includes/specials/SpecialUndelete.php

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