[SignalR extensions] Fix test failure due to token expiration (Azure#39930)

* Fix test failure due to token expiration

* Don't skip the test

Author: Y-Sindo

sdk/signalr/Microsoft.Azure.WebJobs.Extensions.SignalRService/tests/DefaultSecurityTokenValidatorTests.cs

@@ -3,21 +3,23 @@
 
 using System;
 using System.Collections.Generic;
+using System.IdentityModel.Tokens.Jwt;
+using System.Text;
 using Microsoft.AspNetCore.Http;
-using Microsoft.Azure.WebJobs.Extensions.SignalRService;
 using Microsoft.Extensions.Primitives;
 using Microsoft.IdentityModel.Tokens;
 using Xunit;
 
-namespace SignalRServiceExtension.Tests
+namespace Microsoft.Azure.WebJobs.Extensions.SignalRService.Tests
 {
     public class DefaultSecurityTokenValidatorTests
     {
+        private const string IssuerToken = "myfunctionauthtest";
         public static IEnumerable<object[]> TestData = new List<object[]>
         {
             new object []
             {
-                "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJodHRwOi8vc2NoZW1hcy54bWxzb2FwLm9yZy93cy8yMDA1LzA1L2lkZW50aXR5L2NsYWltcy9uYW1lIjoiYWFhIiwiZXhwIjoxNjk5ODE5MDI1fQ.joh9CXSfRpgZhoraozdQ0Z1DxmUhlXF4ENt_1Ttz7x8",
+                "Bearer "+ GenerateJwtToken(IssuerToken, "issuer", "audience", 10),
                 SecurityTokenStatus.Valid
             },
             new object[]
@@ -32,18 +34,17 @@ public class DefaultSecurityTokenValidatorTests
             }
         };
 
-        [Theory(Skip = "the valid case is failing on main")]
+        [Theory]
         [MemberData(nameof(TestData))]
         public void ValidateSecurityTokenFacts(string tokenString, SecurityTokenStatus expectedStatus)
         {
             var ctx = new DefaultHttpContext();
             var req = ctx.Request;
             req.Headers.Add("Authorization", new StringValues(tokenString));
 
-            var issuerToken = "bXlmdW5jdGlvbmF1dGh0ZXN0"; // base64 encoded for "myfunctionauthtest";
             Action<TokenValidationParameters> configureTokenValidationParameters = parameters =>
             {
-                parameters.IssuerSigningKey = new SymmetricSecurityKey(Convert.FromBase64String(issuerToken));
+                parameters.IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(IssuerToken));
                 parameters.RequireSignedTokens = true;
                 parameters.ValidateAudience = false;
                 parameters.ValidateIssuer = false;
@@ -56,5 +57,19 @@ public void ValidateSecurityTokenFacts(string tokenString, SecurityTokenStatus e
 
             Assert.Equal(expectedStatus, securityTokenResult.Status);
         }
+
+        public static string GenerateJwtToken(string secretKey, string issuer, string audience, int expireMinutes)
+        {
+            var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(secretKey));
+            var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);
+            var token = new JwtSecurityToken(
+                issuer: issuer,
+                audience: audience,
+                expires: DateTime.Now.AddMinutes(expireMinutes),
+                signingCredentials: credentials
+            );
+
+            return new JwtSecurityTokenHandler().WriteToken(token);
+        }
     }
 }