Circuits Framework SSL web with redirector

sslserver.py

#!/usr/bin/env python3
from circuits import Debugger, BaseComponent, handler
from circuits.web import Controller, Server
from circuits.web.errors import redirect
from urllib.parse import urlparse, urlunparse


class Root(Controller):
    def index(self):
        return "Hello World!"


class RedirectToSecure(BaseComponent):
    def __init__(self, secure_port, **kwargs):
        super().__init__(**kwargs)
        self.secure_port = secure_port

    @handler("request", priority=0.9)
    def _on_request(self, event, request, response):
        if request.uri._scheme == b'http':
            parts = urlparse(request.uri.utf8())
            new_parts = parts._replace(scheme=b'https')
            if b':' in parts.netloc:
                (host, port) = parts.netloc.split(b':', 2)
            else:
                host = parts.netloc
                port = None
            if self.secure_port == 443:
                port = None
            else:
                port = str(self.secure_port).encode('utf-8')
            if port:
                new_netloc = b'%s:%s' % (host, port)
            else:
                new_netloc = host
            new_parts = new_parts._replace(netloc=new_netloc)
            try:
                return redirect(request, response, (urlunparse(new_parts),), 301)
            finally:
                event.stop()


app = Server(("0.0.0.0", 8443), secure=True, certfile="cert.pem") + \
      Debugger() + Root() + \
      Server(8080, channel="onlysecure") + RedirectToSecure(8443, channel="onlysecure")
app.run()