includes/specials/SpecialRevisiondelete.php

   1 <?php
   2 /**
   3  * Special page allowing users with the appropriate permissions to view
   4  * and hide revisions. Log items can also be hidden.
   5  *
   6  * @file
   7  * @ingroup SpecialPage
   8  */
   9
  10 class SpecialRevisionDelete extends UnlistedSpecialPage {
  11         /** Skin object */
  12         var $skin;
  13
  14         /** True if the submit button was clicked, and the form was posted */
  15         var $submitClicked;
  16
  17         /** Target ID list */
  18         var $ids;
  19
  20         /** Archive name, for reviewing deleted files */
  21         var $archiveName;
  22
  23         /** Edit token for securing image views against XSS */
  24         var $token;
  25
  26         /** Title object for target parameter */
  27         var $targetObj;
  28
  29         /** Deletion type, may be revision, archive, oldimage, filearchive, logging. */
  30         var $typeName;
  31
  32         /** Array of checkbox specs (message, name, deletion bits) */
  33         var $checks;
  34
  35         /** Information about the current type */
  36         var $typeInfo;
  37
  38         /** The RevDel_List object, storing the list of items to be deleted/undeleted */
  39         var $list;
  40
  41         /**
  42          * Assorted information about each type, needed by the special page.
  43          * TODO Move some of this to the list class
  44          */
  45         static $allowedTypes = array(
  46                 'revision' => array(
  47                         'check-label' => 'revdelete-hide-text',
  48                         'deletion-bits' => Revision::DELETED_TEXT,
  49                         'success' => 'revdelete-success',
  50                         'failure' => 'revdelete-failure',
  51                         'list-class' => 'RevDel_RevisionList',
  52                 ),
  53                 'archive' => array(
  54                         'check-label' => 'revdelete-hide-text',
  55                         'deletion-bits' => Revision::DELETED_TEXT,
  56                         'success' => 'revdelete-success',
  57                         'failure' => 'revdelete-failure',
  58                         'list-class' => 'RevDel_ArchiveList',
  59                 ),
  60                 'oldimage'=> array(
  61                         'check-label' => 'revdelete-hide-image',
  62                         'deletion-bits' => File::DELETED_FILE,
  63                         'success' => 'revdelete-success',
  64                         'failure' => 'revdelete-failure',
  65                         'list-class' => 'RevDel_FileList',
  66                 ),
  67                 'filearchive' => array(
  68                         'check-label' => 'revdelete-hide-image',
  69                         'deletion-bits' => File::DELETED_FILE,
  70                         'success' => 'revdelete-success',
  71                         'failure' => 'revdelete-failure',
  72                         'list-class' => 'RevDel_ArchivedFileList',
  73                 ),
  74                 'logging' => array(
  75                         'check-label' => 'revdelete-hide-name',
  76                         'deletion-bits' => LogPage::DELETED_ACTION,
  77                         'success' => 'logdelete-success',
  78                         'failure' => 'logdelete-failure',
  79                         'list-class' => 'RevDel_LogList',
  80                 ),
  81         );
  82
  83         /** Type map to support old log entries */
  84         static $deprecatedTypeMap = array(
  85                 'oldid' => 'revision',
  86                 'artimestamp' => 'archive',
  87                 'oldimage' => 'oldimage',
  88                 'fileid' => 'filearchive',
  89                 'logid' => 'logging',
  90         );
  91
  92         public function __construct() {
  93                 parent::__construct( 'Revisiondelete', 'deletedhistory' );
  94         }
  95
  96         public function execute( $par ) {
  97                 global $wgOut, $wgUser, $wgRequest;
  98                 if( !$wgUser->isAllowed( 'deletedhistory' ) ) {
  99                         $wgOut->permissionRequired( 'deletedhistory' );
 100                         return;
 101                 } else if( wfReadOnly() ) {
 102                         $wgOut->readOnlyPage();
 103                         return;
 104                 }
 105                 $this->mIsAllowed = $wgUser->isAllowed('deleterevision'); // for changes
 106                 $this->skin = $wgUser->getSkin();
 107                 $this->setHeaders();
 108                 $this->outputHeader();
 109                 $this->submitClicked = $wgRequest->wasPosted() && $wgRequest->getBool( 'wpSubmit' );
 110                 # Handle our many different possible input types.
 111                 $ids = $wgRequest->getVal( 'ids' );
 112                 if ( !is_null( $ids ) ) {
 113                         # Allow CSV, for backwards compatibility, or a single ID for show/hide links
 114                         $this->ids = explode( ',', $ids );
 115                 } else {
 116                         # Array input
 117                         $this->ids = array_keys( $wgRequest->getArray('ids',array()) );
 118                 }
 119                 // $this->ids = array_map( 'intval', $this->ids );
 120                 $this->ids = array_unique( array_filter( $this->ids ) );
 121
 122                 if ( $wgRequest->getVal( 'action' ) == 'historysubmit' ) {
 123                         # For show/hide form submission from history page
 124                         $this->targetObj = $GLOBALS['wgTitle'];
 125                         $this->typeName = 'revision';
 126                 } else {
 127                         $this->typeName = $wgRequest->getVal( 'type' );
 128                         $this->targetObj = Title::newFromText( $wgRequest->getText( 'target' ) );
 129                 }
 130
 131                 # For reviewing deleted files...
 132                 $this->archiveName = $wgRequest->getVal( 'file' );
 133                 $this->token = $wgRequest->getVal( 'token' );
 134                 if ( $this->archiveName && $this->targetObj ) {
 135                         $this->tryShowFile( $this->archiveName );
 136                         return;
 137                 }
 138
 139                 if ( isset( self::$deprecatedTypeMap[$this->typeName] ) ) {
 140                         $this->typeName = self::$deprecatedTypeMap[$this->typeName];
 141                 }
 142
 143                 # No targets?
 144                 if( !isset( self::$allowedTypes[$this->typeName] ) || count( $this->ids ) == 0 ) {
 145                         $wgOut->showErrorPage( 'revdelete-nooldid-title', 'revdelete-nooldid-text' );
 146                         return;
 147                 }
 148                 $this->typeInfo = self::$allowedTypes[$this->typeName];
 149
 150                 # If we have revisions, get the title from the first one
 151                 # since they should all be from the same page. This allows
 152                 # for more flexibility with page moves...
 153                 if( $this->typeName == 'revision' ) {
 154                         $rev = Revision::newFromId( $this->ids[0] );
 155                         $this->targetObj = $rev ? $rev->getTitle() : $this->targetObj;
 156                 }
 157
 158                 $this->otherReason = $wgRequest->getVal( 'wpReason' );
 159                 # We need a target page!
 160                 if( is_null($this->targetObj) ) {
 161                         $wgOut->addWikiMsg( 'undelete-header' );
 162                         return;
 163                 }
 164                 # Give a link to the logs/hist for this page
 165                 $this->showConvenienceLinks();
 166
 167                 # Initialise checkboxes
 168                 $this->checks = array(
 169                         array( $this->typeInfo['check-label'], 'wpHidePrimary', $this->typeInfo['deletion-bits'] ),
 170                         array( 'revdelete-hide-comment', 'wpHideComment', Revision::DELETED_COMMENT ),
 171                         array( 'revdelete-hide-user', 'wpHideUser', Revision::DELETED_USER )
 172                 );
 173                 if( $wgUser->isAllowed('suppressrevision') ) {
 174                         $this->checks[] = array( 'revdelete-hide-restricted',
 175                                 'wpHideRestricted', Revision::DELETED_RESTRICTED );
 176                 }
 177
 178                 # Either submit or create our form
 179                 if( $this->mIsAllowed && $this->submitClicked ) {
 180                         $this->submit( $wgRequest );
 181                 } else {
 182                         $this->showForm();
 183                 }
 184
 185                 $qc = $this->getLogQueryCond();
 186                 # Show relevant lines from the deletion log
 187                 $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'delete' ) ) . "</h2>\n" );
 188                 LogEventsList::showLogExtract( $wgOut, 'delete',
 189                         $this->targetObj->getPrefixedText(), '', array( 'lim' => 25, 'conds' => $qc ) );
 190                 # Show relevant lines from the suppression log
 191                 if( $wgUser->isAllowed( 'suppressionlog' ) ) {
 192                         $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'suppress' ) ) . "</h2>\n" );
 193                         LogEventsList::showLogExtract( $wgOut, 'suppress',
 194                                 $this->targetObj->getPrefixedText(), '', array( 'lim' => 25, 'conds' => $qc ) );
 195                 }
 196         }
 197
 198         /**
 199          * Show some useful links in the subtitle
 200          */
 201         protected function showConvenienceLinks() {
 202                 global $wgOut, $wgUser, $wgLang;
 203                 # Give a link to the logs/hist for this page
 204                 if( $this->targetObj ) {
 205                         $links = array();
 206                         $links[] = $this->skin->linkKnown(
 207                                 SpecialPage::getTitleFor( 'Log' ),
 208                                 wfMsgHtml( 'viewpagelogs' ),
 209                                 array(),
 210                                 array( 'page' => $this->targetObj->getPrefixedText() )
 211                         );
 212                         if ( $this->targetObj->getNamespace() != NS_SPECIAL ) {
 213                                 # Give a link to the page history
 214                                 $links[] = $this->skin->linkKnown(
 215                                         $this->targetObj,
 216                                         wfMsgHtml( 'pagehist' ),
 217                                         array(),
 218                                         array( 'action' => 'history' )
 219                                 );
 220                                 # Link to deleted edits
 221                                 if( $wgUser->isAllowed('undelete') ) {
 222                                         $undelete = SpecialPage::getTitleFor( 'Undelete' );
 223                                         $links[] = $this->skin->linkKnown(
 224                                                 $undelete,
 225                                                 wfMsgHtml( 'deletedhist' ),
 226                                                 array(),
 227                                                 array( 'target' => $this->targetObj->getPrefixedDBkey() )
 228                                         );
 229                                 }
 230                         }
 231                         # Logs themselves don't have histories or archived revisions
 232                         $wgOut->setSubtitle( '<p>' . $wgLang->pipeList( $links ) . '</p>' );
 233                 }
 234         }
 235
 236         /**
 237          * Get the condition used for fetching log snippets
 238          */
 239         protected function getLogQueryCond() {
 240                 $conds = array();
 241                 // Revision delete logs for these item
 242                 $conds['log_type'] = array('delete','suppress');
 243                 $conds['log_action'] = $this->getList()->getLogAction();
 244                 $conds['ls_field'] = RevisionDeleter::getRelationType( $this->typeName );
 245                 $conds['ls_value'] = $this->ids;
 246                 return $conds;
 247         }
 248
 249         /**
 250          * Show a deleted file version requested by the visitor.
 251          * TODO Mostly copied from Special:Undelete. Refactor.
 252          */
 253         protected function tryShowFile( $archiveName ) {
 254                 global $wgOut, $wgRequest, $wgUser, $wgLang;
 255
 256                 $repo = RepoGroup::singleton()->getLocalRepo();
 257                 $oimage = $repo->newFromArchiveName( $this->targetObj, $archiveName );
 258                 $oimage->load();
 259                 // Check if user is allowed to see this file
 260                 if ( !$oimage->exists() ) {
 261                         $wgOut->addWikiMsg( 'revdelete-no-file' );
 262                         return;
 263                 }
 264                 if( !$oimage->userCan(File::DELETED_FILE) ) {
 265                         if( $oimage->isDeleted( File::DELETED_RESTRICTED ) ) {
 266                                 $wgOut->permissionRequired( 'suppressrevision' );
 267                         } else {
 268                                 $wgOut->permissionRequired( 'deletedtext' );
 269                         }
 270                         return;
 271                 }
 272                 if ( !$wgUser->matchEditToken( $this->token, $archiveName ) ) {
 273                         $wgOut->addWikiMsg( 'revdelete-show-file-confirm',
 274                                 $this->targetObj->getText(),
 275                                 $wgLang->date( $oimage->getTimestamp() ),
 276                                 $wgLang->time( $oimage->getTimestamp() ) );
 277                         $wgOut->addHTML(
 278                                 Xml::openElement( 'form', array(
 279                                         'method' => 'POST',
 280                                         'action' => $this->getTitle()->getLocalUrl(
 281                                                 'target=' . urlencode( $oimage->getName() ) .
 282                                                 '&file=' . urlencode( $archiveName ) .
 283                                                 '&token=' . urlencode( $wgUser->editToken( $archiveName ) ) )
 284                                         )
 285                                 ) .
 286                                 Xml::submitButton( wfMsg( 'revdelete-show-file-submit' ) ) .
 287                                 '</form>'
 288                         );
 289                         return;
 290                 }
 291                 $wgOut->disable();
 292                 # We mustn't allow the output to be Squid cached, otherwise
 293                 # if an admin previews a deleted image, and it's cached, then
 294                 # a user without appropriate permissions can toddle off and
 295                 # nab the image, and Squid will serve it
 296                 $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 297                 $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 298                 $wgRequest->response()->header( 'Pragma: no-cache' );
 299
 300                 # Stream the file to the client
 301                 global $IP;
 302                 require_once( "$IP/includes/StreamFile.php" );
 303                 $key = $oimage->getStorageKey();
 304                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
 305                 wfStreamFile( $path );
 306         }
 307
 308         /**
 309          * Get the list object for this request
 310          */
 311         protected function getList() {
 312                 if ( is_null( $this->list ) ) {
 313                         $class = $this->typeInfo['list-class'];
 314                         $this->list = new $class( $this, $this->targetObj, $this->ids );
 315                 }
 316                 return $this->list;
 317         }
 318
 319         /**
 320          * Show a list of items that we will operate on, and show a form with checkboxes
 321          * which will allow the user to choose new visibility settings.
 322          */
 323         protected function showForm() {
 324                 global $wgOut, $wgUser, $wgLang;
 325                 $UserAllowed = true;
 326
 327                 if ( $this->typeName == 'logging' ) {
 328                         $wgOut->addWikiMsg( 'logdelete-selected', $wgLang->formatNum( count($this->ids) ) );
 329                 } else {
 330                         $wgOut->addWikiMsg( 'revdelete-selected',
 331                                 $this->targetObj->getPrefixedText(), count( $this->ids ) );
 332                 }
 333
 334                 $wgOut->addHTML( "<ul>" );
 335
 336                 $where = $revObjs = array();
 337
 338                 $numRevisions = 0;
 339                 // Live revisions...
 340                 $list = $this->getList();
 341                 for ( $list->reset(); $list->current(); $list->next() ) {
 342                         $item = $list->current();
 343                         if ( !$item->canView() ) {
 344                                 if( !$this->submitClicked ) {
 345                                         $wgOut->permissionRequired( 'suppressrevision' );
 346                                         return;
 347                                 }
 348                                 $UserAllowed = false;
 349                         }
 350                         $numRevisions++;
 351                         $wgOut->addHTML( $item->getHTML() );
 352                 }
 353
 354                 if( !$numRevisions ) {
 355                         $wgOut->showErrorPage( 'revdelete-nooldid-title', 'revdelete-nooldid-text' );
 356                         return;
 357                 }
 358
 359                 $wgOut->addHTML( "</ul>" );
 360                 // Explanation text
 361                 $this->addUsageText();
 362
 363                 // Normal sysops can always see what they did, but can't always change it
 364                 if( !$UserAllowed ) return;
 365
 366                 // Show form if the user can submit
 367                 if( $this->mIsAllowed ) {
 368                         $out = Xml::openElement( 'form', array( 'method' => 'post',
 369                                         'action' => $this->getTitle()->getLocalUrl( array( 'action' => 'submit' ) ),
 370                                         'id' => 'mw-revdel-form-revisions' ) ) .
 371                                 Xml::fieldset( wfMsg( 'revdelete-legend' ) ) .
 372                                 $this->buildCheckBoxes() .
 373                                 Xml::openElement( 'table' ) .
 374                                 "<tr>\n" .
 375                                         '<td class="mw-label">' .
 376                                                 Xml::label( wfMsg( 'revdelete-log' ), 'wpRevDeleteReasonList' ) .
 377                                         '</td>' .
 378                                         '<td class="mw-input">' .
 379                                                 Xml::listDropDown( 'wpRevDeleteReasonList',
 380                                                         wfMsgForContent( 'revdelete-reason-dropdown' ),
 381                                                         wfMsgForContent( 'revdelete-reasonotherlist' ), '', 'wpReasonDropDown', 1
 382                                                 ) .
 383                                         '</td>' .
 384                                 "</tr><tr>\n" .
 385                                         '<td class="mw-label">' .
 386                                                 Xml::label( wfMsg( 'revdelete-otherreason' ), 'wpReason' ) .
 387                                         '</td>' .
 388                                         '<td class="mw-input">' .
 389                                                 Xml::input( 'wpReason', 60, $this->otherReason, array( 'id' => 'wpReason' ) ) .
 390                                         '</td>' .
 391                                 "</tr><tr>\n" .
 392                                         '<td></td>' .
 393                                         '<td class="mw-submit">' .
 394                                                 Xml::submitButton( wfMsgExt('revdelete-submit','parsemag',$numRevisions),
 395                                                         array( 'name' => 'wpSubmit' ) ) .
 396                                         '</td>' .
 397                                 "</tr>\n" .
 398                                 Xml::closeElement( 'table' ) .
 399                                 Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
 400                                 Xml::hidden( 'target', $this->targetObj->getPrefixedText() ) .
 401                                 Xml::hidden( 'type', $this->typeName ) .
 402                                 Xml::hidden( 'ids', implode( ',', $this->ids ) ) .
 403                                 Xml::closeElement( 'fieldset' ) . "\n";
 404                 } else {
 405                         $out = '';
 406                 }
 407                 if( $this->mIsAllowed ) {
 408                         $out .= Xml::closeElement( 'form' ) . "\n";
 409                         // Show link to edit the dropdown reasons
 410                         if( $wgUser->isAllowed( 'editinterface' ) ) {
 411                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'revdelete-reason-dropdown' );
 412                                 $link = $wgUser->getSkin()->link(
 413                                         $title,
 414                                         wfMsgHtml( 'revdelete-edit-reasonlist' ),
 415                                         array(),
 416                                         array( 'action' => 'edit' )
 417                                 );
 418                                 $out .= Xml::tags( 'p', array( 'class' => 'mw-revdel-editreasons' ), $link ) . "\n";
 419                         }
 420                 }
 421                 $wgOut->addHTML( $out );
 422         }
 423
 424         /**
 425          * Show some introductory text
 426          * FIXME Wikimedia-specific policy text
 427          */
 428         protected function addUsageText() {
 429                 global $wgOut, $wgUser;
 430                 $wgOut->addWikiMsg( 'revdelete-text' );
 431                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
 432                         $wgOut->addWikiMsg( 'revdelete-suppress-text' );
 433                 }
 434                 if( $this->mIsAllowed ) {
 435                         $wgOut->addWikiMsg( 'revdelete-confirm' );
 436                 }
 437         }
 438
 439         /**
 440         * @return String: HTML
 441         */
 442         protected function buildCheckBoxes() {
 443                 global $wgRequest;
 444
 445                 $html = '<table>';
 446                 // If there is just one item, use checkboxes
 447                 $list = $this->getList();
 448                 if( $list->length() == 1 ) {
 449                         $list->reset();
 450                         $bitfield = $list->current()->getBits(); // existing field
 451                         if( $this->submitClicked ) {
 452                                 $bitfield = $this->extractBitfield( $this->extractBitParams($wgRequest), $bitfield );
 453                         }
 454                         foreach( $this->checks as $item ) {
 455                                 list( $message, $name, $field ) = $item;
 456                                 $innerHTML = Xml::checkLabel( wfMsg($message), $name, $name, $bitfield & $field );
 457                                 if( $field == Revision::DELETED_RESTRICTED )
 458                                         $innerHTML = "<b>$innerHTML</b>";
 459                                 $line = Xml::tags( 'td', array( 'class' => 'mw-input' ), $innerHTML );
 460                                 $html .= "<tr>$line</tr>\n";
 461                         }
 462                 // Otherwise, use tri-state radios
 463                 } else {
 464                         $html .= '<tr>';
 465                         $html .= '<th class="mw-revdel-checkbox">'.wfMsgHtml('revdelete-radio-same').'</th>';
 466                         $html .= '<th class="mw-revdel-checkbox">'.wfMsgHtml('revdelete-radio-unset').'</th>';
 467                         $html .= '<th class="mw-revdel-checkbox">'.wfMsgHtml('revdelete-radio-set').'</th>';
 468                         $html .= "<th></th></tr>\n";
 469                         foreach( $this->checks as $item ) {
 470                                 list( $message, $name, $field ) = $item;
 471                                 // If there are several items, use third state by default...
 472                                 if( $this->submitClicked ) {
 473                                         $selected = $wgRequest->getInt( $name, 0 /* unchecked */ );
 474                                 } else {
 475                                         $selected = -1; // use existing field
 476                                 }
 477                                 $line = '<td class="mw-revdel-checkbox">' . Xml::radio( $name, -1, $selected == -1 ) . '</td>';
 478                                 $line .= '<td class="mw-revdel-checkbox">' . Xml::radio( $name, 0, $selected == 0 ) . '</td>';
 479                                 $line .= '<td class="mw-revdel-checkbox">' . Xml::radio( $name, 1, $selected == 1 ) . '</td>';
 480                                 $label = wfMsgHtml($message);
 481                                 if( $field == Revision::DELETED_RESTRICTED ) {
 482                                         $label = "<b>$label</b>";
 483                                 }
 484                                 $line .= "<td>$label</td>";
 485                                 $html .= "<tr>$line</tr>\n";
 486                         }
 487                 }
 488
 489                 $html .= '</table>';
 490                 return $html;
 491         }
 492
 493         /**
 494          * UI entry point for form submission.
 495          * @param $request WebRequest
 496          */
 497         protected function submit( $request ) {
 498                 global $wgUser, $wgOut;
 499                 # Check edit token on submission
 500                 if( $this->submitClicked && !$wgUser->matchEditToken( $request->getVal('wpEditToken') ) ) {
 501                         $wgOut->addWikiMsg( 'sessionfailure' );
 502                         return false;
 503                 }
 504                 $bitParams = $this->extractBitParams( $request );
 505                 $listReason = $request->getText( 'wpRevDeleteReasonList', 'other' ); // from dropdown
 506                 $comment = $listReason;
 507                 if( $comment != 'other' && $this->otherReason != '' ) {
 508                         // Entry from drop down menu + additional comment
 509                         $comment .= wfMsgForContent( 'colon-separator' ) . $this->otherReason;
 510                 } elseif( $comment == 'other' ) {
 511                         $comment = $this->otherReason;
 512                 }
 513                 # Can the user set this field?
 514                 if( $bitParams[Revision::DELETED_RESTRICTED]==1 && !$wgUser->isAllowed('suppressrevision') ) {
 515                         $wgOut->permissionRequired( 'suppressrevision' );
 516                         return false;
 517                 }
 518                 # If the save went through, go to success message...
 519                 $status = $this->save( $bitParams, $comment, $this->targetObj );
 520                 if ( $status->isGood() ) {
 521                         $this->success();
 522                         return true;
 523                 # ...otherwise, bounce back to form...
 524                 } else {
 525                         $this->failure( $status );
 526                 }
 527                 return false;
 528         }
 529
 530         /**
 531          * Report that the submit operation succeeded
 532          */
 533         protected function success() {
 534                 global $wgOut;
 535                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
 536                 $wgOut->wrapWikiMsg( '<span class="success">$1</span>', $this->typeInfo['success'] );
 537                 $this->list->reloadFromMaster();
 538                 $this->showForm();
 539         }
 540
 541         /**
 542          * Report that the submit operation failed
 543          */
 544         protected function failure( $status ) {
 545                 global $wgOut;
 546                 $wgOut->setPagetitle( wfMsg( 'actionfailed' ) );
 547                 $wgOut->addWikiText( $status->getWikiText( $this->typeInfo['failure'] ) );
 548                 $this->showForm();
 549         }
 550
 551         /**
 552          * Put together an array that contains -1, 0, or the *_deleted const for each bit
 553          * @param $request WebRequest
 554          * @return array
 555          */
 556         protected function extractBitParams( $request ) {
 557                 $bitfield = array();
 558                 foreach( $this->checks as $item ) {
 559                         list( /* message */ , $name, $field ) = $item;
 560                         $val = $request->getInt( $name, 0 /* unchecked */ );
 561                         if( $val < -1 || $val > 1) {
 562                                 $val = -1; // -1 for existing value
 563                         }
 564                         $bitfield[$field] = $val;
 565                 }
 566                 if( !isset($bitfield[Revision::DELETED_RESTRICTED]) ) {
 567                         $bitfield[Revision::DELETED_RESTRICTED] = 0;
 568                 }
 569                 return $bitfield;
 570         }
 571
 572         /**
 573          * Put together a rev_deleted bitfield
 574          * @param $bitPars array extractBitParams() params
 575          * @param $oldfield int current bitfield
 576          * @return array
 577          */
 578         public static function extractBitfield( $bitPars, $oldfield ) {
 579                 // Build the actual new rev_deleted bitfield
 580                 $newBits = 0;
 581                 foreach( $bitPars as $const => $val ) {
 582                         if( $val == 1 ) {
 583                                 $newBits |= $const; // $const is the *_deleted const
 584                         } else if( $val == -1 ) {
 585                                 $newBits |= ($oldfield & $const); // use existing
 586                         }
 587                 }
 588                 return $newBits;
 589         }
 590
 591         /**
 592          * Do the write operations. Simple wrapper for RevDel_*List::setVisibility().
 593          */
 594         protected function save( $bitfield, $reason, $title ) {
 595                 return $this->getList()->setVisibility(
 596                         array( 'value' => $bitfield, 'comment' => $reason )
 597                 );
 598         }
 599 }