includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30
  31         /**
  32          * @var Title
  33          */
  34         protected $title;
  35         var $fileStatus;
  36
  37         function __construct( $title ) {
  38                 if( is_null( $title ) ) {
  39                         throw new MWException( __METHOD__ . ' given a null title.' );
  40                 }
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * List all deleted pages recorded in the archive table. Returns result
  46          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  47          * namespace/title.
  48          *
  49          * @return ResultWrapper
  50          */
  51         public static function listAllPages() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53                 return self::listPages( $dbr, '' );
  54         }
  55
  56         /**
  57          * List deleted pages recorded in the archive table matching the
  58          * given title prefix.
  59          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  60          *
  61          * @param $prefix String: title prefix
  62          * @return ResultWrapper
  63          */
  64         public static function listPagesByPrefix( $prefix ) {
  65                 global $wgUser;
  66                 $dbr = wfGetDB( DB_SLAVE );
  67
  68                 $title = Title::newFromText( $prefix );
  69                 if( $title ) {
  70                         $ns = $title->getNamespace();
  71                         $prefix = $title->getDBkey();
  72                 } else {
  73                         // Prolly won't work too good
  74                         // @todo handle bare namespace names cleanly?
  75                         $ns = 0;
  76                 }
  77                 $conds = array(
  78                         'ar_namespace' => $ns,
  79                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  80                 );
  81
  82                 // bug 19725
  83                 $suppressedText = REVISION::DELETED_TEXT | REVISION::DELETED_RESTRICTED;
  84                 if( !$wgUser->isAllowed( 'suppressrevision' ) ) {
  85                         $conds[] = $dbr->bitAnd('ar_deleted', $suppressedText ) .
  86                                 ' != ' . $suppressedText;
  87                 }
  88                 return self::listPages( $dbr, $conds );
  89         }
  90
  91         /**
  92          * @param $dbr DatabaseBase
  93          * @param $condition
  94          * @return bool|ResultWrapper
  95          */
  96         protected static function listPages( $dbr, $condition ) {
  97                 return $dbr->resultObject(
  98                         $dbr->select(
  99                                 array( 'archive' ),
 100                                 array(
 101                                         'ar_namespace',
 102                                         'ar_title',
 103                                         'COUNT(*) AS count'
 104                                 ),
 105                                 $condition,
 106                                 __METHOD__,
 107                                 array(
 108                                         'GROUP BY' => 'ar_namespace,ar_title',
 109                                         'ORDER BY' => 'ar_namespace,ar_title',
 110                                         'LIMIT' => 100,
 111                                 )
 112                         )
 113                 );
 114         }
 115
 116         /**
 117          * List the revisions of the given page. Returns result wrapper with
 118          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 119          *
 120          * @return ResultWrapper
 121          */
 122         function listRevisions() {
 123                 $dbr = wfGetDB( DB_SLAVE );
 124                 $res = $dbr->select( 'archive',
 125                         array(
 126                                 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 127                                 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id'
 128                         ),
 129                         array( 'ar_namespace' => $this->title->getNamespace(),
 130                                    'ar_title' => $this->title->getDBkey() ),
 131                         'PageArchive::listRevisions',
 132                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 133                 $ret = $dbr->resultObject( $res );
 134                 return $ret;
 135         }
 136
 137         /**
 138          * List the deleted file revisions for this page, if it's a file page.
 139          * Returns a result wrapper with various filearchive fields, or null
 140          * if not a file page.
 141          *
 142          * @return ResultWrapper
 143          * @todo Does this belong in Image for fuller encapsulation?
 144          */
 145         function listFiles() {
 146                 if( $this->title->getNamespace() == NS_FILE ) {
 147                         $dbr = wfGetDB( DB_SLAVE );
 148                         $res = $dbr->select( 'filearchive',
 149                                 array(
 150                                         'fa_id',
 151                                         'fa_name',
 152                                         'fa_archive_name',
 153                                         'fa_storage_key',
 154                                         'fa_storage_group',
 155                                         'fa_size',
 156                                         'fa_width',
 157                                         'fa_height',
 158                                         'fa_bits',
 159                                         'fa_metadata',
 160                                         'fa_media_type',
 161                                         'fa_major_mime',
 162                                         'fa_minor_mime',
 163                                         'fa_description',
 164                                         'fa_user',
 165                                         'fa_user_text',
 166                                         'fa_timestamp',
 167                                         'fa_deleted' ),
 168                                 array( 'fa_name' => $this->title->getDBkey() ),
 169                                 __METHOD__,
 170                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 171                         $ret = $dbr->resultObject( $res );
 172                         return $ret;
 173                 }
 174                 return null;
 175         }
 176
 177         /**
 178          * Return a Revision object containing data for the deleted revision.
 179          * Note that the result *may* or *may not* have a null page ID.
 180          *
 181          * @param $timestamp String
 182          * @return Revision
 183          */
 184         function getRevision( $timestamp ) {
 185                 $dbr = wfGetDB( DB_SLAVE );
 186                 $row = $dbr->selectRow( 'archive',
 187                         array(
 188                                 'ar_rev_id',
 189                                 'ar_text',
 190                                 'ar_comment',
 191                                 'ar_user',
 192                                 'ar_user_text',
 193                                 'ar_timestamp',
 194                                 'ar_minor_edit',
 195                                 'ar_flags',
 196                                 'ar_text_id',
 197                                 'ar_deleted',
 198                                 'ar_len' ),
 199                         array( 'ar_namespace' => $this->title->getNamespace(),
 200                                    'ar_title' => $this->title->getDBkey(),
 201                                    'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 202                         __METHOD__ );
 203                 if( $row ) {
 204                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 205                 } else {
 206                         return null;
 207                 }
 208         }
 209
 210         /**
 211          * Return the most-previous revision, either live or deleted, against
 212          * the deleted revision given by timestamp.
 213          *
 214          * May produce unexpected results in case of history merges or other
 215          * unusual time issues.
 216          *
 217          * @param $timestamp String
 218          * @return Revision or null
 219          */
 220         function getPreviousRevision( $timestamp ) {
 221                 $dbr = wfGetDB( DB_SLAVE );
 222
 223                 // Check the previous deleted revision...
 224                 $row = $dbr->selectRow( 'archive',
 225                         'ar_timestamp',
 226                         array( 'ar_namespace' => $this->title->getNamespace(),
 227                                    'ar_title' => $this->title->getDBkey(),
 228                                    'ar_timestamp < ' .
 229                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 230                         __METHOD__,
 231                         array(
 232                                 'ORDER BY' => 'ar_timestamp DESC',
 233                                 'LIMIT' => 1 ) );
 234                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 235
 236                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 237                         array( 'rev_id', 'rev_timestamp' ),
 238                         array(
 239                                 'page_namespace' => $this->title->getNamespace(),
 240                                 'page_title' => $this->title->getDBkey(),
 241                                 'page_id = rev_page',
 242                                 'rev_timestamp < ' .
 243                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 244                         __METHOD__,
 245                         array(
 246                                 'ORDER BY' => 'rev_timestamp DESC',
 247                                 'LIMIT' => 1 ) );
 248                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 249                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 250
 251                 if( $prevLive && $prevLive > $prevDeleted ) {
 252                         // Most prior revision was live
 253                         return Revision::newFromId( $prevLiveId );
 254                 } elseif( $prevDeleted ) {
 255                         // Most prior revision was deleted
 256                         return $this->getRevision( $prevDeleted );
 257                 } else {
 258                         // No prior revision on this page.
 259                         return null;
 260                 }
 261         }
 262
 263         /**
 264          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 265          *
 266          * @param $row Object: database row
 267          * @return Revision
 268          */
 269         function getTextFromRow( $row ) {
 270                 if( is_null( $row->ar_text_id ) ) {
 271                         // An old row from MediaWiki 1.4 or previous.
 272                         // Text is embedded in this row in classic compression format.
 273                         return Revision::getRevisionText( $row, 'ar_' );
 274                 } else {
 275                         // New-style: keyed to the text storage backend.
 276                         $dbr = wfGetDB( DB_SLAVE );
 277                         $text = $dbr->selectRow( 'text',
 278                                 array( 'old_text', 'old_flags' ),
 279                                 array( 'old_id' => $row->ar_text_id ),
 280                                 __METHOD__ );
 281                         return Revision::getRevisionText( $text );
 282                 }
 283         }
 284
 285         /**
 286          * Fetch (and decompress if necessary) the stored text of the most
 287          * recently edited deleted revision of the page.
 288          *
 289          * If there are no archived revisions for the page, returns NULL.
 290          *
 291          * @return String
 292          */
 293         function getLastRevisionText() {
 294                 $dbr = wfGetDB( DB_SLAVE );
 295                 $row = $dbr->selectRow( 'archive',
 296                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 297                         array( 'ar_namespace' => $this->title->getNamespace(),
 298                                    'ar_title' => $this->title->getDBkey() ),
 299                         __METHOD__,
 300                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 301                 if( $row ) {
 302                         return $this->getTextFromRow( $row );
 303                 } else {
 304                         return null;
 305                 }
 306         }
 307
 308         /**
 309          * Quick check if any archived revisions are present for the page.
 310          *
 311          * @return Boolean
 312          */
 313         function isDeleted() {
 314                 $dbr = wfGetDB( DB_SLAVE );
 315                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 316                         array( 'ar_namespace' => $this->title->getNamespace(),
 317                                    'ar_title' => $this->title->getDBkey() ) );
 318                 return ( $n > 0 );
 319         }
 320
 321         /**
 322          * Restore the given (or all) text and file revisions for the page.
 323          * Once restored, the items will be removed from the archive tables.
 324          * The deletion log will be updated with an undeletion notice.
 325          *
 326          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 327          * @param $comment String
 328          * @param $fileVersions Array
 329          * @param $unsuppress Boolean
 330          *
 331          * @return array(number of file revisions restored, number of image revisions restored, log message)
 332          * on success, false on failure
 333          */
 334         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 335                 // If both the set of text revisions and file revisions are empty,
 336                 // restore everything. Otherwise, just restore the requested items.
 337                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 338
 339                 $restoreText = $restoreAll || !empty( $timestamps );
 340                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 341
 342                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 343                         $img = wfLocalFile( $this->title );
 344                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 345                         if ( !$this->fileStatus->isOk() ) {
 346                                 return false;
 347                         }
 348                         $filesRestored = $this->fileStatus->successCount;
 349                 } else {
 350                         $filesRestored = 0;
 351                 }
 352
 353                 if( $restoreText ) {
 354                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 355                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 356                                 return false;
 357                         }
 358                 } else {
 359                         $textRestored = 0;
 360                 }
 361
 362                 // Touch the log!
 363                 global $wgContLang;
 364                 $log = new LogPage( 'delete' );
 365
 366                 if( $textRestored && $filesRestored ) {
 367                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 368                                 $wgContLang->formatNum( $textRestored ),
 369                                 $wgContLang->formatNum( $filesRestored ) );
 370                 } elseif( $textRestored ) {
 371                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 372                                 $wgContLang->formatNum( $textRestored ) );
 373                 } elseif( $filesRestored ) {
 374                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 375                                 $wgContLang->formatNum( $filesRestored ) );
 376                 } else {
 377                         wfDebug( "Undelete: nothing undeleted...\n" );
 378                         return false;
 379                 }
 380
 381                 if( trim( $comment ) != '' ) {
 382                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 383                 }
 384                 $log->addEntry( 'restore', $this->title, $reason );
 385
 386                 return array( $textRestored, $filesRestored, $reason );
 387         }
 388
 389         /**
 390          * This is the meaty bit -- restores archived revisions of the given page
 391          * to the cur/old tables. If the page currently exists, all revisions will
 392          * be stuffed into old, otherwise the most recent will go into cur.
 393          *
 394          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 395          * @param $comment String
 396          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 397          *
 398          * @return Mixed: number of revisions restored or false on failure
 399          */
 400         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 401                 if ( wfReadOnly() ) {
 402                         return false;
 403                 }
 404                 $restoreAll = empty( $timestamps );
 405
 406                 $dbw = wfGetDB( DB_MASTER );
 407
 408                 # Does this page already exist? We'll have to update it...
 409                 $article = new Article( $this->title );
 410                 $options = 'FOR UPDATE'; // lock page
 411                 $page = $dbw->selectRow( 'page',
 412                         array( 'page_id', 'page_latest' ),
 413                         array( 'page_namespace' => $this->title->getNamespace(),
 414                                    'page_title'     => $this->title->getDBkey() ),
 415                         __METHOD__,
 416                         $options
 417                 );
 418                 if( $page ) {
 419                         $makepage = false;
 420                         # Page already exists. Import the history, and if necessary
 421                         # we'll update the latest revision field in the record.
 422                         $newid             = 0;
 423                         $pageId            = $page->page_id;
 424                         $previousRevId    = $page->page_latest;
 425                         # Get the time span of this page
 426                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 427                                 array( 'rev_id' => $previousRevId ),
 428                                 __METHOD__ );
 429                         if( $previousTimestamp === false ) {
 430                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 431                                 return 0;
 432                         }
 433                 } else {
 434                         # Have to create a new article...
 435                         $makepage = true;
 436                         $previousRevId = 0;
 437                         $previousTimestamp = 0;
 438                 }
 439
 440                 if( $restoreAll ) {
 441                         $oldones = '1 = 1'; # All revisions...
 442                 } else {
 443                         $oldts = implode( ',',
 444                                 array_map( array( &$dbw, 'addQuotes' ),
 445                                         array_map( array( &$dbw, 'timestamp' ),
 446                                                 $timestamps ) ) );
 447
 448                         $oldones = "ar_timestamp IN ( {$oldts} )";
 449                 }
 450
 451                 /**
 452                  * Select each archived revision...
 453                  */
 454                 $result = $dbw->select( 'archive',
 455                         /* fields */ array(
 456                                 'ar_rev_id',
 457                                 'ar_text',
 458                                 'ar_comment',
 459                                 'ar_user',
 460                                 'ar_user_text',
 461                                 'ar_timestamp',
 462                                 'ar_minor_edit',
 463                                 'ar_flags',
 464                                 'ar_text_id',
 465                                 'ar_deleted',
 466                                 'ar_page_id',
 467                                 'ar_len' ),
 468                         /* WHERE */ array(
 469                                 'ar_namespace' => $this->title->getNamespace(),
 470                                 'ar_title'     => $this->title->getDBkey(),
 471                                 $oldones ),
 472                         __METHOD__,
 473                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 474                 );
 475                 $ret = $dbw->resultObject( $result );
 476                 $rev_count = $dbw->numRows( $result );
 477                 if( !$rev_count ) {
 478                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 479                         return false; // ???
 480                 }
 481
 482                 $ret->seek( $rev_count - 1 ); // move to last
 483                 $row = $ret->fetchObject(); // get newest archived rev
 484                 $ret->seek( 0 ); // move back
 485
 486                 if( $makepage ) {
 487                         // Check the state of the newest to-be version...
 488                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 489                                 return false; // we can't leave the current revision like this!
 490                         }
 491                         // Safe to insert now...
 492                         $newid  = $article->insertOn( $dbw );
 493                         $pageId = $newid;
 494                 } else {
 495                         // Check if a deleted revision will become the current revision...
 496                         if( $row->ar_timestamp > $previousTimestamp ) {
 497                                 // Check the state of the newest to-be version...
 498                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 499                                         return false; // we can't leave the current revision like this!
 500                                 }
 501                         }
 502                 }
 503
 504                 $revision = null;
 505                 $restored = 0;
 506
 507                 foreach ( $ret as $row ) {
 508                         // Check for key dupes due to shitty archive integrity.
 509                         if( $row->ar_rev_id ) {
 510                                 $exists = $dbw->selectField( 'revision', '1',
 511                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 512                                 if( $exists ) {
 513                                         continue; // don't throw DB errors
 514                                 }
 515                         }
 516                         // Insert one revision at a time...maintaining deletion status
 517                         // unless we are specifically removing all restrictions...
 518                         $revision = Revision::newFromArchiveRow( $row,
 519                                 array(
 520                                         'page' => $pageId,
 521                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 522                                 ) );
 523
 524                         $revision->insertOn( $dbw );
 525                         $restored++;
 526
 527                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 528                 }
 529                 # Now that it's safely stored, take it out of the archive
 530                 $dbw->delete( 'archive',
 531                         /* WHERE */ array(
 532                                 'ar_namespace' => $this->title->getNamespace(),
 533                                 'ar_title' => $this->title->getDBkey(),
 534                                 $oldones ),
 535                         __METHOD__ );
 536
 537                 // Was anything restored at all?
 538                 if ( $restored == 0 ) {
 539                         return 0;
 540                 }
 541
 542                 $created = (bool)$newid;
 543                 $oldcountable = $article->isCountable();
 544
 545                 // Attach the latest revision to the page...
 546                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 547                 if ( $created || $wasnew ) {
 548                         // Update site stats, link tables, etc
 549                         $user = User::newFromName( $revision->getRawUserText(), false );
 550                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 551                 }
 552
 553                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 554
 555                 if( $this->title->getNamespace() == NS_FILE ) {
 556                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 557                         $update->doUpdate();
 558                 }
 559
 560                 return $restored;
 561         }
 562
 563         /**
 564          * @return Status
 565          */
 566         function getFileStatus() { return $this->fileStatus; }
 567 }
 568
 569 /**
 570  * Special page allowing users with the appropriate permissions to view
 571  * and restore deleted content.
 572  *
 573  * @ingroup SpecialPage
 574  */
 575 class SpecialUndelete extends SpecialPage {
 576         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 577         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 578
 579         /**
 580          * @var Title
 581          */
 582         var $mTargetObj;
 583
 584         function __construct( $request = null ) {
 585                 parent::__construct( 'Undelete', 'deletedhistory' );
 586
 587                 if ( $request === null ) {
 588                         global $wgRequest;
 589                         $this->mRequest = $wgRequest;
 590                 } else {
 591                         $this->mRequest = $request;
 592                 }
 593         }
 594
 595         function loadRequest() {
 596                 global $wgUser;
 597                 $this->mAction = $this->mRequest->getVal( 'action' );
 598                 $this->mTarget = $this->mRequest->getVal( 'target' );
 599                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 600                 $time = $this->mRequest->getVal( 'timestamp' );
 601                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 602                 $this->mFilename = $this->mRequest->getVal( 'file' );
 603
 604                 $posted = $this->mRequest->wasPosted() &&
 605                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 606                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 607                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 608                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 609                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 610                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 611                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 612                 $this->mToken = $this->mRequest->getVal( 'token' );
 613
 614                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 615                         $this->mAllowed = true; // user can restore
 616                         $this->mCanView = true; // user can view content
 617                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 618                         $this->mAllowed = false; // user cannot restore
 619                         $this->mCanView = true; // user can view content
 620                 } else { // user can only view the list of revisions
 621                         $this->mAllowed = false;
 622                         $this->mCanView = false;
 623                         $this->mTimestamp = '';
 624                         $this->mRestore = false;
 625                 }
 626
 627                 if( $this->mRestore || $this->mInvert ) {
 628                         $timestamps = array();
 629                         $this->mFileVersions = array();
 630                         foreach( $this->mRequest->getValues() as $key => $val ) {
 631                                 $matches = array();
 632                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 633                                         array_push( $timestamps, $matches[1] );
 634                                 }
 635
 636                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 637                                         $this->mFileVersions[] = intval( $matches[1] );
 638                                 }
 639                         }
 640                         rsort( $timestamps );
 641                         $this->mTargetTimestamp = $timestamps;
 642                 }
 643         }
 644
 645         function execute( $par ) {
 646                 global $wgOut, $wgUser;
 647
 648                 $this->setHeaders();
 649                 if ( !$this->userCanExecute( $wgUser ) ) {
 650                         $this->displayRestrictionError();
 651                         return;
 652                 }
 653                 $this->outputHeader();
 654
 655                 $this->loadRequest();
 656
 657                 if ( $this->mAllowed ) {
 658                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 659                 } else {
 660                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
 661                 }
 662
 663                 if( $par != '' ) {
 664                         $this->mTarget = $par;
 665                 }
 666                 if ( $this->mTarget !== '' ) {
 667                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 668                         $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 669                 } else {
 670                         $this->mTargetObj = null;
 671                 }
 672
 673                 if( is_null( $this->mTargetObj ) ) {
 674                         # Not all users can just browse every deleted page from the list
 675                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 676                                 $this->showSearchForm();
 677
 678                                 # List undeletable articles
 679                                 if( $this->mSearchPrefix ) {
 680                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 681                                         $this->showList( $result );
 682                                 }
 683                         } else {
 684                                 $wgOut->addWikiMsg( 'undelete-header' );
 685                         }
 686                         return;
 687                 }
 688                 if( $this->mTimestamp !== '' ) {
 689                         return $this->showRevision( $this->mTimestamp );
 690                 }
 691                 if( $this->mFilename !== null ) {
 692                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 693                         // Check if user is allowed to see this file
 694                         if ( !$file->exists() ) {
 695                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 696                                 return;
 697                         } elseif( !$file->userCan( File::DELETED_FILE ) ) {
 698                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 699                                         $wgOut->permissionRequired( 'suppressrevision' );
 700                                 } else {
 701                                         $wgOut->permissionRequired( 'deletedtext' );
 702                                 }
 703                                 return false;
 704                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFilename ) ) {
 705                                 $this->showFileConfirmationForm( $this->mFilename );
 706                                 return false;
 707                         } else {
 708                                 return $this->showFile( $this->mFilename );
 709                         }
 710                 }
 711                 if( $this->mRestore && $this->mAction == 'submit' ) {
 712                         global $wgUploadMaintenance;
 713                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 714                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 715                                 return;
 716                         }
 717                         return $this->undelete();
 718                 }
 719                 if( $this->mInvert && $this->mAction == 'submit' ) {
 720                         return $this->showHistory();
 721                 }
 722                 return $this->showHistory();
 723         }
 724
 725         function showSearchForm() {
 726                 global $wgOut, $wgScript;
 727                 $wgOut->addWikiMsg( 'undelete-header' );
 728
 729                 $wgOut->addHTML(
 730                         Xml::openElement( 'form', array(
 731                                 'method' => 'get',
 732                                 'action' => $wgScript ) ) .
 733                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 734                         Html::hidden( 'title',
 735                                 $this->getTitle()->getPrefixedDbKey() ) .
 736                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 737                                 'prefix', 'prefix', 20,
 738                                 $this->mSearchPrefix ) . ' ' .
 739                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 740                         Xml::closeElement( 'fieldset' ) .
 741                         Xml::closeElement( 'form' )
 742                 );
 743         }
 744
 745         /**
 746          * Generic list of deleted pages
 747          *
 748          * @param $result ResultWrapper
 749          * @return bool
 750          */
 751         private function showList( $result ) {
 752                 global $wgLang, $wgOut;
 753
 754                 if( $result->numRows() == 0 ) {
 755                         $wgOut->addWikiMsg( 'undelete-no-results' );
 756                         return;
 757                 }
 758
 759                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 760
 761                 $sk = $this->getSkin();
 762                 $undelete = $this->getTitle();
 763                 $wgOut->addHTML( "<ul>\n" );
 764                 foreach ( $result as $row ) {
 765                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 766                         $link = $sk->linkKnown(
 767                                 $undelete,
 768                                 htmlspecialchars( $title->getPrefixedText() ),
 769                                 array(),
 770                                 array( 'target' => $title->getPrefixedText() )
 771                         );
 772                         $revs = wfMsgExt( 'undeleterevisions',
 773                                 array( 'parseinline' ),
 774                                 $wgLang->formatNum( $row->count ) );
 775                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 776                 }
 777                 $result->free();
 778                 $wgOut->addHTML( "</ul>\n" );
 779
 780                 return true;
 781         }
 782
 783         private function showRevision( $timestamp ) {
 784                 global $wgLang, $wgUser, $wgOut;
 785
 786                 $skin = $this->getSkin();
 787
 788                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 789                         return 0;
 790                 }
 791
 792                 $archive = new PageArchive( $this->mTargetObj );
 793                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 794                 $rev = $archive->getRevision( $timestamp );
 795
 796                 if( !$rev ) {
 797                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 798                         return;
 799                 }
 800
 801                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 802                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 803                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 804                                 return;
 805                         } else {
 806                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 807                                 $wgOut->addHTML( '<br />' );
 808                                 // and we are allowed to see...
 809                         }
 810                 }
 811
 812                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 813
 814                 $link = $skin->linkKnown(
 815                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 816                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 817                 );
 818
 819                 if( $this->mDiff ) {
 820                         $previousRev = $archive->getPreviousRevision( $timestamp );
 821                         if( $previousRev ) {
 822                                 $this->showDiff( $previousRev, $rev );
 823                                 if( $wgUser->getOption( 'diffonly' ) ) {
 824                                         return;
 825                                 } else {
 826                                         $wgOut->addHTML( '<hr />' );
 827                                 }
 828                         } else {
 829                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 830                         }
 831                 }
 832
 833                 // date and time are separate parameters to facilitate localisation.
 834                 // $time is kept for backward compat reasons.
 835                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 836                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 837                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 838                 $user = $skin->revUserTools( $rev );
 839
 840                 if( $this->mPreview ) {
 841                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 842                 } else {
 843                         $openDiv = '<div id="mw-undelete-revision">';
 844                 }
 845                 $wgOut->addHTML( $openDiv );
 846
 847                 // Revision delete links
 848                 if ( !$this->mDiff ) {
 849                         $revdel = $this->revDeleteLink( $rev );
 850                         if ( $revdel ) {
 851                                 $wgOut->addHTML( $revdel );
 852                         }
 853                 }
 854
 855                 $wgOut->addWikiMsgArray( 'undelete-revision', array( $link, $time, $user, $d, $t ), array( 'replaceafter' ) );
 856                 $wgOut->addHTML( '</div>' );
 857                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 858
 859                 if( $this->mPreview ) {
 860                         // Hide [edit]s
 861                         $popts = $wgOut->parserOptions();
 862                         $popts->setEditSection( false );
 863                         $wgOut->parserOptions( $popts );
 864                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 865                 }
 866
 867                 $wgOut->addHTML(
 868                         Xml::element( 'textarea', array(
 869                                         'readonly' => 'readonly',
 870                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 871                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 872                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 873                         Xml::openElement( 'div' ) .
 874                         Xml::openElement( 'form', array(
 875                                 'method' => 'post',
 876                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 877                         Xml::element( 'input', array(
 878                                 'type' => 'hidden',
 879                                 'name' => 'target',
 880                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 881                         Xml::element( 'input', array(
 882                                 'type' => 'hidden',
 883                                 'name' => 'timestamp',
 884                                 'value' => $timestamp ) ) .
 885                         Xml::element( 'input', array(
 886                                 'type' => 'hidden',
 887                                 'name' => 'wpEditToken',
 888                                 'value' => $wgUser->editToken() ) ) .
 889                         Xml::element( 'input', array(
 890                                 'type' => 'submit',
 891                                 'name' => 'preview',
 892                                 'value' => wfMsg( 'showpreview' ) ) ) .
 893                         Xml::element( 'input', array(
 894                                 'name' => 'diff',
 895                                 'type' => 'submit',
 896                                 'value' => wfMsg( 'showdiff' ) ) ) .
 897                         Xml::closeElement( 'form' ) .
 898                         Xml::closeElement( 'div' ) );
 899         }
 900
 901         /**
 902          * Get a revision-deletion link, or disabled link, or nothing, depending
 903          * on user permissions & the settings on the revision.
 904          *
 905          * Will use forward-compatible revision ID in the Special:RevDelete link
 906          * if possible, otherwise the timestamp-based ID which may break after
 907          * undeletion.
 908          *
 909          * @param Revision $rev
 910          * @return string HTML fragment
 911          */
 912         function revDeleteLink( $rev ) {
 913                 global $wgUser;
 914                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 915                 if( $canHide || ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
 916                         $skin = $this->getSkin();
 917                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 918                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 919                         } else {
 920                                 if ( $rev->getId() ) {
 921                                         // RevDelete links using revision ID are stable across
 922                                         // page deletion and undeletion; use when possible.
 923                                         $query = array(
 924                                                 'type'   => 'revision',
 925                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 926                                                 'ids'    => $rev->getId()
 927                                         );
 928                                 } else {
 929                                         // Older deleted entries didn't save a revision ID.
 930                                         // We have to refer to these by timestamp, ick!
 931                                         $query = array(
 932                                                 'type'   => 'archive',
 933                                                 'target' => $this->mTargetObj->getPrefixedDBkey(),
 934                                                 'ids'    => $rev->getTimestamp()
 935                                         );
 936                                 }
 937                                 return $skin->revDeleteLink( $query,
 938                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 939                         }
 940                 } else {
 941                         return '';
 942                 }
 943         }
 944
 945         /**
 946          * Build a diff display between this and the previous either deleted
 947          * or non-deleted edit.
 948          *
 949          * @param $previousRev Revision
 950          * @param $currentRev Revision
 951          * @return String: HTML
 952          */
 953         function showDiff( $previousRev, $currentRev ) {
 954                 global $wgOut;
 955
 956                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 957                 $diffEngine->showDiffStyle();
 958                 $wgOut->addHTML(
 959                         "<div>" .
 960                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 961                         "<col class='diff-marker' />" .
 962                         "<col class='diff-content' />" .
 963                         "<col class='diff-marker' />" .
 964                         "<col class='diff-content' />" .
 965                         "<tr>" .
 966                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 967                                 $this->diffHeader( $previousRev, 'o' ) .
 968                                 "</td>\n" .
 969                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 970                                 $this->diffHeader( $currentRev, 'n' ) .
 971                                 "</td>\n" .
 972                         "</tr>" .
 973                         $diffEngine->generateDiffBody(
 974                                 $previousRev->getText(), $currentRev->getText() ) .
 975                         "</table>" .
 976                         "</div>\n"
 977                 );
 978         }
 979
 980         /**
 981          * @param $rev Revision
 982          * @param $prefix
 983          * @return string
 984          */
 985         private function diffHeader( $rev, $prefix ) {
 986                 global $wgUser, $wgLang;
 987                 $sk = $this->getSkin();
 988                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 989                 if( $isDeleted ) {
 990                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 991                         $targetPage = $this->getTitle();
 992                         $targetQuery = array(
 993                                 'target' => $this->mTargetObj->getPrefixedText(),
 994                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 995                         );
 996                 } else {
 997                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 998                         $targetPage = $rev->getTitle();
 999                         $targetQuery = array( 'oldid' => $rev->getId() );
1000                 }
1001                 // Add show/hide deletion links if available
1002                 $del = $this->revDeleteLink( $rev );
1003                 return
1004                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
1005                                 $sk->link(
1006                                         $targetPage,
1007                                         wfMsgHtml(
1008                                                 'revisionasof',
1009                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
1010                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
1011                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
1012                                         ),
1013                                         array(),
1014                                         $targetQuery
1015                                 ) .
1016                         '</strong></div>' .
1017                         '<div id="mw-diff-'.$prefix.'title2">' .
1018                                 $sk->revUserTools( $rev ) . '<br />' .
1019                         '</div>' .
1020                         '<div id="mw-diff-'.$prefix.'title3">' .
1021                                 $sk->revComment( $rev ) . $del . '<br />' .
1022                         '</div>';
1023         }
1024
1025         /**
1026          * Show a form confirming whether a tokenless user really wants to see a file
1027          */
1028         private function showFileConfirmationForm( $key ) {
1029                 global $wgOut, $wgUser, $wgLang;
1030                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
1031                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
1032                         $this->mTargetObj->getText(),
1033                         $wgLang->date( $file->getTimestamp() ),
1034                         $wgLang->time( $file->getTimestamp() ) );
1035                 $wgOut->addHTML(
1036                         Xml::openElement( 'form', array(
1037                                 'method' => 'POST',
1038                                 'action' => $this->getTitle()->getLocalURL(
1039                                         'target=' . urlencode( $this->mTarget ) .
1040                                         '&file=' . urlencode( $key ) .
1041                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
1042                                 )
1043                         ) .
1044                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
1045                         '</form>'
1046                 );
1047         }
1048
1049         /**
1050          * Show a deleted file version requested by the visitor.
1051          */
1052         private function showFile( $key ) {
1053                 global $wgOut, $wgRequest;
1054                 $wgOut->disable();
1055
1056                 # We mustn't allow the output to be Squid cached, otherwise
1057                 # if an admin previews a deleted image, and it's cached, then
1058                 # a user without appropriate permissions can toddle off and
1059                 # nab the image, and Squid will serve it
1060                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1061                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1062                 $wgRequest->response()->header( 'Pragma: no-cache' );
1063
1064                 global $IP;
1065                 require_once( "$IP/includes/StreamFile.php" );
1066                 $repo = RepoGroup::singleton()->getLocalRepo();
1067                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1068                 wfStreamFile( $path );
1069         }
1070
1071         private function showHistory() {
1072                 global $wgUser, $wgOut;
1073
1074                 $sk = $wgUser->getSkin();
1075                 if( $this->mAllowed ) {
1076                         $wgOut->addModules( 'mediawiki.special.undelete' );
1077                         $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
1078                 } else {
1079                         $wgOut->setPageTitle( wfMsg( 'viewdeletedpage' ) );
1080                 }
1081                 $wgOut->wrapWikiMsg(
1082                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1083                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1084                 );
1085
1086                 $archive = new PageArchive( $this->mTargetObj );
1087                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1088                 /*
1089                 $text = $archive->getLastRevisionText();
1090                 if( is_null( $text ) ) {
1091                         $wgOut->addWikiMsg( 'nohistory' );
1092                         return;
1093                 }
1094                 */
1095                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1096                 if ( $this->mAllowed ) {
1097                         $wgOut->addWikiMsg( 'undeletehistory' );
1098                         $wgOut->addWikiMsg( 'undeleterevdel' );
1099                 } else {
1100                         $wgOut->addWikiMsg( 'undeletehistorynoadmin' );
1101                 }
1102                 $wgOut->addHTML( '</div>' );
1103
1104                 # List all stored revisions
1105                 $revisions = $archive->listRevisions();
1106                 $files = $archive->listFiles();
1107
1108                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1109                 $haveFiles = $files && $files->numRows() > 0;
1110
1111                 # Batch existence check on user and talk pages
1112                 if( $haveRevisions ) {
1113                         $batch = new LinkBatch();
1114                         foreach ( $revisions as $row ) {
1115                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1116                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1117                         }
1118                         $batch->execute();
1119                         $revisions->seek( 0 );
1120                 }
1121                 if( $haveFiles ) {
1122                         $batch = new LinkBatch();
1123                         foreach ( $files as $row ) {
1124                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1125                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1126                         }
1127                         $batch->execute();
1128                         $files->seek( 0 );
1129                 }
1130
1131                 if ( $this->mAllowed ) {
1132                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1133                         # Start the form here
1134                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1135                         $wgOut->addHTML( $top );
1136                 }
1137
1138                 # Show relevant lines from the deletion log:
1139                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1140                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1141                 # Show relevant lines from the suppression log:
1142                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1143                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1144                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1145                 }
1146
1147                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1148                         # Format the user-visible controls (comment field, submission button)
1149                         # in a nice little table
1150                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1151                                 $unsuppressBox =
1152                                         "<tr>
1153                                                 <td>&#160;</td>
1154                                                 <td class='mw-input'>" .
1155                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1156                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1157                                                 "</td>
1158                                         </tr>";
1159                         } else {
1160                                 $unsuppressBox = '';
1161                         }
1162                         $table =
1163                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1164                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1165                                         "<tr>
1166                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1167                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1168                                                 "</td>
1169                                         </tr>
1170                                         <tr>
1171                                                 <td class='mw-label'>" .
1172                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1173                                                 "</td>
1174                                                 <td class='mw-input'>" .
1175                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1176                                                 "</td>
1177                                         </tr>
1178                                         <tr>
1179                                                 <td>&#160;</td>
1180                                                 <td class='mw-submit'>" .
1181                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1182                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1183                                                 "</td>
1184                                         </tr>" .
1185                                         $unsuppressBox .
1186                                 Xml::closeElement( 'table' ) .
1187                                 Xml::closeElement( 'fieldset' );
1188
1189                         $wgOut->addHTML( $table );
1190                 }
1191
1192                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1193
1194                 if( $haveRevisions ) {
1195                         # The page's stored (deleted) history:
1196                         $wgOut->addHTML( '<ul>' );
1197                         $remaining = $revisions->numRows();
1198                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1199
1200                         foreach ( $revisions as $row ) {
1201                                 $remaining--;
1202                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1203                         }
1204                         $revisions->free();
1205                         $wgOut->addHTML( '</ul>' );
1206                 } else {
1207                         $wgOut->addWikiMsg( 'nohistory' );
1208                 }
1209
1210                 if( $haveFiles ) {
1211                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1212                         $wgOut->addHTML( '<ul>' );
1213                         foreach ( $files as $row ) {
1214                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1215                         }
1216                         $files->free();
1217                         $wgOut->addHTML( '</ul>' );
1218                 }
1219
1220                 if ( $this->mAllowed ) {
1221                         # Slip in the hidden controls here
1222                         $misc  = Html::hidden( 'target', $this->mTarget );
1223                         $misc .= Html::hidden( 'wpEditToken', $wgUser->editToken() );
1224                         $misc .= Xml::closeElement( 'form' );
1225                         $wgOut->addHTML( $misc );
1226                 }
1227
1228                 return true;
1229         }
1230
1231         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1232                 global $wgLang;
1233
1234                 $rev = Revision::newFromArchiveRow( $row,
1235                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1236                 $stxt = '';
1237                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1238                 // Build checkboxen...
1239                 if( $this->mAllowed ) {
1240                         if( $this->mInvert ) {
1241                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1242                                         $checkBox = Xml::check( "ts$ts" );
1243                                 } else {
1244                                         $checkBox = Xml::check( "ts$ts", true );
1245                                 }
1246                         } else {
1247                                 $checkBox = Xml::check( "ts$ts" );
1248                         }
1249                 } else {
1250                         $checkBox = '';
1251                 }
1252                 // Build page & diff links...
1253                 if( $this->mCanView ) {
1254                         $titleObj = $this->getTitle();
1255                         # Last link
1256                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1257                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1258                                 $last = wfMsgHtml( 'diff' );
1259                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1260                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1261                                 $last = $sk->linkKnown(
1262                                         $titleObj,
1263                                         wfMsgHtml( 'diff' ),
1264                                         array(),
1265                                         array(
1266                                                 'target' => $this->mTargetObj->getPrefixedText(),
1267                                                 'timestamp' => $ts,
1268                                                 'diff' => 'prev'
1269                                         )
1270                                 );
1271                         } else {
1272                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1273                                 $last = wfMsgHtml( 'diff' );
1274                         }
1275                 } else {
1276                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1277                         $last = wfMsgHtml( 'diff' );
1278                 }
1279                 // User links
1280                 $userLink = $sk->revUserTools( $rev );
1281                 // Revision text size
1282                 $size = $row->ar_len;
1283                 if( !is_null( $size ) ) {
1284                         $stxt = $sk->formatRevisionSize( $size );
1285                 }
1286                 // Edit summary
1287                 $comment = $sk->revComment( $rev );
1288                 // Revision delete links
1289                 $revdlink = $this->revDeleteLink( $rev );
1290                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1291         }
1292
1293         private function formatFileRow( $row, $sk ) {
1294                 global $wgUser, $wgLang;
1295
1296                 $file = ArchivedFile::newFromRow( $row );
1297
1298                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1299                 if( $this->mAllowed && $row->fa_storage_key ) {
1300                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1301                         $key = urlencode( $row->fa_storage_key );
1302                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1303                 } else {
1304                         $checkBox = '';
1305                         $pageLink = $wgLang->timeanddate( $ts, true );
1306                 }
1307                 $userLink = $this->getFileUser( $file, $sk );
1308                 $data =
1309                         wfMsg( 'widthheight',
1310                                 $wgLang->formatNum( $row->fa_width ),
1311                                 $wgLang->formatNum( $row->fa_height ) ) .
1312                         ' (' .
1313                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1314                         ')';
1315                 $data = htmlspecialchars( $data );
1316                 $comment = $this->getFileComment( $file, $sk );
1317                 // Add show/hide deletion links if available
1318                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1319                 if( $canHide || ( $file->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1320                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1321                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1322                         } else {
1323                                 $query = array(
1324                                         'type' => 'filearchive',
1325                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1326                                         'ids' => $row->fa_id
1327                                 );
1328                                 $revdlink = $sk->revDeleteLink( $query,
1329                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1330                         }
1331                 } else {
1332                         $revdlink = '';
1333                 }
1334                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1335         }
1336
1337         /**
1338          * Fetch revision text link if it's available to all users
1339          *
1340          * @param $rev Revision
1341          * @param $sk Skin
1342          * @return string
1343          */
1344         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1345                 global $wgLang;
1346
1347                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1348
1349                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1350                         return '<span class="history-deleted">' . $time . '</span>';
1351                 } else {
1352                         $link = $sk->linkKnown(
1353                                 $titleObj,
1354                                 $time,
1355                                 array(),
1356                                 array(
1357                                         'target' => $this->mTargetObj->getPrefixedText(),
1358                                         'timestamp' => $ts
1359                                 )
1360                         );
1361                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1362                                 $link = '<span class="history-deleted">' . $link . '</span>';
1363                         }
1364                         return $link;
1365                 }
1366         }
1367
1368         /**
1369          * Fetch image view link if it's available to all users
1370          *
1371          * @param $file File
1372          * @param $sk Skin
1373          * @return String: HTML fragment
1374          */
1375         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1376                 global $wgLang, $wgUser;
1377
1378                 if( !$file->userCan( File::DELETED_FILE ) ) {
1379                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1380                 } else {
1381                         $link = $sk->linkKnown(
1382                                 $titleObj,
1383                                 $wgLang->timeanddate( $ts, true ),
1384                                 array(),
1385                                 array(
1386                                         'target' => $this->mTargetObj->getPrefixedText(),
1387                                         'file' => $key,
1388                                         'token' => $wgUser->editToken( $key )
1389                                 )
1390                         );
1391                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1392                                 $link = '<span class="history-deleted">' . $link . '</span>';
1393                         }
1394                         return $link;
1395                 }
1396         }
1397
1398         /**
1399          * Fetch file's user id if it's available to this user
1400          *
1401          * @param $file File
1402          * @param $sk Skin
1403          * @return String: HTML fragment
1404          */
1405         function getFileUser( $file, $sk ) {
1406                 if( !$file->userCan( File::DELETED_USER ) ) {
1407                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1408                 } else {
1409                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1410                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1411                         if( $file->isDeleted( File::DELETED_USER ) ) {
1412                                 $link = '<span class="history-deleted">' . $link . '</span>';
1413                         }
1414                         return $link;
1415                 }
1416         }
1417
1418         /**
1419          * Fetch file upload comment if it's available to this user
1420          *
1421          * @param $file File
1422          * @param $sk Skin
1423          * @return String: HTML fragment
1424          */
1425         function getFileComment( $file, $sk ) {
1426                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1427                         return '<span class="history-deleted"><span class="comment">' .
1428                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1429                 } else {
1430                         $link = $sk->commentBlock( $file->getRawDescription() );
1431                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1432                                 $link = '<span class="history-deleted">' . $link . '</span>';
1433                         }
1434                         return $link;
1435                 }
1436         }
1437
1438         function undelete() {
1439                 global $wgOut, $wgUser;
1440                 if ( wfReadOnly() ) {
1441                         $wgOut->readOnlyPage();
1442                         return;
1443                 }
1444                 if( !is_null( $this->mTargetObj ) ) {
1445                         $archive = new PageArchive( $this->mTargetObj );
1446                         wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1447                         $ok = $archive->undelete(
1448                                 $this->mTargetTimestamp,
1449                                 $this->mComment,
1450                                 $this->mFileVersions,
1451                                 $this->mUnsuppress );
1452
1453                         if( is_array( $ok ) ) {
1454                                 if ( $ok[1] ) { // Undeleted file count
1455                                         wfRunHooks( 'FileUndeleteComplete', array(
1456                                                 $this->mTargetObj, $this->mFileVersions,
1457                                                 $wgUser, $this->mComment ) );
1458                                 }
1459
1460                                 $skin = $wgUser->getSkin();
1461                                 $link = $skin->linkKnown( $this->mTargetObj );
1462                                 $wgOut->addWikiMsgArray( 'undeletedpage', array( $link ), array( 'replaceafter' ) );
1463                         } else {
1464                                 $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1465                                 $wgOut->addWikiMsg( 'undeleterevdel' );
1466                         }
1467
1468                         // Show file deletion warnings and errors
1469                         $status = $archive->getFileStatus();
1470                         if( $status && !$status->isGood() ) {
1471                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1472                         }
1473                 } else {
1474                         $wgOut->showFatalError( wfMsg( 'cannotundelete' ) );
1475                 }
1476                 return false;
1477         }
1478 }