public async Task <IActionResult> OnGetLinkLoginCallbackAsync()
{
var user = await _userManager.GetUserAsync(User);
if (user == null)
{
return(NotFound($"Unable to load user with ID 'user.Id'."));
}
var info = await _signInManager.GetExternalLoginInfoAsync(user.Id.ToString());
if (info == null)
{
throw new InvalidOperationException($"Unexpected error occurred loading external login info for user with ID '{user.Id}'.");
}
var result = await _userManager.AddLoginAsync(user, info);
if (!result.Succeeded)
{
StatusMessage = "The external login was not added. External logins can only be associated with one account.";
return(RedirectToPage());
}
await _userManager.RefreshExternalLoginFeatures(user);
// Clear the existing external cookie to ensure a clean login process
await HttpContext.SignOutAsync(IdentityConstants.ExternalScheme);
StatusMessage = "The external login was added.";
return(RedirectToPage());
}