From 90c5f5a5eb0dcd4da54c8a452351fbd6201dba82 Mon Sep 17 00:00:00 2001
From: johnthagen <johnthagen@gmail.com>
Date: Fri, 23 Oct 2020 14:06:35 -0400
Subject: [PATCH] Update PermissionService.cs

---
 Backend/Services/PermissionService.cs | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Backend/Services/PermissionService.cs b/Backend/Services/PermissionService.cs
index 16d3cc029d..e6c221f581 100644
--- a/Backend/Services/PermissionService.cs
+++ b/Backend/Services/PermissionService.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.IdentityModel.Tokens.Jwt;
 using BackendFramework.Interfaces;
 using BackendFramework.Models;
@@ -102,8 +103,28 @@ public string GetUserId(HttpContext request)
         {
             var jsonToken = GetJwt(request);
             var userId = ((JwtSecurityToken)jsonToken).Payload["UserId"].ToString();
+            if (userId == null)
+            {
+                throw new InvalidJwtTokenError();
+            }
+
             return userId;
         }
+
+        [Serializable]
+        public class InvalidJwtTokenError : Exception
+        {
+            public InvalidJwtTokenError()
+            { }
+
+            public InvalidJwtTokenError(string message)
+                : base(message)
+            { }
+
+            public InvalidJwtTokenError(string message, Exception innerException)
+                : base(message, innerException)
+            { }
+        }
     }
 }