Synnefo » astakos

# Copyright 2011-2012 GRNET S.A. All rights reserved.

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#      disclaimer.

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from django.core.urlresolvers import reverse

from django.shortcuts import redirect

from django.utils.translation import ugettext as _

from django.contrib import messages

from django.utils.http import urlencode

from django.contrib.auth import authenticate

from django.http import (

    HttpResponse, HttpResponseBadRequest, HttpResponseForbidden

)

from django.core.exceptions import ValidationError

from django.views.decorators.http import require_http_methods

from urllib import quote

from urlparse import urlunsplit, urlsplit, urlparse, parse_qsl

from astakos.im.settings import COOKIE_DOMAIN

from astakos.im.util import restrict_next

from astakos.im.functions import login as auth_login, logout

import logging

logger = logging.getLogger(__name__)

@require_http_methods(["GET", "POST"])

def login(request):

    """

    If there is no ``next`` request parameter redirects to astakos index page

    displaying an error message.

    If the request user is authenticated and has signed the approval terms,

    redirects to `next` request parameter. If not, redirects to approval terms

    in order to return back here after agreeing with the terms.

    Otherwise, redirects to login in order to return back here after successful login.

    """

    next = request.GET.get('next')

    if not next:

        return HttpResponseBadRequest(_('No next parameter'))

    if not restrict_next(

        next, domain=COOKIE_DOMAIN, allowed_schemes=('pithos',)

    ):

        return HttpResponseForbidden(_('Not allowed next parameter'))

    force = request.GET.get('force', None)

    response = HttpResponse()

    if force == '':

        logout(request)

    if request.user.is_authenticated():

        # if user has not signed the approval terms

        # redirect to approval terms with next the request path

        if not request.user.signed_terms():

            # first build next parameter

            parts = list(urlsplit(request.build_absolute_uri()))

            params = dict(parse_qsl(parts[3], keep_blank_values=True))

            # delete force parameter

            parts[3] = urlencode(params)

            next = urlunsplit(parts)

            # build url location

            parts[2] = reverse('latest_terms')

            params = {'next':next}

            parts[3] = urlencode(params)

            url = urlunsplit(parts)

            response['Location'] = url

            response.status_code = 302

            return response

        renew = request.GET.get('renew', None)

        if renew == '':

            request.user.renew_token(

                flush_sessions=True,

                current_key=request.session.session_key

            )

            try:

                request.user.save()

            except ValidationError, e:

                return HttpResponseBadRequest(e)

            # authenticate before login

            user = authenticate(email=request.user.email, auth_token=request.user.auth_token)

            auth_login(request, user)

            logger.info('Token reset for %s' % request.user.email)

        parts = list(urlsplit(next))

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

        url = urlunsplit(parts)

        response['Location'] = url

        response.status_code = 302

        return response

    else:

        # redirect to login with next the request path

        # first build next parameter

        parts = list(urlsplit(request.build_absolute_uri()))

        params = dict(parse_qsl(parts[3], keep_blank_values=True))

        # delete force parameter

        if 'force' in params:

            del params['force']

        parts[3] = urlencode(params)

        next = urlunsplit(parts)

        # build url location

        parts[2] = reverse('astakos.im.views.index')

        params = {'next':next}

        parts[3] = urlencode(params)

        url = urlunsplit(parts)

        response['Location'] = url

        response.status_code = 302

        return response