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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Net;
using IPFiltering.Configuration;
namespace IPFiltering
{
/// <summary>
/// Http module that filters requests based on their ip address
/// </summary>
public class IPFilterModule : IHttpModule
{
private static ThreadSafeSingleton<IPFilter> _filter = new ThreadSafeSingleton<IPFilter>(Create);
/// <summary>
/// Gets the filter.
/// </summary>
/// <value>The filter.</value>
protected static IPFilter Filter
{
get
{
return _filter.Value;
}
}
/// <summary>
/// Disposes of the resources (other than memory) used by the module that implements <see cref="T:System.Web.IHttpModule"/>.
/// </summary>
public void Dispose()
{
}
/// <summary>
/// Initializes a module and prepares it to handle requests.
/// </summary>
/// <param name="context">An <see cref="T:System.Web.HttpApplication"/> that provides access to the methods, properties, and events common to all application objects within an ASP.NET application</param>
public void Init(HttpApplication context)
{
context.BeginRequest += new EventHandler(context_BeginRequest);
}
/// <summary>
/// Handles the BeginRequest event of the context control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
private void context_BeginRequest(object sender, EventArgs e)
{
HttpContext context = (sender as HttpApplication).Context;
IPAddress address = IPAddress.Parse(context.Request.UserHostAddress);
IPFilterType result = Filter.CheckAddress(address);
if (result == IPFilterType.Deny)
{
context.Response.StatusCode = 401;
context.Response.Output.Write("<html><body>Access Denied<body></html>");
context.Response.End();
}
}
private static IPFilter Create()
{
return FilterFactory.Create(IPFilterConfiguration.Default.Filters[IPFilterConfiguration.Default.HttpModuleConfig.FilterName]);
}
}
}
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