public IActionResult Login(StudentLoginRequest request)
        {
            var student = service.GetLoggingStudent(request);

            if (student == null)
            {
                return(Unauthorized("Student o podanym indeksie i haśle nie istnieje w bazie danych!"));
            }
            var claims = new Claim[]
            {
                new Claim(ClaimTypes.NameIdentifier, student.IndexNumber),
                new Claim(ClaimTypes.Name, student.FirstName),
                new Claim(ClaimTypes.Role, "student")
            };

            var key   = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["SecretKey"]));
            var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

            var token = new JwtSecurityToken
                        (
                issuer: "Gakko",
                audience: "Students",
                claims: claims,
                expires: DateTime.Now.AddMinutes(10),
                signingCredentials: creds
                        );

            return(Ok(new
            {
                token = new JwtSecurityTokenHandler().WriteToken(token),
                refreshToken = Guid.NewGuid()
            }));
        }