Implement "Close on auth expiration" for serverless mode

src/Microsoft.Azure.SignalR.Management/Negotiation/NegotiateProcessor.cs

@@ -50,7 +50,9 @@ public async Task<NegotiationResponse> NegotiateAsync(string hubName, Negotiatio
                 {
                     claimProvider = () => claims;
                 }
-                var claimsWithUserId = ClaimsUtility.BuildJwtClaims(httpContext?.User, userId: userId, claimProvider, enableDetailedErrors: enableDetailedErrors, isDiagnosticClient: isDiagnosticClient);
+                var closeOnAuthenticationExpiration = negotiationOptions.CloseOnAuthenticationExpiration;
+                var authenticationExpiresOn = closeOnAuthenticationExpiration ? DateTimeOffset.UtcNow.Add(negotiationOptions.TokenLifetime) : default(DateTimeOffset?);
+                var claimsWithUserId = ClaimsUtility.BuildJwtClaims(httpContext?.User, userId: userId, claimProvider, enableDetailedErrors: enableDetailedErrors, isDiagnosticClient: isDiagnosticClient, closeOnAuthenticationExpiration: closeOnAuthenticationExpiration, authenticationExpiresOn: authenticationExpiresOn);
 
                 var tokenTask = provider.GenerateClientAccessTokenAsync(hubName, claimsWithUserId, lifetime);
                 await tokenTask.OrTimeout(cancellationToken, Timeout, GeneratingTokenTaskDescription);

src/Microsoft.Azure.SignalR.Management/Negotiation/NegotiationOptions.cs

@@ -7,40 +7,44 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Connections;
 
-namespace Microsoft.Azure.SignalR.Management
+namespace Microsoft.Azure.SignalR.Management;
+
+public class NegotiationOptions
 {
-    public class NegotiationOptions
-    {
-        internal static readonly NegotiationOptions Default = new NegotiationOptions();
-
-        /// <summary>
-        /// Gets or sets the HTTP context object that might provide information for routing and generating access token.
-        /// </summary>
-        public HttpContext HttpContext { get; set; }
-
-        /// <summary>
-        /// Gets or sets the user ID. If null, the identity name in <see cref="HttpContext.User" /> of the property <see cref="HttpContext"/> will be used.
-        /// </summary>
-        public string UserId { get; set; }
-
-        /// <summary>
-        /// Gets or sets the claim list to be put into access token. If null, the claims in <see cref="HttpContext.User"/> of the property <see cref="HttpContext"/> will be used.
-        /// </summary>
-        public IList<Claim> Claims { get; set; }
-
-        /// <summary>
-        /// Gets or sets the lifetime of <see cref="NegotiationResponse.AccessToken"/>. Default value is one hour.
-        /// </summary>
-        public TimeSpan TokenLifetime { get; set; } = TimeSpan.FromHours(1);
-
-        /// <summary>
-        /// Gets or sets the flag indicates whether the client is a diagnostic client.
-        /// </summary>
-        public bool IsDiagnosticClient { get; set; } = false;
-
-        /// <summary>
-        /// Gets or sets the flag indicates whether detailed errors are logged in the client side.
-        /// </summary>
-        public bool EnableDetailedErrors { get; set; } = false;
-    }
+    internal static readonly NegotiationOptions Default = new NegotiationOptions();
+
+    /// <summary>
+    /// Gets or sets the HTTP context object that might provide information for routing and generating access token.
+    /// </summary>
+    public HttpContext HttpContext { get; set; }
+
+    /// <summary>
+    /// Gets or sets the user ID. If null, the identity name in <see cref="HttpContext.User" /> of the property <see cref="HttpContext"/> will be used.
+    /// </summary>
+    public string UserId { get; set; }
+
+    /// <summary>
+    /// Gets or sets the claim list to be put into access token. If null, the claims in <see cref="HttpContext.User"/> of the property <see cref="HttpContext"/> will be used.
+    /// </summary>
+    public IList<Claim> Claims { get; set; }
+
+    /// <summary>
+    /// Gets or sets the lifetime of <see cref="NegotiationResponse.AccessToken"/>. Default value is one hour.
+    /// </summary>
+    public TimeSpan TokenLifetime { get; set; } = TimeSpan.FromHours(1);
+
+    /// <summary>
+    /// Gets or sets the flag indicates whether the client is a diagnostic client.
+    /// </summary>
+    public bool IsDiagnosticClient { get; set; } = false;
+
+    /// <summary>
+    /// Gets or sets the flag indicates whether detailed errors are logged in the client side.
+    /// </summary>
+    public bool EnableDetailedErrors { get; set; } = false;
+
+    /// <summary>
+    /// Gets or sets the flag indicates that whether the connection should be closed when the authentication token expires. The lifetime of the token is determined by <see cref="TokenLifetime"/>.
+    /// </summary>
+    public bool CloseOnAuthenticationExpiration { get; set; } = false;
 }

test/Microsoft.Azure.SignalR.Management.Tests/NegotiateProcessorFacts.cs

@@ -31,6 +31,23 @@ from claims in _claimLists
                                                                            from appName in _appNames
                                                                            select new object[] { userId, claims, appName };
 
+        [Fact]
+        public async Task GenerateTokenWithCloseOnAuthExpiration()
+        {
+            var hubContext = await new ServiceManagerBuilder()
+                .WithOptions(o => o.ConnectionString = "Endpoint=https://zityang-signalr-standard-dev.service.signalr.net;AccessKey=K/JHYahkm7MAZHc9G0R5rvCM5gCI/Fh9oIgVF9xdWFA=;Version=1.0;")
+                .BuildServiceManager()
+                .CreateHubContextAsync("hub", default);
+            var now = DateTimeOffset.UtcNow;
+            var negotiateResponse = await hubContext.NegotiateAsync(new NegotiationOptions { CloseOnAuthenticationExpiration = true, TokenLifetime = TimeSpan.FromSeconds(30) });
+            var token = JwtTokenHelper.JwtHandler.ReadJwtToken(negotiateResponse.AccessToken);
+            var closeOnAuthExpiration = Assert.Single(token.Claims.Where(c => c.Type == Constants.ClaimType.CloseOnAuthExpiration));
+            Assert.Equal("true", closeOnAuthExpiration.Value);
+            var ttl = Assert.Single(token.Claims.Where(c => c.Type == Constants.ClaimType.AuthExpiresOn));
+            Assert.True(long.TryParse(ttl.Value, out var expiresOn));
+            Assert.InRange(DateTimeOffset.FromUnixTimeSeconds(expiresOn), now.AddSeconds(29), now.AddSeconds(32));
+        }
+
         [Theory]
         [MemberData(nameof(TestGenerateAccessTokenData))]
         public async Task GenerateClientEndpoint(string userId, Claim[] claims, string appName)