Synnefo

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

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# without modification, are permitted provided that the following

# conditions are met:

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#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

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#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

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from django.core.urlresolvers import reverse

from django.utils.translation import ugettext as _

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 urlparse import urlunsplit, urlsplit, parse_qsl

from astakos.im.util import restrict_next

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

from astakos.im.views.decorators import cookie_fix

import astakos.im.messages as astakos_messages

from astakos.im.settings import REDIRECT_ALLOWED_SCHEMES

import logging

logger = logging.getLogger(__name__)

@require_http_methods(["GET"])

@cookie_fix

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:

        raise HttpResponseBadRequest('Missing next parameter')

    if not restrict_next(next, allowed_schemes=REDIRECT_ALLOWED_SCHEMES):

        return HttpResponseForbidden(_(

            astakos_messages.NOT_ALLOWED_NEXT_PARAM))

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

    response = HttpResponse()

    if force == '' and request.user.is_authenticated():

        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))

            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(

                username=request.user.username,

                auth_token=request.user.auth_token

            )

            auth_login(request, user)

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

        parts = list(urlsplit(next))

        parts[3] = urlencode({

            'uuid': request.user.uuid,

            '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('login')

        params = {'next': next}

        parts[3] = urlencode(params)

        url = urlunsplit(parts)

        response['Location'] = url

        response.status_code = 302

        return response