Sharing my simple design on implementing google authentication in my gae application. Comment and advice are welcome.

1. Implementing Google User Authentication
In GAE Application
By tcong@otccomputing.com

2. lImplementing Authentication on GAE app is easy.
lhttps://cloud.google.com/appengine/docs/java/config/webxml
#Security_and_Authentication
lAdd to web.xml

3. /profile/*
/admin/*
Intercepted
Google
Login Page
Your App
After success login
redirect back to your
app.
Request to URL:

4. /profile/*
/admin/*
Intercepted
Google
Login Page
Filter
After success login
redirect back to your
app.
Request to URL:
Register Page
Secured content
User login with google account may not registered to the system. I use Filter to
redirect new user to register page.

5. /profile/*
/admin/*
Intercepted
Google
Login Page
Filter
After success login
redirect back to your
app.
Request to URL:
Register Page
Secured content
RBAC
Error Page
I implemented Role Based Authentication Check (RBAC), so need to add another box
for RBAC checking.

6. lMy Filter in web.xml

7. lGoogle User Service API
lSome snippet