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SecureBank.Helpers/AuthenticationHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Claims;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace SecureBank.Helpers
+{
+    public class AuthenticationHelper
+    {
+        #region METHODS
+
+        public static IEnumerable<Claim> ParseToken(string token)
+        {
+            string payload = token.Split('.')[1];
+
+            switch (payload.Length % 4)
+            {
+                case 2: payload += "=="; break;
+                case 3: payload += "="; break;
+            }
+
+            byte[] jsonBytes = Convert.FromBase64String(payload);
+            Dictionary<string, object>? keyValuePairs = JsonSerializer.Deserialize<Dictionary<string, object>>(jsonBytes);
+
+            if (keyValuePairs is null)
+            {
+                throw new Exception("Incorrect token");
+            }
+
+            return keyValuePairs.Select(kvp => new Claim(kvp.Key, kvp.Value.ToString()));
+        }
+
+        #endregion
+    }
+}