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                         wfDebug( "Undelete: unknown error...\n" );
 544                         return false;
 545                 }
 546
 547                 return $restored;
 548         }
 549
 550         function getFileStatus() { return $this->fileStatus; }
 551 }
 552
 553 /**
 554  * Special page allowing users with the appropriate permissions to view
 555  * and restore deleted content.
 556  *
 557  * @ingroup SpecialPage
 558  */
 559 class UndeleteForm extends SpecialPage {
 560         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj;
 561         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 562
 563         function __construct( $request = null ) {
 564                 parent::__construct( 'Undelete', 'deletedhistory' );
 565
 566                 if ( $request === null ) {
 567                         global $wgRequest;
 568                         $this->mRequest = $wgRequest;
 569                 } else {
 570                         $this->mRequest = $request;
 571                 }
 572         }
 573
 574         function loadRequest() {
 575                 global $wgUser;
 576                 $this->mAction = $this->mRequest->getVal( 'action' );
 577                 $this->mTarget = $this->mRequest->getVal( 'target' );
 578                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 579                 $time = $this->mRequest->getVal( 'timestamp' );
 580                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 581                 $this->mFile = $this->mRequest->getVal( 'file' );
 582
 583                 $posted = $this->mRequest->wasPosted() &&
 584                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 585                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 586                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 587                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 588                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 589                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 590                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 591                 $this->mToken = $this->mRequest->getVal( 'token' );
 592
 593                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 594                         $this->mAllowed = true; // user can restore
 595                         $this->mCanView = true; // user can view content
 596                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 597                         $this->mAllowed = false; // user cannot restore
 598                         $this->mCanView = true; // user can view content
 599                 }  else { // user can only view the list of revisions
 600                         $this->mAllowed = false;
 601                         $this->mCanView = false;
 602                         $this->mTimestamp = '';
 603                         $this->mRestore = false;
 604                 }
 605
 606                 if( $this->mRestore || $this->mInvert ) {
 607                         $timestamps = array();
 608                         $this->mFileVersions = array();
 609                         foreach( $_REQUEST as $key => $val ) {
 610                                 $matches = array();
 611                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 612                                         array_push( $timestamps, $matches[1] );
 613                                 }
 614
 615                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 616                                         $this->mFileVersions[] = intval( $matches[1] );
 617                                 }
 618                         }
 619                         rsort( $timestamps );
 620                         $this->mTargetTimestamp = $timestamps;
 621                 }
 622         }
 623
 624         function execute( $par ) {
 625                 global $wgOut, $wgUser;
 626
 627                 $this->setHeaders();
 628                 if ( !$this->userCanExecute( $wgUser ) ) {
 629                         $this->displayRestrictionError();
 630                         return;
 631                 }
 632                 $this->outputHeader();
 633
 634                 $this->loadRequest();
 635
 636                 if ( $this->mAllowed ) {
 637                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 638                 } else {
 639                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 640                 }
 641
 642                 if( $par != '' ) {
 643                         $this->mTarget = $par;
 644                 }
 645                 if ( $this->mTarget !== '' ) {
 646                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 647                 } else {
 648                         $this->mTargetObj = null;
 649                 }
 650
 651                 if( is_null( $this->mTargetObj ) ) {
 652                 # Not all users can just browse every deleted page from the list
 653                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 654                                 $this->showSearchForm();
 655
 656                                 # List undeletable articles
 657                                 if( $this->mSearchPrefix ) {
 658                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 659                                         $this->showList( $result );
 660                                 }
 661                         } else {
 662                                 $wgOut->addWikiMsg( 'undelete-header' );
 663                         }
 664                         return;
 665                 }
 666                 if( $this->mTimestamp !== '' ) {
 667                         return $this->showRevision( $this->mTimestamp );
 668                 }
 669                 if( $this->mFile !== null ) {
 670                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 671                         // Check if user is allowed to see this file
 672                         if ( !$file->exists() ) {
 673                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFile );
 674                                 return;
 675                         } else if( !$file->userCan( File::DELETED_FILE ) ) {
 676                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 677                                         $wgOut->permissionRequired( 'suppressrevision' );
 678                                 } else {
 679                                         $wgOut->permissionRequired( 'deletedtext' );
 680                                 }
 681                                 return false;
 682                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFile ) ) {
 683                                 $this->showFileConfirmationForm( $this->mFile );
 684                                 return false;
 685                         } else {
 686                                 return $this->showFile( $this->mFile );
 687                         }
 688                 }
 689                 if( $this->mRestore && $this->mAction == "submit" ) {
 690                         global $wgUploadMaintenance;
 691                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 692                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 693                                 return;
 694                         }
 695                         return $this->undelete();
 696                 }
 697                 if( $this->mInvert && $this->mAction == "submit" ) {
 698                         return $this->showHistory( );
 699                 }
 700                 return $this->showHistory();
 701         }
 702
 703         function showSearchForm() {
 704                 global $wgOut, $wgScript;
 705                 $wgOut->addWikiMsg( 'undelete-header' );
 706
 707                 $wgOut->addHTML(
 708                         Xml::openElement( 'form', array(
 709                                 'method' => 'get',
 710                                 'action' => $wgScript ) ) .
 711                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 712                         Xml::hidden( 'title',
 713                                 $this->getTitle()->getPrefixedDbKey() ) .
 714                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 715                                 'prefix', 'prefix', 20,
 716                                 $this->mSearchPrefix ) . ' ' .
 717                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 718                         Xml::closeElement( 'fieldset' ) .
 719                         Xml::closeElement( 'form' )
 720                 );
 721         }
 722
 723         // Generic list of deleted pages
 724         private function showList( $result ) {
 725                 global $wgLang, $wgUser, $wgOut;
 726
 727                 if( $result->numRows() == 0 ) {
 728                         $wgOut->addWikiMsg( 'undelete-no-results' );
 729                         return;
 730                 }
 731
 732                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 733
 734                 $sk = $wgUser->getSkin();
 735                 $undelete = $this->getTitle();
 736                 $wgOut->addHTML( "<ul>\n" );
 737                 while( $row = $result->fetchObject() ) {
 738                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 739                         $link = $sk->linkKnown(
 740                                 $undelete,
 741                                 htmlspecialchars( $title->getPrefixedText() ),
 742                                 array(),
 743                                 array( 'target' => $title->getPrefixedText() )
 744                         );
 745                         $revs = wfMsgExt( 'undeleterevisions',
 746                                 array( 'parseinline' ),
 747                                 $wgLang->formatNum( $row->count ) );
 748                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 749                 }
 750                 $result->free();
 751                 $wgOut->addHTML( "</ul>\n" );
 752
 753                 return true;
 754         }
 755
 756         private function showRevision( $timestamp ) {
 757                 global $wgLang, $wgUser, $wgOut;
 758
 759                 $skin = $wgUser->getSkin();
 760
 761                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 762
 763                 $archive = new PageArchive( $this->mTargetObj );
 764                 $rev = $archive->getRevision( $timestamp );
 765
 766                 if( !$rev ) {
 767                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 768                         return;
 769                 }
 770
 771                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 772                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 773                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 774                                 return;
 775                         } else {
 776                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 777                                 $wgOut->addHTML( '<br />' );
 778                                 // and we are allowed to see...
 779                         }
 780                 }
 781
 782                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 783
 784                 $link = $skin->linkKnown(
 785                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 786                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 787                 );
 788
 789                 if( $this->mDiff ) {
 790                         $previousRev = $archive->getPreviousRevision( $timestamp );
 791                         if( $previousRev ) {
 792                                 $this->showDiff( $previousRev, $rev );
 793                                 if( $wgUser->getOption( 'diffonly' ) ) {
 794                                         return;
 795                                 } else {
 796                                         $wgOut->addHTML( '<hr />' );
 797                                 }
 798                         } else {
 799                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 800                         }
 801                 }
 802
 803                 // date and time are separate parameters to facilitate localisation.
 804                 // $time is kept for backward compat reasons.
 805                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 806                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 807                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 808                 $user = $skin->revUserTools( $rev );
 809
 810                 if( $this->mPreview ) {
 811                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 812                 } else {
 813                         $openDiv = '<div id="mw-undelete-revision">';
 814                 }
 815
 816                 // Revision delete links
 817                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 818                 if( $this->mDiff ) {
 819                         $revdlink = ''; // diffs already have revision delete links
 820                 } else if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
 821                         if( !$rev->userCan(Revision::DELETED_RESTRICTED ) ) {
 822                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 823                         } else {
 824                                 $query = array(
 825                                         'type'   => 'archive',
 826                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
 827                                         'ids'    => $rev->getTimestamp()
 828                                 );
 829                                 $revdlink = $skin->revDeleteLink( $query,
 830                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 831                         }
 832                 } else {
 833                         $revdlink = '';
 834                 }
 835
 836                 $wgOut->addHTML( $openDiv . $revdlink . wfMsgWikiHtml( 'undelete-revision', $link, $time, $user, $d, $t ) . '</div>' );
 837                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 838
 839                 if( $this->mPreview ) {
 840                         //Hide [edit]s
 841                         $popts = $wgOut->parserOptions();
 842                         $popts->setEditSection( false );
 843                         $wgOut->parserOptions( $popts );
 844                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 845                 }
 846
 847                 $wgOut->addHTML(
 848                         Xml::element( 'textarea', array(
 849                                         'readonly' => 'readonly',
 850                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 851                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 852                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 853                         Xml::openElement( 'div' ) .
 854                         Xml::openElement( 'form', array(
 855                                 'method' => 'post',
 856                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 857                         Xml::element( 'input', array(
 858                                 'type' => 'hidden',
 859                                 'name' => 'target',
 860                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 861                         Xml::element( 'input', array(
 862                                 'type' => 'hidden',
 863                                 'name' => 'timestamp',
 864                                 'value' => $timestamp ) ) .
 865                         Xml::element( 'input', array(
 866                                 'type' => 'hidden',
 867                                 'name' => 'wpEditToken',
 868                                 'value' => $wgUser->editToken() ) ) .
 869                         Xml::element( 'input', array(
 870                                 'type' => 'submit',
 871                                 'name' => 'preview',
 872                                 'value' => wfMsg( 'showpreview' ) ) ) .
 873                         Xml::element( 'input', array(
 874                                 'name' => 'diff',
 875                                 'type' => 'submit',
 876                                 'value' => wfMsg( 'showdiff' ) ) ) .
 877                         Xml::closeElement( 'form' ) .
 878                         Xml::closeElement( 'div' ) );
 879         }
 880
 881         /**
 882          * Build a diff display between this and the previous either deleted
 883          * or non-deleted edit.
 884          *
 885          * @param $previousRev Revision
 886          * @param $currentRev Revision
 887          * @return String: HTML
 888          */
 889         function showDiff( $previousRev, $currentRev ) {
 890                 global $wgOut;
 891
 892                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 893                 $diffEngine->showDiffStyle();
 894                 $wgOut->addHTML(
 895                         "<div>" .
 896                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 897                         "<col class='diff-marker' />" .
 898                         "<col class='diff-content' />" .
 899                         "<col class='diff-marker' />" .
 900                         "<col class='diff-content' />" .
 901                         "<tr>" .
 902                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 903                                 $this->diffHeader( $previousRev, 'o' ) .
 904                                 "</td>\n" .
 905                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 906                                 $this->diffHeader( $currentRev, 'n' ) .
 907                                 "</td>\n" .
 908                         "</tr>" .
 909                         $diffEngine->generateDiffBody(
 910                                 $previousRev->getText(), $currentRev->getText() ) .
 911                         "</table>" .
 912                         "</div>\n"
 913                 );
 914         }
 915
 916         private function diffHeader( $rev, $prefix ) {
 917                 global $wgUser, $wgLang;
 918                 $sk = $wgUser->getSkin();
 919                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 920                 if( $isDeleted ) {
 921                         /// @todo Fixme: $rev->getTitle() is null for deleted revs...?
 922                         $targetPage = $this->getTitle();
 923                         $targetQuery = array(
 924                                 'target' => $this->mTargetObj->getPrefixedText(),
 925                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 926                         );
 927                 } else {
 928                         /// @todo Fixme getId() may return non-zero for deleted revs...
 929                         $targetPage = $rev->getTitle();
 930                         $targetQuery = array( 'oldid' => $rev->getId() );
 931                 }
 932                 // Add show/hide deletion links if available
 933                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 934                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
 935                         $del = ' ';
 936                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 937                                 $del .= $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 938                         } else {
 939                                 $query = array(
 940                                         'type'   => 'archive',
 941                                         'target' => $this->mTargetObj->getPrefixedDbkey(),
 942                                         'ids'    => $rev->getTimestamp()
 943                                 );
 944                                 $del .= $sk->revDeleteLink( $query,
 945                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
 946                         }
 947                 } else {
 948                         $del = '';
 949                 }
 950                 return
 951                         '<div id="mw-diff-'.$prefix.'title1"><strong>' .
 952                                 $sk->link(
 953                                         $targetPage,
 954                                         wfMsgHtml(
 955                                                 'revisionasof',
 956                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 957                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
 958                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
 959                                         ),
 960                                         array(),
 961                                         $targetQuery
 962                                 ) .
 963                         '</strong></div>' .
 964                         '<div id="mw-diff-'.$prefix.'title2">' .
 965                                 $sk->revUserTools( $rev ) . '<br />' .
 966                         '</div>' .
 967                         '<div id="mw-diff-'.$prefix.'title3">' .
 968                                 $sk->revComment( $rev ) . $del . '<br />' .
 969                         '</div>';
 970         }
 971
 972         /**
 973          * Show a form confirming whether a tokenless user really wants to see a file
 974          */
 975         private function showFileConfirmationForm( $key ) {
 976                 global $wgOut, $wgUser, $wgLang;
 977                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 978                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
 979                         $this->mTargetObj->getText(),
 980                         $wgLang->date( $file->getTimestamp() ),
 981                         $wgLang->time( $file->getTimestamp() ) );
 982                 $wgOut->addHTML(
 983                         Xml::openElement( 'form', array(
 984                                 'method' => 'POST',
 985                                 'action' => $this->getTitle()->getLocalUrl(
 986                                         'target=' . urlencode( $this->mTarget ) .
 987                                         '&file=' . urlencode( $key ) .
 988                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
 989                                 )
 990                         ) .
 991                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
 992                         '</form>'
 993                 );
 994         }
 995
 996         /**
 997          * Show a deleted file version requested by the visitor.
 998          */
 999         private function showFile( $key ) {
1000                 global $wgOut, $wgRequest;
1001                 $wgOut->disable();
1002
1003                 # We mustn't allow the output to be Squid cached, otherwise
1004                 # if an admin previews a deleted image, and it's cached, then
1005                 # a user without appropriate permissions can toddle off and
1006                 # nab the image, and Squid will serve it
1007                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1008                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1009                 $wgRequest->response()->header( 'Pragma: no-cache' );
1010
1011                 global $IP;
1012                 require_once( "$IP/includes/StreamFile.php" );
1013                 $repo = RepoGroup::singleton()->getLocalRepo();
1014                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1015                 wfStreamFile( $path );
1016         }
1017
1018         private function showHistory( ) {
1019                 global $wgUser, $wgOut;
1020
1021                 $sk = $wgUser->getSkin();
1022                 if( $this->mAllowed ) {
1023                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
1024                 } else {
1025                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
1026                 }
1027
1028                 $wgOut->wrapWikiMsg(  "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n", array ( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() ) );
1029
1030                 $archive = new PageArchive( $this->mTargetObj );
1031                 /*
1032                 $text = $archive->getLastRevisionText();
1033                 if( is_null( $text ) ) {
1034                         $wgOut->addWikiMsg( "nohistory" );
1035                         return;
1036                 }
1037                 */
1038                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1039                 if ( $this->mAllowed ) {
1040                         $wgOut->addWikiMsg( "undeletehistory" );
1041                         $wgOut->addWikiMsg( "undeleterevdel" );
1042                 } else {
1043                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
1044                 }
1045                 $wgOut->addHTML( '</div>' );
1046
1047                 # List all stored revisions
1048                 $revisions = $archive->listRevisions();
1049                 $files = $archive->listFiles();
1050
1051                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1052                 $haveFiles = $files && $files->numRows() > 0;
1053
1054                 # Batch existence check on user and talk pages
1055                 if( $haveRevisions ) {
1056                         $batch = new LinkBatch();
1057                         while( $row = $revisions->fetchObject() ) {
1058                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1059                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1060                         }
1061                         $batch->execute();
1062                         $revisions->seek( 0 );
1063                 }
1064                 if( $haveFiles ) {
1065                         $batch = new LinkBatch();
1066                         while( $row = $files->fetchObject() ) {
1067                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1068                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1069                         }
1070                         $batch->execute();
1071                         $files->seek( 0 );
1072                 }
1073
1074                 if ( $this->mAllowed ) {
1075                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1076                         # Start the form here
1077                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1078                         $wgOut->addHTML( $top );
1079                 }
1080
1081                 # Show relevant lines from the deletion log:
1082                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1083                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1084                 # Show relevant lines from the suppression log:
1085                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1086                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1087                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1088                 }
1089
1090                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1091                         # Format the user-visible controls (comment field, submission button)
1092                         # in a nice little table
1093                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1094                                 $unsuppressBox =
1095                                         "<tr>
1096                                                 <td>&#160;</td>
1097                                                 <td class='mw-input'>" .
1098                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
1099                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1100                                                 "</td>
1101                                         </tr>";
1102                         } else {
1103                                 $unsuppressBox = "";
1104                         }
1105                         $table =
1106                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1107                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1108                                         "<tr>
1109                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1110                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
1111                                                 "</td>
1112                                         </tr>
1113                                         <tr>
1114                                                 <td class='mw-label'>" .
1115                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1116                                                 "</td>
1117                                                 <td class='mw-input'>" .
1118                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1119                                                 "</td>
1120                                         </tr>
1121                                         <tr>
1122                                                 <td>&#160;</td>
1123                                                 <td class='mw-submit'>" .
1124                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1125                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) . ' ' .
1126                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1127                                                 "</td>
1128                                         </tr>" .
1129                                         $unsuppressBox .
1130                                 Xml::closeElement( 'table' ) .
1131                                 Xml::closeElement( 'fieldset' );
1132
1133                         $wgOut->addHTML( $table );
1134                 }
1135
1136                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1137
1138                 if( $haveRevisions ) {
1139                         # The page's stored (deleted) history:
1140                         $wgOut->addHTML("<ul>");
1141                         $target = urlencode( $this->mTarget );
1142                         $remaining = $revisions->numRows();
1143                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1144
1145                         while( $row = $revisions->fetchObject() ) {
1146                                 $remaining--;
1147                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1148                         }
1149                         $revisions->free();
1150                         $wgOut->addHTML("</ul>");
1151                 } else {
1152                         $wgOut->addWikiMsg( "nohistory" );
1153                 }
1154
1155                 if( $haveFiles ) {
1156                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1157                         $wgOut->addHTML( "<ul>" );
1158                         while( $row = $files->fetchObject() ) {
1159                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1160                         }
1161                         $files->free();
1162                         $wgOut->addHTML( "</ul>" );
1163                 }
1164
1165                 if ( $this->mAllowed ) {
1166                         # Slip in the hidden controls here
1167                         $misc  = Xml::hidden( 'target', $this->mTarget );
1168                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
1169                         $misc .= Xml::closeElement( 'form' );
1170                         $wgOut->addHTML( $misc );
1171                 }
1172
1173                 return true;
1174         }
1175
1176         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1177                 global $wgUser, $wgLang;
1178
1179                 $rev = Revision::newFromArchiveRow( $row,
1180                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1181                 $stxt = '';
1182                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1183                 // Build checkboxen...
1184                 if( $this->mAllowed ) {
1185                         if( $this->mInvert ) {
1186                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1187                                         $checkBox = Xml::check( "ts$ts");
1188                                 } else {
1189                                         $checkBox = Xml::check( "ts$ts", true );
1190                                 }
1191                         } else {
1192                                 $checkBox = Xml::check( "ts$ts" );
1193                         }
1194                 } else {
1195                         $checkBox = '';
1196                 }
1197                 // Build page & diff links...
1198                 if( $this->mCanView ) {
1199                         $titleObj = $this->getTitle();
1200                         # Last link
1201                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1202                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1203                                 $last = wfMsgHtml('diff');
1204                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1205                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1206                                 $last = $sk->linkKnown(
1207                                         $titleObj,
1208                                         wfMsgHtml('diff'),
1209                                         array(),
1210                                         array(
1211                                                 'target' => $this->mTargetObj->getPrefixedText(),
1212                                                 'timestamp' => $ts,
1213                                                 'diff' => 'prev'
1214                                         )
1215                                 );
1216                         } else {
1217                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1218                                 $last = wfMsgHtml('diff');
1219                         }
1220                 } else {
1221                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1222                         $last = wfMsgHtml('diff');
1223                 }
1224                 // User links
1225                 $userLink = $sk->revUserTools( $rev );
1226                 // Revision text size
1227                 if( !is_null($size = $row->ar_len) ) {
1228                         $stxt = $sk->formatRevisionSize( $size );
1229                 }
1230                 // Edit summary
1231                 $comment = $sk->revComment( $rev );
1232                 // Revision delete links
1233                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1234                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1235                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1236                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1237                         } else {
1238                                 $query = array(
1239                                         'type'   => 'archive',
1240                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1241                                         'ids'    => $ts
1242                                 );
1243                                 $revdlink = $sk->revDeleteLink( $query,
1244                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
1245                         }
1246                 } else {
1247                         $revdlink = '';
1248                 }
1249                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1250         }
1251
1252         private function formatFileRow( $row, $sk ) {
1253                 global $wgUser, $wgLang;
1254
1255                 $file = ArchivedFile::newFromRow( $row );
1256
1257                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1258                 if( $this->mAllowed && $row->fa_storage_key ) {
1259                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1260                         $key = urlencode( $row->fa_storage_key );
1261                         $target = urlencode( $this->mTarget );
1262                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1263                 } else {
1264                         $checkBox = '';
1265                         $pageLink = $wgLang->timeanddate( $ts, true );
1266                 }
1267                 $userLink = $this->getFileUser( $file, $sk );
1268                 $data =
1269                         wfMsg( 'widthheight',
1270                                 $wgLang->formatNum( $row->fa_width ),
1271                                 $wgLang->formatNum( $row->fa_height ) ) .
1272                         ' (' .
1273                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1274                         ')';
1275                 $data = htmlspecialchars( $data );
1276                 $comment = $this->getFileComment( $file, $sk );
1277                 // Add show/hide deletion links if available
1278                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1279                 if( $canHide || ($file->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1280                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1281                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1282                         } else {
1283                                 $query = array(
1284                                         'type' => 'filearchive',
1285                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1286                                         'ids' => $row->fa_id
1287                                 );
1288                                 $revdlink = $sk->revDeleteLink( $query,
1289                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1290                         }
1291                 } else {
1292                         $revdlink = '';
1293                 }
1294                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1295         }
1296
1297         /**
1298          * Fetch revision text link if it's available to all users
1299          * @return string
1300          */
1301         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1302                 global $wgLang;
1303
1304                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1305
1306                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1307                         return '<span class="history-deleted">' . $time . '</span>';
1308                 } else {
1309                         $link = $sk->linkKnown(
1310                                 $titleObj,
1311                                 $time,
1312                                 array(),
1313                                 array(
1314                                         'target' => $this->mTargetObj->getPrefixedText(),
1315                                         'timestamp' => $ts
1316                                 )
1317                         );
1318                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1319                                 $link = '<span class="history-deleted">' . $link . '</span>';
1320                         return $link;
1321                 }
1322         }
1323
1324         /**
1325          * Fetch image view link if it's available to all users
1326          *
1327          * @return String: HTML fragment
1328          */
1329         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1330                 global $wgLang, $wgUser;
1331
1332                 if( !$file->userCan(File::DELETED_FILE) ) {
1333                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1334                 } else {
1335                         $link = $sk->linkKnown(
1336                                 $titleObj,
1337                                 $wgLang->timeanddate( $ts, true ),
1338                                 array(),
1339                                 array(
1340                                         'target' => $this->mTargetObj->getPrefixedText(),
1341                                         'file' => $key,
1342                                         'token' => $wgUser->editToken( $key )
1343                                 )
1344                         );
1345                         if( $file->isDeleted(File::DELETED_FILE) )
1346                                 $link = '<span class="history-deleted">' . $link . '</span>';
1347                         return $link;
1348                 }
1349         }
1350
1351         /**
1352          * Fetch file's user id if it's available to this user
1353          *
1354          * @return String: HTML fragment
1355          */
1356         function getFileUser( $file, $sk ) {
1357                 if( !$file->userCan(File::DELETED_USER) ) {
1358                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1359                 } else {
1360                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1361                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1362                         if( $file->isDeleted(File::DELETED_USER) )
1363                                 $link = '<span class="history-deleted">' . $link . '</span>';
1364                         return $link;
1365                 }
1366         }
1367
1368         /**
1369          * Fetch file upload comment if it's available to this user
1370          *
1371          * @return String: HTML fragment
1372          */
1373         function getFileComment( $file, $sk ) {
1374                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1375                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1376                 } else {
1377                         $link = $sk->commentBlock( $file->getRawDescription() );
1378                         if( $file->isDeleted(File::DELETED_COMMENT) )
1379                                 $link = '<span class="history-deleted">' . $link . '</span>';
1380                         return $link;
1381                 }
1382         }
1383
1384         function undelete() {
1385                 global $wgOut, $wgUser;
1386                 if ( wfReadOnly() ) {
1387                         $wgOut->readOnlyPage();
1388                         return;
1389                 }
1390                 if( !is_null( $this->mTargetObj ) ) {
1391                         $archive = new PageArchive( $this->mTargetObj );
1392                         $ok = $archive->undelete(
1393                                 $this->mTargetTimestamp,
1394                                 $this->mComment,
1395                                 $this->mFileVersions,
1396                                 $this->mUnsuppress );
1397
1398                         if( is_array($ok) ) {
1399                                 if ( $ok[1] ) // Undeleted file count
1400                                         wfRunHooks( 'FileUndeleteComplete', array(
1401                                                 $this->mTargetObj, $this->mFileVersions,
1402                                                 $wgUser, $this->mComment) );
1403
1404                                 $skin = $wgUser->getSkin();
1405                                 $link = $skin->linkKnown( $this->mTargetObj );
1406                                 $wgOut->addHTML( wfMsgWikiHtml( 'undeletedpage', $link ) );
1407                         } else {
1408                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1409                                 $wgOut->addHTML( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1410                         }
1411
1412                         // Show file deletion warnings and errors
1413                         $status = $archive->getFileStatus();
1414                         if( $status && !$status->isGood() ) {
1415                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1416                         }
1417                 } else {
1418                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1419                 }
1420                 return false;
1421         }
1422 }