// https://tools.ietf.org/html/rfc7231#page-46
// bahhh. so user agents are not terribly strict and they seem to be interpreted in many ways
public static Browser Parse(string ua)
{
if (string.IsNullOrEmpty(ua))
{
throw new ArgumentNullException("ua");
}
ua = ua.ToLower();
MatchCollection mc = Regex.Matches(ua, @"(?<name>\w+)(/|:){1}(?<major>\d+)(\.(?<minor>\d+)?)");
Browser b = new Browser();
foreach (Match m in mc)
{
string minor = m.Groups["minor"].Value;
if (string.IsNullOrEmpty(minor))
{
minor = "0";
}
BrowserIdentity bi = new BrowserIdentity()
{
Name = m.Groups["name"].Value,
MajorVersion = Convert.ToInt32(m.Groups["major"].Value),
MinorVersion = Convert.ToInt32(minor)
};
b.AddIdentity(bi);
}
// always return something. "garbage" in this case!
if (b.Identities == null || b.Identities.Count == 0)
{
// will test for crawler format
// example : Googlebot/2.1 (+http://www.google.com/bot.html)
// example : Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
// example : Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)
bool isCrawler = Regex.IsMatch(ua, @"\w+(/|:){1}(\d+)(\.(\d+)?)\s+\(([^\+]*)\+http[s]{0,1}://[^\)]+\)");
// not going to get into crawler identity at this point
b.AddIdentity(new BrowserIdentity()
{
Name = (isCrawler ? "crawler" : "garbage"),
MajorVersion = 1,
MinorVersion = 0
});
}
return(b);
}
public void AddIdentity(BrowserIdentity identity)
{
if (this.Identities == null)
{
this.Identities = new Dictionary <string, BrowserIdentity> ();
}
if (this.Identities.ContainsKey(identity.Name.ToLower()))
{
this.Identities[identity.Name.ToLower()] = identity;
}
else
{
this.Identities.Add(identity.Name.ToLower(), identity);
}
}
