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                 global $wgUser;
  66                 $dbr = wfGetDB( DB_SLAVE );
  67
  68                 $title = Title::newFromText( $prefix );
  69                 if( $title ) {
  70                         $ns = $title->getNamespace();
  71                         $prefix = $title->getDBkey();
  72                 } else {
  73                         // Prolly won't work too good
  74                         // @todo handle bare namespace names cleanly?
  75                         $ns = 0;
  76                 }
  77                 $conds = array(
  78                         'ar_namespace' => $ns,
  79                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  80                 );
  81
  82                 // bug 19725
  83                 $suppressedText = Revision::DELETED_TEXT | Revision::DELETED_RESTRICTED;
  84                 if( !$wgUser->isAllowed( 'suppressrevision' ) ) {
  85                         $conds[] = $dbr->bitAnd('ar_deleted', $suppressedText ) .
  86                                 ' != ' . $suppressedText;
  87                 }
  88                 return self::listPages( $dbr, $conds );
  89         }
  90
  91         /**
  92          * @param $dbr DatabaseBase
  93          * @param $condition
  94          * @return bool|ResultWrapper
  95          */
  96         protected static function listPages( $dbr, $condition ) {
  97                 return $dbr->resultObject(
  98                         $dbr->select(
  99                                 array( 'archive' ),
 100                                 array(
 101                                         'ar_namespace',
 102                                         'ar_title',
 103                                         'COUNT(*) AS count'
 104                                 ),
 105                                 $condition,
 106                                 __METHOD__,
 107                                 array(
 108                                         'GROUP BY' => 'ar_namespace,ar_title',
 109                                         'ORDER BY' => 'ar_namespace,ar_title',
 110                                         'LIMIT' => 100,
 111                                 )
 112                         )
 113                 );
 114         }
 115
 116         /**
 117          * List the revisions of the given page. Returns result wrapper with
 118          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 119          *
 120          * @return ResultWrapper
 121          */
 122         function listRevisions() {
 123                 $dbr = wfGetDB( DB_SLAVE );
 124                 $res = $dbr->select( 'archive',
 125                         array(
 126                                 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 127                                 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1'
 128                         ),
 129                         array( 'ar_namespace' => $this->title->getNamespace(),
 130                                    'ar_title' => $this->title->getDBkey() ),
 131                         'PageArchive::listRevisions',
 132                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 133                 $ret = $dbr->resultObject( $res );
 134                 return $ret;
 135         }
 136
 137         /**
 138          * List the deleted file revisions for this page, if it's a file page.
 139          * Returns a result wrapper with various filearchive fields, or null
 140          * if not a file page.
 141          *
 142          * @return ResultWrapper
 143          * @todo Does this belong in Image for fuller encapsulation?
 144          */
 145         function listFiles() {
 146                 if( $this->title->getNamespace() == NS_FILE ) {
 147                         $dbr = wfGetDB( DB_SLAVE );
 148                         $res = $dbr->select( 'filearchive',
 149                                 array(
 150                                         'fa_id',
 151                                         'fa_name',
 152                                         'fa_archive_name',
 153                                         'fa_storage_key',
 154                                         'fa_storage_group',
 155                                         'fa_size',
 156                                         'fa_width',
 157                                         'fa_height',
 158                                         'fa_bits',
 159                                         'fa_metadata',
 160                                         'fa_media_type',
 161                                         'fa_major_mime',
 162                                         'fa_minor_mime',
 163                                         'fa_description',
 164                                         'fa_user',
 165                                         'fa_user_text',
 166                                         'fa_timestamp',
 167                                         'fa_deleted' ),
 168                                 array( 'fa_name' => $this->title->getDBkey() ),
 169                                 __METHOD__,
 170                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 171                         $ret = $dbr->resultObject( $res );
 172                         return $ret;
 173                 }
 174                 return null;
 175         }
 176
 177         /**
 178          * Return a Revision object containing data for the deleted revision.
 179          * Note that the result *may* or *may not* have a null page ID.
 180          *
 181          * @param $timestamp String
 182          * @return Revision
 183          */
 184         function getRevision( $timestamp ) {
 185                 $dbr = wfGetDB( DB_SLAVE );
 186                 $row = $dbr->selectRow( 'archive',
 187                         array(
 188                                 'ar_rev_id',
 189                                 'ar_text',
 190                                 'ar_comment',
 191                                 'ar_user',
 192                                 'ar_user_text',
 193                                 'ar_timestamp',
 194                                 'ar_minor_edit',
 195                                 'ar_flags',
 196                                 'ar_text_id',
 197                                 'ar_deleted',
 198                                 'ar_len' ),
 199                         array( 'ar_namespace' => $this->title->getNamespace(),
 200                                    'ar_title' => $this->title->getDBkey(),
 201                                    'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 202                         __METHOD__ );
 203                 if( $row ) {
 204                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 205                 } else {
 206                         return null;
 207                 }
 208         }
 209
 210         /**
 211          * Return the most-previous revision, either live or deleted, against
 212          * the deleted revision given by timestamp.
 213          *
 214          * May produce unexpected results in case of history merges or other
 215          * unusual time issues.
 216          *
 217          * @param $timestamp String
 218          * @return Revision or null
 219          */
 220         function getPreviousRevision( $timestamp ) {
 221                 $dbr = wfGetDB( DB_SLAVE );
 222
 223                 // Check the previous deleted revision...
 224                 $row = $dbr->selectRow( 'archive',
 225                         'ar_timestamp',
 226                         array( 'ar_namespace' => $this->title->getNamespace(),
 227                                    'ar_title' => $this->title->getDBkey(),
 228                                    'ar_timestamp < ' .
 229                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 230                         __METHOD__,
 231                         array(
 232                                 'ORDER BY' => 'ar_timestamp DESC',
 233                                 'LIMIT' => 1 ) );
 234                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 235
 236                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 237                         array( 'rev_id', 'rev_timestamp' ),
 238                         array(
 239                                 'page_namespace' => $this->title->getNamespace(),
 240                                 'page_title' => $this->title->getDBkey(),
 241                                 'page_id = rev_page',
 242                                 'rev_timestamp < ' .
 243                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 244                         __METHOD__,
 245                         array(
 246                                 'ORDER BY' => 'rev_timestamp DESC',
 247                                 'LIMIT' => 1 ) );
 248                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 249                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 250
 251                 if( $prevLive && $prevLive > $prevDeleted ) {
 252                         // Most prior revision was live
 253                         return Revision::newFromId( $prevLiveId );
 254                 } elseif( $prevDeleted ) {
 255                         // Most prior revision was deleted
 256                         return $this->getRevision( $prevDeleted );
 257                 } else {
 258                         // No prior revision on this page.
 259                         return null;
 260                 }
 261         }
 262
 263         /**
 264          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 265          *
 266          * @param $row Object: database row
 267          * @return Revision
 268          */
 269         function getTextFromRow( $row ) {
 270                 if( is_null( $row->ar_text_id ) ) {
 271                         // An old row from MediaWiki 1.4 or previous.
 272                         // Text is embedded in this row in classic compression format.
 273                         return Revision::getRevisionText( $row, 'ar_' );
 274                 } else {
 275                         // New-style: keyed to the text storage backend.
 276                         $dbr = wfGetDB( DB_SLAVE );
 277                         $text = $dbr->selectRow( 'text',
 278                                 array( 'old_text', 'old_flags' ),
 279                                 array( 'old_id' => $row->ar_text_id ),
 280                                 __METHOD__ );
 281                         return Revision::getRevisionText( $text );
 282                 }
 283         }
 284
 285         /**
 286          * Fetch (and decompress if necessary) the stored text of the most
 287          * recently edited deleted revision of the page.
 288          *
 289          * If there are no archived revisions for the page, returns NULL.
 290          *
 291          * @return String
 292          */
 293         function getLastRevisionText() {
 294                 $dbr = wfGetDB( DB_SLAVE );
 295                 $row = $dbr->selectRow( 'archive',
 296                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 297                         array( 'ar_namespace' => $this->title->getNamespace(),
 298                                    'ar_title' => $this->title->getDBkey() ),
 299                         __METHOD__,
 300                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 301                 if( $row ) {
 302                         return $this->getTextFromRow( $row );
 303                 } else {
 304                         return null;
 305                 }
 306         }
 307
 308         /**
 309          * Quick check if any archived revisions are present for the page.
 310          *
 311          * @return Boolean
 312          */
 313         function isDeleted() {
 314                 $dbr = wfGetDB( DB_SLAVE );
 315                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 316                         array( 'ar_namespace' => $this->title->getNamespace(),
 317                                    'ar_title' => $this->title->getDBkey() ) );
 318                 return ( $n > 0 );
 319         }
 320
 321         /**
 322          * Restore the given (or all) text and file revisions for the page.
 323          * Once restored, the items will be removed from the archive tables.
 324          * The deletion log will be updated with an undeletion notice.
 325          *
 326          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 327          * @param $comment String
 328          * @param $fileVersions Array
 329          * @param $unsuppress Boolean
 330          *
 331          * @return array(number of file revisions restored, number of image revisions restored, log message)
 332          * on success, false on failure
 333          */
 334         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 335                 // If both the set of text revisions and file revisions are empty,
 336                 // restore everything. Otherwise, just restore the requested items.
 337                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 338
 339                 $restoreText = $restoreAll || !empty( $timestamps );
 340                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 341
 342                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 343                         $img = wfLocalFile( $this->title );
 344                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 345                         if ( !$this->fileStatus->isOk() ) {
 346                                 return false;
 347                         }
 348                         $filesRestored = $this->fileStatus->successCount;
 349                 } else {
 350                         $filesRestored = 0;
 351                 }
 352
 353                 if( $restoreText ) {
 354                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 355                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 356                                 return false;
 357                         }
 358                 } else {
 359                         $textRestored = 0;
 360                 }
 361
 362                 // Touch the log!
 363                 global $wgContLang;
 364                 $log = new LogPage( 'delete' );
 365
 366                 if( $textRestored && $filesRestored ) {
 367                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 368                                 $wgContLang->formatNum( $textRestored ),
 369                                 $wgContLang->formatNum( $filesRestored ) );
 370                 } elseif( $textRestored ) {
 371                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 372                                 $wgContLang->formatNum( $textRestored ) );
 373                 } elseif( $filesRestored ) {
 374                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 375                                 $wgContLang->formatNum( $filesRestored ) );
 376                 } else {
 377                         wfDebug( "Undelete: nothing undeleted...\n" );
 378                         return false;
 379                 }
 380
 381                 if( trim( $comment ) != '' ) {
 382                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 383                 }
 384                 $log->addEntry( 'restore', $this->title, $reason );
 385
 386                 return array( $textRestored, $filesRestored, $reason );
 387         }
 388
 389         /**
 390          * This is the meaty bit -- restores archived revisions of the given page
 391          * to the cur/old tables. If the page currently exists, all revisions will
 392          * be stuffed into old, otherwise the most recent will go into cur.
 393          *
 394          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 395          * @param $comment String
 396          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 397          *
 398          * @return Mixed: number of revisions restored or false on failure
 399          */
 400         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 401                 if ( wfReadOnly() ) {
 402                         return false;
 403                 }
 404                 $restoreAll = empty( $timestamps );
 405
 406                 $dbw = wfGetDB( DB_MASTER );
 407
 408                 # Does this page already exist? We'll have to update it...
 409                 $article = new Article( $this->title );
 410                 $options = 'FOR UPDATE'; // lock page
 411                 $page = $dbw->selectRow( 'page',
 412                         array( 'page_id', 'page_latest' ),
 413                         array( 'page_namespace' => $this->title->getNamespace(),
 414                                    'page_title'     => $this->title->getDBkey() ),
 415                         __METHOD__,
 416                         $options
 417                 );
 418                 if( $page ) {
 419                         $makepage = false;
 420                         # Page already exists. Import the history, and if necessary
 421                         # we'll update the latest revision field in the record.
 422                         $newid             = 0;
 423                         $pageId            = $page->page_id;
 424                         $previousRevId    = $page->page_latest;
 425                         # Get the time span of this page
 426                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 427                                 array( 'rev_id' => $previousRevId ),
 428                                 __METHOD__ );
 429                         if( $previousTimestamp === false ) {
 430                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 431                                 return 0;
 432                         }
 433                 } else {
 434                         # Have to create a new article...
 435                         $makepage = true;
 436                         $previousRevId = 0;
 437                         $previousTimestamp = 0;
 438                 }
 439
 440                 if( $restoreAll ) {
 441                         $oldones = '1 = 1'; # All revisions...
 442                 } else {
 443                         $oldts = implode( ',',
 444                                 array_map( array( &$dbw, 'addQuotes' ),
 445                                         array_map( array( &$dbw, 'timestamp' ),
 446                                                 $timestamps ) ) );
 447
 448                         $oldones = "ar_timestamp IN ( {$oldts} )";
 449                 }
 450
 451                 /**
 452                  * Select each archived revision...
 453                  */
 454                 $result = $dbw->select( 'archive',
 455                         /* fields */ array(
 456                                 'ar_rev_id',
 457                                 'ar_text',
 458                                 'ar_comment',
 459                                 'ar_user',
 460                                 'ar_user_text',
 461                                 'ar_timestamp',
 462                                 'ar_minor_edit',
 463                                 'ar_flags',
 464                                 'ar_text_id',
 465                                 'ar_deleted',
 466                                 'ar_page_id',
 467                                 'ar_len',
 468                                 'ar_sha1' ),
 469                         /* WHERE */ array(
 470                                 'ar_namespace' => $this->title->getNamespace(),
 471                                 'ar_title'     => $this->title->getDBkey(),
 472                                 $oldones ),
 473                         __METHOD__,
 474                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 475                 );
 476                 $ret = $dbw->resultObject( $result );
 477                 $rev_count = $dbw->numRows( $result );
 478                 if( !$rev_count ) {
 479                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 480                         return false; // ???
 481                 }
 482
 483                 $ret->seek( $rev_count - 1 ); // move to last
 484                 $row = $ret->fetchObject(); // get newest archived rev
 485                 $ret->seek( 0 ); // move back
 486
 487                 if( $makepage ) {
 488                         // Check the state of the newest to-be version...
 489                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 490                                 return false; // we can't leave the current revision like this!
 491                         }
 492                         // Safe to insert now...
 493                         $newid  = $article->insertOn( $dbw );
 494                         $pageId = $newid;
 495                 } else {
 496                         // Check if a deleted revision will become the current revision...
 497                         if( $row->ar_timestamp > $previousTimestamp ) {
 498                                 // Check the state of the newest to-be version...
 499                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 500                                         return false; // we can't leave the current revision like this!
 501                                 }
 502                         }
 503                 }
 504
 505                 $revision = null;
 506                 $restored = 0;
 507
 508                 foreach ( $ret as $row ) {
 509                         // Check for key dupes due to shitty archive integrity.
 510                         if( $row->ar_rev_id ) {
 511                                 $exists = $dbw->selectField( 'revision', '1',
 512                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 513                                 if( $exists ) {
 514                                         continue; // don't throw DB errors
 515                                 }
 516                         }
 517                         // Insert one revision at a time...maintaining deletion status
 518                         // unless we are specifically removing all restrictions...
 519                         $revision = Revision::newFromArchiveRow( $row,
 520                                 array(
 521                                         'page' => $pageId,
 522                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 523                                 ) );
 524
 525                         $revision->insertOn( $dbw );
 526                         $restored++;
 527
 528                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 529                 }
 530                 # Now that it's safely stored, take it out of the archive
 531                 $dbw->delete( 'archive',
 532                         /* WHERE */ array(
 533                                 'ar_namespace' => $this->title->getNamespace(),
 534                                 'ar_title' => $this->title->getDBkey(),
 535                                 $oldones ),
 536                         __METHOD__ );
 537
 538                 // Was anything restored at all?
 539                 if ( $restored == 0 ) {
 540                         return 0;
 541                 }
 542
 543                 $created = (bool)$newid;
 544                 $oldcountable = $article->isCountable();
 545
 546                 // Attach the latest revision to the page...
 547                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 548                 if ( $created || $wasnew ) {
 549                         // Update site stats, link tables, etc
 550                         $user = User::newFromName( $revision->getRawUserText(), false );
 551                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 552                 }
 553
 554                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 555
 556                 if( $this->title->getNamespace() == NS_FILE ) {
 557                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 558                         $update->doUpdate();
 559                 }
 560
 561                 return $restored;
 562         }
 563
 564         /**
 565          * @return Status
 566          */
 567         function getFileStatus() { return $this->fileStatus; }
 568 }
 569
 570 /**
 571  * Special page allowing users with the appropriate permissions to view
 572  * and restore deleted content.
 573  *
 574  * @ingroup SpecialPage
 575  */
 576 class SpecialUndelete extends SpecialPage {
 577         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 578         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 579
 580         /**
 581          * @var Title
 582          */
 583         var $mTargetObj;
 584
 585         function __construct() {
 586                 parent::__construct( 'Undelete', 'deletedhistory' );
 587         }
 588
 589         function loadRequest() {
 590                 $request = $this->getRequest();
 591                 $user = $this->getUser();
 592
 593                 $this->mAction = $request->getVal( 'action' );
 594                 $this->mTarget = $request->getVal( 'target' );
 595                 $this->mSearchPrefix = $request->getText( 'prefix' );
 596                 $time = $request->getVal( 'timestamp' );
 597                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 598                 $this->mFilename = $request->getVal( 'file' );
 599
 600                 $posted = $request->wasPosted() &&
 601                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 602                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 603                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 604                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 605                 $this->mDiff = $request->getCheck( 'diff' );
 606                 $this->mComment = $request->getText( 'wpComment' );
 607                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 608                 $this->mToken = $request->getVal( 'token' );
 609
 610                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 611                         $this->mAllowed = true; // user can restore
 612                         $this->mCanView = true; // user can view content
 613                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 614                         $this->mAllowed = false; // user cannot restore
 615                         $this->mCanView = true; // user can view content
 616                 } else { // user can only view the list of revisions
 617                         $this->mAllowed = false;
 618                         $this->mCanView = false;
 619                         $this->mTimestamp = '';
 620                         $this->mRestore = false;
 621                 }
 622
 623                 if( $this->mRestore || $this->mInvert ) {
 624                         $timestamps = array();
 625                         $this->mFileVersions = array();
 626                         foreach( $request->getValues() as $key => $val ) {
 627                                 $matches = array();
 628                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 629                                         array_push( $timestamps, $matches[1] );
 630                                 }
 631
 632                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 633                                         $this->mFileVersions[] = intval( $matches[1] );
 634                                 }
 635                         }
 636                         rsort( $timestamps );
 637                         $this->mTargetTimestamp = $timestamps;
 638                 }
 639         }
 640
 641         function execute( $par ) {
 642                 $this->setHeaders();
 643                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 644                         $this->displayRestrictionError();
 645                         return;
 646                 }
 647
 648                 if ( $this->getUser()->isBlocked() ) {
 649                         throw new UserBlockedError( $this->getUser()->getBlock() );
 650                 }
 651
 652                 $this->outputHeader();
 653
 654                 $this->loadRequest();
 655
 656                 $out = $this->getOutput();
 657
 658                 if ( $this->mAllowed ) {
 659                         $out->setPageTitle( wfMsg( 'undeletepage' ) );
 660                 } else {
 661                         $out->setPageTitle( wfMsg( 'viewdeletedpage' ) );
 662                 }
 663
 664                 if( $par != '' ) {
 665                         $this->mTarget = $par;
 666                 }
 667                 if ( $this->mTarget !== '' ) {
 668                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 669                         $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 670                 } else {
 671                         $this->mTargetObj = null;
 672                 }
 673
 674                 if( is_null( $this->mTargetObj ) ) {
 675                         # Not all users can just browse every deleted page from the list
 676                         if( $this->getUser()->isAllowed( 'browsearchive' ) ) {
 677                                 $this->showSearchForm();
 678
 679                                 # List undeletable articles
 680                                 if( $this->mSearchPrefix ) {
 681                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 682                                         $this->showList( $result );
 683                                 }
 684                         } else {
 685                                 $out->addWikiMsg( 'undelete-header' );
 686                         }
 687                         return;
 688                 }
 689                 if( $this->mTimestamp !== '' ) {
 690                         return $this->showRevision( $this->mTimestamp );
 691                 }
 692                 if( $this->mFilename !== null ) {
 693                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 694                         // Check if user is allowed to see this file
 695                         if ( !$file->exists() ) {
 696                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 697                                 return;
 698                         } elseif( !$file->userCan( File::DELETED_FILE ) ) {
 699                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 700                                         $out->permissionRequired( 'suppressrevision' );
 701                                 } else {
 702                                         $out->permissionRequired( 'deletedtext' );
 703                                 }
 704                                 return false;
 705                         } elseif ( !$this->getUser()->matchEditToken( $this->mToken, $this->mFilename ) ) {
 706                                 $this->showFileConfirmationForm( $this->mFilename );
 707                                 return false;
 708                         } else {
 709                                 return $this->showFile( $this->mFilename );
 710                         }
 711                 }
 712                 if( $this->mRestore && $this->mAction == 'submit' ) {
 713                         global $wgUploadMaintenance;
 714                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 715                                 $out->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 716                                 return;
 717                         }
 718                         return $this->undelete();
 719                 }
 720                 if( $this->mInvert && $this->mAction == 'submit' ) {
 721                         return $this->showHistory();
 722                 }
 723                 return $this->showHistory();
 724         }
 725
 726         function showSearchForm() {
 727                 global $wgScript;
 728
 729                 $this->getOutput()->addWikiMsg( 'undelete-header' );
 730
 731                 $this->getOutput()->addHTML(
 732                         Xml::openElement( 'form', array(
 733                                 'method' => 'get',
 734                                 'action' => $wgScript ) ) .
 735                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 736                         Html::hidden( 'title',
 737                                 $this->getTitle()->getPrefixedDbKey() ) .
 738                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 739                                 'prefix', 'prefix', 20,
 740                                 $this->mSearchPrefix ) . ' ' .
 741                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 742                         Xml::closeElement( 'fieldset' ) .
 743                         Xml::closeElement( 'form' )
 744                 );
 745         }
 746
 747         /**
 748          * Generic list of deleted pages
 749          *
 750          * @param $result ResultWrapper
 751          * @return bool
 752          */
 753         private function showList( $result ) {
 754                 $out = $this->getOutput();
 755
 756                 if( $result->numRows() == 0 ) {
 757                         $out->addWikiMsg( 'undelete-no-results' );
 758                         return;
 759                 }
 760
 761                 $out->addWikiMsg( 'undeletepagetext', $this->getLang()->formatNum( $result->numRows() ) );
 762
 763                 $undelete = $this->getTitle();
 764                 $out->addHTML( "<ul>\n" );
 765                 foreach ( $result as $row ) {
 766                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 767                         $link = Linker::linkKnown(
 768                                 $undelete,
 769                                 htmlspecialchars( $title->getPrefixedText() ),
 770                                 array(),
 771                                 array( 'target' => $title->getPrefixedText() )
 772                         );
 773                         $revs = wfMsgExt( 'undeleterevisions',
 774                                 array( 'parseinline' ),
 775                                 $this->getLang()->formatNum( $row->count ) );
 776                         $out->addHTML( "<li>{$link} ({$revs})</li>\n" );
 777                 }
 778                 $result->free();
 779                 $out->addHTML( "</ul>\n" );
 780
 781                 return true;
 782         }
 783
 784         private function showRevision( $timestamp ) {
 785                 $out = $this->getOutput();
 786
 787                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 788                         return 0;
 789                 }
 790
 791                 $archive = new PageArchive( $this->mTargetObj );
 792                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 793                 $rev = $archive->getRevision( $timestamp );
 794
 795                 if( !$rev ) {
 796                         $out->addWikiMsg( 'undeleterevision-missing' );
 797                         return;
 798                 }
 799
 800                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 801                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 802                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 803                                 return;
 804                         } else {
 805                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 806                                 $out->addHTML( '<br />' );
 807                                 // and we are allowed to see...
 808                         }
 809                 }
 810
 811                 $out->setPageTitle( wfMsg( 'undeletepage' ) );
 812
 813                 if( $this->mDiff ) {
 814                         $previousRev = $archive->getPreviousRevision( $timestamp );
 815                         if( $previousRev ) {
 816                                 $this->showDiff( $previousRev, $rev );
 817                                 if( $this->getUser()->getOption( 'diffonly' ) ) {
 818                                         return;
 819                                 } else {
 820                                         $out->addHTML( '<hr />' );
 821                                 }
 822                         } else {
 823                                 $out->addWikiMsg( 'undelete-nodiff' );
 824                         }
 825                 }
 826
 827                 $link = Linker::linkKnown(
 828                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 829                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 830                 );
 831
 832                 // date and time are separate parameters to facilitate localisation.
 833                 // $time is kept for backward compat reasons.
 834                 $time = $this->getLang()->timeAndDate( $timestamp, true );
 835                 $d = $this->getLang()->date( $timestamp, true );
 836                 $t = $this->getLang()->time( $timestamp, true );
 837                 $user = Linker::revUserTools( $rev );
 838
 839                 if( $this->mPreview ) {
 840                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 841                 } else {
 842                         $openDiv = '<div id="mw-undelete-revision">';
 843                 }
 844                 $out->addHTML( $openDiv );
 845
 846                 // Revision delete links
 847                 if ( !$this->mDiff ) {
 848                         $revdel = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
 849                         if ( $revdel ) {
 850                                 $out->addHTML( "$revdel " );
 851                         }
 852                 }
 853
 854                 $out->addHTML( wfMessage( 'undelete-revision' )->rawParams( $link )->params(
 855                         $time )->rawParams( $user )->params( $d, $t )->parse() . '</div>' );
 856                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 857
 858                 if( $this->mPreview ) {
 859                         // Hide [edit]s
 860                         $popts = $out->parserOptions();
 861                         $popts->setEditSection( false );
 862                         $out->parserOptions( $popts );
 863                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 864                 }
 865
 866                 $out->addHTML(
 867                         Xml::element( 'textarea', array(
 868                                         'readonly' => 'readonly',
 869                                         'cols' => intval( $this->getUser()->getOption( 'cols' ) ),
 870                                         'rows' => intval( $this->getUser()->getOption( 'rows' ) ) ),
 871                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 872                         Xml::openElement( 'div' ) .
 873                         Xml::openElement( 'form', array(
 874                                 'method' => 'post',
 875                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 876                         Xml::element( 'input', array(
 877                                 'type' => 'hidden',
 878                                 'name' => 'target',
 879                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 880                         Xml::element( 'input', array(
 881                                 'type' => 'hidden',
 882                                 'name' => 'timestamp',
 883                                 'value' => $timestamp ) ) .
 884                         Xml::element( 'input', array(
 885                                 'type' => 'hidden',
 886                                 'name' => 'wpEditToken',
 887                                 'value' => $this->getUser()->editToken() ) ) .
 888                         Xml::element( 'input', array(
 889                                 'type' => 'submit',
 890                                 'name' => 'preview',
 891                                 'value' => wfMsg( 'showpreview' ) ) ) .
 892                         Xml::element( 'input', array(
 893                                 'name' => 'diff',
 894                                 'type' => 'submit',
 895                                 'value' => wfMsg( 'showdiff' ) ) ) .
 896                         Xml::closeElement( 'form' ) .
 897                         Xml::closeElement( 'div' ) );
 898         }
 899
 900         /**
 901          * Build a diff display between this and the previous either deleted
 902          * or non-deleted edit.
 903          *
 904          * @param $previousRev Revision
 905          * @param $currentRev Revision
 906          * @return String: HTML
 907          */
 908         function showDiff( $previousRev, $currentRev ) {
 909                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 910                 $diffEngine->showDiffStyle();
 911                 $this->getOutput()->addHTML(
 912                         "<div>" .
 913                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 914                         "<col class='diff-marker' />" .
 915                         "<col class='diff-content' />" .
 916                         "<col class='diff-marker' />" .
 917                         "<col class='diff-content' />" .
 918                         "<tr>" .
 919                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 920                                 $this->diffHeader( $previousRev, 'o' ) .
 921                                 "</td>\n" .
 922                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 923                                 $this->diffHeader( $currentRev, 'n' ) .
 924                                 "</td>\n" .
 925                         "</tr>" .
 926                         $diffEngine->generateDiffBody(
 927                                 $previousRev->getText(), $currentRev->getText() ) .
 928                         "</table>" .
 929                         "</div>\n"
 930                 );
 931         }
 932
 933         /**
 934          * @param $rev Revision
 935          * @param $prefix
 936          * @return string
 937          */
 938         private function diffHeader( $rev, $prefix ) {
 939                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 940                 if( $isDeleted ) {
 941                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 942                         $targetPage = $this->getTitle();
 943                         $targetQuery = array(
 944                                 'target' => $this->mTargetObj->getPrefixedText(),
 945                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 946                         );
 947                 } else {
 948                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 949                         $targetPage = $rev->getTitle();
 950                         $targetQuery = array( 'oldid' => $rev->getId() );
 951                 }
 952                 // Add show/hide deletion links if available
 953                 $rdel = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
 954                 if ( $rdel ) $rdel = " $rdel";
 955                 return
 956                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 957                                 Linker::link(
 958                                         $targetPage,
 959                                         wfMsgExt(
 960                                                 'revisionasof',
 961                                                 array( 'escape' ),
 962                                                 $this->getLang()->timeanddate( $rev->getTimestamp(), true ),
 963                                                 $this->getLang()->date( $rev->getTimestamp(), true ),
 964                                                 $this->getLang()->time( $rev->getTimestamp(), true )
 965                                         ),
 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                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 983                 $this->getOutput()->addWikiMsg( 'undelete-show-file-confirm',
 984                         $this->mTargetObj->getText(),
 985                         $this->getLang()->date( $file->getTimestamp() ),
 986                         $this->getLang()->time( $file->getTimestamp() ) );
 987                 $this->getOutput()->addHTML(
 988                         Xml::openElement( 'form', array(
 989                                 'method' => 'POST',
 990                                 'action' => $this->getTitle()->getLocalURL(
 991                                         'target=' . urlencode( $this->mTarget ) .
 992                                         '&file=' . urlencode( $key ) .
 993                                         '&token=' . urlencode( $this->getUser()->editToken( $key ) ) )
 994                                 )
 995                         ) .
 996                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
 997                         '</form>'
 998                 );
 999         }
1000
1001         /**
1002          * Show a deleted file version requested by the visitor.
1003          */
1004         private function showFile( $key ) {
1005                 $this->getOutput()->disable();
1006
1007                 # We mustn't allow the output to be Squid cached, otherwise
1008                 # if an admin previews a deleted image, and it's cached, then
1009                 # a user without appropriate permissions can toddle off and
1010                 # nab the image, and Squid will serve it
1011                 $response = $this->getRequest()->response();
1012                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1013                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1014                 $response->header( 'Pragma: no-cache' );
1015
1016                 $repo = RepoGroup::singleton()->getLocalRepo();
1017                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1018                 StreamFile::stream( $path );
1019         }
1020
1021         private function showHistory() {
1022                 $out = $this->getOutput();
1023                 if( $this->mAllowed ) {
1024                         $out->addModules( 'mediawiki.special.undelete' );
1025                         $out->setPageTitle( wfMsg( 'undeletepage' ) );
1026                 } else {
1027                         $out->setPageTitle( wfMsg( 'viewdeletedpage' ) );
1028                 }
1029                 $out->wrapWikiMsg(
1030                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1031                         array( 'undeletepagetitle', $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                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1088                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj->getPrefixedText() );
1089                 # Show relevant lines from the suppression log:
1090                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1091                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1092                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj->getPrefixedText() );
1093                 }
1094
1095                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1096                         # Format the user-visible controls (comment field, submission button)
1097                         # in a nice little table
1098                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1099                                 $unsuppressBox =
1100                                         "<tr>
1101                                                 <td>&#160;</td>
1102                                                 <td class='mw-input'>" .
1103                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1104                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1105                                                 "</td>
1106                                         </tr>";
1107                         } else {
1108                                 $unsuppressBox = '';
1109                         }
1110                         $table =
1111                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1112                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1113                                         "<tr>
1114                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1115                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1116                                                 "</td>
1117                                         </tr>
1118                                         <tr>
1119                                                 <td class='mw-label'>" .
1120                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1121                                                 "</td>
1122                                                 <td class='mw-input'>" .
1123                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1124                                                 "</td>
1125                                         </tr>
1126                                         <tr>
1127                                                 <td>&#160;</td>
1128                                                 <td class='mw-submit'>" .
1129                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1130                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1131                                                 "</td>
1132                                         </tr>" .
1133                                         $unsuppressBox .
1134                                 Xml::closeElement( 'table' ) .
1135                                 Xml::closeElement( 'fieldset' );
1136
1137                         $out->addHTML( $table );
1138                 }
1139
1140                 $out->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1141
1142                 if( $haveRevisions ) {
1143                         # The page's stored (deleted) history:
1144                         $out->addHTML( '<ul>' );
1145                         $remaining = $revisions->numRows();
1146                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1147
1148                         foreach ( $revisions as $row ) {
1149                                 $remaining--;
1150                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1151                         }
1152                         $revisions->free();
1153                         $out->addHTML( '</ul>' );
1154                 } else {
1155                         $out->addWikiMsg( 'nohistory' );
1156                 }
1157
1158                 if( $haveFiles ) {
1159                         $out->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1160                         $out->addHTML( '<ul>' );
1161                         foreach ( $files as $row ) {
1162                                 $out->addHTML( $this->formatFileRow( $row ) );
1163                         }
1164                         $files->free();
1165                         $out->addHTML( '</ul>' );
1166                 }
1167
1168                 if ( $this->mAllowed ) {
1169                         # Slip in the hidden controls here
1170                         $misc  = Html::hidden( 'target', $this->mTarget );
1171                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->editToken() );
1172                         $misc .= Xml::closeElement( 'form' );
1173                         $out->addHTML( $misc );
1174                 }
1175
1176                 return true;
1177         }
1178
1179         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1180                 $rev = Revision::newFromArchiveRow( $row,
1181                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1182                 $stxt = '';
1183                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1184                 // Build checkboxen...
1185                 if( $this->mAllowed ) {
1186                         if( $this->mInvert ) {
1187                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1188                                         $checkBox = Xml::check( "ts$ts" );
1189                                 } else {
1190                                         $checkBox = Xml::check( "ts$ts", true );
1191                                 }
1192                         } else {
1193                                 $checkBox = Xml::check( "ts$ts" );
1194                         }
1195                 } else {
1196                         $checkBox = '';
1197                 }
1198                 // Build page & diff links...
1199                 if( $this->mCanView ) {
1200                         $titleObj = $this->getTitle();
1201                         # Last link
1202                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1203                                 $pageLink = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1204                                 $last = wfMsgHtml( 'diff' );
1205                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1206                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1207                                 $last = Linker::linkKnown(
1208                                         $titleObj,
1209                                         wfMsgHtml( 'diff' ),
1210                                         array(),
1211                                         array(
1212                                                 'target' => $this->mTargetObj->getPrefixedText(),
1213                                                 'timestamp' => $ts,
1214                                                 'diff' => 'prev'
1215                                         )
1216                                 );
1217                         } else {
1218                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1219                                 $last = wfMsgHtml( 'diff' );
1220                         }
1221                 } else {
1222                         $pageLink = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1223                         $last = wfMsgHtml( 'diff' );
1224                 }
1225                 // User links
1226                 $userLink = Linker::revUserTools( $rev );
1227                 // Revision text size
1228                 $size = $row->ar_len;
1229                 if( !is_null( $size ) ) {
1230                         $stxt = Linker::formatRevisionSize( $size );
1231                 }
1232                 // Edit summary
1233                 $comment = Linker::revComment( $rev );
1234                 // Revision delete links
1235                 $revdlink = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
1236                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1237         }
1238
1239         private function formatFileRow( $row ) {
1240                 $file = ArchivedFile::newFromRow( $row );
1241
1242                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1243                 if( $this->mAllowed && $row->fa_storage_key ) {
1244                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1245                         $key = urlencode( $row->fa_storage_key );
1246                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1247                 } else {
1248                         $checkBox = '';
1249                         $pageLink = $this->getLang()->timeanddate( $ts, true );
1250                 }
1251                 $userLink = $this->getFileUser( $file );
1252                 $data =
1253                         wfMsg( 'widthheight',
1254                                 $this->getLang()->formatNum( $row->fa_width ),
1255                                 $this->getLang()->formatNum( $row->fa_height ) ) .
1256                         ' (' .
1257                         wfMsg( 'nbytes', $this->getLang()->formatNum( $row->fa_size ) ) .
1258                         ')';
1259                 $data = htmlspecialchars( $data );
1260                 $comment = $this->getFileComment( $file );
1261
1262                 // Add show/hide deletion links if available
1263                 $canHide = $this->getUser()->isAllowed( 'deleterevision' );
1264                 if( $canHide || ( $file->getVisibility() && $this->getUser()->isAllowed( 'deletedhistory' ) ) ) {
1265                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1266                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1267                         } else {
1268                                 $query = array(
1269                                         'type' => 'filearchive',
1270                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1271                                         'ids' => $row->fa_id
1272                                 );
1273                                 $revdlink = Linker::revDeleteLink( $query,
1274                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1275                         }
1276                 } else {
1277                         $revdlink = '';
1278                 }
1279
1280                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1281         }
1282
1283         /**
1284          * Fetch revision text link if it's available to all users
1285          *
1286          * @param $rev Revision
1287          * @return string
1288          */
1289         function getPageLink( $rev, $titleObj, $ts ) {
1290                 $time = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1291
1292                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1293                         return '<span class="history-deleted">' . $time . '</span>';
1294                 } else {
1295                         $link = Linker::linkKnown(
1296                                 $titleObj,
1297                                 $time,
1298                                 array(),
1299                                 array(
1300                                         'target' => $this->mTargetObj->getPrefixedText(),
1301                                         'timestamp' => $ts
1302                                 )
1303                         );
1304                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1305                                 $link = '<span class="history-deleted">' . $link . '</span>';
1306                         }
1307                         return $link;
1308                 }
1309         }
1310
1311         /**
1312          * Fetch image view link if it's available to all users
1313          *
1314          * @param $file File
1315          * @return String: HTML fragment
1316          */
1317         function getFileLink( $file, $titleObj, $ts, $key ) {
1318                 if( !$file->userCan( File::DELETED_FILE ) ) {
1319                         return '<span class="history-deleted">' . $this->getLang()->timeanddate( $ts, true ) . '</span>';
1320                 } else {
1321                         $link = Linker::linkKnown(
1322                                 $titleObj,
1323                                 $this->getLang()->timeanddate( $ts, true ),
1324                                 array(),
1325                                 array(
1326                                         'target' => $this->mTargetObj->getPrefixedText(),
1327                                         'file' => $key,
1328                                         'token' => $this->getUser()->editToken( $key )
1329                                 )
1330                         );
1331                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1332                                 $link = '<span class="history-deleted">' . $link . '</span>';
1333                         }
1334                         return $link;
1335                 }
1336         }
1337
1338         /**
1339          * Fetch file's user id if it's available to this user
1340          *
1341          * @param $file File
1342          * @return String: HTML fragment
1343          */
1344         function getFileUser( $file ) {
1345                 if( !$file->userCan( File::DELETED_USER ) ) {
1346                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1347                 } else {
1348                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1349                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1350                         if( $file->isDeleted( File::DELETED_USER ) ) {
1351                                 $link = '<span class="history-deleted">' . $link . '</span>';
1352                         }
1353                         return $link;
1354                 }
1355         }
1356
1357         /**
1358          * Fetch file upload comment if it's available to this user
1359          *
1360          * @param $file File
1361          * @return String: HTML fragment
1362          */
1363         function getFileComment( $file ) {
1364                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1365                         return '<span class="history-deleted"><span class="comment">' .
1366                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1367                 } else {
1368                         $link = Linker::commentBlock( $file->getRawDescription() );
1369                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1370                                 $link = '<span class="history-deleted">' . $link . '</span>';
1371                         }
1372                         return $link;
1373                 }
1374         }
1375
1376         function undelete() {
1377                 if ( wfReadOnly() ) {
1378                         throw new ReadOnlyError;
1379                 }
1380
1381                 if( !is_null( $this->mTargetObj ) ) {
1382                         $archive = new PageArchive( $this->mTargetObj );
1383                         wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1384                         $ok = $archive->undelete(
1385                                 $this->mTargetTimestamp,
1386                                 $this->mComment,
1387                                 $this->mFileVersions,
1388                                 $this->mUnsuppress );
1389
1390                         if( is_array( $ok ) ) {
1391                                 if ( $ok[1] ) { // Undeleted file count
1392                                         wfRunHooks( 'FileUndeleteComplete', array(
1393                                                 $this->mTargetObj, $this->mFileVersions,
1394                                                 $this->getUser(), $this->mComment ) );
1395                                 }
1396
1397                                 $link = Linker::linkKnown( $this->mTargetObj );
1398                                 $this->getOutput()->addHTML( wfMessage( 'undeletedpage' )->rawParams( $link )->parse() );
1399                         } else {
1400                                 $this->getOutput()->showFatalError( wfMsg( 'cannotundelete' ) );
1401                                 $this->getOutput()->addWikiMsg( 'undeleterevdel' );
1402                         }
1403
1404                         // Show file deletion warnings and errors
1405                         $status = $archive->getFileStatus();
1406                         if( $status && !$status->isGood() ) {
1407                                 $this->getOutput()->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1408                         }
1409                 } else {
1410                         $this->getOutput()->showFatalError( wfMsg( 'cannotundelete' ) );
1411                 }
1412                 return false;
1413         }
1414 }