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.db.models import Q

from django.core.exceptions import ValidationError

from django.http import HttpResponseRedirect

from django.core.urlresolvers import reverse

from urlparse import urlunsplit, urlsplit

from django.utils.http import urlencode

from astakos.im.util import prepare_response, get_context, get_invitation

from astakos.im.views import requires_anonymous, render_response

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

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"

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

@requires_anonymous

def login(

    request,

    on_login_template='im/login.html',

    on_signup_template='im/third_party_check_local.html',

    extra_context=None

):

    extra_context = extra_context or {}

    tokens = request.META

    try:

        eppn = tokens[Tokens.SHIB_EPPN]

        if not eppn:

            raise KeyError

    except KeyError:

        return HttpResponseBadRequest("Missing unique token in request")

    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:

        return HttpResponseBadRequest("Missing user name in request")

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

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

    try:

        user = AstakosUser.objects.get(

            provider='shibboleth',

            third_party_identifier=eppn

        )

        if user.is_active:

            return prepare_response(request,

                                    user,

                                    request.GET.get('next'),

                                    'renew' in request.GET)

        else:

            message = _('Inactive account')

            messages.add_message(request, messages.ERROR, message)

            return render_response(on_login_template,

                                   login_form = LoginForm(request=request),

                                   context_instance=RequestContext(request))

    except AstakosUser.DoesNotExist, e:

        # First time

        try:

            user, created = PendingThirdPartyUser.objects.get_or_create(

                third_party_identifier=eppn,

                provider='shibboleth',

                defaults=dict(

                    realname=realname,

                    affiliation=affiliation,

                    email=email

                )

            )

            user.save()

        except BaseException, e:

            logger.exception(e)

            template = on_login_template

            extra_context['login_form'] = LoginForm(request=request)

            messages.error(request, _('Something went wrong.'))

        else:

            if not ENABLE_LOCAL_ACCOUNT_MIGRATION:

                url = reverse(

                    'astakos.im.target.shibboleth.signup'

                )

                parts = list(urlsplit(url))

                parts[3] = urlencode({'key': user.username})

                url = urlunsplit(parts)

                return HttpResponseRedirect(url)

            else:

                template = on_signup_template

                extra_context['key'] = user.username

        extra_context['provider']='shibboleth'

        return render_response(

            template,

            context_instance=get_context(request, extra_context)

        )

@require_http_methods(["GET"])

@requires_anonymous

def signup(

    request,

    backend=None,

    on_creation_template='im/third_party_registration.html',

    extra_context=None

):

    extra_context = extra_context or {}

    username = request.GET.get('key')

    if not username:

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

    try:

        pending = PendingThirdPartyUser.objects.get(username=username)

    except BaseException, e:

        logger.exception(e)

        return HttpResponseBadRequest(_('Invalid key.'))

    else:

        d = pending.__dict__

        d.pop('_state', None)

        d.pop('id', 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'

    return render_response(

            on_creation_template,

            context_instance=get_context(request, extra_context)

    )