Synnefo

# Copyright 2011 GRNET S.A. All rights reserved.

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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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from time import time, mktime

from httplib import HTTPConnection

from urllib import quote, unquote

from django.conf import settings

from django.utils import simplejson as json

def authenticate(authentication_host, token):

    con = HTTPConnection(authentication_host)

    kwargs = {}

    kwargs['headers'] = {}

    kwargs['headers']['X-Auth-Token'] = token

    kwargs['headers']['Content-Length'] = 0

    path = '/im/authenticate'

    con.request('GET', path, **kwargs)

    response = con.getresponse()

    headers = response.getheaders()

    headers = dict((unquote(h), unquote(v)) for h,v in headers)

    length = response.getheader('content-length', None)

    data = response.read(length)

    status = int(response.status)

    if status < 200 or status >= 300:

        raise Exception(data, int(response.status))

    return json.loads(data)

def get_user_from_token(token):

    if not token:

        return None

    users = settings.AUTHENTICATION_USERS

    if users is not None:

        try:

            return {'id': 0, 'uniq': users[token].decode('utf8')}

        except:

            return None

    host = settings.AUTHENTICATION_HOST

    try:

        return authenticate(host, token)

    except:

        return None

class UserMiddleware(object):

    def process_request(self, request):

        request.user = None

        request.user_uniq = None

        # Try to find token in a parameter, in a request header, or in a cookie.

        user = get_user_from_token(request.GET.get('X-Auth-Token'))

        if not user:

            user = get_user_from_token(request.META.get('HTTP_X_AUTH_TOKEN'))

        if not user:

            return

        request.user = user

        request.user_uniq = user['uniq']