/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.server.handler;
import java.nio.ByteBuffer;
import java.util.Set;
import org.opencloudb.config.ErrorCode;
import org.opencloudb.net.handler.FrontendPrivileges;
import org.opencloudb.net.mysql.OkPacket;
import org.opencloudb.server.ServerConnection;
import org.opencloudb.util.StringUtil;
/**
* @author mycat
*/
public final class UseHandler {
public static void handle(String sql, ServerConnection c, int offset) {
String schema = sql.substring(offset).trim();
int length = schema.length();
if (length > 0) {
if(schema.endsWith(";")) schema=schema.substring(0,schema.length()-1);
schema = StringUtil.replaceChars(schema, "`", null);
length=schema.length();
if (schema.charAt(0) == '\'' && schema.charAt(length - 1) == '\'') {
schema = schema.substring(1, length - 1);
}
}
// 检查schema的有效性
FrontendPrivileges privileges = c.getPrivileges();
if (schema == null || !privileges.schemaExists(schema)) {
c.writeErrMessage(ErrorCode.ER_BAD_DB_ERROR, "Unknown database '" + schema + "'");
return;
}
String user = c.getUser();
if (!privileges.userExists(user, c.getHost())) {
c.writeErrMessage(ErrorCode.ER_ACCESS_DENIED_ERROR, "Access denied for user '" + c.getUser() + "'");
return;
}
Set<String> schemas = privileges.getUserSchemas(user);
if (schemas == null || schemas.size() == 0 || schemas.contains(schema)) {
c.setSchema(schema);
ByteBuffer buffer = c.allocate();
c.write(c.writeToBuffer(OkPacket.OK, buffer));
} else {
String msg = "Access denied for user '" + c.getUser() + "' to database '" + schema + "'";
c.writeErrMessage(ErrorCode.ER_DBACCESS_DENIED_ERROR, msg);
}
}
}