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Reading Payload from JWT token string

Red Team answered on July 19, 2023 Popularity 7/10 Helpfulness 1/10

answer Reading Payload from JWT token string

Reading Payload from JWT token string

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using System;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Claims;
using Microsoft.IdentityModel.Tokens;

public class JwtTokenParser
{
    private readonly string _secretKey;

    public JwtTokenParser(string secretKey)
    {
        _secretKey = secretKey;
    }

    public bool TryParseToken(string token, out Payload payload)
    {
        payload = null;

        var tokenHandler = new JwtSecurityTokenHandler();
        var validationParameters = new TokenValidationParameters
        {
            ValidateIssuerSigningKey = true,
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_secretKey)),
            ValidateIssuer = false,
            ValidateAudience = false
        };

        try
        {
            ClaimsPrincipal claimsPrincipal = tokenHandler.ValidateToken(token, validationParameters, out SecurityToken validatedToken);

            payload = new Payload
            {
                UserId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value,
                Roles = claimsPrincipal.FindAll(ClaimTypes.Role)?.Select(claim => claim.Value).ToList()
            };

            return true;
        }
        catch (Exception)
        {
            return false;
        }
    }
}

public class Payload
{
    public string UserId { get; set; }
    public List<string> Roles { get; set; }
}

Popularity 7/10 Helpfulness 1/10 Language csharp

Source: chat.openai.com

Tags: c# jwt payload string token

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Contributed on Jul 19 2023

Red Team

0 Answers Avg Quality 2/10

Reading Payload from JWT token string

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