/// <summary>
 /// Constructs AmazonRDSClient with AWS Credentials and an
 /// AmazonRDSClient Configuration object.
 /// </summary>
 /// <param name="credentials">AWS Credentials</param>
 /// <param name="clientConfig">The AmazonRDSClient Configuration Object</param>
 public AmazonRDSClient(AWSCredentials credentials, AmazonRDSConfig clientConfig)
     : base(credentials, clientConfig, false, AuthenticationTypes.User | AuthenticationTypes.Session)
 {
 }

 /// <summary>
 /// Create a client for the Amazon RDS Service with AWSCredentials and an AmazonRDS Configuration object.
 /// </summary>
 /// <param name="credentials">AWS Credentials</param>
 /// <param name="config">Configuration options for the service like HTTP Proxy, # of connections, etc</param>
 /// <returns>An Amazon RDS client</returns>
 /// <remarks>
 /// </remarks>
 public static AmazonRDS CreateAmazonRDSClient(AWSCredentials credentials, AmazonRDSConfig config)
 {
     return new AmazonRDSClient(credentials, config);
 }

 /// <summary>
 /// Constructs AmazonRDSClient with AWS Access Key ID, AWS Secret Key and an
 /// AmazonRDSClient Configuration object. 
 /// </summary>
 /// <param name="awsAccessKeyId">AWS Access Key ID</param>
 /// <param name="awsSecretAccessKey">AWS Secret Access Key</param>
 /// <param name="awsSessionToken">AWS Session Token</param>
 /// <param name="clientConfig">The AmazonRDSClient Configuration Object</param>
 public AmazonRDSClient(string awsAccessKeyId, string awsSecretAccessKey, string awsSessionToken, AmazonRDSConfig clientConfig)
     : base(awsAccessKeyId, awsSecretAccessKey, awsSessionToken, clientConfig)
 {
 }

 /// <summary>
 /// Constructs AmazonRDSClient with the credentials defined in the App.config.
 /// 
 /// Example App.config with credentials set. 
 /// <code>
 /// &lt;?xml version="1.0" encoding="utf-8" ?&gt;
 /// &lt;configuration&gt;
 ///     &lt;appSettings&gt;
 ///         &lt;add key="AWSAccessKey" value="********************"/&gt;
 ///         &lt;add key="AWSSecretKey" value="****************************************"/&gt;
 ///     &lt;/appSettings&gt;
 /// &lt;/configuration&gt;
 /// </code>
 ///
 /// </summary>
 /// <param name="config">The AmazonRDS Configuration Object</param>
 public AmazonRDSClient(AmazonRDSConfig config)
     : base(new EnvironmentAWSCredentials(), config, true, AuthenticationTypes.User)
 {
 }

        private OperationResult EstablishClient(AddonManifest manifest, DeveloperOptions devOptions, out AmazonRDSClient client)
        {
            OperationResult result;

            bool requireCreds;
            var manifestProps = manifest.GetProperties().ToDictionary(x => x.Key, x => x.Value);
            var accessKey = manifestProps["AWSClientKey"];
            var secretAccessKey = manifestProps["AWSSecretKey"];
            var regionEndpoint = manifestProps["AWSRegionEndpoint"];

            var prop =
                manifest.Properties.First(
                    p => p.Key.Equals("requireDevCredentials", StringComparison.InvariantCultureIgnoreCase));

            if (bool.TryParse(prop.Value, out requireCreds) && requireCreds)
            {
                if (!ValidateDevCreds(devOptions))
                {
                    client = null;
                    result = new OperationResult()
                    {
                        IsSuccess = false,
                        EndUserMessage =
                            "The add on requires that developer credentials are specified but none were provided."
                    };
                    return result;
                }

                accessKey = devOptions.AccessKey;
                secretAccessKey = devOptions.SecretAccessKey;
            }
            AmazonRDSConfig config = new AmazonRDSConfig() { RegionEndpoint = RegionEndpoint.USEast1 };
            client = new AmazonRDSClient(accessKey, secretAccessKey, config);
            result = new OperationResult { IsSuccess = true };
            return result;
        }