private async Task attachUserToContext(HttpContext context, IUserRepository userService, string token)
{
try
{
var tokenHandler = new JwtSecurityTokenHandler();
var secretKey = MySettings.GetSecretKey();
var key = Encoding.ASCII.GetBytes(secretKey);
tokenHandler.ValidateToken(token, new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(key),
ValidateIssuer = false,
ValidateAudience = false,
// set clockskew to zero so tokens expire exactly at token expiration time (instead of 5 minutes later)
ClockSkew = TimeSpan.Zero
}, out SecurityToken validatedToken);
var jwtToken = (JwtSecurityToken)validatedToken;
var userId = Guid.Parse(jwtToken.Claims.First(x => x.Type == "id").Value);
// attach user to context on successful jwt validation
Result result = await userService.GetUserById(userId);
var data = result.Data != null ? (List <User>)result.Data : null;
User user = data.Count > 0 ? data[0] : null;
context.Items["User"] = user;
}
catch
{
// do nothing if jwt validation fails
// user is not attached to context so request won't have access to secure routes
}
}
private string generateJwtToken(Guid userId)
{
// generate token that is valid for 7 days
var secretKey = MySettings.GetSecretKey();
var tokenHandler = new JwtSecurityTokenHandler();
var key = Encoding.ASCII.GetBytes(secretKey);
var tokenDescriptor = new SecurityTokenDescriptor
{
Subject = new ClaimsIdentity(new[] { new Claim("id", userId.ToString()) }),
Expires = DateTime.UtcNow.AddDays(7),
SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
};
var token = tokenHandler.CreateToken(tokenDescriptor);
return(tokenHandler.WriteToken(token));
}
