//uid 암호화
public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values)
{
//Get uid from route data
string uid = values["uid"] == null ? string.Empty : values["uid"].ToString();
if(!string.IsNullOrWhiteSpace(uid))
{
//Encrypt and url encode uid
AesCryptography helper = new AesCryptography();
byte[] encryptedId = helper.EncryptStringToBytes(uid);
values["uid"] = HttpServerUtility.UrlTokenEncode(encryptedId);
}
return base.GetVirtualPath(requestContext, values);
}
public ActionResult GotoPartnerSite(string uid)
{
AesCryptography cipher = new AesCryptography();
string dateTime = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ");
byte[] hmac = cipher.Hmac(dateTime, uid);
UriBuilder target = new UriBuilder("http", "localhost", 65103, "/Home/PartnerSite");
target.Query = string.Format("i={0}&t={1}&h={2}",
HttpServerUtility.UrlTokenEncode(cipher.EncryptStringToBytes(uid)),
HttpServerUtility.UrlTokenEncode(cipher.EncryptStringToBytes(dateTime)),
HttpServerUtility.UrlTokenEncode(hmac)
);
return Redirect(target.Uri.AbsoluteUri);
}
public string PartnerSite(string i, string t, string h)
{
AesCryptography cipher = new AesCryptography();
try
{
string uid = cipher.DecryptStringFromBytes(HttpServerUtility.UrlTokenDecode(Request.QueryString["i"]));
string dateTime = cipher.DecryptStringFromBytes(HttpServerUtility.UrlTokenDecode(Request.QueryString["t"]));
byte[] hmac = HttpServerUtility.UrlTokenDecode(Request.QueryString["h"]);
DateTime dateTimeToCompare = Convert.ToDateTime(dateTime);
//2분제약
double allowedTime = 2;
if (DateTime.Now.AddMinutes(allowedTime * -1) > dateTimeToCompare || DateTime.Now.AddMinutes(allowedTime) < dateTimeToCompare)
{
return "Access is not allowed due to the URL expiration";
}
//HMC 점검
byte[] hmacHere = cipher.Hmac(dateTime, uid);
if (!hmac.SequenceEqual(hmacHere))
{
return "Access is not permitted due to the tampered URL [" + Encoding.UTF8.GetString(hmac) + "]/[" + Encoding.UTF8.GetString(hmacHere) + "]";
}
else
{
return "Welcome UID [" + uid + "]";
}
}
catch (Exception ex)
{
return "Error: " + ex.Message;
}
}
//uid 복호화
public override RouteData GetRouteData(HttpContextBase httpContext)
{
//Get the base class to build the route data
var routeData = base.GetRouteData(httpContext);
//url not matched
if (routeData == null) return null;
//all ids are supposed to be encrypted. Decrypt it!
if(routeData.Values["uid"] != System.Web.Mvc.UrlParameter.Optional)
{
string encryptedUid = (string)routeData.Values["uid"];
byte[] byteId = HttpServerUtility.UrlTokenDecode(encryptedUid);
if (byteId == null) return null;
AesCryptography helper = new AesCryptography();
string uid = helper.DecryptStringFromBytes(byteId);
//Modify uid value for controller to see it as normal
routeData.Values["uid"] = uid;
}
return routeData;
}
