public async Task <IActionResult> OnGetCallbackAsync(string returnUrl = null, string remoteError = null)
{
returnUrl = returnUrl ?? Url.Content("~/");
if (remoteError != null)
{
ErrorMessage = $"Error from external provider: {remoteError}";
return(RedirectToPage("./Login", new { ReturnUrl = returnUrl }));
}
var info = await _signInManager.GetExternalLoginInfoAsync();
if (info == null)
{
ErrorMessage = "Error loading external login information.";
return(RedirectToPage("./Login", new { ReturnUrl = returnUrl }));
}
_tokenStore.HarvestAndStore();
// this is so that downstream handler in the pipeline can get access to the current Info.
_externalLoginProvider.ExternalLoginInfo = info;
// Sign in the user with this external login provider if the user already has a login.
var result = await _signInManager.ExternalLoginSignInAsync(info.LoginProvider, info.ProviderKey, isPersistent : false, bypassTwoFactor : true);
if (result.Succeeded)
{
_logger.LogInformation("{Name} logged in with {LoginProvider} provider.", info.Principal.Identity.Name, info.LoginProvider);
return(LocalRedirect(returnUrl));
}
if (result.IsLockedOut)
{
return(RedirectToPage("./Lockout"));
}
else
{
var user = await _userManager.FindByIdAsync(info.ProviderKey);
if (user != null)
{
var addResult = await _userManager.AddLoginAsync(user, info);
if (!addResult.Succeeded)
{
throw new InvalidOperationException($"Unexpected error occurred adding external login for user with ID '{user.Id}'.");
}
result = await _signInManager.ExternalLoginSignInAsync(info.LoginProvider, info.ProviderKey, isPersistent : false, bypassTwoFactor : true);
if (result.Succeeded)
{
_logger.LogInformation("{Name} logged in with {LoginProvider} provider.", info.Principal.Identity.Name, info.LoginProvider);
return(LocalRedirect(returnUrl));
}
throw new InvalidOperationException($"Unexpected error occurred adding external login for user with ID '{user.Id}'.");
}
// If the user does not have an account, then ask the user to create an account.
ReturnUrl = returnUrl;
LoginProvider = info.LoginProvider;
if (info.Principal.HasClaim(c => c.Type == ClaimTypes.Email))
{
Input = new InputModel
{
Email = info.Principal.FindFirstValue(ClaimTypes.Email)
};
}
return(Page());
}
}
