includes/revisiondelete/RevisionDeleteUser.php

   1 <?php
   2 /**
   3  * Backend functions for suppressing and unsuppressing all references to a given user.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup RevisionDelete
  22  */
  23
  24 use Wikimedia\Rdbms\IDatabase;
  25
  26 /**
  27  * Backend functions for suppressing and unsuppressing all references to a given user,
  28  * used when blocking with HideUser enabled.  This was spun out of SpecialBlockip.php
  29  * in 1.18; at some point it needs to be rewritten to either use RevisionDelete abstraction,
  30  * or at least schema abstraction.
  31  *
  32  * @ingroup RevisionDelete
  33  */
  34 class RevisionDeleteUser {
  35
  36         /**
  37          * Update *_deleted bitfields in various tables to hide or unhide usernames
  38          * @param string $name Username
  39          * @param int $userId User id
  40          * @param string $op Operator '|' or '&'
  41          * @param null|IDatabase $dbw If you happen to have one lying around
  42          * @return bool
  43          */
  44         private static function setUsernameBitfields( $name, $userId, $op, $dbw ) {
  45                 if ( !$userId || ( $op !== '|' && $op !== '&' ) ) {
  46                         return false; // sanity check
  47                 }
  48                 if ( !$dbw instanceof IDatabase ) {
  49                         $dbw = wfGetDB( DB_MASTER );
  50                 }
  51
  52                 # To suppress, we OR the current bitfields with Revision::DELETED_USER
  53                 # to put a 1 in the username *_deleted bit. To unsuppress we AND the
  54                 # current bitfields with the inverse of Revision::DELETED_USER. The
  55                 # username bit is made to 0 (x & 0 = 0), while others are unchanged (x & 1 = x).
  56                 # The same goes for the sysop-restricted *_deleted bit.
  57                 $delUser = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
  58                 $delAction = LogPage::DELETED_ACTION | Revision::DELETED_RESTRICTED;
  59                 if ( $op == '&' ) {
  60                         $delUser = $dbw->bitNot( $delUser );
  61                         $delAction = $dbw->bitNot( $delAction );
  62                 }
  63
  64                 # Normalize user name
  65                 $userTitle = Title::makeTitleSafe( NS_USER, $name );
  66                 $userDbKey = $userTitle->getDBkey();
  67
  68                 # Hide name from live edits
  69                 $dbw->update(
  70                         'revision',
  71                         [ self::buildSetBitDeletedField( 'rev_deleted', $op, $delUser, $dbw ) ],
  72                         [ 'rev_user' => $userId ],
  73                         __METHOD__ );
  74
  75                 # Hide name from deleted edits
  76                 $dbw->update(
  77                         'archive',
  78                         [ self::buildSetBitDeletedField( 'ar_deleted', $op, $delUser, $dbw ) ],
  79                         [ 'ar_user_text' => $name ],
  80                         __METHOD__
  81                 );
  82
  83                 # Hide name from logs
  84                 $dbw->update(
  85                         'logging',
  86                         [ self::buildSetBitDeletedField( 'log_deleted', $op, $delUser, $dbw ) ],
  87                         [ 'log_user' => $userId, 'log_type != ' . $dbw->addQuotes( 'suppress' ) ],
  88                         __METHOD__
  89                 );
  90                 $dbw->update(
  91                         'logging',
  92                         [ self::buildSetBitDeletedField( 'log_deleted', $op, $delAction, $dbw ) ],
  93                         [ 'log_namespace' => NS_USER, 'log_title' => $userDbKey,
  94                                 'log_type != ' . $dbw->addQuotes( 'suppress' ) ],
  95                         __METHOD__
  96                 );
  97
  98                 # Hide name from RC
  99                 $dbw->update(
 100                         'recentchanges',
 101                         [ self::buildSetBitDeletedField( 'rc_deleted', $op, $delUser, $dbw ) ],
 102                         [ 'rc_user_text' => $name ],
 103                         __METHOD__
 104                 );
 105                 $dbw->update(
 106                         'recentchanges',
 107                         [ self::buildSetBitDeletedField( 'rc_deleted', $op, $delAction, $dbw ) ],
 108                         [ 'rc_namespace' => NS_USER, 'rc_title' => $userDbKey, 'rc_logid > 0' ],
 109                         __METHOD__
 110                 );
 111
 112                 # Hide name from live images
 113                 $dbw->update(
 114                         'oldimage',
 115                         [ self::buildSetBitDeletedField( 'oi_deleted', $op, $delUser, $dbw ) ],
 116                         [ 'oi_user_text' => $name ],
 117                         __METHOD__
 118                 );
 119
 120                 # Hide name from deleted images
 121                 $dbw->update(
 122                         'filearchive',
 123                         [ self::buildSetBitDeletedField( 'fa_deleted', $op, $delUser, $dbw ) ],
 124                         [ 'fa_user_text' => $name ],
 125                         __METHOD__
 126                 );
 127                 # Done!
 128                 return true;
 129         }
 130
 131         private static function buildSetBitDeletedField( $field, $op, $value, $dbw ) {
 132                 return $field . ' = ' . ( $op === '&'
 133                         ? $dbw->bitAnd( $field, $value )
 134                         : $dbw->bitOr( $field, $value ) );
 135         }
 136
 137         public static function suppressUserName( $name, $userId, $dbw = null ) {
 138                 return self::setUsernameBitfields( $name, $userId, '|', $dbw );
 139         }
 140
 141         public static function unsuppressUserName( $name, $userId, $dbw = null ) {
 142                 return self::setUsernameBitfields( $name, $userId, '&', $dbw );
 143         }
 144 }