Setting Up Social Authentication in ASP.NET Core 2.0 - asp.net-core

Question

I'm setting up social login in an ASP.NET Core 2.0 application without using Identity.
I simply want to authenticate the user through Facebook, Google and LinkedIn and receive their info. I handle storing user info myself.
Here's what I've done so far which is giving me the following error:
No authentication handler is configured to handle the scheme: facebook
Here's the Startup.cs file changes:
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
// Added these lines for cookie and Facebook authentication
services.AddAuthentication("MyCookieAuthenticationScheme")
.AddCookie(options => {
options.AccessDeniedPath = "/Account/Forbidden/";
options.LoginPath = "/Account/Login/";
})
.AddFacebook(facebookOptions =>
{
facebookOptions.AppId = "1234567890";
facebookOptions.AppSecret = "1234567890";
});
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseBrowserLink();
}
else
{
app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();
// Added this line
app.UseAuthentication();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
I then have this action method where I send the user to determine the provider we're using for authenticaiton e.g. Facebook, Google, etc. This code came from my ASP.NET Core 1.1 app which is working fine.
[AllowAnonymous]
public async Task ExternalLogin(string provider, string returnUrl)
{
var properties = new AuthenticationProperties
{
RedirectUri = "Login/Callback"
};
// Add returnUrl to properties -- if applicable
if (!string.IsNullOrEmpty(returnUrl) && Url.IsLocalUrl(returnUrl))
properties.Items.Add("returnUrl", returnUrl);
// The ASP.NET Core 1.1 version of this line was
// await HttpContext.Authentication.ChallengeAsync(provider, properties);
await HttpContext.ChallengeAsync(provider, properties);
return;
}
I'm getting the error message when I hit the ChallangeAsync line.
What am I doing wrong?

Answer 1

No authentication handler is configured to handle the scheme: facebook
Scheme names are case-sensitive. Use provider=Facebook instead of provider=facebook and it should work.