public async Task <IActionResult> OnGet(string returnUrl)
{
var context = await _interaction.GetAuthorizationContextAsync(returnUrl);
if (context?.IdP != null)
{
// if IdP is passed, then bypass showing the login screen
return(ExternalLogin(context.IdP, returnUrl));
}
await BuildLoginViewModelAsync(returnUrl, context);
if (EnableLocalLogin == false && ExternalProviders.Count() == 1)
{
// only one option for logging in
return(ExternalLogin(ExternalProviders.First().AuthenticationScheme, returnUrl));
}
return(Page());
}
public async Task <IActionResult> OnGetAsync(string returnUrl = null)
{
if (!string.IsNullOrEmpty(ErrorMessage))
{
ModelState.AddModelError(string.Empty, ErrorMessage);
}
returnUrl = returnUrl ?? Url.Content("~/");
// Clear the existing external cookie to ensure a clean login process
await HttpContext.SignOutAsync(IdentityConstants.ExternalScheme);
//ExternalLogins = (await _signInManager.GetExternalAuthenticationSchemesAsync()).ToList();
var context = await _interaction.GetAuthorizationContextAsync(returnUrl);
if (context?.IdP != null && await _schemeProvider.GetSchemeAsync(context.IdP) != null)
{
var local = context.IdP == IdentityServer4.IdentityServerConstants.LocalIdentityProvider;
EnableLocalLogin = local;
ReturnUrl = returnUrl;
Username = context?.LoginHint;
if (!local)
{
ExternalProviders = new[] { new ExternalProvider {
AuthenticationScheme = context.IdP
} };
}
if (EnableLocalLogin == false && ExternalProviders?.Count() == 1)
{
return(RedirectToAction("Challenge", "External", new { provider = ExternalLoginScheme, returnUrl }));
}
return(Page());
}
var schemes = await _schemeProvider.GetAllSchemesAsync();
var providers = schemes
.Where(x => x.DisplayName != null ||
(x.Name.Equals(AccountOptions.WindowsAuthenticationSchemeName, StringComparison.OrdinalIgnoreCase))
)
.Select(x => new ExternalProvider
{
DisplayName = x.DisplayName,
AuthenticationScheme = x.Name
}).ToList();
var allowLocal = true;
if (context?.ClientId != null)
{
var client = await _clientStore.FindEnabledClientByIdAsync(context.ClientId);
if (client != null)
{
allowLocal = client.EnableLocalLogin;
if (client.IdentityProviderRestrictions != null && client.IdentityProviderRestrictions.Any())
{
providers = providers.Where(provider => client.IdentityProviderRestrictions.Contains(provider.AuthenticationScheme)).ToList();
}
}
}
AllowRememberLogin = AccountOptions.AllowRememberLogin;
EnableLocalLogin = allowLocal && AccountOptions.AllowLocalLogin;
ReturnUrl = returnUrl;
Username = context?.LoginHint;
ExternalProviders = providers.ToArray();
return(Page());
}