// Copyright (c) 2012, 2021, Oracle and/or its affiliates.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, version 2.0, as
// published by the Free Software Foundation.
//
// This program is also distributed with certain software (including
// but not limited to OpenSSL) that is licensed under separate terms,
// as designated in a particular file or component or in included license
// documentation.  The authors of MySQL hereby grant you an
// additional permission to link the program and your derivative works
// with the separately licensed software that they have included with
// MySQL.
//
// Without limiting anything contained in the foregoing, this file,
// which is part of MySQL Connector/NET, is also subject to the
// Universal FOSS Exception, version 1.0, a copy of which can be found at
// http://oss.oracle.com/licenses/universal-foss-exception.
//
// 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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301  USA

using System;
using System.Collections.Generic;
using System.Reflection;
using Sog.Properties;

namespace MySql.Data.MySqlClient.Authentication
{
    internal partial class AuthenticationPluginManager
    {
        private static readonly Dictionary<string, PluginInfo> Plugins = new Dictionary<string, PluginInfo>();

        static partial void AuthenticationManagerCtorConfiguration();

        static AuthenticationPluginManager()
        {
            Plugins["mysql_native_password"] = new PluginInfo("MySql.Data.MySqlClient.Authentication.MySqlNativePasswordPlugin");
            Plugins["sha256_password"] = new PluginInfo("MySql.Data.MySqlClient.Authentication.Sha256AuthenticationPlugin");
            Plugins["authentication_windows_client"] = new PluginInfo("MySql.Data.MySqlClient.Authentication.MySqlWindowsAuthenticationPlugin");
            Plugins["caching_sha2_password"] = new PluginInfo("MySql.Data.MySqlClient.Authentication.CachingSha2AuthenticationPlugin");
            Plugins["authentication_ldap_sasl_client"] = new PluginInfo("MySql.Data.MySqlClient.Authentication.MySqlSASLPlugin");
            Plugins["mysql_clear_password"] = new PluginInfo("MySql.Data.MySqlClient.Authentication.MySqlClearPasswordPlugin");
            Plugins["authentication_kerberos_client"] = new PluginInfo("MySql.Data.MySqlClient.Authentication.KerberosAuthenticationPlugin");

            AuthenticationManagerCtorConfiguration();
        }

        public static MySqlAuthenticationPlugin GetPlugin(string method)
        {
            ValidateAuthenticationPlugin(method);
            return CreatePlugin(method);
        }

        private static MySqlAuthenticationPlugin CreatePlugin(string method)
        {
            PluginInfo pi = Plugins[method];

            try
            {
                Type t = Type.GetType(pi.Type);
                MySqlAuthenticationPlugin o = (MySqlAuthenticationPlugin)Activator.CreateInstance(t);
                return o;
            }
            catch (Exception e)
            {
                throw new MySqlException(String.Format(Resources.UnableToCreateAuthPlugin, method), e);
            }
        }

        public static void ValidateAuthenticationPlugin(string method)
        {
            if (!Plugins.ContainsKey(method))
            {
                throw new MySqlException(String.Format(Resources.AuthenticationMethodNotSupported, method));
            }
        }
    }

    struct PluginInfo
    {
        public string Type;
        public Assembly Assembly;

        public PluginInfo(string type)
        {
            this.Type = type;
            this.Assembly = null;
        }
    }
}