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+<?php
+/**
+ * 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.
+ *
+ * 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
+ */
+class RevisionDeleteUser {
+
+ /**
+ * Update *_deleted bitfields in various tables to hide or unhide usernames
+ * @param $name String username
+ * @param $userId Int user id
+ * @param $op String operator '|' or '&'
+ * @param $dbw null|Database, if you happen to have one lying around
+ * @return bool
+ */
+ private static function setUsernameBitfields( $name, $userId, $op, $dbw ) {
+ if( $op !== '|' && $op !== '&' ){
+ return false; // sanity check
+ }
+ if( !$dbw instanceof DatabaseBase ){
+ $dbw = wfGetDB( DB_MASTER );
+ }
+
+ # To suppress, we OR the current bitfields with Revision::DELETED_USER
+ # to put a 1 in the username *_deleted bit. To unsuppress we AND the
+ # current bitfields with the inverse of Revision::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 = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
+ $delAction = LogPage::DELETED_ACTION | Revision::DELETED_RESTRICTED;
+ if( $op == '&' ) {
+ $delUser = "~{$delUser}";
+ $delAction = "~{$delAction}";
+ }
+
+ # Normalize user name
+ $userTitle = Title::makeTitleSafe( NS_USER, $name );
+ $userDbKey = $userTitle->getDBkey();
+
+ # Hide name from live edits
+ $dbw->update(
+ 'revision',
+ array( "rev_deleted = rev_deleted $op $delUser" ),
+ array( 'rev_user' => $userId ),
+ __METHOD__ );
+
+ # Hide name from deleted edits
+ $dbw->update(
+ 'archive',
+ array( "ar_deleted = ar_deleted $op $delUser" ),
+ array( 'ar_user_text' => $name ),
+ __METHOD__
+ );
+
+ # Hide name from logs
+ $dbw->update(
+ 'logging',
+ array( "log_deleted = log_deleted $op $delUser" ),
+ array( 'log_user' => $userId, "log_type != 'suppress'" ),
+ __METHOD__
+ );
+ $dbw->update(
+ 'logging',
+ array( "log_deleted = log_deleted $op $delAction" ),
+ array( 'log_namespace' => NS_USER, 'log_title' => $userDbKey,
+ "log_type != 'suppress'" ),
+ __METHOD__
+ );
+
+ # Hide name from RC
+ $dbw->update(
+ 'recentchanges',
+ array( "rc_deleted = rc_deleted $op $delUser" ),
+ array( 'rc_user_text' => $name ),
+ __METHOD__
+ );
+ $dbw->update(
+ 'recentchanges',
+ array( "rc_deleted = rc_deleted $op $delAction" ),
+ array( 'rc_namespace' => NS_USER, 'rc_title' => $userDbKey, 'rc_logid > 0' ),
+ __METHOD__
+ );
+
+ # Hide name from live images
+ $dbw->update(
+ 'oldimage',
+ array( "oi_deleted = oi_deleted $op $delUser" ),
+ array( 'oi_user_text' => $name ),
+ __METHOD__
+ );
+
+ # Hide name from deleted images
+ $dbw->update(
+ 'filearchive',
+ array( "fa_deleted = fa_deleted $op $delUser" ),
+ array( 'fa_user_text' => $name ),
+ __METHOD__
+ );
+ # Done!
+ return true;
+ }
+
+ public static function suppressUserName( $name, $userId, $dbw = null ) {
+ return self::setUsernameBitfields( $name, $userId, '|', $dbw );
+ }
+
+ public static function unsuppressUserName( $name, $userId, $dbw = null ) {
+ return self::setUsernameBitfields( $name, $userId, '&', $dbw );
+ }
+} \ No newline at end of file