lib 1013814 // google http client
lib 1013815 // google api client
lib 1013816 // google oauth client
lib 1013817 // jackson
lib 1013818 // google jackson2
lib 1013819 // google http client appengine

import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken;
import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken.Payload;
import com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.http.javanet.NetHttpTransport;

static Payload googleVerifyUserToken2(S clientID, S token) ctex {
  print("Google verify started.");
  
  new NetHttpTransport transport;
  
  GoogleIdTokenVerifier verifier = new GoogleIdTokenVerifier.Builder(transport, new JacksonFactory)
    .setAudience(Collections.singletonList(clientID))
    .build();
  
  GoogleIdToken idToken = verifier.verify(token);
  if (idToken != null) {
    Payload payload = idToken.getPayload();
    print("Google verify confirmed: " + payload.getEmail());
    ret payload;
  }
  
  print("Google verify failed");
  null;
}