public async Task ExternalLoginCallback()

in Source/WebApp-Service-Provider-DotNet/Controllers/AccountController.cs [161:205]
41 lines of code
5 McCabe index (conditional complexity)

        public async Task<IActionResult> ExternalLoginCallback(string returnUrl = null)
        {
            var info = await _signInManager.GetExternalLoginInfoAsync();
            if (info == null)
            {
                return RedirectToAction(nameof(Login));
            }
            // acr_values are mapped to this authnclassreference claim by .NET
            string acrValues = info.Principal?.FindFirst("http://schemas.microsoft.com/claims/authnclassreference")?.Value;
            if (!Validation.IsEIdasLevelMet(acrValues, _config.EIdasLevel))
            {
                await HttpContext.SignOutAsync(FranceConnectConfiguration.ProviderScheme, new AuthenticationProperties { RedirectUri = Url.Action(nameof(Login), null, null, Request.Scheme) });
                throw new UnauthorizedAccessException("Requested EIdas level not met");
            }
            // Sign in the user with this external login provider if the user already has a login.
            var user = await _userManager.FindByLoginAsync(info.LoginProvider, info.ProviderKey);
            if (user != null)
            {
                if (await _userManager.IsLockedOutAsync(user))
                {
                    return View("Lockout");
                }
                await _signInManager.SignInAsync(user, info.AuthenticationProperties, info.LoginProvider);
                _logger.LogInformation(5, "User logged in with {Name} provider.", info.LoginProvider);
                return RedirectToLocal(returnUrl ?? Url.Action(nameof(ManageController.PivotIdentity), "Manage"));
            }
            else
            {
                // If the user does not have an account, then ask the user to create an account.
                ViewData["ReturnUrl"] = returnUrl;
                ViewData["LoginProvider"] = info.ProviderDisplayName;

                DateTime.TryParseExact(info.Principal.FindFirstValue("birthdate"), "yyyy-MM-dd", new CultureInfo("fr-FR"), DateTimeStyles.AssumeUniversal, out DateTime parsedBirthDate);
                ExternalLoginConfirmationViewModel model = new()
                {
                    Email = info.Principal.FindFirstValue("email"),
                    Gender = info.Principal.FindFirstValue("gender"),
                    Birthdate = parsedBirthDate,
                    PreferredName = info.Principal.FindFirstValue("preferred_username"),
                    GivenName = info.Principal.FindFirstValue("given_name"),
                    FamilyName = info.Principal.FindFirstValue("family_name")
                };
                return View("ExternalLoginConfirmation", model);
            }
        }