[C#] Token-Storage and Generate

Tokens can be used to authenticate transactions or authorize people and even more...

Initialize your Token-Storage:

Code:

static Dictionary<string, DateTime> token_storage = new Dictionary<string, DateTime>();

Generate a Token:

Code:

byte[] actual_time = BitConverter.GetBytes(DateTime.UtcNow.ToBinary());
byte[] unique_token = Guid.NewGuid().ToByteArray();
string full_token = Convert.ToBase64String(actual_time.Concat(unique_token).ToArray());

Add the Token to the Storage:

Code:

token_storage.Add(full_token,DateTime.Now);

If you have a lot of tokens in your storage you want to delete the expired ones... Check every 5 minutes if there are some expired tokens...

The timer:

Code:

timer = new Timer(1000*300);
timer.Elapsed += checkTokens;
static void timer_checkTokens(object sender, ElapsedEventArgs e)
{
    var expiredTokens = token_storage.Where(p => p.Value.AddDays(1) <= DateTime.Now).Select(p => p.Key);

    foreach (var key in expiredTokens) {
        token_storage.Remove(key);
    }
}