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 SpecialPage
   8  */
   9
  10 /**
  11  * Constructor
  12  */
  13 function wfSpecialUndelete( $par ) {
  14         global $wgRequest;
  15
  16         $form = new UndeleteForm( $wgRequest, $par );
  17         $form->execute();
  18 }
  19
  20 /**
  21  * Used to show archived pages and eventually restore them.
  22  * @addtogroup SpecialPage
  23  */
  24 class PageArchive {
  25         protected $title;
  26         var $fileStatus;
  27
  28         function __construct( $title ) {
  29                 if( is_null( $title ) ) {
  30                         throw new MWException( 'Archiver() given a null title.');
  31                 }
  32                 $this->title = $title;
  33         }
  34
  35         /**
  36          * List all deleted pages recorded in the archive table. Returns result
  37          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  38          * namespace/title.
  39          *
  40          * @return ResultWrapper
  41          */
  42         public static function listAllPages() {
  43                 $dbr = wfGetDB( DB_SLAVE );
  44                 return self::listPages( $dbr, '' );
  45         }
  46
  47         /**
  48          * List deleted pages recorded in the archive table matching the
  49          * given title prefix.
  50          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  51          *
  52          * @return ResultWrapper
  53          */
  54         public static function listPagesByPrefix( $prefix ) {
  55                 $dbr = wfGetDB( DB_SLAVE );
  56
  57                 $title = Title::newFromText( $prefix );
  58                 if( $title ) {
  59                         $ns = $title->getNamespace();
  60                         $encPrefix = $dbr->escapeLike( $title->getDbKey() );
  61                 } else {
  62                         // Prolly won't work too good
  63                         // @todo handle bare namespace names cleanly?
  64                         $ns = 0;
  65                         $encPrefix = $dbr->escapeLike( $prefix );
  66                 }
  67                 $conds = array(
  68                         'ar_namespace' => $ns,
  69                         "ar_title LIKE '$encPrefix%'",
  70                 );
  71                 return self::listPages( $dbr, $conds );
  72         }
  73
  74         protected static function listPages( $dbr, $condition ) {
  75                 return $dbr->resultObject(
  76                         $dbr->select(
  77                                 array( 'archive' ),
  78                                 array(
  79                                         'ar_namespace',
  80                                         'ar_title',
  81                                         'COUNT(*) AS count',
  82                                 ),
  83                                 $condition,
  84                                 __METHOD__,
  85                                 array(
  86                                         'GROUP BY' => 'ar_namespace,ar_title',
  87                                         'ORDER BY' => 'ar_namespace,ar_title',
  88                                         'LIMIT' => 100,
  89                                 )
  90                         )
  91                 );
  92         }
  93
  94         /**
  95          * List the revisions of the given page. Returns result wrapper with
  96          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
  97          *
  98          * @return ResultWrapper
  99          */
 100         function listRevisions() {
 101                 $dbr = wfGetDB( DB_SLAVE );
 102                 $res = $dbr->select( 'archive',
 103                         array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment', 'ar_len' ),
 104                         array( 'ar_namespace' => $this->title->getNamespace(),
 105                                'ar_title' => $this->title->getDBkey() ),
 106                         'PageArchive::listRevisions',
 107                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 108                 $ret = $dbr->resultObject( $res );
 109                 return $ret;
 110         }
 111
 112         /**
 113          * List the deleted file revisions for this page, if it's a file page.
 114          * Returns a result wrapper with various filearchive fields, or null
 115          * if not a file page.
 116          *
 117          * @return ResultWrapper
 118          * @todo Does this belong in Image for fuller encapsulation?
 119          */
 120         function listFiles() {
 121                 if( $this->title->getNamespace() == NS_IMAGE ) {
 122                         $dbr = wfGetDB( DB_SLAVE );
 123                         $res = $dbr->select( 'filearchive',
 124                                 array(
 125                                         'fa_id',
 126                                         'fa_name',
 127                                         'fa_storage_key',
 128                                         'fa_size',
 129                                         'fa_width',
 130                                         'fa_height',
 131                                         'fa_description',
 132                                         'fa_user',
 133                                         'fa_user_text',
 134                                         'fa_timestamp' ),
 135                                 array( 'fa_name' => $this->title->getDbKey() ),
 136                                 __METHOD__,
 137                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 138                         $ret = $dbr->resultObject( $res );
 139                         return $ret;
 140                 }
 141                 return null;
 142         }
 143
 144         /**
 145          * Fetch (and decompress if necessary) the stored text for the deleted
 146          * revision of the page with the given timestamp.
 147          *
 148          * @return string
 149          * @deprecated Use getRevision() for more flexible information
 150          */
 151         function getRevisionText( $timestamp ) {
 152                 $rev = $this->getRevision( $timestamp );
 153                 return $rev ? $rev->getText() : null;
 154         }
 155
 156         /**
 157          * Return a Revision object containing data for the deleted revision.
 158          * Note that the result *may* or *may not* have a null page ID.
 159          * @param string $timestamp
 160          * @return Revision
 161          */
 162         function getRevision( $timestamp ) {
 163                 $dbr = wfGetDB( DB_SLAVE );
 164                 $row = $dbr->selectRow( 'archive',
 165                         array(
 166                                 'ar_rev_id',
 167                                 'ar_text',
 168                                 'ar_comment',
 169                                 'ar_user',
 170                                 'ar_user_text',
 171                                 'ar_timestamp',
 172                                 'ar_minor_edit',
 173                                 'ar_flags',
 174                                 'ar_text_id',
 175                                 'ar_len' ),
 176                         array( 'ar_namespace' => $this->title->getNamespace(),
 177                                'ar_title' => $this->title->getDbkey(),
 178                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 179                         __METHOD__ );
 180                 if( $row ) {
 181                         return new Revision( array(
 182                                 'page'       => $this->title->getArticleId(),
 183                                 'id'         => $row->ar_rev_id,
 184                                 'text'       => ($row->ar_text_id
 185                                         ? null
 186                                         : Revision::getRevisionText( $row, 'ar_' ) ),
 187                                 'comment'    => $row->ar_comment,
 188                                 'user'       => $row->ar_user,
 189                                 'user_text'  => $row->ar_user_text,
 190                                 'timestamp'  => $row->ar_timestamp,
 191                                 'minor_edit' => $row->ar_minor_edit,
 192                                 'text_id'    => $row->ar_text_id ) );
 193                 } else {
 194                         return null;
 195                 }
 196         }
 197
 198         /**
 199          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 200          */
 201         function getTextFromRow( $row ) {
 202                 if( is_null( $row->ar_text_id ) ) {
 203                         // An old row from MediaWiki 1.4 or previous.
 204                         // Text is embedded in this row in classic compression format.
 205                         return Revision::getRevisionText( $row, "ar_" );
 206                 } else {
 207                         // New-style: keyed to the text storage backend.
 208                         $dbr = wfGetDB( DB_SLAVE );
 209                         $text = $dbr->selectRow( 'text',
 210                                 array( 'old_text', 'old_flags' ),
 211                                 array( 'old_id' => $row->ar_text_id ),
 212                                 __METHOD__ );
 213                         return Revision::getRevisionText( $text );
 214                 }
 215         }
 216
 217
 218         /**
 219          * Fetch (and decompress if necessary) the stored text of the most
 220          * recently edited deleted revision of the page.
 221          *
 222          * If there are no archived revisions for the page, returns NULL.
 223          *
 224          * @return string
 225          */
 226         function getLastRevisionText() {
 227                 $dbr = wfGetDB( DB_SLAVE );
 228                 $row = $dbr->selectRow( 'archive',
 229                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 230                         array( 'ar_namespace' => $this->title->getNamespace(),
 231                                'ar_title' => $this->title->getDBkey() ),
 232                         'PageArchive::getLastRevisionText',
 233                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 234                 if( $row ) {
 235                         return $this->getTextFromRow( $row );
 236                 } else {
 237                         return NULL;
 238                 }
 239         }
 240
 241         /**
 242          * Quick check if any archived revisions are present for the page.
 243          * @return bool
 244          */
 245         function isDeleted() {
 246                 $dbr = wfGetDB( DB_SLAVE );
 247                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 248                         array( 'ar_namespace' => $this->title->getNamespace(),
 249                                'ar_title' => $this->title->getDBkey() ) );
 250                 return ($n > 0);
 251         }
 252
 253         /**
 254          * Restore the given (or all) text and file revisions for the page.
 255          * Once restored, the items will be removed from the archive tables.
 256          * The deletion log will be updated with an undeletion notice.
 257          *
 258          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 259          * @param string $comment
 260          * @param array $fileVersions
 261          *
 262          * @return true on success.
 263          */
 264         function undelete( $timestamps, $comment = '', $fileVersions = array() ) {
 265                 // If both the set of text revisions and file revisions are empty,
 266                 // restore everything. Otherwise, just restore the requested items.
 267                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 268
 269                 $restoreText = $restoreAll || !empty( $timestamps );
 270                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 271
 272                 if( $restoreFiles && $this->title->getNamespace() == NS_IMAGE ) {
 273                         $img = wfLocalFile( $this->title );
 274                         $this->fileStatus = $img->restore( $fileVersions );
 275                         $filesRestored = $this->fileStatus->successCount;
 276                 } else {
 277                         $filesRestored = 0;
 278                 }
 279
 280                 if( $restoreText ) {
 281                         $textRestored = $this->undeleteRevisions( $timestamps );
 282                 } else {
 283                         $textRestored = 0;
 284                 }
 285
 286                 // Touch the log!
 287                 global $wgContLang;
 288                 $log = new LogPage( 'delete' );
 289
 290                 if( $textRestored && $filesRestored ) {
 291                         $reason = wfMsgForContent( 'undeletedrevisions-files',
 292                                 $wgContLang->formatNum( $textRestored ),
 293                                 $wgContLang->formatNum( $filesRestored ) );
 294                 } elseif( $textRestored ) {
 295                         $reason = wfMsgForContent( 'undeletedrevisions',
 296                                 $wgContLang->formatNum( $textRestored ) );
 297                 } elseif( $filesRestored ) {
 298                         $reason = wfMsgForContent( 'undeletedfiles',
 299                                 $wgContLang->formatNum( $filesRestored ) );
 300                 } else {
 301                         wfDebug( "Undelete: nothing undeleted...\n" );
 302                         return false;
 303                 }
 304
 305                 if( trim( $comment ) != '' )
 306                         $reason .= ": {$comment}";
 307                 $log->addEntry( 'restore', $this->title, $reason );
 308
 309                 if ( $this->fileStatus && !$this->fileStatus->ok ) {
 310                         return false;
 311                 } else {
 312                         return true;
 313                 }
 314         }
 315
 316         /**
 317          * This is the meaty bit -- restores archived revisions of the given page
 318          * to the cur/old tables. If the page currently exists, all revisions will
 319          * be stuffed into old, otherwise the most recent will go into cur.
 320          *
 321          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 322          * @param string $comment
 323          * @param array $fileVersions
 324          *
 325          * @return int number of revisions restored
 326          */
 327         private function undeleteRevisions( $timestamps ) {
 328                 $restoreAll = empty( $timestamps );
 329
 330                 $dbw = wfGetDB( DB_MASTER );
 331                 $page = $dbw->tableName( 'archive' );
 332
 333                 # Does this page already exist? We'll have to update it...
 334                 $article = new Article( $this->title );
 335                 $options = 'FOR UPDATE';
 336                 $page = $dbw->selectRow( 'page',
 337                         array( 'page_id', 'page_latest' ),
 338                         array( 'page_namespace' => $this->title->getNamespace(),
 339                                'page_title'     => $this->title->getDBkey() ),
 340                         __METHOD__,
 341                         $options );
 342                 if( $page ) {
 343                         # Page already exists. Import the history, and if necessary
 344                         # we'll update the latest revision field in the record.
 345                         $newid             = 0;
 346                         $pageId            = $page->page_id;
 347                         $previousRevId     = $page->page_latest;
 348                 } else {
 349                         # Have to create a new article...
 350                         $newid  = $article->insertOn( $dbw );
 351                         $pageId = $newid;
 352                         $previousRevId = 0;
 353                 }
 354
 355                 if( $restoreAll ) {
 356                         $oldones = '1 = 1'; # All revisions...
 357                 } else {
 358                         $oldts = implode( ',',
 359                                 array_map( array( &$dbw, 'addQuotes' ),
 360                                         array_map( array( &$dbw, 'timestamp' ),
 361                                                 $timestamps ) ) );
 362
 363                         $oldones = "ar_timestamp IN ( {$oldts} )";
 364                 }
 365
 366                 /**
 367                  * Restore each revision...
 368                  */
 369                 $result = $dbw->select( 'archive',
 370                         /* fields */ array(
 371                                 'ar_rev_id',
 372                                 'ar_text',
 373                                 'ar_comment',
 374                                 'ar_user',
 375                                 'ar_user_text',
 376                                 'ar_timestamp',
 377                                 'ar_minor_edit',
 378                                 'ar_flags',
 379                                 'ar_text_id',
 380                                 'ar_len' ),
 381                         /* WHERE */ array(
 382                                 'ar_namespace' => $this->title->getNamespace(),
 383                                 'ar_title'     => $this->title->getDBkey(),
 384                                 $oldones ),
 385                         __METHOD__,
 386                         /* options */ array(
 387                                 'ORDER BY' => 'ar_timestamp' )
 388                         );
 389                 if( $dbw->numRows( $result ) < count( $timestamps ) ) {
 390                         wfDebug( __METHOD__.": couldn't find all requested rows\n" );
 391                         return false;
 392                 }
 393
 394                 $revision = null;
 395                 $restored = 0;
 396
 397                 while( $row = $dbw->fetchObject( $result ) ) {
 398                         if( $row->ar_text_id ) {
 399                                 // Revision was deleted in 1.5+; text is in
 400                                 // the regular text table, use the reference.
 401                                 // Specify null here so the so the text is
 402                                 // dereferenced for page length info if needed.
 403                                 $revText = null;
 404                         } else {
 405                                 // Revision was deleted in 1.4 or earlier.
 406                                 // Text is squashed into the archive row, and
 407                                 // a new text table entry will be created for it.
 408                                 $revText = Revision::getRevisionText( $row, 'ar_' );
 409                         }
 410                         $revision = new Revision( array(
 411                                 'page'       => $pageId,
 412                                 'id'         => $row->ar_rev_id,
 413                                 'text'       => $revText,
 414                                 'comment'    => $row->ar_comment,
 415                                 'user'       => $row->ar_user,
 416                                 'user_text'  => $row->ar_user_text,
 417                                 'timestamp'  => $row->ar_timestamp,
 418                                 'minor_edit' => $row->ar_minor_edit,
 419                                 'text_id'    => $row->ar_text_id,
 420                                 'len'            => $row->ar_len
 421                                 ) );
 422                         $revision->insertOn( $dbw );
 423                         $restored++;
 424                 }
 425
 426                 if( $revision ) {
 427                         // Attach the latest revision to the page...
 428                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 429
 430                         if( $newid || $wasnew ) {
 431                                 // Update site stats, link tables, etc
 432                                 $article->createUpdates( $revision );
 433                         }
 434
 435                         if( $newid ) {
 436                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true ) );
 437                                 Article::onArticleCreate( $this->title );
 438                         } else {
 439                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false ) );
 440                                 Article::onArticleEdit( $this->title );
 441                         }
 442                 } else {
 443                         # Something went terribly wrong!
 444                 }
 445
 446                 # Now that it's safely stored, take it out of the archive
 447                 $dbw->delete( 'archive',
 448                         /* WHERE */ array(
 449                                 'ar_namespace' => $this->title->getNamespace(),
 450                                 'ar_title' => $this->title->getDBkey(),
 451                                 $oldones ),
 452                         __METHOD__ );
 453
 454                 return $restored;
 455         }
 456
 457         function getFileStatus() { return $this->fileStatus; }
 458 }
 459
 460 /**
 461  * The HTML form for Special:Undelete, which allows users with the appropriate
 462  * permissions to view and restore deleted content.
 463  * @addtogroup SpecialPage
 464  */
 465 class UndeleteForm {
 466         var $mAction, $mTarget, $mTimestamp, $mRestore, $mTargetObj;
 467         var $mTargetTimestamp, $mAllowed, $mComment;
 468
 469         function UndeleteForm( $request, $par = "" ) {
 470                 global $wgUser;
 471                 $this->mAction = $request->getVal( 'action' );
 472                 $this->mTarget = $request->getVal( 'target' );
 473                 $this->mSearchPrefix = $request->getText( 'prefix' );
 474                 $time = $request->getVal( 'timestamp' );
 475                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 476                 $this->mFile = $request->getVal( 'file' );
 477
 478                 $posted = $request->wasPosted() &&
 479                         $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 480                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 481                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 482                 $this->mComment = $request->getText( 'wpComment' );
 483
 484                 if( $par != "" ) {
 485                         $this->mTarget = $par;
 486                 }
 487                 if ( $wgUser->isAllowed( 'delete' ) && !$wgUser->isBlocked() ) {
 488                         $this->mAllowed = true;
 489                 } else {
 490                         $this->mAllowed = false;
 491                         $this->mTimestamp = '';
 492                         $this->mRestore = false;
 493                 }
 494                 if ( $this->mTarget !== "" ) {
 495                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 496                 } else {
 497                         $this->mTargetObj = NULL;
 498                 }
 499                 if( $this->mRestore ) {
 500                         $timestamps = array();
 501                         $this->mFileVersions = array();
 502                         foreach( $_REQUEST as $key => $val ) {
 503                                 $matches = array();
 504                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 505                                         array_push( $timestamps, $matches[1] );
 506                                 }
 507
 508                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 509                                         $this->mFileVersions[] = intval( $matches[1] );
 510                                 }
 511                         }
 512                         rsort( $timestamps );
 513                         $this->mTargetTimestamp = $timestamps;
 514                 }
 515         }
 516
 517         function execute() {
 518                 global $wgOut;
 519                 if ( $this->mAllowed ) {
 520                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 521                 } else {
 522                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 523                 }
 524
 525                 if( is_null( $this->mTargetObj ) ) {
 526                         $this->showSearchForm();
 527
 528                         # List undeletable articles
 529                         if( $this->mSearchPrefix ) {
 530                                 $result = PageArchive::listPagesByPrefix(
 531                                         $this->mSearchPrefix );
 532                                 $this->showList( $result );
 533                         }
 534                         return;
 535                 }
 536                 if( $this->mTimestamp !== '' ) {
 537                         return $this->showRevision( $this->mTimestamp );
 538                 }
 539                 if( $this->mFile !== null ) {
 540                         return $this->showFile( $this->mFile );
 541                 }
 542                 if( $this->mRestore && $this->mAction == "submit" ) {
 543                         return $this->undelete();
 544                 }
 545                 return $this->showHistory();
 546         }
 547
 548         function showSearchForm() {
 549                 global $wgOut, $wgScript;
 550                 $wgOut->addWikiText( wfMsg( 'undelete-header' ) );
 551
 552                 $wgOut->addHtml(
 553                         Xml::openElement( 'form', array(
 554                                 'method' => 'get',
 555                                 'action' => $wgScript ) ) .
 556                         '<fieldset>' .
 557                         Xml::element( 'legend', array(),
 558                                 wfMsg( 'undelete-search-box' ) ) .
 559                         Xml::hidden( 'title',
 560                                 SpecialPage::getTitleFor( 'Undelete' )->getPrefixedDbKey() ) .
 561                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 562                                 'prefix', 'prefix', 20,
 563                                 $this->mSearchPrefix ) .
 564                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 565                         '</fieldset>' .
 566                         '</form>' );
 567         }
 568
 569         /* private */ function showList( $result ) {
 570                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 571
 572                 if( $result->numRows() == 0 ) {
 573                         $wgOut->addWikiText( wfMsg( 'undelete-no-results' ) );
 574                         return;
 575                 }
 576
 577                 $wgOut->addWikiText( wfMsg( "undeletepagetext" ) );
 578
 579                 $sk = $wgUser->getSkin();
 580                 $undelete = SpecialPage::getTitleFor( 'Undelete' );
 581                 $wgOut->addHTML( "<ul>\n" );
 582                 while( $row = $result->fetchObject() ) {
 583                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 584                         $link = $sk->makeKnownLinkObj( $undelete, htmlspecialchars( $title->getPrefixedText() ), 'target=' . $title->getPrefixedUrl() );
 585                         #$revs = wfMsgHtml( 'undeleterevisions', $wgLang->formatNum( $row->count ) );
 586                         $revs = wfMsgExt( 'undeleterevisions',
 587                                 array( 'parseinline' ),
 588                                 $wgLang->formatNum( $row->count ) );
 589                         $wgOut->addHtml( "<li>{$link} ({$revs})</li>\n" );
 590                 }
 591                 $result->free();
 592                 $wgOut->addHTML( "</ul>\n" );
 593
 594                 return true;
 595         }
 596
 597         /* private */ function showRevision( $timestamp ) {
 598                 global $wgLang, $wgUser, $wgOut;
 599                 $self = SpecialPage::getTitleFor( 'Undelete' );
 600                 $skin = $wgUser->getSkin();
 601
 602                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 603
 604                 $archive = new PageArchive( $this->mTargetObj );
 605                 $rev = $archive->getRevision( $timestamp );
 606
 607                 if( !$rev ) {
 608                         $wgOut->addWikiTexT( wfMsg( 'undeleterevision-missing' ) );
 609                         return;
 610                 }
 611
 612                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 613
 614                 $link = $skin->makeKnownLinkObj(
 615                         $self,
 616                         htmlspecialchars( $this->mTargetObj->getPrefixedText() ),
 617                         'target=' . $this->mTargetObj->getPrefixedUrl()
 618                 );
 619                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp ) );
 620                 $user = $skin->userLink( $rev->getUser(), $rev->getUserText() )
 621                         . $skin->userToolLinks( $rev->getUser(), $rev->getUserText() );
 622
 623                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'undelete-revision', $link, $time, $user ) . '</p>' );
 624
 625                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 626
 627                 if( $this->mPreview ) {
 628                         $wgOut->addHtml( "<hr />\n" );
 629                         $wgOut->addWikiTextTitleTidy( $rev->getText(), $this->mTargetObj, false );
 630                 }
 631
 632                 $wgOut->addHtml(
 633                         wfElement( 'textarea', array(
 634                                         'readonly' => 'readonly',
 635                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 636                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 637                                 $rev->getText() . "\n" ) .
 638                         wfOpenElement( 'div' ) .
 639                         wfOpenElement( 'form', array(
 640                                 'method' => 'post',
 641                                 'action' => $self->getLocalURL( "action=submit" ) ) ) .
 642                         wfElement( 'input', array(
 643                                 'type' => 'hidden',
 644                                 'name' => 'target',
 645                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 646                         wfElement( 'input', array(
 647                                 'type' => 'hidden',
 648                                 'name' => 'timestamp',
 649                                 'value' => $timestamp ) ) .
 650                         wfElement( 'input', array(
 651                                 'type' => 'hidden',
 652                                 'name' => 'wpEditToken',
 653                                 'value' => $wgUser->editToken() ) ) .
 654                         wfElement( 'input', array(
 655                                 'type' => 'hidden',
 656                                 'name' => 'preview',
 657                                 'value' => '1' ) ) .
 658                         wfElement( 'input', array(
 659                                 'type' => 'submit',
 660                                 'value' => wfMsg( 'showpreview' ) ) ) .
 661                         wfCloseElement( 'form' ) .
 662                         wfCloseElement( 'div' ) );
 663         }
 664
 665         /**
 666          * Show a deleted file version requested by the visitor.
 667          */
 668         function showFile( $key ) {
 669                 global $wgOut, $wgRequest;
 670                 $wgOut->disable();
 671
 672                 # We mustn't allow the output to be Squid cached, otherwise
 673                 # if an admin previews a deleted image, and it's cached, then
 674                 # a user without appropriate permissions can toddle off and
 675                 # nab the image, and Squid will serve it
 676                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 677                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 678                 $wgRequest->response()->header( 'Pragma: no-cache' );
 679
 680                 $store = FileStore::get( 'deleted' );
 681                 $store->stream( $key );
 682         }
 683
 684         /* private */ function showHistory() {
 685                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 686
 687                 $sk = $wgUser->getSkin();
 688                 if ( $this->mAllowed ) {
 689                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 690                 } else {
 691                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
 692                 }
 693
 694                 $archive = new PageArchive( $this->mTargetObj );
 695                 /*
 696                 $text = $archive->getLastRevisionText();
 697                 if( is_null( $text ) ) {
 698                         $wgOut->addWikiText( wfMsg( "nohistory" ) );
 699                         return;
 700                 }
 701                 */
 702                 if ( $this->mAllowed ) {
 703                         $wgOut->addWikiText( wfMsg( "undeletehistory" ) );
 704                 } else {
 705                         $wgOut->addWikiText( wfMsg( "undeletehistorynoadmin" ) );
 706                 }
 707
 708                 # List all stored revisions
 709                 $revisions = $archive->listRevisions();
 710                 $files = $archive->listFiles();
 711
 712                 $haveRevisions = $revisions && $revisions->numRows() > 0;
 713                 $haveFiles = $files && $files->numRows() > 0;
 714
 715                 # Batch existence check on user and talk pages
 716                 if( $haveRevisions ) {
 717                         $batch = new LinkBatch();
 718                         while( $row = $revisions->fetchObject() ) {
 719                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
 720                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
 721                         }
 722                         $batch->execute();
 723                         $revisions->seek( 0 );
 724                 }
 725                 if( $haveFiles ) {
 726                         $batch = new LinkBatch();
 727                         while( $row = $files->fetchObject() ) {
 728                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
 729                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
 730                         }
 731                         $batch->execute();
 732                         $files->seek( 0 );
 733                 }
 734
 735                 if ( $this->mAllowed ) {
 736                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
 737                         $action = $titleObj->getLocalURL( "action=submit" );
 738                         # Start the form here
 739                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
 740                         $wgOut->addHtml( $top );
 741                 }
 742
 743                 # Show relevant lines from the deletion log:
 744                 $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'delete' ) ) . "</h2>\n" );
 745                 $logViewer = new LogViewer(
 746                         new LogReader(
 747                                 new FauxRequest(
 748                                         array(
 749                                                 'page' => $this->mTargetObj->getPrefixedText(),
 750                                                 'type' => 'delete'
 751                                         )
 752                                 )
 753                         ), LogViewer::NO_ACTION_LINK
 754                 );
 755                 $logViewer->showList( $wgOut );
 756
 757                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
 758                         # Format the user-visible controls (comment field, submission button)
 759                         # in a nice little table
 760                         $align = $wgContLang->isRtl() ? 'left' : 'right';
 761                         $table =
 762                                 Xml::openElement( 'fieldset' ) .
 763                                 Xml::openElement( 'table' ) .
 764                                         "<tr>
 765                                                 <td colspan='2'>" .
 766                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
 767                                                 "</td>
 768                                         </tr>
 769                                         <tr>
 770                                                 <td align='$align'>" .
 771                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
 772                                                 "</td>
 773                                                 <td>" .
 774                                                         Xml::input( 'wpComment', 50, $this->mComment ) .
 775                                                 "</td>
 776                                         </tr>
 777                                         <tr>
 778                                                 <td>&nbsp;</td>
 779                                                 <td>" .
 780                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) .
 781                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) .
 782                                                 "</td>
 783                                         </tr>" .
 784                                 Xml::closeElement( 'table' ) .
 785                                 Xml::closeElement( 'fieldset' );
 786
 787                         $wgOut->addHtml( $table );
 788                 }
 789
 790                 $wgOut->addHTML( "<h2>" . htmlspecialchars( wfMsg( "history" ) ) . "</h2>\n" );
 791
 792                 if( $haveRevisions ) {
 793                         # The page's stored (deleted) history:
 794                         $wgOut->addHTML("<ul>");
 795                         $target = urlencode( $this->mTarget );
 796                         while( $row = $revisions->fetchObject() ) {
 797                                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
 798                                 if ( $this->mAllowed ) {
 799                                         $checkBox = Xml::check( "ts$ts" );
 800                                         $pageLink = $sk->makeKnownLinkObj( $titleObj,
 801                                                 $wgLang->timeanddate( $ts, true ),
 802                                                 "target=$target&timestamp=$ts" );
 803                                 } else {
 804                                         $checkBox = '';
 805                                         $pageLink = $wgLang->timeanddate( $ts, true );
 806                                 }
 807                                 $userLink = $sk->userLink( $row->ar_user, $row->ar_user_text ) . $sk->userToolLinks( $row->ar_user, $row->ar_user_text );
 808                                 $stxt = '';
 809                                 if (!is_null($size = $row->ar_len)) {
 810                                         if ($size == 0) {
 811                                                 $stxt = wfMsgHtml('historyempty');
 812                                         } else {
 813                                                 $stxt = wfMsgHtml('historysize', $wgLang->formatNum( $size ) );
 814                                         }
 815                                 }
 816                                 $comment = $sk->commentBlock( $row->ar_comment );
 817                                 $wgOut->addHTML( "<li>$checkBox $pageLink . . $userLink $stxt $comment</li>\n" );
 818
 819                         }
 820                         $revisions->free();
 821                         $wgOut->addHTML("</ul>");
 822                 } else {
 823                         $wgOut->addWikiText( wfMsg( "nohistory" ) );
 824                 }
 825
 826                 if( $haveFiles ) {
 827                         $wgOut->addHtml( "<h2>" . wfMsgHtml( 'filehist' ) . "</h2>\n" );
 828                         $wgOut->addHtml( "<ul>" );
 829                         while( $row = $files->fetchObject() ) {
 830                                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
 831                                 if ( $this->mAllowed && $row->fa_storage_key ) {
 832                                         $checkBox = Xml::check( "fileid" . $row->fa_id );
 833                                         $key = urlencode( $row->fa_storage_key );
 834                                         $target = urlencode( $this->mTarget );
 835                                         $pageLink = $sk->makeKnownLinkObj( $titleObj,
 836                                                 $wgLang->timeanddate( $ts, true ),
 837                                                 "target=$target&file=$key" );
 838                                 } else {
 839                                         $checkBox = '';
 840                                         $pageLink = $wgLang->timeanddate( $ts, true );
 841                                 }
 842                                 $userLink = $sk->userLink( $row->fa_user, $row->fa_user_text ) . $sk->userToolLinks( $row->fa_user, $row->fa_user_text );
 843                                 $data =
 844                                         wfMsgHtml( 'widthheight',
 845                                                 $wgLang->formatNum( $row->fa_width ),
 846                                                 $wgLang->formatNum( $row->fa_height ) ) .
 847                                         ' (' .
 848                                         wfMsgHtml( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
 849                                         ')';
 850                                 $comment = $sk->commentBlock( $row->fa_description );
 851                                 $wgOut->addHTML( "<li>$checkBox $pageLink . . $userLink $data $comment</li>\n" );
 852                         }
 853                         $files->free();
 854                         $wgOut->addHTML( "</ul>" );
 855                 }
 856
 857                 if ( $this->mAllowed ) {
 858                         # Slip in the hidden controls here
 859                         $misc  = Xml::hidden( 'target', $this->mTarget );
 860                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
 861                         $misc .= Xml::closeElement( 'form' );
 862                         $wgOut->addHtml( $misc );
 863                 }
 864
 865                 return true;
 866         }
 867
 868         function undelete() {
 869                 global $wgOut, $wgUser;
 870                 if( !is_null( $this->mTargetObj ) ) {
 871                         $archive = new PageArchive( $this->mTargetObj );
 872
 873                         $ok = $archive->undelete(
 874                                 $this->mTargetTimestamp,
 875                                 $this->mComment,
 876                                 $this->mFileVersions );
 877
 878                         if( $ok ) {
 879                                 $skin = $wgUser->getSkin();
 880                                 $link = $skin->makeKnownLinkObj( $this->mTargetObj );
 881                                 $wgOut->addHtml( wfMsgWikiHtml( 'undeletedpage', $link ) );
 882                         } else {
 883                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
 884                         }
 885
 886                         // Show file deletion warnings and errors
 887                         $status = $archive->getFileStatus();
 888                         if ( $status && !$status->isGood() ) {
 889                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
 890                         }
 891                 } else {
 892                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
 893                 }
 894                 return false;
 895         }
 896 }
 897
 898