SwiftClient.Cli.AuthManager.ValidateLogin C# (CSharp) Method

        private bool ValidateLogin()
        {
            bool exists = true;

            var endpoint = Environment.GetEnvironmentVariable("SWIFT_URL");
            var username = Environment.GetEnvironmentVariable("SWIFT_USER");
            var password = Environment.GetEnvironmentVariable("SWIFT_KEY");

            if (string.IsNullOrEmpty(endpoint))
            {
                Console.WriteLine("SWIFT_URL environment variable not set");
                exists = false;
            }
            else
            {
                credentials.Endpoints = new List<string> { endpoint };
            }

            if (string.IsNullOrEmpty(username))
            {
                Console.WriteLine("SWIFT_USER environment variable not set");
                exists = false;
            }
            else
            {
                credentials.Username = username;
            }

            if (string.IsNullOrEmpty(password))
            {
                Console.WriteLine("SWIFT_KEY environment variable not set");
                exists = false;
            }
            else
            {
                credentials.Password = password;
            }

            return exists;
        }