Web API login with facebook external provider - asp.net

Question

I am having a hard time authenticating doing external authentication with Facebook on Web API. This is my controller to handle the Facebook button click.
[Route("facebooklogin", Name= "FacebookLogin")]
[ValidateAntiForgeryToken()]
public async Task<ActionResult> FacebookLogin()
{
string facebookLink = string.Empty;
//Get available logins from api
using(HttpClient client = new HttpClient() { BaseAddress = new Uri(Request.Url.GetLeftPart(UriPartial.Authority)) })
{
var returnUrl = Url.RouteUrl("FacebookCallback");
var url = "/api/Account/ExternalLogins?returnUrl=" + HttpUtility.UrlEncode(returnUrl + "&generateState=true");
var response = await client.GetAsync(url);
response.EnsureSuccessStatusCode();
if (response.IsSuccessStatusCode)
{
var loginList = await response.Content.ReadAsAsync<List<ExternalLoginViewModel>>();
facebookLink = loginList.Where(x => x.Name == "Facebook").Select(x => x.Url).FirstOrDefault();
//Send a get request to the facebook url
var facebookUrlResponse = await client.GetAsync(facebookLink);
facebookUrlResponse.EnsureSuccessStatusCode();
}
else { }
}
return View();
}
[Route("facebookcallback", Name="FacebookCallback")]
public ActionResult FacebookLoginCallback()
{
//Parse the access_token from facebook from the url
return View();
}
Whenenever i debug to var facebookUrlResponse = await client.GetAsync(facebookLink);, i realise i have a bad request. My code gets all the available external login providers and then try to use the url available generated for Facebook to hit the /api/Account/ExternalLogin endpoint in the account controller. I am unable hit that endpoint.
I get this error message:
Response status code does not indicate success: 400 (Bad Request).
I plan to have the redirect uri come to the FacebookCallback route. Then i can parse the access_token from the uri and do further procession. Can anyone please help me out?
I could glean this info from postman:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Net.Http.HttpRequestException: Response status code does not indicate success: 400 (Bad Request).
The source error is:
//Send a get request to the facebook url
Line 135: var facebookUrlResponse = await client.GetAsync(facebookLink);
This is the stacktrace also:
[HttpRequestException: Response status code does not indicate success: 400 (Bad Request).]
System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode() +92180
Blinkas.Web.Controllers.<FacebookLogin>d__6.MoveNext() in C:\Users\Williams\Documents\Visual Studio 2015\Projects\Blinkas\Blinkas.Web\Controllers\HomeController.cs:136
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
System.Runtime.CompilerServices.TaskAwaiter.GetResult() +26
System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted(Task task) +42
System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +73
System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeAsynchronousActionMethod>b__36(IAsyncResult asyncResult) +37
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +68
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +34
System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +69
System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +230
System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +68
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +42
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +124
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +29
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +27
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +21
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +32
System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +26
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +40
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +21
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +24
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +27
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +21
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +29
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +23
System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +129