add basic auth for greenfield

BTCPayServer/Security/Basic/BasicAuthenticationHandler.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Claims;
+using System.Text;
+using System.Text.Encodings.Web;
+using System.Threading.Tasks;
+using BTCPayServer.Client;
+using BTCPayServer.Data;
+using BTCPayServer.Security.APIKeys;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace BTCPayServer.Security.Basic
+{
+    public class BasicAuthenticationHandler : AuthenticationHandler<BasicAuthenticationOptions>
+    {
+        private readonly IOptionsMonitor<IdentityOptions> _identityOptions;
+        private readonly SignInManager<ApplicationUser> _signInManager;
+        private readonly UserManager<ApplicationUser> _userManager;
+
+        public BasicAuthenticationHandler(
+            
+            IOptionsMonitor<IdentityOptions> identityOptions,
+            SignInManager<ApplicationUser> signInManager,
+            UserManager<ApplicationUser> userManager,
+            IOptionsMonitor<BasicAuthenticationOptions> options,
+            ILoggerFactory logger,
+            UrlEncoder encoder,
+            ISystemClock clock) : base(options, logger, encoder, clock)
+        {
+            _identityOptions = identityOptions;
+            _signInManager = signInManager;
+            _userManager = userManager;
+        }
+
+        protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
+        {
+        
+            string authHeader = Context.Request.Headers["Authorization"];
+
+            if (authHeader == null || !authHeader.StartsWith("Basic ")) return AuthenticateResult.NoResult();
+            var encodedUsernamePassword = authHeader.Split(' ', 2, StringSplitOptions.RemoveEmptyEntries)[1]?.Trim();
+            var decodedUsernamePassword = Encoding.UTF8.GetString(Convert.FromBase64String(encodedUsernamePassword)).Split(':');
+            var username = decodedUsernamePassword[0];
+            var password = decodedUsernamePassword[1];
+
+            var result = await _signInManager.PasswordSignInAsync(username, password, true, true);
+            if (!result.Succeeded) return AuthenticateResult.Fail(result.ToString());
+                
+            var user = await _userManager.FindByNameAsync(username);
+            var claims = new List<Claim>()
+            {
+                new Claim(_identityOptions.CurrentValue.ClaimsIdentity.UserIdClaimType, user.Id),
+                new Claim(APIKeyConstants.ClaimTypes.Permission, Permission.Create(Policies.Unrestricted).ToString())
+            };
+            
+            return AuthenticateResult.Success(new AuthenticationTicket(
+                new ClaimsPrincipal(new ClaimsIdentity(claims, APIKeyConstants.AuthenticationType)), APIKeyConstants.AuthenticationType));
+
+        }
+    }
+}