Simple example how to implement Authentication using login form and sessions based on cookies.

Application.kt contains all the configuration:

• Session configuration in install(Sessions) section
• Two types of auth in install(Authentication) section
  • session - needed to auth a user using his or her cookies
  • form - needed to auth a user on login endpoint using username and password saving his session using cookies
• route("/login") - auth a user via auth section, takes his or her principal and puts it into the session to make possible to auth via the session and cookies
• route("/user_info") - just takes the principal and returns it to the user