public async Task <IActionResult> OidcLogin(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "oidc-login/{platformId}")] HttpRequest req,
[Platform(PlatformId = "{platformId}")] Platform platform,
[LtiAdvantage] OidcClient oidcClient,
[DurableClient] IDurableOrchestrationClient orchestrationClient)
{
NameValueCollection redirectQueryParams = oidcClient.GetRedirectQueryParams(platform.ClientId);
string nonce = Guid.NewGuid().ToString();
string state = Guid.NewGuid().ToString();
string instanceId = await orchestrationClient.StartNewAsync(nameof(SaveState), (object)(nonce, state));
await orchestrationClient.WaitForCompletionOrCreateCheckStatusResponseAsync(req, instanceId);
redirectQueryParams["nonce"] = nonce;
redirectQueryParams["state"] = state;
string queryParams = redirectQueryParams.ToString();
string redirectUrl = $"{platform.AuthorizationUrl}?{queryParams}";
return(new RedirectResult(redirectUrl));
}