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 logging

import oauth2 as oauth

import cgi

import urllib

from django.contrib import messages

from django.views.decorators.http import require_http_methods

from django.http import HttpResponseRedirect, urlencode

from django.core.urlresolvers import reverse

from django.conf import settings as django_settings

from urlparse import urlunsplit, urlsplit, parse_qsl

from astakos.im.models import AstakosUser

from astakos.im import settings

from astakos.im.views.target import get_pending_key, \

    handle_third_party_signup, handle_third_party_login, \

    init_third_party_session

from astakos.im.views.decorators import cookie_fix, requires_auth_provider

logger = logging.getLogger(__name__)

def django_setting(key, default):

    return getattr(django_settings, 'TWITTER_%s' % key.upper, default)

request_token_url = django_setting(

    'request_token_url',

    'https://api.twitter.com/oauth/request_token')

access_token_url = django_setting(

    'access_token_url',

    'https://api.twitter.com/oauth/access_token')

authenticate_url = django_setting(

    'authenticate_url',

    'https://api.twitter.com/oauth/authenticate')

@requires_auth_provider('twitter')

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

@cookie_fix

def login(request):

    init_third_party_session(request)

    force_login = request.GET.get('force_login',

                                  settings.TWITTER_AUTH_FORCE_LOGIN)

    consumer = oauth.Consumer(settings.TWITTER_TOKEN,

                              settings.TWITTER_SECRET)

    client = oauth.Client(consumer)

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

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

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

        logger.error("Invalid twitter response %s", resp)

        return HttpResponseRedirect(reverse('edit_profile'))

    oa_resp = dict(cgi.parse_qsl(content))

    if 'status' in oa_resp and oa_resp['status'] != '200':

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

        logger.error("Invalid twitter response %s", resp)

        return HttpResponseRedirect(reverse('edit_profile'))

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

    params = {

        'oauth_token': request.session['request_token']['oauth_token'],

    }

    if force_login:

        params['force_login'] = 1

    if request.GET.get('key', None):

        request.session['pending_key'] = request.GET.get('key')

    if request.GET.get('next', None):

        request.session['next_url'] = request.GET.get('next')

    url = "%s?%s" % (authenticate_url, urllib.urlencode(params))

    return HttpResponseRedirect(url)

@requires_auth_provider('twitter', login=True)

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

@cookie_fix

def authenticated(

    request,

    template='im/third_party_check_local.html',

    extra_context=None):

    if extra_context is None:

        extra_context = {}

    consumer = oauth.Consumer(settings.TWITTER_TOKEN,

                              settings.TWITTER_SECRET)

    client = oauth.Client(consumer)

    if request.GET.get('denied'):

        return HttpResponseRedirect(reverse('edit_profile'))

    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.

    parts = list(urlsplit(access_token_url))

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

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

    params['oauth_verifier'] = oauth_verifier

    parts[3] = urlencode(params)

    parameterized_url = urlunsplit(parts)

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

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

        try:

            del request.session['request_token']

        except:

            pass

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

        logger.error("Invalid twitter response %s", resp)

        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'

    try:

        return handle_third_party_login(request, 'twitter', userid,

                                        provider_info, affiliation)

    except AstakosUser.DoesNotExist, e:

        third_party_key = get_pending_key(request)

        user_info = {'affiliation': affiliation}

        return handle_third_party_signup(request, userid, 'twitter',

                                         third_party_key,

                                         provider_info,

                                         user_info,

                                         template,

                                         extra_context)