[AllowAnonymous] public async Task ExternalLoginCallback(string returnUrl = null, string remoteError = null) { returnUrl = returnUrl ?? Url.Content("~/");
LoginViewModel loginViewModel = new LoginViewModel
{
ReturnUrl = returnUrl,
ExternalLogins = (await signInManager.GetExternalAuthenticationSchemesAsync()).ToList()
};
if (remoteError != null)
{
ModelState.AddModelError(string.Empty, $"Error from external provider: {remoteError}");
return View("Login", loginViewModel);
}
// Get the login information about the user from the external login provider
var info = await signInManager.GetExternalLoginInfoAsync();
if (info == null)
{
ModelState.AddModelError(string.Empty, "Error loading external login information.");
return View("Login", loginViewModel);
}
// If the user already has a login (i.e if there is a record in AspNetUserLogins
// table) then sign-in the user with this external login provider
var signInResult = await signInManager.ExternalLoginSignInAsync(info.LoginProvider,
info.ProviderKey, isPersistent: false, bypassTwoFactor: true);
if (signInResult.Succeeded)
{
return LocalRedirect(returnUrl);
}
// If there is no record in AspNetUserLogins table, the user may not have
// a local account
else
{
// Get the email claim value
var email = info.Principal.FindFirstValue(ClaimTypes.Email);
if (email != null)
{
// Create a new user without password if we do not have a user already
var user = await userManager.FindByEmailAsync(email);
if (user == null)
{
user = new IdentitiyUser
{
UserName = info.Principal.FindFirstValue(ClaimTypes.Email),
Email = info.Principal.FindFirstValue(ClaimTypes.Email)
};
await userManager.CreateAsync(user);
// await userManager.UpdateAsync(user);
}
// Add a login (i.e insert a row for the user in AspNetUserLogins table)
await userManager.AddLoginAsync(user, info);
await signInManager.SignInAsync(user, isPersistent: false);
return LocalRedirect(returnUrl);
}
// If we cannot find the user email we cannot continue
ViewBag.ErrorTitle = $"Email claim not received from: {info.LoginProvider}";
ViewBag.ErrorMessage = "Please contact support on [email protected]";
return View("Error");
}
}
This is the error
An unhandled exception occurred while processing the request. ArgumentNullException: Value cannot be null. (Parameter 'value') System.Security.Claims.Claim..ctor(string type, string value, string valueType, string issuer, string originalIssuer, ClaimsIdentity subject, string propertyKey, string propertyValue)
Stack Query Cookies Headers Routing ArgumentNullException: Value cannot be null. (Parameter 'value') System.Security.Claims.Claim..ctor(string type, string value, string valueType, string issuer, string originalIssuer, ClaimsIdentity subject, string propertyKey, string propertyValue) System.Security.Claims.Claim..ctor(string type, string value) Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory.GenerateClaimsAsync(TUser user) Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory<TUser, TRole>.GenerateClaimsAsync(TUser user) Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory.CreateAsync(TUser user) Microsoft.AspNetCore.Identity.SignInManager.CreateUserPrincipalAsync(TUser user) Microsoft.AspNetCore.Identity.SignInManager.SignInWithClaimsAsync(TUser user, AuthenticationProperties authenticationProperties, IEnumerable additionalClaims) EmployeeManagement.Controllers.AccountController.ExternalLoginCallback(string returnUrl, string remoteError) in AccountController.cs + await signInManager.SignInAsync(user, isPersistent: false); Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor+TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, object controller, object[] arguments) System.Threading.Tasks.ValueTask.get_Result() System.Runtime.CompilerServices.ValueTaskAwaiter.GetResult()
