Notes

using DAL.Entities;
using Microsoft.IdentityModel.Tokens;
using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Claims;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Common_Utilities.Security_Utils
{
public class SecurityUtil
{

public static string ComputeSha256Hash(string rawData)
{
// Create a SHA256
using (SHA256 sha256Hash = SHA256.Create())
{
// ComputeHash - returns byte array
byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));

// Convert byte array to a string
StringBuilder builder = new();

foreach (var t in bytes)
{
builder.Append(t.ToString("x2"));
}

return builder.ToString();
}
}

public static string GenerateJwtToken(User user)
{
var tokenHandler = new JwtSecurityTokenHandler();

byte[] key = Encoding.ASCII.GetBytes("mjnhgvftdoqowevla");

#pragma warning disable CS8602 // Dereference of a possibly null reference.
#pragma warning disable CS8602 // Dereference of a possibly null reference.
#pragma warning disable CS8602 // Dereference of a possibly null reference.
var tokenDescriptor = new SecurityTokenDescriptor
{
Subject = new ClaimsIdentity(
new[]
{
new Claim(ClaimTypes.NameIdentifier, user.UserName.ToString()),
new Claim(ClaimTypes.GivenName, user.FirstName.ToString()),
new Claim(ClaimTypes.Surname, user.LastName.ToString()),
new Claim(ClaimTypes.Email, user.Email ?? string.Empty),
//new Claim(ClaimTypes.Role, user.Role),
new Claim("Sid", user.Id.ToString()),
}),

Expires = DateTime.Now.AddDays(1), //Token expires after 1 days
SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature),
Issuer = "https://iframe-turbokredit-api.cityfinance.az/",
Audience = "MyAPI",
};
#pragma warning restore CS8602 // Dereference of a possibly null reference.
#pragma warning restore CS8602 // Dereference of a possibly null reference.
#pragma warning restore CS8602 // Dereference of a possibly null reference.
#pragma warning disable CS8602 // Dereference of a possibly null reference.
foreach (var item in user?.Roles)
{
tokenDescriptor.Subject.AddClaim(new Claim(ClaimTypes.Role, item.Name));
}
#pragma warning restore CS8602 // Dereference of a possibly null reference.
SecurityToken token = tokenHandler.CreateToken(tokenDescriptor);

return tokenHandler.WriteToken(token);
}
}
}