public IActionResult ExternalLogin(string provider, string returnUrl = null)
{
// Request a redirect to the external login provider.
var redirectUrl = Url.Action(nameof(ExternalLoginCallback), "Account", new { returnUrl });
var properties = _signInManager.ConfigureExternalAuthenticationProperties(provider, redirectUrl);
return(Challenge(properties, provider));
}
public async Task <IActionResult> LinkLogin(string provider)
{
// Clear the existing external cookie to ensure a clean login process
await HttpContext.SignOutAsync(IdentityConstants.ExternalScheme);
// Request a redirect to the external login provider to link a login for the current user
var redirectUrl = Url.Action(nameof(LinkLoginCallback));
var properties = _signInManager.ConfigureExternalAuthenticationProperties(provider, redirectUrl, _userManager.GetUserId(User));
return(new ChallengeResult(provider, properties));
}