.net core web api basic auth (学习笔记6)

1、自定义中间件

using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
 
namespace WebApplication29
{
    public class AuthenticationMiddleware
    {
        private readonly RequestDelegate _next;
 
        
 
        public AuthenticationMiddleware(RequestDelegate next)
        {
            _next = next;
        }
 
        public async Task Invoke(HttpContext context)
        {
            string authHeader = context.Request.Headers["Authorization"];
            if (authHeader != null && authHeader.StartsWith("Basic"))
            {
                //Extract credentials
                string encodedUsernamePassword = authHeader.Substring("Basic ".Length).Trim();
                Encoding encoding = Encoding.GetEncoding("iso-8859-1");
                string usernamePassword = encoding.GetString(Convert.FromBase64String(encodedUsernamePassword));
                int seperatorIndex = usernamePassword.IndexOf(':');
                var username = usernamePassword.Substring(0, seperatorIndex);
                var password = usernamePassword.Substring(seperatorIndex + 1);
 
                if (IsAuthorized(username,password))
                {
                    await _next.Invoke(context);
                }
                else
                {
                    context.Response.StatusCode = 401; //Unauthorized
                    return;
                }
            }
            else
            {
                // no authorization header
                context.Response.StatusCode = 401; //Unauthorized
                return;
            }
        }
 
 
        public bool IsAuthorized(string username, string password)
        {
            IConfiguration Configuration = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", true)
                .Build();
 
            var basicAuthUserName = Configuration["BasicAuth:UserName"];
            var basicAuthPassword = Configuration["BasicAuth:Password"];
            // Check that username and password are correct
            return username.Equals(basicAuthUserName, StringComparison.InvariantCultureIgnoreCase)
                   && password.Equals(basicAuthPassword);
        }
 
    }
}