includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30         protected $title;
  31         var $fileStatus;
  32
  33         function __construct( $title ) {
  34                 if( is_null( $title ) ) {
  35                         throw new MWException( __METHOD__ . ' given a null title.' );
  36                 }
  37                 $this->title = $title;
  38         }
  39
  40         /**
  41          * List all deleted pages recorded in the archive table. Returns result
  42          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  43          * namespace/title.
  44          *
  45          * @return ResultWrapper
  46          */
  47         public static function listAllPages() {
  48                 $dbr = wfGetDB( DB_SLAVE );
  49                 return self::listPages( $dbr, '' );
  50         }
  51
  52         /**
  53          * List deleted pages recorded in the archive table matching the
  54          * given title prefix.
  55          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  56          *
  57          * @param $prefix String: title prefix
  58          * @return ResultWrapper
  59          */
  60         public static function listPagesByPrefix( $prefix ) {
  61                 $dbr = wfGetDB( DB_SLAVE );
  62
  63                 $title = Title::newFromText( $prefix );
  64                 if( $title ) {
  65                         $ns = $title->getNamespace();
  66                         $prefix = $title->getDBkey();
  67                 } else {
  68                         // Prolly won't work too good
  69                         // @todo handle bare namespace names cleanly?
  70                         $ns = 0;
  71                 }
  72                 $conds = array(
  73                         'ar_namespace' => $ns,
  74                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  75                 );
  76                 return self::listPages( $dbr, $conds );
  77         }
  78
  79         protected static function listPages( $dbr, $condition ) {
  80                 return $dbr->resultObject(
  81                         $dbr->select(
  82                                 array( 'archive' ),
  83                                 array(
  84                                         'ar_namespace',
  85                                         'ar_title',
  86                                         'COUNT(*) AS count'
  87                                 ),
  88                                 $condition,
  89                                 __METHOD__,
  90                                 array(
  91                                         'GROUP BY' => 'ar_namespace,ar_title',
  92                                         'ORDER BY' => 'ar_namespace,ar_title',
  93                                         'LIMIT' => 100,
  94                                 )
  95                         )
  96                 );
  97         }
  98
  99         /**
 100          * List the revisions of the given page. Returns result wrapper with
 101          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 102          *
 103          * @return ResultWrapper
 104          */
 105         function listRevisions() {
 106                 $dbr = wfGetDB( DB_SLAVE );
 107                 $res = $dbr->select( 'archive',
 108                         array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment', 'ar_len', 'ar_deleted' ),
 109                         array( 'ar_namespace' => $this->title->getNamespace(),
 110                                'ar_title' => $this->title->getDBkey() ),
 111                         'PageArchive::listRevisions',
 112                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 113                 $ret = $dbr->resultObject( $res );
 114                 return $ret;
 115         }
 116
 117         /**
 118          * List the deleted file revisions for this page, if it's a file page.
 119          * Returns a result wrapper with various filearchive fields, or null
 120          * if not a file page.
 121          *
 122          * @return ResultWrapper
 123          * @todo Does this belong in Image for fuller encapsulation?
 124          */
 125         function listFiles() {
 126                 if( $this->title->getNamespace() == NS_FILE ) {
 127                         $dbr = wfGetDB( DB_SLAVE );
 128                         $res = $dbr->select( 'filearchive',
 129                                 array(
 130                                         'fa_id',
 131                                         'fa_name',
 132                                         'fa_archive_name',
 133                                         'fa_storage_key',
 134                                         'fa_storage_group',
 135                                         'fa_size',
 136                                         'fa_width',
 137                                         'fa_height',
 138                                         'fa_bits',
 139                                         'fa_metadata',
 140                                         'fa_media_type',
 141                                         'fa_major_mime',
 142                                         'fa_minor_mime',
 143                                         'fa_description',
 144                                         'fa_user',
 145                                         'fa_user_text',
 146                                         'fa_timestamp',
 147                                         'fa_deleted' ),
 148                                 array( 'fa_name' => $this->title->getDBkey() ),
 149                                 __METHOD__,
 150                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 151                         $ret = $dbr->resultObject( $res );
 152                         return $ret;
 153                 }
 154                 return null;
 155         }
 156
 157         /**
 158          * Fetch (and decompress if necessary) the stored text for the deleted
 159          * revision of the page with the given timestamp.
 160          *
 161          * @param $timestamp String
 162          * @return String
 163          * @deprecated Use getRevision() for more flexible information
 164          */
 165         function getRevisionText( $timestamp ) {
 166                 $rev = $this->getRevision( $timestamp );
 167                 return $rev ? $rev->getText() : null;
 168         }
 169
 170         /**
 171          * Return a Revision object containing data for the deleted revision.
 172          * Note that the result *may* or *may not* have a null page ID.
 173          *
 174          * @param $timestamp String
 175          * @return Revision
 176          */
 177         function getRevision( $timestamp ) {
 178                 $dbr = wfGetDB( DB_SLAVE );
 179                 $row = $dbr->selectRow( 'archive',
 180                         array(
 181                                 'ar_rev_id',
 182                                 'ar_text',
 183                                 'ar_comment',
 184                                 'ar_user',
 185                                 'ar_user_text',
 186                                 'ar_timestamp',
 187                                 'ar_minor_edit',
 188                                 'ar_flags',
 189                                 'ar_text_id',
 190                                 'ar_deleted',
 191                                 'ar_len' ),
 192                         array( 'ar_namespace' => $this->title->getNamespace(),
 193                                'ar_title' => $this->title->getDBkey(),
 194                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 195                         __METHOD__ );
 196                 if( $row ) {
 197                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 198                 } else {
 199                         return null;
 200                 }
 201         }
 202
 203         /**
 204          * Return the most-previous revision, either live or deleted, against
 205          * the deleted revision given by timestamp.
 206          *
 207          * May produce unexpected results in case of history merges or other
 208          * unusual time issues.
 209          *
 210          * @param $timestamp String
 211          * @return Revision or null
 212          */
 213         function getPreviousRevision( $timestamp ) {
 214                 $dbr = wfGetDB( DB_SLAVE );
 215
 216                 // Check the previous deleted revision...
 217                 $row = $dbr->selectRow( 'archive',
 218                         'ar_timestamp',
 219                         array( 'ar_namespace' => $this->title->getNamespace(),
 220                                'ar_title' => $this->title->getDBkey(),
 221                                'ar_timestamp < ' .
 222                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 223                         __METHOD__,
 224                         array(
 225                                 'ORDER BY' => 'ar_timestamp DESC',
 226                                 'LIMIT' => 1 ) );
 227                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 228
 229                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 230                         array( 'rev_id', 'rev_timestamp' ),
 231                         array(
 232                                 'page_namespace' => $this->title->getNamespace(),
 233                                 'page_title' => $this->title->getDBkey(),
 234                                 'page_id = rev_page',
 235                                 'rev_timestamp < ' .
 236                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 237                         __METHOD__,
 238                         array(
 239                                 'ORDER BY' => 'rev_timestamp DESC',
 240                                 'LIMIT' => 1 ) );
 241                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 242                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 243
 244                 if( $prevLive && $prevLive > $prevDeleted ) {
 245                         // Most prior revision was live
 246                         return Revision::newFromId( $prevLiveId );
 247                 } elseif( $prevDeleted ) {
 248                         // Most prior revision was deleted
 249                         return $this->getRevision( $prevDeleted );
 250                 } else {
 251                         // No prior revision on this page.
 252                         return null;
 253                 }
 254         }
 255
 256         /**
 257          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 258          *
 259          * @param $row Object: database row
 260          * @return Revision
 261          */
 262         function getTextFromRow( $row ) {
 263                 if( is_null( $row->ar_text_id ) ) {
 264                         // An old row from MediaWiki 1.4 or previous.
 265                         // Text is embedded in this row in classic compression format.
 266                         return Revision::getRevisionText( $row, "ar_" );
 267                 } else {
 268                         // New-style: keyed to the text storage backend.
 269                         $dbr = wfGetDB( DB_SLAVE );
 270                         $text = $dbr->selectRow( 'text',
 271                                 array( 'old_text', 'old_flags' ),
 272                                 array( 'old_id' => $row->ar_text_id ),
 273                                 __METHOD__ );
 274                         return Revision::getRevisionText( $text );
 275                 }
 276         }
 277
 278
 279         /**
 280          * Fetch (and decompress if necessary) the stored text of the most
 281          * recently edited deleted revision of the page.
 282          *
 283          * If there are no archived revisions for the page, returns NULL.
 284          *
 285          * @return String
 286          */
 287         function getLastRevisionText() {
 288                 $dbr = wfGetDB( DB_SLAVE );
 289                 $row = $dbr->selectRow( 'archive',
 290                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 291                         array( 'ar_namespace' => $this->title->getNamespace(),
 292                                'ar_title' => $this->title->getDBkey() ),
 293                         __METHOD__,
 294                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 295                 if( $row ) {
 296                         return $this->getTextFromRow( $row );
 297                 } else {
 298                         return null;
 299                 }
 300         }
 301
 302         /**
 303          * Quick check if any archived revisions are present for the page.
 304          *
 305          * @return Boolean
 306          */
 307         function isDeleted() {
 308                 $dbr = wfGetDB( DB_SLAVE );
 309                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 310                         array( 'ar_namespace' => $this->title->getNamespace(),
 311                                'ar_title' => $this->title->getDBkey() ) );
 312                 return ($n > 0);
 313         }
 314
 315         /**
 316          * Restore the given (or all) text and file revisions for the page.
 317          * Once restored, the items will be removed from the archive tables.
 318          * The deletion log will be updated with an undeletion notice.
 319          *
 320          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 321          * @param $comment String
 322          * @param $fileVersions Array
 323          * @param $unsuppress Boolean
 324          *
 325          * @return array(number of file revisions restored, number of image revisions restored, log message)
 326          * on success, false on failure
 327          */
 328         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 329                 // If both the set of text revisions and file revisions are empty,
 330                 // restore everything. Otherwise, just restore the requested items.
 331                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 332
 333                 $restoreText = $restoreAll || !empty( $timestamps );
 334                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 335
 336                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 337                         $img = wfLocalFile( $this->title );
 338                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 339                         if ( !$this->fileStatus->isOk() ) {
 340                                 return false;
 341                         }
 342                         $filesRestored = $this->fileStatus->successCount;
 343                 } else {
 344                         $filesRestored = 0;
 345                 }
 346
 347                 if( $restoreText ) {
 348                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 349                         if($textRestored === false) // It must be one of UNDELETE_*
 350                                 return false;
 351                 } else {
 352                         $textRestored = 0;
 353                 }
 354
 355                 // Touch the log!
 356                 global $wgContLang;
 357                 $log = new LogPage( 'delete' );
 358
 359                 if( $textRestored && $filesRestored ) {
 360                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 361                                 $wgContLang->formatNum( $textRestored ),
 362                                 $wgContLang->formatNum( $filesRestored ) );
 363                 } elseif( $textRestored ) {
 364                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 365                                 $wgContLang->formatNum( $textRestored ) );
 366                 } elseif( $filesRestored ) {
 367                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 368                                 $wgContLang->formatNum( $filesRestored ) );
 369                 } else {
 370                         wfDebug( "Undelete: nothing undeleted...\n" );
 371                         return false;
 372                 }
 373
 374                 if( trim( $comment ) != '' )
 375                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 376                 $log->addEntry( 'restore', $this->title, $reason );
 377
 378                 return array($textRestored, $filesRestored, $reason);
 379         }
 380
 381         /**
 382          * This is the meaty bit -- restores archived revisions of the given page
 383          * to the cur/old tables. If the page currently exists, all revisions will
 384          * be stuffed into old, otherwise the most recent will go into cur.
 385          *
 386          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 387          * @param $comment String
 388          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 389          *
 390          * @return Mixed: number of revisions restored or false on failure
 391          */
 392         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 393                 if ( wfReadOnly() )
 394                         return false;
 395                 $restoreAll = empty( $timestamps );
 396
 397                 $dbw = wfGetDB( DB_MASTER );
 398
 399                 # Does this page already exist? We'll have to update it...
 400                 $article = new Article( $this->title );
 401                 $options = 'FOR UPDATE'; // lock page
 402                 $page = $dbw->selectRow( 'page',
 403                         array( 'page_id', 'page_latest' ),
 404                         array( 'page_namespace' => $this->title->getNamespace(),
 405                                'page_title'     => $this->title->getDBkey() ),
 406                         __METHOD__,
 407                         $options
 408                 );
 409                 if( $page ) {
 410                         $makepage = false;
 411                         # Page already exists. Import the history, and if necessary
 412                         # we'll update the latest revision field in the record.
 413                         $newid             = 0;
 414                         $pageId            = $page->page_id;
 415                         $previousRevId    = $page->page_latest;
 416                         # Get the time span of this page
 417                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 418                                 array( 'rev_id' => $previousRevId ),
 419                                 __METHOD__ );
 420                         if( $previousTimestamp === false ) {
 421                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 422                                 return 0;
 423                         }
 424                 } else {
 425                         # Have to create a new article...
 426                         $makepage = true;
 427                         $previousRevId = 0;
 428                         $previousTimestamp = 0;
 429                 }
 430
 431                 if( $restoreAll ) {
 432                         $oldones = '1 = 1'; # All revisions...
 433                 } else {
 434                         $oldts = implode( ',',
 435                                 array_map( array( &$dbw, 'addQuotes' ),
 436                                         array_map( array( &$dbw, 'timestamp' ),
 437                                                 $timestamps ) ) );
 438
 439                         $oldones = "ar_timestamp IN ( {$oldts} )";
 440                 }
 441
 442                 /**
 443                  * Select each archived revision...
 444                  */
 445                 $result = $dbw->select( 'archive',
 446                         /* fields */ array(
 447                                 'ar_rev_id',
 448                                 'ar_text',
 449                                 'ar_comment',
 450                                 'ar_user',
 451                                 'ar_user_text',
 452                                 'ar_timestamp',
 453                                 'ar_minor_edit',
 454                                 'ar_flags',
 455                                 'ar_text_id',
 456                                 'ar_deleted',
 457                                 'ar_page_id',
 458                                 'ar_len' ),
 459                         /* WHERE */ array(
 460                                 'ar_namespace' => $this->title->getNamespace(),
 461                                 'ar_title'     => $this->title->getDBkey(),
 462                                 $oldones ),
 463                         __METHOD__,
 464                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 465                 );
 466                 $ret = $dbw->resultObject( $result );
 467                 $rev_count = $dbw->numRows( $result );
 468                 if( !$rev_count ) {
 469                         wfDebug( __METHOD__.": no revisions to restore\n" );
 470                         return false; // ???
 471                 }
 472
 473                 $ret->seek( $rev_count - 1 ); // move to last
 474                 $row = $ret->fetchObject(); // get newest archived rev
 475                 $ret->seek( 0 ); // move back
 476
 477                 if( $makepage ) {
 478                         // Check the state of the newest to-be version...
 479                         if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 480                                 return false; // we can't leave the current revision like this!
 481                         }
 482                         // Safe to insert now...
 483                         $newid  = $article->insertOn( $dbw );
 484                         $pageId = $newid;
 485                 } else {
 486                         // Check if a deleted revision will become the current revision...
 487                         if( $row->ar_timestamp > $previousTimestamp ) {
 488                                 // Check the state of the newest to-be version...
 489                                 if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 490                                         return false; // we can't leave the current revision like this!
 491                                 }
 492                         }
 493                 }
 494
 495                 $revision = null;
 496                 $restored = 0;
 497
 498                 foreach ( $ret as $row ) {
 499                         // Check for key dupes due to shitty archive integrity.
 500                         if( $row->ar_rev_id ) {
 501                                 $exists = $dbw->selectField( 'revision', '1', array('rev_id' => $row->ar_rev_id), __METHOD__ );
 502                                 if( $exists ) continue; // don't throw DB errors
 503                         }
 504                         // Insert one revision at a time...maintaining deletion status
 505                         // unless we are specifically removing all restrictions...
 506                         $revision = Revision::newFromArchiveRow( $row,
 507                                 array(
 508                                         'page' => $pageId,
 509                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 510                                 ) );
 511
 512                         $revision->insertOn( $dbw );
 513                         $restored++;
 514
 515                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 516                 }
 517                 # Now that it's safely stored, take it out of the archive
 518                 $dbw->delete( 'archive',
 519                         /* WHERE */ array(
 520                                 'ar_namespace' => $this->title->getNamespace(),
 521                                 'ar_title' => $this->title->getDBkey(),
 522                                 $oldones ),
 523                         __METHOD__ );
 524
 525                 // Was anything restored at all?
 526                 if( $restored == 0 )
 527                         return 0;
 528
 529                 if( $revision ) {
 530                         // Attach the latest revision to the page...
 531                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 532                         if( $newid || $wasnew ) {
 533                                 // Update site stats, link tables, etc
 534                                 $article->createUpdates( $revision );
 535                         }
 536
 537                         if( $newid ) {
 538                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true, $comment ) );
 539                                 Article::onArticleCreate( $this->title );
 540                         } else {
 541                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false, $comment ) );
 542                                 Article::onArticleEdit( $this->title );
 543                         }
 544
 545                         if( $this->title->getNamespace() == NS_FILE ) {
 546                                 $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 547                                 $update->doUpdate();
 548                         }
 549                 } else {
 550                         // Revision couldn't be created. This is very weird
 551                         wfDebug( "Undelete: unknown error...\n" );
 552                         return false;
 553                 }
 554
 555                 return $restored;
 556         }
 557
 558         function getFileStatus() { return $this->fileStatus; }
 559 }
 560
 561 /**
 562  * Special page allowing users with the appropriate permissions to view
 563  * and restore deleted content.
 564  *
 565  * @ingroup SpecialPage
 566  */
 567 class SpecialUndelete extends SpecialPage {
 568         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj;
 569         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 570
 571         function __construct( $request = null ) {
 572                 parent::__construct( 'Undelete', 'deletedhistory' );
 573
 574                 if ( $request === null ) {
 575                         global $wgRequest;
 576                         $this->mRequest = $wgRequest;
 577                 } else {
 578                         $this->mRequest = $request;
 579                 }
 580         }
 581
 582         function loadRequest() {
 583                 global $wgUser;
 584                 $this->mAction = $this->mRequest->getVal( 'action' );
 585                 $this->mTarget = $this->mRequest->getVal( 'target' );
 586                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 587                 $time = $this->mRequest->getVal( 'timestamp' );
 588                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 589                 $this->mFile = $this->mRequest->getVal( 'file' );
 590
 591                 $posted = $this->mRequest->wasPosted() &&
 592                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 593                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 594                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 595                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 596                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 597                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 598                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 599                 $this->mToken = $this->mRequest->getVal( 'token' );
 600
 601                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 602                         $this->mAllowed = true; // user can restore
 603                         $this->mCanView = true; // user can view content
 604                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 605                         $this->mAllowed = false; // user cannot restore
 606                         $this->mCanView = true; // user can view content
 607                 }  else { // user can only view the list of revisions
 608                         $this->mAllowed = false;
 609                         $this->mCanView = false;
 610                         $this->mTimestamp = '';
 611                         $this->mRestore = false;
 612                 }
 613
 614                 if( $this->mRestore || $this->mInvert ) {
 615                         $timestamps = array();
 616                         $this->mFileVersions = array();
 617                         foreach( $_REQUEST as $key => $val ) {
 618                                 $matches = array();
 619                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 620                                         array_push( $timestamps, $matches[1] );
 621                                 }
 622
 623                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 624                                         $this->mFileVersions[] = intval( $matches[1] );
 625                                 }
 626                         }
 627                         rsort( $timestamps );
 628                         $this->mTargetTimestamp = $timestamps;
 629                 }
 630         }
 631
 632         function execute( $par ) {
 633                 global $wgOut, $wgUser;
 634
 635                 $this->setHeaders();
 636                 if ( !$this->userCanExecute( $wgUser ) ) {
 637                         $this->displayRestrictionError();
 638                         return;
 639                 }
 640                 $this->outputHeader();
 641
 642                 $this->loadRequest();
 643
 644                 if ( $this->mAllowed ) {
 645                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 646                 } else {
 647                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 648                 }
 649
 650                 if( $par != '' ) {
 651                         $this->mTarget = $par;
 652                 }
 653                 if ( $this->mTarget !== '' ) {
 654                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 655                         $wgUser->getSkin()->setRelevantTitle( $this->mTargetObj );
 656                 } else {
 657                         $this->mTargetObj = null;
 658                 }
 659
 660                 if( is_null( $this->mTargetObj ) ) {
 661                 # Not all users can just browse every deleted page from the list
 662                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 663                                 $this->showSearchForm();
 664
 665                                 # List undeletable articles
 666                                 if( $this->mSearchPrefix ) {
 667                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 668                                         $this->showList( $result );
 669                                 }
 670                         } else {
 671                                 $wgOut->addWikiMsg( 'undelete-header' );
 672                         }
 673                         return;
 674                 }
 675                 if( $this->mTimestamp !== '' ) {
 676                         return $this->showRevision( $this->mTimestamp );
 677                 }
 678                 if( $this->mFile !== null ) {
 679                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 680                         // Check if user is allowed to see this file
 681                         if ( !$file->exists() ) {
 682                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFile );
 683                                 return;
 684                         } else if( !$file->userCan( File::DELETED_FILE ) ) {
 685                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 686                                         $wgOut->permissionRequired( 'suppressrevision' );
 687                                 } else {
 688                                         $wgOut->permissionRequired( 'deletedtext' );
 689                                 }
 690                                 return false;
 691                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFile ) ) {
 692                                 $this->showFileConfirmationForm( $this->mFile );
 693                                 return false;
 694                         } else {
 695                                 return $this->showFile( $this->mFile );
 696                         }
 697                 }
 698                 if( $this->mRestore && $this->mAction == "submit" ) {
 699                         global $wgUploadMaintenance;
 700                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 701                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 702                                 return;
 703                         }
 704                         return $this->undelete();
 705                 }
 706                 if( $this->mInvert && $this->mAction == "submit" ) {
 707                         return $this->showHistory( );
 708                 }
 709                 return $this->showHistory();
 710         }
 711
 712         function showSearchForm() {
 713                 global $wgOut, $wgScript;
 714                 $wgOut->addWikiMsg( 'undelete-header' );
 715
 716                 $wgOut->addHTML(
 717                         Xml::openElement( 'form', array(
 718                                 'method' => 'get',
 719                                 'action' => $wgScript ) ) .
 720                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 721                         Html::hidden( 'title',
 722                                 $this->getTitle()->getPrefixedDbKey() ) .
 723                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 724                                 'prefix', 'prefix', 20,
 725                                 $this->mSearchPrefix ) . ' ' .
 726                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 727                         Xml::closeElement( 'fieldset' ) .
 728                         Xml::closeElement( 'form' )
 729                 );
 730         }
 731
 732         // Generic list of deleted pages
 733         private function showList( $result ) {
 734                 global $wgLang, $wgUser, $wgOut;
 735
 736                 if( $result->numRows() == 0 ) {
 737                         $wgOut->addWikiMsg( 'undelete-no-results' );
 738                         return;
 739                 }
 740
 741                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 742
 743                 $sk = $wgUser->getSkin();
 744                 $undelete = $this->getTitle();
 745                 $wgOut->addHTML( "<ul>\n" );
 746                 foreach ( $result as $row ) {
 747                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 748                         $link = $sk->linkKnown(
 749                                 $undelete,
 750                                 htmlspecialchars( $title->getPrefixedText() ),
 751                                 array(),
 752                                 array( 'target' => $title->getPrefixedText() )
 753                         );
 754                         $revs = wfMsgExt( 'undeleterevisions',
 755                                 array( 'parseinline' ),
 756                                 $wgLang->formatNum( $row->count ) );
 757                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 758                 }
 759                 $result->free();
 760                 $wgOut->addHTML( "</ul>\n" );
 761
 762                 return true;
 763         }
 764
 765         private function showRevision( $timestamp ) {
 766                 global $wgLang, $wgUser, $wgOut;
 767
 768                 $skin = $wgUser->getSkin();
 769
 770                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 771
 772                 $archive = new PageArchive( $this->mTargetObj );
 773                 $rev = $archive->getRevision( $timestamp );
 774
 775                 if( !$rev ) {
 776                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 777                         return;
 778                 }
 779
 780                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 781                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 782                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 783                                 return;
 784                         } else {
 785                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 786                                 $wgOut->addHTML( '<br />' );
 787                                 // and we are allowed to see...
 788                         }
 789                 }
 790
 791                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 792
 793                 $link = $skin->linkKnown(
 794                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 795                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 796                 );
 797
 798                 if( $this->mDiff ) {
 799                         $previousRev = $archive->getPreviousRevision( $timestamp );
 800                         if( $previousRev ) {
 801                                 $this->showDiff( $previousRev, $rev );
 802                                 if( $wgUser->getOption( 'diffonly' ) ) {
 803                                         return;
 804                                 } else {
 805                                         $wgOut->addHTML( '<hr />' );
 806                                 }
 807                         } else {
 808                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 809                         }
 810                 }
 811
 812                 // date and time are separate parameters to facilitate localisation.
 813                 // $time is kept for backward compat reasons.
 814                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 815                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 816                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 817                 $user = $skin->revUserTools( $rev );
 818
 819                 if( $this->mPreview ) {
 820                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 821                 } else {
 822                         $openDiv = '<div id="mw-undelete-revision">';
 823                 }
 824
 825                 // Revision delete links
 826                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 827                 if( $this->mDiff ) {
 828                         $revdlink = ''; // diffs already have revision delete links
 829                 } else if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
 830                         if( !$rev->userCan(Revision::DELETED_RESTRICTED ) ) {
 831                                 $revdlink = $skin->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 832                         } else {
 833                                 $query = array(
 834                                         'type'   => 'archive',
 835                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
 836                                         'ids'    => $rev->getTimestamp()
 837                                 );
 838                                 $revdlink = $skin->revDeleteLink( $query,
 839                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide );
 840                         }
 841                 } else {
 842                         $revdlink = '';
 843                 }
 844
 845                 $wgOut->addHTML( $openDiv . $revdlink . wfMsgWikiHtml( 'undelete-revision', $link, $time, $user, $d, $t ) . '</div>' );
 846                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 847
 848                 if( $this->mPreview ) {
 849                         //Hide [edit]s
 850                         $popts = $wgOut->parserOptions();
 851                         $popts->setEditSection( false );
 852                         $wgOut->parserOptions( $popts );
 853                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 854                 }
 855
 856                 $wgOut->addHTML(
 857                         Xml::element( 'textarea', array(
 858                                         'readonly' => 'readonly',
 859                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 860                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 861                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 862                         Xml::openElement( 'div' ) .
 863                         Xml::openElement( 'form', array(
 864                                 'method' => 'post',
 865                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 866                         Xml::element( 'input', array(
 867                                 'type' => 'hidden',
 868                                 'name' => 'target',
 869                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 870                         Xml::element( 'input', array(
 871                                 'type' => 'hidden',
 872                                 'name' => 'timestamp',
 873                                 'value' => $timestamp ) ) .
 874                         Xml::element( 'input', array(
 875                                 'type' => 'hidden',
 876                                 'name' => 'wpEditToken',
 877                                 'value' => $wgUser->editToken() ) ) .
 878                         Xml::element( 'input', array(
 879                                 'type' => 'submit',
 880                                 'name' => 'preview',
 881                                 'value' => wfMsg( 'showpreview' ) ) ) .
 882                         Xml::element( 'input', array(
 883                                 'name' => 'diff',
 884                                 'type' => 'submit',
 885                                 'value' => wfMsg( 'showdiff' ) ) ) .
 886                         Xml::closeElement( 'form' ) .
 887                         Xml::closeElement( 'div' ) );
 888         }
 889
 890         /**
 891          * Build a diff display between this and the previous either deleted
 892          * or non-deleted edit.
 893          *
 894          * @param $previousRev Revision
 895          * @param $currentRev Revision
 896          * @return String: HTML
 897          */
 898         function showDiff( $previousRev, $currentRev ) {
 899                 global $wgOut;
 900
 901                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 902                 $diffEngine->showDiffStyle();
 903                 $wgOut->addHTML(
 904                         "<div>" .
 905                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 906                         "<col class='diff-marker' />" .
 907                         "<col class='diff-content' />" .
 908                         "<col class='diff-marker' />" .
 909                         "<col class='diff-content' />" .
 910                         "<tr>" .
 911                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 912                                 $this->diffHeader( $previousRev, 'o' ) .
 913                                 "</td>\n" .
 914                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 915                                 $this->diffHeader( $currentRev, 'n' ) .
 916                                 "</td>\n" .
 917                         "</tr>" .
 918                         $diffEngine->generateDiffBody(
 919                                 $previousRev->getText(), $currentRev->getText() ) .
 920                         "</table>" .
 921                         "</div>\n"
 922                 );
 923         }
 924
 925         private function diffHeader( $rev, $prefix ) {
 926                 global $wgUser, $wgLang;
 927                 $sk = $wgUser->getSkin();
 928                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 929                 if( $isDeleted ) {
 930                         /// @todo Fixme: $rev->getTitle() is null for deleted revs...?
 931                         $targetPage = $this->getTitle();
 932                         $targetQuery = array(
 933                                 'target' => $this->mTargetObj->getPrefixedText(),
 934                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 935                         );
 936                 } else {
 937                         /// @todo Fixme getId() may return non-zero for deleted revs...
 938                         $targetPage = $rev->getTitle();
 939                         $targetQuery = array( 'oldid' => $rev->getId() );
 940                 }
 941                 // Add show/hide deletion links if available
 942                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 943                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
 944                         $del = ' ';
 945                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 946                                 $del .= $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 947                         } else {
 948                                 $query = array(
 949                                         'type'   => 'archive',
 950                                         'target' => $this->mTargetObj->getPrefixedDbkey(),
 951                                         'ids'    => $rev->getTimestamp()
 952                                 );
 953                                 $del .= $sk->revDeleteLink( $query,
 954                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
 955                         }
 956                 } else {
 957                         $del = '';
 958                 }
 959                 return
 960                         '<div id="mw-diff-'.$prefix.'title1"><strong>' .
 961                                 $sk->link(
 962                                         $targetPage,
 963                                         wfMsgHtml(
 964                                                 'revisionasof',
 965                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 966                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
 967                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
 968                                         ),
 969                                         array(),
 970                                         $targetQuery
 971                                 ) .
 972                         '</strong></div>' .
 973                         '<div id="mw-diff-'.$prefix.'title2">' .
 974                                 $sk->revUserTools( $rev ) . '<br />' .
 975                         '</div>' .
 976                         '<div id="mw-diff-'.$prefix.'title3">' .
 977                                 $sk->revComment( $rev ) . $del . '<br />' .
 978                         '</div>';
 979         }
 980
 981         /**
 982          * Show a form confirming whether a tokenless user really wants to see a file
 983          */
 984         private function showFileConfirmationForm( $key ) {
 985                 global $wgOut, $wgUser, $wgLang;
 986                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 987                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
 988                         $this->mTargetObj->getText(),
 989                         $wgLang->date( $file->getTimestamp() ),
 990                         $wgLang->time( $file->getTimestamp() ) );
 991                 $wgOut->addHTML(
 992                         Xml::openElement( 'form', array(
 993                                 'method' => 'POST',
 994                                 'action' => $this->getTitle()->getLocalUrl(
 995                                         'target=' . urlencode( $this->mTarget ) .
 996                                         '&file=' . urlencode( $key ) .
 997                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
 998                                 )
 999                         ) .
1000                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
1001                         '</form>'
1002                 );
1003         }
1004
1005         /**
1006          * Show a deleted file version requested by the visitor.
1007          */
1008         private function showFile( $key ) {
1009                 global $wgOut, $wgRequest;
1010                 $wgOut->disable();
1011
1012                 # We mustn't allow the output to be Squid cached, otherwise
1013                 # if an admin previews a deleted image, and it's cached, then
1014                 # a user without appropriate permissions can toddle off and
1015                 # nab the image, and Squid will serve it
1016                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1017                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1018                 $wgRequest->response()->header( 'Pragma: no-cache' );
1019
1020                 global $IP;
1021                 require_once( "$IP/includes/StreamFile.php" );
1022                 $repo = RepoGroup::singleton()->getLocalRepo();
1023                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1024                 wfStreamFile( $path );
1025         }
1026
1027         private function showHistory( ) {
1028                 global $wgUser, $wgOut;
1029
1030                 $sk = $wgUser->getSkin();
1031                 if( $this->mAllowed ) {
1032                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
1033                 } else {
1034                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
1035                 }
1036
1037                 $wgOut->wrapWikiMsg(  "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n", array ( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() ) );
1038
1039                 $archive = new PageArchive( $this->mTargetObj );
1040                 /*
1041                 $text = $archive->getLastRevisionText();
1042                 if( is_null( $text ) ) {
1043                         $wgOut->addWikiMsg( "nohistory" );
1044                         return;
1045                 }
1046                 */
1047                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1048                 if ( $this->mAllowed ) {
1049                         $wgOut->addWikiMsg( "undeletehistory" );
1050                         $wgOut->addWikiMsg( "undeleterevdel" );
1051                 } else {
1052                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
1053                 }
1054                 $wgOut->addHTML( '</div>' );
1055
1056                 # List all stored revisions
1057                 $revisions = $archive->listRevisions();
1058                 $files = $archive->listFiles();
1059
1060                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1061                 $haveFiles = $files && $files->numRows() > 0;
1062
1063                 # Batch existence check on user and talk pages
1064                 if( $haveRevisions ) {
1065                         $batch = new LinkBatch();
1066                         foreach ( $revisions as $row ) {
1067                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1068                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1069                         }
1070                         $batch->execute();
1071                         $revisions->seek( 0 );
1072                 }
1073                 if( $haveFiles ) {
1074                         $batch = new LinkBatch();
1075                         foreach ( $files as $row ) {
1076                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1077                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1078                         }
1079                         $batch->execute();
1080                         $files->seek( 0 );
1081                 }
1082
1083                 if ( $this->mAllowed ) {
1084                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1085                         # Start the form here
1086                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1087                         $wgOut->addHTML( $top );
1088                 }
1089
1090                 # Show relevant lines from the deletion log:
1091                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1092                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1093                 # Show relevant lines from the suppression log:
1094                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1095                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1096                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1097                 }
1098
1099                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1100                         # Format the user-visible controls (comment field, submission button)
1101                         # in a nice little table
1102                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1103                                 $unsuppressBox =
1104                                         "<tr>
1105                                                 <td>&#160;</td>
1106                                                 <td class='mw-input'>" .
1107                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
1108                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1109                                                 "</td>
1110                                         </tr>";
1111                         } else {
1112                                 $unsuppressBox = "";
1113                         }
1114                         $table =
1115                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1116                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1117                                         "<tr>
1118                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1119                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
1120                                                 "</td>
1121                                         </tr>
1122                                         <tr>
1123                                                 <td class='mw-label'>" .
1124                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1125                                                 "</td>
1126                                                 <td class='mw-input'>" .
1127                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1128                                                 "</td>
1129                                         </tr>
1130                                         <tr>
1131                                                 <td>&#160;</td>
1132                                                 <td class='mw-submit'>" .
1133                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1134                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) . ' ' .
1135                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1136                                                 "</td>
1137                                         </tr>" .
1138                                         $unsuppressBox .
1139                                 Xml::closeElement( 'table' ) .
1140                                 Xml::closeElement( 'fieldset' );
1141
1142                         $wgOut->addHTML( $table );
1143                 }
1144
1145                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1146
1147                 if( $haveRevisions ) {
1148                         # The page's stored (deleted) history:
1149                         $wgOut->addHTML("<ul>");
1150                         $remaining = $revisions->numRows();
1151                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1152
1153                         foreach ( $revisions as $row ) {
1154                                 $remaining--;
1155                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1156                         }
1157                         $revisions->free();
1158                         $wgOut->addHTML("</ul>");
1159                 } else {
1160                         $wgOut->addWikiMsg( "nohistory" );
1161                 }
1162
1163                 if( $haveFiles ) {
1164                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1165                         $wgOut->addHTML( "<ul>" );
1166                         foreach ( $files as $row ) {
1167                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1168                         }
1169                         $files->free();
1170                         $wgOut->addHTML( "</ul>" );
1171                 }
1172
1173                 if ( $this->mAllowed ) {
1174                         # Slip in the hidden controls here
1175                         $misc  = Html::hidden( 'target', $this->mTarget );
1176                         $misc .= Html::hidden( 'wpEditToken', $wgUser->editToken() );
1177                         $misc .= Xml::closeElement( 'form' );
1178                         $wgOut->addHTML( $misc );
1179                 }
1180
1181                 return true;
1182         }
1183
1184         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1185                 global $wgUser, $wgLang;
1186
1187                 $rev = Revision::newFromArchiveRow( $row,
1188                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1189                 $stxt = '';
1190                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1191                 // Build checkboxen...
1192                 if( $this->mAllowed ) {
1193                         if( $this->mInvert ) {
1194                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1195                                         $checkBox = Xml::check( "ts$ts");
1196                                 } else {
1197                                         $checkBox = Xml::check( "ts$ts", true );
1198                                 }
1199                         } else {
1200                                 $checkBox = Xml::check( "ts$ts" );
1201                         }
1202                 } else {
1203                         $checkBox = '';
1204                 }
1205                 // Build page & diff links...
1206                 if( $this->mCanView ) {
1207                         $titleObj = $this->getTitle();
1208                         # Last link
1209                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1210                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1211                                 $last = wfMsgHtml('diff');
1212                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1213                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1214                                 $last = $sk->linkKnown(
1215                                         $titleObj,
1216                                         wfMsgHtml('diff'),
1217                                         array(),
1218                                         array(
1219                                                 'target' => $this->mTargetObj->getPrefixedText(),
1220                                                 'timestamp' => $ts,
1221                                                 'diff' => 'prev'
1222                                         )
1223                                 );
1224                         } else {
1225                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1226                                 $last = wfMsgHtml('diff');
1227                         }
1228                 } else {
1229                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1230                         $last = wfMsgHtml('diff');
1231                 }
1232                 // User links
1233                 $userLink = $sk->revUserTools( $rev );
1234                 // Revision text size
1235                 if( !is_null($size = $row->ar_len) ) {
1236                         $stxt = $sk->formatRevisionSize( $size );
1237                 }
1238                 // Edit summary
1239                 $comment = $sk->revComment( $rev );
1240                 // Revision delete links
1241                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1242                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1243                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1244                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1245                         } else {
1246                                 $query = array(
1247                                         'type'   => 'archive',
1248                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1249                                         'ids'    => $ts
1250                                 );
1251                                 $revdlink = $sk->revDeleteLink( $query,
1252                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
1253                         }
1254                 } else {
1255                         $revdlink = '';
1256                 }
1257                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1258         }
1259
1260         private function formatFileRow( $row, $sk ) {
1261                 global $wgUser, $wgLang;
1262
1263                 $file = ArchivedFile::newFromRow( $row );
1264
1265                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1266                 if( $this->mAllowed && $row->fa_storage_key ) {
1267                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1268                         $key = urlencode( $row->fa_storage_key );
1269                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1270                 } else {
1271                         $checkBox = '';
1272                         $pageLink = $wgLang->timeanddate( $ts, true );
1273                 }
1274                 $userLink = $this->getFileUser( $file, $sk );
1275                 $data =
1276                         wfMsg( 'widthheight',
1277                                 $wgLang->formatNum( $row->fa_width ),
1278                                 $wgLang->formatNum( $row->fa_height ) ) .
1279                         ' (' .
1280                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1281                         ')';
1282                 $data = htmlspecialchars( $data );
1283                 $comment = $this->getFileComment( $file, $sk );
1284                 // Add show/hide deletion links if available
1285                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1286                 if( $canHide || ($file->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1287                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1288                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1289                         } else {
1290                                 $query = array(
1291                                         'type' => 'filearchive',
1292                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1293                                         'ids' => $row->fa_id
1294                                 );
1295                                 $revdlink = $sk->revDeleteLink( $query,
1296                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1297                         }
1298                 } else {
1299                         $revdlink = '';
1300                 }
1301                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1302         }
1303
1304         /**
1305          * Fetch revision text link if it's available to all users
1306          * @return string
1307          */
1308         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1309                 global $wgLang;
1310
1311                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1312
1313                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1314                         return '<span class="history-deleted">' . $time . '</span>';
1315                 } else {
1316                         $link = $sk->linkKnown(
1317                                 $titleObj,
1318                                 $time,
1319                                 array(),
1320                                 array(
1321                                         'target' => $this->mTargetObj->getPrefixedText(),
1322                                         'timestamp' => $ts
1323                                 )
1324                         );
1325                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1326                                 $link = '<span class="history-deleted">' . $link . '</span>';
1327                         return $link;
1328                 }
1329         }
1330
1331         /**
1332          * Fetch image view link if it's available to all users
1333          *
1334          * @return String: HTML fragment
1335          */
1336         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1337                 global $wgLang, $wgUser;
1338
1339                 if( !$file->userCan(File::DELETED_FILE) ) {
1340                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1341                 } else {
1342                         $link = $sk->linkKnown(
1343                                 $titleObj,
1344                                 $wgLang->timeanddate( $ts, true ),
1345                                 array(),
1346                                 array(
1347                                         'target' => $this->mTargetObj->getPrefixedText(),
1348                                         'file' => $key,
1349                                         'token' => $wgUser->editToken( $key )
1350                                 )
1351                         );
1352                         if( $file->isDeleted(File::DELETED_FILE) )
1353                                 $link = '<span class="history-deleted">' . $link . '</span>';
1354                         return $link;
1355                 }
1356         }
1357
1358         /**
1359          * Fetch file's user id if it's available to this user
1360          *
1361          * @return String: HTML fragment
1362          */
1363         function getFileUser( $file, $sk ) {
1364                 if( !$file->userCan(File::DELETED_USER) ) {
1365                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1366                 } else {
1367                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1368                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1369                         if( $file->isDeleted(File::DELETED_USER) )
1370                                 $link = '<span class="history-deleted">' . $link . '</span>';
1371                         return $link;
1372                 }
1373         }
1374
1375         /**
1376          * Fetch file upload comment if it's available to this user
1377          *
1378          * @return String: HTML fragment
1379          */
1380         function getFileComment( $file, $sk ) {
1381                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1382                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1383                 } else {
1384                         $link = $sk->commentBlock( $file->getRawDescription() );
1385                         if( $file->isDeleted(File::DELETED_COMMENT) )
1386                                 $link = '<span class="history-deleted">' . $link . '</span>';
1387                         return $link;
1388                 }
1389         }
1390
1391         function undelete() {
1392                 global $wgOut, $wgUser;
1393                 if ( wfReadOnly() ) {
1394                         $wgOut->readOnlyPage();
1395                         return;
1396                 }
1397                 if( !is_null( $this->mTargetObj ) ) {
1398                         $archive = new PageArchive( $this->mTargetObj );
1399                         $ok = $archive->undelete(
1400                                 $this->mTargetTimestamp,
1401                                 $this->mComment,
1402                                 $this->mFileVersions,
1403                                 $this->mUnsuppress );
1404
1405                         if( is_array($ok) ) {
1406                                 if ( $ok[1] ) // Undeleted file count
1407                                         wfRunHooks( 'FileUndeleteComplete', array(
1408                                                 $this->mTargetObj, $this->mFileVersions,
1409                                                 $wgUser, $this->mComment) );
1410
1411                                 $skin = $wgUser->getSkin();
1412                                 $link = $skin->linkKnown( $this->mTargetObj );
1413                                 $wgOut->addHTML( wfMsgWikiHtml( 'undeletedpage', $link ) );
1414                         } else {
1415                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1416                                 $wgOut->addHTML( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1417                         }
1418
1419                         // Show file deletion warnings and errors
1420                         $status = $archive->getFileStatus();
1421                         if( $status && !$status->isGood() ) {
1422                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1423                         }
1424                 } else {
1425                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1426                 }
1427                 return false;
1428         }
1429 }