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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\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; } private static function buildSetBitDeletedField( $field, $op, $value, IDatabase $dbw ) { 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 ); } }
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