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         /**
  84          * @param $dbr DatabaseBase
  85          * @param $condition
  86          * @return bool|ResultWrapper
  87          */
  88         protected static function listPages( $dbr, $condition ) {
  89                 return $dbr->resultObject(
  90                         $dbr->select(
  91                                 array( 'archive' ),
  92                                 array(
  93                                         'ar_namespace',
  94                                         'ar_title',
  95                                         'count' => 'COUNT(*)'
  96                                 ),
  97                                 $condition,
  98                                 __METHOD__,
  99                                 array(
 100                                         'GROUP BY' => array( 'ar_namespace', 'ar_title' ),
 101                                         'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 102                                         'LIMIT' => 100,
 103                                 )
 104                         )
 105                 );
 106         }
 107
 108         /**
 109          * List the revisions of the given page. Returns result wrapper with
 110          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 111          *
 112          * @return ResultWrapper
 113          */
 114         function listRevisions() {
 115                 $dbr = wfGetDB( DB_SLAVE );
 116                 $res = $dbr->select( 'archive',
 117                         array(
 118                                 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 119                                 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1'
 120                         ),
 121                         array( 'ar_namespace' => $this->title->getNamespace(),
 122                                    'ar_title' => $this->title->getDBkey() ),
 123                         'PageArchive::listRevisions',
 124                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 125                 $ret = $dbr->resultObject( $res );
 126                 return $ret;
 127         }
 128
 129         /**
 130          * List the deleted file revisions for this page, if it's a file page.
 131          * Returns a result wrapper with various filearchive fields, or null
 132          * if not a file page.
 133          *
 134          * @return ResultWrapper
 135          * @todo Does this belong in Image for fuller encapsulation?
 136          */
 137         function listFiles() {
 138                 if( $this->title->getNamespace() == NS_FILE ) {
 139                         $dbr = wfGetDB( DB_SLAVE );
 140                         $res = $dbr->select( 'filearchive',
 141                                 array(
 142                                         'fa_id',
 143                                         'fa_name',
 144                                         'fa_archive_name',
 145                                         'fa_storage_key',
 146                                         'fa_storage_group',
 147                                         'fa_size',
 148                                         'fa_width',
 149                                         'fa_height',
 150                                         'fa_bits',
 151                                         'fa_metadata',
 152                                         'fa_media_type',
 153                                         'fa_major_mime',
 154                                         'fa_minor_mime',
 155                                         'fa_description',
 156                                         'fa_user',
 157                                         'fa_user_text',
 158                                         'fa_timestamp',
 159                                         'fa_deleted' ),
 160                                 array( 'fa_name' => $this->title->getDBkey() ),
 161                                 __METHOD__,
 162                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 163                         $ret = $dbr->resultObject( $res );
 164                         return $ret;
 165                 }
 166                 return null;
 167         }
 168
 169         /**
 170          * Return a Revision object containing data for the deleted revision.
 171          * Note that the result *may* or *may not* have a null page ID.
 172          *
 173          * @param $timestamp String
 174          * @return Revision
 175          */
 176         function getRevision( $timestamp ) {
 177                 $dbr = wfGetDB( DB_SLAVE );
 178                 $row = $dbr->selectRow( 'archive',
 179                         array(
 180                                 'ar_rev_id',
 181                                 'ar_text',
 182                                 'ar_comment',
 183                                 'ar_user',
 184                                 'ar_user_text',
 185                                 'ar_timestamp',
 186                                 'ar_minor_edit',
 187                                 'ar_flags',
 188                                 'ar_text_id',
 189                                 'ar_deleted',
 190                                 'ar_len',
 191                                 'ar_sha1',
 192                         ),
 193                         array( 'ar_namespace' => $this->title->getNamespace(),
 194                                         'ar_title' => $this->title->getDBkey(),
 195                                         'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 196                         __METHOD__ );
 197                 if( $row ) {
 198                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleID() ) );
 199                 } else {
 200                         return null;
 201                 }
 202         }
 203
 204         /**
 205          * Return the most-previous revision, either live or deleted, against
 206          * the deleted revision given by timestamp.
 207          *
 208          * May produce unexpected results in case of history merges or other
 209          * unusual time issues.
 210          *
 211          * @param $timestamp String
 212          * @return Revision or null
 213          */
 214         function getPreviousRevision( $timestamp ) {
 215                 $dbr = wfGetDB( DB_SLAVE );
 216
 217                 // Check the previous deleted revision...
 218                 $row = $dbr->selectRow( 'archive',
 219                         'ar_timestamp',
 220                         array( 'ar_namespace' => $this->title->getNamespace(),
 221                                    'ar_title' => $this->title->getDBkey(),
 222                                    'ar_timestamp < ' .
 223                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 224                         __METHOD__,
 225                         array(
 226                                 'ORDER BY' => 'ar_timestamp DESC',
 227                                 'LIMIT' => 1 ) );
 228                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 229
 230                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 231                         array( 'rev_id', 'rev_timestamp' ),
 232                         array(
 233                                 'page_namespace' => $this->title->getNamespace(),
 234                                 'page_title' => $this->title->getDBkey(),
 235                                 'page_id = rev_page',
 236                                 'rev_timestamp < ' .
 237                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 238                         __METHOD__,
 239                         array(
 240                                 'ORDER BY' => 'rev_timestamp DESC',
 241                                 'LIMIT' => 1 ) );
 242                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 243                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 244
 245                 if( $prevLive && $prevLive > $prevDeleted ) {
 246                         // Most prior revision was live
 247                         return Revision::newFromId( $prevLiveId );
 248                 } elseif( $prevDeleted ) {
 249                         // Most prior revision was deleted
 250                         return $this->getRevision( $prevDeleted );
 251                 } else {
 252                         // No prior revision on this page.
 253                         return null;
 254                 }
 255         }
 256
 257         /**
 258          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 259          *
 260          * @param $row Object: database row
 261          * @return Revision
 262          */
 263         function getTextFromRow( $row ) {
 264                 if( is_null( $row->ar_text_id ) ) {
 265                         // An old row from MediaWiki 1.4 or previous.
 266                         // Text is embedded in this row in classic compression format.
 267                         return Revision::getRevisionText( $row, 'ar_' );
 268                 } else {
 269                         // New-style: keyed to the text storage backend.
 270                         $dbr = wfGetDB( DB_SLAVE );
 271                         $text = $dbr->selectRow( 'text',
 272                                 array( 'old_text', 'old_flags' ),
 273                                 array( 'old_id' => $row->ar_text_id ),
 274                                 __METHOD__ );
 275                         return Revision::getRevisionText( $text );
 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          * @param $user User doing the action, or null to use $wgUser
 325          *
 326          * @return array(number of file revisions restored, number of image revisions restored, log message)
 327          * on success, false on failure
 328          */
 329         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false, User $user = null ) {
 330                 global $wgContLang, $wgUser;
 331
 332                 // If both the set of text revisions and file revisions are empty,
 333                 // restore everything. Otherwise, just restore the requested items.
 334                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 335
 336                 $restoreText = $restoreAll || !empty( $timestamps );
 337                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 338
 339                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 340                         $img = wfLocalFile( $this->title );
 341                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 342                         if ( !$this->fileStatus->isOk() ) {
 343                                 return false;
 344                         }
 345                         $filesRestored = $this->fileStatus->successCount;
 346                 } else {
 347                         $filesRestored = 0;
 348                 }
 349
 350                 if( $restoreText ) {
 351                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 352                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 353                                 return false;
 354                         }
 355                 } else {
 356                         $textRestored = 0;
 357                 }
 358
 359                 // Touch the log!
 360
 361                 if( $textRestored && $filesRestored ) {
 362                         $reason = wfMessage( 'undeletedrevisions-files' )
 363                                 ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
 364                 } elseif( $textRestored ) {
 365                         $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
 366                                 ->inContentLanguage()->text();
 367                 } elseif( $filesRestored ) {
 368                         $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
 369                                 ->inContentLanguage()->text();
 370                 } else {
 371                         wfDebug( "Undelete: nothing undeleted...\n" );
 372                         return false;
 373                 }
 374
 375                 if( trim( $comment ) != '' ) {
 376                         $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
 377                 }
 378
 379                 if ( $user === null ) {
 380                         $user = $wgUser;
 381                 }
 382
 383                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 384                 $logEntry->setPerformer( $user );
 385                 $logEntry->setTarget( $this->title );
 386                 $logEntry->setComment( $reason );
 387                 $logid = $logEntry->insert();
 388                 $logEntry->publish( $logid );
 389
 390                 return array( $textRestored, $filesRestored, $reason );
 391         }
 392
 393         /**
 394          * This is the meaty bit -- restores archived revisions of the given page
 395          * to the cur/old tables. If the page currently exists, all revisions will
 396          * be stuffed into old, otherwise the most recent will go into cur.
 397          *
 398          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 399          * @param $comment String
 400          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 401          *
 402          * @return Mixed: number of revisions restored or false on failure
 403          */
 404         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 405                 if ( wfReadOnly() ) {
 406                         return false;
 407                 }
 408                 $restoreAll = empty( $timestamps );
 409
 410                 $dbw = wfGetDB( DB_MASTER );
 411
 412                 # Does this page already exist? We'll have to update it...
 413                 $article = WikiPage::factory( $this->title );
 414                 # Load latest data for the current page (bug 31179)
 415                 $article->loadPageData( 'fromdbmaster' );
 416                 $oldcountable = $article->isCountable();
 417
 418                 $page = $dbw->selectRow( 'page',
 419                         array( 'page_id', 'page_latest' ),
 420                         array( 'page_namespace' => $this->title->getNamespace(),
 421                                    'page_title'     => $this->title->getDBkey() ),
 422                         __METHOD__,
 423                         array( 'FOR UPDATE' ) // lock page
 424                 );
 425                 if( $page ) {
 426                         $makepage = false;
 427                         # Page already exists. Import the history, and if necessary
 428                         # we'll update the latest revision field in the record.
 429                         $newid             = 0;
 430                         $pageId            = $page->page_id;
 431                         $previousRevId    = $page->page_latest;
 432                         # Get the time span of this page
 433                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 434                                 array( 'rev_id' => $previousRevId ),
 435                                 __METHOD__ );
 436                         if( $previousTimestamp === false ) {
 437                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 438                                 return 0;
 439                         }
 440                 } else {
 441                         # Have to create a new article...
 442                         $makepage = true;
 443                         $previousRevId = 0;
 444                         $previousTimestamp = 0;
 445                 }
 446
 447                 if( $restoreAll ) {
 448                         $oldones = '1 = 1'; # All revisions...
 449                 } else {
 450                         $oldts = implode( ',',
 451                                 array_map( array( &$dbw, 'addQuotes' ),
 452                                         array_map( array( &$dbw, 'timestamp' ),
 453                                                 $timestamps ) ) );
 454
 455                         $oldones = "ar_timestamp IN ( {$oldts} )";
 456                 }
 457
 458                 /**
 459                  * Select each archived revision...
 460                  */
 461                 $result = $dbw->select( 'archive',
 462                         /* fields */ array(
 463                                 'ar_rev_id',
 464                                 'ar_text',
 465                                 'ar_comment',
 466                                 'ar_user',
 467                                 'ar_user_text',
 468                                 'ar_timestamp',
 469                                 'ar_minor_edit',
 470                                 'ar_flags',
 471                                 'ar_text_id',
 472                                 'ar_deleted',
 473                                 'ar_page_id',
 474                                 'ar_len',
 475                                 'ar_sha1' ),
 476                         /* WHERE */ array(
 477                                 'ar_namespace' => $this->title->getNamespace(),
 478                                 'ar_title'     => $this->title->getDBkey(),
 479                                 $oldones ),
 480                         __METHOD__,
 481                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 482                 );
 483                 $ret = $dbw->resultObject( $result );
 484                 $rev_count = $dbw->numRows( $result );
 485                 if( !$rev_count ) {
 486                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 487                         return false; // ???
 488                 }
 489
 490                 $ret->seek( $rev_count - 1 ); // move to last
 491                 $row = $ret->fetchObject(); // get newest archived rev
 492                 $ret->seek( 0 ); // move back
 493
 494                 if( $makepage ) {
 495                         // Check the state of the newest to-be version...
 496                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 497                                 return false; // we can't leave the current revision like this!
 498                         }
 499                         // Safe to insert now...
 500                         $newid  = $article->insertOn( $dbw );
 501                         $pageId = $newid;
 502                 } else {
 503                         // Check if a deleted revision will become the current revision...
 504                         if( $row->ar_timestamp > $previousTimestamp ) {
 505                                 // Check the state of the newest to-be version...
 506                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 507                                         return false; // we can't leave the current revision like this!
 508                                 }
 509                         }
 510                 }
 511
 512                 $revision = null;
 513                 $restored = 0;
 514
 515                 foreach ( $ret as $row ) {
 516                         // Check for key dupes due to shitty archive integrity.
 517                         if( $row->ar_rev_id ) {
 518                                 $exists = $dbw->selectField( 'revision', '1',
 519                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 520                                 if( $exists ) {
 521                                         continue; // don't throw DB errors
 522                                 }
 523                         }
 524                         // Insert one revision at a time...maintaining deletion status
 525                         // unless we are specifically removing all restrictions...
 526                         $revision = Revision::newFromArchiveRow( $row,
 527                                 array(
 528                                         'page' => $pageId,
 529                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 530                                 ) );
 531
 532                         $revision->insertOn( $dbw );
 533                         $restored++;
 534
 535                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 536                 }
 537                 # Now that it's safely stored, take it out of the archive
 538                 $dbw->delete( 'archive',
 539                         /* WHERE */ array(
 540                                 'ar_namespace' => $this->title->getNamespace(),
 541                                 'ar_title' => $this->title->getDBkey(),
 542                                 $oldones ),
 543                         __METHOD__ );
 544
 545                 // Was anything restored at all?
 546                 if ( $restored == 0 ) {
 547                         return 0;
 548                 }
 549
 550                 $created = (bool)$newid;
 551
 552                 // Attach the latest revision to the page...
 553                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 554                 if ( $created || $wasnew ) {
 555                         // Update site stats, link tables, etc
 556                         $user = User::newFromName( $revision->getRawUserText(), false );
 557                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 558                 }
 559
 560                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 561
 562                 if( $this->title->getNamespace() == NS_FILE ) {
 563                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 564                         $update->doUpdate();
 565                 }
 566
 567                 return $restored;
 568         }
 569
 570         /**
 571          * @return Status
 572          */
 573         function getFileStatus() { return $this->fileStatus; }
 574 }
 575
 576 /**
 577  * Special page allowing users with the appropriate permissions to view
 578  * and restore deleted content.
 579  *
 580  * @ingroup SpecialPage
 581  */
 582 class SpecialUndelete extends SpecialPage {
 583         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 584         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 585
 586         /**
 587          * @var Title
 588          */
 589         var $mTargetObj;
 590
 591         function __construct() {
 592                 parent::__construct( 'Undelete', 'deletedhistory' );
 593         }
 594
 595         function loadRequest( $par ) {
 596                 $request = $this->getRequest();
 597                 $user = $this->getUser();
 598
 599                 $this->mAction = $request->getVal( 'action' );
 600                 if ( $par !== null && $par !== '' ) {
 601                         $this->mTarget = $par;
 602                 } else {
 603                         $this->mTarget = $request->getVal( 'target' );
 604                 }
 605                 $this->mTargetObj = null;
 606                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 607                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 608                 }
 609                 $this->mSearchPrefix = $request->getText( 'prefix' );
 610                 $time = $request->getVal( 'timestamp' );
 611                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 612                 $this->mFilename = $request->getVal( 'file' );
 613
 614                 $posted = $request->wasPosted() &&
 615                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 616                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 617                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 618                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 619                 $this->mDiff = $request->getCheck( 'diff' );
 620                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 621                 $this->mComment = $request->getText( 'wpComment' );
 622                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 623                 $this->mToken = $request->getVal( 'token' );
 624
 625                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 626                         $this->mAllowed = true; // user can restore
 627                         $this->mCanView = true; // user can view content
 628                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 629                         $this->mAllowed = false; // user cannot restore
 630                         $this->mCanView = true; // user can view content
 631                         $this->mRestore = false;
 632                 } else { // user can only view the list of revisions
 633                         $this->mAllowed = false;
 634                         $this->mCanView = false;
 635                         $this->mTimestamp = '';
 636                         $this->mRestore = false;
 637                 }
 638
 639                 if( $this->mRestore || $this->mInvert ) {
 640                         $timestamps = array();
 641                         $this->mFileVersions = array();
 642                         foreach( $request->getValues() as $key => $val ) {
 643                                 $matches = array();
 644                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 645                                         array_push( $timestamps, $matches[1] );
 646                                 }
 647
 648                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 649                                         $this->mFileVersions[] = intval( $matches[1] );
 650                                 }
 651                         }
 652                         rsort( $timestamps );
 653                         $this->mTargetTimestamp = $timestamps;
 654                 }
 655         }
 656
 657         function execute( $par ) {
 658                 $this->checkPermissions();
 659                 $user = $this->getUser();
 660
 661                 $this->setHeaders();
 662                 $this->outputHeader();
 663
 664                 $this->loadRequest( $par );
 665
 666                 $out = $this->getOutput();
 667
 668                 if ( is_null( $this->mTargetObj ) ) {
 669                         $out->addWikiMsg( 'undelete-header' );
 670
 671                         # Not all users can just browse every deleted page from the list
 672                         if ( $user->isAllowed( 'browsearchive' ) ) {
 673                                 $this->showSearchForm();
 674                         }
 675                         return;
 676                 }
 677
 678                 if ( $this->mAllowed ) {
 679                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 680                 } else {
 681                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 682                 }
 683
 684                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 685
 686                 if ( $this->mTimestamp !== '' ) {
 687                         $this->showRevision( $this->mTimestamp );
 688                 } elseif ( $this->mFilename !== null ) {
 689                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 690                         // Check if user is allowed to see this file
 691                         if ( !$file->exists() ) {
 692                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 693                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 694                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 695                                         throw new PermissionsError( 'suppressrevision' );
 696                                 } else {
 697                                         throw new PermissionsError( 'deletedtext' );
 698                                 }
 699                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 700                                 $this->showFileConfirmationForm( $this->mFilename );
 701                         } else {
 702                                 $this->showFile( $this->mFilename );
 703                         }
 704                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 705                         $this->undelete();
 706                 } else {
 707                         $this->showHistory();
 708                 }
 709         }
 710
 711         function showSearchForm() {
 712                 global $wgScript;
 713
 714                 $out = $this->getOutput();
 715                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 716                 $out->addHTML(
 717                         Xml::openElement( 'form', array(
 718                                 'method' => 'get',
 719                                 'action' => $wgScript ) ) .
 720                         Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 721                         Html::hidden( 'title',
 722                                 $this->getTitle()->getPrefixedDbKey() ) .
 723                         Xml::inputLabel( $this->msg( 'undelete-search-prefix' )->text(),
 724                                 'prefix', 'prefix', 20,
 725                                 $this->mSearchPrefix ) . ' ' .
 726                         Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 727                         Xml::closeElement( 'fieldset' ) .
 728                         Xml::closeElement( 'form' )
 729                 );
 730
 731                 # List undeletable articles
 732                 if( $this->mSearchPrefix ) {
 733                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 734                         $this->showList( $result );
 735                 }
 736         }
 737
 738         /**
 739          * Generic list of deleted pages
 740          *
 741          * @param $result ResultWrapper
 742          * @return bool
 743          */
 744         private function showList( $result ) {
 745                 $out = $this->getOutput();
 746
 747                 if( $result->numRows() == 0 ) {
 748                         $out->addWikiMsg( 'undelete-no-results' );
 749                         return;
 750                 }
 751
 752                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 753
 754                 $undelete = $this->getTitle();
 755                 $out->addHTML( "<ul>\n" );
 756                 foreach ( $result as $row ) {
 757                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 758                         if ( $title !== null ) {
 759                                 $item = Linker::linkKnown(
 760                                         $undelete,
 761                                         htmlspecialchars( $title->getPrefixedText() ),
 762                                         array(),
 763                                         array( 'target' => $title->getPrefixedText() )
 764                                 );
 765                         } else {
 766                                 // The title is no longer valid, show as text
 767                                 $item = Html::element( 'span', array( 'class' => 'mw-invalidtitle' ),
 768                                         Linker::getInvalidTitleDescription( $this->getContext(), $row->ar_namespace, $row->ar_title ) );
 769                         }
 770                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 771                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 772                 }
 773                 $result->free();
 774                 $out->addHTML( "</ul>\n" );
 775
 776                 return true;
 777         }
 778
 779         private function showRevision( $timestamp ) {
 780                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 781                         return 0;
 782                 }
 783
 784                 $archive = new PageArchive( $this->mTargetObj );
 785                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 786                 $rev = $archive->getRevision( $timestamp );
 787
 788                 $out = $this->getOutput();
 789                 $user = $this->getUser();
 790
 791                 if( !$rev ) {
 792                         $out->addWikiMsg( 'undeleterevision-missing' );
 793                         return;
 794                 }
 795
 796                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 797                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 798                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 799                                 return;
 800                         } else {
 801                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 802                                 $out->addHTML( '<br />' );
 803                                 // and we are allowed to see...
 804                         }
 805                 }
 806
 807                 if( $this->mDiff ) {
 808                         $previousRev = $archive->getPreviousRevision( $timestamp );
 809                         if( $previousRev ) {
 810                                 $this->showDiff( $previousRev, $rev );
 811                                 if( $this->mDiffOnly ) {
 812                                         return;
 813                                 } else {
 814                                         $out->addHTML( '<hr />' );
 815                                 }
 816                         } else {
 817                                 $out->addWikiMsg( 'undelete-nodiff' );
 818                         }
 819                 }
 820
 821                 $link = Linker::linkKnown(
 822                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 823                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 824                 );
 825
 826                 $lang = $this->getLanguage();
 827
 828                 // date and time are separate parameters to facilitate localisation.
 829                 // $time is kept for backward compat reasons.
 830                 $time = $lang->userTimeAndDate( $timestamp, $user );
 831                 $d = $lang->userDate( $timestamp, $user );
 832                 $t = $lang->userTime( $timestamp, $user );
 833                 $userLink = Linker::revUserTools( $rev );
 834
 835                 if( $this->mPreview ) {
 836                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 837                 } else {
 838                         $openDiv = '<div id="mw-undelete-revision">';
 839                 }
 840                 $out->addHTML( $openDiv );
 841
 842                 // Revision delete links
 843                 if ( !$this->mDiff ) {
 844                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 845                         if ( $revdel ) {
 846                                 $out->addHTML( "$revdel " );
 847                         }
 848                 }
 849
 850                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 851                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 852                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 853
 854                 if( $this->mPreview ) {
 855                         // Hide [edit]s
 856                         $popts = $out->parserOptions();
 857                         $popts->setEditSection( false );
 858                         $out->parserOptions( $popts );
 859                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER, $user ), $this->mTargetObj, true );
 860                 }
 861
 862                 $out->addHTML(
 863                         Xml::element( 'textarea', array(
 864                                         'readonly' => 'readonly',
 865                                         'cols' => intval( $user->getOption( 'cols' ) ),
 866                                         'rows' => intval( $user->getOption( 'rows' ) ) ),
 867                                 $rev->getText( Revision::FOR_THIS_USER, $user ) . "\n" ) .
 868                         Xml::openElement( 'div' ) .
 869                         Xml::openElement( 'form', array(
 870                                 'method' => 'post',
 871                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 872                         Xml::element( 'input', array(
 873                                 'type' => 'hidden',
 874                                 'name' => 'target',
 875                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 876                         Xml::element( 'input', array(
 877                                 'type' => 'hidden',
 878                                 'name' => 'timestamp',
 879                                 'value' => $timestamp ) ) .
 880                         Xml::element( 'input', array(
 881                                 'type' => 'hidden',
 882                                 'name' => 'wpEditToken',
 883                                 'value' => $user->getEditToken() ) ) .
 884                         Xml::element( 'input', array(
 885                                 'type' => 'submit',
 886                                 'name' => 'preview',
 887                                 'value' => $this->msg( 'showpreview' )->text() ) ) .
 888                         Xml::element( 'input', array(
 889                                 'name' => 'diff',
 890                                 'type' => 'submit',
 891                                 'value' => $this->msg( 'showdiff' )->text() ) ) .
 892                         Xml::closeElement( 'form' ) .
 893                         Xml::closeElement( 'div' ) );
 894         }
 895
 896         /**
 897          * Build a diff display between this and the previous either deleted
 898          * or non-deleted edit.
 899          *
 900          * @param $previousRev Revision
 901          * @param $currentRev Revision
 902          * @return String: HTML
 903          */
 904         function showDiff( $previousRev, $currentRev ) {
 905                 $diffEngine = new DifferenceEngine( $this->getContext() );
 906                 $diffEngine->showDiffStyle();
 907                 $this->getOutput()->addHTML(
 908                         "<div>" .
 909                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 910                         "<col class='diff-marker' />" .
 911                         "<col class='diff-content' />" .
 912                         "<col class='diff-marker' />" .
 913                         "<col class='diff-content' />" .
 914                         "<tr>" .
 915                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 916                                 $this->diffHeader( $previousRev, 'o' ) .
 917                                 "</td>\n" .
 918                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 919                                 $this->diffHeader( $currentRev, 'n' ) .
 920                                 "</td>\n" .
 921                         "</tr>" .
 922                         $diffEngine->generateDiffBody(
 923                                 $previousRev->getText( Revision::FOR_THIS_USER, $this->getUser() ),
 924                                 $currentRev->getText( Revision::FOR_THIS_USER, $this->getUser() ) ) .
 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                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 937                 if( $isDeleted ) {
 938                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 939                         $targetPage = $this->getTitle();
 940                         $targetQuery = array(
 941                                 'target' => $this->mTargetObj->getPrefixedText(),
 942                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 943                         );
 944                 } else {
 945                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 946                         $targetPage = $rev->getTitle();
 947                         $targetQuery = array( 'oldid' => $rev->getId() );
 948                 }
 949                 // Add show/hide deletion links if available
 950                 $user = $this->getUser();
 951                 $lang = $this->getLanguage();
 952                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 953                 if ( $rdel ) $rdel = " $rdel";
 954                 return
 955                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 956                                 Linker::link(
 957                                         $targetPage,
 958                                         $this->msg(
 959                                                 'revisionasof',
 960                                                 $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
 961                                                 $lang->userDate( $rev->getTimestamp(), $user ),
 962                                                 $lang->userTime( $rev->getTimestamp(), $user )
 963                                         )->escaped(),
 964                                         array(),
 965                                         $targetQuery
 966                                 ) .
 967                         '</strong></div>' .
 968                         '<div id="mw-diff-'.$prefix.'title2">' .
 969                                 Linker::revUserTools( $rev ) . '<br />' .
 970                         '</div>' .
 971                         '<div id="mw-diff-'.$prefix.'title3">' .
 972                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 973                         '</div>';
 974         }
 975
 976         /**
 977          * Show a form confirming whether a tokenless user really wants to see a file
 978          */
 979         private function showFileConfirmationForm( $key ) {
 980                 $out = $this->getOutput();
 981                 $lang = $this->getLanguage();
 982                 $user = $this->getUser();
 983                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 984                 $out->addWikiMsg( 'undelete-show-file-confirm',
 985                         $this->mTargetObj->getText(),
 986                         $lang->userDate( $file->getTimestamp(), $user ),
 987                         $lang->userTime( $file->getTimestamp(), $user ) );
 988                 $out->addHTML(
 989                         Xml::openElement( 'form', array(
 990                                 'method' => 'POST',
 991                                 'action' => $this->getTitle()->getLocalURL(
 992                                         'target=' . urlencode( $this->mTarget ) .
 993                                         '&file=' . urlencode( $key ) .
 994                                         '&token=' . urlencode( $user->getEditToken( $key ) ) )
 995                                 )
 996                         ) .
 997                         Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
 998                         '</form>'
 999                 );
1000         }
1001
1002         /**
1003          * Show a deleted file version requested by the visitor.
1004          */
1005         private function showFile( $key ) {
1006                 $this->getOutput()->disable();
1007
1008                 # We mustn't allow the output to be Squid cached, otherwise
1009                 # if an admin previews a deleted image, and it's cached, then
1010                 # a user without appropriate permissions can toddle off and
1011                 # nab the image, and Squid will serve it
1012                 $response = $this->getRequest()->response();
1013                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1014                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1015                 $response->header( 'Pragma: no-cache' );
1016
1017                 $repo = RepoGroup::singleton()->getLocalRepo();
1018                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1019                 $repo->streamFile( $path );
1020         }
1021
1022         private function showHistory() {
1023                 $out = $this->getOutput();
1024                 if( $this->mAllowed ) {
1025                         $out->addModules( 'mediawiki.special.undelete' );
1026                 }
1027                 $out->wrapWikiMsg(
1028                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1029                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1030                 );
1031
1032                 $archive = new PageArchive( $this->mTargetObj );
1033                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1034                 /*
1035                 $text = $archive->getLastRevisionText();
1036                 if( is_null( $text ) ) {
1037                         $out->addWikiMsg( 'nohistory' );
1038                         return;
1039                 }
1040                 */
1041                 $out->addHTML( '<div class="mw-undelete-history">' );
1042                 if ( $this->mAllowed ) {
1043                         $out->addWikiMsg( 'undeletehistory' );
1044                         $out->addWikiMsg( 'undeleterevdel' );
1045                 } else {
1046                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1047                 }
1048                 $out->addHTML( '</div>' );
1049
1050                 # List all stored revisions
1051                 $revisions = $archive->listRevisions();
1052                 $files = $archive->listFiles();
1053
1054                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1055                 $haveFiles = $files && $files->numRows() > 0;
1056
1057                 # Batch existence check on user and talk pages
1058                 if( $haveRevisions ) {
1059                         $batch = new LinkBatch();
1060                         foreach ( $revisions as $row ) {
1061                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1062                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1063                         }
1064                         $batch->execute();
1065                         $revisions->seek( 0 );
1066                 }
1067                 if( $haveFiles ) {
1068                         $batch = new LinkBatch();
1069                         foreach ( $files as $row ) {
1070                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1071                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1072                         }
1073                         $batch->execute();
1074                         $files->seek( 0 );
1075                 }
1076
1077                 if ( $this->mAllowed ) {
1078                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1079                         # Start the form here
1080                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1081                         $out->addHTML( $top );
1082                 }
1083
1084                 # Show relevant lines from the deletion log:
1085                 $deleteLogPage = new LogPage( 'delete' );
1086                 $out->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) . "\n" );
1087                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1088                 # Show relevant lines from the suppression log:
1089                 $suppressLogPage = new LogPage( 'suppress' );
1090                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1091                         $out->addHTML( Xml::element( 'h2', null, $suppressLogPage->getName()->text() ) . "\n" );
1092                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1093                 }
1094
1095                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1096                         # Format the user-visible controls (comment field, submission button)
1097                         # in a nice little table
1098                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1099                                 $unsuppressBox =
1100                                         "<tr>
1101                                                 <td>&#160;</td>
1102                                                 <td class='mw-input'>" .
1103                                                         Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1104                                                                 'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ).
1105                                                 "</td>
1106                                         </tr>";
1107                         } else {
1108                                 $unsuppressBox = '';
1109                         }
1110                         $table =
1111                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1112                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1113                                         "<tr>
1114                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1115                                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1116                                                 "</td>
1117                                         </tr>
1118                                         <tr>
1119                                                 <td class='mw-label'>" .
1120                                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1121                                                 "</td>
1122                                                 <td class='mw-input'>" .
1123                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1124                                                 "</td>
1125                                         </tr>
1126                                         <tr>
1127                                                 <td>&#160;</td>
1128                                                 <td class='mw-submit'>" .
1129                                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1130                                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1131                                                 "</td>
1132                                         </tr>" .
1133                                         $unsuppressBox .
1134                                 Xml::closeElement( 'table' ) .
1135                                 Xml::closeElement( 'fieldset' );
1136
1137                         $out->addHTML( $table );
1138                 }
1139
1140                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1141
1142                 if( $haveRevisions ) {
1143                         # The page's stored (deleted) history:
1144                         $out->addHTML( '<ul>' );
1145                         $remaining = $revisions->numRows();
1146                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1147
1148                         foreach ( $revisions as $row ) {
1149                                 $remaining--;
1150                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1151                         }
1152                         $revisions->free();
1153                         $out->addHTML( '</ul>' );
1154                 } else {
1155                         $out->addWikiMsg( 'nohistory' );
1156                 }
1157
1158                 if( $haveFiles ) {
1159                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1160                         $out->addHTML( '<ul>' );
1161                         foreach ( $files as $row ) {
1162                                 $out->addHTML( $this->formatFileRow( $row ) );
1163                         }
1164                         $files->free();
1165                         $out->addHTML( '</ul>' );
1166                 }
1167
1168                 if ( $this->mAllowed ) {
1169                         # Slip in the hidden controls here
1170                         $misc  = Html::hidden( 'target', $this->mTarget );
1171                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1172                         $misc .= Xml::closeElement( 'form' );
1173                         $out->addHTML( $misc );
1174                 }
1175
1176                 return true;
1177         }
1178
1179         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1180                 $rev = Revision::newFromArchiveRow( $row,
1181                         array( 'page' => $this->mTargetObj->getArticleID() ) );
1182                 $revTextSize = '';
1183                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1184                 // Build checkboxen...
1185                 if( $this->mAllowed ) {
1186                         if( $this->mInvert ) {
1187                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1188                                         $checkBox = Xml::check( "ts$ts" );
1189                                 } else {
1190                                         $checkBox = Xml::check( "ts$ts", true );
1191                                 }
1192                         } else {
1193                                 $checkBox = Xml::check( "ts$ts" );
1194                         }
1195                 } else {
1196                         $checkBox = '';
1197                 }
1198                 $user = $this->getUser();
1199                 // Build page & diff links...
1200                 if( $this->mCanView ) {
1201                         $titleObj = $this->getTitle();
1202                         # Last link
1203                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1204                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1205                                 $last = $this->msg( 'diff' )->escaped();
1206                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1207                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1208                                 $last = Linker::linkKnown(
1209                                         $titleObj,
1210                                         $this->msg( 'diff' )->escaped(),
1211                                         array(),
1212                                         array(
1213                                                 'target' => $this->mTargetObj->getPrefixedText(),
1214                                                 'timestamp' => $ts,
1215                                                 'diff' => 'prev'
1216                                         )
1217                                 );
1218                         } else {
1219                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1220                                 $last = $this->msg( 'diff' )->escaped();
1221                         }
1222                 } else {
1223                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1224                         $last = $this->msg( 'diff' )->escaped();
1225                 }
1226                 // User links
1227                 $userLink = Linker::revUserTools( $rev );
1228                 // Revision text size
1229                 $size = $row->ar_len;
1230                 if( !is_null( $size ) ) {
1231                         $revTextSize = Linker::formatRevisionSize( $size );
1232                 }
1233                 // Edit summary
1234                 $comment = Linker::revComment( $rev );
1235                 // Revision delete links
1236                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1237
1238                 $revisionRow = $this->msg( 'undelete-revisionrow' )->rawParams( $checkBox, $revdlink, $last, $pageLink , $userLink, $revTextSize, $comment )->escaped();
1239                 return "<li>$revisionRow</li>";
1240         }
1241
1242         private function formatFileRow( $row ) {
1243                 $file = ArchivedFile::newFromRow( $row );
1244
1245                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1246                 $user = $this->getUser();
1247                 if( $this->mAllowed && $row->fa_storage_key ) {
1248                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1249                         $key = urlencode( $row->fa_storage_key );
1250                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1251                 } else {
1252                         $checkBox = '';
1253                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1254                 }
1255                 $userLink = $this->getFileUser( $file );
1256                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1257                 $bytes = $this->msg( 'parentheses' )->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )->plain();
1258                 $data = htmlspecialchars( $data . ' ' . $bytes );
1259                 $comment = $this->getFileComment( $file );
1260
1261                 // Add show/hide deletion links if available
1262                 $canHide = $user->isAllowed( 'deleterevision' );
1263                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1264                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1265                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1266                         } else {
1267                                 $query = array(
1268                                         'type' => 'filearchive',
1269                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1270                                         'ids' => $row->fa_id
1271                                 );
1272                                 $revdlink = Linker::revDeleteLink( $query,
1273                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1274                         }
1275                 } else {
1276                         $revdlink = '';
1277                 }
1278
1279                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1280         }
1281
1282         /**
1283          * Fetch revision text link if it's available to all users
1284          *
1285          * @param $rev Revision
1286          * @param $titleObj Title
1287          * @param $ts string Timestamp
1288          * @return string
1289          */
1290         function getPageLink( $rev, $titleObj, $ts ) {
1291                 $user = $this->getUser();
1292                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1293
1294                 if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1295                         return '<span class="history-deleted">' . $time . '</span>';
1296                 } else {
1297                         $link = Linker::linkKnown(
1298                                 $titleObj,
1299                                 htmlspecialchars( $time ),
1300                                 array(),
1301                                 array(
1302                                         'target' => $this->mTargetObj->getPrefixedText(),
1303                                         'timestamp' => $ts
1304                                 )
1305                         );
1306                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1307                                 $link = '<span class="history-deleted">' . $link . '</span>';
1308                         }
1309                         return $link;
1310                 }
1311         }
1312
1313         /**
1314          * Fetch image view link if it's available to all users
1315          *
1316          * @param $file File
1317          * @param $titleObj Title
1318          * @param $ts string A timestamp
1319          * @param $key String: a storage key
1320          *
1321          * @return String: HTML fragment
1322          */
1323         function getFileLink( $file, $titleObj, $ts, $key ) {
1324                 $user = $this->getUser();
1325                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1326
1327                 if( !$file->userCan( File::DELETED_FILE, $user ) ) {
1328                         return '<span class="history-deleted">' . $time . '</span>';
1329                 } else {
1330                         $link = Linker::linkKnown(
1331                                 $titleObj,
1332                                 htmlspecialchars( $time ),
1333                                 array(),
1334                                 array(
1335                                         'target' => $this->mTargetObj->getPrefixedText(),
1336                                         'file' => $key,
1337                                         'token' => $user->getEditToken( $key )
1338                                 )
1339                         );
1340                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1341                                 $link = '<span class="history-deleted">' . $link . '</span>';
1342                         }
1343                         return $link;
1344                 }
1345         }
1346
1347         /**
1348          * Fetch file's user id if it's available to this user
1349          *
1350          * @param $file File
1351          * @return String: HTML fragment
1352          */
1353         function getFileUser( $file ) {
1354                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1355                         return '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1356                 } else {
1357                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1358                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1359                         if( $file->isDeleted( File::DELETED_USER ) ) {
1360                                 $link = '<span class="history-deleted">' . $link . '</span>';
1361                         }
1362                         return $link;
1363                 }
1364         }
1365
1366         /**
1367          * Fetch file upload comment if it's available to this user
1368          *
1369          * @param $file File
1370          * @return String: HTML fragment
1371          */
1372         function getFileComment( $file ) {
1373                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1374                         return '<span class="history-deleted"><span class="comment">' .
1375                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1376                 } else {
1377                         $link = Linker::commentBlock( $file->getRawDescription() );
1378                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1379                                 $link = '<span class="history-deleted">' . $link . '</span>';
1380                         }
1381                         return $link;
1382                 }
1383         }
1384
1385         function undelete() {
1386                 global $wgUploadMaintenance;
1387
1388                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1389                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1390                 }
1391
1392                 if ( wfReadOnly() ) {
1393                         throw new ReadOnlyError;
1394                 }
1395
1396                 $out = $this->getOutput();
1397                 $archive = new PageArchive( $this->mTargetObj );
1398                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1399                 $ok = $archive->undelete(
1400                         $this->mTargetTimestamp,
1401                         $this->mComment,
1402                         $this->mFileVersions,
1403                         $this->mUnsuppress,
1404                         $this->getUser()
1405                 );
1406
1407                 if( is_array( $ok ) ) {
1408                         if ( $ok[1] ) { // Undeleted file count
1409                                 wfRunHooks( 'FileUndeleteComplete', array(
1410                                         $this->mTargetObj, $this->mFileVersions,
1411                                         $this->getUser(), $this->mComment ) );
1412                         }
1413
1414                         $link = Linker::linkKnown( $this->mTargetObj );
1415                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1416                 } else {
1417                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1418                         $out->addWikiMsg( 'cannotundelete' );
1419                         $out->addWikiMsg( 'undeleterevdel' );
1420                 }
1421
1422                 // Show file deletion warnings and errors
1423                 $status = $archive->getFileStatus();
1424                 if( $status && !$status->isGood() ) {
1425                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1426                 }
1427         }
1428 }