includes/SpecialUndelete.php

   1 <?php
   2
   3 /**
   4  * Special page allowing users with the appropriate permissions to view
   5  * and restore deleted content
   6  *
   7  * @addtogroup Special pages
   8  */
   9
  10 /**
  11  *
  12  */
  13 function wfSpecialUndelete( $par ) {
  14     global $wgRequest;
  15
  16         $form = new UndeleteForm( $wgRequest, $par );
  17         $form->execute();
  18 }
  19
  20 /**
  21  *
  22  * @addtogroup SpecialPage
  23  */
  24 class PageArchive {
  25         protected $title;
  26
  27         function __construct( $title ) {
  28                 if( is_null( $title ) ) {
  29                         throw new MWException( 'Archiver() given a null title.');
  30                 }
  31                 $this->title = $title;
  32         }
  33
  34         /**
  35          * List all deleted pages recorded in the archive table. Returns result
  36          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  37          * namespace/title.
  38          *
  39          * @return ResultWrapper
  40          */
  41         public static function listAllPages() {
  42                 $dbr = wfGetDB( DB_SLAVE );
  43                 return self::listPages( $dbr, '' );
  44         }
  45
  46         /**
  47          * List deleted pages recorded in the archive table matching the
  48          * given title prefix.
  49          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  50          *
  51          * @return ResultWrapper
  52          */
  53         public static function listPagesByPrefix( $prefix ) {
  54                 $dbr = wfGetDB( DB_SLAVE );
  55
  56                 $title = Title::newFromText( $prefix );
  57                 if( $title ) {
  58                         $ns = $title->getNamespace();
  59                         $encPrefix = $dbr->escapeLike( $title->getDbKey() );
  60                 } else {
  61                         // Prolly won't work too good
  62                         // @todo handle bare namespace names cleanly?
  63                         $ns = 0;
  64                         $encPrefix = $dbr->escapeLike( $prefix );
  65                 }
  66                 $conds = array(
  67                         'ar_namespace' => $ns,
  68                         "ar_title LIKE '$encPrefix%'",
  69                 );
  70                 return self::listPages( $dbr, $conds );
  71         }
  72
  73         protected static function listPages( $dbr, $condition ) {
  74                 return $dbr->resultObject(
  75                         $dbr->select(
  76                                 array( 'archive' ),
  77                                 array(
  78                                         'ar_namespace',
  79                                         'ar_title',
  80                                         'COUNT(*) AS count',
  81                                 ),
  82                                 $condition,
  83                                 __METHOD__,
  84                                 array(
  85                                         'GROUP BY' => 'ar_namespace,ar_title',
  86                                         'ORDER BY' => 'ar_namespace,ar_title',
  87                                         'LIMIT' => 100,
  88                                 )
  89                         )
  90                 );
  91         }
  92
  93         /**
  94          * List the revisions of the given page. Returns result wrapper with
  95          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
  96          *
  97          * @return ResultWrapper
  98          */
  99         function listRevisions() {
 100                 $dbr = wfGetDB( DB_SLAVE );
 101                 $res = $dbr->select( 'archive',
 102                         array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment' ),
 103                         array( 'ar_namespace' => $this->title->getNamespace(),
 104                                'ar_title' => $this->title->getDBkey() ),
 105                         'PageArchive::listRevisions',
 106                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 107                 $ret = $dbr->resultObject( $res );
 108                 return $ret;
 109         }
 110
 111         /**
 112          * List the deleted file revisions for this page, if it's a file page.
 113          * Returns a result wrapper with various filearchive fields, or null
 114          * if not a file page.
 115          *
 116          * @return ResultWrapper
 117          * @fixme Does this belong in Image for fuller encapsulation?
 118          */
 119         function listFiles() {
 120                 if( $this->title->getNamespace() == NS_IMAGE ) {
 121                         $dbr = wfGetDB( DB_SLAVE );
 122                         $res = $dbr->select( 'filearchive',
 123                                 array(
 124                                         'fa_id',
 125                                         'fa_name',
 126                                         'fa_storage_key',
 127                                         'fa_size',
 128                                         'fa_width',
 129                                         'fa_height',
 130                                         'fa_description',
 131                                         'fa_user',
 132                                         'fa_user_text',
 133                                         'fa_timestamp' ),
 134                                 array( 'fa_name' => $this->title->getDbKey() ),
 135                                 __METHOD__,
 136                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 137                         $ret = $dbr->resultObject( $res );
 138                         return $ret;
 139                 }
 140                 return null;
 141         }
 142
 143         /**
 144          * Fetch (and decompress if necessary) the stored text for the deleted
 145          * revision of the page with the given timestamp.
 146          *
 147          * @return string
 148          * @deprecated Use getRevision() for more flexible information
 149          */
 150         function getRevisionText( $timestamp ) {
 151                 $rev = $this->getRevision( $timestamp );
 152                 return $rev ? $rev->getText() : null;
 153         }
 154
 155         /**
 156          * Return a Revision object containing data for the deleted revision.
 157          * Note that the result *may* or *may not* have a null page ID.
 158          * @param string $timestamp
 159          * @return Revision
 160          */
 161         function getRevision( $timestamp ) {
 162                 $dbr = wfGetDB( DB_SLAVE );
 163                 $row = $dbr->selectRow( 'archive',
 164                         array(
 165                                 'ar_rev_id',
 166                                 'ar_text',
 167                                 'ar_comment',
 168                                 'ar_user',
 169                                 'ar_user_text',
 170                                 'ar_timestamp',
 171                                 'ar_minor_edit',
 172                                 'ar_flags',
 173                                 'ar_text_id' ),
 174                         array( 'ar_namespace' => $this->title->getNamespace(),
 175                                'ar_title' => $this->title->getDbkey(),
 176                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 177                         __METHOD__ );
 178                 if( $row ) {
 179                         return new Revision( array(
 180                                 'page'       => $this->title->getArticleId(),
 181                                 'id'         => $row->ar_rev_id,
 182                                 'text'       => ($row->ar_text_id
 183                                         ? null
 184                                         : Revision::getRevisionText( $row, 'ar_' ) ),
 185                                 'comment'    => $row->ar_comment,
 186                                 'user'       => $row->ar_user,
 187                                 'user_text'  => $row->ar_user_text,
 188                                 'timestamp'  => $row->ar_timestamp,
 189                                 'minor_edit' => $row->ar_minor_edit,
 190                                 'text_id'    => $row->ar_text_id ) );
 191                 } else {
 192                         return null;
 193                 }
 194         }
 195
 196         /**
 197          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 198          */
 199         function getTextFromRow( $row ) {
 200                 if( is_null( $row->ar_text_id ) ) {
 201                         // An old row from MediaWiki 1.4 or previous.
 202                         // Text is embedded in this row in classic compression format.
 203                         return Revision::getRevisionText( $row, "ar_" );
 204                 } else {
 205                         // New-style: keyed to the text storage backend.
 206                         $dbr = wfGetDB( DB_SLAVE );
 207                         $text = $dbr->selectRow( 'text',
 208                                 array( 'old_text', 'old_flags' ),
 209                                 array( 'old_id' => $row->ar_text_id ),
 210                                 __METHOD__ );
 211                         return Revision::getRevisionText( $text );
 212                 }
 213         }
 214
 215
 216         /**
 217          * Fetch (and decompress if necessary) the stored text of the most
 218          * recently edited deleted revision of the page.
 219          *
 220          * If there are no archived revisions for the page, returns NULL.
 221          *
 222          * @return string
 223          */
 224         function getLastRevisionText() {
 225                 $dbr = wfGetDB( DB_SLAVE );
 226                 $row = $dbr->selectRow( 'archive',
 227                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 228                         array( 'ar_namespace' => $this->title->getNamespace(),
 229                                'ar_title' => $this->title->getDBkey() ),
 230                         'PageArchive::getLastRevisionText',
 231                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 232                 if( $row ) {
 233                         return $this->getTextFromRow( $row );
 234                 } else {
 235                         return NULL;
 236                 }
 237         }
 238
 239         /**
 240          * Quick check if any archived revisions are present for the page.
 241          * @return bool
 242          */
 243         function isDeleted() {
 244                 $dbr = wfGetDB( DB_SLAVE );
 245                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 246                         array( 'ar_namespace' => $this->title->getNamespace(),
 247                                'ar_title' => $this->title->getDBkey() ) );
 248                 return ($n > 0);
 249         }
 250
 251         /**
 252          * Restore the given (or all) text and file revisions for the page.
 253          * Once restored, the items will be removed from the archive tables.
 254          * The deletion log will be updated with an undeletion notice.
 255          *
 256          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 257          * @param string $comment
 258          * @param array $fileVersions
 259          *
 260          * @return true on success.
 261          */
 262         function undelete( $timestamps, $comment = '', $fileVersions = array() ) {
 263                 // If both the set of text revisions and file revisions are empty,
 264                 // restore everything. Otherwise, just restore the requested items.
 265                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 266
 267                 $restoreText = $restoreAll || !empty( $timestamps );
 268                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 269
 270                 if( $restoreFiles && $this->title->getNamespace() == NS_IMAGE ) {
 271                         $img = new Image( $this->title );
 272                         $filesRestored = $img->restore( $fileVersions );
 273                 } else {
 274                         $filesRestored = 0;
 275                 }
 276
 277                 if( $restoreText ) {
 278                         $textRestored = $this->undeleteRevisions( $timestamps );
 279                 } else {
 280                         $textRestored = 0;
 281                 }
 282
 283                 // Touch the log!
 284                 global $wgContLang;
 285                 $log = new LogPage( 'delete' );
 286
 287                 if( $textRestored && $filesRestored ) {
 288                         $reason = wfMsgForContent( 'undeletedrevisions-files',
 289                                 $wgContLang->formatNum( $textRestored ),
 290                                 $wgContLang->formatNum( $filesRestored ) );
 291                 } elseif( $textRestored ) {
 292                         $reason = wfMsgForContent( 'undeletedrevisions',
 293                                 $wgContLang->formatNum( $textRestored ) );
 294                 } elseif( $filesRestored ) {
 295                         $reason = wfMsgForContent( 'undeletedfiles',
 296                                 $wgContLang->formatNum( $filesRestored ) );
 297                 } else {
 298                         wfDebug( "Undelete: nothing undeleted...\n" );
 299                         return false;
 300                 }
 301
 302                 if( trim( $comment ) != '' )
 303                         $reason .= ": {$comment}";
 304                 $log->addEntry( 'restore', $this->title, $reason );
 305
 306                 return true;
 307         }
 308
 309         /**
 310          * This is the meaty bit -- restores archived revisions of the given page
 311          * to the cur/old tables. If the page currently exists, all revisions will
 312          * be stuffed into old, otherwise the most recent will go into cur.
 313          *
 314          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 315          * @param string $comment
 316          * @param array $fileVersions
 317          *
 318          * @return int number of revisions restored
 319          */
 320         private function undeleteRevisions( $timestamps ) {
 321                 global $wgDBtype;
 322
 323                 $restoreAll = empty( $timestamps );
 324
 325                 $dbw = wfGetDB( DB_MASTER );
 326                 $page = $dbw->tableName( 'archive' );
 327
 328                 # Does this page already exist? We'll have to update it...
 329                 $article = new Article( $this->title );
 330                 $options = ( $wgDBtype == 'postgres' )
 331                         ? '' // pg doesn't support this?
 332                         : 'FOR UPDATE';
 333                 $page = $dbw->selectRow( 'page',
 334                         array( 'page_id', 'page_latest' ),
 335                         array( 'page_namespace' => $this->title->getNamespace(),
 336                                'page_title'     => $this->title->getDBkey() ),
 337                         __METHOD__,
 338                         $options );
 339                 if( $page ) {
 340                         # Page already exists. Import the history, and if necessary
 341                         # we'll update the latest revision field in the record.
 342                         $newid             = 0;
 343                         $pageId            = $page->page_id;
 344                         $previousRevId     = $page->page_latest;
 345                 } else {
 346                         # Have to create a new article...
 347                         $newid  = $article->insertOn( $dbw );
 348                         $pageId = $newid;
 349                         $previousRevId = 0;
 350                 }
 351
 352                 if( $restoreAll ) {
 353                         $oldones = '1 = 1'; # All revisions...
 354                 } else {
 355                         $oldts = implode( ',',
 356                                 array_map( array( &$dbw, 'addQuotes' ),
 357                                         array_map( array( &$dbw, 'timestamp' ),
 358                                                 $timestamps ) ) );
 359
 360                         $oldones = "ar_timestamp IN ( {$oldts} )";
 361                 }
 362
 363                 /**
 364                  * Restore each revision...
 365                  */
 366                 $result = $dbw->select( 'archive',
 367                         /* fields */ array(
 368                                 'ar_rev_id',
 369                                 'ar_text',
 370                                 'ar_comment',
 371                                 'ar_user',
 372                                 'ar_user_text',
 373                                 'ar_timestamp',
 374                                 'ar_minor_edit',
 375                                 'ar_flags',
 376                                 'ar_text_id' ),
 377                         /* WHERE */ array(
 378                                 'ar_namespace' => $this->title->getNamespace(),
 379                                 'ar_title'     => $this->title->getDBkey(),
 380                                 $oldones ),
 381                         __METHOD__,
 382                         /* options */ array(
 383                                 'ORDER BY' => 'ar_timestamp' )
 384                         );
 385                 if( $dbw->numRows( $result ) < count( $timestamps ) ) {
 386                         wfDebug( __METHOD__.": couldn't find all requested rows\n" );
 387                         return false;
 388                 }
 389
 390                 $revision = null;
 391                 $restored = 0;
 392
 393                 while( $row = $dbw->fetchObject( $result ) ) {
 394                         if( $row->ar_text_id ) {
 395                                 // Revision was deleted in 1.5+; text is in
 396                                 // the regular text table, use the reference.
 397                                 // Specify null here so the so the text is
 398                                 // dereferenced for page length info if needed.
 399                                 $revText = null;
 400                         } else {
 401                                 // Revision was deleted in 1.4 or earlier.
 402                                 // Text is squashed into the archive row, and
 403                                 // a new text table entry will be created for it.
 404                                 $revText = Revision::getRevisionText( $row, 'ar_' );
 405                         }
 406                         $revision = new Revision( array(
 407                                 'page'       => $pageId,
 408                                 'id'         => $row->ar_rev_id,
 409                                 'text'       => $revText,
 410                                 'comment'    => $row->ar_comment,
 411                                 'user'       => $row->ar_user,
 412                                 'user_text'  => $row->ar_user_text,
 413                                 'timestamp'  => $row->ar_timestamp,
 414                                 'minor_edit' => $row->ar_minor_edit,
 415                                 'text_id'    => $row->ar_text_id,
 416                                 ) );
 417                         $revision->insertOn( $dbw );
 418                         $restored++;
 419                 }
 420
 421                 if( $revision ) {
 422                         # FIXME: Update latest if newer as well...
 423                         if( $newid ) {
 424                                 // Attach the latest revision to the page...
 425                                 $article->updateRevisionOn( $dbw, $revision, $previousRevId );
 426
 427                                 // Update site stats, link tables, etc
 428                                 $article->createUpdates( $revision );
 429                         }
 430
 431                         if( $newid ) {
 432                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true ) );
 433                                 Article::onArticleCreate( $this->title );
 434                         } else {
 435                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false ) );
 436                                 Article::onArticleEdit( $this->title );
 437                         }
 438                 } else {
 439                         # Something went terribly wrong!
 440                 }
 441
 442                 # Now that it's safely stored, take it out of the archive
 443                 $dbw->delete( 'archive',
 444                         /* WHERE */ array(
 445                                 'ar_namespace' => $this->title->getNamespace(),
 446                                 'ar_title' => $this->title->getDBkey(),
 447                                 $oldones ),
 448                         __METHOD__ );
 449
 450                 return $restored;
 451         }
 452
 453 }
 454
 455 /**
 456  *
 457  * @addtogroup SpecialPage
 458  */
 459 class UndeleteForm {
 460         var $mAction, $mTarget, $mTimestamp, $mRestore, $mTargetObj;
 461         var $mTargetTimestamp, $mAllowed, $mComment;
 462
 463         function UndeleteForm( $request, $par = "" ) {
 464                 global $wgUser;
 465                 $this->mAction = $request->getVal( 'action' );
 466                 $this->mTarget = $request->getVal( 'target' );
 467                 $this->mSearchPrefix = $request->getText( 'prefix' );
 468                 $time = $request->getVal( 'timestamp' );
 469                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 470                 $this->mFile = $request->getVal( 'file' );
 471
 472                 $posted = $request->wasPosted() &&
 473                         $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 474                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 475                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 476                 $this->mComment = $request->getText( 'wpComment' );
 477
 478                 if( $par != "" ) {
 479                         $this->mTarget = $par;
 480                 }
 481                 if ( $wgUser->isAllowed( 'delete' ) && !$wgUser->isBlocked() ) {
 482                         $this->mAllowed = true;
 483                 } else {
 484                         $this->mAllowed = false;
 485                         $this->mTimestamp = '';
 486                         $this->mRestore = false;
 487                 }
 488                 if ( $this->mTarget !== "" ) {
 489                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 490                 } else {
 491                         $this->mTargetObj = NULL;
 492                 }
 493                 if( $this->mRestore ) {
 494                         $timestamps = array();
 495                         $this->mFileVersions = array();
 496                         foreach( $_REQUEST as $key => $val ) {
 497                                 $matches = array();
 498                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 499                                         array_push( $timestamps, $matches[1] );
 500                                 }
 501
 502                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 503                                         $this->mFileVersions[] = intval( $matches[1] );
 504                                 }
 505                         }
 506                         rsort( $timestamps );
 507                         $this->mTargetTimestamp = $timestamps;
 508                 }
 509         }
 510
 511         function execute() {
 512                 global $wgOut;
 513                 if ( $this->mAllowed ) {
 514                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 515                 } else {
 516                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 517                 }
 518
 519                 if( is_null( $this->mTargetObj ) ) {
 520                         $this->showSearchForm();
 521
 522                         # List undeletable articles
 523                         if( $this->mSearchPrefix ) {
 524                                 $result = PageArchive::listPagesByPrefix(
 525                                         $this->mSearchPrefix );
 526                                 $this->showList( $result );
 527                         }
 528                         return;
 529                 }
 530                 if( $this->mTimestamp !== '' ) {
 531                         return $this->showRevision( $this->mTimestamp );
 532                 }
 533                 if( $this->mFile !== null ) {
 534                         return $this->showFile( $this->mFile );
 535                 }
 536                 if( $this->mRestore && $this->mAction == "submit" ) {
 537                         return $this->undelete();
 538                 }
 539                 return $this->showHistory();
 540         }
 541
 542         function showSearchForm() {
 543                 global $wgOut, $wgScript;
 544                 $wgOut->addWikiText( wfMsg( 'undelete-header' ) );
 545
 546                 $wgOut->addHtml(
 547                         Xml::openElement( 'form', array(
 548                                 'method' => 'get',
 549                                 'action' => $wgScript ) ) .
 550                         '<fieldset>' .
 551                         Xml::element( 'legend', array(),
 552                                 wfMsg( 'undelete-search-box' ) ) .
 553                         Xml::hidden( 'title',
 554                                 SpecialPage::getTitleFor( 'Undelete' )->getPrefixedDbKey() ) .
 555                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 556                                 'prefix', 'prefix', 20,
 557                                 $this->mSearchPrefix ) .
 558                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 559                         '</fieldset>' .
 560                         '</form>' );
 561         }
 562
 563         /* private */ function showList( $result ) {
 564                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 565
 566                 if( $result->numRows() == 0 ) {
 567                         $wgOut->addWikiText( wfMsg( 'undelete-no-results' ) );
 568                         return;
 569                 }
 570
 571                 $wgOut->addWikiText( wfMsg( "undeletepagetext" ) );
 572
 573                 $sk = $wgUser->getSkin();
 574                 $undelete = SpecialPage::getTitleFor( 'Undelete' );
 575                 $wgOut->addHTML( "<ul>\n" );
 576                 while( $row = $result->fetchObject() ) {
 577                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 578                         $link = $sk->makeKnownLinkObj( $undelete, htmlspecialchars( $title->getPrefixedText() ), 'target=' . $title->getPrefixedUrl() );
 579                         #$revs = wfMsgHtml( 'undeleterevisions', $wgLang->formatNum( $row->count ) );
 580                         $revs = wfMsgExt( 'undeleterevisions',
 581                                 array( 'parseinline' ),
 582                                 $wgLang->formatNum( $row->count ) );
 583                         $wgOut->addHtml( "<li>{$link} ({$revs})</li>\n" );
 584                 }
 585                 $result->free();
 586                 $wgOut->addHTML( "</ul>\n" );
 587
 588                 return true;
 589         }
 590
 591         /* private */ function showRevision( $timestamp ) {
 592                 global $wgLang, $wgUser, $wgOut;
 593                 $self = SpecialPage::getTitleFor( 'Undelete' );
 594                 $skin = $wgUser->getSkin();
 595
 596                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 597
 598                 $archive = new PageArchive( $this->mTargetObj );
 599                 $rev = $archive->getRevision( $timestamp );
 600
 601                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 602                 $link = $skin->makeKnownLinkObj( $self, htmlspecialchars( $this->mTargetObj->getPrefixedText() ),
 603                                         'target=' . $this->mTargetObj->getPrefixedUrl() );
 604                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'undelete-revision', $link,
 605                         htmlspecialchars( $wgLang->timeAndDate( $timestamp ) ) ) . '</p>' );
 606
 607                 if( !$rev ) {
 608                         $wgOut->addWikiText( wfMsg( 'undeleterevision-missing' ) );
 609                         return;
 610                 }
 611
 612                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 613
 614                 if( $this->mPreview ) {
 615                         $wgOut->addHtml( "<hr />\n" );
 616                         $wgOut->addWikiTextTitle( $rev->getText(), $this->mTargetObj, false );
 617                 }
 618
 619                 $wgOut->addHtml(
 620                         wfElement( 'textarea', array(
 621                                         'readonly' => true,
 622                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 623                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 624                                 $rev->getText() . "\n" ) .
 625                         wfOpenElement( 'div' ) .
 626                         wfOpenElement( 'form', array(
 627                                 'method' => 'post',
 628                                 'action' => $self->getLocalURL( "action=submit" ) ) ) .
 629                         wfElement( 'input', array(
 630                                 'type' => 'hidden',
 631                                 'name' => 'target',
 632                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 633                         wfElement( 'input', array(
 634                                 'type' => 'hidden',
 635                                 'name' => 'timestamp',
 636                                 'value' => $timestamp ) ) .
 637                         wfElement( 'input', array(
 638                                 'type' => 'hidden',
 639                                 'name' => 'wpEditToken',
 640                                 'value' => $wgUser->editToken() ) ) .
 641                         wfElement( 'input', array(
 642                                 'type' => 'hidden',
 643                                 'name' => 'preview',
 644                                 'value' => '1' ) ) .
 645                         wfElement( 'input', array(
 646                                 'type' => 'submit',
 647                                 'value' => wfMsg( 'showpreview' ) ) ) .
 648                         wfCloseElement( 'form' ) .
 649                         wfCloseElement( 'div' ) );
 650         }
 651
 652         /**
 653          * Show a deleted file version requested by the visitor.
 654          */
 655         function showFile( $key ) {
 656                 global $wgOut, $wgRequest;
 657                 $wgOut->disable();
 658
 659                 # We mustn't allow the output to be Squid cached, otherwise
 660                 # if an admin previews a deleted image, and it's cached, then
 661                 # a user without appropriate permissions can toddle off and
 662                 # nab the image, and Squid will serve it
 663                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 664                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 665                 $wgRequest->response()->header( 'Pragma: no-cache' );
 666
 667                 $store = FileStore::get( 'deleted' );
 668                 $store->stream( $key );
 669         }
 670
 671         /* private */ function showHistory() {
 672                 global $wgLang, $wgUser, $wgOut;
 673
 674                 $sk = $wgUser->getSkin();
 675                 if ( $this->mAllowed ) {
 676                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 677                 } else {
 678                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
 679                 }
 680
 681                 $archive = new PageArchive( $this->mTargetObj );
 682                 /*
 683                 $text = $archive->getLastRevisionText();
 684                 if( is_null( $text ) ) {
 685                         $wgOut->addWikiText( wfMsg( "nohistory" ) );
 686                         return;
 687                 }
 688                 */
 689                 if ( $this->mAllowed ) {
 690                         $wgOut->addWikiText( wfMsg( "undeletehistory" ) );
 691                 } else {
 692                         $wgOut->addWikiText( wfMsg( "undeletehistorynoadmin" ) );
 693                 }
 694
 695                 # List all stored revisions
 696                 $revisions = $archive->listRevisions();
 697                 $files = $archive->listFiles();
 698
 699                 $haveRevisions = $revisions && $revisions->numRows() > 0;
 700                 $haveFiles = $files && $files->numRows() > 0;
 701
 702                 # Batch existence check on user and talk pages
 703                 if( $haveRevisions ) {
 704                         $batch = new LinkBatch();
 705                         while( $row = $revisions->fetchObject() ) {
 706                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
 707                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
 708                         }
 709                         $batch->execute();
 710                         $revisions->seek( 0 );
 711                 }
 712                 if( $haveFiles ) {
 713                         $batch = new LinkBatch();
 714                         while( $row = $files->fetchObject() ) {
 715                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
 716                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
 717                         }
 718                         $batch->execute();
 719                         $files->seek( 0 );
 720                 }
 721
 722                 if ( $this->mAllowed ) {
 723                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
 724                         $action = $titleObj->getLocalURL( "action=submit" );
 725                         # Start the form here
 726                         $top = wfOpenElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
 727                         $wgOut->addHtml( $top );
 728                 }
 729
 730                 # Show relevant lines from the deletion log:
 731                 $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'delete' ) ) . "</h2>\n" );
 732                 $logViewer = new LogViewer(
 733                         new LogReader(
 734                                 new FauxRequest(
 735                                         array( 'page' => $this->mTargetObj->getPrefixedText(),
 736                                                    'type' => 'delete' ) ) ) );
 737                 $logViewer->showList( $wgOut );
 738
 739                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
 740                         # Format the user-visible controls (comment field, submission button)
 741                         # in a nice little table
 742                         $table = '<fieldset><table><tr>';
 743                         $table .= '<td colspan="2">' . wfMsgWikiHtml( 'undeleteextrahelp' ) . '</td></tr><tr>';
 744                         $table .= '<td align="right"><strong>' . wfMsgHtml( 'undeletecomment' ) . '</strong></td>';
 745                         $table .= '<td>' . wfInput( 'wpComment', 50, $this->mComment ) . '</td>';
 746                         $table .= '</tr><tr><td>&nbsp;</td><td>';
 747                         $table .= wfSubmitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore' ) );
 748                         $table .= wfElement( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ) ) );
 749                         $table .= '</td></tr></table></fieldset>';
 750                         $wgOut->addHtml( $table );
 751                 }
 752
 753                 $wgOut->addHTML( "<h2>" . htmlspecialchars( wfMsg( "history" ) ) . "</h2>\n" );
 754
 755                 if( $haveRevisions ) {
 756                         # The page's stored (deleted) history:
 757                         $wgOut->addHTML("<ul>");
 758                         $target = urlencode( $this->mTarget );
 759                         while( $row = $revisions->fetchObject() ) {
 760                                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
 761                                 if ( $this->mAllowed ) {
 762                                         $checkBox = wfCheck( "ts$ts" );
 763                                         $pageLink = $sk->makeKnownLinkObj( $titleObj,
 764                                                 $wgLang->timeanddate( $ts, true ),
 765                                                 "target=$target&timestamp=$ts" );
 766                                 } else {
 767                                         $checkBox = '';
 768                                         $pageLink = $wgLang->timeanddate( $ts, true );
 769                                 }
 770                                 $userLink = $sk->userLink( $row->ar_user, $row->ar_user_text ) . $sk->userToolLinks( $row->ar_user, $row->ar_user_text );
 771                                 $comment = $sk->commentBlock( $row->ar_comment );
 772                                 $wgOut->addHTML( "<li>$checkBox $pageLink . . $userLink $comment</li>\n" );
 773
 774                         }
 775                         $revisions->free();
 776                         $wgOut->addHTML("</ul>");
 777                 } else {
 778                         $wgOut->addWikiText( wfMsg( "nohistory" ) );
 779                 }
 780
 781
 782                 if( $haveFiles ) {
 783                         $wgOut->addHtml( "<h2>" . wfMsgHtml( 'imghistory' ) . "</h2>\n" );
 784                         $wgOut->addHtml( "<ul>" );
 785                         while( $row = $files->fetchObject() ) {
 786                                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
 787                                 if ( $this->mAllowed && $row->fa_storage_key ) {
 788                                         $checkBox = wfCheck( "fileid" . $row->fa_id );
 789                                         $key = urlencode( $row->fa_storage_key );
 790                                         $target = urlencode( $this->mTarget );
 791                                         $pageLink = $sk->makeKnownLinkObj( $titleObj,
 792                                                 $wgLang->timeanddate( $ts, true ),
 793                                                 "target=$target&file=$key" );
 794                                 } else {
 795                                         $checkBox = '';
 796                                         $pageLink = $wgLang->timeanddate( $ts, true );
 797                                 }
 798                                 $userLink = $sk->userLink( $row->fa_user, $row->fa_user_text ) . $sk->userToolLinks( $row->fa_user, $row->fa_user_text );
 799                                 $data =
 800                                         wfMsgHtml( 'widthheight',
 801                                                 $wgLang->formatNum( $row->fa_width ),
 802                                                 $wgLang->formatNum( $row->fa_height ) ) .
 803                                         ' (' .
 804                                         wfMsgHtml( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
 805                                         ')';
 806                                 $comment = $sk->commentBlock( $row->fa_description );
 807                                 $wgOut->addHTML( "<li>$checkBox $pageLink . . $userLink $data $comment</li>\n" );
 808                         }
 809                         $files->free();
 810                         $wgOut->addHTML( "</ul>" );
 811                 }
 812
 813                 if ( $this->mAllowed ) {
 814                         # Slip in the hidden controls here
 815                         $misc  = wfHidden( 'target', $this->mTarget );
 816                         $misc .= wfHidden( 'wpEditToken', $wgUser->editToken() );
 817                         $wgOut->addHtml( $misc . '</form>' );
 818                 }
 819
 820                 return true;
 821         }
 822
 823         function undelete() {
 824                 global $wgOut, $wgUser;
 825                 if( !is_null( $this->mTargetObj ) ) {
 826                         $archive = new PageArchive( $this->mTargetObj );
 827
 828                         $ok = $archive->undelete(
 829                                 $this->mTargetTimestamp,
 830                                 $this->mComment,
 831                                 $this->mFileVersions );
 832
 833                         if( $ok ) {
 834                                 $skin = $wgUser->getSkin();
 835                                 $link = $skin->makeKnownLinkObj( $this->mTargetObj );
 836                                 $wgOut->addHtml( wfMsgWikiHtml( 'undeletedpage', $link ) );
 837                                 return true;
 838                         }
 839                 }
 840                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
 841                 return false;
 842         }
 843 }
 844
 845 ?>