添加项目文件。

TechHelper.Client/Features/JWTParser.cs

@@ -0,0 +1,57 @@
+using System.Security.Claims;
+using System.Text.Json;
+
+namespace TechHelper.Features
+{
+	public static class JWTParser
+	{
+		public static IEnumerable<Claim> ParseClaimsFromJwt(string jwt)
+		{
+			var claims = new List<Claim>();
+			var payload = jwt.Split(".")[1];
+
+			var jsonBytes = ParseBase64WithoutPadding(payload);
+
+			var keyValuePairs = JsonSerializer
+				.Deserialize<Dictionary<string, object>>(jsonBytes);
+
+			ExtractRolesFromJWT(claims, keyValuePairs);
+
+			claims.AddRange(keyValuePairs
+				.Select(kvp => new Claim(kvp.Key, kvp.Value.ToString())));
+
+			return claims;
+		}
+
+		private static byte[] ParseBase64WithoutPadding(string base64)
+		{
+			switch (base64.Length % 4)
+			{
+				case 2: base64 += "=="; break;
+				case 3: base64 += "="; break;
+			}
+			return Convert.FromBase64String(base64);
+		}
+
+		private static void ExtractRolesFromJWT(List<Claim> claims, Dictionary<string, object> keyValuePairs)
+		{
+			keyValuePairs.TryGetValue(ClaimTypes.Role, out object roles);
+			if (roles != null)
+			{
+				var parsedRoles = roles.ToString().Trim().TrimStart('[').TrimEnd(']').Split(',');
+				if (parsedRoles.Length > 1)
+				{
+					foreach (var parsedRole in parsedRoles)
+					{
+						claims.Add(new Claim(ClaimTypes.Role, parsedRole.Trim('"')));
+					}
+				}
+				else
+				{
+					claims.Add(new Claim(ClaimTypes.Role, parsedRoles[0]));
+				}
+				keyValuePairs.Remove(ClaimTypes.Role);
+			}
+		}
+	}
+}