includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  * http://www.gnu.org/copyleft/gpl.html
  18  */
  19
  20 /**
  21  * Used to show archived pages and eventually restore them.
  22  * @ingroup 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( __METHOD__ . ' 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          * @param $prefix String: title prefix
  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                         $prefix = $title->getDBkey();
  62                 } else {
  63                         // Prolly won't work too good
  64                         // @todo handle bare namespace names cleanly?
  65                         $ns = 0;
  66                 }
  67                 $conds = array(
  68                         'ar_namespace' => $ns,
  69                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  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_FILE ) {
 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          * @param $timestamp String
 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          *
 169          * @param $timestamp String
 170          * @return Revision
 171          */
 172         function getRevision( $timestamp ) {
 173                 $dbr = wfGetDB( DB_SLAVE );
 174                 $row = $dbr->selectRow( 'archive',
 175                         array(
 176                                 'ar_rev_id',
 177                                 'ar_text',
 178                                 'ar_comment',
 179                                 'ar_user',
 180                                 'ar_user_text',
 181                                 'ar_timestamp',
 182                                 'ar_minor_edit',
 183                                 'ar_flags',
 184                                 'ar_text_id',
 185                                 'ar_deleted',
 186                                 'ar_len' ),
 187                         array( 'ar_namespace' => $this->title->getNamespace(),
 188                                'ar_title' => $this->title->getDBkey(),
 189                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 190                         __METHOD__ );
 191                 if( $row ) {
 192                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 193                 } else {
 194                         return null;
 195                 }
 196         }
 197
 198         /**
 199          * Return the most-previous revision, either live or deleted, against
 200          * the deleted revision given by timestamp.
 201          *
 202          * May produce unexpected results in case of history merges or other
 203          * unusual time issues.
 204          *
 205          * @param $timestamp String
 206          * @return Revision or null
 207          */
 208         function getPreviousRevision( $timestamp ) {
 209                 $dbr = wfGetDB( DB_SLAVE );
 210
 211                 // Check the previous deleted revision...
 212                 $row = $dbr->selectRow( 'archive',
 213                         'ar_timestamp',
 214                         array( 'ar_namespace' => $this->title->getNamespace(),
 215                                'ar_title' => $this->title->getDBkey(),
 216                                'ar_timestamp < ' .
 217                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 218                         __METHOD__,
 219                         array(
 220                                 'ORDER BY' => 'ar_timestamp DESC',
 221                                 'LIMIT' => 1 ) );
 222                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 223
 224                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 225                         array( 'rev_id', 'rev_timestamp' ),
 226                         array(
 227                                 'page_namespace' => $this->title->getNamespace(),
 228                                 'page_title' => $this->title->getDBkey(),
 229                                 'page_id = rev_page',
 230                                 'rev_timestamp < ' .
 231                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 232                         __METHOD__,
 233                         array(
 234                                 'ORDER BY' => 'rev_timestamp DESC',
 235                                 'LIMIT' => 1 ) );
 236                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 237                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 238
 239                 if( $prevLive && $prevLive > $prevDeleted ) {
 240                         // Most prior revision was live
 241                         return Revision::newFromId( $prevLiveId );
 242                 } elseif( $prevDeleted ) {
 243                         // Most prior revision was deleted
 244                         return $this->getRevision( $prevDeleted );
 245                 } else {
 246                         // No prior revision on this page.
 247                         return null;
 248                 }
 249         }
 250
 251         /**
 252          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 253          *
 254          * @param $row Object: database row
 255          * @return Revision
 256          */
 257         function getTextFromRow( $row ) {
 258                 if( is_null( $row->ar_text_id ) ) {
 259                         // An old row from MediaWiki 1.4 or previous.
 260                         // Text is embedded in this row in classic compression format.
 261                         return Revision::getRevisionText( $row, "ar_" );
 262                 } else {
 263                         // New-style: keyed to the text storage backend.
 264                         $dbr = wfGetDB( DB_SLAVE );
 265                         $text = $dbr->selectRow( 'text',
 266                                 array( 'old_text', 'old_flags' ),
 267                                 array( 'old_id' => $row->ar_text_id ),
 268                                 __METHOD__ );
 269                         return Revision::getRevisionText( $text );
 270                 }
 271         }
 272
 273
 274         /**
 275          * Fetch (and decompress if necessary) the stored text of the most
 276          * recently edited deleted revision of the page.
 277          *
 278          * If there are no archived revisions for the page, returns NULL.
 279          *
 280          * @return String
 281          */
 282         function getLastRevisionText() {
 283                 $dbr = wfGetDB( DB_SLAVE );
 284                 $row = $dbr->selectRow( 'archive',
 285                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 286                         array( 'ar_namespace' => $this->title->getNamespace(),
 287                                'ar_title' => $this->title->getDBkey() ),
 288                         __METHOD__,
 289                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 290                 if( $row ) {
 291                         return $this->getTextFromRow( $row );
 292                 } else {
 293                         return null;
 294                 }
 295         }
 296
 297         /**
 298          * Quick check if any archived revisions are present for the page.
 299          *
 300          * @return Boolean
 301          */
 302         function isDeleted() {
 303                 $dbr = wfGetDB( DB_SLAVE );
 304                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 305                         array( 'ar_namespace' => $this->title->getNamespace(),
 306                                'ar_title' => $this->title->getDBkey() ) );
 307                 return ($n > 0);
 308         }
 309
 310         /**
 311          * Restore the given (or all) text and file revisions for the page.
 312          * Once restored, the items will be removed from the archive tables.
 313          * The deletion log will be updated with an undeletion notice.
 314          *
 315          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 316          * @param $comment String
 317          * @param $fileVersions Array
 318          * @param $unsuppress Boolean
 319          *
 320          * @return array(number of file revisions restored, number of image revisions restored, log message)
 321          * on success, false on failure
 322          */
 323         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 324                 // If both the set of text revisions and file revisions are empty,
 325                 // restore everything. Otherwise, just restore the requested items.
 326                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 327
 328                 $restoreText = $restoreAll || !empty( $timestamps );
 329                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 330
 331                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 332                         $img = wfLocalFile( $this->title );
 333                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 334                         $filesRestored = $this->fileStatus->successCount;
 335                 } else {
 336                         $filesRestored = 0;
 337                 }
 338
 339                 if( $restoreText ) {
 340                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 341                         if($textRestored === false) // It must be one of UNDELETE_*
 342                                 return false;
 343                 } else {
 344                         $textRestored = 0;
 345                 }
 346
 347                 // Touch the log!
 348                 global $wgContLang;
 349                 $log = new LogPage( 'delete' );
 350
 351                 if( $textRestored && $filesRestored ) {
 352                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 353                                 $wgContLang->formatNum( $textRestored ),
 354                                 $wgContLang->formatNum( $filesRestored ) );
 355                 } elseif( $textRestored ) {
 356                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 357                                 $wgContLang->formatNum( $textRestored ) );
 358                 } elseif( $filesRestored ) {
 359                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 360                                 $wgContLang->formatNum( $filesRestored ) );
 361                 } else {
 362                         wfDebug( "Undelete: nothing undeleted...\n" );
 363                         return false;
 364                 }
 365
 366                 if( trim( $comment ) != '' )
 367                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 368                 $log->addEntry( 'restore', $this->title, $reason );
 369
 370                 return array($textRestored, $filesRestored, $reason);
 371         }
 372
 373         /**
 374          * This is the meaty bit -- restores archived revisions of the given page
 375          * to the cur/old tables. If the page currently exists, all revisions will
 376          * be stuffed into old, otherwise the most recent will go into cur.
 377          *
 378          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 379          * @param $comment String
 380          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 381          *
 382          * @return Mixed: number of revisions restored or false on failure
 383          */
 384         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 385                 if ( wfReadOnly() )
 386                         return false;
 387                 $restoreAll = empty( $timestamps );
 388
 389                 $dbw = wfGetDB( DB_MASTER );
 390
 391                 # Does this page already exist? We'll have to update it...
 392                 $article = new Article( $this->title );
 393                 $options = 'FOR UPDATE'; // lock page
 394                 $page = $dbw->selectRow( 'page',
 395                         array( 'page_id', 'page_latest' ),
 396                         array( 'page_namespace' => $this->title->getNamespace(),
 397                                'page_title'     => $this->title->getDBkey() ),
 398                         __METHOD__,
 399                         $options
 400                 );
 401                 if( $page ) {
 402                         $makepage = false;
 403                         # Page already exists. Import the history, and if necessary
 404                         # we'll update the latest revision field in the record.
 405                         $newid             = 0;
 406                         $pageId            = $page->page_id;
 407                         $previousRevId    = $page->page_latest;
 408                         # Get the time span of this page
 409                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 410                                 array( 'rev_id' => $previousRevId ),
 411                                 __METHOD__ );
 412                         if( $previousTimestamp === false ) {
 413                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 414                                 return 0;
 415                         }
 416                 } else {
 417                         # Have to create a new article...
 418                         $makepage = true;
 419                         $previousRevId = 0;
 420                         $previousTimestamp = 0;
 421                 }
 422
 423                 if( $restoreAll ) {
 424                         $oldones = '1 = 1'; # All revisions...
 425                 } else {
 426                         $oldts = implode( ',',
 427                                 array_map( array( &$dbw, 'addQuotes' ),
 428                                         array_map( array( &$dbw, 'timestamp' ),
 429                                                 $timestamps ) ) );
 430
 431                         $oldones = "ar_timestamp IN ( {$oldts} )";
 432                 }
 433
 434                 /**
 435                  * Select each archived revision...
 436                  */
 437                 $result = $dbw->select( 'archive',
 438                         /* fields */ array(
 439                                 'ar_rev_id',
 440                                 'ar_text',
 441                                 'ar_comment',
 442                                 'ar_user',
 443                                 'ar_user_text',
 444                                 'ar_timestamp',
 445                                 'ar_minor_edit',
 446                                 'ar_flags',
 447                                 'ar_text_id',
 448                                 'ar_deleted',
 449                                 'ar_page_id',
 450                                 'ar_len' ),
 451                         /* WHERE */ array(
 452                                 'ar_namespace' => $this->title->getNamespace(),
 453                                 'ar_title'     => $this->title->getDBkey(),
 454                                 $oldones ),
 455                         __METHOD__,
 456                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 457                 );
 458                 $ret = $dbw->resultObject( $result );
 459                 $rev_count = $dbw->numRows( $result );
 460                 if( !$rev_count ) {
 461                         wfDebug( __METHOD__.": no revisions to restore\n" );
 462                         return false; // ???
 463                 }
 464
 465                 $ret->seek( $rev_count - 1 ); // move to last
 466                 $row = $ret->fetchObject(); // get newest archived rev
 467                 $ret->seek( 0 ); // move back
 468
 469                 if( $makepage ) {
 470                         // Check the state of the newest to-be version...
 471                         if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 472                                 return false; // we can't leave the current revision like this!
 473                         }
 474                         // Safe to insert now...
 475                         $newid  = $article->insertOn( $dbw );
 476                         $pageId = $newid;
 477                 } else {
 478                         // Check if a deleted revision will become the current revision...
 479                         if( $row->ar_timestamp > $previousTimestamp ) {
 480                                 // Check the state of the newest to-be version...
 481                                 if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 482                                         return false; // we can't leave the current revision like this!
 483                                 }
 484                         }
 485                 }
 486
 487                 $revision = null;
 488                 $restored = 0;
 489
 490                 while( $row = $ret->fetchObject() ) {
 491                         // Check for key dupes due to shitty archive integrity.
 492                         if( $row->ar_rev_id ) {
 493                                 $exists = $dbw->selectField( 'revision', '1', array('rev_id' => $row->ar_rev_id), __METHOD__ );
 494                                 if( $exists ) continue; // don't throw DB errors
 495                         }
 496                         // Insert one revision at a time...maintaining deletion status
 497                         // unless we are specifically removing all restrictions...
 498                         $revision = Revision::newFromArchiveRow( $row,
 499                                 array(
 500                                         'page' => $pageId,
 501                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 502                                 ) );
 503
 504                         $revision->insertOn( $dbw );
 505                         $restored++;
 506
 507                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 508                 }
 509                 # Now that it's safely stored, take it out of the archive
 510                 $dbw->delete( 'archive',
 511                         /* WHERE */ array(
 512                                 'ar_namespace' => $this->title->getNamespace(),
 513                                 'ar_title' => $this->title->getDBkey(),
 514                                 $oldones ),
 515                         __METHOD__ );
 516
 517                 // Was anything restored at all?
 518                 if( $restored == 0 )
 519                         return 0;
 520
 521                 if( $revision ) {
 522                         // Attach the latest revision to the page...
 523                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 524                         if( $newid || $wasnew ) {
 525                                 // Update site stats, link tables, etc
 526                                 $article->createUpdates( $revision );
 527                         }
 528
 529                         if( $newid ) {
 530                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true, $comment ) );
 531                                 Article::onArticleCreate( $this->title );
 532                         } else {
 533                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false, $comment ) );
 534                                 Article::onArticleEdit( $this->title );
 535                         }
 536
 537                         if( $this->title->getNamespace() == NS_FILE ) {
 538                                 $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 539                                 $update->doUpdate();
 540                         }
 541                 } else {
 542                         // Revision couldn't be created. This is very weird
 543                         return self::UNDELETE_UNKNOWNERR;
 544                 }
 545
 546                 return $restored;
 547         }
 548
 549         function getFileStatus() { return $this->fileStatus; }
 550 }
 551
 552 /**
 553  * Special page allowing users with the appropriate permissions to view
 554  * and restore deleted content.
 555  *
 556  * @ingroup SpecialPage
 557  */
 558 class UndeleteForm extends SpecialPage {
 559         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj;
 560         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 561
 562         function __construct( $request = null ) {
 563                 parent::__construct( 'Undelete', 'deletedhistory' );
 564
 565                 if ( $request === null ) {
 566                         global $wgRequest;
 567                         $this->mRequest = $wgRequest;
 568                 } else {
 569                         $this->mRequest = $request;
 570                 }
 571         }
 572
 573         function loadRequest() {
 574                 global $wgUser;
 575                 $this->mAction = $this->mRequest->getVal( 'action' );
 576                 $this->mTarget = $this->mRequest->getVal( 'target' );
 577                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 578                 $time = $this->mRequest->getVal( 'timestamp' );
 579                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 580                 $this->mFile = $this->mRequest->getVal( 'file' );
 581
 582                 $posted = $this->mRequest->wasPosted() &&
 583                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 584                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 585                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 586                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 587                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 588                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 589                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 590                 $this->mToken = $this->mRequest->getVal( 'token' );
 591
 592                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 593                         $this->mAllowed = true; // user can restore
 594                         $this->mCanView = true; // user can view content
 595                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 596                         $this->mAllowed = false; // user cannot restore
 597                         $this->mCanView = true; // user can view content
 598                 }  else { // user can only view the list of revisions
 599                         $this->mAllowed = false;
 600                         $this->mCanView = false;
 601                         $this->mTimestamp = '';
 602                         $this->mRestore = false;
 603                 }
 604
 605                 if( $this->mRestore || $this->mInvert ) {
 606                         $timestamps = array();
 607                         $this->mFileVersions = array();
 608                         foreach( $_REQUEST as $key => $val ) {
 609                                 $matches = array();
 610                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 611                                         array_push( $timestamps, $matches[1] );
 612                                 }
 613
 614                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 615                                         $this->mFileVersions[] = intval( $matches[1] );
 616                                 }
 617                         }
 618                         rsort( $timestamps );
 619                         $this->mTargetTimestamp = $timestamps;
 620                 }
 621         }
 622
 623         function execute( $par ) {
 624                 global $wgOut, $wgUser;
 625
 626                 $this->setHeaders();
 627                 if ( !$this->userCanExecute( $wgUser ) ) {
 628                         $this->displayRestrictionError();
 629                         return;
 630                 }
 631                 $this->outputHeader();
 632
 633                 $this->loadRequest();
 634
 635                 if ( $this->mAllowed ) {
 636                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 637                 } else {
 638                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 639                 }
 640
 641                 if( $par != '' ) {
 642                         $this->mTarget = $par;
 643                 }
 644                 if ( $this->mTarget !== '' ) {
 645                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 646                 } else {
 647                         $this->mTargetObj = null;
 648                 }
 649
 650                 if( is_null( $this->mTargetObj ) ) {
 651                 # Not all users can just browse every deleted page from the list
 652                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 653                                 $this->showSearchForm();
 654
 655                                 # List undeletable articles
 656                                 if( $this->mSearchPrefix ) {
 657                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 658                                         $this->showList( $result );
 659                                 }
 660                         } else {
 661                                 $wgOut->addWikiMsg( 'undelete-header' );
 662                         }
 663                         return;
 664                 }
 665                 if( $this->mTimestamp !== '' ) {
 666                         return $this->showRevision( $this->mTimestamp );
 667                 }
 668                 if( $this->mFile !== null ) {
 669                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 670                         // Check if user is allowed to see this file
 671                         if ( !$file->exists() ) {
 672                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFile );
 673                                 return;
 674                         } else if( !$file->userCan( File::DELETED_FILE ) ) {
 675                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 676                                         $wgOut->permissionRequired( 'suppressrevision' );
 677                                 } else {
 678                                         $wgOut->permissionRequired( 'deletedtext' );
 679                                 }
 680                                 return false;
 681                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFile ) ) {
 682                                 $this->showFileConfirmationForm( $this->mFile );
 683                                 return false;
 684                         } else {
 685                                 return $this->showFile( $this->mFile );
 686                         }
 687                 }
 688                 if( $this->mRestore && $this->mAction == "submit" ) {
 689                         global $wgUploadMaintenance;
 690                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 691                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 692                                 return;
 693                         }
 694                         return $this->undelete();
 695                 }
 696                 if( $this->mInvert && $this->mAction == "submit" ) {
 697                         return $this->showHistory( );
 698                 }
 699                 return $this->showHistory();
 700         }
 701
 702         function showSearchForm() {
 703                 global $wgOut, $wgScript;
 704                 $wgOut->addWikiMsg( 'undelete-header' );
 705
 706                 $wgOut->addHTML(
 707                         Xml::openElement( 'form', array(
 708                                 'method' => 'get',
 709                                 'action' => $wgScript ) ) .
 710                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 711                         Xml::hidden( 'title',
 712                                 $this->getTitle()->getPrefixedDbKey() ) .
 713                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 714                                 'prefix', 'prefix', 20,
 715                                 $this->mSearchPrefix ) . ' ' .
 716                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 717                         Xml::closeElement( 'fieldset' ) .
 718                         Xml::closeElement( 'form' )
 719                 );
 720         }
 721
 722         // Generic list of deleted pages
 723         private function showList( $result ) {
 724                 global $wgLang, $wgUser, $wgOut;
 725
 726                 if( $result->numRows() == 0 ) {
 727                         $wgOut->addWikiMsg( 'undelete-no-results' );
 728                         return;
 729                 }
 730
 731                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 732
 733                 $sk = $wgUser->getSkin();
 734                 $undelete = $this->getTitle();
 735                 $wgOut->addHTML( "<ul>\n" );
 736                 while( $row = $result->fetchObject() ) {
 737                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 738                         $link = $sk->linkKnown(
 739                                 $undelete,
 740                                 htmlspecialchars( $title->getPrefixedText() ),
 741                                 array(),
 742                                 array( 'target' => $title->getPrefixedText() )
 743                         );
 744                         $revs = wfMsgExt( 'undeleterevisions',
 745                                 array( 'parseinline' ),
 746                                 $wgLang->formatNum( $row->count ) );
 747                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 748                 }
 749                 $result->free();
 750                 $wgOut->addHTML( "</ul>\n" );
 751
 752                 return true;
 753         }
 754
 755         private function showRevision( $timestamp ) {
 756                 global $wgLang, $wgUser, $wgOut;
 757
 758                 $skin = $wgUser->getSkin();
 759
 760                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 761
 762                 $archive = new PageArchive( $this->mTargetObj );
 763                 $rev = $archive->getRevision( $timestamp );
 764
 765                 if( !$rev ) {
 766                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 767                         return;
 768                 }
 769
 770                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 771                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 772                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 773                                 return;
 774                         } else {
 775                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 776                                 $wgOut->addHTML( '<br />' );
 777                                 // and we are allowed to see...
 778                         }
 779                 }
 780
 781                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 782
 783                 $link = $skin->linkKnown(
 784                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 785                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 786                 );
 787
 788                 if( $this->mDiff ) {
 789                         $previousRev = $archive->getPreviousRevision( $timestamp );
 790                         if( $previousRev ) {
 791                                 $this->showDiff( $previousRev, $rev );
 792                                 if( $wgUser->getOption( 'diffonly' ) ) {
 793                                         return;
 794                                 } else {
 795                                         $wgOut->addHTML( '<hr />' );
 796                                 }
 797                         } else {
 798                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 799                         }
 800                 }
 801
 802                 // date and time are separate parameters to facilitate localisation.
 803                 // $time is kept for backward compat reasons.
 804                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 805                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 806                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 807                 $user = $skin->revUserTools( $rev );
 808
 809                 if( $this->mPreview ) {
 810                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 811                 } else {
 812                         $openDiv = '<div id="mw-undelete-revision">';
 813                 }
 814
 815                 // Revision delete links
 816                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 817                 if( $this->mDiff ) {
 818                         $revdlink = ''; // diffs already have revision delete links
 819                 } else if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
 820                         if( !$rev->userCan(Revision::DELETED_RESTRICTED ) ) {
 821                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 822                         } else {
 823                                 $query = array(
 824                                         'type'   => 'archive',
 825                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
 826                                         'ids'    => $rev->getTimestamp()
 827                                 );
 828                                 $revdlink = $skin->revDeleteLink( $query,
 829                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 830                         }
 831                 } else {
 832                         $revdlink = '';
 833                 }
 834
 835                 $wgOut->addHTML( $openDiv . $revdlink . wfMsgWikiHtml( 'undelete-revision', $link, $time, $user, $d, $t ) . '</div>' );
 836                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 837
 838                 if( $this->mPreview ) {
 839                         //Hide [edit]s
 840                         $popts = $wgOut->parserOptions();
 841                         $popts->setEditSection( false );
 842                         $wgOut->parserOptions( $popts );
 843                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 844                 }
 845
 846                 $wgOut->addHTML(
 847                         Xml::element( 'textarea', array(
 848                                         'readonly' => 'readonly',
 849                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 850                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 851                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 852                         Xml::openElement( 'div' ) .
 853                         Xml::openElement( 'form', array(
 854                                 'method' => 'post',
 855                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 856                         Xml::element( 'input', array(
 857                                 'type' => 'hidden',
 858                                 'name' => 'target',
 859                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 860                         Xml::element( 'input', array(
 861                                 'type' => 'hidden',
 862                                 'name' => 'timestamp',
 863                                 'value' => $timestamp ) ) .
 864                         Xml::element( 'input', array(
 865                                 'type' => 'hidden',
 866                                 'name' => 'wpEditToken',
 867                                 'value' => $wgUser->editToken() ) ) .
 868                         Xml::element( 'input', array(
 869                                 'type' => 'submit',
 870                                 'name' => 'preview',
 871                                 'value' => wfMsg( 'showpreview' ) ) ) .
 872                         Xml::element( 'input', array(
 873                                 'name' => 'diff',
 874                                 'type' => 'submit',
 875                                 'value' => wfMsg( 'showdiff' ) ) ) .
 876                         Xml::closeElement( 'form' ) .
 877                         Xml::closeElement( 'div' ) );
 878         }
 879
 880         /**
 881          * Build a diff display between this and the previous either deleted
 882          * or non-deleted edit.
 883          *
 884          * @param $previousRev Revision
 885          * @param $currentRev Revision
 886          * @return String: HTML
 887          */
 888         function showDiff( $previousRev, $currentRev ) {
 889                 global $wgOut;
 890
 891                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 892                 $diffEngine->showDiffStyle();
 893                 $wgOut->addHTML(
 894                         "<div>" .
 895                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 896                         "<col class='diff-marker' />" .
 897                         "<col class='diff-content' />" .
 898                         "<col class='diff-marker' />" .
 899                         "<col class='diff-content' />" .
 900                         "<tr>" .
 901                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 902                                 $this->diffHeader( $previousRev, 'o' ) .
 903                                 "</td>\n" .
 904                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 905                                 $this->diffHeader( $currentRev, 'n' ) .
 906                                 "</td>\n" .
 907                         "</tr>" .
 908                         $diffEngine->generateDiffBody(
 909                                 $previousRev->getText(), $currentRev->getText() ) .
 910                         "</table>" .
 911                         "</div>\n"
 912                 );
 913         }
 914
 915         private function diffHeader( $rev, $prefix ) {
 916                 global $wgUser, $wgLang;
 917                 $sk = $wgUser->getSkin();
 918                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 919                 if( $isDeleted ) {
 920                         /// @todo Fixme: $rev->getTitle() is null for deleted revs...?
 921                         $targetPage = $this->getTitle();
 922                         $targetQuery = array(
 923                                 'target' => $this->mTargetObj->getPrefixedText(),
 924                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 925                         );
 926                 } else {
 927                         /// @todo Fixme getId() may return non-zero for deleted revs...
 928                         $targetPage = $rev->getTitle();
 929                         $targetQuery = array( 'oldid' => $rev->getId() );
 930                 }
 931                 // Add show/hide deletion links if available
 932                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 933                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
 934                         $del = ' ';
 935                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 936                                 $del .= $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 937                         } else {
 938                                 $query = array(
 939                                         'type'   => 'archive',
 940                                         'target' => $this->mTargetObj->getPrefixedDbkey(),
 941                                         'ids'    => $rev->getTimestamp()
 942                                 );
 943                                 $del .= $sk->revDeleteLink( $query,
 944                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
 945                         }
 946                 } else {
 947                         $del = '';
 948                 }
 949                 return
 950                         '<div id="mw-diff-'.$prefix.'title1"><strong>' .
 951                                 $sk->link(
 952                                         $targetPage,
 953                                         wfMsgHtml(
 954                                                 'revisionasof',
 955                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 956                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
 957                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
 958                                         ),
 959                                         array(),
 960                                         $targetQuery
 961                                 ) .
 962                         '</strong></div>' .
 963                         '<div id="mw-diff-'.$prefix.'title2">' .
 964                                 $sk->revUserTools( $rev ) . '<br />' .
 965                         '</div>' .
 966                         '<div id="mw-diff-'.$prefix.'title3">' .
 967                                 $sk->revComment( $rev ) . $del . '<br />' .
 968                         '</div>';
 969         }
 970
 971         /**
 972          * Show a form confirming whether a tokenless user really wants to see a file
 973          */
 974         private function showFileConfirmationForm( $key ) {
 975                 global $wgOut, $wgUser, $wgLang;
 976                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 977                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
 978                         $this->mTargetObj->getText(),
 979                         $wgLang->date( $file->getTimestamp() ),
 980                         $wgLang->time( $file->getTimestamp() ) );
 981                 $wgOut->addHTML(
 982                         Xml::openElement( 'form', array(
 983                                 'method' => 'POST',
 984                                 'action' => $this->getTitle()->getLocalUrl(
 985                                         'target=' . urlencode( $this->mTarget ) .
 986                                         '&file=' . urlencode( $key ) .
 987                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
 988                                 )
 989                         ) .
 990                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
 991                         '</form>'
 992                 );
 993         }
 994
 995         /**
 996          * Show a deleted file version requested by the visitor.
 997          */
 998         private function showFile( $key ) {
 999                 global $wgOut, $wgRequest;
1000                 $wgOut->disable();
1001
1002                 # We mustn't allow the output to be Squid cached, otherwise
1003                 # if an admin previews a deleted image, and it's cached, then
1004                 # a user without appropriate permissions can toddle off and
1005                 # nab the image, and Squid will serve it
1006                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1007                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1008                 $wgRequest->response()->header( 'Pragma: no-cache' );
1009
1010                 global $IP;
1011                 require_once( "$IP/includes/StreamFile.php" );
1012                 $repo = RepoGroup::singleton()->getLocalRepo();
1013                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1014                 wfStreamFile( $path );
1015         }
1016
1017         private function showHistory( ) {
1018                 global $wgUser, $wgOut;
1019
1020                 $sk = $wgUser->getSkin();
1021                 if( $this->mAllowed ) {
1022                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
1023                 } else {
1024                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
1025                 }
1026
1027                 $wgOut->wrapWikiMsg(  "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n", array ( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() ) );
1028
1029                 $archive = new PageArchive( $this->mTargetObj );
1030                 /*
1031                 $text = $archive->getLastRevisionText();
1032                 if( is_null( $text ) ) {
1033                         $wgOut->addWikiMsg( "nohistory" );
1034                         return;
1035                 }
1036                 */
1037                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1038                 if ( $this->mAllowed ) {
1039                         $wgOut->addWikiMsg( "undeletehistory" );
1040                         $wgOut->addWikiMsg( "undeleterevdel" );
1041                 } else {
1042                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
1043                 }
1044                 $wgOut->addHTML( '</div>' );
1045
1046                 # List all stored revisions
1047                 $revisions = $archive->listRevisions();
1048                 $files = $archive->listFiles();
1049
1050                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1051                 $haveFiles = $files && $files->numRows() > 0;
1052
1053                 # Batch existence check on user and talk pages
1054                 if( $haveRevisions ) {
1055                         $batch = new LinkBatch();
1056                         while( $row = $revisions->fetchObject() ) {
1057                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1058                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1059                         }
1060                         $batch->execute();
1061                         $revisions->seek( 0 );
1062                 }
1063                 if( $haveFiles ) {
1064                         $batch = new LinkBatch();
1065                         while( $row = $files->fetchObject() ) {
1066                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1067                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1068                         }
1069                         $batch->execute();
1070                         $files->seek( 0 );
1071                 }
1072
1073                 if ( $this->mAllowed ) {
1074                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1075                         # Start the form here
1076                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1077                         $wgOut->addHTML( $top );
1078                 }
1079
1080                 # Show relevant lines from the deletion log:
1081                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1082                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1083                 # Show relevant lines from the suppression log:
1084                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1085                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1086                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1087                 }
1088
1089                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1090                         # Format the user-visible controls (comment field, submission button)
1091                         # in a nice little table
1092                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1093                                 $unsuppressBox =
1094                                         "<tr>
1095                                                 <td>&#160;</td>
1096                                                 <td class='mw-input'>" .
1097                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
1098                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1099                                                 "</td>
1100                                         </tr>";
1101                         } else {
1102                                 $unsuppressBox = "";
1103                         }
1104                         $table =
1105                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1106                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1107                                         "<tr>
1108                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1109                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
1110                                                 "</td>
1111                                         </tr>
1112                                         <tr>
1113                                                 <td class='mw-label'>" .
1114                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1115                                                 "</td>
1116                                                 <td class='mw-input'>" .
1117                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1118                                                 "</td>
1119                                         </tr>
1120                                         <tr>
1121                                                 <td>&#160;</td>
1122                                                 <td class='mw-submit'>" .
1123                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1124                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) . ' ' .
1125                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1126                                                 "</td>
1127                                         </tr>" .
1128                                         $unsuppressBox .
1129                                 Xml::closeElement( 'table' ) .
1130                                 Xml::closeElement( 'fieldset' );
1131
1132                         $wgOut->addHTML( $table );
1133                 }
1134
1135                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1136
1137                 if( $haveRevisions ) {
1138                         # The page's stored (deleted) history:
1139                         $wgOut->addHTML("<ul>");
1140                         $target = urlencode( $this->mTarget );
1141                         $remaining = $revisions->numRows();
1142                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1143
1144                         while( $row = $revisions->fetchObject() ) {
1145                                 $remaining--;
1146                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1147                         }
1148                         $revisions->free();
1149                         $wgOut->addHTML("</ul>");
1150                 } else {
1151                         $wgOut->addWikiMsg( "nohistory" );
1152                 }
1153
1154                 if( $haveFiles ) {
1155                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1156                         $wgOut->addHTML( "<ul>" );
1157                         while( $row = $files->fetchObject() ) {
1158                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1159                         }
1160                         $files->free();
1161                         $wgOut->addHTML( "</ul>" );
1162                 }
1163
1164                 if ( $this->mAllowed ) {
1165                         # Slip in the hidden controls here
1166                         $misc  = Xml::hidden( 'target', $this->mTarget );
1167                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
1168                         $misc .= Xml::closeElement( 'form' );
1169                         $wgOut->addHTML( $misc );
1170                 }
1171
1172                 return true;
1173         }
1174
1175         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1176                 global $wgUser, $wgLang;
1177
1178                 $rev = Revision::newFromArchiveRow( $row,
1179                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1180                 $stxt = '';
1181                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1182                 // Build checkboxen...
1183                 if( $this->mAllowed ) {
1184                         if( $this->mInvert ) {
1185                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1186                                         $checkBox = Xml::check( "ts$ts");
1187                                 } else {
1188                                         $checkBox = Xml::check( "ts$ts", true );
1189                                 }
1190                         } else {
1191                                 $checkBox = Xml::check( "ts$ts" );
1192                         }
1193                 } else {
1194                         $checkBox = '';
1195                 }
1196                 // Build page & diff links...
1197                 if( $this->mCanView ) {
1198                         $titleObj = $this->getTitle();
1199                         # Last link
1200                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1201                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1202                                 $last = wfMsgHtml('diff');
1203                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1204                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1205                                 $last = $sk->linkKnown(
1206                                         $titleObj,
1207                                         wfMsgHtml('diff'),
1208                                         array(),
1209                                         array(
1210                                                 'target' => $this->mTargetObj->getPrefixedText(),
1211                                                 'timestamp' => $ts,
1212                                                 'diff' => 'prev'
1213                                         )
1214                                 );
1215                         } else {
1216                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1217                                 $last = wfMsgHtml('diff');
1218                         }
1219                 } else {
1220                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1221                         $last = wfMsgHtml('diff');
1222                 }
1223                 // User links
1224                 $userLink = $sk->revUserTools( $rev );
1225                 // Revision text size
1226                 if( !is_null($size = $row->ar_len) ) {
1227                         $stxt = $sk->formatRevisionSize( $size );
1228                 }
1229                 // Edit summary
1230                 $comment = $sk->revComment( $rev );
1231                 // Revision delete links
1232                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1233                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1234                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1235                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1236                         } else {
1237                                 $query = array(
1238                                         'type'   => 'archive',
1239                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1240                                         'ids'    => $ts
1241                                 );
1242                                 $revdlink = $sk->revDeleteLink( $query,
1243                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
1244                         }
1245                 } else {
1246                         $revdlink = '';
1247                 }
1248                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1249         }
1250
1251         private function formatFileRow( $row, $sk ) {
1252                 global $wgUser, $wgLang;
1253
1254                 $file = ArchivedFile::newFromRow( $row );
1255
1256                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1257                 if( $this->mAllowed && $row->fa_storage_key ) {
1258                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1259                         $key = urlencode( $row->fa_storage_key );
1260                         $target = urlencode( $this->mTarget );
1261                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1262                 } else {
1263                         $checkBox = '';
1264                         $pageLink = $wgLang->timeanddate( $ts, true );
1265                 }
1266                 $userLink = $this->getFileUser( $file, $sk );
1267                 $data =
1268                         wfMsg( 'widthheight',
1269                                 $wgLang->formatNum( $row->fa_width ),
1270                                 $wgLang->formatNum( $row->fa_height ) ) .
1271                         ' (' .
1272                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1273                         ')';
1274                 $data = htmlspecialchars( $data );
1275                 $comment = $this->getFileComment( $file, $sk );
1276                 // Add show/hide deletion links if available
1277                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1278                 if( $canHide || ($file->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1279                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1280                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1281                         } else {
1282                                 $query = array(
1283                                         'type' => 'filearchive',
1284                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1285                                         'ids' => $row->fa_id
1286                                 );
1287                                 $revdlink = $sk->revDeleteLink( $query,
1288                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1289                         }
1290                 } else {
1291                         $revdlink = '';
1292                 }
1293                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1294         }
1295
1296         /**
1297          * Fetch revision text link if it's available to all users
1298          * @return string
1299          */
1300         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1301                 global $wgLang;
1302
1303                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1304
1305                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1306                         return '<span class="history-deleted">' . $time . '</span>';
1307                 } else {
1308                         $link = $sk->linkKnown(
1309                                 $titleObj,
1310                                 $time,
1311                                 array(),
1312                                 array(
1313                                         'target' => $this->mTargetObj->getPrefixedText(),
1314                                         'timestamp' => $ts
1315                                 )
1316                         );
1317                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1318                                 $link = '<span class="history-deleted">' . $link . '</span>';
1319                         return $link;
1320                 }
1321         }
1322
1323         /**
1324          * Fetch image view link if it's available to all users
1325          *
1326          * @return String: HTML fragment
1327          */
1328         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1329                 global $wgLang, $wgUser;
1330
1331                 if( !$file->userCan(File::DELETED_FILE) ) {
1332                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1333                 } else {
1334                         $link = $sk->linkKnown(
1335                                 $titleObj,
1336                                 $wgLang->timeanddate( $ts, true ),
1337                                 array(),
1338                                 array(
1339                                         'target' => $this->mTargetObj->getPrefixedText(),
1340                                         'file' => $key,
1341                                         'token' => $wgUser->editToken( $key )
1342                                 )
1343                         );
1344                         if( $file->isDeleted(File::DELETED_FILE) )
1345                                 $link = '<span class="history-deleted">' . $link . '</span>';
1346                         return $link;
1347                 }
1348         }
1349
1350         /**
1351          * Fetch file's user id if it's available to this user
1352          *
1353          * @return String: HTML fragment
1354          */
1355         function getFileUser( $file, $sk ) {
1356                 if( !$file->userCan(File::DELETED_USER) ) {
1357                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1358                 } else {
1359                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1360                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1361                         if( $file->isDeleted(File::DELETED_USER) )
1362                                 $link = '<span class="history-deleted">' . $link . '</span>';
1363                         return $link;
1364                 }
1365         }
1366
1367         /**
1368          * Fetch file upload comment if it's available to this user
1369          *
1370          * @return String: HTML fragment
1371          */
1372         function getFileComment( $file, $sk ) {
1373                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1374                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1375                 } else {
1376                         $link = $sk->commentBlock( $file->getRawDescription() );
1377                         if( $file->isDeleted(File::DELETED_COMMENT) )
1378                                 $link = '<span class="history-deleted">' . $link . '</span>';
1379                         return $link;
1380                 }
1381         }
1382
1383         function undelete() {
1384                 global $wgOut, $wgUser;
1385                 if ( wfReadOnly() ) {
1386                         $wgOut->readOnlyPage();
1387                         return;
1388                 }
1389                 if( !is_null( $this->mTargetObj ) ) {
1390                         $archive = new PageArchive( $this->mTargetObj );
1391                         $ok = $archive->undelete(
1392                                 $this->mTargetTimestamp,
1393                                 $this->mComment,
1394                                 $this->mFileVersions,
1395                                 $this->mUnsuppress );
1396
1397                         if( is_array($ok) ) {
1398                                 if ( $ok[1] ) // Undeleted file count
1399                                         wfRunHooks( 'FileUndeleteComplete', array(
1400                                                 $this->mTargetObj, $this->mFileVersions,
1401                                                 $wgUser, $this->mComment) );
1402
1403                                 $skin = $wgUser->getSkin();
1404                                 $link = $skin->linkKnown( $this->mTargetObj );
1405                                 $wgOut->addHTML( wfMsgWikiHtml( 'undeletedpage', $link ) );
1406                         } else {
1407                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1408                                 $wgOut->addHTML( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1409                         }
1410
1411                         // Show file deletion warnings and errors
1412                         $status = $archive->getFileStatus();
1413                         if( $status && !$status->isGood() ) {
1414                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1415                         }
1416                 } else {
1417                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1418                 }
1419                 return false;
1420         }
1421 }