"""An example service authenticating with the Hub.

This serves `/services/whoami/`, authenticated with the Hub, showing the user their own info.
"""
from getpass import getuser
import json
import os
from urllib.parse import urlparse

from tornado.ioloop import IOLoop
from tornado.httpserver import HTTPServer
from tornado.web import RequestHandler, Application, authenticated

from jupyterhub.services.auth import HubAuthenticated


class WhoAmIHandler(HubAuthenticated, RequestHandler):
    hub_users = {getuser()} # the users allowed to access me

    @authenticated
    def get(self):
        user_model = self.get_current_user()
        self.set_header('content-type', 'application/json')
        self.write(json.dumps(user_model, indent=1, sort_keys=True))

def main():
    app = Application([
        (os.environ['JUPYTERHUB_SERVICE_PREFIX'] + '/?', WhoAmIHandler),
        (r'.*', WhoAmIHandler),
    ])
    
    http_server = HTTPServer(app)
    url = urlparse(os.environ['JUPYTERHUB_SERVICE_URL'])

    http_server.listen(url.port, url.hostname)

    IOLoop.current().start()

if __name__ == '__main__':
    main()