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LearningControllerSelector.cs
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LearningControllerSelector.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Web;
using System.Web.Http;
using System.Web.Http.Controllers;
using System.Web.Http.Dispatcher;
namespace Learning.Web.Services
{
public class LearningControllerSelector : DefaultHttpControllerSelector
{
private HttpConfiguration _config;
public LearningControllerSelector(HttpConfiguration config)
: base(config)
{
_config = config;
}
public override HttpControllerDescriptor SelectController(HttpRequestMessage request)
{
var controllers = GetControllerMapping(); //Will ignore any controls in same name even if they are in different namepsace
var routeData = request.GetRouteData();
var controllerName = routeData.Values["controller"].ToString();
HttpControllerDescriptor controllerDescriptor;
if (controllers.TryGetValue(controllerName, out controllerDescriptor))
{
//var version = GetVersionFromQueryString(request);
//var version = GetVersionFromHeader(request);
var version = GetVersionFromAcceptHeaderVersion(request);
var versionedControllerName = string.Concat(controllerName, "V", version);
HttpControllerDescriptor versionedControllerDescriptor;
if (controllers.TryGetValue(versionedControllerName, out versionedControllerDescriptor))
{
return versionedControllerDescriptor;
}
return controllerDescriptor;
}
return null;
}
private string GetVersionFromAcceptHeaderVersion(HttpRequestMessage request)
{
var acceptHeader = request.Headers.Accept;
foreach (var mime in acceptHeader)
{
if (mime.MediaType == "application/json")
{
var version = mime.Parameters
.Where(v => v.Name.Equals("version", StringComparison.OrdinalIgnoreCase))
.FirstOrDefault();
if (version != null)
{
return version.Value;
}
return "1";
}
}
return "1";
}
private string GetVersionFromHeader(HttpRequestMessage request)
{
const string HEADER_NAME = "X-Learning-Version";
if (request.Headers.Contains(HEADER_NAME))
{
var versionHeader = request.Headers.GetValues(HEADER_NAME).FirstOrDefault();
if (versionHeader != null)
{
return versionHeader;
}
}
return "1";
}
private string GetVersionFromQueryString(HttpRequestMessage request)
{
var query = HttpUtility.ParseQueryString(request.RequestUri.Query);
var version = query["v"];
if (version != null)
{
return version;
}
return "1";
}
}
}