A proof of concept for JWT based user login.
The concepts behind Json Web Tokens (JWT) can be explored at jwt.io.
The quickest and simplest way to get the app up and running is to use the PHP embedded server.
ex. php -S 127.0.0.1:8080 -t public
The hard-coded credentials are foo@bar.com and baz.
After you have logged in you can get the token from the usertoken cookie and then pass the value
into the debugger at jwt.io/#debugger-io. Though at the time
of this writing that tool does not support the HS512 algorithm I used for the signature.