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using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Claims;
using System.Text;
using System.Threading.Tasks;
using Timeline.Configs;
using Timeline.Entities;
namespace Timeline.Services
{
public interface IJwtService
{
/// <summary>
/// Create a JWT token for a given user.
/// Return null if <paramref name="user"/> is null.
/// </summary>
/// <param name="user">The user to generate token.</param>
/// <returns>The generated token or null if <paramref name="user"/> is null.</returns>
string GenerateJwtToken(User user);
}
public class JwtService : IJwtService
{
private readonly IOptionsMonitor<JwtConfig> _jwtConfig;
private readonly JwtSecurityTokenHandler _tokenHandler = new JwtSecurityTokenHandler();
public JwtService(IOptionsMonitor<JwtConfig> jwtConfig)
{
_jwtConfig = jwtConfig;
}
public string GenerateJwtToken(User user)
{
if (user == null)
return null;
var jwtConfig = _jwtConfig.CurrentValue;
var identity = new ClaimsIdentity();
identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()));
identity.AddClaims(user.Roles.Select(role => new Claim(identity.RoleClaimType, role)));
var tokenDescriptor = new SecurityTokenDescriptor()
{
Subject = identity,
Issuer = jwtConfig.Issuer,
Audience = jwtConfig.Audience,
SigningCredentials = new SigningCredentials(
new SymmetricSecurityKey(Encoding.ASCII.GetBytes(jwtConfig.SigningKey)), SecurityAlgorithms.HmacSha384),
IssuedAt = DateTime.Now,
Expires = DateTime.Now.AddDays(1)
};
var token = _tokenHandler.CreateToken(tokenDescriptor);
var tokenString = _tokenHandler.WriteToken(token);
return tokenString;
}
}
}
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