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<?php
/**
* Backend functions for suppressing and unsuppressing all references to a given user.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup RevisionDelete
*/
use MediaWiki\Logging\LogPage;
use MediaWiki\MediaWikiServices;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Title\Title;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\RawSQLValue;
/**
* Backend functions for suppressing and unsuppressing all references to a given user,
* used when blocking with HideUser enabled. This was spun out of SpecialBlockip.php
* in 1.18; at some point it needs to be rewritten to either use RevisionDelete abstraction,
* or at least schema abstraction.
*
* @ingroup RevisionDelete
*/
class RevisionDeleteUser {
/**
* Update *_deleted bitfields in various tables to hide or unhide usernames
*
* @param string $name Username
* @param int $userId
* @param string $op Operator '|' or '&'
* @param null|IDatabase $dbw If you happen to have one lying around
* @return bool True on success, false on failure (e.g. invalid user ID)
*/
private static function setUsernameBitfields( $name, $userId, $op, ?IDatabase $dbw = null ) {
if ( !$userId || ( $op !== '|' && $op !== '&' ) ) {
return false;
}
if ( !$dbw instanceof IDatabase ) {
$dbw = MediaWikiServices::getInstance()->getConnectionProvider()->getPrimaryDatabase();
}
# To suppress, we OR the current bitfields with RevisionRecord::DELETED_USER
# to put a 1 in the username *_deleted bit. To unsuppress we AND the
# current bitfields with the inverse of RevisionRecord::DELETED_USER. The
# username bit is made to 0 (x & 0 = 0), while others are unchanged (x & 1 = x).
# The same goes for the sysop-restricted *_deleted bit.
$delUser = RevisionRecord::DELETED_USER | RevisionRecord::DELETED_RESTRICTED;
$delAction = LogPage::DELETED_ACTION | RevisionRecord::DELETED_RESTRICTED;
if ( $op === '&' ) {
$delUser = $dbw->bitNot( $delUser );
$delAction = $dbw->bitNot( $delAction );
}
# Normalize user name
$userTitle = Title::makeTitleSafe( NS_USER, $name );
$userDbKey = $userTitle->getDBkey();
$actorId = $dbw->newSelectQueryBuilder()
->select( 'actor_id' )
->from( 'actor' )
->where( [ 'actor_name' => $name ] )
->caller( __METHOD__ )->fetchField();
if ( $actorId ) {
# Hide name from live edits
$dbw->newUpdateQueryBuilder()
->update( 'revision' )
->set( self::buildSetBitDeletedField( 'rev_deleted', $op, $delUser, $dbw ) )
->where( [ 'rev_actor' => $actorId ] )
->caller( __METHOD__ )->execute();
# Hide name from deleted edits
$dbw->newUpdateQueryBuilder()
->update( 'archive' )
->set( self::buildSetBitDeletedField( 'ar_deleted', $op, $delUser, $dbw ) )
->where( [ 'ar_actor' => $actorId ] )
->caller( __METHOD__ )->execute();
# Hide name from logs
$dbw->newUpdateQueryBuilder()
->update( 'logging' )
->set( self::buildSetBitDeletedField( 'log_deleted', $op, $delUser, $dbw ) )
->where( [ 'log_actor' => $actorId, $dbw->expr( 'log_type', '!=', 'suppress' ) ] )
->caller( __METHOD__ )->execute();
# Hide name from RC
$dbw->newUpdateQueryBuilder()
->update( 'recentchanges' )
->set( self::buildSetBitDeletedField( 'rc_deleted', $op, $delUser, $dbw ) )
->where( [ 'rc_actor' => $actorId ] )
->caller( __METHOD__ )->execute();
# Hide name from live images
$dbw->newUpdateQueryBuilder()
->update( 'oldimage' )
->set( self::buildSetBitDeletedField( 'oi_deleted', $op, $delUser, $dbw ) )
->where( [ 'oi_actor' => $actorId ] )
->caller( __METHOD__ )->execute();
# Hide name from deleted images
$dbw->newUpdateQueryBuilder()
->update( 'filearchive' )
->set( self::buildSetBitDeletedField( 'fa_deleted', $op, $delUser, $dbw ) )
->where( [ 'fa_actor' => $actorId ] )
->caller( __METHOD__ )->execute();
}
# Hide log entries pointing to the user page
$dbw->newUpdateQueryBuilder()
->update( 'logging' )
->set( self::buildSetBitDeletedField( 'log_deleted', $op, $delAction, $dbw ) )
->where( [
'log_namespace' => NS_USER,
'log_title' => $userDbKey,
$dbw->expr( 'log_type', '!=', 'suppress' )
] )
->caller( __METHOD__ )->execute();
# Hide RC entries pointing to the user page
$dbw->newUpdateQueryBuilder()
->update( 'recentchanges' )
->set( self::buildSetBitDeletedField( 'rc_deleted', $op, $delAction, $dbw ) )
->where( [ 'rc_namespace' => NS_USER, 'rc_title' => $userDbKey, $dbw->expr( 'rc_logid', '>', 0 ) ] )
->caller( __METHOD__ )->execute();
return true;
}
/**
* @param string $field
* @param string $op
* @param string|int $value
* @param IDatabase $dbw
*/
private static function buildSetBitDeletedField(
string $field, string $op, $value, IDatabase $dbw
): array {
return [ $field => new RawSQLValue( $op === '&'
? $dbw->bitAnd( $field, $value )
: $dbw->bitOr( $field, $value )
) ];
}
/**
* @param string $name User name
* @param int $userId Both user name and ID must be provided
* @param IDatabase|null $dbw If you happen to have one lying around
* @return bool True on success, false on failure (e.g. invalid user ID)
*/
public static function suppressUserName( $name, $userId, ?IDatabase $dbw = null ) {
return self::setUsernameBitfields( $name, $userId, '|', $dbw );
}
/**
* @param string $name User name
* @param int $userId Both user name and ID must be provided
* @param IDatabase|null $dbw If you happen to have one lying around
* @return bool True on success, false on failure (e.g. invalid user ID)
*/
public static function unsuppressUserName( $name, $userId, ?IDatabase $dbw = null ) {
return self::setUsernameBitfields( $name, $userId, '&', $dbw );
}
}