Synnefo

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

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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

import astakos.im.messages as astakos_messages

import logging

logger = logging.getLogger(__name__)

class Tokens:

    # these are mapped by the Shibboleth SP software

    SHIB_EPPN = "HTTP_EPPN"  # eduPersonPrincipalName

    SHIB_NAME = "HTTP_SHIB_INETORGPERSON_GIVENNAME"

    SHIB_SURNAME = "HTTP_SHIB_PERSON_SURNAME"

    SHIB_CN = "HTTP_SHIB_PERSON_COMMONNAME"

    SHIB_DISPLAYNAME = "HTTP_SHIB_INETORGPERSON_DISPLAYNAME"

    SHIB_EP_AFFILIATION = "HTTP_SHIB_EP_AFFILIATION"

    SHIB_SESSION_ID = "HTTP_SHIB_SESSION_ID"

    SHIB_MAIL = "HTTP_SHIB_MAIL"

@requires_auth_provider('local', login=True)

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

def login(

    request,

    template='im/third_party_check_local.html',

    extra_context=None):

    extra_context = extra_context or {}

    tokens = request.META

    try:

        eppn = tokens.get(Tokens.SHIB_EPPN)

        if not eppn:

            raise KeyError(_(astakos_messages.SHIBBOLETH_MISSING_EPPN))

        if Tokens.SHIB_DISPLAYNAME in tokens:

            realname = tokens[Tokens.SHIB_DISPLAYNAME]

        elif Tokens.SHIB_CN in tokens:

            realname = tokens[Tokens.SHIB_CN]

        elif Tokens.SHIB_NAME in tokens and Tokens.SHIB_SURNAME in tokens:

            realname = tokens[Tokens.SHIB_NAME] + ' ' + tokens[Tokens.SHIB_SURNAME]

        else:

            raise KeyError(_(astakos_messages.SHIBBOLETH_MISSING_NAME))

    except KeyError, e:

        # invalid shibboleth headers, redirect to login, display message

        messages.error(request, e.message)

        return HttpResponseRedirect(reverse('login'))

    affiliation = tokens.get(Tokens.SHIB_EP_AFFILIATION, '')

    email = tokens.get(Tokens.SHIB_MAIL, '')

    # an existing user accessed the view

    if request.user.is_authenticated():

        if request.user.has_auth_provider('shibboleth', identifier=eppn):

            return HttpResponseRedirect(reverse('edit_profile'))

        # automatically add eppn provider to user

        user = request.user

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

                                                  identifier=eppn):

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

            return HttpResponseRedirect(reverse('edit_profile'))

        user.add_auth_provider('shibboleth', identifier=eppn)

        return HttpResponseRedirect(reverse('edit_profile'))

    try:

        # astakos user exists ?

        user = AstakosUser.objects.get_auth_provider_user(

            'shibboleth',

            identifier=eppn

        )

        if user.is_active:

            # authenticate user

            return prepare_response(request,

                                    user,

                                    request.GET.get('next'),

                                    'renew' in request.GET)

        elif not user.activation_sent:

            message = _('Your request is pending activation')

                        #TODO: use astakos_messages

            if not settings.MODERATION_ENABLED:

                url = user.get_resend_activation_url()

                msg_extra = _('<a href="%s">Resend activation email?</a>') % url

                message = message + u' ' + msg_extra

            messages.error(request, message)

            return HttpResponseRedirect(reverse('login'))

        else:

                        #TODO: use astakos_messages

            message = _(u'Account disabled. Please contact support')

            messages.error(request, message)

            return HttpResponseRedirect(reverse('login'))

    except AstakosUser.DoesNotExist, e:

                #TODO: use astakos_messages

        # eppn not stored in astakos models, create pending profile

        user, created = PendingThirdPartyUser.objects.get_or_create(

            third_party_identifier=eppn,

            provider='shibboleth',

        )

        # update pending user

        user.realname = realname

        user.affiliation = affiliation

        user.email = email

        user.generate_token()

        user.save()

        extra_context['provider'] = 'shibboleth'

        extra_context['token'] = user.token

        extra_context['signup_url'] = reverse('shibboleth_signup', args=(user.token,))

        return render_response(

            template,

            context_instance=get_context(request, extra_context)

        )

@requires_auth_provider('local', login=True, create=True)

@require_http_methods(["GET"])

@requires_anonymous

def signup(

    request,

    token,

    backend=None,

    on_creation_template='im/third_party_registration.html',

    extra_context=None):

    extra_context = extra_context or {}

    if not token:

                #TODO: use astakos_messages

        return HttpResponseBadRequest(_('Missing key parameter.'))

    pending = get_object_or_404(PendingThirdPartyUser, token=token)

    d = pending.__dict__

    d.pop('_state', None)

    d.pop('id', None)

    d.pop('token', None)

    d.pop('created', None)

    user = AstakosUser(**d)

    try:

        backend = backend or get_backend(request)

    except ImproperlyConfigured, e:

        messages.error(request, e)

    else:

        extra_context['form'] = backend.get_signup_form(

            provider='shibboleth',

            instance=user

        )

    extra_context['provider'] = 'shibboleth'

    extra_context['third_party_token'] = token

    return render_response(

            on_creation_template,

            context_instance=get_context(request, extra_context)

    )