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