ScpBackend/WebApiService/src/Win_in.Sfs.Scp.WebApi.Xml.Host/LocalAutherication/BasicAuthenticationHandler.cs

using System;
using System.Net.Http.Headers;
using System.Security.Claims;
using System.Text;
using System.Text.Encodings.Web;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace Win_in.Sfs.Scp.WebApi.XmlHost
{
    public class BasicAuthenticationHandler : AuthenticationHandler<AuthenticationSchemeOptions>
    {
        private readonly BasicAuthenticationOptions _basicOptions;

        public BasicAuthenticationHandler(
            IOptions<BasicAuthenticationOptions> basicOptions,
            IOptionsMonitor<AuthenticationSchemeOptions> options,
            ILoggerFactory logger,
            UrlEncoder encoder,
            ISystemClock clock)
            : base(options, logger, encoder, clock)
        {
            _basicOptions = basicOptions.Value;
        }

        protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
        {
            if (!Request.Headers.ContainsKey("Authorization"))
            {
                Response.Headers.Add("WWW-Authenticate", @"Basic realm='Secure Area'");
                return AuthenticateResult.Fail("Missing Authorization Header");
            }
            BasicUser basicUser = null;
            try
            {
                var authHeader = AuthenticationHeaderValue.Parse(Request.Headers["Authorization"]);
                var credentialBytes = Convert.FromBase64String(authHeader.Parameter);
                var credentials = Encoding.UTF8.GetString(credentialBytes).Split(new[] { ':' }, 2);
                var username = credentials[0];
                var password = credentials[1];
                if (username.Equals(_basicOptions.Username) && password.Equals(_basicOptions.Password))
                {
                    basicUser = new BasicUser { Id = 1, Username = "admin"};
                }
            }
            catch
            {
                // Base64×Ö·û´®½âÂëʧ°Ü
                return AuthenticateResult.Fail("Invalid Authorization Header");
            }

            if (basicUser == null)
                return AuthenticateResult.Fail("Invalid Username or Password");

            var claims = new[] {
                new Claim(ClaimTypes.NameIdentifier, basicUser.Id.ToString()),
                new Claim(ClaimTypes.Name, basicUser.Username),
            };
            var identity = new ClaimsIdentity(claims, Scheme.Name);
            var principal = new ClaimsPrincipal(identity);
            var ticket = new AuthenticationTicket(principal, Scheme.Name);

            return AuthenticateResult.Success(ticket);
        }
    }
}