Synnefo

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import logging

import datetime

from urlparse import urlsplit, urlunsplit

from urllib import quote

from django.conf import settings

from django.http import HttpResponse

from django.utils.http import urlencode

from pithos.im.models import User

def get_or_create_user(uniq, realname, affiliation, level):

    """Find or register a user into the internal database

       and issue a token for subsequent requests.

    """

    user, created = User.objects.get_or_create(uniq=uniq,

        defaults={

            'realname': realname,

            'affiliation': affiliation,

            'level': level,

            'invitations': settings.INVITATIONS_PER_LEVEL[level]

        })

    if created:

        user.renew_token()

        user.save()

        logging.info('Created user %s', user)

    return user

def prepare_response(request, user, next='', renew=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.

    """

    if renew or user.auth_token_expires < datetime.datetime.now():

        user.renew_token()

        user.save()

    if next:

        # TODO: Avoid redirect loops.

        parts = list(urlsplit(next))

        # Do not pass on user and token if we are on the same server.

        if request.get_host() != parts[1]:

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

            next = urlunsplit(parts)

    response = HttpResponse()

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

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

    response.set_cookie('_pithos2_a', value=cookie_value, expires=expire_fmt, path='/')

    if not next:

        response['X-Auth-User'] = user.uniq

        response['X-Auth-Token'] = user.auth_token

        response.content = user.uniq + '\n' + user.auth_token + '\n'

        response.status_code = 200

    else:

        response['Location'] = next

        response.status_code = 302

    return response