/// <summary>
/// The request gate does check the content of the request to check whether the
/// land mine is still intact or if it has been triggered by changing the content
/// into an unexpected value.
/// </summary>
/// <param name="clientId"> The client id. </param>
/// <param name="request"> The request. </param>
/// <returns> The <see cref="bool"/>. </returns>
public override bool RequestGate(string clientId, HttpRequestBase request)
{
// no client id - nothing to do...
if (string.IsNullOrEmpty(clientId))
{
return(true);
}
request.ArgumentMustNotBeNull("request");
var cache = HttpRuntime.Cache;
var key = "Landmined-" + clientId;
if (cache[key] != null)
{
return(false);
}
var currentValue =
this.RequestArea == RequestArea.Form ? request.Form[this.LandmineName] :
this.RequestArea == RequestArea.Header ? request.Headers[this.LandmineName] :
this.RequestArea == RequestArea.QueryString ? request.QueryString[this.LandmineName] :
string.Empty;
if (currentValue == this.ExpectedValue)
{
return(true);
}
cache.Add(
key,
true, // is this the smallest data we can have?
null, // no dependencies
DateTime.Now.AddSeconds(this.Seconds), // absolute expiration
Cache.NoSlidingExpiration,
CacheItemPriority.Low,
null); // no callback
return(false);
}
