_SLAVE );
 309                 $row = $dbr->selectRow( 'archive',
 310                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 311                         array( 'ar_namespace' => $this->title->getNamespace(),
 312                                    'ar_title' => $this->title->getDBkey() ),
 313                         __METHOD__,
 314                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 315                 if( $row ) {
 316                         return $this->getTextFromRow( $row );
 317                 } else {
 318                         return null;
 319                 }
 320         }
 321
 322         /**
 323          * Quick check if any archived revisions are present for the page.
 324          *
 325          * @return Boolean
 326          */
 327         function isDeleted() {
 328                 $dbr = wfGetDB( DB_SLAVE );
 329                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 330                         array( 'ar_namespace' => $this->title->getNamespace(),
 331                                    'ar_title' => $this->title->getDBkey() ) );
 332                 return ( $n > 0 );
 333         }
 334
 335         /**
 336          * Restore the given (or all) text and file revisions for the page.
 337          * Once restored, the items will be removed from the archive tables.
 338          * The deletion log will be updated with an undeletion notice.
 339          *
 340          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 341          * @param $comment String
 342          * @param $fileVersions Array
 343          * @param $unsuppress Boolean
 344          * @param $user User doing the action, or null to use $wgUser
 345          *
 346          * @return array(number of file revisions restored, number of image revisions restored, log message)
 347          * on success, false on failure
 348          */
 349         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false, User $user = null ) {
 350                 global $wgContLang, $wgUser;
 351
 352                 // If both the set of text revisions and file revisions are empty,
 353                 // restore everything. Otherwise, just restore the requested items.
 354                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 355
 356                 $restoreText = $restoreAll || !empty( $timestamps );
 357                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 358
 359                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 360                         $img = wfLocalFile( $this->title );
 361                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 362                         if ( !$this->fileStatus->isOk() ) {
 363                                 return false;
 364                         }
 365                         $filesRestored = $this->fileStatus->successCount;
 366                 } else {
 367                         $filesRestored = 0;
 368                 }
 369
 370                 if( $restoreText ) {
 371                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 372                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 373                                 return false;
 374                         }
 375                 } else {
 376                         $textRestored = 0;
 377                 }
 378
 379                 // Touch the log!
 380
 381                 if( $textRestored && $filesRestored ) {
 382                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 383                                 $wgContLang->formatNum( $textRestored ),
 384                                 $wgContLang->formatNum( $filesRestored ) );
 385                 } elseif( $textRestored ) {
 386                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 387                                 $wgContLang->formatNum( $textRestored ) );
 388                 } elseif( $filesRestored ) {
 389                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 390                                 $wgContLang->formatNum( $filesRestored ) );
 391                 } else {
 392                         wfDebug( "Undelete: nothing undeleted...\n" );
 393                         return false;
 394                 }
 395
 396                 if( trim( $comment ) != '' ) {
 397                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 398                 }
 399
 400                 if ( $user === null ) {
 401                         $user = $wgUser;
 402                 }
 403
 404                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 405                 $logEntry->setPerformer( $user );
 406                 $logEntry->setTarget( $this->title );
 407                 $logEntry->setComment( $reason );
 408                 $logid = $logEntry->insert();
 409                 $logEntry->publish( $logid );
 410
 411                 return array( $textRestored, $filesRestored, $reason );
 412         }
 413
 414         /**
 415          * This is the meaty bit -- restores archived revisions of the given page
 416          * to the cur/old tables. If the page currently exists, all revisions will
 417          * be stuffed into old, otherwise the most recent will go into cur.
 418          *
 419          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 420          * @param $comment String
 421          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 422          *
 423          * @return Mixed: number of revisions restored or false on failure
 424          */
 425         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 426                 global $wgContentHandlerNoDB;
 427
 428                 if ( wfReadOnly() ) {
 429                         return false;
 430                 }
 431                 $restoreAll = empty( $timestamps );
 432
 433                 $dbw = wfGetDB( DB_MASTER );
 434
 435                 # Does this page already exist? We'll have to update it...
 436                 $article = WikiPage::factory( $this->title );
 437                 # Load latest data for the current page (bug 31179)
 438                 $article->loadPageData( 'fromdbmaster' );
 439                 $oldcountable = $article->isCountable();
 440
 441                 $page = $dbw->selectRow( 'page',
 442                         array( 'page_id', 'page_latest' ),
 443                         array( 'page_namespace' => $this->title->getNamespace(),
 444                                    'page_title'     => $this->title->getDBkey() ),
 445                         __METHOD__,
 446                         array( 'FOR UPDATE' ) // lock page
 447                 );
 448                 if( $page ) {
 449                         $makepage = false;
 450                         # Page already exists. Import the history, and if necessary
 451                         # we'll update the latest revision field in the record.
 452                         $newid             = 0;
 453                         $pageId            = $page->page_id;
 454                         $previousRevId    = $page->page_latest;
 455                         # Get the time span of this page
 456                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 457                                 array( 'rev_id' => $previousRevId ),
 458                                 __METHOD__ );
 459                         if( $previousTimestamp === false ) {
 460                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 461                                 return 0;
 462                         }
 463                 } else {
 464                         # Have to create a new article...
 465                         $makepage = true;
 466                         $previousRevId = 0;
 467                         $previousTimestamp = 0;
 468                 }
 469
 470                 if( $restoreAll ) {
 471                         $oldones = '1 = 1'; # All revisions...
 472                 } else {
 473                         $oldts = implode( ',',
 474                                 array_map( array( &$dbw, 'addQuotes' ),
 475                                         array_map( array( &$dbw, 'timestamp' ),
 476                                                 $timestamps ) ) );
 477
 478                         $oldones = "ar_timestamp IN ( {$oldts} )";
 479                 }
 480
 481                 $fields = array(
 482                         'ar_rev_id',
 483                         'ar_text',
 484                         'ar_comment',
 485                         'ar_user',
 486                         'ar_user_text',
 487                         'ar_timestamp',
 488                         'ar_minor_edit',
 489                         'ar_flags',
 490                         'ar_text_id',
 491                         'ar_deleted',
 492                         'ar_page_id',
 493                         'ar_len',
 494                         'ar_sha1');
 495
 496                 if ( !$wgContentHandlerNoDB ) {
 497                         $fields[] = 'ar_content_format';
 498                         $fields[] = 'ar_content_model';
 499                 }
 500
 501                 /**
 502                  * Select each archived revision...
 503                  */
 504                 $result = $dbw->select( 'archive',
 505                         $fields,
 506                         /* WHERE */ array(
 507                                 'ar_namespace' => $this->title->getNamespace(),
 508                                 'ar_title'     => $this->title->getDBkey(),
 509                                 $oldones ),
 510                         __METHOD__,
 511                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 512                 );
 513                 $ret = $dbw->resultObject( $result );
 514                 $rev_count = $dbw->numRows( $result );
 515                 if( !$rev_count ) {
 516                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 517                         return false; // ???
 518                 }
 519
 520                 $ret->seek( $rev_count - 1 ); // move to last
 521                 $row = $ret->fetchObject(); // get newest archived rev
 522                 $ret->seek( 0 ); // move back
 523
 524                 if( $makepage ) {
 525                         // Check the state of the newest to-be version...
 526                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 527                                 return false; // we can't leave the current revision like this!
 528                         }
 529                         // Safe to insert now...
 530                         $newid  = $article->insertOn( $dbw );
 531                         $pageId = $newid;
 532                 } else {
 533                         // Check if a deleted revision will become the current revision...
 534                         if( $row->ar_timestamp > $previousTimestamp ) {
 535                                 // Check the state of the newest to-be version...
 536                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 537                                         return false; // we can't leave the current revision like this!
 538                                 }
 539                         }
 540                 }
 541
 542                 $revision = null;
 543                 $restored = 0;
 544
 545                 foreach ( $ret as $row ) {
 546                         // Check for key dupes due to shitty archive integrity.
 547                         if( $row->ar_rev_id ) {
 548                                 $exists = $dbw->selectField( 'revision', '1',
 549                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 550                                 if( $exists ) {
 551                                         continue; // don't throw DB errors
 552                                 }
 553                         }
 554                         // Insert one revision at a time...maintaining deletion status
 555                         // unless we are specifically removing all restrictions...
 556                         $revision = Revision::newFromArchiveRow( $row,
 557                                 array(
 558                                         'page' => $pageId,
 559                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 560                                 ) );
 561
 562                         $revision->insertOn( $dbw );
 563                         $restored++;
 564
 565                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 566                 }
 567                 # Now that it's safely stored, take it out of the archive
 568                 $dbw->delete( 'archive',
 569                         /* WHERE */ array(
 570                                 'ar_namespace' => $this->title->getNamespace(),
 571                                 'ar_title' => $this->title->getDBkey(),
 572                                 $oldones ),
 573                         __METHOD__ );
 574
 575                 // Was anything restored at all?
 576                 if ( $restored == 0 ) {
 577                         return 0;
 578                 }
 579
 580                 $created = (bool)$newid;
 581
 582                 // Attach the latest revision to the page...
 583                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 584                 if ( $created || $wasnew ) {
 585                         // Update site stats, link tables, etc
 586                         $user = User::newFromName( $revision->getRawUserText(), false );
 587                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 588                 }
 589
 590                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 591
 592                 if( $this->title->getNamespace() == NS_FILE ) {
 593                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 594                         $update->doUpdate();
 595                 }
 596
 597                 return $restored;
 598         }
 599
 600         /**
 601          * @return Status
 602          */
 603         function getFileStatus() { return $this->fileStatus; }
 604 }
 605
 606 /**
 607  * Special page allowing users with the appropriate permissions to view
 608  * and restore deleted content.
 609  *
 610  * @ingroup SpecialPage
 611  */
 612 class SpecialUndelete extends SpecialPage {
 613         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 614         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 615
 616         /**
 617          * @var Title
 618          */
 619         var $mTargetObj;
 620
 621         function __construct() {
 622                 parent::__construct( 'Undelete', 'deletedhistory' );
 623         }
 624
 625         function loadRequest( $par ) {
 626                 $request = $this->getRequest();
 627                 $user = $this->getUser();
 628
 629                 $this->mAction = $request->getVal( 'action' );
 630                 if ( $par !== null && $par !== '' ) {
 631                         $this->mTarget = $par;
 632                 } else {
 633                         $this->mTarget = $request->getVal( 'target' );
 634                 }
 635                 $this->mTargetObj = null;
 636                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 637                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 638                 }
 639                 $this->mSearchPrefix = $request->getText( 'prefix' );
 640                 $time = $request->getVal( 'timestamp' );
 641                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 642                 $this->mFilename = $request->getVal( 'file' );
 643
 644                 $posted = $request->wasPosted() &&
 645                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 646                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 647                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 648                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 649                 $this->mDiff = $request->getCheck( 'diff' );
 650                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 651                 $this->mComment = $request->getText( 'wpComment' );
 652                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 653                 $this->mToken = $request->getVal( 'token' );
 654
 655                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 656                         $this->mAllowed = true; // user can restore
 657                         $this->mCanView = true; // user can view content
 658                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 659                         $this->mAllowed = false; // user cannot restore
 660                         $this->mCanView = true; // user can view content
 661                         $this->mRestore = false;
 662                 } else { // user can only view the list of revisions
 663                         $this->mAllowed = false;
 664                         $this->mCanView = false;
 665                         $this->mTimestamp = '';
 666                         $this->mRestore = false;
 667                 }
 668
 669                 if( $this->mRestore || $this->mInvert ) {
 670                         $timestamps = array();
 671                         $this->mFileVersions = array();
 672                         foreach( $request->getValues() as $key => $val ) {
 673                                 $matches = array();
 674                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 675                                         array_push( $timestamps, $matches[1] );
 676                                 }
 677
 678                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 679                                         $this->mFileVersions[] = intval( $matches[1] );
 680                                 }
 681                         }
 682                         rsort( $timestamps );
 683                         $this->mTargetTimestamp = $timestamps;
 684                 }
 685         }
 686
 687         function execute( $par ) {
 688                 $this->checkPermissions();
 689                 $user = $this->getUser();
 690
 691                 $this->setHeaders();
 692                 $this->outputHeader();
 693
 694                 $this->loadRequest( $par );
 695
 696                 $out = $this->getOutput();
 697
 698                 if ( is_null( $this->mTargetObj ) ) {
 699                         $out->addWikiMsg( 'undelete-header' );
 700
 701                         # Not all users can just browse every deleted page from the list
 702                         if ( $user->isAllowed( 'browsearchive' ) ) {
 703                                 $this->showSearchForm();
 704                         }
 705                         return;
 706                 }
 707
 708                 if ( $this->mAllowed ) {
 709                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 710                 } else {
 711                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 712                 }
 713
 714                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 715
 716                 if ( $this->mTimestamp !== '' ) {
 717                         $this->showRevision( $this->mTimestamp );
 718                 } elseif ( $this->mFilename !== null ) {
 719                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 720                         // Check if user is allowed to see this file
 721                         if ( !$file->exists() ) {
 722                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 723                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 724                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 725                                         throw new PermissionsError( 'suppressrevision' );
 726                                 } else {
 727                                         throw new PermissionsError( 'deletedtext' );
 728                                 }
 729                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 730                                 $this->showFileConfirmationForm( $this->mFilename );
 731                         } else {
 732                                 $this->showFile( $this->mFilename );
 733                         }
 734                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 735                         $this->undelete();
 736                 } else {
 737                         $this->showHistory();
 738                 }
 739         }
 740
 741         function showSearchForm() {
 742                 global $wgScript;
 743
 744                 $out = $this->getOutput();
 745                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 746                 $out->addHTML(
 747                         Xml::openElement( 'form', array(
 748                                 'method' => 'get',
 749                                 'action' => $wgScript ) ) .
 750                         Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 751                         Html::hidden( 'title',
 752                                 $this->getTitle()->getPrefixedDbKey() ) .
 753                         Xml::inputLabel( $this->msg( 'undelete-search-prefix' )->text(),
 754                                 'prefix', 'prefix', 20,
 755                                 $this->mSearchPrefix ) . ' ' .
 756                         Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 757                         Xml::closeElement( 'fieldset' ) .
 758                         Xml::closeElement( 'form' )
 759                 );
 760
 761                 # List undeletable articles
 762                 if( $this->mSearchPrefix ) {
 763                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 764                         $this->showList( $result );
 765                 }
 766         }
 767
 768         /**
 769          * Generic list of deleted pages
 770          *
 771          * @param $result ResultWrapper
 772          * @return bool
 773          */
 774         private function showList( $result ) {
 775                 $out = $this->getOutput();
 776
 777                 if( $result->numRows() == 0 ) {
 778                         $out->addWikiMsg( 'undelete-no-results' );
 779                         return;
 780                 }
 781
 782                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 783
 784                 $undelete = $this->getTitle();
 785                 $out->addHTML( "<ul>\n" );
 786                 foreach ( $result as $row ) {
 787                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 788                         if ( $title !== null ) {
 789                                 $item = Linker::linkKnown(
 790                                         $undelete,
 791                                         htmlspecialchars( $title->getPrefixedText() ),
 792                                         array(),
 793                                         array( 'target' => $title->getPrefixedText() )
 794                                 );
 795                         } else {
 796                                 // The title is no longer valid, show as text
 797                                 $item = Html::element( 'span', array( 'class' => 'mw-invalidtitle' ),
 798                                         Linker::getInvalidTitleDescription( $this->getContext(), $row->ar_namespace, $row->ar_title ) );
 799                         }
 800                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 801                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 802                 }
 803                 $result->free();
 804                 $out->addHTML( "</ul>\n" );
 805
 806                 return true;
 807         }
 808
 809         private function showRevision( $timestamp ) {
 810                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 811                         return 0;
 812                 }
 813
 814                 $archive = new PageArchive( $this->mTargetObj );
 815                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 816                 $rev = $archive->getRevision( $timestamp );
 817
 818                 $out = $this->getOutput();
 819                 $user = $this->getUser();
 820
 821                 if( !$rev ) {
 822                         $out->addWikiMsg( 'undeleterevision-missing' );
 823                         return;
 824                 }
 825
 826                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 827                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 828                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 829                                 return;
 830                         } else {
 831                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 832                                 $out->addHTML( '<br />' );
 833                                 // and we are allowed to see...
 834                         }
 835                 }
 836
 837                 if( $this->mDiff ) {
 838                         $previousRev = $archive->getPreviousRevision( $timestamp );
 839                         if( $previousRev ) {
 840                                 $this->showDiff( $previousRev, $rev );
 841                                 if( $this->mDiffOnly ) {
 842                                         return;
 843                                 } else {
 844                                         $out->addHTML( '<hr />' );
 845                                 }
 846                         } else {
 847                                 $out->addWikiMsg( 'undelete-nodiff' );
 848                         }
 849                 }
 850
 851                 $link = Linker::linkKnown(
 852                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 853                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 854                 );
 855
 856                 $lang = $this->getLanguage();
 857
 858                 // date and time are separate parameters to facilitate localisation.
 859                 // $time is kept for backward compat reasons.
 860                 $time = $lang->userTimeAndDate( $timestamp, $user );
 861                 $d = $lang->userDate( $timestamp, $user );
 862                 $t = $lang->userTime( $timestamp, $user );
 863                 $userLink = Linker::revUserTools( $rev );
 864
 865                 if( $this->mPreview ) {
 866                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 867                 } else {
 868                         $openDiv = '<div id="mw-undelete-revision">';
 869                 }
 870                 $out->addHTML( $openDiv );
 871
 872                 // Revision delete links
 873                 if ( !$this->mDiff ) {
 874                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 875                         if ( $revdel ) {
 876                                 $out->addHTML( "$revdel " );
 877                         }
 878                 }
 879
 880                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 881                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 882                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 883
 884                 if( $this->mPreview ) {
 885                         // Hide [edit]s
 886                         //FIXME: ContentHandler will have to provide some specialized magic to do this
 887                         $popts = $out->parserOptions();
 888                         $popts->setEditSection( false );
 889                         $out->parserOptions( $popts );
 890                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER, $user ), $this->mTargetObj, true );
 891                 }
 892
 893                 $out->addHTML(
 894                         Xml::element( 'textarea', array(
 895                                         'readonly' => 'readonly',
 896                                         'cols' => intval( $user->getOption( 'cols' ) ),
 897                                         'rows' => intval( $user->getOption( 'rows' ) ) ),
 898                                 $rev->getText( Revision::FOR_THIS_USER, $user ) . "\n" ) . //FIXME: ContentHandler will have to provide some specialized magic to do this
 899                         Xml::openElement( 'div' ) .
 900                         Xml::openElement( 'form', array(
 901                                 'method' => 'post',
 902                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 903                         Xml::element( 'input', array(
 904                                 'type' => 'hidden',
 905                                 'name' => 'target',
 906                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 907                         Xml::element( 'input', array(
 908                                 'type' => 'hidden',
 909                                 'name' => 'timestamp',
 910                                 'value' => $timestamp ) ) .
 911                         Xml::element( 'input', array(
 912                                 'type' => 'hidden',
 913                                 'name' => 'wpEditToken',
 914                                 'value' => $user->getEditToken() ) ) .
 915                         Xml::element( 'input', array(
 916                                 'type' => 'submit',
 917                                 'name' => 'preview',
 918                                 'value' => $this->msg( 'showpreview' )->text() ) ) .
 919                         Xml::element( 'input', array(
 920                                 'name' => 'diff',
 921                                 'type' => 'submit',
 922                                 'value' => $this->msg( 'showdiff' )->text() ) ) .
 923                         Xml::closeElement( 'form' ) .
 924                         Xml::closeElement( 'div' ) );
 925         }
 926
 927         /**
 928          * Build a diff display between this and the previous either deleted
 929          * or non-deleted edit.
 930          *
 931          * @param $previousRev Revision
 932          * @param $currentRev Revision
 933          * @return String: HTML
 934          */
 935         function showDiff( $previousRev, $currentRev ) {
 936                 $contentHandler = ContentHandler::getForTitle( $this->getTitle() );
 937                 $diffEngine = $contentHandler->createDifferenceEngine( $this->getContext() );
 938                 $diffEngine->showDiffStyle();
 939                 $this->getOutput()->addHTML(
 940                         "<div>" .
 941                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 942                         "<col class='diff-marker' />" .
 943                         "<col class='diff-content' />" .
 944                         "<col class='diff-marker' />" .
 945                         "<col class='diff-content' />" .
 946                         "<tr>" .
 947                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 948                                 $this->diffHeader( $previousRev, 'o' ) .
 949                                 "</td>\n" .
 950                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 951                                 $this->diffHeader( $currentRev, 'n' ) .
 952                                 "</td>\n" .
 953                         "</tr>" .
 954                         $diffEngine->generateContentDiffBody(
 955                                 $previousRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ),
 956                                 $currentRev->getContent( Revision::FOR_THIS_USER, $this->getUser() ) ) .
 957                         "</table>" .
 958                         "</div>\n"
 959                 );
 960         }
 961
 962         /**
 963          * @param $rev Revision
 964          * @param $prefix
 965          * @return string
 966          */
 967         private function diffHeader( $rev, $prefix ) {
 968                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 969                 if( $isDeleted ) {
 970                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 971                         $targetPage = $this->getTitle();
 972                         $targetQuery = array(
 973                                 'target' => $this->mTargetObj->getPrefixedText(),
 974                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 975                         );
 976                 } else {
 977                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 978                         $targetPage = $rev->getTitle();
 979                         $targetQuery = array( 'oldid' => $rev->getId() );
 980                 }
 981                 // Add show/hide deletion links if available
 982                 $user = $this->getUser();
 983                 $lang = $this->getLanguage();
 984                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 985                 if ( $rdel ) $rdel = " $rdel";
 986                 return
 987                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 988                                 Linker::link(
 989                                         $targetPage,
 990                                         $this->msg(
 991                                                 'revisionasof',
 992                                                 $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
 993                                                 $lang->userDate( $rev->getTimestamp(), $user ),
 994                                                 $lang->userTime( $rev->getTimestamp(), $user )
 995                                         )->escaped(),
 996                                         array(),
 997                                         $targetQuery
 998                                 ) .
 999                         '</strong></div>' .
1000                         '<div id="mw-diff-'.$prefix.'title2">' .
1001                                 Linker::revUserTools( $rev ) . '<br />' .
1002                         '</div>' .
1003                         '<div id="mw-diff-'.$prefix.'title3">' .
1004                                 Linker::revComment( $rev ) . $rdel . '<br />' .
1005                         '</div>';
1006         }
1007
1008         /**
1009          * Show a form confirming whether a tokenless user really wants to see a file
1010          */
1011         private function showFileConfirmationForm( $key ) {
1012                 $out = $this->getOutput();
1013                 $lang = $this->getLanguage();
1014                 $user = $this->getUser();
1015                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1016                 $out->addWikiMsg( 'undelete-show-file-confirm',
1017                         $this->mTargetObj->getText(),
1018                         $lang->userDate( $file->getTimestamp(), $user ),
1019                         $lang->userTime( $file->getTimestamp(), $user ) );
1020                 $out->addHTML(
1021                         Xml::openElement( 'form', array(
1022                                 'method' => 'POST',
1023                                 'action' => $this->getTitle()->getLocalURL(
1024                                         'target=' . urlencode( $this->mTarget ) .
1025                                         '&file=' . urlencode( $key ) .
1026                                         '&token=' . urlencode( $user->getEditToken( $key ) ) )
1027                                 )
1028                         ) .
1029                         Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
1030                         '</form>'
1031                 );
1032         }
1033
1034         /**
1035          * Show a deleted file version requested by the visitor.
1036          */
1037         private function showFile( $key ) {
1038                 $this->getOutput()->disable();
1039
1040                 # We mustn't allow the output to be Squid cached, otherwise
1041                 # if an admin previews a deleted image, and it's cached, then
1042                 # a user without appropriate permissions can toddle off and
1043                 # nab the image, and Squid will serve it
1044                 $response = $this->getRequest()->response();
1045                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1046                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1047                 $response->header( 'Pragma: no-cache' );
1048
1049                 $repo = RepoGroup::singleton()->getLocalRepo();
1050                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1051                 $repo->streamFile( $path );
1052         }
1053
1054         private function showHistory() {
1055                 $out = $this->getOutput();
1056                 if( $this->mAllowed ) {
1057                         $out->addModules( 'mediawiki.special.undelete' );
1058                 }
1059                 $out->wrapWikiMsg(
1060                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1061                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1062                 );
1063
1064                 $archive = new PageArchive( $this->mTargetObj );
1065                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1066                 /*
1067                 $text = $archive->getLastRevisionText();
1068                 if( is_null( $text ) ) {
1069                         $out->addWikiMsg( 'nohistory' );
1070                         return;
1071                 }
1072                 */
1073                 $out->addHTML( '<div class="mw-undelete-history">' );
1074                 if ( $this->mAllowed ) {
1075                         $out->addWikiMsg( 'undeletehistory' );
1076                         $out->addWikiMsg( 'undeleterevdel' );
1077                 } else {
1078                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1079                 }
1080                 $out->addHTML( '</div>' );
1081
1082                 # List all stored revisions
1083                 $revisions = $archive->listRevisions();
1084                 $files = $archive->listFiles();
1085
1086                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1087                 $haveFiles = $files && $files->numRows() > 0;
1088
1089                 # Batch existence check on user and talk pages
1090                 if( $haveRevisions ) {
1091                         $batch = new LinkBatch();
1092                         foreach ( $revisions as $row ) {
1093                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1094                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1095                         }
1096                         $batch->execute();
1097                         $revisions->seek( 0 );
1098                 }
1099                 if( $haveFiles ) {
1100                         $batch = new LinkBatch();
1101                         foreach ( $files as $row ) {
1102                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1103                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1104                         }
1105                         $batch->execute();
1106                         $files->seek( 0 );
1107                 }
1108
1109                 if ( $this->mAllowed ) {
1110                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1111                         # Start the form here
1112                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1113                         $out->addHTML( $top );
1114                 }
1115
1116                 # Show relevant lines from the deletion log:
1117                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1118                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1119                 # Show relevant lines from the suppression log:
1120                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1121                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1122                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1123                 }
1124
1125                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1126                         # Format the user-visible controls (comment field, submission button)
1127                         # in a nice little table
1128                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1129                                 $unsuppressBox =
1130                                         "<tr>
1131                                                 <td>&#160;</td>
1132                                                 <td class='mw-input'>" .
1133                                                         Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1134                                                                 'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ).
1135                                                 "</td>
1136                                         </tr>";
1137                         } else {
1138                                 $unsuppressBox = '';
1139                         }
1140                         $table =
1141                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1142                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1143                                         "<tr>
1144                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1145                                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1146                                                 "</td>
1147                                         </tr>
1148                                         <tr>
1149                                                 <td class='mw-label'>" .
1150                                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1151                                                 "</td>
1152                                                 <td class='mw-input'>" .
1153                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1154                                                 "</td>
1155                                         </tr>
1156                                         <tr>
1157                                                 <td>&#160;</td>
1158                                                 <td class='mw-submit'>" .
1159                                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1160                                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1161                                                 "</td>
1162                                         </tr>" .
1163                                         $unsuppressBox .
1164                                 Xml::closeElement( 'table' ) .
1165                                 Xml::closeElement( 'fieldset' );
1166
1167                         $out->addHTML( $table );
1168                 }
1169
1170                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1171
1172                 if( $haveRevisions ) {
1173                         # The page's stored (deleted) history:
1174                         $out->addHTML( '<ul>' );
1175                         $remaining = $revisions->numRows();
1176                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1177
1178                         foreach ( $revisions as $row ) {
1179                                 $remaining--;
1180                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1181                         }
1182                         $revisions->free();
1183                         $out->addHTML( '</ul>' );
1184                 } else {
1185                         $out->addWikiMsg( 'nohistory' );
1186                 }
1187
1188                 if( $haveFiles ) {
1189                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1190                         $out->addHTML( '<ul>' );
1191                         foreach ( $files as $row ) {
1192                                 $out->addHTML( $this->formatFileRow( $row ) );
1193                         }
1194                         $files->free();
1195                         $out->addHTML( '</ul>' );
1196                 }
1197
1198                 if ( $this->mAllowed ) {
1199                         # Slip in the hidden controls here
1200                         $misc  = Html::hidden( 'target', $this->mTarget );
1201                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1202                         $misc .= Xml::closeElement( 'form' );
1203                         $out->addHTML( $misc );
1204                 }
1205
1206                 return true;
1207         }
1208
1209         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1210                 $rev = Revision::newFromArchiveRow( $row,
1211                         array( 'page' => $this->mTargetObj->getArticleID() ) );
1212                 $revTextSize = '';
1213                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1214                 // Build checkboxen...
1215                 if( $this->mAllowed ) {
1216                         if( $this->mInvert ) {
1217                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1218                                         $checkBox = Xml::check( "ts$ts" );
1219                                 } else {
1220                                         $checkBox = Xml::check( "ts$ts", true );
1221                                 }
1222                         } else {
1223                                 $checkBox = Xml::check( "ts$ts" );
1224                         }
1225                 } else {
1226                         $checkBox = '';
1227                 }
1228                 $user = $this->getUser();
1229                 // Build page & diff links...
1230                 if( $this->mCanView ) {
1231                         $titleObj = $this->getTitle();
1232                         # Last link
1233                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1234                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1235                                 $last = $this->msg( 'diff' )->escaped();
1236                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1237                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1238                                 $last = Linker::linkKnown(
1239                                         $titleObj,
1240                                         $this->msg( 'diff' )->escaped(),
1241                                         array(),
1242                                         array(
1243                                                 'target' => $this->mTargetObj->getPrefixedText(),
1244                                                 'timestamp' => $ts,
1245                                                 'diff' => 'prev'
1246                                         )
1247                                 );
1248                         } else {
1249                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1250                                 $last = $this->msg( 'diff' )->escaped();
1251                         }
1252                 } else {
1253                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1254                         $last = $this->msg( 'diff' )->escaped();
1255                 }
1256                 // User links
1257                 $userLink = Linker::revUserTools( $rev );
1258                 // Revision text size
1259                 $size = $row->ar_len;
1260                 if( !is_null( $size ) ) {
1261                         $revTextSize = Linker::formatRevisionSize( $size );
1262                 }
1263                 // Edit summary
1264                 $comment = Linker::revComment( $rev );
1265                 // Revision delete links
1266                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1267
1268                 $revisionRow = $this->msg( 'undelete-revisionrow' )->rawParams( $checkBox, $revdlink, $last, $pageLink , $userLink, $revTextSize, $comment )->escaped();
1269                 return "<li>$revisionRow</li>";
1270         }
1271
1272         private function formatFileRow( $row ) {
1273                 $file = ArchivedFile::newFromRow( $row );
1274
1275                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1276                 $user = $this->getUser();
1277                 if( $this->mAllowed && $row->fa_storage_key ) {
1278                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1279                         $key = urlencode( $row->fa_storage_key );
1280                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1281                 } else {
1282                         $checkBox = '';
1283                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1284                 }
1285                 $userLink = $this->getFileUser( $file );
1286                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1287                 $bytes = $this->msg( 'parentheses' )->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )->plain();
1288                 $data = htmlspecialchars( $data . ' ' . $bytes );
1289                 $comment = $this->getFileComment( $file );
1290
1291                 // Add show/hide deletion links if available
1292                 $canHide = $user->isAllowed( 'deleterevision' );
1293                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1294                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1295                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1296                         } else {
1297                                 $query = array(
1298                                         'type' => 'filearchive',
1299                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1300                                         'ids' => $row->fa_id
1301                                 );
1302                                 $revdlink = Linker::revDeleteLink( $query,
1303                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1304                         }
1305                 } else {
1306                         $revdlink = '';
1307                 }
1308
1309                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1310         }
1311
1312         /**
1313          * Fetch revision text link if it's available to all users
1314          *
1315          * @param $rev Revision
1316          * @param $titleObj Title
1317          * @param $ts string Timestamp
1318          * @return string
1319          */
1320         function getPageLink( $rev, $titleObj, $ts ) {
1321                 $user = $this->getUser();
1322                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1323
1324                 if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1325                         return '<span class="history-deleted">' . $time . '</span>';
1326                 } else {
1327                         $link = Linker::linkKnown(
1328                                 $titleObj,
1329                                 htmlspecialchars( $time ),
1330                                 array(),
1331                                 array(
1332                                         'target' => $this->mTargetObj->getPrefixedText(),
1333                                         'timestamp' => $ts
1334                                 )
1335                         );
1336                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1337                                 $link = '<span class="history-deleted">' . $link . '</span>';
1338                         }
1339                         return $link;
1340                 }
1341         }
1342
1343         /**
1344          * Fetch image view link if it's available to all users
1345          *
1346          * @param $file File
1347          * @param $titleObj Title
1348          * @param $ts string A timestamp
1349          * @param $key String: a storage key
1350          *
1351          * @return String: HTML fragment
1352          */
1353         function getFileLink( $file, $titleObj, $ts, $key ) {
1354                 $user = $this->getUser();
1355                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1356
1357                 if( !$file->userCan( File::DELETED_FILE, $user ) ) {
1358                         return '<span class="history-deleted">' . $time . '</span>';
1359                 } else {
1360                         $link = Linker::linkKnown(
1361                                 $titleObj,
1362                                 htmlspecialchars( $time ),
1363                                 array(),
1364                                 array(
1365                                         'target' => $this->mTargetObj->getPrefixedText(),
1366                                         'file' => $key,
1367                                         'token' => $user->getEditToken( $key )
1368                                 )
1369                         );
1370                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1371                                 $link = '<span class="history-deleted">' . $link . '</span>';
1372                         }
1373                         return $link;
1374                 }
1375         }
1376
1377         /**
1378          * Fetch file's user id if it's available to this user
1379          *
1380          * @param $file File
1381          * @return String: HTML fragment
1382          */
1383         function getFileUser( $file ) {
1384                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1385                         return '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1386                 } else {
1387                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1388                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1389                         if( $file->isDeleted( File::DELETED_USER ) ) {
1390                                 $link = '<span class="history-deleted">' . $link . '</span>';
1391                         }
1392                         return $link;
1393                 }
1394         }
1395
1396         /**
1397          * Fetch file upload comment if it's available to this user
1398          *
1399          * @param $file File
1400          * @return String: HTML fragment
1401          */
1402         function getFileComment( $file ) {
1403                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1404                         return '<span class="history-deleted"><span class="comment">' .
1405                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1406                 } else {
1407                         $link = Linker::commentBlock( $file->getRawDescription() );
1408                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1409                                 $link = '<span class="history-deleted">' . $link . '</span>';
1410                         }
1411                         return $link;
1412                 }
1413         }
1414
1415         function undelete() {
1416                 global $wgUploadMaintenance;
1417
1418                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1419                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1420                 }
1421
1422                 if ( wfReadOnly() ) {
1423                         throw new ReadOnlyError;
1424                 }
1425
1426                 $out = $this->getOutput();
1427                 $archive = new PageArchive( $this->mTargetObj );
1428                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1429                 $ok = $archive->undelete(
1430                         $this->mTargetTimestamp,
1431                         $this->mComment,
1432                         $this->mFileVersions,
1433                         $this->mUnsuppress,
1434                         $this->getUser()
1435                 );
1436
1437                 if( is_array( $ok ) ) {
1438                         if ( $ok[1] ) { // Undeleted file count
1439                                 wfRunHooks( 'FileUndeleteComplete', array(
1440                                         $this->mTargetObj, $this->mFileVersions,
1441                                         $this->getUser(), $this->mComment ) );
1442                         }
1443
1444                         $link = Linker::linkKnown( $this->mTargetObj );
1445                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1446                 } else {
1447                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1448                         $out->addWikiMsg( 'cannotundelete' );
1449                         $out->addWikiMsg( 'undeleterevdel' );
1450                 }
1451
1452                 // Show file deletion warnings and errors
1453                 $status = $archive->getFileStatus();
1454                 if( $status && !$status->isGood() ) {
1455                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1456                 }
1457         }
1458 }