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', 'ar_deleted' ),
 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_archive_name',
 128                                         'fa_storage_key',
 129                                         'fa_storage_group',
 130                                         'fa_size',
 131                                         'fa_width',
 132                                         'fa_height',
 133                                         'fa_bits',
 134                                         'fa_metadata',
 135                                         'fa_media_type',
 136                                         'fa_major_mime',
 137                                         'fa_minor_mime',
 138                                         'fa_description',
 139                                         'fa_user',
 140                                         'fa_user_text',
 141                                         'fa_timestamp',
 142                                         'fa_deleted' ),
 143                                 array( 'fa_name' => $this->title->getDBkey() ),
 144                                 __METHOD__,
 145                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 146                         $ret = $dbr->resultObject( $res );
 147                         return $ret;
 148                 }
 149                 return null;
 150         }
 151
 152         /**
 153          * Fetch (and decompress if necessary) the stored text for the deleted
 154          * revision of the page with the given timestamp.
 155          *
 156          * @return string
 157          * @deprecated Use getRevision() for more flexible information
 158          */
 159         function getRevisionText( $timestamp ) {
 160                 $rev = $this->getRevision( $timestamp );
 161                 return $rev ? $rev->getText() : null;
 162         }
 163
 164         /**
 165          * Return a Revision object containing data for the deleted revision.
 166          * Note that the result *may* or *may not* have a null page ID.
 167          * @param string $timestamp
 168          * @return Revision
 169          */
 170         function getRevision( $timestamp ) {
 171                 $dbr = wfGetDB( DB_SLAVE );
 172                 $row = $dbr->selectRow( 'archive',
 173                         array(
 174                                 'ar_rev_id',
 175                                 'ar_text',
 176                                 'ar_comment',
 177                                 'ar_user',
 178                                 'ar_user_text',
 179                                 'ar_timestamp',
 180                                 'ar_minor_edit',
 181                                 'ar_flags',
 182                                 'ar_text_id',
 183                                 'ar_deleted',
 184                                 'ar_len' ),
 185                         array( 'ar_namespace' => $this->title->getNamespace(),
 186                                'ar_title' => $this->title->getDBkey(),
 187                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 188                         __METHOD__ );
 189                 if( $row ) {
 190                         return new Revision( array(
 191                                 'page'       => $this->title->getArticleId(),
 192                                 'id'         => $row->ar_rev_id,
 193                                 'text'       => ($row->ar_text_id
 194                                         ? null
 195                                         : Revision::getRevisionText( $row, 'ar_' ) ),
 196                                 'comment'    => $row->ar_comment,
 197                                 'user'       => $row->ar_user,
 198                                 'user_text'  => $row->ar_user_text,
 199                                 'timestamp'  => $row->ar_timestamp,
 200                                 'minor_edit' => $row->ar_minor_edit,
 201                                 'text_id'    => $row->ar_text_id,
 202                                 'deleted'    => $row->ar_deleted,
 203                                 'len'        => $row->ar_len) );
 204                 } else {
 205                         return null;
 206                 }
 207         }
 208
 209         /**
 210          * Return the most-previous revision, either live or deleted, against
 211          * the deleted revision given by timestamp.
 212          *
 213          * May produce unexpected results in case of history merges or other
 214          * unusual time issues.
 215          *
 216          * @param string $timestamp
 217          * @return Revision or null
 218          */
 219         function getPreviousRevision( $timestamp ) {
 220                 $dbr = wfGetDB( DB_SLAVE );
 221
 222                 // Check the previous deleted revision...
 223                 $row = $dbr->selectRow( 'archive',
 224                         'ar_timestamp',
 225                         array( 'ar_namespace' => $this->title->getNamespace(),
 226                                'ar_title' => $this->title->getDBkey(),
 227                                'ar_timestamp < ' .
 228                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 229                         __METHOD__,
 230                         array(
 231                                 'ORDER BY' => 'ar_timestamp DESC',
 232                                 'LIMIT' => 1 ) );
 233                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 234
 235                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 236                         array( 'rev_id', 'rev_timestamp' ),
 237                         array(
 238                                 'page_namespace' => $this->title->getNamespace(),
 239                                 'page_title' => $this->title->getDBkey(),
 240                                 'page_id = rev_page',
 241                                 'rev_timestamp < ' .
 242                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 243                         __METHOD__,
 244                         array(
 245                                 'ORDER BY' => 'rev_timestamp DESC',
 246                                 'LIMIT' => 1 ) );
 247                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 248                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 249
 250                 if( $prevLive && $prevLive > $prevDeleted ) {
 251                         // Most prior revision was live
 252                         return Revision::newFromId( $prevLiveId );
 253                 } elseif( $prevDeleted ) {
 254                         // Most prior revision was deleted
 255                         return $this->getRevision( $prevDeleted );
 256                 } else {
 257                         // No prior revision on this page.
 258                         return null;
 259                 }
 260         }
 261
 262         /**
 263          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 264          */
 265         function getTextFromRow( $row ) {
 266                 if( is_null( $row->ar_text_id ) ) {
 267                         // An old row from MediaWiki 1.4 or previous.
 268                         // Text is embedded in this row in classic compression format.
 269                         return Revision::getRevisionText( $row, "ar_" );
 270                 } else {
 271                         // New-style: keyed to the text storage backend.
 272                         $dbr = wfGetDB( DB_SLAVE );
 273                         $text = $dbr->selectRow( 'text',
 274                                 array( 'old_text', 'old_flags' ),
 275                                 array( 'old_id' => $row->ar_text_id ),
 276                                 __METHOD__ );
 277                         return Revision::getRevisionText( $text );
 278                 }
 279         }
 280
 281
 282         /**
 283          * Fetch (and decompress if necessary) the stored text of the most
 284          * recently edited deleted revision of the page.
 285          *
 286          * If there are no archived revisions for the page, returns NULL.
 287          *
 288          * @return string
 289          */
 290         function getLastRevisionText() {
 291                 $dbr = wfGetDB( DB_SLAVE );
 292                 $row = $dbr->selectRow( 'archive',
 293                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 294                         array( 'ar_namespace' => $this->title->getNamespace(),
 295                                'ar_title' => $this->title->getDBkey() ),
 296                         'PageArchive::getLastRevisionText',
 297                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 298                 if( $row ) {
 299                         return $this->getTextFromRow( $row );
 300                 } else {
 301                         return NULL;
 302                 }
 303         }
 304
 305         /**
 306          * Quick check if any archived revisions are present for the page.
 307          * @return bool
 308          */
 309         function isDeleted() {
 310                 $dbr = wfGetDB( DB_SLAVE );
 311                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 312                         array( 'ar_namespace' => $this->title->getNamespace(),
 313                                'ar_title' => $this->title->getDBkey() ) );
 314                 return ($n > 0);
 315         }
 316
 317         /**
 318          * Restore the given (or all) text and file revisions for the page.
 319          * Once restored, the items will be removed from the archive tables.
 320          * The deletion log will be updated with an undeletion notice.
 321          *
 322          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 323          * @param string $comment
 324          * @param array $fileVersions
 325          * @param bool $Unsuppress
 326          *
 327          * @return array(number of file revisions restored, number of image revisions restored, log message)
 328          * on success, false on failure
 329          */
 330         function undelete( $timestamps, $comment = '', $fileVersions = array(), $Unsuppress = false ) {
 331                 // If both the set of text revisions and file revisions are empty,
 332                 // restore everything. Otherwise, just restore the requested items.
 333                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 334
 335                 $restoreText = $restoreAll || !empty( $timestamps );
 336                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 337
 338                 if( $restoreFiles && $this->title->getNamespace() == NS_IMAGE ) {
 339                         $img = wfLocalFile( $this->title );
 340                         $this->fileStatus = $img->restore( $fileVersions, $Unsuppress );
 341                         $filesRestored = $this->fileStatus->successCount;
 342                 } else {
 343                         $filesRestored = 0;
 344                 }
 345
 346                 if( $restoreText ) {
 347                         $textRestored = $this->undeleteRevisions( $timestamps, $Unsuppress );
 348                         if($textRestored === false) // It must be one of UNDELETE_*
 349                                 return false;
 350                 } else {
 351                         $textRestored = 0;
 352                 }
 353
 354                 // Touch the log!
 355                 global $wgContLang;
 356                 $log = new LogPage( 'delete' );
 357
 358                 if( $textRestored && $filesRestored ) {
 359                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 360                                 $wgContLang->formatNum( $textRestored ),
 361                                 $wgContLang->formatNum( $filesRestored ) );
 362                 } elseif( $textRestored ) {
 363                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 364                                 $wgContLang->formatNum( $textRestored ) );
 365                 } elseif( $filesRestored ) {
 366                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 367                                 $wgContLang->formatNum( $filesRestored ) );
 368                 } else {
 369                         wfDebug( "Undelete: nothing undeleted...\n" );
 370                         return false;
 371                 }
 372
 373                 if( trim( $comment ) != '' )
 374                         $reason .= ": {$comment}";
 375                 $log->addEntry( 'restore', $this->title, $reason );
 376
 377                 return array($textRestored, $filesRestored, $reason);
 378         }
 379
 380         /**
 381          * This is the meaty bit -- restores archived revisions of the given page
 382          * to the cur/old tables. If the page currently exists, all revisions will
 383          * be stuffed into old, otherwise the most recent will go into cur.
 384          *
 385          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 386          * @param string $comment
 387          * @param array $fileVersions
 388          * @param bool $Unsuppress, remove all ar_deleted/fa_deleted restrictions of seletected revs
 389          *
 390          * @return mixed number of revisions restored or false on failure
 391          */
 392         private function undeleteRevisions( $timestamps, $Unsuppress = false ) {
 393                 if ( wfReadOnly() )
 394                         return false;
 395                 $restoreAll = empty( $timestamps );
 396
 397                 $dbw = wfGetDB( DB_MASTER );
 398
 399                 # Does this page already exist? We'll have to update it...
 400                 $article = new Article( $this->title );
 401                 $options = 'FOR UPDATE';
 402                 $page = $dbw->selectRow( 'page',
 403                         array( 'page_id', 'page_latest' ),
 404                         array( 'page_namespace' => $this->title->getNamespace(),
 405                                'page_title'     => $this->title->getDBkey() ),
 406                         __METHOD__,
 407                         $options );
 408                 if( $page ) {
 409                         $makepage = false;
 410                         # Page already exists. Import the history, and if necessary
 411                         # we'll update the latest revision field in the record.
 412                         $newid             = 0;
 413                         $pageId            = $page->page_id;
 414                         $previousRevId     = $page->page_latest;
 415                         # Get the time span of this page
 416                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 417                                 array( 'rev_id' => $previousRevId ),
 418                                 __METHOD__ );
 419                         if( $previousTimestamp === false ) {
 420                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 421                                 return 0;
 422                         }
 423                 } else {
 424                         # Have to create a new article...
 425                         $makepage = true;
 426                         $previousRevId = 0;
 427                         $previousTimestamp = 0;
 428                 }
 429
 430                 if( $restoreAll ) {
 431                         $oldones = '1 = 1'; # All revisions...
 432                 } else {
 433                         $oldts = implode( ',',
 434                                 array_map( array( &$dbw, 'addQuotes' ),
 435                                         array_map( array( &$dbw, 'timestamp' ),
 436                                                 $timestamps ) ) );
 437
 438                         $oldones = "ar_timestamp IN ( {$oldts} )";
 439                 }
 440
 441                 /**
 442                  * Select each archived revision...
 443                  */
 444                 $result = $dbw->select( 'archive',
 445                         /* fields */ array(
 446                                 'ar_rev_id',
 447                                 'ar_text',
 448                                 'ar_comment',
 449                                 'ar_user',
 450                                 'ar_user_text',
 451                                 'ar_timestamp',
 452                                 'ar_minor_edit',
 453                                 'ar_flags',
 454                                 'ar_text_id',
 455                                 'ar_deleted',
 456                                 'ar_page_id',
 457                                 'ar_len' ),
 458                         /* WHERE */ array(
 459                                 'ar_namespace' => $this->title->getNamespace(),
 460                                 'ar_title'     => $this->title->getDBkey(),
 461                                 $oldones ),
 462                         __METHOD__,
 463                         /* options */ array(
 464                                 'ORDER BY' => 'ar_timestamp' )
 465                         );
 466                 $ret = $dbw->resultObject( $result );
 467
 468                 $rev_count = $dbw->numRows( $result );
 469                 if( $rev_count ) {
 470                         # We need to seek around as just using DESC in the ORDER BY
 471                         # would leave the revisions inserted in the wrong order
 472                         $first = $ret->fetchObject();
 473                         $ret->seek( $rev_count - 1 );
 474                         $last = $ret->fetchObject();
 475                         // We don't handle well changing the top revision's settings
 476                         if( !$Unsuppress && $last->ar_deleted && $last->ar_timestamp > $previousTimestamp ) {
 477                                 wfDebug( __METHOD__.": restoration would result in a deleted top revision\n" );
 478                                 return false;
 479                         }
 480                         $ret->seek( 0 );
 481                 }
 482
 483                 if( $makepage ) {
 484                         $newid  = $article->insertOn( $dbw );
 485                         $pageId = $newid;
 486                 }
 487
 488                 $revision = null;
 489                 $restored = 0;
 490
 491                 while( $row = $ret->fetchObject() ) {
 492                         if( $row->ar_text_id ) {
 493                                 // Revision was deleted in 1.5+; text is in
 494                                 // the regular text table, use the reference.
 495                                 // Specify null here so the so the text is
 496                                 // dereferenced for page length info if needed.
 497                                 $revText = null;
 498                         } else {
 499                                 // Revision was deleted in 1.4 or earlier.
 500                                 // Text is squashed into the archive row, and
 501                                 // a new text table entry will be created for it.
 502                                 $revText = Revision::getRevisionText( $row, 'ar_' );
 503                         }
 504                         $revision = new Revision( array(
 505                                 'page'       => $pageId,
 506                                 'id'         => $row->ar_rev_id,
 507                                 'text'       => $revText,
 508                                 'comment'    => $row->ar_comment,
 509                                 'user'       => $row->ar_user,
 510                                 'user_text'  => $row->ar_user_text,
 511                                 'timestamp'  => $row->ar_timestamp,
 512                                 'minor_edit' => $row->ar_minor_edit,
 513                                 'text_id'    => $row->ar_text_id,
 514                                 'deleted'        => $Unsuppress ? 0 : $row->ar_deleted,
 515                                 'len'        => $row->ar_len
 516                                 ) );
 517                         $revision->insertOn( $dbw );
 518                         $restored++;
 519
 520                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 521                 }
 522                 // Was anything restored at all?
 523                 if($restored == 0)
 524                         return 0;
 525
 526                 if( $revision ) {
 527                         // Attach the latest revision to the page...
 528                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 529
 530                         if( $newid || $wasnew ) {
 531                                 // Update site stats, link tables, etc
 532                                 $article->createUpdates( $revision );
 533                         }
 534
 535                         if( $newid ) {
 536                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true ) );
 537                                 Article::onArticleCreate( $this->title );
 538                         } else {
 539                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false ) );
 540                                 Article::onArticleEdit( $this->title );
 541                         }
 542
 543                         if( $this->title->getNamespace() == NS_IMAGE ) {
 544                                 $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 545                                 $update->doUpdate();
 546                         }
 547                 } else {
 548                         // Revision couldn't be created. This is very weird
 549                         return self::UNDELETE_UNKNOWNERR;
 550                 }
 551
 552                 # Now that it's safely stored, take it out of the archive
 553                 $dbw->delete( 'archive',
 554                         /* WHERE */ array(
 555                                 'ar_namespace' => $this->title->getNamespace(),
 556                                 'ar_title' => $this->title->getDBkey(),
 557                                 $oldones ),
 558                         __METHOD__ );
 559
 560                 return $restored;
 561         }
 562
 563         function getFileStatus() { return $this->fileStatus; }
 564 }
 565
 566 /**
 567  * The HTML form for Special:Undelete, which allows users with the appropriate
 568  * permissions to view and restore deleted content.
 569  * @addtogroup SpecialPage
 570  */
 571 class UndeleteForm {
 572         var $mAction, $mTarget, $mTimestamp, $mRestore, $mTargetObj;
 573         var $mTargetTimestamp, $mAllowed, $mComment;
 574
 575         function UndeleteForm( $request, $par = "" ) {
 576                 global $wgUser;
 577                 $this->mAction = $request->getVal( 'action' );
 578                 $this->mTarget = $request->getVal( 'target' );
 579                 $this->mSearchPrefix = $request->getText( 'prefix' );
 580                 $time = $request->getVal( 'timestamp' );
 581                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 582                 $this->mFile = $request->getVal( 'file' );
 583
 584                 $posted = $request->wasPosted() &&
 585                         $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 586                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 587                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 588                 $this->mDiff = $request->getCheck( 'diff' );
 589                 $this->mComment = $request->getText( 'wpComment' );
 590                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'oversight' );
 591
 592                 if( $par != "" ) {
 593                         $this->mTarget = $par;
 594                 }
 595                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 596                         $this->mAllowed = true;
 597                 } else {
 598                         $this->mAllowed = false;
 599                         $this->mTimestamp = '';
 600                         $this->mRestore = false;
 601                 }
 602                 if ( $this->mTarget !== "" ) {
 603                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 604                 } else {
 605                         $this->mTargetObj = NULL;
 606                 }
 607                 if( $this->mRestore ) {
 608                         $timestamps = array();
 609                         $this->mFileVersions = array();
 610                         foreach( $_REQUEST as $key => $val ) {
 611                                 $matches = array();
 612                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 613                                         array_push( $timestamps, $matches[1] );
 614                                 }
 615
 616                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 617                                         $this->mFileVersions[] = intval( $matches[1] );
 618                                 }
 619                         }
 620                         rsort( $timestamps );
 621                         $this->mTargetTimestamp = $timestamps;
 622                 }
 623         }
 624
 625         function execute() {
 626                 global $wgOut, $wgUser;
 627                 if ( $this->mAllowed ) {
 628                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 629                 } else {
 630                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 631                 }
 632
 633                 if( is_null( $this->mTargetObj ) ) {
 634                 # Not all users can just browse every deleted page from the list
 635                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 636                                 $this->showSearchForm();
 637
 638                                 # List undeletable articles
 639                                 if( $this->mSearchPrefix ) {
 640                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 641                                         $this->showList( $result );
 642                                 }
 643                         } else {
 644                                 $wgOut->addWikiText( wfMsgHtml( 'undelete-header' ) );
 645                         }
 646                         return;
 647                 }
 648                 if( $this->mTimestamp !== '' ) {
 649                         return $this->showRevision( $this->mTimestamp );
 650                 }
 651                 if( $this->mFile !== null ) {
 652                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 653                         // Check if user is allowed to see this file
 654                         if( !$file->userCan( File::DELETED_FILE ) ) {
 655                                 $wgOut->permissionRequired( 'hiderevision' );
 656                                 return false;
 657                         } else {
 658                                 return $this->showFile( $this->mFile );
 659                         }
 660                 }
 661                 if( $this->mRestore && $this->mAction == "submit" ) {
 662                         return $this->undelete();
 663                 }
 664                 return $this->showHistory();
 665         }
 666
 667         function showSearchForm() {
 668                 global $wgOut, $wgScript;
 669                 $wgOut->addWikiMsg( 'undelete-header' );
 670
 671                 $wgOut->addHtml(
 672                         Xml::openElement( 'form', array(
 673                                 'method' => 'get',
 674                                 'action' => $wgScript ) ) .
 675                         '<fieldset>' .
 676                         Xml::element( 'legend', array(),
 677                                 wfMsg( 'undelete-search-box' ) ) .
 678                         Xml::hidden( 'title',
 679                                 SpecialPage::getTitleFor( 'Undelete' )->getPrefixedDbKey() ) .
 680                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 681                                 'prefix', 'prefix', 20,
 682                                 $this->mSearchPrefix ) .
 683                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 684                         '</fieldset>' .
 685                         '</form>' );
 686         }
 687
 688         // Generic list of deleted pages
 689         private function showList( $result ) {
 690                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 691
 692                 if( $result->numRows() == 0 ) {
 693                         $wgOut->addWikiMsg( 'undelete-no-results' );
 694                         return;
 695                 }
 696
 697                 $wgOut->addWikiMsg( "undeletepagetext" );
 698
 699                 $sk = $wgUser->getSkin();
 700                 $undelete = SpecialPage::getTitleFor( 'Undelete' );
 701                 $wgOut->addHTML( "<ul>\n" );
 702                 while( $row = $result->fetchObject() ) {
 703                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 704                         $link = $sk->makeKnownLinkObj( $undelete, htmlspecialchars( $title->getPrefixedText() ), 'target=' . $title->getPrefixedUrl() );
 705                         #$revs = wfMsgHtml( 'undeleterevisions', $wgLang->formatNum( $row->count ) );
 706                         $revs = wfMsgExt( 'undeleterevisions',
 707                                 array( 'parseinline' ),
 708                                 $wgLang->formatNum( $row->count ) );
 709                         $wgOut->addHtml( "<li>{$link} ({$revs})</li>\n" );
 710                 }
 711                 $result->free();
 712                 $wgOut->addHTML( "</ul>\n" );
 713
 714                 return true;
 715         }
 716
 717         private function showRevision( $timestamp ) {
 718                 global $wgLang, $wgUser, $wgOut;
 719                 $self = SpecialPage::getTitleFor( 'Undelete' );
 720                 $skin = $wgUser->getSkin();
 721
 722                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 723
 724                 $archive = new PageArchive( $this->mTargetObj );
 725                 $rev = $archive->getRevision( $timestamp );
 726
 727                 if( !$rev ) {
 728                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 729                         return;
 730                 }
 731
 732                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 733                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 734                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 735                                 return;
 736                         } else {
 737                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 738                                 $wgOut->addHTML( '<br/>' );
 739                                 // and we are allowed to see...
 740                         }
 741                 }
 742
 743                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 744
 745                 $link = $skin->makeKnownLinkObj(
 746                         SpecialPage::getTitleFor( 'Undelete', $this->mTargetObj->getPrefixedDBkey() ),
 747                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 748                 );
 749                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 750                 $user = $skin->revUserTools( $rev );
 751
 752                 if( $this->mDiff ) {
 753                         $previousRev = $archive->getPreviousRevision( $timestamp );
 754                         if( $previousRev ) {
 755                                 $this->showDiff( $previousRev, $rev );
 756                                 if( $wgUser->getOption( 'diffonly' ) ) {
 757                                         return;
 758                                 } else {
 759                                         $wgOut->addHtml( '<hr />' );
 760                                 }
 761                         } else {
 762                                 $wgOut->addHtml( wfMsgHtml( 'undelete-nodiff' ) );
 763                         }
 764                 }
 765
 766                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'undelete-revision', $link, $time, $user ) . '</p>' );
 767
 768                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 769
 770                 if( $this->mPreview ) {
 771                         $wgOut->addHtml( "<hr />\n" );
 772                         $wgOut->addWikiTextTitleTidy( $rev->revText(), $this->mTargetObj, false );
 773                 }
 774
 775                 $wgOut->addHtml(
 776                         wfElement( 'textarea', array(
 777                                         'readonly' => 'readonly',
 778                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 779                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 780                                 $rev->revText() . "\n" ) .
 781                         wfOpenElement( 'div' ) .
 782                         wfOpenElement( 'form', array(
 783                                 'method' => 'post',
 784                                 'action' => $self->getLocalURL( "action=submit" ) ) ) .
 785                         wfElement( 'input', array(
 786                                 'type' => 'hidden',
 787                                 'name' => 'target',
 788                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 789                         wfElement( 'input', array(
 790                                 'type' => 'hidden',
 791                                 'name' => 'timestamp',
 792                                 'value' => $timestamp ) ) .
 793                         wfElement( 'input', array(
 794                                 'type' => 'hidden',
 795                                 'name' => 'wpEditToken',
 796                                 'value' => $wgUser->editToken() ) ) .
 797                         wfElement( 'input', array(
 798                                 'type' => 'submit',
 799                                 'name' => 'preview',
 800                                 'value' => wfMsg( 'showpreview' ) ) ) .
 801                         wfElement( 'input', array(
 802                                 'name' => 'diff',
 803                                 'type' => 'submit',
 804                                 'value' => wfMsg( 'showdiff' ) ) ) .
 805                         wfCloseElement( 'form' ) .
 806                         wfCloseElement( 'div' ) );
 807         }
 808
 809         /**
 810          * Build a diff display between this and the previous either deleted
 811          * or non-deleted edit.
 812          * @param Revision $previousRev
 813          * @param Revision $currentRev
 814          * @return string HTML
 815          */
 816         function showDiff( $previousRev, $currentRev ) {
 817                 global $wgOut, $wgUser;
 818
 819                 $diffEngine = new DifferenceEngine();
 820                 $diffEngine->showDiffStyle();
 821                 $wgOut->addHtml(
 822                         "<div>" .
 823                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 824                         "<col class='diff-marker' />" .
 825                         "<col class='diff-content' />" .
 826                         "<col class='diff-marker' />" .
 827                         "<col class='diff-content' />" .
 828                         "<tr>" .
 829                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 830                                 $this->diffHeader( $previousRev ) .
 831                                 "</td>" .
 832                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 833                                 $this->diffHeader( $currentRev ) .
 834                                 "</td>" .
 835                         "</tr>" .
 836                         $diffEngine->generateDiffBody(
 837                                 $previousRev->getText(), $currentRev->getText() ) .
 838                         "</table>" .
 839                         "</div>\n" );
 840
 841         }
 842
 843         private function diffHeader( $rev ) {
 844                 global $wgUser, $wgLang, $wgLang;
 845                 $sk = $wgUser->getSkin();
 846                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 847                 if( $isDeleted ) {
 848                         /// @fixme $rev->getTitle() is null for deleted revs...?
 849                         $targetPage = SpecialPage::getTitleFor( 'Undelete' );
 850                         $targetQuery = 'target=' .
 851                                 $this->mTargetObj->getPrefixedUrl() .
 852                                 '&timestamp=' .
 853                                 wfTimestamp( TS_MW, $rev->getTimestamp() );
 854                 } else {
 855                         /// @fixme getId() may return non-zero for deleted revs...
 856                         $targetPage = $rev->getTitle();
 857                         $targetQuery = 'oldid=' . $rev->getId();
 858                 }
 859                 return
 860                         '<div id="mw-diff-otitle1"><strong>' .
 861                                 $sk->makeLinkObj( $targetPage,
 862                                         wfMsgHtml( 'revisionasof',
 863                                                 $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 864                                         $targetQuery ) .
 865                                 ( $isDeleted ? ' ' . wfMsgHtml( 'deletedrev' ) : '' ) .
 866                         '</strong></div>' .
 867                         '<div id="mw-diff-otitle2">' .
 868                                 $sk->revUserTools( $rev ) . '<br/>' .
 869                         '</div>' .
 870                         '<div id="mw-diff-otitle3">' .
 871                                 $sk->revComment( $rev ) . '<br/>' .
 872                         '</div>';
 873         }
 874
 875         /**
 876          * Show a deleted file version requested by the visitor.
 877          */
 878         private function showFile( $key ) {
 879                 global $wgOut, $wgRequest;
 880                 $wgOut->disable();
 881
 882                 # We mustn't allow the output to be Squid cached, otherwise
 883                 # if an admin previews a deleted image, and it's cached, then
 884                 # a user without appropriate permissions can toddle off and
 885                 # nab the image, and Squid will serve it
 886                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 887                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 888                 $wgRequest->response()->header( 'Pragma: no-cache' );
 889
 890                 $store = FileStore::get( 'deleted' );
 891                 $store->stream( $key );
 892         }
 893
 894         private function showHistory() {
 895                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 896
 897                 $sk = $wgUser->getSkin();
 898                 if( $this->mAllowed ) {
 899                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 900                 } else {
 901                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
 902                 }
 903
 904                 $wgOut->addWikiText( wfMsgHtml( 'undeletepagetitle', $this->mTargetObj->getPrefixedText()) );
 905
 906                 $archive = new PageArchive( $this->mTargetObj );
 907                 /*
 908                 $text = $archive->getLastRevisionText();
 909                 if( is_null( $text ) ) {
 910                         $wgOut->addWikiMsg( "nohistory" );
 911                         return;
 912                 }
 913                 */
 914                 if ( $this->mAllowed ) {
 915                         $wgOut->addWikiMsg( "undeletehistory" );
 916                         $wgOut->addWikiMsg( "undeleterevdel" );
 917                 } else {
 918                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
 919                 }
 920
 921                 # List all stored revisions
 922                 $revisions = $archive->listRevisions();
 923                 $files = $archive->listFiles();
 924
 925                 $haveRevisions = $revisions && $revisions->numRows() > 0;
 926                 $haveFiles = $files && $files->numRows() > 0;
 927
 928                 # Batch existence check on user and talk pages
 929                 if( $haveRevisions ) {
 930                         $batch = new LinkBatch();
 931                         while( $row = $revisions->fetchObject() ) {
 932                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
 933                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
 934                         }
 935                         $batch->execute();
 936                         $revisions->seek( 0 );
 937                 }
 938                 if( $haveFiles ) {
 939                         $batch = new LinkBatch();
 940                         while( $row = $files->fetchObject() ) {
 941                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
 942                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
 943                         }
 944                         $batch->execute();
 945                         $files->seek( 0 );
 946                 }
 947
 948                 if ( $this->mAllowed ) {
 949                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
 950                         $action = $titleObj->getLocalURL( "action=submit" );
 951                         # Start the form here
 952                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
 953                         $wgOut->addHtml( $top );
 954                 }
 955
 956                 # Show relevant lines from the deletion log:
 957                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
 958                 $logViewer = new LogViewer(
 959                         new LogReader(
 960                                 new FauxRequest(
 961                                         array(
 962                                                 'page' => $this->mTargetObj->getPrefixedText(),
 963                                                 'type' => 'delete'
 964                                         )
 965                                 )
 966                         ), LogViewer::NO_ACTION_LINK
 967                 );
 968                 $logViewer->showList( $wgOut );
 969
 970                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
 971                         # Format the user-visible controls (comment field, submission button)
 972                         # in a nice little table
 973                         $align = $wgContLang->isRtl() ? 'left' : 'right';
 974                         $table =
 975                                 Xml::openElement( 'fieldset' ) .
 976                                 Xml::element( 'legend', null, wfMsg( 'undelete') ).
 977                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
 978                                         "<tr>
 979                                                 <td colspan='2'>" .
 980                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
 981                                                 "</td>
 982                                         </tr>
 983                                         <tr>
 984                                                 <td align='$align'>" .
 985                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
 986                                                 "</td>
 987                                                 <td>" .
 988                                                         Xml::input( 'wpComment', 50, $this->mComment ) .
 989                                                 "</td>
 990                                         </tr>
 991                                         <tr>
 992                                                 <td>&nbsp;</td>
 993                                                 <td>" .
 994                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) .
 995                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) .
 996                                                 "</td>
 997                                         </tr>
 998                                         <tr>
 999                                                 <td>&nbsp;</td>
1000                                                 <td>" .
1001                                                         Xml::check( 'wpUnsuppress', $this->mUnsuppress, array('id' => 'mw-undelete-unsupress') ) . ' ' .
1002                                                         Xml::label( wfMsgHtml('revdelete-unsuppress'), 'mw-undelete-unsupress' ) .
1003                                                 "</td>
1004                                         </tr>" .
1005                                 Xml::closeElement( 'table' ) .
1006                                 Xml::closeElement( 'fieldset' );
1007
1008                         $wgOut->addHtml( $table );
1009                 }
1010
1011                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1012
1013                 if( $haveRevisions ) {
1014                         # The page's stored (deleted) history:
1015                         $wgOut->addHTML("<ul>");
1016                         $target = urlencode( $this->mTarget );
1017                         $remaining = $revisions->numRows();
1018                         $earliestLiveTime = $this->getEarliestTime( $this->mTargetObj );
1019
1020                         while( $row = $revisions->fetchObject() ) {
1021                                 $remaining--;
1022                                 $wgOut->addHTML( $this->formatRevisionRow( $row , $sk ) );
1023                         }
1024                         $revisions->free();
1025                         $wgOut->addHTML("</ul>");
1026                 } else {
1027                         $wgOut->addWikiMsg( "nohistory" );
1028                 }
1029
1030                 if( $haveFiles ) {
1031                         $wgOut->addHtml( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1032                         $wgOut->addHtml( "<ul>" );
1033                         while( $row = $files->fetchObject() ) {
1034                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1035                         }
1036                         $files->free();
1037                         $wgOut->addHTML( "</ul>" );
1038                 }
1039
1040                 if ( $this->mAllowed ) {
1041                         # Slip in the hidden controls here
1042                         $misc  = Xml::hidden( 'target', $this->mTarget );
1043                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
1044                         $misc .= Xml::closeElement( 'form' );
1045                         $wgOut->addHtml( $misc );
1046                 }
1047
1048                 return true;
1049         }
1050
1051         private function formatRevisionRow( $row, $sk ) {
1052                 global $wgUser, $wgLang;
1053
1054                 $rev = new Revision( array(
1055                                 'page'       => $this->mTargetObj->getArticleId(),
1056                                 'comment'    => $row->ar_comment,
1057                                 'user'       => $row->ar_user,
1058                                 'user_text'  => $row->ar_user_text,
1059                                 'timestamp'  => $row->ar_timestamp,
1060                                 'minor_edit' => $row->ar_minor_edit,
1061                                 'deleted'    => $row->ar_deleted,
1062                                 'len'        => $row->ar_len) );
1063
1064                 $stxt = '';
1065
1066                 if( $this->mAllowed ) {
1067                         $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1068                         $checkBox = Xml::check( "ts$ts" );
1069                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1070                         $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1071                         # Last link
1072                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1073                                 $last = wfMsgHtml('diff');
1074                         } else {
1075                                 $last = $sk->makeKnownLinkObj( $titleObj, wfMsgHtml('diff'),
1076                                 "target=" . $this->mTarget . "&timestamp=" . $row->ar_timestamp . "&diff=prev" );
1077                         }
1078                 } else {
1079                         $checkBox = '';
1080                         $pageLink = $wgLang->timeanddate( $ts, true );
1081                 }
1082                 $userLink = $sk->revUserTools( $rev );
1083
1084                 if(!is_null($size = $row->ar_len)) {
1085                         if($size == 0)
1086                                 $stxt = wfMsgHtml('historyempty');
1087                         else
1088                                 $stxt = wfMsgHtml('historysize', $wgLang->formatNum( $size ) );
1089                 }
1090                 $comment = $sk->revComment( $rev );
1091                 $revdlink = '';
1092                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1093                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1094                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1095                         // If revision was hidden from sysops
1096                                 $del = wfMsgHtml('rev-delundel');
1097                         } else {
1098                                 $del = $sk->makeKnownLinkObj( $revdel,
1099                                         wfMsgHtml('rev-delundel'),
1100                                         'target=' . urlencode( $this->mTarget ) .
1101                                         '&artimestamp=' . urlencode( $row->ar_timestamp ) );
1102                                 // Bolden oversighted content
1103                                 if( $rev->isDeleted( Revision::DELETED_RESTRICTED ) )
1104                                         $del = "<strong>$del</strong>";
1105                         }
1106                         $revdlink = "<tt>(<small>$del</small>)</tt>";
1107                 }
1108
1109                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1110         }
1111
1112         private function formatFileRow( $row, $sk ) {
1113                 global $wgUser, $wgLang;
1114
1115                 $file = ArchivedFile::newFromRow( $row );
1116
1117                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1118                 if( $this->mAllowed && $row->fa_storage_key ) {
1119                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1120                         $key = urlencode( $row->fa_storage_key );
1121                         $target = urlencode( $this->mTarget );
1122                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1123                         $pageLink = $this->getFileLink( $file, $titleObj, $ts, $key, $sk );
1124                 } else {
1125                         $checkBox = '';
1126                         $pageLink = $wgLang->timeanddate( $ts, true );
1127                 }
1128                 $userLink = $this->getFileUser( $file, $sk );
1129                 $data =
1130                         wfMsgHtml( 'widthheight',
1131                                 $wgLang->formatNum( $row->fa_width ),
1132                                 $wgLang->formatNum( $row->fa_height ) ) .
1133                         ' (' .
1134                         wfMsgHtml( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1135                         ')';
1136                 $comment = $this->getFileComment( $file, $sk );
1137                 $revdlink = '';
1138                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1139                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1140                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1141                         // If revision was hidden from sysops
1142                                 $del = $this->messages['rev-delundel'];
1143                         } else {
1144                                 $del = $sk->makeKnownLinkObj( $revdel,
1145                                         wfMsgHtml('rev-delundel'),
1146                                         'target=' . urlencode( $this->mTarget ) .
1147                                         '&fileid=' . urlencode( $row->fa_id ) );
1148                                 // Bolden oversighted content
1149                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) )
1150                                         $del = "<strong>$del</strong>";
1151                         }
1152                         $revdlink = "<tt>(<small>$del</small>)</tt>";
1153                 }
1154                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1155         }
1156
1157         private function getEarliestTime( $title ) {
1158                 $dbr = wfGetDB( DB_SLAVE );
1159                 if( $title->exists() ) {
1160                         $min = $dbr->selectField( 'revision',
1161                                 'MIN(rev_timestamp)',
1162                                 array( 'rev_page' => $title->getArticleId() ),
1163                                 __METHOD__ );
1164                         return wfTimestampOrNull( TS_MW, $min );
1165                 }
1166                 return null;
1167         }
1168
1169         /**
1170          * Fetch revision text link if it's available to all users
1171          * @return string
1172          */
1173         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1174                 global $wgLang;
1175
1176                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1177                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1178                 } else {
1179                         $link = $sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ), "target={$this->mTarget}&timestamp=$ts" );
1180                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1181                                 $link = '<span class="history-deleted">' . $link . '</span>';
1182                         return $link;
1183                 }
1184         }
1185
1186         /**
1187          * Fetch image view link if it's available to all users
1188          * @return string
1189          */
1190         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1191                 global $wgLang;
1192
1193                 if( !$file->userCan(File::DELETED_FILE) ) {
1194                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1195                 } else {
1196                         $link = $sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ), "target={$this->mTarget}&file=$key" );
1197                         if( $file->isDeleted(File::DELETED_FILE) )
1198                                 $link = '<span class="history-deleted">' . $link . '</span>';
1199                         return $link;
1200                 }
1201         }
1202
1203         /**
1204          * Fetch file's user id if it's available to this user
1205          * @return string
1206          */
1207         function getFileUser( $file, $sk ) {
1208                 if( !$file->userCan(File::DELETED_USER) ) {
1209                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1210                 } else {
1211                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1212                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1213                         if( $file->isDeleted(File::DELETED_USER) )
1214                                 $link = '<span class="history-deleted">' . $link . '</span>';
1215                         return $link;
1216                 }
1217         }
1218
1219         /**
1220          * Fetch file upload comment if it's available to this user
1221          * @return string
1222          */
1223         function getFileComment( $file, $sk ) {
1224                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1225                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1226                 } else {
1227                         $link = $sk->commentBlock( $file->getRawDescription() );
1228                         if( $file->isDeleted(File::DELETED_COMMENT) )
1229                                 $link = '<span class="history-deleted">' . $link . '</span>';
1230                         return $link;
1231                 }
1232         }
1233
1234         function undelete() {
1235                 global $wgOut, $wgUser;
1236                 if ( wfReadOnly() ) {
1237                         $wgOut->readOnlyPage();
1238                         return;
1239                 }
1240                 if( !is_null( $this->mTargetObj ) ) {
1241                         $archive = new PageArchive( $this->mTargetObj );
1242                         $ok = $archive->undelete(
1243                                 $this->mTargetTimestamp,
1244                                 $this->mComment,
1245                                 $this->mFileVersions,
1246                                 $this->mUnsuppress );
1247
1248                         if( is_array($ok) ) {
1249                                 if ( $ok[1] ) // Undeleted file count
1250                                         wfRunHooks( 'FileUndeleteComplete', array(
1251                                                 $this->mTargetObj, $this->mFileVersions,
1252                                                 $wgUser, $this->mComment) );
1253
1254                                 $skin = $wgUser->getSkin();
1255                                 $link = $skin->makeKnownLinkObj( $this->mTargetObj );
1256                                 $wgOut->addHtml( wfMsgWikiHtml( 'undeletedpage', $link ) );
1257                         } else {
1258                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1259                                 $wgOut->addHtml( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1260                         }
1261
1262                         // Show file deletion warnings and errors
1263                         $status = $archive->getFileStatus();
1264                         if( $status && !$status->isGood() ) {
1265                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1266                         }
1267                 } else {
1268                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1269                 }
1270                 return false;
1271         }
1272 }