/// <summary>
/// Registers for notification for when the specified method is received in a HttpRequest
/// </summary>
/// <param name="method">The method notification will be registered for</param>
/// <param name="onRequest">The callback to be notified when/if the method is received</param>
public void RegisterForRequestMethodNotification(string method, EventHandler <HttpRequestCancelEventArgs> onRequest)
{
// we must have a valid method
HttpUtils.ValidateToken(@"method", method);
// and we must have a valid callback
if (onRequest == null)
{
throw new ArgumentNullException("onRequest");
}
// look up the list of handlers for the specified hook point, and then look up the method in that list to
Hashtable requestHandlers = this[HttpRequestHookPoints.BeforeHttpRuntimeProcessing];
// receive the list of handlers that is handling callback notification for methods in that list
EventHandler <HttpRequestCancelEventArgs> handlers = requestHandlers[method] as EventHandler <HttpRequestCancelEventArgs>;
// if the handler list is null
if (handlers == null)
{
// add the handlers into the list by the method we're registering for
requestHandlers.Add(method, handlers);
}
// now combine the callback with all of the existing handlers
handlers = (EventHandler <HttpRequestCancelEventArgs>)Delegate.Combine(handlers, onRequest);
// and finally store that list of callbacks using the method as the key in the list from which we retrieved this initially
requestHandlers[method] = handlers;
}
/// <summary>
/// Write the value to the specified header, optionally deletes the header if the value is empty or null
/// </summary>
/// <param name="name"></param>
/// <param name="value"></param>
/// <param name="deleteIfEmptyOrNull"></param>
public virtual void WriteHeaderValue(string name, string value, bool deleteIfNullOrEmpty)
{
if (deleteIfNullOrEmpty)
{
if (HttpUtils.IsEmptryString(value) || HttpUtils.IsNullString(value))
{
_headers.Remove(name);
return;
}
}
// validate the header value, not empty, null, or contains CR or LF
HttpUtils.ValidateToken(name, value);
// otherwise if it doesn't exist
if (!_headers.Contains(name))
{
// add it in with the value specified
_headers.Add(new HttpHeader(name, value));
return;
}
// or finally just update the one that exists
_headers[name].Value = value;
}
// /// <summary>
// /// Registers for notification for when the specified method is received in a HttpRequest
// /// </summary>
// /// <param name="method">The method notification will be registered for</param>
// /// <param name="onRequest">The callback to be notified when/if the method is received</param>
// public void RegisterForRequestMethodNotification(string method, HttpRequestEventHandler onRequest)
// {
// // we must have a valid method
// HttpUtils.ValidateToken(@"method", method);
//
// // and we must have a valid callback
// if (onRequest == null)
// throw new ArgumentNullException("onRequest");
//
// // look up the list of handlers for the specified hook point, and then look up the method in that list to
// Hashtable requestHandlers = this[HttpRequestHookPoints.AfterHttpRuntimeProcessing];
//
// // receive the list of handlers that is handling callback notification for methods in that list
// HttpRequestEventHandler handlers = requestHandlers[method] as HttpRequestEventHandler;
//
// // if the handler list is null
// if (handlers == null)
// // add the handlers into the list by the method we're registering for
// requestHandlers.Add(method, handlers);
//
// // now combine the callback with all of the existing handlers
// handlers = (HttpRequestEventHandler)Delegate.Combine(handlers, onRequest);
//
// // and finally store that list of callbacks using the method as the key in the list from which we retrieved this initially
// requestHandlers[method] = handlers;
// }
/// <summary>
/// Unregisters for notification for when the specified method is received in a HttpRequest
/// </summary>
/// <param name="method">The method notification was registered for</param>
/// <param name="onRequest">The callback to be notified when/if the method is received</param>
public void UnregisterForRequestMethodNotification(string method, EventHandler <HttpRequestCancelEventArgs> onRequest)
{
// we must have a valid method
HttpUtils.ValidateToken(@"method", method);
// and we must have a valid callback
if (onRequest == null)
{
throw new ArgumentNullException("onRequest");
}
// look up the list of handlers for the specified hook point, and then look up the method in that list to
Hashtable requestHandlers = this[HttpRequestHookPoints.BeforeHttpRuntimeProcessing];
// receive the list of handlers that is handling callback notification for methods in that list
EventHandler <HttpRequestCancelEventArgs> handlers = requestHandlers[method] as EventHandler <HttpRequestCancelEventArgs>;
// if the handler list is null
if (handlers != null)
{
// add the handlers into the list by the method we're registering for
handlers = (EventHandler <HttpRequestCancelEventArgs>)Delegate.Remove(handlers, onRequest);
}
// if there are still some handlers, and the list is zero length, remove the list entirely
if (handlers != null)
{
if (handlers.GetInvocationList().Length == 0)
{
requestHandlers.Remove(method);
return;
}
}
// save the list of handlers for the next guy
requestHandlers[method] = handlers;
}
