iot/projects/Infrastructure/Jwt/JwtHelper.cs

using JWT.Algorithms;
using JWT.Builder;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;

namespace Infrastructure.Jwt
{
    public class JwtHelper : IJwtHelper
    {
        private readonly IConfiguration _cfg;

        public JwtHelper(IConfiguration cfg)
        {
            this._cfg = cfg;
        }

        public IDictionary<string, object> GetPayload(string token)
        {
            var secret = this._cfg["jwt:key"];
            var payload = new JwtBuilder()
                    .WithSecret(secret)
                    .MustVerifySignature()
                    .Decode<IDictionary<string, object>>(token);
            return payload;
        }

        public string GetToken(IDictionary<string, object> payload)
        {
            var secret = this._cfg["jwt:key"];
            var builder = new JwtBuilder()
                .WithAlgorithm(new HMACSHA256Algorithm())
                .WithSecret(secret)
                .AddClaim("exp", DateTimeOffset.UtcNow.AddYears(100).ToUnixTimeSeconds());
            foreach (var item in payload)
            {
                builder.AddClaim(item.Key, item.Value);
            }
            var token = builder.Build();
            return token;
        }
    }
}