eShopOnContainers/src/Web/WebMVC/Extensions/HttpClientExtensions.cs

using System;
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

namespace Microsoft.eShopOnContainers.WebMVC.Extensions
{
    public static class HttpClientExtensions
    {
        public static void SetBasicAuthentication(this HttpClient client, string userName, string password) =>
            client.DefaultRequestHeaders.Authorization = new BasicAuthenticationHeaderValue(userName, password);

        public static void SetToken(this HttpClient client, string scheme, string token) =>
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(scheme, token);

        public static void SetBearerToken(this HttpClient client, string token) =>
            client.SetToken(JwtConstants.TokenType, token);
    }

    public class BasicAuthenticationHeaderValue : AuthenticationHeaderValue
    {
        public BasicAuthenticationHeaderValue(string userName, string password)
            : base("Basic", EncodeCredential(userName, password))
        { }

        private static string EncodeCredential(string userName, string password)
        {
            Encoding encoding = Encoding.GetEncoding("iso-8859-1");
            string credential = String.Format("{0}:{1}", userName, password);

            return Convert.ToBase64String(encoding.GetBytes(credential));
        }
    }
}