includes/specials/SpecialUndelete.php

   1 <?php
   2
   3 /**
   4  * Special page allowing users with the appropriate permissions to view
   5  * and restore deleted content
   6  *
   7  * @file
   8  * @ingroup SpecialPage
   9  */
  10
  11 /**
  12  * Constructor
  13  */
  14 function wfSpecialUndelete( $par ) {
  15         global $wgRequest;
  16
  17         $form = new UndeleteForm( $wgRequest, $par );
  18         $form->execute();
  19 }
  20
  21 /**
  22  * Used to show archived pages and eventually restore them.
  23  * @ingroup SpecialPage
  24  */
  25 class PageArchive {
  26         protected $title;
  27         var $fileStatus;
  28
  29         function __construct( $title ) {
  30                 if( is_null( $title ) ) {
  31                         throw new MWException( 'Archiver() given a null title.');
  32                 }
  33                 $this->title = $title;
  34         }
  35
  36         /**
  37          * List all deleted pages recorded in the archive table. Returns result
  38          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  39          * namespace/title.
  40          *
  41          * @return ResultWrapper
  42          */
  43         public static function listAllPages() {
  44                 $dbr = wfGetDB( DB_SLAVE );
  45                 return self::listPages( $dbr, '' );
  46         }
  47
  48         /**
  49          * List deleted pages recorded in the archive table matching the
  50          * given title prefix.
  51          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  52          *
  53          * @return ResultWrapper
  54          */
  55         public static function listPagesByPrefix( $prefix ) {
  56                 $dbr = wfGetDB( DB_SLAVE );
  57
  58                 $title = Title::newFromText( $prefix );
  59                 if( $title ) {
  60                         $ns = $title->getNamespace();
  61                         $encPrefix = $dbr->escapeLike( $title->getDBkey() );
  62                 } else {
  63                         // Prolly won't work too good
  64                         // @todo handle bare namespace names cleanly?
  65                         $ns = 0;
  66                         $encPrefix = $dbr->escapeLike( $prefix );
  67                 }
  68                 $conds = array(
  69                         'ar_namespace' => $ns,
  70                         "ar_title LIKE '$encPrefix%'",
  71                 );
  72                 return self::listPages( $dbr, $conds );
  73         }
  74
  75         protected static function listPages( $dbr, $condition ) {
  76                 return $dbr->resultObject(
  77                         $dbr->select(
  78                                 array( 'archive' ),
  79                                 array(
  80                                         'ar_namespace',
  81                                         'ar_title',
  82                                         'COUNT(*) AS count'
  83                                 ),
  84                                 $condition,
  85                                 __METHOD__,
  86                                 array(
  87                                         'GROUP BY' => 'ar_namespace,ar_title',
  88                                         'ORDER BY' => 'ar_namespace,ar_title',
  89                                         'LIMIT' => 100,
  90                                 )
  91                         )
  92                 );
  93         }
  94
  95         /**
  96          * List the revisions of the given page. Returns result wrapper with
  97          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
  98          *
  99          * @return ResultWrapper
 100          */
 101         function listRevisions() {
 102                 $dbr = wfGetDB( DB_SLAVE );
 103                 $res = $dbr->select( 'archive',
 104                         array( 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text', 'ar_comment', 'ar_len', 'ar_deleted' ),
 105                         array( 'ar_namespace' => $this->title->getNamespace(),
 106                                'ar_title' => $this->title->getDBkey() ),
 107                         'PageArchive::listRevisions',
 108                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 109                 $ret = $dbr->resultObject( $res );
 110                 return $ret;
 111         }
 112
 113         /**
 114          * List the deleted file revisions for this page, if it's a file page.
 115          * Returns a result wrapper with various filearchive fields, or null
 116          * if not a file page.
 117          *
 118          * @return ResultWrapper
 119          * @todo Does this belong in Image for fuller encapsulation?
 120          */
 121         function listFiles() {
 122                 if( $this->title->getNamespace() == NS_IMAGE ) {
 123                         $dbr = wfGetDB( DB_SLAVE );
 124                         $res = $dbr->select( 'filearchive',
 125                                 array(
 126                                         'fa_id',
 127                                         'fa_name',
 128                                         'fa_archive_name',
 129                                         'fa_storage_key',
 130                                         'fa_storage_group',
 131                                         'fa_size',
 132                                         'fa_width',
 133                                         'fa_height',
 134                                         'fa_bits',
 135                                         'fa_metadata',
 136                                         'fa_media_type',
 137                                         'fa_major_mime',
 138                                         'fa_minor_mime',
 139                                         'fa_description',
 140                                         'fa_user',
 141                                         'fa_user_text',
 142                                         'fa_timestamp',
 143                                         'fa_deleted' ),
 144                                 array( 'fa_name' => $this->title->getDBkey() ),
 145                                 __METHOD__,
 146                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 147                         $ret = $dbr->resultObject( $res );
 148                         return $ret;
 149                 }
 150                 return null;
 151         }
 152
 153         /**
 154          * Fetch (and decompress if necessary) the stored text for the deleted
 155          * revision of the page with the given timestamp.
 156          *
 157          * @return string
 158          * @deprecated Use getRevision() for more flexible information
 159          */
 160         function getRevisionText( $timestamp ) {
 161                 $rev = $this->getRevision( $timestamp );
 162                 return $rev ? $rev->getText() : null;
 163         }
 164
 165         /**
 166          * Return a Revision object containing data for the deleted revision.
 167          * Note that the result *may* or *may not* have a null page ID.
 168          * @param string $timestamp
 169          * @return Revision
 170          */
 171         function getRevision( $timestamp ) {
 172                 $dbr = wfGetDB( DB_SLAVE );
 173                 $row = $dbr->selectRow( 'archive',
 174                         array(
 175                                 'ar_rev_id',
 176                                 'ar_text',
 177                                 'ar_comment',
 178                                 'ar_user',
 179                                 'ar_user_text',
 180                                 'ar_timestamp',
 181                                 'ar_minor_edit',
 182                                 'ar_flags',
 183                                 'ar_text_id',
 184                                 'ar_deleted',
 185                                 'ar_len' ),
 186                         array( 'ar_namespace' => $this->title->getNamespace(),
 187                                'ar_title' => $this->title->getDBkey(),
 188                                'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 189                         __METHOD__ );
 190                 if( $row ) {
 191                         return new Revision( array(
 192                                 'page'       => $this->title->getArticleId(),
 193                                 'id'         => $row->ar_rev_id,
 194                                 'text'       => ($row->ar_text_id
 195                                         ? null
 196                                         : Revision::getRevisionText( $row, 'ar_' ) ),
 197                                 'comment'    => $row->ar_comment,
 198                                 'user'       => $row->ar_user,
 199                                 'user_text'  => $row->ar_user_text,
 200                                 'timestamp'  => $row->ar_timestamp,
 201                                 'minor_edit' => $row->ar_minor_edit,
 202                                 'text_id'    => $row->ar_text_id,
 203                                 'deleted'    => $row->ar_deleted,
 204                                 'len'        => $row->ar_len) );
 205                 } else {
 206                         return null;
 207                 }
 208         }
 209
 210         /**
 211          * Return the most-previous revision, either live or deleted, against
 212          * the deleted revision given by timestamp.
 213          *
 214          * May produce unexpected results in case of history merges or other
 215          * unusual time issues.
 216          *
 217          * @param string $timestamp
 218          * @return Revision or null
 219          */
 220         function getPreviousRevision( $timestamp ) {
 221                 $dbr = wfGetDB( DB_SLAVE );
 222
 223                 // Check the previous deleted revision...
 224                 $row = $dbr->selectRow( 'archive',
 225                         'ar_timestamp',
 226                         array( 'ar_namespace' => $this->title->getNamespace(),
 227                                'ar_title' => $this->title->getDBkey(),
 228                                'ar_timestamp < ' .
 229                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 230                         __METHOD__,
 231                         array(
 232                                 'ORDER BY' => 'ar_timestamp DESC',
 233                                 'LIMIT' => 1 ) );
 234                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 235
 236                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 237                         array( 'rev_id', 'rev_timestamp' ),
 238                         array(
 239                                 'page_namespace' => $this->title->getNamespace(),
 240                                 'page_title' => $this->title->getDBkey(),
 241                                 'page_id = rev_page',
 242                                 'rev_timestamp < ' .
 243                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 244                         __METHOD__,
 245                         array(
 246                                 'ORDER BY' => 'rev_timestamp DESC',
 247                                 'LIMIT' => 1 ) );
 248                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 249                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 250
 251                 if( $prevLive && $prevLive > $prevDeleted ) {
 252                         // Most prior revision was live
 253                         return Revision::newFromId( $prevLiveId );
 254                 } elseif( $prevDeleted ) {
 255                         // Most prior revision was deleted
 256                         return $this->getRevision( $prevDeleted );
 257                 } else {
 258                         // No prior revision on this page.
 259                         return null;
 260                 }
 261         }
 262
 263         /**
 264          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 265          */
 266         function getTextFromRow( $row ) {
 267                 if( is_null( $row->ar_text_id ) ) {
 268                         // An old row from MediaWiki 1.4 or previous.
 269                         // Text is embedded in this row in classic compression format.
 270                         return Revision::getRevisionText( $row, "ar_" );
 271                 } else {
 272                         // New-style: keyed to the text storage backend.
 273                         $dbr = wfGetDB( DB_SLAVE );
 274                         $text = $dbr->selectRow( 'text',
 275                                 array( 'old_text', 'old_flags' ),
 276                                 array( 'old_id' => $row->ar_text_id ),
 277                                 __METHOD__ );
 278                         return Revision::getRevisionText( $text );
 279                 }
 280         }
 281
 282
 283         /**
 284          * Fetch (and decompress if necessary) the stored text of the most
 285          * recently edited deleted revision of the page.
 286          *
 287          * If there are no archived revisions for the page, returns NULL.
 288          *
 289          * @return string
 290          */
 291         function getLastRevisionText() {
 292                 $dbr = wfGetDB( DB_SLAVE );
 293                 $row = $dbr->selectRow( 'archive',
 294                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 295                         array( 'ar_namespace' => $this->title->getNamespace(),
 296                                'ar_title' => $this->title->getDBkey() ),
 297                         'PageArchive::getLastRevisionText',
 298                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 299                 if( $row ) {
 300                         return $this->getTextFromRow( $row );
 301                 } else {
 302                         return NULL;
 303                 }
 304         }
 305
 306         /**
 307          * Quick check if any archived revisions are present for the page.
 308          * @return bool
 309          */
 310         function isDeleted() {
 311                 $dbr = wfGetDB( DB_SLAVE );
 312                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 313                         array( 'ar_namespace' => $this->title->getNamespace(),
 314                                'ar_title' => $this->title->getDBkey() ) );
 315                 return ($n > 0);
 316         }
 317
 318         /**
 319          * Restore the given (or all) text and file revisions for the page.
 320          * Once restored, the items will be removed from the archive tables.
 321          * The deletion log will be updated with an undeletion notice.
 322          *
 323          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 324          * @param string $comment
 325          * @param array $fileVersions
 326          * @param bool $unsuppress
 327          *
 328          * @return array(number of file revisions restored, number of image revisions restored, log message)
 329          * on success, false on failure
 330          */
 331         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 332                 // If both the set of text revisions and file revisions are empty,
 333                 // restore everything. Otherwise, just restore the requested items.
 334                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 335
 336                 $restoreText = $restoreAll || !empty( $timestamps );
 337                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 338
 339                 if( $restoreFiles && $this->title->getNamespace() == NS_IMAGE ) {
 340                         $img = wfLocalFile( $this->title );
 341                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 342                         $filesRestored = $this->fileStatus->successCount;
 343                 } else {
 344                         $filesRestored = 0;
 345                 }
 346
 347                 if( $restoreText ) {
 348                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress );
 349                         if($textRestored === false) // It must be one of UNDELETE_*
 350                                 return false;
 351                 } else {
 352                         $textRestored = 0;
 353                 }
 354
 355                 // Touch the log!
 356                 global $wgContLang;
 357                 $log = new LogPage( 'delete' );
 358
 359                 if( $textRestored && $filesRestored ) {
 360                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 361                                 $wgContLang->formatNum( $textRestored ),
 362                                 $wgContLang->formatNum( $filesRestored ) );
 363                 } elseif( $textRestored ) {
 364                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 365                                 $wgContLang->formatNum( $textRestored ) );
 366                 } elseif( $filesRestored ) {
 367                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 368                                 $wgContLang->formatNum( $filesRestored ) );
 369                 } else {
 370                         wfDebug( "Undelete: nothing undeleted...\n" );
 371                         return false;
 372                 }
 373
 374                 if( trim( $comment ) != '' )
 375                         $reason .= ": {$comment}";
 376                 $log->addEntry( 'restore', $this->title, $reason );
 377
 378                 return array($textRestored, $filesRestored, $reason);
 379         }
 380
 381         /**
 382          * This is the meaty bit -- restores archived revisions of the given page
 383          * to the cur/old tables. If the page currently exists, all revisions will
 384          * be stuffed into old, otherwise the most recent will go into cur.
 385          *
 386          * @param array $timestamps Pass an empty array to restore all revisions, otherwise list the ones to undelete.
 387          * @param string $comment
 388          * @param array $fileVersions
 389          * @param bool $unsuppress, remove all ar_deleted/fa_deleted restrictions of seletected revs
 390          *
 391          * @return mixed number of revisions restored or false on failure
 392          */
 393         private function undeleteRevisions( $timestamps, $unsuppress = false ) {
 394                 if ( wfReadOnly() )
 395                         return false;
 396                 $restoreAll = empty( $timestamps );
 397
 398                 $dbw = wfGetDB( DB_MASTER );
 399
 400                 # Does this page already exist? We'll have to update it...
 401                 $article = new Article( $this->title );
 402                 $options = 'FOR UPDATE';
 403                 $page = $dbw->selectRow( 'page',
 404                         array( 'page_id', 'page_latest' ),
 405                         array( 'page_namespace' => $this->title->getNamespace(),
 406                                'page_title'     => $this->title->getDBkey() ),
 407                         __METHOD__,
 408                         $options );
 409                 if( $page ) {
 410                         $makepage = false;
 411                         # Page already exists. Import the history, and if necessary
 412                         # we'll update the latest revision field in the record.
 413                         $newid             = 0;
 414                         $pageId            = $page->page_id;
 415                         $previousRevId    = $page->page_latest;
 416                         # Get the time span of this page
 417                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 418                                 array( 'rev_id' => $previousRevId ),
 419                                 __METHOD__ );
 420                         if( $previousTimestamp === false ) {
 421                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 422                                 return 0;
 423                         }
 424                 } else {
 425                         # Have to create a new article...
 426                         $makepage = true;
 427                         $previousRevId = 0;
 428                         $previousTimestamp = 0;
 429                 }
 430
 431                 if( $restoreAll ) {
 432                         $oldones = '1 = 1'; # All revisions...
 433                 } else {
 434                         $oldts = implode( ',',
 435                                 array_map( array( &$dbw, 'addQuotes' ),
 436                                         array_map( array( &$dbw, 'timestamp' ),
 437                                                 $timestamps ) ) );
 438
 439                         $oldones = "ar_timestamp IN ( {$oldts} )";
 440                 }
 441
 442                 /**
 443                  * Select each archived revision...
 444                  */
 445                 $result = $dbw->select( 'archive',
 446                         /* fields */ array(
 447                                 'ar_rev_id',
 448                                 'ar_text',
 449                                 'ar_comment',
 450                                 'ar_user',
 451                                 'ar_user_text',
 452                                 'ar_timestamp',
 453                                 'ar_minor_edit',
 454                                 'ar_flags',
 455                                 'ar_text_id',
 456                                 'ar_deleted',
 457                                 'ar_page_id',
 458                                 'ar_len' ),
 459                         /* WHERE */ array(
 460                                 'ar_namespace' => $this->title->getNamespace(),
 461                                 'ar_title'     => $this->title->getDBkey(),
 462                                 $oldones ),
 463                         __METHOD__,
 464                         /* options */ array(
 465                                 'ORDER BY' => 'ar_timestamp' )
 466                         );
 467                 $ret = $dbw->resultObject( $result );
 468
 469                 $rev_count = $dbw->numRows( $result );
 470                 if( $rev_count ) {
 471                         # We need to seek around as just using DESC in the ORDER BY
 472                         # would leave the revisions inserted in the wrong order
 473                         $first = $ret->fetchObject();
 474                         $ret->seek( $rev_count - 1 );
 475                         $last = $ret->fetchObject();
 476                         // We don't handle well changing the top revision's settings
 477                         if( !$unsuppress && $last->ar_deleted && $last->ar_timestamp > $previousTimestamp ) {
 478                                 wfDebug( __METHOD__.": restoration would result in a deleted top revision\n" );
 479                                 return false;
 480                         }
 481                         $ret->seek( 0 );
 482                 }
 483
 484                 if( $makepage ) {
 485                         $newid  = $article->insertOn( $dbw );
 486                         $pageId = $newid;
 487                 }
 488
 489                 $revision = null;
 490                 $restored = 0;
 491
 492                 while( $row = $ret->fetchObject() ) {
 493                         if( $row->ar_text_id ) {
 494                                 // Revision was deleted in 1.5+; text is in
 495                                 // the regular text table, use the reference.
 496                                 // Specify null here so the so the text is
 497                                 // dereferenced for page length info if needed.
 498                                 $revText = null;
 499                         } else {
 500                                 // Revision was deleted in 1.4 or earlier.
 501                                 // Text is squashed into the archive row, and
 502                                 // a new text table entry will be created for it.
 503                                 $revText = Revision::getRevisionText( $row, 'ar_' );
 504                         }
 505                         // Check for key dupes due to shitty archive integrity.
 506                         if( $row->ar_rev_id ) {
 507                                 $exists = $dbw->selectField( 'revision', '1', array('rev_id' => $row->ar_rev_id), __METHOD__ );
 508                                 if( $exists ) continue; // don't throw DB errors
 509                         }
 510
 511                         $revision = new Revision( array(
 512                                 'page'       => $pageId,
 513                                 'id'         => $row->ar_rev_id,
 514                                 'text'       => $revText,
 515                                 'comment'    => $row->ar_comment,
 516                                 'user'       => $row->ar_user,
 517                                 'user_text'  => $row->ar_user_text,
 518                                 'timestamp'  => $row->ar_timestamp,
 519                                 'minor_edit' => $row->ar_minor_edit,
 520                                 'text_id'    => $row->ar_text_id,
 521                                 'deleted'        => $unsuppress ? 0 : $row->ar_deleted,
 522                                 'len'        => $row->ar_len
 523                                 ) );
 524                         $revision->insertOn( $dbw );
 525                         $restored++;
 526
 527                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 528                 }
 529                 # Now that it's safely stored, take it out of the archive
 530                 $dbw->delete( 'archive',
 531                         /* WHERE */ array(
 532                                 'ar_namespace' => $this->title->getNamespace(),
 533                                 'ar_title' => $this->title->getDBkey(),
 534                                 $oldones ),
 535                         __METHOD__ );
 536
 537                 // Was anything restored at all?
 538                 if( $restored == 0 )
 539                         return 0;
 540
 541                 if( $revision ) {
 542                         // Attach the latest revision to the page...
 543                         $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 544
 545                         if( $newid || $wasnew ) {
 546                                 // Update site stats, link tables, etc
 547                                 $article->createUpdates( $revision );
 548                         }
 549
 550                         if( $newid ) {
 551                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, true ) );
 552                                 Article::onArticleCreate( $this->title );
 553                         } else {
 554                                 wfRunHooks( 'ArticleUndelete', array( &$this->title, false ) );
 555                                 Article::onArticleEdit( $this->title );
 556                         }
 557
 558                         if( $this->title->getNamespace() == NS_IMAGE ) {
 559                                 $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 560                                 $update->doUpdate();
 561                         }
 562                 } else {
 563                         // Revision couldn't be created. This is very weird
 564                         return self::UNDELETE_UNKNOWNERR;
 565                 }
 566
 567                 return $restored;
 568         }
 569
 570         function getFileStatus() { return $this->fileStatus; }
 571 }
 572
 573 /**
 574  * The HTML form for Special:Undelete, which allows users with the appropriate
 575  * permissions to view and restore deleted content.
 576  * @ingroup SpecialPage
 577  */
 578 class UndeleteForm {
 579         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mTargetObj;
 580         var $mTargetTimestamp, $mAllowed, $mComment;
 581
 582         function UndeleteForm( $request, $par = "" ) {
 583                 global $wgUser;
 584                 $this->mAction = $request->getVal( 'action' );
 585                 $this->mTarget = $request->getVal( 'target' );
 586                 $this->mSearchPrefix = $request->getText( 'prefix' );
 587                 $time = $request->getVal( 'timestamp' );
 588                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 589                 $this->mFile = $request->getVal( 'file' );
 590
 591                 $posted = $request->wasPosted() &&
 592                         $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 593                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 594                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 595                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 596                 $this->mDiff = $request->getCheck( 'diff' );
 597                 $this->mComment = $request->getText( 'wpComment' );
 598                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
 599
 600                 if( $par != "" ) {
 601                         $this->mTarget = $par;
 602                 }
 603                 if ( $wgUser->isAllowed( 'undelete' ) && !$wgUser->isBlocked() ) {
 604                         $this->mAllowed = true;
 605                 } else {
 606                         $this->mAllowed = false;
 607                         $this->mTimestamp = '';
 608                         $this->mRestore = false;
 609                 }
 610                 if ( $this->mTarget !== "" ) {
 611                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 612                 } else {
 613                         $this->mTargetObj = NULL;
 614                 }
 615                 if( $this->mRestore || $this->mInvert ) {
 616                         $timestamps = array();
 617                         $this->mFileVersions = array();
 618                         foreach( $_REQUEST as $key => $val ) {
 619                                 $matches = array();
 620                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 621                                         array_push( $timestamps, $matches[1] );
 622                                 }
 623
 624                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 625                                         $this->mFileVersions[] = intval( $matches[1] );
 626                                 }
 627                         }
 628                         rsort( $timestamps );
 629                         $this->mTargetTimestamp = $timestamps;
 630                 }
 631         }
 632
 633         function execute() {
 634                 global $wgOut, $wgUser;
 635                 if ( $this->mAllowed ) {
 636                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 637                 } else {
 638                         $wgOut->setPagetitle( wfMsg( "viewdeletedpage" ) );
 639                 }
 640
 641                 if( is_null( $this->mTargetObj ) ) {
 642                 # Not all users can just browse every deleted page from the list
 643                         if( $wgUser->isAllowed( 'browsearchive' ) ) {
 644                                 $this->showSearchForm();
 645
 646                                 # List undeletable articles
 647                                 if( $this->mSearchPrefix ) {
 648                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 649                                         $this->showList( $result );
 650                                 }
 651                         } else {
 652                                 $wgOut->addWikiText( wfMsgHtml( 'undelete-header' ) );
 653                         }
 654                         return;
 655                 }
 656                 if( $this->mTimestamp !== '' ) {
 657                         return $this->showRevision( $this->mTimestamp );
 658                 }
 659                 if( $this->mFile !== null ) {
 660                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFile );
 661                         // Check if user is allowed to see this file
 662                         if( !$file->userCan( File::DELETED_FILE ) ) {
 663                                 $wgOut->permissionRequired( 'suppressrevision' );
 664                                 return false;
 665                         } else {
 666                                 return $this->showFile( $this->mFile );
 667                         }
 668                 }
 669                 if( $this->mRestore && $this->mAction == "submit" ) {
 670                         return $this->undelete();
 671                 }
 672                 if( $this->mInvert && $this->mAction == "submit" ) {
 673                         return $this->showHistory( );
 674                 }
 675                 return $this->showHistory();
 676         }
 677
 678         function showSearchForm() {
 679                 global $wgOut, $wgScript;
 680                 $wgOut->addWikiMsg( 'undelete-header' );
 681
 682                 $wgOut->addHtml(
 683                         Xml::openElement( 'form', array(
 684                                 'method' => 'get',
 685                                 'action' => $wgScript ) ) .
 686                         '<fieldset>' .
 687                         Xml::element( 'legend', array(),
 688                                 wfMsg( 'undelete-search-box' ) ) .
 689                         Xml::hidden( 'title',
 690                                 SpecialPage::getTitleFor( 'Undelete' )->getPrefixedDbKey() ) .
 691                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 692                                 'prefix', 'prefix', 20,
 693                                 $this->mSearchPrefix ) .
 694                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 695                         '</fieldset>' .
 696                         '</form>' );
 697         }
 698
 699         // Generic list of deleted pages
 700         private function showList( $result ) {
 701                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 702
 703                 if( $result->numRows() == 0 ) {
 704                         $wgOut->addWikiMsg( 'undelete-no-results' );
 705                         return;
 706                 }
 707
 708                 $wgOut->addWikiMsg( "undeletepagetext" );
 709
 710                 $sk = $wgUser->getSkin();
 711                 $undelete = SpecialPage::getTitleFor( 'Undelete' );
 712                 $wgOut->addHTML( "<ul>\n" );
 713                 while( $row = $result->fetchObject() ) {
 714                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 715                         $link = $sk->makeKnownLinkObj( $undelete, htmlspecialchars( $title->getPrefixedText() ),
 716                                 'target=' . $title->getPrefixedUrl() );
 717                         #$revs = wfMsgHtml( 'undeleterevisions', $wgLang->formatNum( $row->count ) );
 718                         $revs = wfMsgExt( 'undeleterevisions',
 719                                 array( 'parseinline' ),
 720                                 $wgLang->formatNum( $row->count ) );
 721                         $wgOut->addHtml( "<li>{$link} ({$revs})</li>\n" );
 722                 }
 723                 $result->free();
 724                 $wgOut->addHTML( "</ul>\n" );
 725
 726                 return true;
 727         }
 728
 729         private function showRevision( $timestamp ) {
 730                 global $wgLang, $wgUser, $wgOut;
 731                 $self = SpecialPage::getTitleFor( 'Undelete' );
 732                 $skin = $wgUser->getSkin();
 733
 734                 if(!preg_match("/[0-9]{14}/",$timestamp)) return 0;
 735
 736                 $archive = new PageArchive( $this->mTargetObj );
 737                 $rev = $archive->getRevision( $timestamp );
 738
 739                 if( !$rev ) {
 740                         $wgOut->addWikiMsg( 'undeleterevision-missing' );
 741                         return;
 742                 }
 743
 744                 if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
 745                         if( !$rev->userCan(Revision::DELETED_TEXT) ) {
 746                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 747                                 return;
 748                         } else {
 749                                 $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 750                                 $wgOut->addHTML( '<br/>' );
 751                                 // and we are allowed to see...
 752                         }
 753                 }
 754
 755                 $wgOut->setPageTitle( wfMsg( 'undeletepage' ) );
 756
 757                 $link = $skin->makeKnownLinkObj(
 758                         SpecialPage::getTitleFor( 'Undelete', $this->mTargetObj->getPrefixedDBkey() ),
 759                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 760                 );
 761
 762                 if( $this->mDiff ) {
 763                         $previousRev = $archive->getPreviousRevision( $timestamp );
 764                         if( $previousRev ) {
 765                                 $this->showDiff( $previousRev, $rev );
 766                                 if( $wgUser->getOption( 'diffonly' ) ) {
 767                                         return;
 768                                 } else {
 769                                         $wgOut->addHtml( '<hr />' );
 770                                 }
 771                         } else {
 772                                 $wgOut->addHtml( wfMsgHtml( 'undelete-nodiff' ) );
 773                         }
 774                 }
 775
 776                 // date and time are separate parameters to facilitate localisation.
 777                 // $time is kept for backward compat reasons.
 778                 $time = htmlspecialchars( $wgLang->timeAndDate( $timestamp, true ) );
 779                 $d = htmlspecialchars( $wgLang->date( $timestamp, true ) );
 780                 $t = htmlspecialchars( $wgLang->time( $timestamp, true ) );
 781                 $user = $skin->revUserTools( $rev );
 782
 783                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'undelete-revision', $link, $time, $user, $d, $t ) . '</p>' );
 784
 785                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 786
 787                 if( $this->mPreview ) {
 788                         $wgOut->addHtml( "<hr />\n" );
 789
 790                         //Hide [edit]s
 791                         $popts = $wgOut->parserOptions();
 792                         $popts->setEditSection( false );
 793                         $wgOut->parserOptions( $popts );
 794                         $wgOut->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 795                 }
 796
 797                 $wgOut->addHtml(
 798                         wfElement( 'textarea', array(
 799                                         'readonly' => 'readonly',
 800                                         'cols' => intval( $wgUser->getOption( 'cols' ) ),
 801                                         'rows' => intval( $wgUser->getOption( 'rows' ) ) ),
 802                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 803                         wfOpenElement( 'div' ) .
 804                         wfOpenElement( 'form', array(
 805                                 'method' => 'post',
 806                                 'action' => $self->getLocalURL( "action=submit" ) ) ) .
 807                         wfElement( 'input', array(
 808                                 'type' => 'hidden',
 809                                 'name' => 'target',
 810                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 811                         wfElement( 'input', array(
 812                                 'type' => 'hidden',
 813                                 'name' => 'timestamp',
 814                                 'value' => $timestamp ) ) .
 815                         wfElement( 'input', array(
 816                                 'type' => 'hidden',
 817                                 'name' => 'wpEditToken',
 818                                 'value' => $wgUser->editToken() ) ) .
 819                         wfElement( 'input', array(
 820                                 'type' => 'submit',
 821                                 'name' => 'preview',
 822                                 'value' => wfMsg( 'showpreview' ) ) ) .
 823                         wfElement( 'input', array(
 824                                 'name' => 'diff',
 825                                 'type' => 'submit',
 826                                 'value' => wfMsg( 'showdiff' ) ) ) .
 827                         wfCloseElement( 'form' ) .
 828                         wfCloseElement( 'div' ) );
 829         }
 830
 831         /**
 832          * Build a diff display between this and the previous either deleted
 833          * or non-deleted edit.
 834          * @param Revision $previousRev
 835          * @param Revision $currentRev
 836          * @return string HTML
 837          */
 838         function showDiff( $previousRev, $currentRev ) {
 839                 global $wgOut, $wgUser;
 840
 841                 $diffEngine = new DifferenceEngine();
 842                 $diffEngine->showDiffStyle();
 843                 $wgOut->addHtml(
 844                         "<div>" .
 845                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 846                         "<col class='diff-marker' />" .
 847                         "<col class='diff-content' />" .
 848                         "<col class='diff-marker' />" .
 849                         "<col class='diff-content' />" .
 850                         "<tr>" .
 851                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 852                                 $this->diffHeader( $previousRev ) .
 853                                 "</td>" .
 854                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 855                                 $this->diffHeader( $currentRev ) .
 856                                 "</td>" .
 857                         "</tr>" .
 858                         $diffEngine->generateDiffBody(
 859                                 $previousRev->getText(), $currentRev->getText() ) .
 860                         "</table>" .
 861                         "</div>\n" );
 862
 863         }
 864
 865         private function diffHeader( $rev ) {
 866                 global $wgUser, $wgLang, $wgLang;
 867                 $sk = $wgUser->getSkin();
 868                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 869                 if( $isDeleted ) {
 870                         /// @fixme $rev->getTitle() is null for deleted revs...?
 871                         $targetPage = SpecialPage::getTitleFor( 'Undelete' );
 872                         $targetQuery = 'target=' .
 873                                 $this->mTargetObj->getPrefixedUrl() .
 874                                 '&timestamp=' .
 875                                 wfTimestamp( TS_MW, $rev->getTimestamp() );
 876                 } else {
 877                         /// @fixme getId() may return non-zero for deleted revs...
 878                         $targetPage = $rev->getTitle();
 879                         $targetQuery = 'oldid=' . $rev->getId();
 880                 }
 881                 return
 882                         '<div id="mw-diff-otitle1"><strong>' .
 883                                 $sk->makeLinkObj( $targetPage,
 884                                         wfMsgHtml( 'revisionasof',
 885                                                 $wgLang->timeanddate( $rev->getTimestamp(), true ) ),
 886                                         $targetQuery ) .
 887                                 ( $isDeleted ? ' ' . wfMsgHtml( 'deletedrev' ) : '' ) .
 888                         '</strong></div>' .
 889                         '<div id="mw-diff-otitle2">' .
 890                                 $sk->revUserTools( $rev ) . '<br/>' .
 891                         '</div>' .
 892                         '<div id="mw-diff-otitle3">' .
 893                                 $sk->revComment( $rev ) . '<br/>' .
 894                         '</div>';
 895         }
 896
 897         /**
 898          * Show a deleted file version requested by the visitor.
 899          */
 900         private function showFile( $key ) {
 901                 global $wgOut, $wgRequest;
 902                 $wgOut->disable();
 903
 904                 # We mustn't allow the output to be Squid cached, otherwise
 905                 # if an admin previews a deleted image, and it's cached, then
 906                 # a user without appropriate permissions can toddle off and
 907                 # nab the image, and Squid will serve it
 908                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 909                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 910                 $wgRequest->response()->header( 'Pragma: no-cache' );
 911
 912                 $store = FileStore::get( 'deleted' );
 913                 $store->stream( $key );
 914         }
 915
 916         private function showHistory( ) {
 917                 global $wgLang, $wgUser, $wgOut;
 918
 919                 $sk = $wgUser->getSkin();
 920                 if( $this->mAllowed ) {
 921                         $wgOut->setPagetitle( wfMsg( "undeletepage" ) );
 922                 } else {
 923                         $wgOut->setPagetitle( wfMsg( 'viewdeletedpage' ) );
 924                 }
 925
 926                 $wgOut->addWikiText( wfMsgHtml( 'undeletepagetitle', $this->mTargetObj->getPrefixedText()) );
 927
 928                 $archive = new PageArchive( $this->mTargetObj );
 929                 /*
 930                 $text = $archive->getLastRevisionText();
 931                 if( is_null( $text ) ) {
 932                         $wgOut->addWikiMsg( "nohistory" );
 933                         return;
 934                 }
 935                 */
 936                 if ( $this->mAllowed ) {
 937                         $wgOut->addWikiMsg( "undeletehistory" );
 938                         $wgOut->addWikiMsg( "undeleterevdel" );
 939                 } else {
 940                         $wgOut->addWikiMsg( "undeletehistorynoadmin" );
 941                 }
 942
 943                 # List all stored revisions
 944                 $revisions = $archive->listRevisions();
 945                 $files = $archive->listFiles();
 946
 947                 $haveRevisions = $revisions && $revisions->numRows() > 0;
 948                 $haveFiles = $files && $files->numRows() > 0;
 949
 950                 # Batch existence check on user and talk pages
 951                 if( $haveRevisions ) {
 952                         $batch = new LinkBatch();
 953                         while( $row = $revisions->fetchObject() ) {
 954                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
 955                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
 956                         }
 957                         $batch->execute();
 958                         $revisions->seek( 0 );
 959                 }
 960                 if( $haveFiles ) {
 961                         $batch = new LinkBatch();
 962                         while( $row = $files->fetchObject() ) {
 963                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
 964                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
 965                         }
 966                         $batch->execute();
 967                         $files->seek( 0 );
 968                 }
 969
 970                 if ( $this->mAllowed ) {
 971                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
 972                         $action = $titleObj->getLocalURL( "action=submit" );
 973                         # Start the form here
 974                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
 975                         $wgOut->addHtml( $top );
 976                 }
 977
 978                 # Show relevant lines from the deletion log:
 979                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
 980                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTargetObj->getPrefixedText() );
 981
 982                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
 983                         # Format the user-visible controls (comment field, submission button)
 984                         # in a nice little table
 985                         if( $wgUser->isAllowed( 'suppressrevision' ) ) {
 986                                 $unsuppressBox =
 987                                         "<tr>
 988                                                 <td>&nbsp;</td>
 989                                                 <td class='mw-input'>" .
 990                                                         Xml::checkLabel( wfMsg('revdelete-unsuppress'), 'wpUnsuppress',
 991                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
 992                                                 "</td>
 993                                         </tr>";
 994                         } else {
 995                                 $unsuppressBox = "";
 996                         }
 997                         $table =
 998                                 Xml::openElement( 'fieldset' ) .
 999                                 Xml::element( 'legend', null, wfMsg( 'undelete-fieldset-title' ) ).
1000                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1001                                         "<tr>
1002                                                 <td colspan='2'>" .
1003                                                         wfMsgWikiHtml( 'undeleteextrahelp' ) .
1004                                                 "</td>
1005                                         </tr>
1006                                         <tr>
1007                                                 <td class='mw-label'>" .
1008                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1009                                                 "</td>
1010                                                 <td class='mw-input'>" .
1011                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1012                                                 "</td>
1013                                         </tr>
1014                                         <tr>
1015                                                 <td>&nbsp;</td>
1016                                                 <td class='mw-submit'>" .
1017                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) .
1018                                                         Xml::element( 'input', array( 'type' => 'reset', 'value' => wfMsg( 'undeletereset' ), 'id' => 'mw-undelete-reset' ) ) .
1019                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1020                                                 "</td>
1021                                         </tr>" .
1022                                         $unsuppressBox .
1023                                 Xml::closeElement( 'table' ) .
1024                                 Xml::closeElement( 'fieldset' );
1025
1026                         $wgOut->addHtml( $table );
1027                 }
1028
1029                 $wgOut->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1030
1031                 if( $haveRevisions ) {
1032                         # The page's stored (deleted) history:
1033                         $wgOut->addHTML("<ul>");
1034                         $target = urlencode( $this->mTarget );
1035                         $remaining = $revisions->numRows();
1036                         $earliestLiveTime = $this->getEarliestTime( $this->mTargetObj );
1037
1038                         while( $row = $revisions->fetchObject() ) {
1039                                 $remaining--;
1040                                 $wgOut->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) );
1041                         }
1042                         $revisions->free();
1043                         $wgOut->addHTML("</ul>");
1044                 } else {
1045                         $wgOut->addWikiMsg( "nohistory" );
1046                 }
1047
1048                 if( $haveFiles ) {
1049                         $wgOut->addHtml( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1050                         $wgOut->addHtml( "<ul>" );
1051                         while( $row = $files->fetchObject() ) {
1052                                 $wgOut->addHTML( $this->formatFileRow( $row, $sk ) );
1053                         }
1054                         $files->free();
1055                         $wgOut->addHTML( "</ul>" );
1056                 }
1057
1058                 if ( $this->mAllowed ) {
1059                         # Slip in the hidden controls here
1060                         $misc  = Xml::hidden( 'target', $this->mTarget );
1061                         $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
1062                         $misc .= Xml::closeElement( 'form' );
1063                         $wgOut->addHtml( $misc );
1064                 }
1065
1066                 return true;
1067         }
1068
1069         private function formatRevisionRow( $row, $earliestLiveTime, $remaining, $sk ) {
1070                 global $wgUser, $wgLang;
1071
1072                 $rev = new Revision( array(
1073                                 'page'       => $this->mTargetObj->getArticleId(),
1074                                 'comment'    => $row->ar_comment,
1075                                 'user'       => $row->ar_user,
1076                                 'user_text'  => $row->ar_user_text,
1077                                 'timestamp'  => $row->ar_timestamp,
1078                                 'minor_edit' => $row->ar_minor_edit,
1079                                 'deleted'    => $row->ar_deleted,
1080                                 'len'        => $row->ar_len ) );
1081
1082                 $stxt = '';
1083                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1084                 if( $this->mAllowed ) {
1085                         if( $this->mInvert){
1086                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1087                                         $checkBox = Xml::check( "ts$ts");
1088                                 } else {
1089                                         $checkBox = Xml::check( "ts$ts", true );
1090                                 }
1091                         } else {
1092                                 $checkBox = Xml::check( "ts$ts" );
1093                         }
1094                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1095                         $pageLink = $this->getPageLink( $rev, $titleObj, $ts, $sk );
1096                         # Last link
1097                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1098                                 $last = wfMsgHtml('diff');
1099                         } else if( $remaining > 0 || ($earliestLiveTime && $ts > $earliestLiveTime) ) {
1100                                 $last = $sk->makeKnownLinkObj( $titleObj, wfMsgHtml('diff'),
1101                                         "target=" . $this->mTargetObj->getPrefixedUrl() . "&timestamp=$ts&diff=prev" );
1102                         } else {
1103                                 $last = wfMsgHtml('diff');
1104                         }
1105                 } else {
1106                         $checkBox = '';
1107                         $pageLink = $wgLang->timeanddate( $ts, true );
1108                         $last = wfMsgHtml('diff');
1109                 }
1110                 $userLink = $sk->revUserTools( $rev );
1111
1112                 if(!is_null($size = $row->ar_len)) {
1113                         $stxt = $sk->formatRevisionSize( $size );
1114                 }
1115                 $comment = $sk->revComment( $rev );
1116                 $revdlink = '';
1117                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1118                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1119                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
1120                         // If revision was hidden from sysops
1121                                 $del = wfMsgHtml('rev-delundel');
1122                         } else {
1123                                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1124                                 $del = $sk->makeKnownLinkObj( $revdel,
1125                                         wfMsgHtml('rev-delundel'),
1126                                         'target=' . $this->mTargetObj->getPrefixedUrl() . "&artimestamp=$ts" );
1127                                 // Bolden oversighted content
1128                                 if( $rev->isDeleted( Revision::DELETED_RESTRICTED ) )
1129                                         $del = "<strong>$del</strong>";
1130                         }
1131                         $revdlink = "<tt>(<small>$del</small>)</tt>";
1132                 }
1133
1134                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1135         }
1136
1137         private function formatFileRow( $row, $sk ) {
1138                 global $wgUser, $wgLang;
1139
1140                 $file = ArchivedFile::newFromRow( $row );
1141
1142                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1143                 if( $this->mAllowed && $row->fa_storage_key ) {
1144                         $checkBox = Xml::check( "fileid" . $row->fa_id );
1145                         $key = urlencode( $row->fa_storage_key );
1146                         $target = urlencode( $this->mTarget );
1147                         $titleObj = SpecialPage::getTitleFor( "Undelete" );
1148                         $pageLink = $this->getFileLink( $file, $titleObj, $ts, $key, $sk );
1149                 } else {
1150                         $checkBox = '';
1151                         $pageLink = $wgLang->timeanddate( $ts, true );
1152                 }
1153                 $userLink = $this->getFileUser( $file, $sk );
1154                 $data =
1155                         wfMsg( 'widthheight',
1156                                 $wgLang->formatNum( $row->fa_width ),
1157                                 $wgLang->formatNum( $row->fa_height ) ) .
1158                         ' (' .
1159                         wfMsg( 'nbytes', $wgLang->formatNum( $row->fa_size ) ) .
1160                         ')';
1161                 $data = htmlspecialchars( $data );
1162                 $comment = $this->getFileComment( $file, $sk );
1163                 $revdlink = '';
1164                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
1165                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1166                         if( !$file->userCan(File::DELETED_RESTRICTED ) ) {
1167                         // If revision was hidden from sysops
1168                                 $del = wfMsgHtml('rev-delundel');
1169                         } else {
1170                                 $del = $sk->makeKnownLinkObj( $revdel,
1171                                         wfMsgHtml('rev-delundel'),
1172                                         'target=' . $this->mTargetObj->getPrefixedUrl() .
1173                                         '&fileid=' . $row->fa_id );
1174                                 // Bolden oversighted content
1175                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) )
1176                                         $del = "<strong>$del</strong>";
1177                         }
1178                         $revdlink = "<tt>(<small>$del</small>)</tt>";
1179                 }
1180                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1181         }
1182
1183         private function getEarliestTime( $title ) {
1184                 $dbr = wfGetDB( DB_SLAVE );
1185                 if( $title->exists() ) {
1186                         $min = $dbr->selectField( 'revision',
1187                                 'MIN(rev_timestamp)',
1188                                 array( 'rev_page' => $title->getArticleId() ),
1189                                 __METHOD__ );
1190                         return wfTimestampOrNull( TS_MW, $min );
1191                 }
1192                 return null;
1193         }
1194
1195         /**
1196          * Fetch revision text link if it's available to all users
1197          * @return string
1198          */
1199         function getPageLink( $rev, $titleObj, $ts, $sk ) {
1200                 global $wgLang;
1201
1202                 if( !$rev->userCan(Revision::DELETED_TEXT) ) {
1203                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1204                 } else {
1205                         $link = $sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ),
1206                                 "target=".$this->mTargetObj->getPrefixedUrl()."&timestamp=$ts" );
1207                         if( $rev->isDeleted(Revision::DELETED_TEXT) )
1208                                 $link = '<span class="history-deleted">' . $link . '</span>';
1209                         return $link;
1210                 }
1211         }
1212
1213         /**
1214          * Fetch image view link if it's available to all users
1215          * @return string
1216          */
1217         function getFileLink( $file, $titleObj, $ts, $key, $sk ) {
1218                 global $wgLang;
1219
1220                 if( !$file->userCan(File::DELETED_FILE) ) {
1221                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
1222                 } else {
1223                         $link = $sk->makeKnownLinkObj( $titleObj, $wgLang->timeanddate( $ts, true ),
1224                                 "target=".$this->mTargetObj->getPrefixedUrl()."&file=$key" );
1225                         if( $file->isDeleted(File::DELETED_FILE) )
1226                                 $link = '<span class="history-deleted">' . $link . '</span>';
1227                         return $link;
1228                 }
1229         }
1230
1231         /**
1232          * Fetch file's user id if it's available to this user
1233          * @return string
1234          */
1235         function getFileUser( $file, $sk ) {
1236                 if( !$file->userCan(File::DELETED_USER) ) {
1237                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1238                 } else {
1239                         $link = $sk->userLink( $file->getUser(), $file->getUserText() ) .
1240                                 $sk->userToolLinks( $file->getUser(), $file->getUserText() );
1241                         if( $file->isDeleted(File::DELETED_USER) )
1242                                 $link = '<span class="history-deleted">' . $link . '</span>';
1243                         return $link;
1244                 }
1245         }
1246
1247         /**
1248          * Fetch file upload comment if it's available to this user
1249          * @return string
1250          */
1251         function getFileComment( $file, $sk ) {
1252                 if( !$file->userCan(File::DELETED_COMMENT) ) {
1253                         return '<span class="history-deleted"><span class="comment">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1254                 } else {
1255                         $link = $sk->commentBlock( $file->getRawDescription() );
1256                         if( $file->isDeleted(File::DELETED_COMMENT) )
1257                                 $link = '<span class="history-deleted">' . $link . '</span>';
1258                         return $link;
1259                 }
1260         }
1261
1262         function undelete() {
1263                 global $wgOut, $wgUser;
1264                 if ( wfReadOnly() ) {
1265                         $wgOut->readOnlyPage();
1266                         return;
1267                 }
1268                 if( !is_null( $this->mTargetObj ) ) {
1269                         $archive = new PageArchive( $this->mTargetObj );
1270                         $ok = $archive->undelete(
1271                                 $this->mTargetTimestamp,
1272                                 $this->mComment,
1273                                 $this->mFileVersions,
1274                                 $this->mUnsuppress );
1275
1276                         if( is_array($ok) ) {
1277                                 if ( $ok[1] ) // Undeleted file count
1278                                         wfRunHooks( 'FileUndeleteComplete', array(
1279                                                 $this->mTargetObj, $this->mFileVersions,
1280                                                 $wgUser, $this->mComment) );
1281
1282                                 $skin = $wgUser->getSkin();
1283                                 $link = $skin->makeKnownLinkObj( $this->mTargetObj );
1284                                 $wgOut->addHtml( wfMsgWikiHtml( 'undeletedpage', $link ) );
1285                         } else {
1286                                 $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1287                                 $wgOut->addHtml( '<p>' . wfMsgHtml( "undeleterevdel" ) . '</p>' );
1288                         }
1289
1290                         // Show file deletion warnings and errors
1291                         $status = $archive->getFileStatus();
1292                         if( $status && !$status->isGood() ) {
1293                                 $wgOut->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1294                         }
1295                 } else {
1296                         $wgOut->showFatalError( wfMsg( "cannotundelete" ) );
1297                 }
1298                 return false;
1299         }
1300 }