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(*) AS count'
  96                                 ),
  97                                 $condition,
  98                                 __METHOD__,
  99                                 array(
 100                                         'GROUP BY' => 'ar_namespace,ar_title',
 101                                         'ORDER BY' => '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          *
 325          * @return array(number of file revisions restored, number of image revisions restored, log message)
 326          * on success, false on failure
 327          */
 328         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 329                 // If both the set of text revisions and file revisions are empty,
 330                 // restore everything. Otherwise, just restore the requested items.
 331                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 332
 333                 $restoreText = $restoreAll || !empty( $timestamps );
 334                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 335
 336                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 337                         $img = wfLocalFile( $this->title );
 338                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 339                         if ( !$this->fileStatus->isOk() ) {
 340                                 return false;
 341                         }
 342                         $filesRestored = $this->fileStatus->successCount;
 343                 } else {
 344                         $filesRestored = 0;
 345                 }
 346
 347                 if( $restoreText ) {
 348                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 349                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 350                                 return false;
 351                         }
 352                 } else {
 353                         $textRestored = 0;
 354                 }
 355
 356                 // Touch the log!
 357                 global $wgContLang;
 358                 $log = new LogPage( 'delete' );
 359
 360                 if( $textRestored && $filesRestored ) {
 361                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 362                                 $wgContLang->formatNum( $textRestored ),
 363                                 $wgContLang->formatNum( $filesRestored ) );
 364                 } elseif( $textRestored ) {
 365                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 366                                 $wgContLang->formatNum( $textRestored ) );
 367                 } elseif( $filesRestored ) {
 368                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 369                                 $wgContLang->formatNum( $filesRestored ) );
 370                 } else {
 371                         wfDebug( "Undelete: nothing undeleted...\n" );
 372                         return false;
 373                 }
 374
 375                 if( trim( $comment ) != '' ) {
 376                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 377                 }
 378                 $log->addEntry( 'restore', $this->title, $reason );
 379
 380                 return array( $textRestored, $filesRestored, $reason );
 381         }
 382
 383         /**
 384          * This is the meaty bit -- restores archived revisions of the given page
 385          * to the cur/old tables. If the page currently exists, all revisions will
 386          * be stuffed into old, otherwise the most recent will go into cur.
 387          *
 388          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 389          * @param $comment String
 390          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 391          *
 392          * @return Mixed: number of revisions restored or false on failure
 393          */
 394         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 395                 if ( wfReadOnly() ) {
 396                         return false;
 397                 }
 398                 $restoreAll = empty( $timestamps );
 399
 400                 $dbw = wfGetDB( DB_MASTER );
 401
 402                 # Does this page already exist? We'll have to update it...
 403                 $article = WikiPage::factory( $this->title );
 404                 # Load latest data for the current page (bug 31179)
 405                 $article->loadPageData( 'fromdbmaster' );
 406                 $oldcountable = $article->isCountable();
 407
 408                 $options = 'FOR UPDATE'; // lock page
 409                 $page = $dbw->selectRow( 'page',
 410                         array( 'page_id', 'page_latest' ),
 411                         array( 'page_namespace' => $this->title->getNamespace(),
 412                                    'page_title'     => $this->title->getDBkey() ),
 413                         __METHOD__,
 414                         $options
 415                 );
 416                 if( $page ) {
 417                         $makepage = false;
 418                         # Page already exists. Import the history, and if necessary
 419                         # we'll update the latest revision field in the record.
 420                         $newid             = 0;
 421                         $pageId            = $page->page_id;
 422                         $previousRevId    = $page->page_latest;
 423                         # Get the time span of this page
 424                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 425                                 array( 'rev_id' => $previousRevId ),
 426                                 __METHOD__ );
 427                         if( $previousTimestamp === false ) {
 428                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 429                                 return 0;
 430                         }
 431                 } else {
 432                         # Have to create a new article...
 433                         $makepage = true;
 434                         $previousRevId = 0;
 435                         $previousTimestamp = 0;
 436                 }
 437
 438                 if( $restoreAll ) {
 439                         $oldones = '1 = 1'; # All revisions...
 440                 } else {
 441                         $oldts = implode( ',',
 442                                 array_map( array( &$dbw, 'addQuotes' ),
 443                                         array_map( array( &$dbw, 'timestamp' ),
 444                                                 $timestamps ) ) );
 445
 446                         $oldones = "ar_timestamp IN ( {$oldts} )";
 447                 }
 448
 449                 /**
 450                  * Select each archived revision...
 451                  */
 452                 $result = $dbw->select( 'archive',
 453                         /* fields */ array(
 454                                 'ar_rev_id',
 455                                 'ar_text',
 456                                 'ar_comment',
 457                                 'ar_user',
 458                                 'ar_user_text',
 459                                 'ar_timestamp',
 460                                 'ar_minor_edit',
 461                                 'ar_flags',
 462                                 'ar_text_id',
 463                                 'ar_deleted',
 464                                 'ar_page_id',
 465                                 'ar_len',
 466                                 'ar_sha1' ),
 467                         /* WHERE */ array(
 468                                 'ar_namespace' => $this->title->getNamespace(),
 469                                 'ar_title'     => $this->title->getDBkey(),
 470                                 $oldones ),
 471                         __METHOD__,
 472                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 473                 );
 474                 $ret = $dbw->resultObject( $result );
 475                 $rev_count = $dbw->numRows( $result );
 476                 if( !$rev_count ) {
 477                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 478                         return false; // ???
 479                 }
 480
 481                 $ret->seek( $rev_count - 1 ); // move to last
 482                 $row = $ret->fetchObject(); // get newest archived rev
 483                 $ret->seek( 0 ); // move back
 484
 485                 if( $makepage ) {
 486                         // Check the state of the newest to-be version...
 487                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 488                                 return false; // we can't leave the current revision like this!
 489                         }
 490                         // Safe to insert now...
 491                         $newid  = $article->insertOn( $dbw );
 492                         $pageId = $newid;
 493                 } else {
 494                         // Check if a deleted revision will become the current revision...
 495                         if( $row->ar_timestamp > $previousTimestamp ) {
 496                                 // Check the state of the newest to-be version...
 497                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 498                                         return false; // we can't leave the current revision like this!
 499                                 }
 500                         }
 501                 }
 502
 503                 $revision = null;
 504                 $restored = 0;
 505
 506                 foreach ( $ret as $row ) {
 507                         // Check for key dupes due to shitty archive integrity.
 508                         if( $row->ar_rev_id ) {
 509                                 $exists = $dbw->selectField( 'revision', '1',
 510                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 511                                 if( $exists ) {
 512                                         continue; // don't throw DB errors
 513                                 }
 514                         }
 515                         // Insert one revision at a time...maintaining deletion status
 516                         // unless we are specifically removing all restrictions...
 517                         $revision = Revision::newFromArchiveRow( $row,
 518                                 array(
 519                                         'page' => $pageId,
 520                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 521                                 ) );
 522
 523                         $revision->insertOn( $dbw );
 524                         $restored++;
 525
 526                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 527                 }
 528                 # Now that it's safely stored, take it out of the archive
 529                 $dbw->delete( 'archive',
 530                         /* WHERE */ array(
 531                                 'ar_namespace' => $this->title->getNamespace(),
 532                                 'ar_title' => $this->title->getDBkey(),
 533                                 $oldones ),
 534                         __METHOD__ );
 535
 536                 // Was anything restored at all?
 537                 if ( $restored == 0 ) {
 538                         return 0;
 539                 }
 540
 541                 $created = (bool)$newid;
 542
 543                 // Attach the latest revision to the page...
 544                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 545                 if ( $created || $wasnew ) {
 546                         // Update site stats, link tables, etc
 547                         $user = User::newFromName( $revision->getRawUserText(), false );
 548                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 549                 }
 550
 551                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 552
 553                 if( $this->title->getNamespace() == NS_FILE ) {
 554                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 555                         $update->doUpdate();
 556                 }
 557
 558                 return $restored;
 559         }
 560
 561         /**
 562          * @return Status
 563          */
 564         function getFileStatus() { return $this->fileStatus; }
 565 }
 566
 567 /**
 568  * Special page allowing users with the appropriate permissions to view
 569  * and restore deleted content.
 570  *
 571  * @ingroup SpecialPage
 572  */
 573 class SpecialUndelete extends SpecialPage {
 574         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 575         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 576
 577         /**
 578          * @var Title
 579          */
 580         var $mTargetObj;
 581
 582         function __construct() {
 583                 parent::__construct( 'Undelete', 'deletedhistory' );
 584         }
 585
 586         function loadRequest( $par ) {
 587                 $request = $this->getRequest();
 588                 $user = $this->getUser();
 589
 590                 $this->mAction = $request->getVal( 'action' );
 591                 if ( $par !== null && $par !== '' ) {
 592                         $this->mTarget = $par;
 593                 } else {
 594                         $this->mTarget = $request->getVal( 'target' );
 595                 }
 596                 $this->mTargetObj = null;
 597                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 598                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 599                 }
 600                 $this->mSearchPrefix = $request->getText( 'prefix' );
 601                 $time = $request->getVal( 'timestamp' );
 602                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 603                 $this->mFilename = $request->getVal( 'file' );
 604
 605                 $posted = $request->wasPosted() &&
 606                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 607                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 608                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 609                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 610                 $this->mDiff = $request->getCheck( 'diff' );
 611                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 612                 $this->mComment = $request->getText( 'wpComment' );
 613                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 614                 $this->mToken = $request->getVal( 'token' );
 615
 616                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 617                         $this->mAllowed = true; // user can restore
 618                         $this->mCanView = true; // user can view content
 619                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 620                         $this->mAllowed = false; // user cannot restore
 621                         $this->mCanView = true; // user can view content
 622                         $this->mRestore = false;
 623                 } else { // user can only view the list of revisions
 624                         $this->mAllowed = false;
 625                         $this->mCanView = false;
 626                         $this->mTimestamp = '';
 627                         $this->mRestore = false;
 628                 }
 629
 630                 if( $this->mRestore || $this->mInvert ) {
 631                         $timestamps = array();
 632                         $this->mFileVersions = array();
 633                         foreach( $request->getValues() as $key => $val ) {
 634                                 $matches = array();
 635                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 636                                         array_push( $timestamps, $matches[1] );
 637                                 }
 638
 639                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 640                                         $this->mFileVersions[] = intval( $matches[1] );
 641                                 }
 642                         }
 643                         rsort( $timestamps );
 644                         $this->mTargetTimestamp = $timestamps;
 645                 }
 646         }
 647
 648         function execute( $par ) {
 649                 $this->checkPermissions();
 650                 $user = $this->getUser();
 651
 652                 $this->setHeaders();
 653                 $this->outputHeader();
 654
 655                 $this->loadRequest( $par );
 656
 657                 $out = $this->getOutput();
 658
 659                 if ( is_null( $this->mTargetObj ) ) {
 660                         $out->addWikiMsg( 'undelete-header' );
 661
 662                         # Not all users can just browse every deleted page from the list
 663                         if ( $user->isAllowed( 'browsearchive' ) ) {
 664                                 $this->showSearchForm();
 665                         }
 666                         return;
 667                 }
 668
 669                 if ( $this->mAllowed ) {
 670                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 671                 } else {
 672                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 673                 }
 674
 675                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 676
 677                 if ( $this->mTimestamp !== '' ) {
 678                         $this->showRevision( $this->mTimestamp );
 679                 } elseif ( $this->mFilename !== null ) {
 680                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 681                         // Check if user is allowed to see this file
 682                         if ( !$file->exists() ) {
 683                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 684                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 685                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 686                                         throw new PermissionsError( 'suppressrevision' );
 687                                 } else {
 688                                         throw new PermissionsError( 'deletedtext' );
 689                                 }
 690                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 691                                 $this->showFileConfirmationForm( $this->mFilename );
 692                         } else {
 693                                 $this->showFile( $this->mFilename );
 694                         }
 695                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 696                         $this->undelete();
 697                 } else {
 698                         $this->showHistory();
 699                 }
 700         }
 701
 702         function showSearchForm() {
 703                 global $wgScript;
 704
 705                 $out = $this->getOutput();
 706                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 707                 $out->addHTML(
 708                         Xml::openElement( 'form', array(
 709                                 'method' => 'get',
 710                                 'action' => $wgScript ) ) .
 711                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 712                         Html::hidden( 'title',
 713                                 $this->getTitle()->getPrefixedDbKey() ) .
 714                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 715                                 'prefix', 'prefix', 20,
 716                                 $this->mSearchPrefix ) . ' ' .
 717                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 718                         Xml::closeElement( 'fieldset' ) .
 719                         Xml::closeElement( 'form' )
 720                 );
 721
 722                 # List undeletable articles
 723                 if( $this->mSearchPrefix ) {
 724                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 725                         $this->showList( $result );
 726                 }
 727         }
 728
 729         /**
 730          * Generic list of deleted pages
 731          *
 732          * @param $result ResultWrapper
 733          * @return bool
 734          */
 735         private function showList( $result ) {
 736                 $out = $this->getOutput();
 737
 738                 if( $result->numRows() == 0 ) {
 739                         $out->addWikiMsg( 'undelete-no-results' );
 740                         return;
 741                 }
 742
 743                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 744
 745                 $undelete = $this->getTitle();
 746                 $out->addHTML( "<ul>\n" );
 747                 foreach ( $result as $row ) {
 748                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 749                         $link = Linker::linkKnown(
 750                                 $undelete,
 751                                 htmlspecialchars( $title->getPrefixedText() ),
 752                                 array(),
 753                                 array( 'target' => $title->getPrefixedText() )
 754                         );
 755                         $revs = wfMsgExt( 'undeleterevisions',
 756                                 array( 'parseinline' ),
 757                                 $this->getLanguage()->formatNum( $row->count ) );
 758                         $out->addHTML( "<li>{$link} ({$revs})</li>\n" );
 759                 }
 760                 $result->free();
 761                 $out->addHTML( "</ul>\n" );
 762
 763                 return true;
 764         }
 765
 766         private function showRevision( $timestamp ) {
 767                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 768                         return 0;
 769                 }
 770
 771                 $archive = new PageArchive( $this->mTargetObj );
 772                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 773                 $rev = $archive->getRevision( $timestamp );
 774
 775                 $out = $this->getOutput();
 776                 $user = $this->getUser();
 777
 778                 if( !$rev ) {
 779                         $out->addWikiMsg( 'undeleterevision-missing' );
 780                         return;
 781                 }
 782
 783                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 784                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 785                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 786                                 return;
 787                         } else {
 788                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 789                                 $out->addHTML( '<br />' );
 790                                 // and we are allowed to see...
 791                         }
 792                 }
 793
 794                 if( $this->mDiff ) {
 795                         $previousRev = $archive->getPreviousRevision( $timestamp );
 796                         if( $previousRev ) {
 797                                 $this->showDiff( $previousRev, $rev );
 798                                 if( $this->mDiffOnly ) {
 799                                         return;
 800                                 } else {
 801                                         $out->addHTML( '<hr />' );
 802                                 }
 803                         } else {
 804                                 $out->addWikiMsg( 'undelete-nodiff' );
 805                         }
 806                 }
 807
 808                 $link = Linker::linkKnown(
 809                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 810                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 811                 );
 812
 813                 // date and time are separate parameters to facilitate localisation.
 814                 // $time is kept for backward compat reasons.
 815                 $time = $this->getLanguage()->timeAndDate( $timestamp, true );
 816                 $d = $this->getLanguage()->date( $timestamp, true );
 817                 $t = $this->getLanguage()->time( $timestamp, true );
 818                 $userLink = Linker::revUserTools( $rev );
 819
 820                 if( $this->mPreview ) {
 821                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 822                 } else {
 823                         $openDiv = '<div id="mw-undelete-revision">';
 824                 }
 825                 $out->addHTML( $openDiv );
 826
 827                 // Revision delete links
 828                 if ( !$this->mDiff ) {
 829                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 830                         if ( $revdel ) {
 831                                 $out->addHTML( "$revdel " );
 832                         }
 833                 }
 834
 835                 $out->addHTML( wfMessage( 'undelete-revision' )->rawParams( $link )->params(
 836                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 837                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 838
 839                 if( $this->mPreview ) {
 840                         // Hide [edit]s
 841                         $popts = $out->parserOptions();
 842                         $popts->setEditSection( false );
 843                         $out->parserOptions( $popts );
 844                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER, $user ), $this->mTargetObj, true );
 845                 }
 846
 847                 $out->addHTML(
 848                         Xml::element( 'textarea', array(
 849                                         'readonly' => 'readonly',
 850                                         'cols' => intval( $user->getOption( 'cols' ) ),
 851                                         'rows' => intval( $user->getOption( 'rows' ) ) ),
 852                                 $rev->getText( Revision::FOR_THIS_USER, $user ) . "\n" ) .
 853                         Xml::openElement( 'div' ) .
 854                         Xml::openElement( 'form', array(
 855                                 'method' => 'post',
 856                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 857                         Xml::element( 'input', array(
 858                                 'type' => 'hidden',
 859                                 'name' => 'target',
 860                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 861                         Xml::element( 'input', array(
 862                                 'type' => 'hidden',
 863                                 'name' => 'timestamp',
 864                                 'value' => $timestamp ) ) .
 865                         Xml::element( 'input', array(
 866                                 'type' => 'hidden',
 867                                 'name' => 'wpEditToken',
 868                                 'value' => $user->getEditToken() ) ) .
 869                         Xml::element( 'input', array(
 870                                 'type' => 'submit',
 871                                 'name' => 'preview',
 872                                 'value' => wfMsg( 'showpreview' ) ) ) .
 873                         Xml::element( 'input', array(
 874                                 'name' => 'diff',
 875                                 'type' => 'submit',
 876                                 'value' => wfMsg( 'showdiff' ) ) ) .
 877                         Xml::closeElement( 'form' ) .
 878                         Xml::closeElement( 'div' ) );
 879         }
 880
 881         /**
 882          * Build a diff display between this and the previous either deleted
 883          * or non-deleted edit.
 884          *
 885          * @param $previousRev Revision
 886          * @param $currentRev Revision
 887          * @return String: HTML
 888          */
 889         function showDiff( $previousRev, $currentRev ) {
 890                 $diffEngine = new DifferenceEngine( $this->getContext() );
 891                 $diffEngine->showDiffStyle();
 892                 $this->getOutput()->addHTML(
 893                         "<div>" .
 894                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 895                         "<col class='diff-marker' />" .
 896                         "<col class='diff-content' />" .
 897                         "<col class='diff-marker' />" .
 898                         "<col class='diff-content' />" .
 899                         "<tr>" .
 900                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 901                                 $this->diffHeader( $previousRev, 'o' ) .
 902                                 "</td>\n" .
 903                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 904                                 $this->diffHeader( $currentRev, 'n' ) .
 905                                 "</td>\n" .
 906                         "</tr>" .
 907                         $diffEngine->generateDiffBody(
 908                                 $previousRev->getText(), $currentRev->getText() ) .
 909                         "</table>" .
 910                         "</div>\n"
 911                 );
 912         }
 913
 914         /**
 915          * @param $rev Revision
 916          * @param $prefix
 917          * @return string
 918          */
 919         private function diffHeader( $rev, $prefix ) {
 920                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 921                 if( $isDeleted ) {
 922                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 923                         $targetPage = $this->getTitle();
 924                         $targetQuery = array(
 925                                 'target' => $this->mTargetObj->getPrefixedText(),
 926                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 927                         );
 928                 } else {
 929                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 930                         $targetPage = $rev->getTitle();
 931                         $targetQuery = array( 'oldid' => $rev->getId() );
 932                 }
 933                 // Add show/hide deletion links if available
 934                 $rdel = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
 935                 if ( $rdel ) $rdel = " $rdel";
 936                 return
 937                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 938                                 Linker::link(
 939                                         $targetPage,
 940                                         wfMsgExt(
 941                                                 'revisionasof',
 942                                                 array( 'escape' ),
 943                                                 $this->getLanguage()->timeanddate( $rev->getTimestamp(), true ),
 944                                                 $this->getLanguage()->date( $rev->getTimestamp(), true ),
 945                                                 $this->getLanguage()->time( $rev->getTimestamp(), true )
 946                                         ),
 947                                         array(),
 948                                         $targetQuery
 949                                 ) .
 950                         '</strong></div>' .
 951                         '<div id="mw-diff-'.$prefix.'title2">' .
 952                                 Linker::revUserTools( $rev ) . '<br />' .
 953                         '</div>' .
 954                         '<div id="mw-diff-'.$prefix.'title3">' .
 955                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 956                         '</div>';
 957         }
 958
 959         /**
 960          * Show a form confirming whether a tokenless user really wants to see a file
 961          */
 962         private function showFileConfirmationForm( $key ) {
 963                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 964                 $this->getOutput()->addWikiMsg( 'undelete-show-file-confirm',
 965                         $this->mTargetObj->getText(),
 966                         $this->getLanguage()->date( $file->getTimestamp() ),
 967                         $this->getLanguage()->time( $file->getTimestamp() ) );
 968                 $this->getOutput()->addHTML(
 969                         Xml::openElement( 'form', array(
 970                                 'method' => 'POST',
 971                                 'action' => $this->getTitle()->getLocalURL(
 972                                         'target=' . urlencode( $this->mTarget ) .
 973                                         '&file=' . urlencode( $key ) .
 974                                         '&token=' . urlencode( $this->getUser()->getEditToken( $key ) ) )
 975                                 )
 976                         ) .
 977                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
 978                         '</form>'
 979                 );
 980         }
 981
 982         /**
 983          * Show a deleted file version requested by the visitor.
 984          */
 985         private function showFile( $key ) {
 986                 $this->getOutput()->disable();
 987
 988                 # We mustn't allow the output to be Squid cached, otherwise
 989                 # if an admin previews a deleted image, and it's cached, then
 990                 # a user without appropriate permissions can toddle off and
 991                 # nab the image, and Squid will serve it
 992                 $response = $this->getRequest()->response();
 993                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 994                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 995                 $response->header( 'Pragma: no-cache' );
 996
 997                 $repo = RepoGroup::singleton()->getLocalRepo();
 998                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
 999                 StreamFile::stream( $path );
1000         }
1001
1002         private function showHistory() {
1003                 $out = $this->getOutput();
1004                 if( $this->mAllowed ) {
1005                         $out->addModules( 'mediawiki.special.undelete' );
1006                 }
1007                 $out->wrapWikiMsg(
1008                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1009                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1010                 );
1011
1012                 $archive = new PageArchive( $this->mTargetObj );
1013                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1014                 /*
1015                 $text = $archive->getLastRevisionText();
1016                 if( is_null( $text ) ) {
1017                         $out->addWikiMsg( 'nohistory' );
1018                         return;
1019                 }
1020                 */
1021                 $out->addHTML( '<div class="mw-undelete-history">' );
1022                 if ( $this->mAllowed ) {
1023                         $out->addWikiMsg( 'undeletehistory' );
1024                         $out->addWikiMsg( 'undeleterevdel' );
1025                 } else {
1026                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1027                 }
1028                 $out->addHTML( '</div>' );
1029
1030                 # List all stored revisions
1031                 $revisions = $archive->listRevisions();
1032                 $files = $archive->listFiles();
1033
1034                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1035                 $haveFiles = $files && $files->numRows() > 0;
1036
1037                 # Batch existence check on user and talk pages
1038                 if( $haveRevisions ) {
1039                         $batch = new LinkBatch();
1040                         foreach ( $revisions as $row ) {
1041                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1042                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1043                         }
1044                         $batch->execute();
1045                         $revisions->seek( 0 );
1046                 }
1047                 if( $haveFiles ) {
1048                         $batch = new LinkBatch();
1049                         foreach ( $files as $row ) {
1050                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1051                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1052                         }
1053                         $batch->execute();
1054                         $files->seek( 0 );
1055                 }
1056
1057                 if ( $this->mAllowed ) {
1058                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1059                         # Start the form here
1060                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1061                         $out->addHTML( $top );
1062                 }
1063
1064                 # Show relevant lines from the deletion log:
1065                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1066                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1067                 # Show relevant lines from the suppression log:
1068                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1069                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1070                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1071                 }
1072
1073                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1074                         # Format the user-visible controls (comment field, submission button)
1075                         # in a nice little table
1076                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1077                                 $unsuppressBox =
1078                                         "<tr>
1079                                                 <td>&#160;</td>
1080                                                 <td class='mw-input'>" .
1081                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1082                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1083                                                 "</td>
1084                                         </tr>";
1085                         } else {
1086                                 $unsuppressBox = '';
1087                         }
1088                         $table =
1089                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1090                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1091                                         "<tr>
1092                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1093                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1094                                                 "</td>
1095                                         </tr>
1096                                         <tr>
1097                                                 <td class='mw-label'>" .
1098                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1099                                                 "</td>
1100                                                 <td class='mw-input'>" .
1101                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1102                                                 "</td>
1103                                         </tr>
1104                                         <tr>
1105                                                 <td>&#160;</td>
1106                                                 <td class='mw-submit'>" .
1107                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1108                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1109                                                 "</td>
1110                                         </tr>" .
1111                                         $unsuppressBox .
1112                                 Xml::closeElement( 'table' ) .
1113                                 Xml::closeElement( 'fieldset' );
1114
1115                         $out->addHTML( $table );
1116                 }
1117
1118                 $out->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1119
1120                 if( $haveRevisions ) {
1121                         # The page's stored (deleted) history:
1122                         $out->addHTML( '<ul>' );
1123                         $remaining = $revisions->numRows();
1124                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1125
1126                         foreach ( $revisions as $row ) {
1127                                 $remaining--;
1128                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1129                         }
1130                         $revisions->free();
1131                         $out->addHTML( '</ul>' );
1132                 } else {
1133                         $out->addWikiMsg( 'nohistory' );
1134                 }
1135
1136                 if( $haveFiles ) {
1137                         $out->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1138                         $out->addHTML( '<ul>' );
1139                         foreach ( $files as $row ) {
1140                                 $out->addHTML( $this->formatFileRow( $row ) );
1141                         }
1142                         $files->free();
1143                         $out->addHTML( '</ul>' );
1144                 }
1145
1146                 if ( $this->mAllowed ) {
1147                         # Slip in the hidden controls here
1148                         $misc  = Html::hidden( 'target', $this->mTarget );
1149                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1150                         $misc .= Xml::closeElement( 'form' );
1151                         $out->addHTML( $misc );
1152                 }
1153
1154                 return true;
1155         }
1156
1157         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1158                 $rev = Revision::newFromArchiveRow( $row,
1159                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1160                 $stxt = '';
1161                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1162                 // Build checkboxen...
1163                 if( $this->mAllowed ) {
1164                         if( $this->mInvert ) {
1165                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1166                                         $checkBox = Xml::check( "ts$ts" );
1167                                 } else {
1168                                         $checkBox = Xml::check( "ts$ts", true );
1169                                 }
1170                         } else {
1171                                 $checkBox = Xml::check( "ts$ts" );
1172                         }
1173                 } else {
1174                         $checkBox = '';
1175                 }
1176                 // Build page & diff links...
1177                 if( $this->mCanView ) {
1178                         $titleObj = $this->getTitle();
1179                         # Last link
1180                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1181                                 $pageLink = htmlspecialchars( $this->getLanguage()->timeanddate( $ts, true ) );
1182                                 $last = wfMsgHtml( 'diff' );
1183                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1184                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1185                                 $last = Linker::linkKnown(
1186                                         $titleObj,
1187                                         wfMsgHtml( 'diff' ),
1188                                         array(),
1189                                         array(
1190                                                 'target' => $this->mTargetObj->getPrefixedText(),
1191                                                 'timestamp' => $ts,
1192                                                 'diff' => 'prev'
1193                                         )
1194                                 );
1195                         } else {
1196                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1197                                 $last = wfMsgHtml( 'diff' );
1198                         }
1199                 } else {
1200                         $pageLink = htmlspecialchars( $this->getLanguage()->timeanddate( $ts, true ) );
1201                         $last = wfMsgHtml( 'diff' );
1202                 }
1203                 // User links
1204                 $userLink = Linker::revUserTools( $rev );
1205                 // Revision text size
1206                 $size = $row->ar_len;
1207                 if( !is_null( $size ) ) {
1208                         $stxt = Linker::formatRevisionSize( $size );
1209                 }
1210                 // Edit summary
1211                 $comment = Linker::revComment( $rev );
1212                 // Revision delete links
1213                 $revdlink = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
1214                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1215         }
1216
1217         private function formatFileRow( $row ) {
1218                 $file = ArchivedFile::newFromRow( $row );
1219
1220                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1221                 if( $this->mAllowed && $row->fa_storage_key ) {
1222                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1223                         $key = urlencode( $row->fa_storage_key );
1224                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1225                 } else {
1226                         $checkBox = '';
1227                         $pageLink = $this->getLanguage()->timeanddate( $ts, true );
1228                 }
1229                 $userLink = $this->getFileUser( $file );
1230                 $data =
1231                         wfMsg( 'widthheight',
1232                                 $this->getLanguage()->formatNum( $row->fa_width ),
1233                                 $this->getLanguage()->formatNum( $row->fa_height ) ) .
1234                         ' (' .
1235                         wfMsg( 'nbytes', $this->getLanguage()->formatNum( $row->fa_size ) ) .
1236                         ')';
1237                 $data = htmlspecialchars( $data );
1238                 $comment = $this->getFileComment( $file );
1239
1240                 // Add show/hide deletion links if available
1241                 $user = $this->getUser();
1242                 $canHide = $user->isAllowed( 'deleterevision' );
1243                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1244                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1245                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1246                         } else {
1247                                 $query = array(
1248                                         'type' => 'filearchive',
1249                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1250                                         'ids' => $row->fa_id
1251                                 );
1252                                 $revdlink = Linker::revDeleteLink( $query,
1253                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1254                         }
1255                 } else {
1256                         $revdlink = '';
1257                 }
1258
1259                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1260         }
1261
1262         /**
1263          * Fetch revision text link if it's available to all users
1264          *
1265          * @param $rev Revision
1266          * @return string
1267          */
1268         function getPageLink( $rev, $titleObj, $ts ) {
1269                 $time = htmlspecialchars( $this->getLanguage()->timeanddate( $ts, true ) );
1270
1271                 if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1272                         return '<span class="history-deleted">' . $time . '</span>';
1273                 } else {
1274                         $link = Linker::linkKnown(
1275                                 $titleObj,
1276                                 $time,
1277                                 array(),
1278                                 array(
1279                                         'target' => $this->mTargetObj->getPrefixedText(),
1280                                         'timestamp' => $ts
1281                                 )
1282                         );
1283                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1284                                 $link = '<span class="history-deleted">' . $link . '</span>';
1285                         }
1286                         return $link;
1287                 }
1288         }
1289
1290         /**
1291          * Fetch image view link if it's available to all users
1292          *
1293          * @param $file File
1294          * @return String: HTML fragment
1295          */
1296         function getFileLink( $file, $titleObj, $ts, $key ) {
1297                 if( !$file->userCan( File::DELETED_FILE, $this->getUser() ) ) {
1298                         return '<span class="history-deleted">' . $this->getLanguage()->timeanddate( $ts, true ) . '</span>';
1299                 } else {
1300                         $link = Linker::linkKnown(
1301                                 $titleObj,
1302                                 $this->getLanguage()->timeanddate( $ts, true ),
1303                                 array(),
1304                                 array(
1305                                         'target' => $this->mTargetObj->getPrefixedText(),
1306                                         'file' => $key,
1307                                         'token' => $this->getUser()->getEditToken( $key )
1308                                 )
1309                         );
1310                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1311                                 $link = '<span class="history-deleted">' . $link . '</span>';
1312                         }
1313                         return $link;
1314                 }
1315         }
1316
1317         /**
1318          * Fetch file's user id if it's available to this user
1319          *
1320          * @param $file File
1321          * @return String: HTML fragment
1322          */
1323         function getFileUser( $file ) {
1324                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1325                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1326                 } else {
1327                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1328                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1329                         if( $file->isDeleted( File::DELETED_USER ) ) {
1330                                 $link = '<span class="history-deleted">' . $link . '</span>';
1331                         }
1332                         return $link;
1333                 }
1334         }
1335
1336         /**
1337          * Fetch file upload comment if it's available to this user
1338          *
1339          * @param $file File
1340          * @return String: HTML fragment
1341          */
1342         function getFileComment( $file ) {
1343                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1344                         return '<span class="history-deleted"><span class="comment">' .
1345                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1346                 } else {
1347                         $link = Linker::commentBlock( $file->getRawDescription() );
1348                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1349                                 $link = '<span class="history-deleted">' . $link . '</span>';
1350                         }
1351                         return $link;
1352                 }
1353         }
1354
1355         function undelete() {
1356                 global $wgUploadMaintenance;
1357
1358                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1359                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1360                 }
1361
1362                 if ( wfReadOnly() ) {
1363                         throw new ReadOnlyError;
1364                 }
1365
1366                 $out = $this->getOutput();
1367                 $archive = new PageArchive( $this->mTargetObj );
1368                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1369                 $ok = $archive->undelete(
1370                         $this->mTargetTimestamp,
1371                         $this->mComment,
1372                         $this->mFileVersions,
1373                         $this->mUnsuppress );
1374
1375                 if( is_array( $ok ) ) {
1376                         if ( $ok[1] ) { // Undeleted file count
1377                                 wfRunHooks( 'FileUndeleteComplete', array(
1378                                         $this->mTargetObj, $this->mFileVersions,
1379                                         $this->getUser(), $this->mComment ) );
1380                         }
1381
1382                         $link = Linker::linkKnown( $this->mTargetObj );
1383                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1384                 } else {
1385                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1386                         $out->addWikiMsg( 'cannotundelete' );
1387                         $out->addWikiMsg( 'undeleterevdel' );
1388                 }
1389
1390                 // Show file deletion warnings and errors
1391                 $status = $archive->getFileStatus();
1392                 if( $status && !$status->isGood() ) {
1393                         $out->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1394                 }
1395         }
1396 }