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                 $options = 'FOR UPDATE'; // lock page
 403                 $page = $dbw->selectRow( 'page',
 404                         array( 'page_id', 'page_latest' ),
 405                         array( 'page_namespace' => $this->title->getNamespace(),
 406                                    'page_title'     => $this->title->getDBkey() ),
 407                         __METHOD__,
 408                         $options
 409                 );
 410                 if( $page ) {
 411                         $makepage = false;
 412                         # Page already exists. Import the history, and if necessary
 413                         # we'll update the latest revision field in the record.
 414                         $newid             = 0;
 415                         $pageId            = $page->page_id;
 416                         $previousRevId    = $page->page_latest;
 417                         # Get the time span of this page
 418                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 419                                 array( 'rev_id' => $previousRevId ),
 420                                 __METHOD__ );
 421                         if( $previousTimestamp === false ) {
 422                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 423                                 return 0;
 424                         }
 425                 } else {
 426                         # Have to create a new article...
 427                         $makepage = true;
 428                         $previousRevId = 0;
 429                         $previousTimestamp = 0;
 430                 }
 431
 432                 if( $restoreAll ) {
 433                         $oldones = '1 = 1'; # All revisions...
 434                 } else {
 435                         $oldts = implode( ',',
 436                                 array_map( array( &$dbw, 'addQuotes' ),
 437                                         array_map( array( &$dbw, 'timestamp' ),
 438                                                 $timestamps ) ) );
 439
 440                         $oldones = "ar_timestamp IN ( {$oldts} )";
 441                 }
 442
 443                 /**
 444                  * Select each archived revision...
 445                  */
 446                 $result = $dbw->select( 'archive',
 447                         /* fields */ array(
 448                                 'ar_rev_id',
 449                                 'ar_text',
 450                                 'ar_comment',
 451                                 'ar_user',
 452                                 'ar_user_text',
 453                                 'ar_timestamp',
 454                                 'ar_minor_edit',
 455                                 'ar_flags',
 456                                 'ar_text_id',
 457                                 'ar_deleted',
 458                                 'ar_page_id',
 459                                 'ar_len' ),
 460                         /* WHERE */ array(
 461                                 'ar_namespace' => $this->title->getNamespace(),
 462                                 'ar_title'     => $this->title->getDBkey(),
 463                                 $oldones ),
 464                         __METHOD__,
 465                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 466                 );
 467                 $ret = $dbw->resultObject( $result );
 468                 $rev_count = $dbw->numRows( $result );
 469                 if( !$rev_count ) {
 470                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 471                         return false; // ???
 472                 }
 473
 474                 $ret->seek( $rev_count - 1 ); // move to last
 475                 $row = $ret->fetchObject(); // get newest archived rev
 476                 $ret->seek( 0 ); // move back
 477
 478                 if( $makepage ) {
 479                         // Check the state of the newest to-be version...
 480                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 481                                 return false; // we can't leave the current revision like this!
 482                         }
 483                         // Safe to insert now...
 484                         $newid  = $article->insertOn( $dbw );
 485                         $pageId = $newid;
 486                 } else {
 487                         // Check if a deleted revision will become the current revision...
 488                         if( $row->ar_timestamp > $previousTimestamp ) {
 489                                 // Check the state of the newest to-be version...
 490                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 491                                         return false; // we can't leave the current revision like this!
 492                                 }
 493                         }
 494                 }
 495
 496                 $revision = null;
 497                 $restored = 0;
 498
 499                 foreach ( $ret as $row ) {
 500                         // Check for key dupes due to shitty archive integrity.
 501                         if( $row->ar_rev_id ) {
 502                                 $exists = $dbw->selectField( 'revision', '1',
 503                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 504                                 if( $exists ) {
 505                                         continue; // don't throw DB errors
 506                                 }
 507                         }
 508                         // Insert one revision at a time...maintaining deletion status
 509                         // unless we are specifically removing all restrictions...
 510                         $revision = Revision::newFromArchiveRow( $row,
 511                                 array(
 512                                         'page' => $pageId,
 513                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 514                                 ) );
 515
 516                         $revision->insertOn( $dbw );
 517                         $restored++;
 518
 519                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 520                 }
 521                 # Now that it's safely stored, take it out of the archive
 522                 $dbw->delete( 'archive',
 523                         /* WHERE */ array(
 524                                 'ar_namespace' => $this->title->getNamespace(),
 525                                 'ar_title' => $this->title->getDBkey(),
 526                                 $oldones ),
 527                         __METHOD__ );
 528
 529                 // Was anything restored at all?
 530                 if ( $restored == 0 ) {
 531                         return 0;
 532                 }
 533
 534                 $created = (bool)$newid;
 535
 536                 // Attach the latest revision to the page...
 537                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 538                 if ( $created || $wasnew ) {
 539                         // Update site stats, link tables, etc
 540                         $article->editUpdates( $revision->getText(), $revision->getComment(),
 541                                 $revision->isMinor(), wfTimestamp(), $revision->getId(), true, null, $created );
 542                 }
 543
 544                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 545
 546                 if( $created ) {
 547                         Article::onArticleCreate( $this->title );
 548                 } else {
 549                         Article::onArticleEdit( $this->title );
 550                 }
 551
 552                 if( $this->title->getNamespace() == NS_FILE ) {
 553                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 554                         $update->doUpdate();
 555                 }
 556
 557                 return $restored;
 558         }
 559
 560         /**
 561          * @return Status
 562          */
 563         function getFileStatus() { return $this->fileStatus; }
 564 }
 565
 566 /**
 567  * Special page allowing users with the appropriate permissions to view
 568  * and restore deleted content.
 569  *
 570  * @ingroup SpecialPage
 571  */
 572 class SpecialUndelete extends SpecialPage {
 573         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 574         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 575
 576         /**
 577          * @var Title
 578          */
 579         var $mTargetObj;
 580
 581         function __construct( $request = null ) {
 582                 parent::__construct( 'Undelete', 'deletedhistory' );
 583
 584                 if ( $request === null ) {
 585                         global $wgRequest;
 586                         $this->mRequest = $wgRequest;
 587                 } else {
 588                         $this->mRequest = $request;
 589                 }
 590         }
 591
 592         function loadRequest() {
 593                 global $wgUser;
 594                 $this->mAction = $this->mRequest->getVal( 'action' );
 595                 $this->mTarget = $this->mRequest->getVal( 'target' );
 596                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 597                 $time = $this->mRequest->getVal( 'timestamp' );
 598                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 599                 $this->mFilename = $this->mRequest->getVal( 'file' );
 600
 601                 $posted = $this->mRequest->wasPosted() &&
 602                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 603                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 604                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 605                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 606                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 607                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 608                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 609                 $this->mToken = $this->mRequest->getVal( 'token' );
 610
 611                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 612                         $this->mAllowed = true; // user can restore
 613                         $this->mCanView = true; // user can view content
 614                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 615                         $this->mAllowed = false; // user cannot restore
 616                         $this->mCanView = true; // user can view content
 617                 } else { // user can only view the list of revisions
 618                         $this->mAllowed = false;
 619                         $this->mCanView = false;
 620                         $this->mTimestamp = '';
 621                         $this->mRestore = false;
 622                 }
 623
 624                 if( $this->mRestore || $this->mInvert ) {
 625                         $timestamps = array();
 626                         $this->mFileVersions = array();
 627                         foreach( $_REQUEST as $key => $val ) {
 628                                 $matches = array();
 629                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 630                                         array_push( $timestamps, $matches[1] );
 631                                 }
 632
 633                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 634                                         $this->mFileVersions[] = intval( $matches[1] );
 635                                 }
 636                         }
 637                         rsort( $timestamps );
 638                         $this->mTargetTimestamp = $timestamps;
 639                 }
 640         }
 641
 642         function execute( $par ) {
 643                 global $wgOut, $wgUser;
 644
 645                 $this->setHeaders();
 646                 if ( !$this->userCanExecute( $wgUser ) ) {
 647                         $this->displayRestrictionError();
 648                         return;
 649                 }
 650                 $this->outputHeader();
 651
 652                 $this->loadRequest();
 653
 654                 if ( $this->mAllowed ) {
 655                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 656                 } else {
 657                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
 658                 }
 659
 660                 if( $par != '' ) {
 661                         $this->mTarget = $par;
 662                 }
 663                 if ( $this->mTarget !== '' ) {
 664                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 665                         $wgUser->getSkin()->setRelevantTitle( $this->mTargetObj );
 666                 } else {
 667                         $this->mTargetObj = null;
 668                 }
 669
 670                 if( is_null( $this->mTargetObj ) ) {
 671                         # Not all users can just browse every deleted page from the list
 672                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 673                                 $this->showSearchForm();
 674
 675                                 # List undeletable articles
 676                                 if( $this->mSearchPrefix ) {
 677                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 678                                         $this->showList( $result );
 679                                 }
 680                         } else {
 681                                 $wgOut->addWikiMsg( 'undelete-header' );
 682                         }
 683                         return;
 684                 }
 685                 if( $this->mTimestamp !== '' ) {
 686                         return $this->showRevision( $this->mTimestamp );
 687                 }
 688                 if( $this->mFilename !== null ) {
 689                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 690                         // Check if user is allowed to see this file
 691                         if ( !$file->exists() ) {
 692                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 693                                 return;
 694                         } elseif( !$file->userCan( File::DELETED_FILE ) ) {
 695                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 696                                         $wgOut->permissionRequired( 'suppressrevision' );
 697                                 } else {
 698                                         $wgOut->permissionRequired( 'deletedtext' );
 699                                 }
 700                                 return false;
 701                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFilename ) ) {
 702                                 $this->showFileConfirmationForm( $this->mFilename );
 703                                 return false;
 704                         } else {
 705                                 return $this->showFile( $this->mFilename );
 706                         }
 707                 }
 708                 if( $this->mRestore && $this->mAction == 'submit' ) {
 709                         global $wgUploadMaintenance;
 710                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 711                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 712                                 return;
 713                         }
 714                         return $this->undelete();
 715                 }
 716                 if( $this->mInvert && $this->mAction == 'submit' ) {
 717                         return $this->showHistory();
 718                 }
 719                 return $this->showHistory();
 720         }
 721
 722         function showSearchForm() {
 723                 global $wgOut, $wgScript;
 724                 $wgOut->addWikiMsg( 'undelete-header' );
 725
 726                 $wgOut->addHTML(
 727                         Xml::openElement( 'form', array(
 728                                 'method' => 'get',
 729                                 'action' => $wgScript ) ) .
 730                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 731                         Html::hidden( 'title',
 732                                 $this->getTitle()->getPrefixedDbKey() ) .
 733                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 734                                 'prefix', 'prefix', 20,
 735                                 $this->mSearchPrefix ) . ' ' .
 736                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 737                         Xml::closeElement( 'fieldset' ) .
 738                         Xml::closeElement( 'form' )
 739                 );
 740         }
 741
 742         /**
 743          * Generic list of deleted pages
 744          *
 745          * @param $result ResultWrapper
 746          * @return bool
 747          */
 748         private function showList( $result ) {
 749                 global $wgLang, $wgUser, $wgOut;
 750
 751                 if( $result->numRows() == 0 ) {
 752                         $wgOut->addWikiMsg( 'undelete-no-results' );
 753                         return;
 754                 }
 755
 756                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 757
 758                 $sk = $wgUser->getSkin();
 759                 $undelete = $this->getTitle();
 760                 $wgOut->addHTML( "<ul>\n" );
 761                 foreach ( $result as $row ) {
 762                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 763                         $link = $sk->linkKnown(
 764                                 $undelete,
 765                                 htmlspecialchars( $title->getPrefixedText() ),
 766                                 array(),
 767                                 array( 'target' => $title->getPrefixedText() )
 768                         );
 769                         $revs = wfMsgExt( 'undeleterevisions',
 770                                 array( 'parseinline' ),
 771                                 $wgLang->formatNum( $row->count ) );
 772                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 773                 }
 774                 $result->free();
 775                 $wgOut->addHTML( "</ul>\n" );
 776
 777                 return true;
 778         }
 779
 780         private function showRevision( $timestamp ) {
 781                 global $wgLang, $wgUser, $wgOut;
 782
 783                 $skin = $wgUser->getSkin();
 784
 785                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 786                         return 0;
 787                 }
 788
 789                 $archive = new PageArchive( $this->mTargetObj );
 790                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 791                 $rev = $archive->getRevision( $timestamp );
 792
 793                 if( !$rev ) {
 794                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 795                         return;
 796                 }
 797
 798                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 799                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 800                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 801                                 return;
 802                         } else {
 803                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 804                                 $wgOut->addHTML( '<br />' );
 805                                 // and we are allowed to see...
 806                         }
 807                 }
 808
 809                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 810
 811                 $link = $skin->linkKnown(
 812                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 813                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 814                 );
 815
 816                 if( $this->mDiff ) {
 817                         $previousRev = $archive->getPreviousRevision( $timestamp );
 818                         if( $previousRev ) {
 819                                 $this->showDiff( $previousRev, $rev );
 820                                 if( $wgUser->getOption( 'diffonly' ) ) {
 821                                         return;
 822                                 } else {
 823                                         $wgOut->addHTML( '<hr />' );
 824                                 }
 825                         } else {
 826                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 827                         }
 828                 }
 829
 830                 // date and time are separate parameters to facilitate localisation.
 831                 // $time is kept for backward compat reasons.
 832                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 833                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 834                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 835                 $user = $skin->revUserTools( $rev );
 836
 837                 if( $this->mPreview ) {
 838                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 839                 } else {
 840                         $openDiv = '<div id="mw-undelete-revision">';
 841                 }
 842                 $wgOut->addHTML( $openDiv );
 843
 844                 // Revision delete links
 845                 if ( !$this->mDiff ) {
 846                         $revdel = $this->revDeleteLink( $rev );
 847                         if ( $revdel ) {
 848                                 $wgOut->addHTML( $revdel );
 849                         }
 850                 }
 851
 852                 $wgOut->addWikiMsgArray( 'undelete-revision', array( $link, $time, $user, $d, $t ), array( 'replaceafter' ) );
 853                 $wgOut->addHTML( '</div>' );
 854                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 855
 856                 if( $this->mPreview ) {
 857                         // Hide [edit]s
 858                         $popts = $wgOut->parserOptions();
 859                         $popts->setEditSection( false );
 860                         $wgOut->parserOptions( $popts );
 861                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 862                 }
 863
 864                 $wgOut->addHTML(
 865                         Xml::element( 'textarea', array(
 866                                         'readonly' => 'readonly',
 867                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 868                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 869                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 870                         Xml::openElement( 'div' ) .
 871                         Xml::openElement( 'form', array(
 872                                 'method' => 'post',
 873                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 874                         Xml::element( 'input', array(
 875                                 'type' => 'hidden',
 876                                 'name' => 'target',
 877                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 878                         Xml::element( 'input', array(
 879                                 'type' => 'hidden',
 880                                 'name' => 'timestamp',
 881                                 'value' => $timestamp ) ) .
 882                         Xml::element( 'input', array(
 883                                 'type' => 'hidden',
 884                                 'name' => 'wpEditToken',
 885                                 'value' => $wgUser->editToken() ) ) .
 886                         Xml::element( 'input', array(
 887                                 'type' => 'submit',
 888                                 'name' => 'preview',
 889                                 'value' => wfMsg( 'showpreview' ) ) ) .
 890                         Xml::element( 'input', array(
 891                                 'name' => 'diff',
 892                                 'type' => 'submit',
 893                                 'value' => wfMsg( 'showdiff' ) ) ) .
 894                         Xml::closeElement( 'form' ) .
 895                         Xml::closeElement( 'div' ) );
 896         }
 897
 898         /**
 899          * Get a revision-deletion link, or disabled link, or nothing, depending
 900          * on user permissions & the settings on the revision.
 901          *
 902          * Will use forward-compatible revision ID in the Special:RevDelete link
 903          * if possible, otherwise the timestamp-based ID which may break after
 904          * undeletion.
 905          *
 906          * @param Revision $rev
 907          * @return string HTML fragment
 908          */
 909         function revDeleteLink( $rev ) {
 910                 global $wgUser;
 911                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 912                 if( $canHide || ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
 913                         $skin = $wgUser->getSkin();
 914                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 915                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 916                         } else {
 917                                 if ( $rev->getId() ) {
 918                                         // RevDelete links using revision ID are stable across
 919                                         // page deletion and undeletion; use when possible.
 920                                         $query = array(
 921                                                 'type'   => 'revision',
 922                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 923                                                 'ids'    => $rev->getId()
 924                                         );
 925                                 } else {
 926                                         // Older deleted entries didn't save a revision ID.
 927                                         // We have to refer to these by timestamp, ick!
 928                                         $query = array(
 929                                                 'type'   => 'archive',
 930                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 931                                                 'ids'    => $rev->getTimestamp()
 932                                         );
 933                                 }
 934                                 return $skin->revDeleteLink( $query,
 935                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 936                         }
 937                 } else {
 938                         return '';
 939                 }
 940         }
 941
 942         /**
 943          * Build a diff display between this and the previous either deleted
 944          * or non-deleted edit.
 945          *
 946          * @param $previousRev Revision
 947          * @param $currentRev Revision
 948          * @return String: HTML
 949          */
 950         function showDiff( $previousRev, $currentRev ) {
 951                 global $wgOut;
 952
 953                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 954                 $diffEngine->showDiffStyle();
 955                 $wgOut->addHTML(
 956                         "<div>" .
 957                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 958                         "<col class='diff-marker' />" .
 959                         "<col class='diff-content' />" .
 960                         "<col class='diff-marker' />" .
 961                         "<col class='diff-content' />" .
 962                         "<tr>" .
 963                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 964                                 $this->diffHeader( $previousRev, 'o' ) .
 965                                 "</td>\n" .
 966                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 967                                 $this->diffHeader( $currentRev, 'n' ) .
 968                                 "</td>\n" .
 969                         "</tr>" .
 970                         $diffEngine->generateDiffBody(
 971                                 $previousRev->getText(), $currentRev->getText() ) .
 972                         "</table>" .
 973                         "</div>\n"
 974                 );
 975         }
 976
 977         /**
 978          * @param $rev Revision
 979          * @param $prefix
 980          * @return string
 981          */
 982         private function diffHeader( $rev, $prefix ) {
 983                 global $wgUser, $wgLang;
 984                 $sk = $wgUser->getSkin();
 985                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 986                 if( $isDeleted ) {
 987                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 988                         $targetPage = $this->getTitle();
 989                         $targetQuery = array(
 990                                 'target' => $this->mTargetObj->getPrefixedText(),
 991                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 992                         );
 993                 } else {
 994                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 995                         $targetPage = $rev->getTitle();
 996                         $targetQuery = array( 'oldid' => $rev->getId() );
 997                 }
 998                 // Add show/hide deletion links if available
 999                 $del = $this->revDeleteLink( $rev );
1000                 return
1001                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1002                                 $sk->link(
1003                                         $targetPage,
1004                                         wfMsgHtml(
1005                                                 'revisionasof',
1006                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
1007                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
1008                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
1009                                         ),
1010                                         array(),
1011                                         $targetQuery
1012                                 ) .
1013                         '</strong></div>' .
1014                         '<div id="mw-diff-'.$prefix.'title2">' .
1015                                 $sk->revUserTools( $rev ) . '<br />' .
1016                         '</div>' .
1017                         '<div id="mw-diff-'.$prefix.'title3">' .
1018                                 $sk->revComment( $rev ) . $del . '<br />' .
1019                         '</div>';
1020         }
1021
1022         /**
1023          * Show a form confirming whether a tokenless user really wants to see a file
1024          */
1025         private function showFileConfirmationForm( $key ) {
1026                 global $wgOut, $wgUser, $wgLang;
1027                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1028                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
1029                         $this->mTargetObj->getText(),
1030                         $wgLang->date( $file->getTimestamp() ),
1031                         $wgLang->time( $file->getTimestamp() ) );
1032                 $wgOut->addHTML(
1033                         Xml::openElement( 'form', array(
1034                                 'method' => 'POST',
1035                                 'action' => $this->getTitle()->getLocalURL(
1036                                         'target=' . urlencode( $this->mTarget ) .
1037                                         '&file=' . urlencode( $key ) .
1038                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
1039                                 )
1040                         ) .
1041                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
1042                         '</form>'
1043                 );
1044         }
1045
1046         /**
1047          * Show a deleted file version requested by the visitor.
1048          */
1049         private function showFile( $key ) {
1050                 global $wgOut, $wgRequest;
1051                 $wgOut->disable();
1052
1053                 # We mustn't allow the output to be Squid cached, otherwise
1054                 # if an admin previews a deleted image, and it's cached, then
1055                 # a user without appropriate permissions can toddle off and
1056                 # nab the image, and Squid will serve it
1057                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1058                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1059                 $wgRequest->response()->header( 'Pragma: no-cache' );
1060
1061                 global $IP;
1062                 require_once( "$IP/includes/StreamFile.php" );
1063                 $repo = RepoGroup::singleton()->getLocalRepo();
1064                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1065                 wfStreamFile( $path );
1066         }
1067
1068         private function showHistory() {
1069                 global $wgUser, $wgOut;
1070
1071                 $sk = $wgUser->getSkin();
1072                 if( $this->mAllowed ) {
1073                         $wgOut->addModules( 'mediawiki.special.undelete' );
1074                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
1075                 } else {
1076                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
1077                 }
1078                 $wgOut->wrapWikiMsg(
1079                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1080                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1081                 );
1082
1083                 $archive = new PageArchive( $this->mTargetObj );
1084                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1085                 /*
1086                 $text = $archive->getLastRevisionText();
1087                 if( is_null( $text ) ) {
1088                         $wgOut->addWikiMsg( 'nohistory' );
1089                         return;
1090                 }
1091                 */
1092                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1093                 if ( $this->mAllowed ) {
1094                         $wgOut->addWikiMsg( 'undeletehistory' );
1095                         $wgOut->addWikiMsg( 'undeleterevdel' );
1096                 } else {
1097                         $wgOut->addWikiMsg( 'undeletehistorynoadmin' );
1098                 }
1099                 $wgOut->addHTML( '</div>' );
1100
1101                 # List all stored revisions
1102                 $revisions = $archive->listRevisions();
1103                 $files = $archive->listFiles();
1104
1105                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1106                 $haveFiles = $files && $files->numRows() > 0;
1107
1108                 # Batch existence check on user and talk pages
1109                 if( $haveRevisions ) {
1110                         $batch = new LinkBatch();
1111                         foreach ( $revisions as $row ) {
1112                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1113                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1114                         }
1115                         $batch->execute();
1116                         $revisions->seek( 0 );
1117                 }
1118                 if( $haveFiles ) {
1119                         $batch = new LinkBatch();
1120                         foreach ( $files as $row ) {
1121                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1122                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1123                         }
1124                         $batch->execute();
1125                         $files->seek( 0 );
1126                 }
1127
1128                 if ( $this->mAllowed ) {
1129                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1130                         # Start the form here
1131                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1132                         $wgOut->addHTML( $top );
1133                 }
1134
1135                 # Show relevant lines from the deletion log:
1136                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1137                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1138                 # Show relevant lines from the suppression log:
1139                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1140                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1141                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1142                 }
1143
1144                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1145                         # Format the user-visible controls (comment field, submission button)
1146                         # in a nice little table
1147                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1148                                 $unsuppressBox =
1149                                         "<tr>
1150                                                 <td>&#160;</td>
1151                                                 <td class='mw-input'>" .
1152                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1153                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1154                                                 "</td>
1155                                         </tr>";
1156                         } else {
1157                                 $unsuppressBox = '';
1158                         }
1159                         $table =
1160                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1161                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1162                                         "<tr>
1163                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1164                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1165                                                 "</td>
1166                                         </tr>
1167                                         <tr>
1168                                                 <td class='mw-label'>" .
1169                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1170                                                 "</td>
1171                                                 <td class='mw-input'>" .
1172                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1173                                                 "</td>
1174                                         </tr>
1175                                         <tr>
1176                                                 <td>&#160;</td>
1177                                                 <td class='mw-submit'>" .
1178                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1179                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1180                                                 "</td>
1181                                         </tr>" .
1182                                         $unsuppressBox .
1183                                 Xml::closeElement( 'table' ) .
1184                                 Xml::closeElement( 'fieldset' );
1185
1186                         $wgOut->addHTML( $table );
1187                 }
1188
1189                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1190
1191                 if( $haveRevisions ) {
1192                         # The page's stored (deleted) history:
1193                         $wgOut->addHTML( '<ul>' );
1194                         $remaining = $revisions->numRows();
1195                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1196
1197                         foreach ( $revisions as $row ) {
1198                                 $remaining--;
1199                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1200                         }
1201                         $revisions->free();
1202                         $wgOut->addHTML( '</ul>' );
1203                 } else {
1204                         $wgOut->addWikiMsg( 'nohistory' );
1205                 }
1206
1207                 if( $haveFiles ) {
1208                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1209                         $wgOut->addHTML( '<ul>' );
1210                         foreach ( $files as $row ) {
1211                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1212                         }
1213                         $files->free();
1214                         $wgOut->addHTML( '</ul>' );
1215                 }
1216
1217                 if ( $this->mAllowed ) {
1218                         # Slip in the hidden controls here
1219                         $misc  = Html::hidden( 'target', $this->mTarget );
1220                         $misc .= Html::hidden( 'wpEditToken', $wgUser->editToken() );
1221                         $misc .= Xml::closeElement( 'form' );
1222                         $wgOut->addHTML( $misc );
1223                 }
1224
1225                 return true;
1226         }
1227
1228         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1229                 global $wgLang;
1230
1231                 $rev = Revision::newFromArchiveRow( $row,
1232                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1233                 $stxt = '';
1234                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1235                 // Build checkboxen...
1236                 if( $this->mAllowed ) {
1237                         if( $this->mInvert ) {
1238                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1239                                         $checkBox = Xml::check( "ts$ts" );
1240                                 } else {
1241                                         $checkBox = Xml::check( "ts$ts", true );
1242                                 }
1243                         } else {
1244                                 $checkBox = Xml::check( "ts$ts" );
1245                         }
1246                 } else {
1247                         $checkBox = '';
1248                 }
1249                 // Build page & diff links...
1250                 if( $this->mCanView ) {
1251                         $titleObj = $this->getTitle();
1252                         # Last link
1253                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1254                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1255                                 $last = wfMsgHtml( 'diff' );
1256                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1257                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1258                                 $last = $sk->linkKnown(
1259                                         $titleObj,
1260                                         wfMsgHtml( 'diff' ),
1261                                         array(),
1262                                         array(
1263                                                 'target' => $this->mTargetObj->getPrefixedText(),
1264                                                 'timestamp' => $ts,
1265                                                 'diff' => 'prev'
1266                                         )
1267                                 );
1268                         } else {
1269                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1270                                 $last = wfMsgHtml( 'diff' );
1271                         }
1272                 } else {
1273                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1274                         $last = wfMsgHtml( 'diff' );
1275                 }
1276                 // User links
1277                 $userLink = $sk->revUserTools( $rev );
1278                 // Revision text size
1279                 $size = $row->ar_len;
1280                 if( !is_null( $size ) ) {
1281                         $stxt = $sk->formatRevisionSize( $size );
1282                 }
1283                 // Edit summary
1284                 $comment = $sk->revComment( $rev );
1285                 // Revision delete links
1286                 $revdlink = $this->revDeleteLink( $rev );
1287                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1288         }
1289
1290         private function formatFileRow( $row, $sk ) {
1291                 global $wgUser, $wgLang;
1292
1293                 $file = ArchivedFile::newFromRow( $row );
1294
1295                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1296                 if( $this->mAllowed && $row->fa_storage_key ) {
1297                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1298                         $key = urlencode( $row->fa_storage_key );
1299                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1300                 } else {
1301                         $checkBox = '';
1302                         $pageLink = $wgLang->timeanddate( $ts, true );
1303                 }
1304                 $userLink = $this->getFileUser( $file, $sk );
1305                 $data =
1306                         wfMsg( 'widthheight',
1307                                 $wgLang->formatNum( $row->fa_width ),
1308                                 $wgLang->formatNum( $row->fa_height ) ) .
1309                         ' (' .
1310                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1311                         ')';
1312                 $data = htmlspecialchars( $data );
1313                 $comment = $this->getFileComment( $file, $sk );
1314                 // Add show/hide deletion links if available
1315                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1316                 if( $canHide || ( $file->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1317                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1318                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1319                         } else {
1320                                 $query = array(
1321                                         'type' => 'filearchive',
1322                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1323                                         'ids' => $row->fa_id
1324                                 );
1325                                 $revdlink = $sk->revDeleteLink( $query,
1326                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1327                         }
1328                 } else {
1329                         $revdlink = '';
1330                 }
1331                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1332         }
1333
1334         /**
1335          * Fetch revision text link if it's available to all users
1336          *
1337          * @param $rev Revision
1338          * @param $sk Skin
1339          * @return string
1340          */
1341         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1342                 global $wgLang;
1343
1344                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1345
1346                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1347                         return '<span class="history-deleted">' . $time . '</span>';
1348                 } else {
1349                         $link = $sk->linkKnown(
1350                                 $titleObj,
1351                                 $time,
1352                                 array(),
1353                                 array(
1354                                         'target' => $this->mTargetObj->getPrefixedText(),
1355                                         'timestamp' => $ts
1356                                 )
1357                         );
1358                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1359                                 $link = '<span class="history-deleted">' . $link . '</span>';
1360                         }
1361                         return $link;
1362                 }
1363         }
1364
1365         /**
1366          * Fetch image view link if it's available to all users
1367          *
1368          * @param $file File
1369          * @param $sk Skin
1370          * @return String: HTML fragment
1371          */
1372         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1373                 global $wgLang, $wgUser;
1374
1375                 if( !$file->userCan( File::DELETED_FILE ) ) {
1376                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1377                 } else {
1378                         $link = $sk->linkKnown(
1379                                 $titleObj,
1380                                 $wgLang->timeanddate( $ts, true ),
1381                                 array(),
1382                                 array(
1383                                         'target' => $this->mTargetObj->getPrefixedText(),
1384                                         'file' => $key,
1385                                         'token' => $wgUser->editToken( $key )
1386                                 )
1387                         );
1388                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1389                                 $link = '<span class="history-deleted">' . $link . '</span>';
1390                         }
1391                         return $link;
1392                 }
1393         }
1394
1395         /**
1396          * Fetch file's user id if it's available to this user
1397          *
1398          * @param $file File
1399          * @param $sk Skin
1400          * @return String: HTML fragment
1401          */
1402         function getFileUser( $file, $sk ) {
1403                 if( !$file->userCan( File::DELETED_USER ) ) {
1404                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1405                 } else {
1406                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1407                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1408                         if( $file->isDeleted( File::DELETED_USER ) ) {
1409                                 $link = '<span class="history-deleted">' . $link . '</span>';
1410                         }
1411                         return $link;
1412                 }
1413         }
1414
1415         /**
1416          * Fetch file upload comment if it's available to this user
1417          *
1418          * @param $file File
1419          * @param $sk Skin
1420          * @return String: HTML fragment
1421          */
1422         function getFileComment( $file, $sk ) {
1423                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1424                         return '<span class="history-deleted"><span class="comment">' .
1425                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1426                 } else {
1427                         $link = $sk->commentBlock( $file->getRawDescription() );
1428                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1429                                 $link = '<span class="history-deleted">' . $link . '</span>';
1430                         }
1431                         return $link;
1432                 }
1433         }
1434
1435         function undelete() {
1436                 global $wgOut, $wgUser;
1437                 if ( wfReadOnly() ) {
1438                         $wgOut->readOnlyPage();
1439                         return;
1440                 }
1441                 if( !is_null( $this->mTargetObj ) ) {
1442                         $archive = new PageArchive( $this->mTargetObj );
1443                         wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1444                         $ok = $archive->undelete(
1445                                 $this->mTargetTimestamp,
1446                                 $this->mComment,
1447                                 $this->mFileVersions,
1448                                 $this->mUnsuppress );
1449
1450                         if( is_array( $ok ) ) {
1451                                 if ( $ok[1] ) { // Undeleted file count
1452                                         wfRunHooks( 'FileUndeleteComplete', array(
1453                                                 $this->mTargetObj, $this->mFileVersions,
1454                                                 $wgUser, $this->mComment ) );
1455                                 }
1456
1457                                 $skin = $wgUser->getSkin();
1458                                 $link = $skin->linkKnown( $this->mTargetObj );
1459                                 $wgOut->addWikiMsgArray( 'undeletedpage', array( $link ), array( 'replaceafter' ) );
1460                         } else {
1461                                 $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1462                                 $wgOut->addWikiMsg( 'undeleterevdel' );
1463                         }
1464
1465                         // Show file deletion warnings and errors
1466                         $status = $archive->getFileStatus();
1467                         if( $status && !$status->isGood() ) {
1468                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1469                         }
1470                 } else {
1471                         $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1472                 }
1473                 return false;
1474         }
1475 }