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WCF Service Behavior Example: IPFilter - Allow/Deny Access by IP Address

, 15 Jun 2009 CPOL
WCF Service Behavior Example: IPFilter - Allow/Deny Access by IP Address
IPFilterExample.zip
IPFilterTests
bin
Debug
IPFilter.dll
IPFilterTests.dll
Configuration
Mock
Properties
TestWebsite
App_Data
bin
IPFilter.dll
IPFilter.pdb
TestWebsite.dll
TestWebsite.pdb
Filtered
Properties
TestWebsite.csproj.user
IPFilterExample.suo
IPFilterExample.vsmdi
IPFilterExample1.vsmdi
IPFilterExample2.vsmdi
LocalTestRun.testrunconfig
IPFilter
bin
Debug
IPFilter.dll
Configuration
Properties
IPFilterExamples.zip
IPFilterExample3.vsmdi
LocalTestRun.testrunconfig
IPFilter.dll
IPFilter.csproj.user
IPFilter.dll
IPFilterTests.dll
IPFilter.dll
IPFilter.pdb
TestWebsite.dll
TestWebsite.pdb
TestWebsite.csproj.user
IPFilterExample.vsmdi
IPFilterExample1.vsmdi
IPFilterExample2.vsmdi
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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About the Author

Ziad Elmalki

United States United States
No Biography provided

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Web03 | 2.8.141223.1 | Last Updated 16 Jun 2009
Article Copyright 2009 by Ziad Elmalki
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