public Task <Estatistica> Estatisticas(string alias, string referencia, string ip)
{
return(Task.Run(() =>
{
using (var urlContext = new ShortenContext())
{
ShortenUrl url = urlContext.ShortenUrl.Where(u => u.Alias == alias).FirstOrDefault();
if (url == null)
{
throw new ShortenNotFoundException();
}
url.NumeroDeClicks = url.NumeroDeClicks + 1;
Estatistica estatistica = new Estatistica()
{
Data = DateTime.Now,
Ip = ip,
Referencia = referencia,
ShortenUrl = url
};
urlContext.Estatistica.Add(estatistica);
urlContext.SaveChanges();
return estatistica;
}
}));
}
private string NovoAlias()
{
using (var urlContext = new ShortenContext())
{
int i = 0;
while (true)
{
string alias = Guid.NewGuid().ToString().Substring(0, 6);
if (!urlContext.ShortenUrl.Where(u => u.Alias == alias).Any())
{
return(alias);
}
if (i > 30)
{
break;
}
i++;
}
return(string.Empty);
}
}
public Task <ShortenUrl> ShortenUrl(string longUrl, string ip, string alias = "")
{
return(Task.Run(() =>
{
using (var urlContext = new ShortenContext())
{
ShortenUrl url;
url = urlContext.ShortenUrl.Where(u => u.LongUrl == longUrl).FirstOrDefault();
if (url != null)
{
return url;
}
if (!longUrl.StartsWith("http://") && !longUrl.StartsWith("https://"))
{
throw new ArgumentException("URL com formato inválido!");
}
Uri urlCheck = new Uri(longUrl);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlCheck);
request.Timeout = 10000;
try
{
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
}
catch (Exception)
{
throw new ShortenNotFoundException();
}
int cap = 0;
string capString = ConfigurationManager.AppSettings["MaxNumberShortUrlsPerHour"];
int.TryParse(capString, out cap);
DateTime dataCriacao = DateTime.Now.Subtract(new TimeSpan(1, 0, 0));
int count = urlContext.ShortenUrl.Where(u => u.Ip == ip && u.Adicionado >= dataCriacao).Count();
if (cap != 0 && count > cap)
{
throw new ArgumentException("Você excedeu o limite diário.");
}
if (!string.IsNullOrEmpty(alias))
{
if (urlContext.ShortenUrl.Where(u => u.Alias == alias).Any())
{
throw new ShortenConflitoException();
}
if (alias.Length > 20 || !Regex.IsMatch(alias, @"^[A-Za-z\d_-]+$"))
{
throw new ArgumentException("Alias com formato errado ou muito longo.");
}
}
else
{
alias = this.NovoAlias();
}
if (string.IsNullOrEmpty(alias))
{
throw new ArgumentException("Alias vazio.");
}
url = new ShortenUrl()
{
Adicionado = DateTime.Now,
Ip = ip,
LongUrl = longUrl,
NumeroDeClicks = 0,
Alias = alias
};
urlContext.ShortenUrl.Add(url);
urlContext.SaveChanges();
return url;
}
}));
}
