private async Task <bool> UnlinkAccountForUser(string userId, string loginProvider, string providerKey)
{
string ownerAccount = await Logins.GetUserId(loginProvider, providerKey);
if (ownerAccount == userId)
{
if ((await Logins.GetLogins(userId)).Count > 1)
{
await Logins.Remove(userId, loginProvider, providerKey);
return(true);
}
}
return(false);
}
public async Task <ActionResult> ExternalLoginCallback(string loginProvider, string returnUrl)
{
// Get the information about the user from the external login provider
ClaimsIdentity id = await HttpContext.GetExternalIdentity();
if (id == null)
{
return(View("ExternalLoginFailure"));
}
// Make sure the external identity is from the loginProvider we expect
Claim providerKeyClaim = id.FindFirst(ClaimTypes.NameIdentifier);
if (providerKeyClaim == null || providerKeyClaim.Issuer != loginProvider)
{
return(View("ExternalLoginFailure"));
}
// Succeeded so we should be able to lookup the local user name and sign them in
string providerKey = providerKeyClaim.Value;
string userId = await Logins.GetUserId(loginProvider, providerKey);
if (!String.IsNullOrEmpty(userId))
{
await SignIn(userId, id.Claims, isPersistent : false);
}
else
{
// No local user for this account
if (User.Identity.IsAuthenticated)
{
// If the current user is logged in, just add the new account
await Logins.Add(new UserLogin(User.Identity.GetUserId(), loginProvider, providerKey));
}
else
{
ViewBag.ReturnUrl = returnUrl;
return(View("ExternalLoginConfirmation", new ExternalLoginConfirmationViewModel {
UserName = id.Name, LoginProvider = loginProvider
}));
}
}
return(RedirectToLocal(returnUrl));
}
public async Task <ActionResult> Login(LoginViewModel model, string returnUrl)
{
if (ModelState.IsValid)
{
// Validate the user password
if (await Secrets.Validate(model.UserName, model.Password))
{
string userId = await Logins.GetUserId(IdentityConfig.LocalLoginProvider, model.UserName);
await SignIn(userId, model.RememberMe);
return(RedirectToLocal(returnUrl));
}
}
// If we got this far, something failed, redisplay form
ModelState.AddModelError(String.Empty, "The user name or password provided is incorrect.");
return(View(model));
}