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using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
namespace System.Web.Http
{
/// <summary>
/// Extends the HttpRequestMessage collection
/// </summary>
public static class HttpRequestMessageExtensions
{
private const string HttpContext = "MS_HttpContext";
private const string RemoteEndpointMessage = "System.ServiceModel.Channels.RemoteEndpointMessageProperty";
/// <summary>
/// Returns a dictionary of QueryStrings that's easier to work with
/// than GetQueryNameValuePairs KevValuePairs collection.
///
/// If you need to pull a few single values use GetQueryString instead.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public static Dictionary<string, string> GetQueryStrings(this HttpRequestMessage request)
{
return request.GetQueryNameValuePairs()
.ToDictionary(kv => kv.Key, kv => kv.Value, StringComparer.OrdinalIgnoreCase);
}
/// <summary>
/// Returns an individual querystring value
/// </summary>
/// <param name="request"></param>
/// <param name="key"></param>
/// <returns></returns>
public static string GetQueryString(this HttpRequestMessage request, string key)
{
// IEnumerable<KeyValuePair<string,string>> - right!
var queryStrings = request.GetQueryNameValuePairs();
if (queryStrings == null)
return null;
var match = queryStrings.FirstOrDefault(kv => string.Compare(kv.Key, key, true) == 0);
if (string.IsNullOrEmpty(match.Value))
return null;
return match.Value;
}
/// <summary>
/// Returns an individual HTTP Header value
/// </summary>
/// <param name="request"></param>
/// <param name="key"></param>
/// <returns></returns>
public static string GetHeader(this HttpRequestMessage request, string key)
{
IEnumerable<string> keys = null;
if (!request.Headers.TryGetValues(key, out keys))
return null;
return keys.First();
}
/// <summary>
/// Retrieves an individual cookie from the cookies collection
/// </summary>
/// <param name="request"></param>
/// <param name="cookieName"></param>
/// <returns></returns>
public static string GetCookie(this HttpRequestMessage request, string cookieName)
{
CookieHeaderValue cookie = request.Headers.GetCookies(cookieName).FirstOrDefault();
if (cookie != null)
return cookie[cookieName].Value;
return null;
}
public static string GetClientIpAddress(this HttpRequestMessage request)
{
if (request.Properties.ContainsKey(HttpContext))
{
dynamic ctx = request.Properties[HttpContext];
if (ctx != null)
{
return ctx.Request.UserHostAddress;
}
}
if (request.Properties.ContainsKey(RemoteEndpointMessage))
{
dynamic remoteEndpoint = request.Properties[RemoteEndpointMessage];
if (remoteEndpoint != null)
{
return remoteEndpoint.Address;
}
}
return null;
}
}
} |