includes/specials/SpecialUndelete.php

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