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