Snippet for Anne Staff

public class JwtGenerator : IGenerator
    {
        private const string TOKEN_KEY = "TokenKey";
        private const int DAYS_NUMBER = 7;

        private readonly SymmetricSecurityKey key;

        public Generator(IConfiguration config)
        {
            this.key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(config[TOKEN_KEY]));
        }

        public string CreateToken(AppUser user)
        {
            var claims = new List<Claim>
            {
                new Claim(RegisteredClaimNames.NameId, user.UserName)
            };

            var credentials = new SigningCredentials(this.key, SecurityAlgorithms.HmacSha512Signature);

            var tokenDescriptor = new SecurityTokenDescriptor
            {
                Subject = new ClaimsIdentity(claims),
                Expires = DateTime.Now.AddDays(DAYS_NUMBER),
                SigningCredentials = credentials
            };

            var tokenHandler = new SecurityTokenHandler();

            var token = tokenHandler.CreateToken(tokenDescriptor);

            return tokenHandler.WriteToken(token);
        }