#!/usr/bin/env python

from flask import Flask, request, Response
import ddns
import cfg_parser
import auth
from IPy import IP

cfg_file="/srv/http/lden.org/ddns/ddns/ddns.cfg"
cfg = cfg_parser.read_config(cfg_file)

auth.auth_cfg = cfg['users']
ddns.zone_cfg = cfg['zones']
ddns.gen_keyring(cfg['dnskeys'])

app = Flask(__name__)

@app.route("/nic/update")
@auth.require_auth
def dyndns():
	if request.method != 'GET':
		return "badagent"

	if not request.args.has_key('hostname'):
		return "nohost"

	if len(request.args.getlist('hostname')) > 1:
		return "numhost"

	if not request.args.has_key('myip'):
		return "nohost"

	hostname = request.args.get('hostname')
	if not '.' in hostname:
		return "notfqdn"

	zone_name = hostname[hostname.find('.')+1:]
	if zone_name[-1] != '.':
		zone_name += '.'

	hostname = hostname[0:hostname.find('.')]

	try:
		ip = IP(request.args.get('myip'))
	except ValueError:
		return "nohost"

	for zone in cfg['zones']:
		if zone_name == zone['name']:
			for domain in zone['domains']:
				if domain['domain'] == hostname:
					for user in domain['users']:
						if request.authorization.username == user['username']:
							ddns.update_dns(zone_name, hostname, ip)
							return "good"
					return auth.authenticate("!yours")
			return "nohost"
	return "nohost"

if __name__ == "__main__":
	app.run(host="0.0.0.0", debug=True)