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