"""An example service authenticating with the Hub.

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

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

from jupyterhub.services.auth import HubOAuthCallbackHandler
from jupyterhub.services.auth import HubOAuthenticated
from jupyterhub.utils import url_path_join


class WhoAmIHandler(HubOAuthenticated, RequestHandler):
    @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),
            (
                url_path_join(
                    os.environ['JUPYTERHUB_SERVICE_PREFIX'], 'oauth_callback'
                ),
                HubOAuthCallbackHandler,
            ),
            (r'.*', WhoAmIHandler),
        ],
        cookie_secret=os.urandom(32),
    )

    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()