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                 $oldcountable = $article->isCountable();
 536
 537                 // Attach the latest revision to the page...
 538                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 539                 if ( $created || $wasnew ) {
 540                         // Update site stats, link tables, etc
 541                         $user = User::newFromName( $revision->getRawUserText(), false );
 542                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 543                 }
 544
 545                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 546
 547                 if( $this->title->getNamespace() == NS_FILE ) {
 548                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 549                         $update->doUpdate();
 550                 }
 551
 552                 return $restored;
 553         }
 554
 555         /**
 556          * @return Status
 557          */
 558         function getFileStatus() { return $this->fileStatus; }
 559 }
 560
 561 /**
 562  * Special page allowing users with the appropriate permissions to view
 563  * and restore deleted content.
 564  *
 565  * @ingroup SpecialPage
 566  */
 567 class SpecialUndelete extends SpecialPage {
 568         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 569         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 570
 571         /**
 572          * @var Title
 573          */
 574         var $mTargetObj;
 575
 576         function __construct() {
 577                 parent::__construct( 'Undelete', 'deletedhistory' );
 578         }
 579
 580         function loadRequest() {
 581                 $request = $this->getRequest();
 582                 $user = $this->getUser();
 583
 584                 $this->mAction = $request->getVal( 'action' );
 585                 $this->mTarget = $request->getVal( 'target' );
 586                 $this->mSearchPrefix = $request->getText( 'prefix' );
 587                 $time = $request->getVal( 'timestamp' );
 588                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 589                 $this->mFilename = $request->getVal( 'file' );
 590
 591                 $posted = $request->wasPosted() &&
 592                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 593                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 594                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 595                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 596                 $this->mDiff = $request->getCheck( 'diff' );
 597                 $this->mComment = $request->getText( 'wpComment' );
 598                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 599                 $this->mToken = $request->getVal( 'token' );
 600
 601                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 602                         $this->mAllowed = true; // user can restore
 603                         $this->mCanView = true; // user can view content
 604                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 605                         $this->mAllowed = false; // user cannot restore
 606                         $this->mCanView = true; // user can view content
 607                 } else { // user can only view the list of revisions
 608                         $this->mAllowed = false;
 609                         $this->mCanView = false;
 610                         $this->mTimestamp = '';
 611                         $this->mRestore = false;
 612                 }
 613
 614                 if( $this->mRestore || $this->mInvert ) {
 615                         $timestamps = array();
 616                         $this->mFileVersions = array();
 617                         foreach( $request->getValues() as $key => $val ) {
 618                                 $matches = array();
 619                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 620                                         array_push( $timestamps, $matches[1] );
 621                                 }
 622
 623                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 624                                         $this->mFileVersions[] = intval( $matches[1] );
 625                                 }
 626                         }
 627                         rsort( $timestamps );
 628                         $this->mTargetTimestamp = $timestamps;
 629                 }
 630         }
 631
 632         function execute( $par ) {
 633                 $this->setHeaders();
 634                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 635                         $this->displayRestrictionError();
 636                         return;
 637                 }
 638
 639                 if ( $this->getUser()->isBlocked() ) {
 640                         throw new UserBlockedError( $this->getUser()->getBlock() );
 641                 }
 642
 643                 $this->outputHeader();
 644
 645                 $this->loadRequest();
 646
 647                 $out = $this->getOutput();
 648
 649                 if ( $this->mAllowed ) {
 650                         $out->setPageTitle( wfMsg( 'undeletepage' ) );
 651                 } else {
 652                         $out->setPageTitle( wfMsg( 'viewdeletedpage' ) );
 653                 }
 654
 655                 if( $par != '' ) {
 656                         $this->mTarget = $par;
 657                 }
 658                 if ( $this->mTarget !== '' ) {
 659                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 660                         $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 661                 } else {
 662                         $this->mTargetObj = null;
 663                 }
 664
 665                 if( is_null( $this->mTargetObj ) ) {
 666                         # Not all users can just browse every deleted page from the list
 667                         if( $this->getUser()->isAllowed( 'browsearchive' ) ) {
 668                                 $this->showSearchForm();
 669
 670                                 # List undeletable articles
 671                                 if( $this->mSearchPrefix ) {
 672                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 673                                         $this->showList( $result );
 674                                 }
 675                         } else {
 676                                 $out->addWikiMsg( 'undelete-header' );
 677                         }
 678                         return;
 679                 }
 680                 if( $this->mTimestamp !== '' ) {
 681                         return $this->showRevision( $this->mTimestamp );
 682                 }
 683                 if( $this->mFilename !== null ) {
 684                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 685                         // Check if user is allowed to see this file
 686                         if ( !$file->exists() ) {
 687                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 688                                 return;
 689                         } elseif( !$file->userCan( File::DELETED_FILE ) ) {
 690                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 691                                         $out->permissionRequired( 'suppressrevision' );
 692                                 } else {
 693                                         $out->permissionRequired( 'deletedtext' );
 694                                 }
 695                                 return false;
 696                         } elseif ( !$this->getUser()->matchEditToken( $this->mToken, $this->mFilename ) ) {
 697                                 $this->showFileConfirmationForm( $this->mFilename );
 698                                 return false;
 699                         } else {
 700                                 return $this->showFile( $this->mFilename );
 701                         }
 702                 }
 703                 if( $this->mRestore && $this->mAction == 'submit' ) {
 704                         global $wgUploadMaintenance;
 705                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 706                                 $out->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 707                                 return;
 708                         }
 709                         return $this->undelete();
 710                 }
 711                 if( $this->mInvert && $this->mAction == 'submit' ) {
 712                         return $this->showHistory();
 713                 }
 714                 return $this->showHistory();
 715         }
 716
 717         function showSearchForm() {
 718                 global $wgScript;
 719
 720                 $this->getOutput()->addWikiMsg( 'undelete-header' );
 721
 722                 $this->getOutput()->addHTML(
 723                         Xml::openElement( 'form', array(
 724                                 'method' => 'get',
 725                                 'action' => $wgScript ) ) .
 726                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 727                         Html::hidden( 'title',
 728                                 $this->getTitle()->getPrefixedDbKey() ) .
 729                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 730                                 'prefix', 'prefix', 20,
 731                                 $this->mSearchPrefix ) . ' ' .
 732                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 733                         Xml::closeElement( 'fieldset' ) .
 734                         Xml::closeElement( 'form' )
 735                 );
 736         }
 737
 738         /**
 739          * Generic list of deleted pages
 740          *
 741          * @param $result ResultWrapper
 742          * @return bool
 743          */
 744         private function showList( $result ) {
 745                 $out = $this->getOutput();
 746
 747                 if( $result->numRows() == 0 ) {
 748                         $out->addWikiMsg( 'undelete-no-results' );
 749                         return;
 750                 }
 751
 752                 $out->addWikiMsg( 'undeletepagetext', $this->getLang()->formatNum( $result->numRows() ) );
 753
 754                 $undelete = $this->getTitle();
 755                 $out->addHTML( "<ul>\n" );
 756                 foreach ( $result as $row ) {
 757                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 758                         $link = Linker::linkKnown(
 759                                 $undelete,
 760                                 htmlspecialchars( $title->getPrefixedText() ),
 761                                 array(),
 762                                 array( 'target' => $title->getPrefixedText() )
 763                         );
 764                         $revs = wfMsgExt( 'undeleterevisions',
 765                                 array( 'parseinline' ),
 766                                 $this->getLang()->formatNum( $row->count ) );
 767                         $out->addHTML( "<li>{$link} ({$revs})</li>\n" );
 768                 }
 769                 $result->free();
 770                 $out->addHTML( "</ul>\n" );
 771
 772                 return true;
 773         }
 774
 775         private function showRevision( $timestamp ) {
 776                 $out = $this->getOutput();
 777
 778                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 779                         return 0;
 780                 }
 781
 782                 $archive = new PageArchive( $this->mTargetObj );
 783                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 784                 $rev = $archive->getRevision( $timestamp );
 785
 786                 if( !$rev ) {
 787                         $out->addWikiMsg( 'undeleterevision-missing' );
 788                         return;
 789                 }
 790
 791                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 792                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 793                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 794                                 return;
 795                         } else {
 796                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 797                                 $out->addHTML( '<br />' );
 798                                 // and we are allowed to see...
 799                         }
 800                 }
 801
 802                 $out->setPageTitle( wfMsg( 'undeletepage' ) );
 803
 804                 if( $this->mDiff ) {
 805                         $previousRev = $archive->getPreviousRevision( $timestamp );
 806                         if( $previousRev ) {
 807                                 $this->showDiff( $previousRev, $rev );
 808                                 if( $this->getUser()->getOption( 'diffonly' ) ) {
 809                                         return;
 810                                 } else {
 811                                         $out->addHTML( '<hr />' );
 812                                 }
 813                         } else {
 814                                 $out->addWikiMsg( 'undelete-nodiff' );
 815                         }
 816                 }
 817
 818                 $link = Linker::linkKnown(
 819                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 820                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 821                 );
 822
 823                 // date and time are separate parameters to facilitate localisation.
 824                 // $time is kept for backward compat reasons.
 825                 $time = $this->getLang()->timeAndDate( $timestamp, true );
 826                 $d = $this->getLang()->date( $timestamp, true );
 827                 $t = $this->getLang()->time( $timestamp, true );
 828                 $user = Linker::revUserTools( $rev );
 829
 830                 if( $this->mPreview ) {
 831                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 832                 } else {
 833                         $openDiv = '<div id="mw-undelete-revision">';
 834                 }
 835                 $out->addHTML( $openDiv );
 836
 837                 // Revision delete links
 838                 if ( !$this->mDiff ) {
 839                         $revdel = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
 840                         if ( $revdel ) {
 841                                 $out->addHTML( "$revdel " );
 842                         }
 843                 }
 844
 845                 $out->addHTML( wfMessage( 'undelete-revision' )->rawParams( $link )->params(
 846                         $time )->rawParams( $user )->params( $d, $t )->parse() . '</div>' );
 847                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 848
 849                 if( $this->mPreview ) {
 850                         // Hide [edit]s
 851                         $popts = $out->parserOptions();
 852                         $popts->setEditSection( false );
 853                         $out->parserOptions( $popts );
 854                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 855                 }
 856
 857                 $out->addHTML(
 858                         Xml::element( 'textarea', array(
 859                                         'readonly' => 'readonly',
 860                                         'cols' => intval( $this->getUser()->getOption( 'cols' ) ),
 861                                         'rows' => intval( $this->getUser()->getOption( 'rows' ) ) ),
 862                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 863                         Xml::openElement( 'div' ) .
 864                         Xml::openElement( 'form', array(
 865                                 'method' => 'post',
 866                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 867                         Xml::element( 'input', array(
 868                                 'type' => 'hidden',
 869                                 'name' => 'target',
 870                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 871                         Xml::element( 'input', array(
 872                                 'type' => 'hidden',
 873                                 'name' => 'timestamp',
 874                                 'value' => $timestamp ) ) .
 875                         Xml::element( 'input', array(
 876                                 'type' => 'hidden',
 877                                 'name' => 'wpEditToken',
 878                                 'value' => $this->getUser()->editToken() ) ) .
 879                         Xml::element( 'input', array(
 880                                 'type' => 'submit',
 881                                 'name' => 'preview',
 882                                 'value' => wfMsg( 'showpreview' ) ) ) .
 883                         Xml::element( 'input', array(
 884                                 'name' => 'diff',
 885                                 'type' => 'submit',
 886                                 'value' => wfMsg( 'showdiff' ) ) ) .
 887                         Xml::closeElement( 'form' ) .
 888                         Xml::closeElement( 'div' ) );
 889         }
 890
 891         /**
 892          * Build a diff display between this and the previous either deleted
 893          * or non-deleted edit.
 894          *
 895          * @param $previousRev Revision
 896          * @param $currentRev Revision
 897          * @return String: HTML
 898          */
 899         function showDiff( $previousRev, $currentRev ) {
 900                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 901                 $diffEngine->showDiffStyle();
 902                 $this->getOutput()->addHTML(
 903                         "<div>" .
 904                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 905                         "<col class='diff-marker' />" .
 906                         "<col class='diff-content' />" .
 907                         "<col class='diff-marker' />" .
 908                         "<col class='diff-content' />" .
 909                         "<tr>" .
 910                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 911                                 $this->diffHeader( $previousRev, 'o' ) .
 912                                 "</td>\n" .
 913                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 914                                 $this->diffHeader( $currentRev, 'n' ) .
 915                                 "</td>\n" .
 916                         "</tr>" .
 917                         $diffEngine->generateDiffBody(
 918                                 $previousRev->getText(), $currentRev->getText() ) .
 919                         "</table>" .
 920                         "</div>\n"
 921                 );
 922         }
 923
 924         /**
 925          * @param $rev Revision
 926          * @param $prefix
 927          * @return string
 928          */
 929         private function diffHeader( $rev, $prefix ) {
 930                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 931                 if( $isDeleted ) {
 932                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 933                         $targetPage = $this->getTitle();
 934                         $targetQuery = array(
 935                                 'target' => $this->mTargetObj->getPrefixedText(),
 936                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 937                         );
 938                 } else {
 939                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 940                         $targetPage = $rev->getTitle();
 941                         $targetQuery = array( 'oldid' => $rev->getId() );
 942                 }
 943                 // Add show/hide deletion links if available
 944                 $rdel = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
 945                 if ( $rdel ) $rdel = " $rdel";
 946                 return
 947                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 948                                 Linker::link(
 949                                         $targetPage,
 950                                         wfMsgExt(
 951                                                 'revisionasof',
 952                                                 array( 'escape' ),
 953                                                 $this->getLang()->timeanddate( $rev->getTimestamp(), true ),
 954                                                 $this->getLang()->date( $rev->getTimestamp(), true ),
 955                                                 $this->getLang()->time( $rev->getTimestamp(), true )
 956                                         ),
 957                                         array(),
 958                                         $targetQuery
 959                                 ) .
 960                         '</strong></div>' .
 961                         '<div id="mw-diff-'.$prefix.'title2">' .
 962                                 Linker::revUserTools( $rev ) . '<br />' .
 963                         '</div>' .
 964                         '<div id="mw-diff-'.$prefix.'title3">' .
 965                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 966                         '</div>';
 967         }
 968
 969         /**
 970          * Show a form confirming whether a tokenless user really wants to see a file
 971          */
 972         private function showFileConfirmationForm( $key ) {
 973                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 974                 $this->getOutput()->addWikiMsg( 'undelete-show-file-confirm',
 975                         $this->mTargetObj->getText(),
 976                         $this->getLang()->date( $file->getTimestamp() ),
 977                         $this->getLang()->time( $file->getTimestamp() ) );
 978                 $this->getOutput()->addHTML(
 979                         Xml::openElement( 'form', array(
 980                                 'method' => 'POST',
 981                                 'action' => $this->getTitle()->getLocalURL(
 982                                         'target=' . urlencode( $this->mTarget ) .
 983                                         '&file=' . urlencode( $key ) .
 984                                         '&token=' . urlencode( $this->getUser()->editToken( $key ) ) )
 985                                 )
 986                         ) .
 987                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
 988                         '</form>'
 989                 );
 990         }
 991
 992         /**
 993          * Show a deleted file version requested by the visitor.
 994          */
 995         private function showFile( $key ) {
 996                 $this->getOutput()->disable();
 997
 998                 # We mustn't allow the output to be Squid cached, otherwise
 999                 # if an admin previews a deleted image, and it's cached, then
1000                 # a user without appropriate permissions can toddle off and
1001                 # nab the image, and Squid will serve it
1002                 $response = $this->getRequest()->response();
1003                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1004                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1005                 $response->header( 'Pragma: no-cache' );
1006
1007                 $repo = RepoGroup::singleton()->getLocalRepo();
1008                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1009                 StreamFile::stream( $path );
1010         }
1011
1012         private function showHistory() {
1013                 $out = $this->getOutput();
1014                 if( $this->mAllowed ) {
1015                         $out->addModules( 'mediawiki.special.undelete' );
1016                         $out->setPageTitle( wfMsg( 'undeletepage' ) );
1017                 } else {
1018                         $out->setPageTitle( wfMsg( 'viewdeletedpage' ) );
1019                 }
1020                 $out->wrapWikiMsg(
1021                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1022                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1023                 );
1024
1025                 $archive = new PageArchive( $this->mTargetObj );
1026                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1027                 /*
1028                 $text = $archive->getLastRevisionText();
1029                 if( is_null( $text ) ) {
1030                         $out->addWikiMsg( 'nohistory' );
1031                         return;
1032                 }
1033                 */
1034                 $out->addHTML( '<div class="mw-undelete-history">' );
1035                 if ( $this->mAllowed ) {
1036                         $out->addWikiMsg( 'undeletehistory' );
1037                         $out->addWikiMsg( 'undeleterevdel' );
1038                 } else {
1039                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1040                 }
1041                 $out->addHTML( '</div>' );
1042
1043                 # List all stored revisions
1044                 $revisions = $archive->listRevisions();
1045                 $files = $archive->listFiles();
1046
1047                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1048                 $haveFiles = $files && $files->numRows() > 0;
1049
1050                 # Batch existence check on user and talk pages
1051                 if( $haveRevisions ) {
1052                         $batch = new LinkBatch();
1053                         foreach ( $revisions as $row ) {
1054                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1055                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1056                         }
1057                         $batch->execute();
1058                         $revisions->seek( 0 );
1059                 }
1060                 if( $haveFiles ) {
1061                         $batch = new LinkBatch();
1062                         foreach ( $files as $row ) {
1063                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1064                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1065                         }
1066                         $batch->execute();
1067                         $files->seek( 0 );
1068                 }
1069
1070                 if ( $this->mAllowed ) {
1071                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1072                         # Start the form here
1073                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1074                         $out->addHTML( $top );
1075                 }
1076
1077                 # Show relevant lines from the deletion log:
1078                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1079                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj->getPrefixedText() );
1080                 # Show relevant lines from the suppression log:
1081                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1082                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1083                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj->getPrefixedText() );
1084                 }
1085
1086                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1087                         # Format the user-visible controls (comment field, submission button)
1088                         # in a nice little table
1089                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1090                                 $unsuppressBox =
1091                                         "<tr>
1092                                                 <td>&#160;</td>
1093                                                 <td class='mw-input'>" .
1094                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1095                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1096                                                 "</td>
1097                                         </tr>";
1098                         } else {
1099                                 $unsuppressBox = '';
1100                         }
1101                         $table =
1102                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1103                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1104                                         "<tr>
1105                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1106                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1107                                                 "</td>
1108                                         </tr>
1109                                         <tr>
1110                                                 <td class='mw-label'>" .
1111                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1112                                                 "</td>
1113                                                 <td class='mw-input'>" .
1114                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1115                                                 "</td>
1116                                         </tr>
1117                                         <tr>
1118                                                 <td>&#160;</td>
1119                                                 <td class='mw-submit'>" .
1120                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1121                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1122                                                 "</td>
1123                                         </tr>" .
1124                                         $unsuppressBox .
1125                                 Xml::closeElement( 'table' ) .
1126                                 Xml::closeElement( 'fieldset' );
1127
1128                         $out->addHTML( $table );
1129                 }
1130
1131                 $out->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1132
1133                 if( $haveRevisions ) {
1134                         # The page's stored (deleted) history:
1135                         $out->addHTML( '<ul>' );
1136                         $remaining = $revisions->numRows();
1137                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1138
1139                         foreach ( $revisions as $row ) {
1140                                 $remaining--;
1141                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1142                         }
1143                         $revisions->free();
1144                         $out->addHTML( '</ul>' );
1145                 } else {
1146                         $out->addWikiMsg( 'nohistory' );
1147                 }
1148
1149                 if( $haveFiles ) {
1150                         $out->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1151                         $out->addHTML( '<ul>' );
1152                         foreach ( $files as $row ) {
1153                                 $out->addHTML( $this->formatFileRow( $row ) );
1154                         }
1155                         $files->free();
1156                         $out->addHTML( '</ul>' );
1157                 }
1158
1159                 if ( $this->mAllowed ) {
1160                         # Slip in the hidden controls here
1161                         $misc  = Html::hidden( 'target', $this->mTarget );
1162                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->editToken() );
1163                         $misc .= Xml::closeElement( 'form' );
1164                         $out->addHTML( $misc );
1165                 }
1166
1167                 return true;
1168         }
1169
1170         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1171                 $rev = Revision::newFromArchiveRow( $row,
1172                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1173                 $stxt = '';
1174                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1175                 // Build checkboxen...
1176                 if( $this->mAllowed ) {
1177                         if( $this->mInvert ) {
1178                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1179                                         $checkBox = Xml::check( "ts$ts" );
1180                                 } else {
1181                                         $checkBox = Xml::check( "ts$ts", true );
1182                                 }
1183                         } else {
1184                                 $checkBox = Xml::check( "ts$ts" );
1185                         }
1186                 } else {
1187                         $checkBox = '';
1188                 }
1189                 // Build page & diff links...
1190                 if( $this->mCanView ) {
1191                         $titleObj = $this->getTitle();
1192                         # Last link
1193                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1194                                 $pageLink = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1195                                 $last = wfMsgHtml( 'diff' );
1196                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1197                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1198                                 $last = Linker::linkKnown(
1199                                         $titleObj,
1200                                         wfMsgHtml( 'diff' ),
1201                                         array(),
1202                                         array(
1203                                                 'target' => $this->mTargetObj->getPrefixedText(),
1204                                                 'timestamp' => $ts,
1205                                                 'diff' => 'prev'
1206                                         )
1207                                 );
1208                         } else {
1209                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1210                                 $last = wfMsgHtml( 'diff' );
1211                         }
1212                 } else {
1213                         $pageLink = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1214                         $last = wfMsgHtml( 'diff' );
1215                 }
1216                 // User links
1217                 $userLink = Linker::revUserTools( $rev );
1218                 // Revision text size
1219                 $size = $row->ar_len;
1220                 if( !is_null( $size ) ) {
1221                         $stxt = Linker::formatRevisionSize( $size );
1222                 }
1223                 // Edit summary
1224                 $comment = Linker::revComment( $rev );
1225                 // Revision delete links
1226                 $revdlink = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
1227                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1228         }
1229
1230         private function formatFileRow( $row ) {
1231                 $file = ArchivedFile::newFromRow( $row );
1232
1233                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1234                 if( $this->mAllowed && $row->fa_storage_key ) {
1235                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1236                         $key = urlencode( $row->fa_storage_key );
1237                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1238                 } else {
1239                         $checkBox = '';
1240                         $pageLink = $this->getLang()->timeanddate( $ts, true );
1241                 }
1242                 $userLink = $this->getFileUser( $file );
1243                 $data =
1244                         wfMsg( 'widthheight',
1245                                 $this->getLang()->formatNum( $row->fa_width ),
1246                                 $this->getLang()->formatNum( $row->fa_height ) ) .
1247                         ' (' .
1248                         wfMsg( 'nbytes', $this->getLang()->formatNum( $row->fa_size ) ) .
1249                         ')';
1250                 $data = htmlspecialchars( $data );
1251                 $comment = $this->getFileComment( $file );
1252
1253                 // Add show/hide deletion links if available
1254                 $canHide = $this->getUser()->isAllowed( 'deleterevision' );
1255                 if( $canHide || ( $file->getVisibility() && $this->getUser()->isAllowed( 'deletedhistory' ) ) ) {
1256                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1257                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1258                         } else {
1259                                 $query = array(
1260                                         'type' => 'filearchive',
1261                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1262                                         'ids' => $row->fa_id
1263                                 );
1264                                 $revdlink = Linker::revDeleteLink( $query,
1265                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1266                         }
1267                 } else {
1268                         $revdlink = '';
1269                 }
1270
1271                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1272         }
1273
1274         /**
1275          * Fetch revision text link if it's available to all users
1276          *
1277          * @param $rev Revision
1278          * @return string
1279          */
1280         function getPageLink( $rev, $titleObj, $ts ) {
1281                 $time = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1282
1283                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1284                         return '<span class="history-deleted">' . $time . '</span>';
1285                 } else {
1286                         $link = Linker::linkKnown(
1287                                 $titleObj,
1288                                 $time,
1289                                 array(),
1290                                 array(
1291                                         'target' => $this->mTargetObj->getPrefixedText(),
1292                                         'timestamp' => $ts
1293                                 )
1294                         );
1295                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1296                                 $link = '<span class="history-deleted">' . $link . '</span>';
1297                         }
1298                         return $link;
1299                 }
1300         }
1301
1302         /**
1303          * Fetch image view link if it's available to all users
1304          *
1305          * @param $file File
1306          * @return String: HTML fragment
1307          */
1308         function getFileLink( $file, $titleObj, $ts, $key ) {
1309                 if( !$file->userCan( File::DELETED_FILE ) ) {
1310                         return '<span class="history-deleted">' . $this->getLang()->timeanddate( $ts, true ) . '</span>';
1311                 } else {
1312                         $link = Linker::linkKnown(
1313                                 $titleObj,
1314                                 $this->getLang()->timeanddate( $ts, true ),
1315                                 array(),
1316                                 array(
1317                                         'target' => $this->mTargetObj->getPrefixedText(),
1318                                         'file' => $key,
1319                                         'token' => $this->getUser()->editToken( $key )
1320                                 )
1321                         );
1322                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1323                                 $link = '<span class="history-deleted">' . $link . '</span>';
1324                         }
1325                         return $link;
1326                 }
1327         }
1328
1329         /**
1330          * Fetch file's user id if it's available to this user
1331          *
1332          * @param $file File
1333          * @return String: HTML fragment
1334          */
1335         function getFileUser( $file ) {
1336                 if( !$file->userCan( File::DELETED_USER ) ) {
1337                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1338                 } else {
1339                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1340                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1341                         if( $file->isDeleted( File::DELETED_USER ) ) {
1342                                 $link = '<span class="history-deleted">' . $link . '</span>';
1343                         }
1344                         return $link;
1345                 }
1346         }
1347
1348         /**
1349          * Fetch file upload comment if it's available to this user
1350          *
1351          * @param $file File
1352          * @return String: HTML fragment
1353          */
1354         function getFileComment( $file ) {
1355                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1356                         return '<span class="history-deleted"><span class="comment">' .
1357                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1358                 } else {
1359                         $link = Linker::commentBlock( $file->getRawDescription() );
1360                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1361                                 $link = '<span class="history-deleted">' . $link . '</span>';
1362                         }
1363                         return $link;
1364                 }
1365         }
1366
1367         function undelete() {
1368                 if ( wfReadOnly() ) {
1369                         throw new ReadOnlyError;
1370                 }
1371
1372                 if( !is_null( $this->mTargetObj ) ) {
1373                         $archive = new PageArchive( $this->mTargetObj );
1374                         wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1375                         $ok = $archive->undelete(
1376                                 $this->mTargetTimestamp,
1377                                 $this->mComment,
1378                                 $this->mFileVersions,
1379                                 $this->mUnsuppress );
1380
1381                         if( is_array( $ok ) ) {
1382                                 if ( $ok[1] ) { // Undeleted file count
1383                                         wfRunHooks( 'FileUndeleteComplete', array(
1384                                                 $this->mTargetObj, $this->mFileVersions,
1385                                                 $this->getUser(), $this->mComment ) );
1386                                 }
1387
1388                                 $link = Linker::linkKnown( $this->mTargetObj );
1389                                 $this->getOutput()->addHTML( wfMessage( 'undeletedpage' )->rawParams( $link )->parse() );
1390                         } else {
1391                                 $this->getOutput()->showFatalError( wfMsg( 'cannotundelete' ) );
1392                                 $this->getOutput()->addWikiMsg( 'undeleterevdel' );
1393                         }
1394
1395                         // Show file deletion warnings and errors
1396                         $status = $archive->getFileStatus();
1397                         if( $status && !$status->isGood() ) {
1398                                 $this->getOutput()->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1399                         }
1400                 } else {
1401                         $this->getOutput()->showFatalError( wfMsg( 'cannotundelete' ) );
1402                 }
1403                 return false;
1404         }
1405 }