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
  31         /**
  32          * @var Title
  33          */
  34         protected $title;
  35         var $fileStatus;
  36
  37         function __construct( $title ) {
  38                 if( is_null( $title ) ) {
  39                         throw new MWException( __METHOD__ . ' given a null title.' );
  40                 }
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * List all deleted pages recorded in the archive table. Returns result
  46          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  47          * namespace/title.
  48          *
  49          * @return ResultWrapper
  50          */
  51         public static function listAllPages() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53                 return self::listPages( $dbr, '' );
  54         }
  55
  56         /**
  57          * List deleted pages recorded in the archive table matching the
  58          * given title prefix.
  59          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  60          *
  61          * @param $prefix String: title prefix
  62          * @return ResultWrapper
  63          */
  64         public static function listPagesByPrefix( $prefix ) {
  65                 $dbr = wfGetDB( DB_SLAVE );
  66
  67                 $title = Title::newFromText( $prefix );
  68                 if( $title ) {
  69                         $ns = $title->getNamespace();
  70                         $prefix = $title->getDBkey();
  71                 } else {
  72                         // Prolly won't work too good
  73                         // @todo handle bare namespace names cleanly?
  74                         $ns = 0;
  75                 }
  76                 $conds = array(
  77                         'ar_namespace' => $ns,
  78                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  79                 );
  80                 return self::listPages( $dbr, $conds );
  81         }
  82
  83         protected static function listPages( $dbr, $condition ) {
  84                 return $dbr->resultObject(
  85                         $dbr->select(
  86                                 array( 'archive' ),
  87                                 array(
  88                                         'ar_namespace',
  89                                         'ar_title',
  90                                         'COUNT(*) AS count'
  91                                 ),
  92                                 $condition,
  93                                 __METHOD__,
  94                                 array(
  95                                         'GROUP BY' => 'ar_namespace,ar_title',
  96                                         'ORDER BY' => 'ar_namespace,ar_title',
  97                                         'LIMIT' => 100,
  98                                 )
  99                         )
 100                 );
 101         }
 102
 103         /**
 104          * List the revisions of the given page. Returns result wrapper with
 105          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 106          *
 107          * @return ResultWrapper
 108          */
 109         function listRevisions() {
 110                 $dbr = wfGetDB( DB_SLAVE );
 111                 $res = $dbr->select( 'archive',
 112                         array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment', 'ar_len', 'ar_deleted' ),
 113                         array( 'ar_namespace' => $this->title->getNamespace(),
 114                                'ar_title' => $this->title->getDBkey() ),
 115                         'PageArchive::listRevisions',
 116                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 117                 $ret = $dbr->resultObject( $res );
 118                 return $ret;
 119         }
 120
 121         /**
 122          * List the deleted file revisions for this page, if it's a file page.
 123          * Returns a result wrapper with various filearchive fields, or null
 124          * if not a file page.
 125          *
 126          * @return ResultWrapper
 127          * @todo Does this belong in Image for fuller encapsulation?
 128          */
 129         function listFiles() {
 130                 if( $this->title->getNamespace() == NS_FILE ) {
 131                         $dbr = wfGetDB( DB_SLAVE );
 132                         $res = $dbr->select( 'filearchive',
 133                                 array(
 134                                         'fa_id',
 135                                         'fa_name',
 136                                         'fa_archive_name',
 137                                         'fa_storage_key',
 138                                         'fa_storage_group',
 139                                         'fa_size',
 140                                         'fa_width',
 141                                         'fa_height',
 142                                         'fa_bits',
 143                                         'fa_metadata',
 144                                         'fa_media_type',
 145                                         'fa_major_mime',
 146                                         'fa_minor_mime',
 147                                         'fa_description',
 148                                         'fa_user',
 149                                         'fa_user_text',
 150                                         'fa_timestamp',
 151                                         'fa_deleted' ),
 152                                 array( 'fa_name' => $this->title->getDBkey() ),
 153                                 __METHOD__,
 154                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 155                         $ret = $dbr->resultObject( $res );
 156                         return $ret;
 157                 }
 158                 return null;
 159         }
 160
 161         /**
 162          * Fetch (and decompress if necessary) the stored text for the deleted
 163          * revision of the page with the given timestamp.
 164          *
 165          * @param $timestamp String
 166          * @return String
 167          * @deprecated Use getRevision() for more flexible information
 168          */
 169         function getRevisionText( $timestamp ) {
 170                 $rev = $this->getRevision( $timestamp );
 171                 return $rev ? $rev->getText() : null;
 172         }
 173
 174         /**
 175          * Return a Revision object containing data for the deleted revision.
 176          * Note that the result *may* or *may not* have a null page ID.
 177          *
 178          * @param $timestamp String
 179          * @return Revision
 180          */
 181         function getRevision( $timestamp ) {
 182                 $dbr = wfGetDB( DB_SLAVE );
 183                 $row = $dbr->selectRow( 'archive',
 184                         array(
 185                                 'ar_rev_id',
 186                                 'ar_text',
 187                                 'ar_comment',
 188                                 'ar_user',
 189                                 'ar_user_text',
 190                                 'ar_timestamp',
 191                                 'ar_minor_edit',
 192                                 'ar_flags',
 193                                 'ar_text_id',
 194                                 'ar_deleted',
 195                                 'ar_len' ),
 196                         array( 'ar_namespace' => $this->title->getNamespace(),
 197                                'ar_title' => $this->title->getDBkey(),
 198                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 199                         __METHOD__ );
 200                 if( $row ) {
 201                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 202                 } else {
 203                         return null;
 204                 }
 205         }
 206
 207         /**
 208          * Return the most-previous revision, either live or deleted, against
 209          * the deleted revision given by timestamp.
 210          *
 211          * May produce unexpected results in case of history merges or other
 212          * unusual time issues.
 213          *
 214          * @param $timestamp String
 215          * @return Revision or null
 216          */
 217         function getPreviousRevision( $timestamp ) {
 218                 $dbr = wfGetDB( DB_SLAVE );
 219
 220                 // Check the previous deleted revision...
 221                 $row = $dbr->selectRow( 'archive',
 222                         'ar_timestamp',
 223                         array( 'ar_namespace' => $this->title->getNamespace(),
 224                                'ar_title' => $this->title->getDBkey(),
 225                                'ar_timestamp < ' .
 226                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 227                         __METHOD__,
 228                         array(
 229                                 'ORDER BY' => 'ar_timestamp DESC',
 230                                 'LIMIT' => 1 ) );
 231                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 232
 233                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 234                         array( 'rev_id', 'rev_timestamp' ),
 235                         array(
 236                                 'page_namespace' => $this->title->getNamespace(),
 237                                 'page_title' => $this->title->getDBkey(),
 238                                 'page_id = rev_page',
 239                                 'rev_timestamp < ' .
 240                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 241                         __METHOD__,
 242                         array(
 243                                 'ORDER BY' => 'rev_timestamp DESC',
 244                                 'LIMIT' => 1 ) );
 245                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 246                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 247
 248                 if( $prevLive && $prevLive > $prevDeleted ) {
 249                         // Most prior revision was live
 250                         return Revision::newFromId( $prevLiveId );
 251                 } elseif( $prevDeleted ) {
 252                         // Most prior revision was deleted
 253                         return $this->getRevision( $prevDeleted );
 254                 } else {
 255                         // No prior revision on this page.
 256                         return null;
 257                 }
 258         }
 259
 260         /**
 261          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 262          *
 263          * @param $row Object: database row
 264          * @return Revision
 265          */
 266         function getTextFromRow( $row ) {
 267                 if( is_null( $row->ar_text_id ) ) {
 268                         // An old row from MediaWiki 1.4 or previous.
 269                         // Text is embedded in this row in classic compression format.
 270                         return Revision::getRevisionText( $row, "ar_" );
 271                 } else {
 272                         // New-style: keyed to the text storage backend.
 273                         $dbr = wfGetDB( DB_SLAVE );
 274                         $text = $dbr->selectRow( 'text',
 275                                 array( 'old_text', 'old_flags' ),
 276                                 array( 'old_id' => $row->ar_text_id ),
 277                                 __METHOD__ );
 278                         return Revision::getRevisionText( $text );
 279                 }
 280         }
 281
 282
 283         /**
 284          * Fetch (and decompress if necessary) the stored text of the most
 285          * recently edited deleted revision of the page.
 286          *
 287          * If there are no archived revisions for the page, returns NULL.
 288          *
 289          * @return String
 290          */
 291         function getLastRevisionText() {
 292                 $dbr = wfGetDB( DB_SLAVE );
 293                 $row = $dbr->selectRow( 'archive',
 294                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 295                         array( 'ar_namespace' => $this->title->getNamespace(),
 296                                'ar_title' => $this->title->getDBkey() ),
 297                         __METHOD__,
 298                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 299                 if( $row ) {
 300                         return $this->getTextFromRow( $row );
 301                 } else {
 302                         return null;
 303                 }
 304         }
 305
 306         /**
 307          * Quick check if any archived revisions are present for the page.
 308          *
 309          * @return Boolean
 310          */
 311         function isDeleted() {
 312                 $dbr = wfGetDB( DB_SLAVE );
 313                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 314                         array( 'ar_namespace' => $this->title->getNamespace(),
 315                                'ar_title' => $this->title->getDBkey() ) );
 316                 return ($n > 0);
 317         }
 318
 319         /**
 320          * Restore the given (or all) text and file revisions for the page.
 321          * Once restored, the items will be removed from the archive tables.
 322          * The deletion log will be updated with an undeletion notice.
 323          *
 324          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 325          * @param $comment String
 326          * @param $fileVersions Array
 327          * @param $unsuppress Boolean
 328          *
 329          * @return array(number of file revisions restored, number of image revisions restored, log message)
 330          * on success, false on failure
 331          */
 332         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 333                 // If both the set of text revisions and file revisions are empty,
 334                 // restore everything. Otherwise, just restore the requested items.
 335                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 336
 337                 $restoreText = $restoreAll || !empty( $timestamps );
 338                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 339
 340                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 341                         $img = wfLocalFile( $this->title );
 342                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 343                         if ( !$this->fileStatus->isOk() ) {
 344                                 return false;
 345                         }
 346                         $filesRestored = $this->fileStatus->successCount;
 347                 } else {
 348                         $filesRestored = 0;
 349                 }
 350
 351                 if( $restoreText ) {
 352                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 353                         if($textRestored === false) // It must be one of UNDELETE_*
 354                                 return false;
 355                 } else {
 356                         $textRestored = 0;
 357                 }
 358
 359                 // Touch the log!
 360                 global $wgContLang;
 361                 $log = new LogPage( 'delete' );
 362
 363                 if( $textRestored && $filesRestored ) {
 364                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 365                                 $wgContLang->formatNum( $textRestored ),
 366                                 $wgContLang->formatNum( $filesRestored ) );
 367                 } elseif( $textRestored ) {
 368                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 369                                 $wgContLang->formatNum( $textRestored ) );
 370                 } elseif( $filesRestored ) {
 371                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 372                                 $wgContLang->formatNum( $filesRestored ) );
 373                 } else {
 374                         wfDebug( "Undelete: nothing undeleted...\n" );
 375                         return false;
 376                 }
 377
 378                 if( trim( $comment ) != '' )
 379                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 380                 $log->addEntry( 'restore', $this->title, $reason );
 381
 382                 return array($textRestored, $filesRestored, $reason);
 383         }
 384
 385         /**
 386          * This is the meaty bit -- restores archived revisions of the given page
 387          * to the cur/old tables. If the page currently exists, all revisions will
 388          * be stuffed into old, otherwise the most recent will go into cur.
 389          *
 390          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 391          * @param $comment String
 392          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 393          *
 394          * @return Mixed: number of revisions restored or false on failure
 395          */
 396         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 397                 if ( wfReadOnly() )
 398                         return false;
 399                 $restoreAll = empty( $timestamps );
 400
 401                 $dbw = wfGetDB( DB_MASTER );
 402
 403                 # Does this page already exist? We'll have to update it...
 404                 $article = new Article( $this->title );
 405                 $options = 'FOR UPDATE'; // lock page
 406                 $page = $dbw->selectRow( 'page',
 407                         array( 'page_id', 'page_latest' ),
 408                         array( 'page_namespace' => $this->title->getNamespace(),
 409                                'page_title'     => $this->title->getDBkey() ),
 410                         __METHOD__,
 411                         $options
 412                 );
 413                 if( $page ) {
 414                         $makepage = false;
 415                         # Page already exists. Import the history, and if necessary
 416                         # we'll update the latest revision field in the record.
 417                         $newid             = 0;
 418                         $pageId            = $page->page_id;
 419                         $previousRevId    = $page->page_latest;
 420                         # Get the time span of this page
 421                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 422                                 array( 'rev_id' => $previousRevId ),
 423                                 __METHOD__ );
 424                         if( $previousTimestamp === false ) {
 425                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 426                                 return 0;
 427                         }
 428                 } else {
 429                         # Have to create a new article...
 430                         $makepage = true;
 431                         $previousRevId = 0;
 432                         $previousTimestamp = 0;
 433                 }
 434
 435                 if( $restoreAll ) {
 436                         $oldones = '1 = 1'; # All revisions...
 437                 } else {
 438                         $oldts = implode( ',',
 439                                 array_map( array( &$dbw, 'addQuotes' ),
 440                                         array_map( array( &$dbw, 'timestamp' ),
 441                                                 $timestamps ) ) );
 442
 443                         $oldones = "ar_timestamp IN ( {$oldts} )";
 444                 }
 445
 446                 /**
 447                  * Select each archived revision...
 448                  */
 449                 $result = $dbw->select( 'archive',
 450                         /* fields */ array(
 451                                 'ar_rev_id',
 452                                 'ar_text',
 453                                 'ar_comment',
 454                                 'ar_user',
 455                                 'ar_user_text',
 456                                 'ar_timestamp',
 457                                 'ar_minor_edit',
 458                                 'ar_flags',
 459                                 'ar_text_id',
 460                                 'ar_deleted',
 461                                 'ar_page_id',
 462                                 'ar_len' ),
 463                         /* WHERE */ array(
 464                                 'ar_namespace' => $this->title->getNamespace(),
 465                                 'ar_title'     => $this->title->getDBkey(),
 466                                 $oldones ),
 467                         __METHOD__,
 468                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 469                 );
 470                 $ret = $dbw->resultObject( $result );
 471                 $rev_count = $dbw->numRows( $result );
 472                 if( !$rev_count ) {
 473                         wfDebug( __METHOD__.": no revisions to restore\n" );
 474                         return false; // ???
 475                 }
 476
 477                 $ret->seek( $rev_count - 1 ); // move to last
 478                 $row = $ret->fetchObject(); // get newest archived rev
 479                 $ret->seek( 0 ); // move back
 480
 481                 if( $makepage ) {
 482                         // Check the state of the newest to-be version...
 483                         if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 484                                 return false; // we can't leave the current revision like this!
 485                         }
 486                         // Safe to insert now...
 487                         $newid  = $article->insertOn( $dbw );
 488                         $pageId = $newid;
 489                 } else {
 490                         // Check if a deleted revision will become the current revision...
 491                         if( $row->ar_timestamp > $previousTimestamp ) {
 492                                 // Check the state of the newest to-be version...
 493                                 if( !$unsuppress && ($row->ar_deleted & Revision::DELETED_TEXT) ) {
 494                                         return false; // we can't leave the current revision like this!
 495                                 }
 496                         }
 497                 }
 498
 499                 $revision = null;
 500                 $restored = 0;
 501
 502                 foreach ( $ret as $row ) {
 503                         // Check for key dupes due to shitty archive integrity.
 504                         if( $row->ar_rev_id ) {
 505                                 $exists = $dbw->selectField( 'revision', '1', array('rev_id' => $row->ar_rev_id), __METHOD__ );
 506                                 if( $exists ) continue; // don't throw DB errors
 507                         }
 508                         // Insert one revision at a time...maintaining deletion status
 509                         // unless we are specifically removing all restrictions...
 510                         $revision = Revision::newFromArchiveRow( $row,
 511                                 array(
 512                                         'page' => $pageId,
 513                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 514                                 ) );
 515
 516                         $revision->insertOn( $dbw );
 517                         $restored++;
 518
 519                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 520                 }
 521                 # Now that it's safely stored, take it out of the archive
 522                 $dbw->delete( 'archive',
 523                         /* WHERE */ array(
 524                                 'ar_namespace' => $this->title->getNamespace(),
 525                                 'ar_title' => $this->title->getDBkey(),
 526                                 $oldones ),
 527                         __METHOD__ );
 528
 529                 // Was anything restored at all?
 530                 if( $restored == 0 )
 531                         return 0;
 532
 533                 if( $revision ) {
 534                         // Attach the latest revision to the page...
 535                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 536                         if( $newid || $wasnew ) {
 537                                 // Update site stats, link tables, etc
 538                                 $article->createUpdates( $revision );
 539                         }
 540
 541                         if( $newid ) {
 542                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true, $comment ) );
 543                                 Article::onArticleCreate( $this->title );
 544                         } else {
 545                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false, $comment ) );
 546                                 Article::onArticleEdit( $this->title );
 547                         }
 548
 549                         if( $this->title->getNamespace() == NS_FILE ) {
 550                                 $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 551                                 $update->doUpdate();
 552                         }
 553                 } else {
 554                         // Revision couldn't be created. This is very weird
 555                         wfDebug( "Undelete: unknown error...\n" );
 556                         return false;
 557                 }
 558
 559                 return $restored;
 560         }
 561
 562         /**
 563          * @return Status
 564          */
 565         function getFileStatus() { return $this->fileStatus; }
 566 }
 567
 568 /**
 569  * Special page allowing users with the appropriate permissions to view
 570  * and restore deleted content.
 571  *
 572  * @ingroup SpecialPage
 573  */
 574 class SpecialUndelete extends SpecialPage {
 575         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj;
 576         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken, $mRequest;
 577
 578         function __construct( $request = null ) {
 579                 parent::__construct( 'Undelete', 'deletedhistory' );
 580
 581                 if ( $request === null ) {
 582                         global $wgRequest;
 583                         $this->mRequest = $wgRequest;
 584                 } else {
 585                         $this->mRequest = $request;
 586                 }
 587         }
 588
 589         function loadRequest() {
 590                 global $wgUser;
 591                 $this->mAction = $this->mRequest->getVal( 'action' );
 592                 $this->mTarget = $this->mRequest->getVal( 'target' );
 593                 $this->mSearchPrefix = $this->mRequest->getText( 'prefix' );
 594                 $time = $this->mRequest->getVal( 'timestamp' );
 595                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 596                 $this->mFile = $this->mRequest->getVal( 'file' );
 597
 598                 $posted = $this->mRequest->wasPosted() &&
 599                         $wgUser->matchEditToken( $this->mRequest->getVal( 'wpEditToken' ) );
 600                 $this->mRestore = $this->mRequest->getCheck( 'restore' ) && $posted;
 601                 $this->mInvert = $this->mRequest->getCheck( 'invert' ) && $posted;
 602                 $this->mPreview = $this->mRequest->getCheck( 'preview' ) && $posted;
 603                 $this->mDiff = $this->mRequest->getCheck( 'diff' );
 604                 $this->mComment = $this->mRequest->getText( 'wpComment' );
 605                 $this->mUnsuppress = $this->mRequest->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 606                 $this->mToken = $this->mRequest->getVal( 'token' );
 607
 608                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 609                         $this->mAllowed = true; // user can restore
 610                         $this->mCanView = true; // user can view content
 611                 } elseif ( $wgUser->isAllowed( 'deletedtext' ) ) {
 612                         $this->mAllowed = false; // user cannot restore
 613                         $this->mCanView = true; // user can view content
 614                 }  else { // user can only view the list of revisions
 615                         $this->mAllowed = false;
 616                         $this->mCanView = false;
 617                         $this->mTimestamp = '';
 618                         $this->mRestore = false;
 619                 }
 620
 621                 if( $this->mRestore || $this->mInvert ) {
 622                         $timestamps = array();
 623                         $this->mFileVersions = array();
 624                         foreach( $_REQUEST as $key => $val ) {
 625                                 $matches = array();
 626                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 627                                         array_push( $timestamps, $matches[1] );
 628                                 }
 629
 630                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 631                                         $this->mFileVersions[] = intval( $matches[1] );
 632                                 }
 633                         }
 634                         rsort( $timestamps );
 635                         $this->mTargetTimestamp = $timestamps;
 636                 }
 637         }
 638
 639         function execute( $par ) {
 640                 global $wgOut, $wgUser;
 641
 642                 $this->setHeaders();
 643                 if ( !$this->userCanExecute( $wgUser ) ) {
 644                         $this->displayRestrictionError();
 645                         return;
 646                 }
 647                 $this->outputHeader();
 648
 649                 $this->loadRequest();
 650
 651                 if ( $this->mAllowed ) {
 652                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 653                 } else {
 654                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 655                 }
 656
 657                 if( $par != '' ) {
 658                         $this->mTarget = $par;
 659                 }
 660                 if ( $this->mTarget !== '' ) {
 661                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 662                         $wgUser->getSkin()->setRelevantTitle( $this->mTargetObj );
 663                 } else {
 664                         $this->mTargetObj = null;
 665                 }
 666
 667                 if( is_null( $this->mTargetObj ) ) {
 668                 # Not all users can just browse every deleted page from the list
 669                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 670                                 $this->showSearchForm();
 671
 672                                 # List undeletable articles
 673                                 if( $this->mSearchPrefix ) {
 674                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 675                                         $this->showList( $result );
 676                                 }
 677                         } else {
 678                                 $wgOut->addWikiMsg( 'undelete-header' );
 679                         }
 680                         return;
 681                 }
 682                 if( $this->mTimestamp !== '' ) {
 683                         return $this->showRevision( $this->mTimestamp );
 684                 }
 685                 if( $this->mFile !== null ) {
 686                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 687                         // Check if user is allowed to see this file
 688                         if ( !$file->exists() ) {
 689                                 $wgOut->addWikiMsg( 'filedelete-nofile', $this->mFile );
 690                                 return;
 691                         } else if( !$file->userCan( File::DELETED_FILE ) ) {
 692                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 693                                         $wgOut->permissionRequired( 'suppressrevision' );
 694                                 } else {
 695                                         $wgOut->permissionRequired( 'deletedtext' );
 696                                 }
 697                                 return false;
 698                         } elseif ( !$wgUser->matchEditToken( $this->mToken, $this->mFile ) ) {
 699                                 $this->showFileConfirmationForm( $this->mFile );
 700                                 return false;
 701                         } else {
 702                                 return $this->showFile( $this->mFile );
 703                         }
 704                 }
 705                 if( $this->mRestore && $this->mAction == "submit" ) {
 706                         global $wgUploadMaintenance;
 707                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 708                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 709                                 return;
 710                         }
 711                         return $this->undelete();
 712                 }
 713                 if( $this->mInvert && $this->mAction == "submit" ) {
 714                         return $this->showHistory( );
 715                 }
 716                 return $this->showHistory();
 717         }
 718
 719         function showSearchForm() {
 720                 global $wgOut, $wgScript;
 721                 $wgOut->addWikiMsg( 'undelete-header' );
 722
 723                 $wgOut->addHTML(
 724                         Xml::openElement( 'form', array(
 725                                 'method' => 'get',
 726                                 'action' => $wgScript ) ) .
 727                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 728                         Html::hidden( 'title',
 729                                 $this->getTitle()->getPrefixedDbKey() ) .
 730                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 731                                 'prefix', 'prefix', 20,
 732                                 $this->mSearchPrefix ) . ' ' .
 733                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 734                         Xml::closeElement( 'fieldset' ) .
 735                         Xml::closeElement( 'form' )
 736                 );
 737         }
 738
 739         // Generic list of deleted pages
 740         private function showList( $result ) {
 741                 global $wgLang, $wgUser, $wgOut;
 742
 743                 if( $result->numRows() == 0 ) {
 744                         $wgOut->addWikiMsg( 'undelete-no-results' );
 745                         return;
 746                 }
 747
 748                 $wgOut->addWikiMsg( 'undeletepagetext', $wgLang->formatNum( $result->numRows() ) );
 749
 750                 $sk = $wgUser->getSkin();
 751                 $undelete = $this->getTitle();
 752                 $wgOut->addHTML( "<ul>\n" );
 753                 foreach ( $result as $row ) {
 754                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 755                         $link = $sk->linkKnown(
 756                                 $undelete,
 757                                 htmlspecialchars( $title->getPrefixedText() ),
 758                                 array(),
 759                                 array( 'target' => $title->getPrefixedText() )
 760                         );
 761                         $revs = wfMsgExt( 'undeleterevisions',
 762                                 array( 'parseinline' ),
 763                                 $wgLang->formatNum( $row->count ) );
 764                         $wgOut->addHTML( "<li>{$link} ({$revs})</li>\n" );
 765                 }
 766                 $result->free();
 767                 $wgOut->addHTML( "</ul>\n" );
 768
 769                 return true;
 770         }
 771
 772         private function showRevision( $timestamp ) {
 773                 global $wgLang, $wgUser, $wgOut;
 774
 775                 $skin = $wgUser->getSkin();
 776
 777                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 778
 779                 $archive = new PageArchive( $this->mTargetObj );
 780                 $rev = $archive->getRevision( $timestamp );
 781
 782                 if( !$rev ) {
 783                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 784                         return;
 785                 }
 786
 787                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 788                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 789                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 790                                 return;
 791                         } else {
 792                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 793                                 $wgOut->addHTML( '<br />' );
 794                                 // and we are allowed to see...
 795                         }
 796                 }
 797
 798                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 799
 800                 $link = $skin->linkKnown(
 801                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 802                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 803                 );
 804
 805                 if( $this->mDiff ) {
 806                         $previousRev = $archive->getPreviousRevision( $timestamp );
 807                         if( $previousRev ) {
 808                                 $this->showDiff( $previousRev, $rev );
 809                                 if( $wgUser->getOption( 'diffonly' ) ) {
 810                                         return;
 811                                 } else {
 812                                         $wgOut->addHTML( '<hr />' );
 813                                 }
 814                         } else {
 815                                 $wgOut->addWikiMsg( 'undelete-nodiff' );
 816                         }
 817                 }
 818
 819                 // date and time are separate parameters to facilitate localisation.
 820                 // $time is kept for backward compat reasons.
 821                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 822                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 823                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 824                 $user = $skin->revUserTools( $rev );
 825
 826                 if( $this->mPreview ) {
 827                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 828                 } else {
 829                         $openDiv = '<div id="mw-undelete-revision">';
 830                 }
 831                 $wgOut->addHTML( $openDiv );
 832
 833                 // Revision delete links
 834                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 835                 if ( !$this->mDiff && ( $canHide || ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) ) {
 836                         if( !$rev->userCan(Revision::DELETED_RESTRICTED ) ) {
 837                                 $wgOut->addHTML( $skin->revDeleteLinkDisabled( $canHide ) ); // revision was hidden from sysops
 838                         } else {
 839                                 $query = array(
 840                                         'type'   => 'archive',
 841                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
 842                                         'ids'    => $rev->getTimestamp()
 843                                 );
 844                                 $wgOut->addHTML( $skin->revDeleteLink( $query,
 845                                         $rev->isDeleted( File::DELETED_RESTRICTED ), $canHide ) );
 846                         }
 847                 }
 848
 849                 $wgOut->addWikiMsgArray( 'undelete-revision', array( $link, $time, $user, $d, $t ), array( 'replaceafter' ) );
 850                 $wgOut->addHTML( '</div>' );
 851                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 852
 853                 if( $this->mPreview ) {
 854                         //Hide [edit]s
 855                         $popts = $wgOut->parserOptions();
 856                         $popts->setEditSection( false );
 857                         $wgOut->parserOptions( $popts );
 858                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 859                 }
 860
 861                 $wgOut->addHTML(
 862                         Xml::element( 'textarea', array(
 863                                         'readonly' => 'readonly',
 864                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 865                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 866                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 867                         Xml::openElement( 'div' ) .
 868                         Xml::openElement( 'form', array(
 869                                 'method' => 'post',
 870                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 871                         Xml::element( 'input', array(
 872                                 'type' => 'hidden',
 873                                 'name' => 'target',
 874                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 875                         Xml::element( 'input', array(
 876                                 'type' => 'hidden',
 877                                 'name' => 'timestamp',
 878                                 'value' => $timestamp ) ) .
 879                         Xml::element( 'input', array(
 880                                 'type' => 'hidden',
 881                                 'name' => 'wpEditToken',
 882                                 'value' => $wgUser->editToken() ) ) .
 883                         Xml::element( 'input', array(
 884                                 'type' => 'submit',
 885                                 'name' => 'preview',
 886                                 'value' => wfMsg( 'showpreview' ) ) ) .
 887                         Xml::element( 'input', array(
 888                                 'name' => 'diff',
 889                                 'type' => 'submit',
 890                                 'value' => wfMsg( 'showdiff' ) ) ) .
 891                         Xml::closeElement( 'form' ) .
 892                         Xml::closeElement( 'div' ) );
 893         }
 894
 895         /**
 896          * Build a diff display between this and the previous either deleted
 897          * or non-deleted edit.
 898          *
 899          * @param $previousRev Revision
 900          * @param $currentRev Revision
 901          * @return String: HTML
 902          */
 903         function showDiff( $previousRev, $currentRev ) {
 904                 global $wgOut;
 905
 906                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 907                 $diffEngine->showDiffStyle();
 908                 $wgOut->addHTML(
 909                         "<div>" .
 910                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 911                         "<col class='diff-marker' />" .
 912                         "<col class='diff-content' />" .
 913                         "<col class='diff-marker' />" .
 914                         "<col class='diff-content' />" .
 915                         "<tr>" .
 916                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 917                                 $this->diffHeader( $previousRev, 'o' ) .
 918                                 "</td>\n" .
 919                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 920                                 $this->diffHeader( $currentRev, 'n' ) .
 921                                 "</td>\n" .
 922                         "</tr>" .
 923                         $diffEngine->generateDiffBody(
 924                                 $previousRev->getText(), $currentRev->getText() ) .
 925                         "</table>" .
 926                         "</div>\n"
 927                 );
 928         }
 929
 930         /**
 931          * @param $rev Revision
 932          * @param  $prefix
 933          * @return string
 934          */
 935         private function diffHeader( $rev, $prefix ) {
 936                 global $wgUser, $wgLang;
 937                 $sk = $wgUser->getSkin();
 938                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 939                 if( $isDeleted ) {
 940                         /// @todo Fixme: $rev->getTitle() is null for deleted revs...?
 941                         $targetPage = $this->getTitle();
 942                         $targetQuery = array(
 943                                 'target' => $this->mTargetObj->getPrefixedText(),
 944                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 945                         );
 946                 } else {
 947                         /// @todo Fixme getId() may return non-zero for deleted revs...
 948                         $targetPage = $rev->getTitle();
 949                         $targetQuery = array( 'oldid' => $rev->getId() );
 950                 }
 951                 // Add show/hide deletion links if available
 952                 $canHide = $wgUser->isAllowed( 'deleterevision' );
 953                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
 954                         $del = ' ';
 955                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 956                                 $del .= $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
 957                         } else {
 958                                 $query = array(
 959                                         'type'   => 'archive',
 960                                         'target' => $this->mTargetObj->getPrefixedDbkey(),
 961                                         'ids'    => $rev->getTimestamp()
 962                                 );
 963                                 $del .= $sk->revDeleteLink( $query,
 964                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
 965                         }
 966                 } else {
 967                         $del = '';
 968                 }
 969                 return
 970                         '<div id="mw-diff-'.$prefix.'title1"><strong>' .
 971                                 $sk->link(
 972                                         $targetPage,
 973                                         wfMsgHtml(
 974                                                 'revisionasof',
 975                                                 htmlspecialchars( $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 976                                                 htmlspecialchars( $wgLang->date( $rev->getTimestamp(), true ) ),
 977                                                 htmlspecialchars( $wgLang->time( $rev->getTimestamp(), true ) )
 978                                         ),
 979                                         array(),
 980                                         $targetQuery
 981                                 ) .
 982                         '</strong></div>' .
 983                         '<div id="mw-diff-'.$prefix.'title2">' .
 984                                 $sk->revUserTools( $rev ) . '<br />' .
 985                         '</div>' .
 986                         '<div id="mw-diff-'.$prefix.'title3">' .
 987                                 $sk->revComment( $rev ) . $del . '<br />' .
 988                         '</div>';
 989         }
 990
 991         /**
 992          * Show a form confirming whether a tokenless user really wants to see a file
 993          */
 994         private function showFileConfirmationForm( $key ) {
 995                 global $wgOut, $wgUser, $wgLang;
 996                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 997                 $wgOut->addWikiMsg( 'undelete-show-file-confirm',
 998                         $this->mTargetObj->getText(),
 999                         $wgLang->date( $file->getTimestamp() ),
1000                         $wgLang->time( $file->getTimestamp() ) );
1001                 $wgOut->addHTML(
1002                         Xml::openElement( 'form', array(
1003                                 'method' => 'POST',
1004                                 'action' => $this->getTitle()->getLocalUrl(
1005                                         'target=' . urlencode( $this->mTarget ) .
1006                                         '&file=' . urlencode( $key ) .
1007                                         '&token=' . urlencode( $wgUser->editToken( $key ) ) )
1008                                 )
1009                         ) .
1010                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
1011                         '</form>'
1012                 );
1013         }
1014
1015         /**
1016          * Show a deleted file version requested by the visitor.
1017          */
1018         private function showFile( $key ) {
1019                 global $wgOut, $wgRequest;
1020                 $wgOut->disable();
1021
1022                 # We mustn't allow the output to be Squid cached, otherwise
1023                 # if an admin previews a deleted image, and it's cached, then
1024                 # a user without appropriate permissions can toddle off and
1025                 # nab the image, and Squid will serve it
1026                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1027                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1028                 $wgRequest->response()->header( 'Pragma: no-cache' );
1029
1030                 global $IP;
1031                 require_once( "$IP/includes/StreamFile.php" );
1032                 $repo = RepoGroup::singleton()->getLocalRepo();
1033                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1034                 wfStreamFile( $path );
1035         }
1036
1037         private function showHistory( ) {
1038                 global $wgUser, $wgOut;
1039
1040                 $sk = $wgUser->getSkin();
1041                 if( $this->mAllowed ) {
1042                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
1043                 } else {
1044                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
1045                 }
1046
1047                 $wgOut->wrapWikiMsg(  "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n", array ( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() ) );
1048
1049                 $archive = new PageArchive( $this->mTargetObj );
1050                 /*
1051                 $text = $archive->getLastRevisionText();
1052                 if( is_null( $text ) ) {
1053                         $wgOut->addWikiMsg( "nohistory" );
1054                         return;
1055                 }
1056                 */
1057                 $wgOut->addHTML( '<div class="mw-undelete-history">' );
1058                 if ( $this->mAllowed ) {
1059                         $wgOut->addWikiMsg( "undeletehistory" );
1060                         $wgOut->addWikiMsg( "undeleterevdel" );
1061                 } else {
1062                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
1063                 }
1064                 $wgOut->addHTML( '</div>' );
1065
1066                 # List all stored revisions
1067                 $revisions = $archive->listRevisions();
1068                 $files = $archive->listFiles();
1069
1070                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1071                 $haveFiles = $files && $files->numRows() > 0;
1072
1073                 # Batch existence check on user and talk pages
1074                 if( $haveRevisions ) {
1075                         $batch = new LinkBatch();
1076                         foreach ( $revisions as $row ) {
1077                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1078                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1079                         }
1080                         $batch->execute();
1081                         $revisions->seek( 0 );
1082                 }
1083                 if( $haveFiles ) {
1084                         $batch = new LinkBatch();
1085                         foreach ( $files as $row ) {
1086                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1087                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1088                         }
1089                         $batch->execute();
1090                         $files->seek( 0 );
1091                 }
1092
1093                 if ( $this->mAllowed ) {
1094                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1095                         # Start the form here
1096                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1097                         $wgOut->addHTML( $top );
1098                 }
1099
1100                 # Show relevant lines from the deletion log:
1101                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1102                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
1103                 # Show relevant lines from the suppression log:
1104                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
1105                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1106                         LogEventsList::showLogExtract( $wgOut, 'suppress', $this->mTargetObj->getPrefixedText() );
1107                 }
1108
1109                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1110                         # Format the user-visible controls (comment field, submission button)
1111                         # in a nice little table
1112                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
1113                                 $unsuppressBox =
1114                                         "<tr>
1115                                                 <td>&#160;</td>
1116                                                 <td class='mw-input'>" .
1117                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
1118                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1119                                                 "</td>
1120                                         </tr>";
1121                         } else {
1122                                 $unsuppressBox = "";
1123                         }
1124                         $table =
1125                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1126                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1127                                         "<tr>
1128                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1129                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1130                                                 "</td>
1131                                         </tr>
1132                                         <tr>
1133                                                 <td class='mw-label'>" .
1134                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1135                                                 "</td>
1136                                                 <td class='mw-input'>" .
1137                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1138                                                 "</td>
1139                                         </tr>
1140                                         <tr>
1141                                                 <td>&#160;</td>
1142                                                 <td class='mw-submit'>" .
1143                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1144                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) . ' ' .
1145                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1146                                                 "</td>
1147                                         </tr>" .
1148                                         $unsuppressBox .
1149                                 Xml::closeElement( 'table' ) .
1150                                 Xml::closeElement( 'fieldset' );
1151
1152                         $wgOut->addHTML( $table );
1153                 }
1154
1155                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1156
1157                 if( $haveRevisions ) {
1158                         # The page's stored (deleted) history:
1159                         $wgOut->addHTML("<ul>");
1160                         $remaining = $revisions->numRows();
1161                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1162
1163                         foreach ( $revisions as $row ) {
1164                                 $remaining--;
1165                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1166                         }
1167                         $revisions->free();
1168                         $wgOut->addHTML("</ul>");
1169                 } else {
1170                         $wgOut->addWikiMsg( "nohistory" );
1171                 }
1172
1173                 if( $haveFiles ) {
1174                         $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1175                         $wgOut->addHTML( "<ul>" );
1176                         foreach ( $files as $row ) {
1177                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1178                         }
1179                         $files->free();
1180                         $wgOut->addHTML( "</ul>" );
1181                 }
1182
1183                 if ( $this->mAllowed ) {
1184                         # Slip in the hidden controls here
1185                         $misc  = Html::hidden( 'target', $this->mTarget );
1186                         $misc .= Html::hidden( 'wpEditToken', $wgUser->editToken() );
1187                         $misc .= Xml::closeElement( 'form' );
1188                         $wgOut->addHTML( $misc );
1189                 }
1190
1191                 return true;
1192         }
1193
1194         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1195                 global $wgUser, $wgLang;
1196
1197                 $rev = Revision::newFromArchiveRow( $row,
1198                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1199                 $stxt = '';
1200                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1201                 // Build checkboxen...
1202                 if( $this->mAllowed ) {
1203                         if( $this->mInvert ) {
1204                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1205                                         $checkBox = Xml::check( "ts$ts");
1206                                 } else {
1207                                         $checkBox = Xml::check( "ts$ts", true );
1208                                 }
1209                         } else {
1210                                 $checkBox = Xml::check( "ts$ts" );
1211                         }
1212                 } else {
1213                         $checkBox = '';
1214                 }
1215                 // Build page & diff links...
1216                 if( $this->mCanView ) {
1217                         $titleObj = $this->getTitle();
1218                         # Last link
1219                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1220                                 $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1221                                 $last = wfMsgHtml('diff');
1222                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1223                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1224                                 $last = $sk->linkKnown(
1225                                         $titleObj,
1226                                         wfMsgHtml('diff'),
1227                                         array(),
1228                                         array(
1229                                                 'target' => $this->mTargetObj->getPrefixedText(),
1230                                                 'timestamp' => $ts,
1231                                                 'diff' => 'prev'
1232                                         )
1233                                 );
1234                         } else {
1235                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1236                                 $last = wfMsgHtml('diff');
1237                         }
1238                 } else {
1239                         $pageLink = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1240                         $last = wfMsgHtml('diff');
1241                 }
1242                 // User links
1243                 $userLink = $sk->revUserTools( $rev );
1244                 // Revision text size
1245                 if( !is_null($size = $row->ar_len) ) {
1246                         $stxt = $sk->formatRevisionSize( $size );
1247                 }
1248                 // Edit summary
1249                 $comment = $sk->revComment( $rev );
1250                 // Revision delete links
1251                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1252                 if( $canHide || ($rev->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1253                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1254                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1255                         } else {
1256                                 $query = array(
1257                                         'type'   => 'archive',
1258                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1259                                         'ids'    => $ts
1260                                 );
1261                                 $revdlink = $sk->revDeleteLink( $query,
1262                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
1263                         }
1264                 } else {
1265                         $revdlink = '';
1266                 }
1267                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1268         }
1269
1270         private function formatFileRow( $row, $sk ) {
1271                 global $wgUser, $wgLang;
1272
1273                 $file = ArchivedFile::newFromRow( $row );
1274
1275                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1276                 if( $this->mAllowed && $row->fa_storage_key ) {
1277                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1278                         $key = urlencode( $row->fa_storage_key );
1279                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key, $sk );
1280                 } else {
1281                         $checkBox = '';
1282                         $pageLink = $wgLang->timeanddate( $ts, true );
1283                 }
1284                 $userLink = $this->getFileUser( $file, $sk );
1285                 $data =
1286                         wfMsg( 'widthheight',
1287                                 $wgLang->formatNum( $row->fa_width ),
1288                                 $wgLang->formatNum( $row->fa_height ) ) .
1289                         ' (' .
1290                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1291                         ')';
1292                 $data = htmlspecialchars( $data );
1293                 $comment = $this->getFileComment( $file, $sk );
1294                 // Add show/hide deletion links if available
1295                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1296                 if( $canHide || ($file->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
1297                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1298                                 $revdlink = $sk->revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1299                         } else {
1300                                 $query = array(
1301                                         'type' => 'filearchive',
1302                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1303                                         'ids' => $row->fa_id
1304                                 );
1305                                 $revdlink = $sk->revDeleteLink( $query,
1306                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1307                         }
1308                 } else {
1309                         $revdlink = '';
1310                 }
1311                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1312         }
1313
1314         /**
1315          * Fetch revision text link if it's available to all users
1316          *
1317          * @param $rev Revision
1318          * @param $sk Skin
1319          * @return string
1320          */
1321         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1322                 global $wgLang;
1323
1324                 $time = htmlspecialchars( $wgLang->timeanddate( $ts, true ) );
1325
1326                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1327                         return '<span class="history-deleted">' . $time . '</span>';
1328                 } else {
1329                         $link = $sk->linkKnown(
1330                                 $titleObj,
1331                                 $time,
1332                                 array(),
1333                                 array(
1334                                         'target' => $this->mTargetObj->getPrefixedText(),
1335                                         'timestamp' => $ts
1336                                 )
1337                         );
1338                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1339                                 $link = '<span class="history-deleted">' . $link . '</span>';
1340                         return $link;
1341                 }
1342         }
1343
1344         /**
1345          * Fetch image view link if it's available to all users
1346          *
1347          * @param $file File
1348          * @param $sk Skin
1349          * @return String: HTML fragment
1350          */
1351         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1352                 global $wgLang, $wgUser;
1353
1354                 if( !$file->userCan(File::DELETED_FILE) ) {
1355                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1356                 } else {
1357                         $link = $sk->linkKnown(
1358                                 $titleObj,
1359                                 $wgLang->timeanddate( $ts, true ),
1360                                 array(),
1361                                 array(
1362                                         'target' => $this->mTargetObj->getPrefixedText(),
1363                                         'file' => $key,
1364                                         'token' => $wgUser->editToken( $key )
1365                                 )
1366                         );
1367                         if( $file->isDeleted(File::DELETED_FILE) )
1368                                 $link = '<span class="history-deleted">' . $link . '</span>';
1369                         return $link;
1370                 }
1371         }
1372
1373         /**
1374          * Fetch file's user id if it's available to this user
1375          *
1376          * @param $file File
1377          * @param $sk Skin
1378          * @return String: HTML fragment
1379          */
1380         function getFileUser( $file, $sk ) {
1381                 if( !$file->userCan(File::DELETED_USER) ) {
1382                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1383                 } else {
1384                         $link = $sk->userLink( $file->getRawUser(), $file->getRawUserText() ) .
1385                                 $sk->userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1386                         if( $file->isDeleted(File::DELETED_USER) )
1387                                 $link = '<span class="history-deleted">' . $link . '</span>';
1388                         return $link;
1389                 }
1390         }
1391
1392         /**
1393          * Fetch file upload comment if it's available to this user
1394          *
1395          * @param $file File
1396          * @param $sk Skin
1397          * @return String: HTML fragment
1398          */
1399         function getFileComment( $file, $sk ) {
1400                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1401                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1402                 } else {
1403                         $link = $sk->commentBlock( $file->getRawDescription() );
1404                         if( $file->isDeleted(File::DELETED_COMMENT) )
1405                                 $link = '<span class="history-deleted">' . $link . '</span>';
1406                         return $link;
1407                 }
1408         }
1409
1410         function undelete() {
1411                 global $wgOut, $wgUser;
1412                 if ( wfReadOnly() ) {
1413                         $wgOut->readOnlyPage();
1414                         return;
1415                 }
1416                 if( !is_null( $this->mTargetObj ) ) {
1417                         $archive = new PageArchive( $this->mTargetObj );
1418                         $ok = $archive->undelete(
1419                                 $this->mTargetTimestamp,
1420                                 $this->mComment,
1421                                 $this->mFileVersions,
1422                                 $this->mUnsuppress );
1423
1424                         if( is_array($ok) ) {
1425                                 if ( $ok[1] ) // Undeleted file count
1426                                         wfRunHooks( 'FileUndeleteComplete', array(
1427                                                 $this->mTargetObj, $this->mFileVersions,
1428                                                 $wgUser, $this->mComment) );
1429
1430                                 $skin = $wgUser->getSkin();
1431                                 $link = $skin->linkKnown( $this->mTargetObj );
1432                                 $wgOut->addWikiMsgArray( 'undeletedpage', array( $link ), array( 'replaceafter' ) );
1433                         } else {
1434                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1435                                 $wgOut->addWikiMsg( 'undeleterevdel' );
1436                         }
1437
1438                         // Show file deletion warnings and errors
1439                         $status = $archive->getFileStatus();
1440                         if( $status && !$status->isGood() ) {
1441                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1442                         }
1443                 } else {
1444                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1445                 }
1446                 return false;
1447         }
1448 }