internal static string Encode(AnonymousIdData data)
{
if (data == null)
{
return(null);
}
if (data.AnonymousId == null)
{
throw new ArgumentException("No anonymous id set in data; make sure you've not used an expiration data in the past", nameof(data));
}
byte[] bufferId = Encoding.UTF8.GetBytes(data.AnonymousId);
byte[] bufferIdLenght = BitConverter.GetBytes(bufferId.Length);
byte[] bufferDate = BitConverter.GetBytes(data.ExpireDate.ToFileTimeUtc());
byte[] buffer = new byte[12 + bufferId.Length];
Buffer.BlockCopy(bufferDate, 0, buffer, 0, 8);
Buffer.BlockCopy(bufferIdLenght, 0, buffer, 8, 4);
Buffer.BlockCopy(bufferId, 0, buffer, 12, bufferId.Length);
return(Base64UrlEncoder.Encode(buffer));
}
public void HandleRequest(HttpContext httpContext)
{
string encodedValue;
bool isAuthenticated = httpContext.User.Identity.IsAuthenticated;
DateTime now = DateTime.UtcNow;
// Handle secure cookies over an unsecured connection
if (cookieBuilder.SecurePolicy == CookieSecurePolicy.Always && !httpContext.Request.IsHttps)
{
encodedValue = httpContext.Request.Cookies[cookieBuilder.Name];
if (!string.IsNullOrWhiteSpace(encodedValue))
{
httpContext.Response.Cookies.Delete(cookieBuilder.Name);
}
// Adds the feature to request collection
httpContext.Features.Set <IAnonymousIdFeature>(new AnonymousIdFeature());
return;
}
// Gets the value and anonymous Id data from the cookie, if available
encodedValue = httpContext.Request.Cookies[cookieBuilder.Name];
AnonymousIdData decodedValue = AnonymousIdEncoder.Decode(encodedValue);
string anonymousId = null;
if (decodedValue != null && !string.IsNullOrWhiteSpace(decodedValue.AnonymousId))
{
// Copy the existing value in Request header
anonymousId = decodedValue.AnonymousId;
// Adds the feature to request collection
httpContext.Features.Set <IAnonymousIdFeature>(new AnonymousIdFeature()
{
AnonymousId = anonymousId
});
}
// User is already authenticated
if (isAuthenticated)
{
return;
}
// Don't create a secure cookie in an unsecured connection
if (cookieBuilder.SecurePolicy == CookieSecurePolicy.Always && !httpContext.Request.IsHttps)
{
return;
}
if (string.IsNullOrWhiteSpace(anonymousId))
{
// Creates a new identity
anonymousId = Guid.NewGuid().ToString();
// Adds the feature to request collection
httpContext.Features.Set <IAnonymousIdFeature>(new AnonymousIdFeature()
{
AnonymousId = anonymousId
});
}
else
{
// Sliding expiration is not required for this request
if (decodedValue != null &&
decodedValue.ExpireDate > now &&
decodedValue.ExpireDate - now > cookieBuilder.Expiration / 2)
{
return;
}
}
// Appends the new cookie
CookieOptions options = cookieBuilder.Build(httpContext);
AnonymousIdData data = new AnonymousIdData(anonymousId, options.Expires.Value.DateTime);
encodedValue = AnonymousIdEncoder.Encode(data);
httpContext.Response.Cookies.Append(cookieBuilder.Name, encodedValue, options);
}
