Synnefo

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

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   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.

#

# 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,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

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

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

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import json

from django.http import HttpResponseBadRequest

from django.utils.translation import ugettext as _

from django.contrib import messages

from django.template import RequestContext

from django.views.decorators.http import require_http_methods

from django.http import HttpResponseRedirect

from django.core.urlresolvers import reverse

from django.core.exceptions import ImproperlyConfigured

from django.shortcuts import get_object_or_404

from urlparse import urlunsplit, urlsplit

from astakos.im.util import prepare_response, get_context

from astakos.im.views import requires_anonymous, render_response, \

        requires_auth_provider

from astakos.im.settings import ENABLE_LOCAL_ACCOUNT_MIGRATION, BASEURL

from astakos.im.models import AstakosUser, PendingThirdPartyUser

from astakos.im.forms import LoginForm

from astakos.im.activation_backends import get_backend, SimpleBackend

from astakos.im import settings

from astakos.im import auth_providers

import astakos.im.messages as astakos_messages

import logging

logger = logging.getLogger(__name__)

import oauth2 as oauth

import cgi

consumer = oauth.Consumer(settings.TWITTER_TOKEN, settings.TWITTER_SECRET)

client = oauth.Client(consumer)

request_token_url = 'http://twitter.com/oauth/request_token'

access_token_url = 'http://twitter.com/oauth/access_token'

authenticate_url = 'http://twitter.com/oauth/authenticate'

@requires_auth_provider('twitter', login=True)

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

def login(request):

    resp, content = client.request(request_token_url, "GET")

    if resp['status'] != '200':

        messages.error(request, 'Invalid Twitter response')

        return HttpResponseRedirect(reverse('edit_profile'))

    request.session['request_token'] = dict(cgi.parse_qsl(content))

    url = "%s?oauth_token=%s" % (authenticate_url,

        request.session['request_token']['oauth_token'])

    return HttpResponseRedirect(url)

@requires_auth_provider('twitter', login=True)

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

def authenticated(

    request,

    template='im/third_party_check_local.html',

    extra_context={}

):

    if not 'request_token' in request.session:

        messages.error(request, 'Twitter handshake failed')

        return HttpResponseRedirect(reverse('edit_profile'))

    token = oauth.Token(request.session['request_token']['oauth_token'],

        request.session['request_token']['oauth_token_secret'])

    client = oauth.Client(consumer, token)

    # Step 2. Request the authorized access token from Twitter.

    resp, content = client.request(access_token_url, "GET")

    if resp['status'] != '200':

        try:

          del request.session['request_token']

        except:

          pass

        messages.error(request, 'Invalid Twitter response')

        return HttpResponseRedirect(reverse('edit_profile'))

    access_token = dict(cgi.parse_qsl(content))

    userid = access_token['user_id']

    username = access_token.get('screen_name', userid)

    provider_info = {'screen_name': username}

    affiliation = 'Twitter.com'

    # an existing user accessed the view

    if request.user.is_authenticated():

        if request.user.has_auth_provider('twitter', identifier=userid):

            return HttpResponseRedirect(reverse('edit_profile'))

        # automatically add eppn provider to user

        user = request.user

        if not request.user.can_add_auth_provider('twitter',

                                                  identifier=userid):

            messages.error(request, 'Account already exists.')

            return HttpResponseRedirect(reverse('edit_profile'))

        user.add_auth_provider('twitter', identifier=userid,

                               affiliation=affiliation,

                               provider_info=provider_info)

        messages.success(request, 'Account assigned.')

        return HttpResponseRedirect(reverse('edit_profile'))

    try:

        # astakos user exists ?

        user = AstakosUser.objects.get_auth_provider_user(

            'twitter',

            identifier=userid

        )

        if user.is_active:

            # authenticate user

            return prepare_response(request,

                                    user,

                                    request.GET.get('next'),

                                    'renew' in request.GET)

        else:

            message = user.get_inactive_message()

            messages.error(request, message)

            return HttpResponseRedirect(reverse('login'))

    except AstakosUser.DoesNotExist, e:

        provider = auth_providers.get_provider('twitter')

        if not provider.is_available_for_create():

            messages.error(request,

                           _(astakos_messages.AUTH_PROVIDER_NOT_ACTIVE) % provider.get_title_display)

            return HttpResponseRedirect(reverse('login'))

        # eppn not stored in astakos models, create pending profile

        user, created = PendingThirdPartyUser.objects.get_or_create(

            third_party_identifier=userid,

            provider='twitter',

        )

        # update pending user

        user.affiliation = affiliation

        user.info = json.dumps(provider_info)

        user.generate_token()

        user.save()

        extra_context['provider'] = 'twitter'

        extra_context['provider_title'] = 'Twitter'

        extra_context['token'] = user.token

        extra_context['signup_url'] = reverse('signup') + \

                                    "?third_party_token=%s" % user.token

        return render_response(

            template,

            context_instance=get_context(request, extra_context)

        )