Auth System

FoodsharingSiegen.Server/Auth/TokenAuthStateProvider.cs

@@ -0,0 +1,79 @@
+using System.Security.Claims;
+using FoodsharingSiegen.Contracts;
+using FoodsharingSiegen.Server.Auth;
+using Microsoft.AspNetCore.Components.Authorization;
+
+namespace FoodsharingSiegen.Server.Service
+{
+        /// <summary>
+        /// The token auth state provider class (a. beging, 02.04.2022)
+        /// </summary>
+        /// <seealso cref="AuthenticationStateProvider"/>
+        public class TokenAuthStateProvider : AuthenticationStateProvider
+    {
+        #region Private Fields
+
+        /// <summary> LocalStorageService </summary>
+        private readonly LocalStorageService _localStorageService;
+
+        #endregion
+
+        #region Setup/Teardown
+
+        /// <summary>
+        ///     Constructor
+        /// </summary>
+        /// <param name="localStorageService"></param>
+        public TokenAuthStateProvider(LocalStorageService localStorageService) => _localStorageService = localStorageService;
+
+        #endregion
+
+        #region Override GetAuthenticationStateAsync
+
+        ////////////////////////////////////////////////////////////////////////////////////////////////////
+        /// <summary>   Get the current authenticationstate </summary>
+        /// <remarks>   A. Beging, 02.02.2022. </remarks>
+        ////////////////////////////////////////////////////////////////////////////////////////////////////
+        public override async Task<AuthenticationState> GetAuthenticationStateAsync()
+        {
+            var token = await _localStorageService.GetItem<string>(StorageKeys.TokenKey);
+            var tokenValid = await AuthHelper.ValidateToken(token);
+
+            var identity = new ClaimsIdentity();
+            if (tokenValid)
+                identity = new ClaimsIdentity(new[]
+                {
+                    new Claim(ClaimTypes.Name, "user")
+                }, "TODO");
+            
+            var claimsPrincipal = new ClaimsPrincipal(identity);
+            return new AuthenticationState(claimsPrincipal);
+        }
+
+        #endregion
+
+        #region Public Method MarkUserAsAuthenticated
+
+        ////////////////////////////////////////////////////////////////////////////////////////////////////
+        /// <summary>   Mark user as authenticated. </summary>
+        /// <remarks>   A. Beging, 02.02.2022. </remarks>
+        ////////////////////////////////////////////////////////////////////////////////////////////////////
+        public void MarkUserAsAuthenticated() => NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
+
+        #endregion
+
+        #region Public Method MarkUserAsLoggedOut
+        
+        /// <summary>
+        /// Marks the user as logged out (a. beging, 02.04.2022)
+        /// </summary>
+        public void MarkUserAsLoggedOut()
+        {
+            var anonymousUser = new ClaimsPrincipal(new ClaimsIdentity());
+            var authState = Task.FromResult(new AuthenticationState(anonymousUser));
+            NotifyAuthenticationStateChanged(authState);
+        }
+
+        #endregion
+    }
+}