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using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Authentication;
using System.Text;
using System.Threading.Tasks;
namespace Tango.Web.Authentication
{
public class TokensManager<T> where T : IEquatable<T>
{
private Dictionary<String, TokenWrapper> _tokens;
private class TokenWrapper : IEquatable<TokenWrapper>
{
public DateTime Date { get; set; }
public T Value { get; set; }
public bool Equals(TokenWrapper other)
{
return Value.Equals(other.Value);
}
}
public TokensManager()
{
_tokens = new Dictionary<string, TokenWrapper>();
ExpirationTime = TimeSpan.FromHours(1);
}
public TimeSpan ExpirationTime { get; set; }
public String GetOrCreate(T tokenObject)
{
var existing_token = _tokens.FirstOrDefault(x => x.Value.Value.Equals(tokenObject));
if (existing_token.Key != null)
{
return existing_token.Key;
}
else
{
String token = Guid.NewGuid().ToString();
_tokens.Add(token, new TokenWrapper()
{
Value = tokenObject,
Date = DateTime.Now,
});
return token;
}
}
public bool Exists(String token)
{
RemoveOrRenewExpired(token);
return _tokens.ContainsKey(token);
}
public T GetTokenObject(String token)
{
RemoveOrRenewExpired(token);
if (!_tokens.ContainsKey(token))
{
throw new AuthenticationException("Invalid token.");
}
return _tokens[token].Value;
}
private void RemoveOrRenewExpired(String token)
{
DateTime now = DateTime.Now;
if (_tokens.ContainsKey(token))
{
_tokens[token].Date = now;
}
foreach (var t in _tokens.ToList())
{
if (now > t.Value.Date.Add(ExpirationTime))
{
_tokens.Remove(t.Key);
}
}
}
}
}
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