QuotifyBE/Controllers/GeneralUseHelperFunctions.cs

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

namespace QuotifyBE.Controllers;

public class GeneralUseHelpers
{
    public string GenerateJwtToken(string username, IConfiguration appsettings)
    {
        var claims = new[]
        {
            new Claim(JwtRegisteredClaimNames.Sub, username),
            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
        };

        var key = new SymmetricSecurityKey(
            Encoding.UTF8.GetBytes(appsettings["JwtSecret"]!)
            // won't be null here - otherwise Program.cs wouldn't start
        );
        var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

        var token = new JwtSecurityToken(
            issuer: appsettings["DomainName"]!,
            audience: appsettings["DomainName"]!,
            claims: claims,
            expires: DateTime.Now.AddDays(7),
            signingCredentials: creds
        );

        return new JwtSecurityTokenHandler().WriteToken(token);
    }
}