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                 'ar_content_format', 'ar_content_model'
 121                         ),
 122                         array( 'ar_namespace' => $this->title->getNamespace(),
 123                                    'ar_title' => $this->title->getDBkey() ),
 124                         'PageArchive::listRevisions',
 125                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 126                 $ret = $dbr->resultObject( $res );
 127                 return $ret;
 128         }
 129
 130         /**
 131          * List the deleted file revisions for this page, if it's a file page.
 132          * Returns a result wrapper with various filearchive fields, or null
 133          * if not a file page.
 134          *
 135          * @return ResultWrapper
 136          * @todo Does this belong in Image for fuller encapsulation?
 137          */
 138         function listFiles() {
 139                 if( $this->title->getNamespace() == NS_FILE ) {
 140                         $dbr = wfGetDB( DB_SLAVE );
 141                         $res = $dbr->select( 'filearchive',
 142                                 array(
 143                                         'fa_id',
 144                                         'fa_name',
 145                                         'fa_archive_name',
 146                                         'fa_storage_key',
 147                                         'fa_storage_group',
 148                                         'fa_size',
 149                                         'fa_width',
 150                                         'fa_height',
 151                                         'fa_bits',
 152                                         'fa_metadata',
 153                                         'fa_media_type',
 154                                         'fa_major_mime',
 155                                         'fa_minor_mime',
 156                                         'fa_description',
 157                                         'fa_user',
 158                                         'fa_user_text',
 159                                         'fa_timestamp',
 160                                         'fa_deleted' ),
 161                                 array( 'fa_name' => $this->title->getDBkey() ),
 162                                 __METHOD__,
 163                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 164                         $ret = $dbr->resultObject( $res );
 165                         return $ret;
 166                 }
 167                 return null;
 168         }
 169
 170         /**
 171          * Return a Revision object containing data for the deleted revision.
 172          * Note that the result *may* or *may not* have a null page ID.
 173          *
 174          * @param $timestamp String
 175          * @return Revision
 176          */
 177         function getRevision( $timestamp ) {
 178                 $dbr = wfGetDB( DB_SLAVE );
 179                 $row = $dbr->selectRow( 'archive',
 180                         array(
 181                                 'ar_rev_id',
 182                                 'ar_text',
 183                                 'ar_comment',
 184                                 'ar_user',
 185                                 'ar_user_text',
 186                                 'ar_timestamp',
 187                                 'ar_minor_edit',
 188                                 'ar_flags',
 189                                 'ar_text_id',
 190                                 'ar_deleted',
 191                                 'ar_len',
 192                                 'ar_sha1',
 193                 'ar_content_format',
 194                 'ar_content_model',
 195                         ),
 196                         array( 'ar_namespace' => $this->title->getNamespace(),
 197                                         'ar_title' => $this->title->getDBkey(),
 198                                         'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 199                         __METHOD__ );
 200                 if( $row ) {
 201                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleID() ) );
 202                 } else {
 203                         return null;
 204                 }
 205         }
 206
 207         /**
 208          * Return the most-previous revision, either live or deleted, against
 209          * the deleted revision given by timestamp.
 210          *
 211          * May produce unexpected results in case of history merges or other
 212          * unusual time issues.
 213          *
 214          * @param $timestamp String
 215          * @return Revision or null
 216          */
 217         function getPreviousRevision( $timestamp ) {
 218                 $dbr = wfGetDB( DB_SLAVE );
 219
 220                 // Check the previous deleted revision...
 221                 $row = $dbr->selectRow( 'archive',
 222                         'ar_timestamp',
 223                         array( 'ar_namespace' => $this->title->getNamespace(),
 224                                    'ar_title' => $this->title->getDBkey(),
 225                                    'ar_timestamp < ' .
 226                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 227                         __METHOD__,
 228                         array(
 229                                 'ORDER BY' => 'ar_timestamp DESC',
 230                                 'LIMIT' => 1 ) );
 231                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 232
 233                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 234                         array( 'rev_id', 'rev_timestamp' ),
 235                         array(
 236                                 'page_namespace' => $this->title->getNamespace(),
 237                                 'page_title' => $this->title->getDBkey(),
 238                                 'page_id = rev_page',
 239                                 'rev_timestamp < ' .
 240                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 241                         __METHOD__,
 242                         array(
 243                                 'ORDER BY' => 'rev_timestamp DESC',
 244                                 'LIMIT' => 1 ) );
 245                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 246                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 247
 248                 if( $prevLive && $prevLive > $prevDeleted ) {
 249                         // Most prior revision was live
 250                         return Revision::newFromId( $prevLiveId );
 251                 } elseif( $prevDeleted ) {
 252                         // Most prior revision was deleted
 253                         return $this->getRevision( $prevDeleted );
 254                 } else {
 255                         // No prior revision on this page.
 256                         return null;
 257                 }
 258         }
 259
 260         /**
 261          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 262          *
 263          * @param $row Object: database row
 264          * @return Revision
 265          */
 266         function getTextFromRow( $row ) {
 267                 if( is_null( $row->ar_text_id ) ) {
 268                         // An old row from MediaWiki 1.4 or previous.
 269                         // Text is embedded in this row in classic compression format.
 270                         return Revision::getRevisionText( $row, 'ar_' );
 271                 } else {
 272                         // New-style: keyed to the text storage backend.
 273                         $dbr = wfGetDB( DB_SLAVE );
 274                         $text = $dbr->selectRow( 'text',
 275                                 array( 'old_text', 'old_flags' ),
 276                                 array( 'old_id' => $row->ar_text_id ),
 277                                 __METHOD__ );
 278                         return Revision::getRevisionText( $text );
 279                 }
 280         }
 281
 282         /**
 283          * Fetch (and decompress if necessary) the stored text of the most
 284          * recently edited deleted revision of the page.
 285          *
 286          * If there are no archived revisions for the page, returns NULL.
 287          *
 288          * @return String
 289          */
 290         function getLastRevisionText() {
 291                 $dbr = wfGetDB( DB_SLAVE );
 292                 $row = $dbr->selectRow( 'archive',
 293                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 294                         array( 'ar_namespace' => $this->title->getNamespace(),
 295                                    'ar_title' => $this->title->getDBkey() ),
 296                         __METHOD__,
 297                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 298                 if( $row ) {
 299                         return $this->getTextFromRow( $row );
 300                 } else {
 301                         return null;
 302                 }
 303         }
 304
 305         /**
 306          * Quick check if any archived revisions are present for the page.
 307          *
 308          * @return Boolean
 309          */
 310         function isDeleted() {
 311                 $dbr = wfGetDB( DB_SLAVE );
 312                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 313                         array( 'ar_namespace' => $this->title->getNamespace(),
 314                                    'ar_title' => $this->title->getDBkey() ) );
 315                 return ( $n > 0 );
 316         }
 317
 318         /**
 319          * Restore the given (or all) text and file revisions for the page.
 320          * Once restored, the items will be removed from the archive tables.
 321          * The deletion log will be updated with an undeletion notice.
 322          *
 323          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 324          * @param $comment String
 325          * @param $fileVersions Array
 326          * @param $unsuppress Boolean
 327          *
 328          * @return array(number of file revisions restored, number of image revisions restored, log message)
 329          * on success, false on failure
 330          */
 331         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 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                 global $wgContLang;
 361                 $log = new LogPage( 'delete' );
 362
 363                 if( $textRestored && $filesRestored ) {
 364                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 365                                 $wgContLang->formatNum( $textRestored ),
 366                                 $wgContLang->formatNum( $filesRestored ) );
 367                 } elseif( $textRestored ) {
 368                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 369                                 $wgContLang->formatNum( $textRestored ) );
 370                 } elseif( $filesRestored ) {
 371                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 372                                 $wgContLang->formatNum( $filesRestored ) );
 373                 } else {
 374                         wfDebug( "Undelete: nothing undeleted...\n" );
 375                         return false;
 376                 }
 377
 378                 if( trim( $comment ) != '' ) {
 379                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 380                 }
 381                 $log->addEntry( 'restore', $this->title, $reason );
 382
 383                 return array( $textRestored, $filesRestored, $reason );
 384         }
 385
 386         /**
 387          * This is the meaty bit -- restores archived revisions of the given page
 388          * to the cur/old tables. If the page currently exists, all revisions will
 389          * be stuffed into old, otherwise the most recent will go into cur.
 390          *
 391          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 392          * @param $comment String
 393          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 394          *
 395          * @return Mixed: number of revisions restored or false on failure
 396          */
 397         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 398                 if ( wfReadOnly() ) {
 399                         return false;
 400                 }
 401                 $restoreAll = empty( $timestamps );
 402
 403                 $dbw = wfGetDB( DB_MASTER );
 404
 405                 # Does this page already exist? We'll have to update it...
 406                 $article = WikiPage::factory( $this->title );
 407                 # Load latest data for the current page (bug 31179)
 408                 $article->loadPageData( 'fromdbmaster' );
 409                 $oldcountable = $article->isCountable();
 410
 411                 $page = $dbw->selectRow( 'page',
 412                         array( 'page_id', 'page_latest' ),
 413                         array( 'page_namespace' => $this->title->getNamespace(),
 414                                    'page_title'     => $this->title->getDBkey() ),
 415                         __METHOD__,
 416                         array( 'FOR UPDATE' ) // lock page
 417                 );
 418                 if( $page ) {
 419                         $makepage = false;
 420                         # Page already exists. Import the history, and if necessary
 421                         # we'll update the latest revision field in the record.
 422                         $newid             = 0;
 423                         $pageId            = $page->page_id;
 424                         $previousRevId    = $page->page_latest;
 425                         # Get the time span of this page
 426                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 427                                 array( 'rev_id' => $previousRevId ),
 428                                 __METHOD__ );
 429                         if( $previousTimestamp === false ) {
 430                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 431                                 return 0;
 432                         }
 433                 } else {
 434                         # Have to create a new article...
 435                         $makepage = true;
 436                         $previousRevId = 0;
 437                         $previousTimestamp = 0;
 438                 }
 439
 440                 if( $restoreAll ) {
 441                         $oldones = '1 = 1'; # All revisions...
 442                 } else {
 443                         $oldts = implode( ',',
 444                                 array_map( array( &$dbw, 'addQuotes' ),
 445                                         array_map( array( &$dbw, 'timestamp' ),
 446                                                 $timestamps ) ) );
 447
 448                         $oldones = "ar_timestamp IN ( {$oldts} )";
 449                 }
 450
 451                 /**
 452                  * Select each archived revision...
 453                  */
 454                 $result = $dbw->select( 'archive',
 455                         /* fields */ array(
 456                                 'ar_rev_id',
 457                                 'ar_text',
 458                                 'ar_comment',
 459                                 'ar_user',
 460                                 'ar_user_text',
 461                                 'ar_timestamp',
 462                                 'ar_minor_edit',
 463                                 'ar_flags',
 464                                 'ar_text_id',
 465                                 'ar_deleted',
 466                                 'ar_page_id',
 467                                 'ar_len',
 468                                 'ar_sha1',
 469                 'ar_content_format',
 470                 'ar_content_model' ),
 471                         /* WHERE */ array(
 472                                 'ar_namespace' => $this->title->getNamespace(),
 473                                 'ar_title'     => $this->title->getDBkey(),
 474                                 $oldones ),
 475                         __METHOD__,
 476                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 477                 );
 478                 $ret = $dbw->resultObject( $result );
 479                 $rev_count = $dbw->numRows( $result );
 480                 if( !$rev_count ) {
 481                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 482                         return false; // ???
 483                 }
 484
 485                 $ret->seek( $rev_count - 1 ); // move to last
 486                 $row = $ret->fetchObject(); // get newest archived rev
 487                 $ret->seek( 0 ); // move back
 488
 489                 if( $makepage ) {
 490                         // Check the state of the newest to-be version...
 491                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 492                                 return false; // we can't leave the current revision like this!
 493                         }
 494                         // Safe to insert now...
 495                         $newid  = $article->insertOn( $dbw );
 496                         $pageId = $newid;
 497                 } else {
 498                         // Check if a deleted revision will become the current revision...
 499                         if( $row->ar_timestamp > $previousTimestamp ) {
 500                                 // Check the state of the newest to-be version...
 501                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 502                                         return false; // we can't leave the current revision like this!
 503                                 }
 504                         }
 505                 }
 506
 507                 $revision = null;
 508                 $restored = 0;
 509
 510                 foreach ( $ret as $row ) {
 511                         // Check for key dupes due to shitty archive integrity.
 512                         if( $row->ar_rev_id ) {
 513                                 $exists = $dbw->selectField( 'revision', '1',
 514                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 515                                 if( $exists ) {
 516                                         continue; // don't throw DB errors
 517                                 }
 518                         }
 519                         // Insert one revision at a time...maintaining deletion status
 520                         // unless we are specifically removing all restrictions...
 521                         $revision = Revision::newFromArchiveRow( $row,
 522                                 array(
 523                                         'page' => $pageId,
 524                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 525                                 ) );
 526
 527                         $revision->insertOn( $dbw );
 528                         $restored++;
 529
 530                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 531                 }
 532                 # Now that it's safely stored, take it out of the archive
 533                 $dbw->delete( 'archive',
 534                         /* WHERE */ array(
 535                                 'ar_namespace' => $this->title->getNamespace(),
 536                                 'ar_title' => $this->title->getDBkey(),
 537                                 $oldones ),
 538                         __METHOD__ );
 539
 540                 // Was anything restored at all?
 541                 if ( $restored == 0 ) {
 542                         return 0;
 543                 }
 544
 545                 $created = (bool)$newid;
 546
 547                 // Attach the latest revision to the page...
 548                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 549                 if ( $created || $wasnew ) {
 550                         // Update site stats, link tables, etc
 551                         $user = User::newFromName( $revision->getRawUserText(), false );
 552                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 553                 }
 554
 555                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 556
 557                 if( $this->title->getNamespace() == NS_FILE ) {
 558                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 559                         $update->doUpdate();
 560                 }
 561
 562                 return $restored;
 563         }
 564
 565         /**
 566          * @return Status
 567          */
 568         function getFileStatus() { return $this->fileStatus; }
 569 }
 570
 571 /**
 572  * Special page allowing users with the appropriate permissions to view
 573  * and restore deleted content.
 574  *
 575  * @ingroup SpecialPage
 576  */
 577 class SpecialUndelete extends SpecialPage {
 578         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 579         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 580
 581         /**
 582          * @var Title
 583          */
 584         var $mTargetObj;
 585
 586         function __construct() {
 587                 parent::__construct( 'Undelete', 'deletedhistory' );
 588         }
 589
 590         function loadRequest( $par ) {
 591                 $request = $this->getRequest();
 592                 $user = $this->getUser();
 593
 594                 $this->mAction = $request->getVal( 'action' );
 595                 if ( $par !== null && $par !== '' ) {
 596                         $this->mTarget = $par;
 597                 } else {
 598                         $this->mTarget = $request->getVal( 'target' );
 599                 }
 600                 $this->mTargetObj = null;
 601                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 602                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 603                 }
 604                 $this->mSearchPrefix = $request->getText( 'prefix' );
 605                 $time = $request->getVal( 'timestamp' );
 606                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 607                 $this->mFilename = $request->getVal( 'file' );
 608
 609                 $posted = $request->wasPosted() &&
 610                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 611                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 612                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 613                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 614                 $this->mDiff = $request->getCheck( 'diff' );
 615                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 616                 $this->mComment = $request->getText( 'wpComment' );
 617                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 618                 $this->mToken = $request->getVal( 'token' );
 619
 620                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 621                         $this->mAllowed = true; // user can restore
 622                         $this->mCanView = true; // user can view content
 623                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 624                         $this->mAllowed = false; // user cannot restore
 625                         $this->mCanView = true; // user can view content
 626                         $this->mRestore = false;
 627                 } else { // user can only view the list of revisions
 628                         $this->mAllowed = false;
 629                         $this->mCanView = false;
 630                         $this->mTimestamp = '';
 631                         $this->mRestore = false;
 632                 }
 633
 634                 if( $this->mRestore || $this->mInvert ) {
 635                         $timestamps = array();
 636                         $this->mFileVersions = array();
 637                         foreach( $request->getValues() as $key => $val ) {
 638                                 $matches = array();
 639                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 640                                         array_push( $timestamps, $matches[1] );
 641                                 }
 642
 643                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 644                                         $this->mFileVersions[] = intval( $matches[1] );
 645                                 }
 646                         }
 647                         rsort( $timestamps );
 648                         $this->mTargetTimestamp = $timestamps;
 649                 }
 650         }
 651
 652         function execute( $par ) {
 653                 $this->checkPermissions();
 654                 $user = $this->getUser();
 655
 656                 $this->setHeaders();
 657                 $this->outputHeader();
 658
 659                 $this->loadRequest( $par );
 660
 661                 $out = $this->getOutput();
 662
 663                 if ( is_null( $this->mTargetObj ) ) {
 664                         $out->addWikiMsg( 'undelete-header' );
 665
 666                         # Not all users can just browse every deleted page from the list
 667                         if ( $user->isAllowed( 'browsearchive' ) ) {
 668                                 $this->showSearchForm();
 669                         }
 670                         return;
 671                 }
 672
 673                 if ( $this->mAllowed ) {
 674                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 675                 } else {
 676                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 677                 }
 678
 679                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 680
 681                 if ( $this->mTimestamp !== '' ) {
 682                         $this->showRevision( $this->mTimestamp );
 683                 } elseif ( $this->mFilename !== null ) {
 684                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 685                         // Check if user is allowed to see this file
 686                         if ( !$file->exists() ) {
 687                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 688                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 689                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 690                                         throw new PermissionsError( 'suppressrevision' );
 691                                 } else {
 692                                         throw new PermissionsError( 'deletedtext' );
 693                                 }
 694                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 695                                 $this->showFileConfirmationForm( $this->mFilename );
 696                         } else {
 697                                 $this->showFile( $this->mFilename );
 698                         }
 699                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 700                         $this->undelete();
 701                 } else {
 702                         $this->showHistory();
 703                 }
 704         }
 705
 706         function showSearchForm() {
 707                 global $wgScript;
 708
 709                 $out = $this->getOutput();
 710                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 711                 $out->addHTML(
 712                         Xml::openElement( 'form', array(
 713                                 'method' => 'get',
 714                                 'action' => $wgScript ) ) .
 715                         Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 716                         Html::hidden( 'title',
 717                                 $this->getTitle()->getPrefixedDbKey() ) .
 718                         Xml::inputLabel( $this->msg( 'undelete-search-prefix' )->text(),
 719                                 'prefix', 'prefix', 20,
 720                                 $this->mSearchPrefix ) . ' ' .
 721                         Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 722                         Xml::closeElement( 'fieldset' ) .
 723                         Xml::closeElement( 'form' )
 724                 );
 725
 726                 # List undeletable articles
 727                 if( $this->mSearchPrefix ) {
 728                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 729                         $this->showList( $result );
 730                 }
 731         }
 732
 733         /**
 734          * Generic list of deleted pages
 735          *
 736          * @param $result ResultWrapper
 737          * @return bool
 738          */
 739         private function showList( $result ) {
 740                 $out = $this->getOutput();
 741
 742                 if( $result->numRows() == 0 ) {
 743                         $out->addWikiMsg( 'undelete-no-results' );
 744                         return;
 745                 }
 746
 747                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 748
 749                 $undelete = $this->getTitle();
 750                 $out->addHTML( "<ul>\n" );
 751                 foreach ( $result as $row ) {
 752                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 753                         if ( $title !== null ) {
 754                                 $item = Linker::linkKnown(
 755                                         $undelete,
 756                                         htmlspecialchars( $title->getPrefixedText() ),
 757                                         array(),
 758                                         array( 'target' => $title->getPrefixedText() )
 759                                 );
 760                         } else {
 761                                 // The title is no longer valid, show as text
 762                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 763                                 $item = htmlspecialchars( $title->getPrefixedText() );
 764                         }
 765                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 766                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 767                 }
 768                 $result->free();
 769                 $out->addHTML( "</ul>\n" );
 770
 771                 return true;
 772         }
 773
 774         private function showRevision( $timestamp ) {
 775                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 776                         return 0;
 777                 }
 778
 779                 $archive = new PageArchive( $this->mTargetObj );
 780                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 781                 $rev = $archive->getRevision( $timestamp );
 782
 783                 $out = $this->getOutput();
 784                 $user = $this->getUser();
 785
 786                 if( !$rev ) {
 787                         $out->addWikiMsg( 'undeleterevision-missing' );
 788                         return;
 789                 }
 790
 791                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 792                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 793                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 794                                 return;
 795                         } else {
 796                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 797                                 $out->addHTML( '<br />' );
 798                                 // and we are allowed to see...
 799                         }
 800                 }
 801
 802                 if( $this->mDiff ) {
 803                         $previousRev = $archive->getPreviousRevision( $timestamp );
 804                         if( $previousRev ) {
 805                                 $this->showDiff( $previousRev, $rev );
 806                                 if( $this->mDiffOnly ) {
 807                                         return;
 808                                 } else {
 809                                         $out->addHTML( '<hr />' );
 810                                 }
 811                         } else {
 812                                 $out->addWikiMsg( 'undelete-nodiff' );
 813                         }
 814                 }
 815
 816                 $link = Linker::linkKnown(
 817                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 818                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 819                 );
 820
 821                 $lang = $this->getLanguage();
 822
 823                 // date and time are separate parameters to facilitate localisation.
 824                 // $time is kept for backward compat reasons.
 825                 $time = $lang->userTimeAndDate( $timestamp, $user );
 826                 $d = $lang->userDate( $timestamp, $user );
 827                 $t = $lang->userTime( $timestamp, $user );
 828                 $userLink = Linker::revUserTools( $rev );
 829
 830                 if( $this->mPreview ) {
 831                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 832                 } else {
 833                         $openDiv = '<div id="mw-undelete-revision">';
 834                 }
 835                 $out->addHTML( $openDiv );
 836
 837                 // Revision delete links
 838                 if ( !$this->mDiff ) {
 839                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 840                         if ( $revdel ) {
 841                                 $out->addHTML( "$revdel " );
 842                         }
 843                 }
 844
 845                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 846                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 847                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 848
 849                 if( $this->mPreview ) {
 850                         // Hide [edit]s
 851                         $popts = $out->parserOptions();
 852                         $popts->setEditSection( false );
 853                         $out->parserOptions( $popts );
 854                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER, $user ), $this->mTargetObj, true );
 855                 }
 856
 857                 $out->addHTML(
 858                         Xml::element( 'textarea', array(
 859                                         'readonly' => 'readonly',
 860                                         'cols' => intval( $user->getOption( 'cols' ) ),
 861                                         'rows' => intval( $user->getOption( 'rows' ) ) ),
 862                                 $rev->getText( Revision::FOR_THIS_USER, $user ) . "\n" ) .
 863                         Xml::openElement( 'div' ) .
 864                         Xml::openElement( 'form', array(
 865                                 'method' => 'post',
 866                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 867                         Xml::element( 'input', array(
 868                                 'type' => 'hidden',
 869                                 'name' => 'target',
 870                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 871                         Xml::element( 'input', array(
 872                                 'type' => 'hidden',
 873                                 'name' => 'timestamp',
 874                                 'value' => $timestamp ) ) .
 875                         Xml::element( 'input', array(
 876                                 'type' => 'hidden',
 877                                 'name' => 'wpEditToken',
 878                                 'value' => $user->getEditToken() ) ) .
 879                         Xml::element( 'input', array(
 880                                 'type' => 'submit',
 881                                 'name' => 'preview',
 882                                 'value' => $this->msg( 'showpreview' )->text() ) ) .
 883                         Xml::element( 'input', array(
 884                                 'name' => 'diff',
 885                                 'type' => 'submit',
 886                                 'value' => $this->msg( 'showdiff' )->text() ) ) .
 887                         Xml::closeElement( 'form' ) .
 888                         Xml::closeElement( 'div' ) );
 889         }
 890
 891         /**
 892          * Build a diff display between this and the previous either deleted
 893          * or non-deleted edit.
 894          *
 895          * @param $previousRev Revision
 896          * @param $currentRev Revision
 897          * @return String: HTML
 898          */
 899         function showDiff( $previousRev, $currentRev ) {
 900         $contentHandler = ContentHandler::getForTitle( $this->getTitle() );
 901                 $diffEngine = $contentHandler->getDifferenceEngine( $this->getContext() );
 902                 $diffEngine->showDiffStyle();
 903                 $this->getOutput()->addHTML(
 904                         "<div>" .
 905                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 906                         "<col class='diff-marker' />" .
 907                         "<col class='diff-content' />" .
 908                         "<col class='diff-marker' />" .
 909                         "<col class='diff-content' />" .
 910                         "<tr>" .
 911                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 912                                 $this->diffHeader( $previousRev, 'o' ) .
 913                                 "</td>\n" .
 914                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 915                                 $this->diffHeader( $currentRev, 'n' ) .
 916                                 "</td>\n" .
 917                         "</tr>" .
 918                         $diffEngine->generateContentDiffBody(
 919                                 $previousRev->getContent(), $currentRev->getContent() ) .
 920                         "</table>" .
 921                         "</div>\n"
 922                 );
 923         }
 924
 925         /**
 926          * @param $rev Revision
 927          * @param $prefix
 928          * @return string
 929          */
 930         private function diffHeader( $rev, $prefix ) {
 931                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 932                 if( $isDeleted ) {
 933                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 934                         $targetPage = $this->getTitle();
 935                         $targetQuery = array(
 936                                 'target' => $this->mTargetObj->getPrefixedText(),
 937                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 938                         );
 939                 } else {
 940                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 941                         $targetPage = $rev->getTitle();
 942                         $targetQuery = array( 'oldid' => $rev->getId() );
 943                 }
 944                 // Add show/hide deletion links if available
 945                 $user = $this->getUser();
 946                 $lang = $this->getLanguage();
 947                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 948                 if ( $rdel ) $rdel = " $rdel";
 949                 return
 950                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 951                                 Linker::link(
 952                                         $targetPage,
 953                                         $this->msg(
 954                                                 'revisionasof',
 955                                                 $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
 956                                                 $lang->userDate( $rev->getTimestamp(), $user ),
 957                                                 $lang->userTime( $rev->getTimestamp(), $user )
 958                                         )->escaped(),
 959                                         array(),
 960                                         $targetQuery
 961                                 ) .
 962                         '</strong></div>' .
 963                         '<div id="mw-diff-'.$prefix.'title2">' .
 964                                 Linker::revUserTools( $rev ) . '<br />' .
 965                         '</div>' .
 966                         '<div id="mw-diff-'.$prefix.'title3">' .
 967                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 968                         '</div>';
 969         }
 970
 971         /**
 972          * Show a form confirming whether a tokenless user really wants to see a file
 973          */
 974         private function showFileConfirmationForm( $key ) {
 975                 $out = $this->getOutput();
 976                 $lang = $this->getLanguage();
 977                 $user = $this->getUser();
 978                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 979                 $out->addWikiMsg( 'undelete-show-file-confirm',
 980                         $this->mTargetObj->getText(),
 981                         $lang->userDate( $file->getTimestamp(), $user ),
 982                         $lang->userTime( $file->getTimestamp(), $user ) );
 983                 $out->addHTML(
 984                         Xml::openElement( 'form', array(
 985                                 'method' => 'POST',
 986                                 'action' => $this->getTitle()->getLocalURL(
 987                                         'target=' . urlencode( $this->mTarget ) .
 988                                         '&file=' . urlencode( $key ) .
 989                                         '&token=' . urlencode( $user->getEditToken( $key ) ) )
 990                                 )
 991                         ) .
 992                         Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
 993                         '</form>'
 994                 );
 995         }
 996
 997         /**
 998          * Show a deleted file version requested by the visitor.
 999          */
1000         private function showFile( $key ) {
1001                 $this->getOutput()->disable();
1002
1003                 # We mustn't allow the output to be Squid cached, otherwise
1004                 # if an admin previews a deleted image, and it's cached, then
1005                 # a user without appropriate permissions can toddle off and
1006                 # nab the image, and Squid will serve it
1007                 $response = $this->getRequest()->response();
1008                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1009                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1010                 $response->header( 'Pragma: no-cache' );
1011
1012                 $repo = RepoGroup::singleton()->getLocalRepo();
1013                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1014                 $repo->streamFile( $path );
1015         }
1016
1017         private function showHistory() {
1018                 $out = $this->getOutput();
1019                 if( $this->mAllowed ) {
1020                         $out->addModules( 'mediawiki.special.undelete' );
1021                 }
1022                 $out->wrapWikiMsg(
1023                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1024                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1025                 );
1026
1027                 $archive = new PageArchive( $this->mTargetObj );
1028                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1029                 /*
1030                 $text = $archive->getLastRevisionText();
1031                 if( is_null( $text ) ) {
1032                         $out->addWikiMsg( 'nohistory' );
1033                         return;
1034                 }
1035                 */
1036                 $out->addHTML( '<div class="mw-undelete-history">' );
1037                 if ( $this->mAllowed ) {
1038                         $out->addWikiMsg( 'undeletehistory' );
1039                         $out->addWikiMsg( 'undeleterevdel' );
1040                 } else {
1041                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1042                 }
1043                 $out->addHTML( '</div>' );
1044
1045                 # List all stored revisions
1046                 $revisions = $archive->listRevisions();
1047                 $files = $archive->listFiles();
1048
1049                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1050                 $haveFiles = $files && $files->numRows() > 0;
1051
1052                 # Batch existence check on user and talk pages
1053                 if( $haveRevisions ) {
1054                         $batch = new LinkBatch();
1055                         foreach ( $revisions as $row ) {
1056                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1057                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1058                         }
1059                         $batch->execute();
1060                         $revisions->seek( 0 );
1061                 }
1062                 if( $haveFiles ) {
1063                         $batch = new LinkBatch();
1064                         foreach ( $files as $row ) {
1065                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1066                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1067                         }
1068                         $batch->execute();
1069                         $files->seek( 0 );
1070                 }
1071
1072                 if ( $this->mAllowed ) {
1073                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1074                         # Start the form here
1075                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1076                         $out->addHTML( $top );
1077                 }
1078
1079                 # Show relevant lines from the deletion log:
1080                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1081                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1082                 # Show relevant lines from the suppression log:
1083                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1084                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1085                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1086                 }
1087
1088                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1089                         # Format the user-visible controls (comment field, submission button)
1090                         # in a nice little table
1091                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1092                                 $unsuppressBox =
1093                                         "<tr>
1094                                                 <td>&#160;</td>
1095                                                 <td class='mw-input'>" .
1096                                                         Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1097                                                                 'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ).
1098                                                 "</td>
1099                                         </tr>";
1100                         } else {
1101                                 $unsuppressBox = '';
1102                         }
1103                         $table =
1104                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1105                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1106                                         "<tr>
1107                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1108                                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1109                                                 "</td>
1110                                         </tr>
1111                                         <tr>
1112                                                 <td class='mw-label'>" .
1113                                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1114                                                 "</td>
1115                                                 <td class='mw-input'>" .
1116                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1117                                                 "</td>
1118                                         </tr>
1119                                         <tr>
1120                                                 <td>&#160;</td>
1121                                                 <td class='mw-submit'>" .
1122                                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1123                                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1124                                                 "</td>
1125                                         </tr>" .
1126                                         $unsuppressBox .
1127                                 Xml::closeElement( 'table' ) .
1128                                 Xml::closeElement( 'fieldset' );
1129
1130                         $out->addHTML( $table );
1131                 }
1132
1133                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1134
1135                 if( $haveRevisions ) {
1136                         # The page's stored (deleted) history:
1137                         $out->addHTML( '<ul>' );
1138                         $remaining = $revisions->numRows();
1139                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1140
1141                         foreach ( $revisions as $row ) {
1142                                 $remaining--;
1143                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1144                         }
1145                         $revisions->free();
1146                         $out->addHTML( '</ul>' );
1147                 } else {
1148                         $out->addWikiMsg( 'nohistory' );
1149                 }
1150
1151                 if( $haveFiles ) {
1152                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1153                         $out->addHTML( '<ul>' );
1154                         foreach ( $files as $row ) {
1155                                 $out->addHTML( $this->formatFileRow( $row ) );
1156                         }
1157                         $files->free();
1158                         $out->addHTML( '</ul>' );
1159                 }
1160
1161                 if ( $this->mAllowed ) {
1162                         # Slip in the hidden controls here
1163                         $misc  = Html::hidden( 'target', $this->mTarget );
1164                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1165                         $misc .= Xml::closeElement( 'form' );
1166                         $out->addHTML( $misc );
1167                 }
1168
1169                 return true;
1170         }
1171
1172         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1173                 $rev = Revision::newFromArchiveRow( $row,
1174                         array( 'page' => $this->mTargetObj->getArticleID() ) );
1175                 $stxt = '';
1176                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1177                 // Build checkboxen...
1178                 if( $this->mAllowed ) {
1179                         if( $this->mInvert ) {
1180                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1181                                         $checkBox = Xml::check( "ts$ts" );
1182                                 } else {
1183                                         $checkBox = Xml::check( "ts$ts", true );
1184                                 }
1185                         } else {
1186                                 $checkBox = Xml::check( "ts$ts" );
1187                         }
1188                 } else {
1189                         $checkBox = '';
1190                 }
1191                 $user = $this->getUser();
1192                 // Build page & diff links...
1193                 if( $this->mCanView ) {
1194                         $titleObj = $this->getTitle();
1195                         # Last link
1196                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1197                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1198                                 $last = $this->msg( 'diff' )->escaped();
1199                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1200                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1201                                 $last = Linker::linkKnown(
1202                                         $titleObj,
1203                                         $this->msg( 'diff' )->escaped(),
1204                                         array(),
1205                                         array(
1206                                                 'target' => $this->mTargetObj->getPrefixedText(),
1207                                                 'timestamp' => $ts,
1208                                                 'diff' => 'prev'
1209                                         )
1210                                 );
1211                         } else {
1212                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1213                                 $last = $this->msg( 'diff' )->escaped();
1214                         }
1215                 } else {
1216                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1217                         $last = $this->msg( 'diff' )->escaped();
1218                 }
1219                 // User links
1220                 $userLink = Linker::revUserTools( $rev );
1221                 // Revision text size
1222                 $size = $row->ar_len;
1223                 if( !is_null( $size ) ) {
1224                         $stxt = Linker::formatRevisionSize( $size );
1225                 }
1226                 // Edit summary
1227                 $comment = Linker::revComment( $rev );
1228                 // Revision delete links
1229                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1230                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1231         }
1232
1233         private function formatFileRow( $row ) {
1234                 $file = ArchivedFile::newFromRow( $row );
1235
1236                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1237                 $user = $this->getUser();
1238                 if( $this->mAllowed && $row->fa_storage_key ) {
1239                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1240                         $key = urlencode( $row->fa_storage_key );
1241                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1242                 } else {
1243                         $checkBox = '';
1244                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1245                 }
1246                 $userLink = $this->getFileUser( $file );
1247                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1248                 $bytes = $this->msg( 'parentheses' )->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )->plain();
1249                 $data = htmlspecialchars( $data . ' ' . $bytes );
1250                 $comment = $this->getFileComment( $file );
1251
1252                 // Add show/hide deletion links if available
1253                 $canHide = $user->isAllowed( 'deleterevision' );
1254                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1255                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1256                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1257                         } else {
1258                                 $query = array(
1259                                         'type' => 'filearchive',
1260                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1261                                         'ids' => $row->fa_id
1262                                 );
1263                                 $revdlink = Linker::revDeleteLink( $query,
1264                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1265                         }
1266                 } else {
1267                         $revdlink = '';
1268                 }
1269
1270                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1271         }
1272
1273         /**
1274          * Fetch revision text link if it's available to all users
1275          *
1276          * @param $rev Revision
1277          * @param $titleObj Title
1278          * @param $ts string Timestamp
1279          * @return string
1280          */
1281         function getPageLink( $rev, $titleObj, $ts ) {
1282                 $user = $this->getUser();
1283                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1284
1285                 if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1286                         return '<span class="history-deleted">' . $time . '</span>';
1287                 } else {
1288                         $link = Linker::linkKnown(
1289                                 $titleObj,
1290                                 htmlspecialchars( $time ),
1291                                 array(),
1292                                 array(
1293                                         'target' => $this->mTargetObj->getPrefixedText(),
1294                                         'timestamp' => $ts
1295                                 )
1296                         );
1297                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1298                                 $link = '<span class="history-deleted">' . $link . '</span>';
1299                         }
1300                         return $link;
1301                 }
1302         }
1303
1304         /**
1305          * Fetch image view link if it's available to all users
1306          *
1307          * @param $file File
1308          * @param $titleObj Title
1309          * @param $ts string A timestamp
1310          * @param $key String: a storage key
1311          *
1312          * @return String: HTML fragment
1313          */
1314         function getFileLink( $file, $titleObj, $ts, $key ) {
1315                 $user = $this->getUser();
1316                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1317
1318                 if( !$file->userCan( File::DELETED_FILE, $user ) ) {
1319                         return '<span class="history-deleted">' . $time . '</span>';
1320                 } else {
1321                         $link = Linker::linkKnown(
1322                                 $titleObj,
1323                                 htmlspecialchars( $time ),
1324                                 array(),
1325                                 array(
1326                                         'target' => $this->mTargetObj->getPrefixedText(),
1327                                         'file' => $key,
1328                                         'token' => $user->getEditToken( $key )
1329                                 )
1330                         );
1331                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1332                                 $link = '<span class="history-deleted">' . $link . '</span>';
1333                         }
1334                         return $link;
1335                 }
1336         }
1337
1338         /**
1339          * Fetch file's user id if it's available to this user
1340          *
1341          * @param $file File
1342          * @return String: HTML fragment
1343          */
1344         function getFileUser( $file ) {
1345                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1346                         return '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1347                 } else {
1348                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1349                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1350                         if( $file->isDeleted( File::DELETED_USER ) ) {
1351                                 $link = '<span class="history-deleted">' . $link . '</span>';
1352                         }
1353                         return $link;
1354                 }
1355         }
1356
1357         /**
1358          * Fetch file upload comment if it's available to this user
1359          *
1360          * @param $file File
1361          * @return String: HTML fragment
1362          */
1363         function getFileComment( $file ) {
1364                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1365                         return '<span class="history-deleted"><span class="comment">' .
1366                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1367                 } else {
1368                         $link = Linker::commentBlock( $file->getRawDescription() );
1369                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1370                                 $link = '<span class="history-deleted">' . $link . '</span>';
1371                         }
1372                         return $link;
1373                 }
1374         }
1375
1376         function undelete() {
1377                 global $wgUploadMaintenance;
1378
1379                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1380                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1381                 }
1382
1383                 if ( wfReadOnly() ) {
1384                         throw new ReadOnlyError;
1385                 }
1386
1387                 $out = $this->getOutput();
1388                 $archive = new PageArchive( $this->mTargetObj );
1389                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1390                 $ok = $archive->undelete(
1391                         $this->mTargetTimestamp,
1392                         $this->mComment,
1393                         $this->mFileVersions,
1394                         $this->mUnsuppress );
1395
1396                 if( is_array( $ok ) ) {
1397                         if ( $ok[1] ) { // Undeleted file count
1398                                 wfRunHooks( 'FileUndeleteComplete', array(
1399                                         $this->mTargetObj, $this->mFileVersions,
1400                                         $this->getUser(), $this->mComment ) );
1401                         }
1402
1403                         $link = Linker::linkKnown( $this->mTargetObj );
1404                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1405                 } else {
1406                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1407                         $out->addWikiMsg( 'cannotundelete' );
1408                         $out->addWikiMsg( 'undeleterevdel' );
1409                 }
1410
1411                 // Show file deletion warnings and errors
1412                 $status = $archive->getFileStatus();
1413                 if( $status && !$status->isGood() ) {
1414                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1415                 }
1416         }
1417 }