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' => array( 'ar_namespace', 'ar_title' ),
 101                                         'ORDER BY' => array( 'ar_namespace', 'ar_title' ),
 102                                         'LIMIT' => 100,
 103                                 )
 104                         )
 105                 );
 106         }
 107
 108         /**
 109          * List the revisions of the given page. Returns result wrapper with
 110          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 111          *
 112          * @return ResultWrapper
 113          */
 114         function listRevisions() {
 115                 $dbr = wfGetDB( DB_SLAVE );
 116                 $res = $dbr->select( 'archive',
 117                         array(
 118                                 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 119                                 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1'
 120                         ),
 121                         array( 'ar_namespace' => $this->title->getNamespace(),
 122                                    'ar_title' => $this->title->getDBkey() ),
 123                         'PageArchive::listRevisions',
 124                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 125                 $ret = $dbr->resultObject( $res );
 126                 return $ret;
 127         }
 128
 129         /**
 130          * List the deleted file revisions for this page, if it's a file page.
 131          * Returns a result wrapper with various filearchive fields, or null
 132          * if not a file page.
 133          *
 134          * @return ResultWrapper
 135          * @todo Does this belong in Image for fuller encapsulation?
 136          */
 137         function listFiles() {
 138                 if( $this->title->getNamespace() == NS_FILE ) {
 139                         $dbr = wfGetDB( DB_SLAVE );
 140                         $res = $dbr->select( 'filearchive',
 141                                 array(
 142                                         'fa_id',
 143                                         'fa_name',
 144                                         'fa_archive_name',
 145                                         'fa_storage_key',
 146                                         'fa_storage_group',
 147                                         'fa_size',
 148                                         'fa_width',
 149                                         'fa_height',
 150                                         'fa_bits',
 151                                         'fa_metadata',
 152                                         'fa_media_type',
 153                                         'fa_major_mime',
 154                                         'fa_minor_mime',
 155                                         'fa_description',
 156                                         'fa_user',
 157                                         'fa_user_text',
 158                                         'fa_timestamp',
 159                                         'fa_deleted' ),
 160                                 array( 'fa_name' => $this->title->getDBkey() ),
 161                                 __METHOD__,
 162                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 163                         $ret = $dbr->resultObject( $res );
 164                         return $ret;
 165                 }
 166                 return null;
 167         }
 168
 169         /**
 170          * Return a Revision object containing data for the deleted revision.
 171          * Note that the result *may* or *may not* have a null page ID.
 172          *
 173          * @param $timestamp String
 174          * @return Revision
 175          */
 176         function getRevision( $timestamp ) {
 177                 $dbr = wfGetDB( DB_SLAVE );
 178                 $row = $dbr->selectRow( 'archive',
 179                         array(
 180                                 'ar_rev_id',
 181                                 'ar_text',
 182                                 'ar_comment',
 183                                 'ar_user',
 184                                 'ar_user_text',
 185                                 'ar_timestamp',
 186                                 'ar_minor_edit',
 187                                 'ar_flags',
 188                                 'ar_text_id',
 189                                 'ar_deleted',
 190                                 'ar_len',
 191                                 'ar_sha1',
 192                         ),
 193                         array( 'ar_namespace' => $this->title->getNamespace(),
 194                                         'ar_title' => $this->title->getDBkey(),
 195                                         'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 196                         __METHOD__ );
 197                 if( $row ) {
 198                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleID() ) );
 199                 } else {
 200                         return null;
 201                 }
 202         }
 203
 204         /**
 205          * Return the most-previous revision, either live or deleted, against
 206          * the deleted revision given by timestamp.
 207          *
 208          * May produce unexpected results in case of history merges or other
 209          * unusual time issues.
 210          *
 211          * @param $timestamp String
 212          * @return Revision or null
 213          */
 214         function getPreviousRevision( $timestamp ) {
 215                 $dbr = wfGetDB( DB_SLAVE );
 216
 217                 // Check the previous deleted revision...
 218                 $row = $dbr->selectRow( 'archive',
 219                         'ar_timestamp',
 220                         array( 'ar_namespace' => $this->title->getNamespace(),
 221                                    'ar_title' => $this->title->getDBkey(),
 222                                    'ar_timestamp < ' .
 223                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 224                         __METHOD__,
 225                         array(
 226                                 'ORDER BY' => 'ar_timestamp DESC',
 227                                 'LIMIT' => 1 ) );
 228                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 229
 230                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 231                         array( 'rev_id', 'rev_timestamp' ),
 232                         array(
 233                                 'page_namespace' => $this->title->getNamespace(),
 234                                 'page_title' => $this->title->getDBkey(),
 235                                 'page_id = rev_page',
 236                                 'rev_timestamp < ' .
 237                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 238                         __METHOD__,
 239                         array(
 240                                 'ORDER BY' => 'rev_timestamp DESC',
 241                                 'LIMIT' => 1 ) );
 242                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 243                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 244
 245                 if( $prevLive && $prevLive > $prevDeleted ) {
 246                         // Most prior revision was live
 247                         return Revision::newFromId( $prevLiveId );
 248                 } elseif( $prevDeleted ) {
 249                         // Most prior revision was deleted
 250                         return $this->getRevision( $prevDeleted );
 251                 } else {
 252                         // No prior revision on this page.
 253                         return null;
 254                 }
 255         }
 256
 257         /**
 258          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 259          *
 260          * @param $row Object: database row
 261          * @return Revision
 262          */
 263         function getTextFromRow( $row ) {
 264                 if( is_null( $row->ar_text_id ) ) {
 265                         // An old row from MediaWiki 1.4 or previous.
 266                         // Text is embedded in this row in classic compression format.
 267                         return Revision::getRevisionText( $row, 'ar_' );
 268                 } else {
 269                         // New-style: keyed to the text storage backend.
 270                         $dbr = wfGetDB( DB_SLAVE );
 271                         $text = $dbr->selectRow( 'text',
 272                                 array( 'old_text', 'old_flags' ),
 273                                 array( 'old_id' => $row->ar_text_id ),
 274                                 __METHOD__ );
 275                         return Revision::getRevisionText( $text );
 276                 }
 277         }
 278
 279         /**
 280          * Fetch (and decompress if necessary) the stored text of the most
 281          * recently edited deleted revision of the page.
 282          *
 283          * If there are no archived revisions for the page, returns NULL.
 284          *
 285          * @return String
 286          */
 287         function getLastRevisionText() {
 288                 $dbr = wfGetDB( DB_SLAVE );
 289                 $row = $dbr->selectRow( 'archive',
 290                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 291                         array( 'ar_namespace' => $this->title->getNamespace(),
 292                                    'ar_title' => $this->title->getDBkey() ),
 293                         __METHOD__,
 294                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 295                 if( $row ) {
 296                         return $this->getTextFromRow( $row );
 297                 } else {
 298                         return null;
 299                 }
 300         }
 301
 302         /**
 303          * Quick check if any archived revisions are present for the page.
 304          *
 305          * @return Boolean
 306          */
 307         function isDeleted() {
 308                 $dbr = wfGetDB( DB_SLAVE );
 309                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 310                         array( 'ar_namespace' => $this->title->getNamespace(),
 311                                    'ar_title' => $this->title->getDBkey() ) );
 312                 return ( $n > 0 );
 313         }
 314
 315         /**
 316          * Restore the given (or all) text and file revisions for the page.
 317          * Once restored, the items will be removed from the archive tables.
 318          * The deletion log will be updated with an undeletion notice.
 319          *
 320          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 321          * @param $comment String
 322          * @param $fileVersions Array
 323          * @param $unsuppress Boolean
 324          * @param $user User doing the action, or null to use $wgUser
 325          *
 326          * @return array(number of file revisions restored, number of image revisions restored, log message)
 327          * on success, false on failure
 328          */
 329         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false, User $user = null ) {
 330                 global $wgContLang, $wgUser;
 331
 332                 // If both the set of text revisions and file revisions are empty,
 333                 // restore everything. Otherwise, just restore the requested items.
 334                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 335
 336                 $restoreText = $restoreAll || !empty( $timestamps );
 337                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 338
 339                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 340                         $img = wfLocalFile( $this->title );
 341                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 342                         if ( !$this->fileStatus->isOk() ) {
 343                                 return false;
 344                         }
 345                         $filesRestored = $this->fileStatus->successCount;
 346                 } else {
 347                         $filesRestored = 0;
 348                 }
 349
 350                 if( $restoreText ) {
 351                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 352                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 353                                 return false;
 354                         }
 355                 } else {
 356                         $textRestored = 0;
 357                 }
 358
 359                 // Touch the log!
 360
 361                 if( $textRestored && $filesRestored ) {
 362                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 363                                 $wgContLang->formatNum( $textRestored ),
 364                                 $wgContLang->formatNum( $filesRestored ) );
 365                 } elseif( $textRestored ) {
 366                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 367                                 $wgContLang->formatNum( $textRestored ) );
 368                 } elseif( $filesRestored ) {
 369                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 370                                 $wgContLang->formatNum( $filesRestored ) );
 371                 } else {
 372                         wfDebug( "Undelete: nothing undeleted...\n" );
 373                         return false;
 374                 }
 375
 376                 if( trim( $comment ) != '' ) {
 377                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 378                 }
 379
 380                 if ( $user === null ) {
 381                         $user = $wgUser;
 382                 }
 383
 384                 $logEntry = new ManualLogEntry( 'delete', 'restore' );
 385                 $logEntry->setPerformer( $user );
 386                 $logEntry->setTarget( $this->title );
 387                 $logEntry->setComment( $reason );
 388                 $logid = $logEntry->insert();
 389                 $logEntry->publish( $logid );
 390
 391                 return array( $textRestored, $filesRestored, $reason );
 392         }
 393
 394         /**
 395          * This is the meaty bit -- restores archived revisions of the given page
 396          * to the cur/old tables. If the page currently exists, all revisions will
 397          * be stuffed into old, otherwise the most recent will go into cur.
 398          *
 399          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 400          * @param $comment String
 401          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 402          *
 403          * @return Mixed: number of revisions restored or false on failure
 404          */
 405         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 406                 if ( wfReadOnly() ) {
 407                         return false;
 408                 }
 409                 $restoreAll = empty( $timestamps );
 410
 411                 $dbw = wfGetDB( DB_MASTER );
 412
 413                 # Does this page already exist? We'll have to update it...
 414                 $article = WikiPage::factory( $this->title );
 415                 # Load latest data for the current page (bug 31179)
 416                 $article->loadPageData( 'fromdbmaster' );
 417                 $oldcountable = $article->isCountable();
 418
 419                 $page = $dbw->selectRow( 'page',
 420                         array( 'page_id', 'page_latest' ),
 421                         array( 'page_namespace' => $this->title->getNamespace(),
 422                                    'page_title'     => $this->title->getDBkey() ),
 423                         __METHOD__,
 424                         array( 'FOR UPDATE' ) // lock page
 425                 );
 426                 if( $page ) {
 427                         $makepage = false;
 428                         # Page already exists. Import the history, and if necessary
 429                         # we'll update the latest revision field in the record.
 430                         $newid             = 0;
 431                         $pageId            = $page->page_id;
 432                         $previousRevId    = $page->page_latest;
 433                         # Get the time span of this page
 434                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 435                                 array( 'rev_id' => $previousRevId ),
 436                                 __METHOD__ );
 437                         if( $previousTimestamp === false ) {
 438                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 439                                 return 0;
 440                         }
 441                 } else {
 442                         # Have to create a new article...
 443                         $makepage = true;
 444                         $previousRevId = 0;
 445                         $previousTimestamp = 0;
 446                 }
 447
 448                 if( $restoreAll ) {
 449                         $oldones = '1 = 1'; # All revisions...
 450                 } else {
 451                         $oldts = implode( ',',
 452                                 array_map( array( &$dbw, 'addQuotes' ),
 453                                         array_map( array( &$dbw, 'timestamp' ),
 454                                                 $timestamps ) ) );
 455
 456                         $oldones = "ar_timestamp IN ( {$oldts} )";
 457                 }
 458
 459                 /**
 460                  * Select each archived revision...
 461                  */
 462                 $result = $dbw->select( 'archive',
 463                         /* fields */ array(
 464                                 'ar_rev_id',
 465                                 'ar_text',
 466                                 'ar_comment',
 467                                 'ar_user',
 468                                 'ar_user_text',
 469                                 'ar_timestamp',
 470                                 'ar_minor_edit',
 471                                 'ar_flags',
 472                                 'ar_text_id',
 473                                 'ar_deleted',
 474                                 'ar_page_id',
 475                                 'ar_len',
 476                                 'ar_sha1' ),
 477                         /* WHERE */ array(
 478                                 'ar_namespace' => $this->title->getNamespace(),
 479                                 'ar_title'     => $this->title->getDBkey(),
 480                                 $oldones ),
 481                         __METHOD__,
 482                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 483                 );
 484                 $ret = $dbw->resultObject( $result );
 485                 $rev_count = $dbw->numRows( $result );
 486                 if( !$rev_count ) {
 487                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 488                         return false; // ???
 489                 }
 490
 491                 $ret->seek( $rev_count - 1 ); // move to last
 492                 $row = $ret->fetchObject(); // get newest archived rev
 493                 $ret->seek( 0 ); // move back
 494
 495                 if( $makepage ) {
 496                         // Check the state of the newest to-be version...
 497                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 498                                 return false; // we can't leave the current revision like this!
 499                         }
 500                         // Safe to insert now...
 501                         $newid  = $article->insertOn( $dbw );
 502                         $pageId = $newid;
 503                 } else {
 504                         // Check if a deleted revision will become the current revision...
 505                         if( $row->ar_timestamp > $previousTimestamp ) {
 506                                 // Check the state of the newest to-be version...
 507                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 508                                         return false; // we can't leave the current revision like this!
 509                                 }
 510                         }
 511                 }
 512
 513                 $revision = null;
 514                 $restored = 0;
 515
 516                 foreach ( $ret as $row ) {
 517                         // Check for key dupes due to shitty archive integrity.
 518                         if( $row->ar_rev_id ) {
 519                                 $exists = $dbw->selectField( 'revision', '1',
 520                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 521                                 if( $exists ) {
 522                                         continue; // don't throw DB errors
 523                                 }
 524                         }
 525                         // Insert one revision at a time...maintaining deletion status
 526                         // unless we are specifically removing all restrictions...
 527                         $revision = Revision::newFromArchiveRow( $row,
 528                                 array(
 529                                         'page' => $pageId,
 530                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 531                                 ) );
 532
 533                         $revision->insertOn( $dbw );
 534                         $restored++;
 535
 536                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 537                 }
 538                 # Now that it's safely stored, take it out of the archive
 539                 $dbw->delete( 'archive',
 540                         /* WHERE */ array(
 541                                 'ar_namespace' => $this->title->getNamespace(),
 542                                 'ar_title' => $this->title->getDBkey(),
 543                                 $oldones ),
 544                         __METHOD__ );
 545
 546                 // Was anything restored at all?
 547                 if ( $restored == 0 ) {
 548                         return 0;
 549                 }
 550
 551                 $created = (bool)$newid;
 552
 553                 // Attach the latest revision to the page...
 554                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 555                 if ( $created || $wasnew ) {
 556                         // Update site stats, link tables, etc
 557                         $user = User::newFromName( $revision->getRawUserText(), false );
 558                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 559                 }
 560
 561                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 562
 563                 if( $this->title->getNamespace() == NS_FILE ) {
 564                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 565                         $update->doUpdate();
 566                 }
 567
 568                 return $restored;
 569         }
 570
 571         /**
 572          * @return Status
 573          */
 574         function getFileStatus() { return $this->fileStatus; }
 575 }
 576
 577 /**
 578  * Special page allowing users with the appropriate permissions to view
 579  * and restore deleted content.
 580  *
 581  * @ingroup SpecialPage
 582  */
 583 class SpecialUndelete extends SpecialPage {
 584         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 585         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 586
 587         /**
 588          * @var Title
 589          */
 590         var $mTargetObj;
 591
 592         function __construct() {
 593                 parent::__construct( 'Undelete', 'deletedhistory' );
 594         }
 595
 596         function loadRequest( $par ) {
 597                 $request = $this->getRequest();
 598                 $user = $this->getUser();
 599
 600                 $this->mAction = $request->getVal( 'action' );
 601                 if ( $par !== null && $par !== '' ) {
 602                         $this->mTarget = $par;
 603                 } else {
 604                         $this->mTarget = $request->getVal( 'target' );
 605                 }
 606                 $this->mTargetObj = null;
 607                 if ( $this->mTarget !== null && $this->mTarget !== '' ) {
 608                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 609                 }
 610                 $this->mSearchPrefix = $request->getText( 'prefix' );
 611                 $time = $request->getVal( 'timestamp' );
 612                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 613                 $this->mFilename = $request->getVal( 'file' );
 614
 615                 $posted = $request->wasPosted() &&
 616                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 617                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 618                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 619                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 620                 $this->mDiff = $request->getCheck( 'diff' );
 621                 $this->mDiffOnly = $request->getBool( 'diffonly', $this->getUser()->getOption( 'diffonly' ) );
 622                 $this->mComment = $request->getText( 'wpComment' );
 623                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 624                 $this->mToken = $request->getVal( 'token' );
 625
 626                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 627                         $this->mAllowed = true; // user can restore
 628                         $this->mCanView = true; // user can view content
 629                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 630                         $this->mAllowed = false; // user cannot restore
 631                         $this->mCanView = true; // user can view content
 632                         $this->mRestore = false;
 633                 } else { // user can only view the list of revisions
 634                         $this->mAllowed = false;
 635                         $this->mCanView = false;
 636                         $this->mTimestamp = '';
 637                         $this->mRestore = false;
 638                 }
 639
 640                 if( $this->mRestore || $this->mInvert ) {
 641                         $timestamps = array();
 642                         $this->mFileVersions = array();
 643                         foreach( $request->getValues() as $key => $val ) {
 644                                 $matches = array();
 645                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 646                                         array_push( $timestamps, $matches[1] );
 647                                 }
 648
 649                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 650                                         $this->mFileVersions[] = intval( $matches[1] );
 651                                 }
 652                         }
 653                         rsort( $timestamps );
 654                         $this->mTargetTimestamp = $timestamps;
 655                 }
 656         }
 657
 658         function execute( $par ) {
 659                 $this->checkPermissions();
 660                 $user = $this->getUser();
 661
 662                 $this->setHeaders();
 663                 $this->outputHeader();
 664
 665                 $this->loadRequest( $par );
 666
 667                 $out = $this->getOutput();
 668
 669                 if ( is_null( $this->mTargetObj ) ) {
 670                         $out->addWikiMsg( 'undelete-header' );
 671
 672                         # Not all users can just browse every deleted page from the list
 673                         if ( $user->isAllowed( 'browsearchive' ) ) {
 674                                 $this->showSearchForm();
 675                         }
 676                         return;
 677                 }
 678
 679                 if ( $this->mAllowed ) {
 680                         $out->setPageTitle( $this->msg( 'undeletepage' ) );
 681                 } else {
 682                         $out->setPageTitle( $this->msg( 'viewdeletedpage' ) );
 683                 }
 684
 685                 $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 686
 687                 if ( $this->mTimestamp !== '' ) {
 688                         $this->showRevision( $this->mTimestamp );
 689                 } elseif ( $this->mFilename !== null ) {
 690                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 691                         // Check if user is allowed to see this file
 692                         if ( !$file->exists() ) {
 693                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 694                         } elseif ( !$file->userCan( File::DELETED_FILE, $user ) ) {
 695                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 696                                         throw new PermissionsError( 'suppressrevision' );
 697                                 } else {
 698                                         throw new PermissionsError( 'deletedtext' );
 699                                 }
 700                         } elseif ( !$user->matchEditToken( $this->mToken, $this->mFilename ) ) {
 701                                 $this->showFileConfirmationForm( $this->mFilename );
 702                         } else {
 703                                 $this->showFile( $this->mFilename );
 704                         }
 705                 } elseif ( $this->mRestore && $this->mAction == 'submit' ) {
 706                         $this->undelete();
 707                 } else {
 708                         $this->showHistory();
 709                 }
 710         }
 711
 712         function showSearchForm() {
 713                 global $wgScript;
 714
 715                 $out = $this->getOutput();
 716                 $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
 717                 $out->addHTML(
 718                         Xml::openElement( 'form', array(
 719                                 'method' => 'get',
 720                                 'action' => $wgScript ) ) .
 721                         Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
 722                         Html::hidden( 'title',
 723                                 $this->getTitle()->getPrefixedDbKey() ) .
 724                         Xml::inputLabel( $this->msg( 'undelete-search-prefix' )->text(),
 725                                 'prefix', 'prefix', 20,
 726                                 $this->mSearchPrefix ) . ' ' .
 727                         Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
 728                         Xml::closeElement( 'fieldset' ) .
 729                         Xml::closeElement( 'form' )
 730                 );
 731
 732                 # List undeletable articles
 733                 if( $this->mSearchPrefix ) {
 734                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 735                         $this->showList( $result );
 736                 }
 737         }
 738
 739         /**
 740          * Generic list of deleted pages
 741          *
 742          * @param $result ResultWrapper
 743          * @return bool
 744          */
 745         private function showList( $result ) {
 746                 $out = $this->getOutput();
 747
 748                 if( $result->numRows() == 0 ) {
 749                         $out->addWikiMsg( 'undelete-no-results' );
 750                         return;
 751                 }
 752
 753                 $out->addWikiMsg( 'undeletepagetext', $this->getLanguage()->formatNum( $result->numRows() ) );
 754
 755                 $undelete = $this->getTitle();
 756                 $out->addHTML( "<ul>\n" );
 757                 foreach ( $result as $row ) {
 758                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 759                         if ( $title !== null ) {
 760                                 $item = Linker::linkKnown(
 761                                         $undelete,
 762                                         htmlspecialchars( $title->getPrefixedText() ),
 763                                         array(),
 764                                         array( 'target' => $title->getPrefixedText() )
 765                                 );
 766                         } else {
 767                                 // The title is no longer valid, show as text
 768                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 769                                 $item = htmlspecialchars( $title->getPrefixedText() );
 770                         }
 771                         $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
 772                         $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
 773                 }
 774                 $result->free();
 775                 $out->addHTML( "</ul>\n" );
 776
 777                 return true;
 778         }
 779
 780         private function showRevision( $timestamp ) {
 781                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 782                         return 0;
 783                 }
 784
 785                 $archive = new PageArchive( $this->mTargetObj );
 786                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 787                 $rev = $archive->getRevision( $timestamp );
 788
 789                 $out = $this->getOutput();
 790                 $user = $this->getUser();
 791
 792                 if( !$rev ) {
 793                         $out->addWikiMsg( 'undeleterevision-missing' );
 794                         return;
 795                 }
 796
 797                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 798                         if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 799                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 800                                 return;
 801                         } else {
 802                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 803                                 $out->addHTML( '<br />' );
 804                                 // and we are allowed to see...
 805                         }
 806                 }
 807
 808                 if( $this->mDiff ) {
 809                         $previousRev = $archive->getPreviousRevision( $timestamp );
 810                         if( $previousRev ) {
 811                                 $this->showDiff( $previousRev, $rev );
 812                                 if( $this->mDiffOnly ) {
 813                                         return;
 814                                 } else {
 815                                         $out->addHTML( '<hr />' );
 816                                 }
 817                         } else {
 818                                 $out->addWikiMsg( 'undelete-nodiff' );
 819                         }
 820                 }
 821
 822                 $link = Linker::linkKnown(
 823                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 824                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 825                 );
 826
 827                 $lang = $this->getLanguage();
 828
 829                 // date and time are separate parameters to facilitate localisation.
 830                 // $time is kept for backward compat reasons.
 831                 $time = $lang->userTimeAndDate( $timestamp, $user );
 832                 $d = $lang->userDate( $timestamp, $user );
 833                 $t = $lang->userTime( $timestamp, $user );
 834                 $userLink = Linker::revUserTools( $rev );
 835
 836                 if( $this->mPreview ) {
 837                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 838                 } else {
 839                         $openDiv = '<div id="mw-undelete-revision">';
 840                 }
 841                 $out->addHTML( $openDiv );
 842
 843                 // Revision delete links
 844                 if ( !$this->mDiff ) {
 845                         $revdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 846                         if ( $revdel ) {
 847                                 $out->addHTML( "$revdel " );
 848                         }
 849                 }
 850
 851                 $out->addHTML( $this->msg( 'undelete-revision' )->rawParams( $link )->params(
 852                         $time )->rawParams( $userLink )->params( $d, $t )->parse() . '</div>' );
 853                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 854
 855                 if( $this->mPreview ) {
 856                         // Hide [edit]s
 857                         $popts = $out->parserOptions();
 858                         $popts->setEditSection( false );
 859                         $out->parserOptions( $popts );
 860                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER, $user ), $this->mTargetObj, true );
 861                 }
 862
 863                 $out->addHTML(
 864                         Xml::element( 'textarea', array(
 865                                         'readonly' => 'readonly',
 866                                         'cols' => intval( $user->getOption( 'cols' ) ),
 867                                         'rows' => intval( $user->getOption( 'rows' ) ) ),
 868                                 $rev->getText( Revision::FOR_THIS_USER, $user ) . "\n" ) .
 869                         Xml::openElement( 'div' ) .
 870                         Xml::openElement( 'form', array(
 871                                 'method' => 'post',
 872                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 873                         Xml::element( 'input', array(
 874                                 'type' => 'hidden',
 875                                 'name' => 'target',
 876                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 877                         Xml::element( 'input', array(
 878                                 'type' => 'hidden',
 879                                 'name' => 'timestamp',
 880                                 'value' => $timestamp ) ) .
 881                         Xml::element( 'input', array(
 882                                 'type' => 'hidden',
 883                                 'name' => 'wpEditToken',
 884                                 'value' => $user->getEditToken() ) ) .
 885                         Xml::element( 'input', array(
 886                                 'type' => 'submit',
 887                                 'name' => 'preview',
 888                                 'value' => $this->msg( 'showpreview' )->text() ) ) .
 889                         Xml::element( 'input', array(
 890                                 'name' => 'diff',
 891                                 'type' => 'submit',
 892                                 'value' => $this->msg( 'showdiff' )->text() ) ) .
 893                         Xml::closeElement( 'form' ) .
 894                         Xml::closeElement( 'div' ) );
 895         }
 896
 897         /**
 898          * Build a diff display between this and the previous either deleted
 899          * or non-deleted edit.
 900          *
 901          * @param $previousRev Revision
 902          * @param $currentRev Revision
 903          * @return String: HTML
 904          */
 905         function showDiff( $previousRev, $currentRev ) {
 906                 $diffEngine = new DifferenceEngine( $this->getContext() );
 907                 $diffEngine->showDiffStyle();
 908                 $this->getOutput()->addHTML(
 909                         "<div>" .
 910                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 911                         "<col class='diff-marker' />" .
 912                         "<col class='diff-content' />" .
 913                         "<col class='diff-marker' />" .
 914                         "<col class='diff-content' />" .
 915                         "<tr>" .
 916                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 917                                 $this->diffHeader( $previousRev, 'o' ) .
 918                                 "</td>\n" .
 919                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 920                                 $this->diffHeader( $currentRev, 'n' ) .
 921                                 "</td>\n" .
 922                         "</tr>" .
 923                         $diffEngine->generateDiffBody(
 924                                 $previousRev->getText(), $currentRev->getText() ) .
 925                         "</table>" .
 926                         "</div>\n"
 927                 );
 928         }
 929
 930         /**
 931          * @param $rev Revision
 932          * @param $prefix
 933          * @return string
 934          */
 935         private function diffHeader( $rev, $prefix ) {
 936                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 937                 if( $isDeleted ) {
 938                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 939                         $targetPage = $this->getTitle();
 940                         $targetQuery = array(
 941                                 'target' => $this->mTargetObj->getPrefixedText(),
 942                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 943                         );
 944                 } else {
 945                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 946                         $targetPage = $rev->getTitle();
 947                         $targetQuery = array( 'oldid' => $rev->getId() );
 948                 }
 949                 // Add show/hide deletion links if available
 950                 $user = $this->getUser();
 951                 $lang = $this->getLanguage();
 952                 $rdel = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
 953                 if ( $rdel ) $rdel = " $rdel";
 954                 return
 955                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 956                                 Linker::link(
 957                                         $targetPage,
 958                                         $this->msg(
 959                                                 'revisionasof',
 960                                                 $lang->userTimeAndDate( $rev->getTimestamp(), $user ),
 961                                                 $lang->userDate( $rev->getTimestamp(), $user ),
 962                                                 $lang->userTime( $rev->getTimestamp(), $user )
 963                                         )->escaped(),
 964                                         array(),
 965                                         $targetQuery
 966                                 ) .
 967                         '</strong></div>' .
 968                         '<div id="mw-diff-'.$prefix.'title2">' .
 969                                 Linker::revUserTools( $rev ) . '<br />' .
 970                         '</div>' .
 971                         '<div id="mw-diff-'.$prefix.'title3">' .
 972                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 973                         '</div>';
 974         }
 975
 976         /**
 977          * Show a form confirming whether a tokenless user really wants to see a file
 978          */
 979         private function showFileConfirmationForm( $key ) {
 980                 $out = $this->getOutput();
 981                 $lang = $this->getLanguage();
 982                 $user = $this->getUser();
 983                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 984                 $out->addWikiMsg( 'undelete-show-file-confirm',
 985                         $this->mTargetObj->getText(),
 986                         $lang->userDate( $file->getTimestamp(), $user ),
 987                         $lang->userTime( $file->getTimestamp(), $user ) );
 988                 $out->addHTML(
 989                         Xml::openElement( 'form', array(
 990                                 'method' => 'POST',
 991                                 'action' => $this->getTitle()->getLocalURL(
 992                                         'target=' . urlencode( $this->mTarget ) .
 993                                         '&file=' . urlencode( $key ) .
 994                                         '&token=' . urlencode( $user->getEditToken( $key ) ) )
 995                                 )
 996                         ) .
 997                         Xml::submitButton( $this->msg( 'undelete-show-file-submit' )->text() ) .
 998                         '</form>'
 999                 );
1000         }
1001
1002         /**
1003          * Show a deleted file version requested by the visitor.
1004          */
1005         private function showFile( $key ) {
1006                 $this->getOutput()->disable();
1007
1008                 # We mustn't allow the output to be Squid cached, otherwise
1009                 # if an admin previews a deleted image, and it's cached, then
1010                 # a user without appropriate permissions can toddle off and
1011                 # nab the image, and Squid will serve it
1012                 $response = $this->getRequest()->response();
1013                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1014                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1015                 $response->header( 'Pragma: no-cache' );
1016
1017                 $repo = RepoGroup::singleton()->getLocalRepo();
1018                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1019                 $repo->streamFile( $path );
1020         }
1021
1022         private function showHistory() {
1023                 $out = $this->getOutput();
1024                 if( $this->mAllowed ) {
1025                         $out->addModules( 'mediawiki.special.undelete' );
1026                 }
1027                 $out->wrapWikiMsg(
1028                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1029                         array( 'undeletepagetitle', wfEscapeWikiText( $this->mTargetObj->getPrefixedText() ) )
1030                 );
1031
1032                 $archive = new PageArchive( $this->mTargetObj );
1033                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1034                 /*
1035                 $text = $archive->getLastRevisionText();
1036                 if( is_null( $text ) ) {
1037                         $out->addWikiMsg( 'nohistory' );
1038                         return;
1039                 }
1040                 */
1041                 $out->addHTML( '<div class="mw-undelete-history">' );
1042                 if ( $this->mAllowed ) {
1043                         $out->addWikiMsg( 'undeletehistory' );
1044                         $out->addWikiMsg( 'undeleterevdel' );
1045                 } else {
1046                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1047                 }
1048                 $out->addHTML( '</div>' );
1049
1050                 # List all stored revisions
1051                 $revisions = $archive->listRevisions();
1052                 $files = $archive->listFiles();
1053
1054                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1055                 $haveFiles = $files && $files->numRows() > 0;
1056
1057                 # Batch existence check on user and talk pages
1058                 if( $haveRevisions ) {
1059                         $batch = new LinkBatch();
1060                         foreach ( $revisions as $row ) {
1061                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1062                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1063                         }
1064                         $batch->execute();
1065                         $revisions->seek( 0 );
1066                 }
1067                 if( $haveFiles ) {
1068                         $batch = new LinkBatch();
1069                         foreach ( $files as $row ) {
1070                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1071                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1072                         }
1073                         $batch->execute();
1074                         $files->seek( 0 );
1075                 }
1076
1077                 if ( $this->mAllowed ) {
1078                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1079                         # Start the form here
1080                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1081                         $out->addHTML( $top );
1082                 }
1083
1084                 # Show relevant lines from the deletion log:
1085                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1086                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj );
1087                 # Show relevant lines from the suppression log:
1088                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1089                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1090                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj );
1091                 }
1092
1093                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1094                         # Format the user-visible controls (comment field, submission button)
1095                         # in a nice little table
1096                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1097                                 $unsuppressBox =
1098                                         "<tr>
1099                                                 <td>&#160;</td>
1100                                                 <td class='mw-input'>" .
1101                                                         Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
1102                                                                 'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ).
1103                                                 "</td>
1104                                         </tr>";
1105                         } else {
1106                                 $unsuppressBox = '';
1107                         }
1108                         $table =
1109                                 Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
1110                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1111                                         "<tr>
1112                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1113                                                         $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
1114                                                 "</td>
1115                                         </tr>
1116                                         <tr>
1117                                                 <td class='mw-label'>" .
1118                                                         Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
1119                                                 "</td>
1120                                                 <td class='mw-input'>" .
1121                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1122                                                 "</td>
1123                                         </tr>
1124                                         <tr>
1125                                                 <td>&#160;</td>
1126                                                 <td class='mw-submit'>" .
1127                                                         Xml::submitButton( $this->msg( 'undeletebtn' )->text(), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1128                                                         Xml::submitButton( $this->msg( 'undeleteinvert' )->text(), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1129                                                 "</td>
1130                                         </tr>" .
1131                                         $unsuppressBox .
1132                                 Xml::closeElement( 'table' ) .
1133                                 Xml::closeElement( 'fieldset' );
1134
1135                         $out->addHTML( $table );
1136                 }
1137
1138                 $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
1139
1140                 if( $haveRevisions ) {
1141                         # The page's stored (deleted) history:
1142                         $out->addHTML( '<ul>' );
1143                         $remaining = $revisions->numRows();
1144                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1145
1146                         foreach ( $revisions as $row ) {
1147                                 $remaining--;
1148                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1149                         }
1150                         $revisions->free();
1151                         $out->addHTML( '</ul>' );
1152                 } else {
1153                         $out->addWikiMsg( 'nohistory' );
1154                 }
1155
1156                 if( $haveFiles ) {
1157                         $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
1158                         $out->addHTML( '<ul>' );
1159                         foreach ( $files as $row ) {
1160                                 $out->addHTML( $this->formatFileRow( $row ) );
1161                         }
1162                         $files->free();
1163                         $out->addHTML( '</ul>' );
1164                 }
1165
1166                 if ( $this->mAllowed ) {
1167                         # Slip in the hidden controls here
1168                         $misc  = Html::hidden( 'target', $this->mTarget );
1169                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
1170                         $misc .= Xml::closeElement( 'form' );
1171                         $out->addHTML( $misc );
1172                 }
1173
1174                 return true;
1175         }
1176
1177         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1178                 $rev = Revision::newFromArchiveRow( $row,
1179                         array( 'page' => $this->mTargetObj->getArticleID() ) );
1180                 $revTextSize = '';
1181                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1182                 // Build checkboxen...
1183                 if( $this->mAllowed ) {
1184                         if( $this->mInvert ) {
1185                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1186                                         $checkBox = Xml::check( "ts$ts" );
1187                                 } else {
1188                                         $checkBox = Xml::check( "ts$ts", true );
1189                                 }
1190                         } else {
1191                                 $checkBox = Xml::check( "ts$ts" );
1192                         }
1193                 } else {
1194                         $checkBox = '';
1195                 }
1196                 $user = $this->getUser();
1197                 // Build page & diff links...
1198                 if( $this->mCanView ) {
1199                         $titleObj = $this->getTitle();
1200                         # Last link
1201                         if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
1202                                 $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1203                                 $last = $this->msg( 'diff' )->escaped();
1204                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1205                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1206                                 $last = Linker::linkKnown(
1207                                         $titleObj,
1208                                         $this->msg( 'diff' )->escaped(),
1209                                         array(),
1210                                         array(
1211                                                 'target' => $this->mTargetObj->getPrefixedText(),
1212                                                 'timestamp' => $ts,
1213                                                 'diff' => 'prev'
1214                                         )
1215                                 );
1216                         } else {
1217                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1218                                 $last = $this->msg( 'diff' )->escaped();
1219                         }
1220                 } else {
1221                         $pageLink = htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) );
1222                         $last = $this->msg( 'diff' )->escaped();
1223                 }
1224                 // User links
1225                 $userLink = Linker::revUserTools( $rev );
1226                 // Revision text size
1227                 $size = $row->ar_len;
1228                 if( !is_null( $size ) ) {
1229                         $revTextSize = Linker::formatRevisionSize( $size );
1230                 }
1231                 // Edit summary
1232                 $comment = Linker::revComment( $rev );
1233                 // Revision delete links
1234                 $revdlink = Linker::getRevDeleteLink( $user, $rev, $this->mTargetObj );
1235
1236                 $revisionRow = $this->msg( 'undelete-revisionrow' )->rawParams( $checkBox, $revdlink, $last, $pageLink , $userLink, $revTextSize, $comment )->escaped();
1237                 return "<li>$revisionRow</li>";
1238         }
1239
1240         private function formatFileRow( $row ) {
1241                 $file = ArchivedFile::newFromRow( $row );
1242
1243                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1244                 $user = $this->getUser();
1245                 if( $this->mAllowed && $row->fa_storage_key ) {
1246                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1247                         $key = urlencode( $row->fa_storage_key );
1248                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1249                 } else {
1250                         $checkBox = '';
1251                         $pageLink = $this->getLanguage()->userTimeAndDate( $ts, $user );
1252                 }
1253                 $userLink = $this->getFileUser( $file );
1254                 $data = $this->msg( 'widthheight' )->numParams( $row->fa_width, $row->fa_height )->text();
1255                 $bytes = $this->msg( 'parentheses' )->rawParams( $this->msg( 'nbytes' )->numParams( $row->fa_size )->text() )->plain();
1256                 $data = htmlspecialchars( $data . ' ' . $bytes );
1257                 $comment = $this->getFileComment( $file );
1258
1259                 // Add show/hide deletion links if available
1260                 $canHide = $user->isAllowed( 'deleterevision' );
1261                 if( $canHide || ( $file->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
1262                         if( !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1263                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1264                         } else {
1265                                 $query = array(
1266                                         'type' => 'filearchive',
1267                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1268                                         'ids' => $row->fa_id
1269                                 );
1270                                 $revdlink = Linker::revDeleteLink( $query,
1271                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1272                         }
1273                 } else {
1274                         $revdlink = '';
1275                 }
1276
1277                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1278         }
1279
1280         /**
1281          * Fetch revision text link if it's available to all users
1282          *
1283          * @param $rev Revision
1284          * @param $titleObj Title
1285          * @param $ts string Timestamp
1286          * @return string
1287          */
1288         function getPageLink( $rev, $titleObj, $ts ) {
1289                 $user = $this->getUser();
1290                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1291
1292                 if( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
1293                         return '<span class="history-deleted">' . $time . '</span>';
1294                 } else {
1295                         $link = Linker::linkKnown(
1296                                 $titleObj,
1297                                 htmlspecialchars( $time ),
1298                                 array(),
1299                                 array(
1300                                         'target' => $this->mTargetObj->getPrefixedText(),
1301                                         'timestamp' => $ts
1302                                 )
1303                         );
1304                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1305                                 $link = '<span class="history-deleted">' . $link . '</span>';
1306                         }
1307                         return $link;
1308                 }
1309         }
1310
1311         /**
1312          * Fetch image view link if it's available to all users
1313          *
1314          * @param $file File
1315          * @param $titleObj Title
1316          * @param $ts string A timestamp
1317          * @param $key String: a storage key
1318          *
1319          * @return String: HTML fragment
1320          */
1321         function getFileLink( $file, $titleObj, $ts, $key ) {
1322                 $user = $this->getUser();
1323                 $time = $this->getLanguage()->userTimeAndDate( $ts, $user );
1324
1325                 if( !$file->userCan( File::DELETED_FILE, $user ) ) {
1326                         return '<span class="history-deleted">' . $time . '</span>';
1327                 } else {
1328                         $link = Linker::linkKnown(
1329                                 $titleObj,
1330                                 htmlspecialchars( $time ),
1331                                 array(),
1332                                 array(
1333                                         'target' => $this->mTargetObj->getPrefixedText(),
1334                                         'file' => $key,
1335                                         'token' => $user->getEditToken( $key )
1336                                 )
1337                         );
1338                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1339                                 $link = '<span class="history-deleted">' . $link . '</span>';
1340                         }
1341                         return $link;
1342                 }
1343         }
1344
1345         /**
1346          * Fetch file's user id if it's available to this user
1347          *
1348          * @param $file File
1349          * @return String: HTML fragment
1350          */
1351         function getFileUser( $file ) {
1352                 if( !$file->userCan( File::DELETED_USER, $this->getUser() ) ) {
1353                         return '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1354                 } else {
1355                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1356                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1357                         if( $file->isDeleted( File::DELETED_USER ) ) {
1358                                 $link = '<span class="history-deleted">' . $link . '</span>';
1359                         }
1360                         return $link;
1361                 }
1362         }
1363
1364         /**
1365          * Fetch file upload comment if it's available to this user
1366          *
1367          * @param $file File
1368          * @return String: HTML fragment
1369          */
1370         function getFileComment( $file ) {
1371                 if( !$file->userCan( File::DELETED_COMMENT, $this->getUser() ) ) {
1372                         return '<span class="history-deleted"><span class="comment">' .
1373                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span></span>';
1374                 } else {
1375                         $link = Linker::commentBlock( $file->getRawDescription() );
1376                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1377                                 $link = '<span class="history-deleted">' . $link . '</span>';
1378                         }
1379                         return $link;
1380                 }
1381         }
1382
1383         function undelete() {
1384                 global $wgUploadMaintenance;
1385
1386                 if ( $wgUploadMaintenance && $this->mTargetObj->getNamespace() == NS_FILE ) {
1387                         throw new ErrorPageError( 'undelete-error', 'filedelete-maintenance' );
1388                 }
1389
1390                 if ( wfReadOnly() ) {
1391                         throw new ReadOnlyError;
1392                 }
1393
1394                 $out = $this->getOutput();
1395                 $archive = new PageArchive( $this->mTargetObj );
1396                 wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1397                 $ok = $archive->undelete(
1398                         $this->mTargetTimestamp,
1399                         $this->mComment,
1400                         $this->mFileVersions,
1401                         $this->mUnsuppress,
1402                         $this->getUser()
1403                 );
1404
1405                 if( is_array( $ok ) ) {
1406                         if ( $ok[1] ) { // Undeleted file count
1407                                 wfRunHooks( 'FileUndeleteComplete', array(
1408                                         $this->mTargetObj, $this->mFileVersions,
1409                                         $this->getUser(), $this->mComment ) );
1410                         }
1411
1412                         $link = Linker::linkKnown( $this->mTargetObj );
1413                         $out->addHTML( $this->msg( 'undeletedpage' )->rawParams( $link )->parse() );
1414                 } else {
1415                         $out->setPageTitle( $this->msg( 'undelete-error' ) );
1416                         $out->addWikiMsg( 'cannotundelete' );
1417                         $out->addWikiMsg( 'undeleterevdel' );
1418                 }
1419
1420                 // Show file deletion warnings and errors
1421                 $status = $archive->getFileStatus();
1422                 if( $status && !$status->isGood() ) {
1423                         $out->addWikiText( '<div class="error">' . $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) . '</div>' );
1424                 }
1425         }
1426 }