Synnefo

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import datetime

from urlparse import urlsplit, urlunsplit

from urllib import quote

from functools import wraps

from django.http import HttpResponse

from django.utils.http import urlencode

from django.core.urlresolvers import reverse

from django.conf import settings

from django.contrib.auth import login, logout

def prepare_response(request, user, next='', renew=False, skip_login=False):

    """Return the unique username and the token

       as 'X-Auth-User' and 'X-Auth-Token' headers,

       or redirect to the URL provided in 'next'

       with the 'user' and 'token' as parameters.

       Reissue the token even if it has not yet

       expired, if the 'renew' parameter is present

       or user has not a valid token.

    """

    renew = renew or (not user.auth_token)

    renew = renew or (user.auth_token_expires and user.auth_token_expires < datetime.datetime.now())

    if renew:

        user.renew_token()

        user.save()

    if next:

        # TODO: Avoid redirect loops.

        parts = list(urlsplit(next))

        if not parts[1] or (parts[1] and request.get_host() != parts[1]):

            parts[3] = urlencode({'user': user.email, 'token': user.auth_token})

            next = urlunsplit(parts)

    if settings.FORCE_PROFILE_UPDATE and not user.is_verified and not user.is_superuser:

        params = ''

        if next:

            params = '?' + urlencode({'next': next})

        next = reverse('astakos.im.views.edit_profile') + params

    # user login

    if not skip_login:

        login(request, user)

    response = HttpResponse()

    # set cookie

    expire_fmt = user.auth_token_expires.strftime('%a, %d-%b-%Y %H:%M:%S %Z')        

    cookie_value = quote(user.email + '|' + user.auth_token)

    response.set_cookie(settings.COOKIE_NAME, value=cookie_value,

                        expires=expire_fmt, path='/',

                        domain = settings.COOKIE_DOMAIN)

    if not next:

        next = reverse('astakos.im.views.index')

    response['Location'] = next

    response.status_code = 302

    return response

def requires_anonymous(func):

    """

    Decorator checkes whether the request.user is an Anonymous and if not

    logouts the request.user.

    """

    @wraps(func)

    def wrapper(request, *args):

        if not request.user.is_anonymous():

            logout(request)

        return func(request, *args)

    return wrapper