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

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#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

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#      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

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# The views and conclusions contained in the software and

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# or implied, of GRNET S.A.

import logging

import inflect

engine = inflect.engine()

from urllib import quote

from django.shortcuts import get_object_or_404

from django.contrib import messages

from django.contrib.auth.decorators import login_required

from django.contrib.auth.models import User

from django.core.urlresolvers import reverse

from django.db import transaction

from django.http import HttpResponse, HttpResponseRedirect, Http404

from django.shortcuts import redirect

from django.utils.translation import ugettext as _

from django.core.exceptions import PermissionDenied

from django.views.decorators.http import require_http_methods

from django.utils import simplejson as json

import astakos.im.messages as astakos_messages

from astakos.im import activation_backends

from astakos.im.models import AstakosUser, ApprovalTerms, EmailChange, \

    AstakosUserAuthProvider, PendingThirdPartyUser, Service

from astakos.im.util import get_context, prepare_response, get_query, \

    restrict_next

from astakos.im.forms import LoginForm, InvitationForm, FeedbackForm, \

    SignApprovalTermsForm, EmailChangeForm

from astakos.im.forms import ExtendedProfileForm as ProfileForm

from astakos.im.functions import send_feedback, logout as auth_logout, \

    invite as invite_func

from astakos.im import settings

from astakos.im import presentation

from astakos.im import auth_providers as auth

from astakos.im import quotas

from astakos.im.views.util import render_response, _resources_catalog

from astakos.im.views.decorators import cookie_fix, signed_terms_required,\

    required_auth_methods_assigned, valid_astakos_user_required

logger = logging.getLogger(__name__)

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

@cookie_fix

@signed_terms_required

def index(request, login_template_name='im/login.html', profile_template_name='im/profile.html', extra_context=None):

    """

    If there is logged on user renders the profile page otherwise renders login page.

    **Arguments**

    ``login_template_name``

        A custom login template to use. This is optional; if not specified,

        this will default to ``im/login.html``.

    ``profile_template_name``

        A custom profile template to use. This is optional; if not specified,

        this will default to ``im/profile.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    im/profile.html or im/login.html or ``template_name`` keyword argument.

    """

    extra_context = extra_context or {}

    template_name = login_template_name

    if request.user.is_authenticated():

        return HttpResponseRedirect(reverse('astakos.im.views.edit_profile'))

    third_party_token = request.GET.get('key', False)

    if third_party_token:

        messages.info(request, astakos_messages.AUTH_PROVIDER_LOGIN_TO_ADD)

    return render_response(

        template_name,

        login_form = LoginForm(request=request),

        context_instance = get_context(request, extra_context)

    )

@require_http_methods(["POST"])

@cookie_fix

@valid_astakos_user_required

def update_token(request):

    """

    Update api token view.

    """

    user = request.user

    user.renew_token()

    user.save()

    messages.success(request, astakos_messages.TOKEN_UPDATED)

    return HttpResponseRedirect(reverse('edit_profile'))

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

@cookie_fix

@valid_astakos_user_required

@transaction.commit_manually

def invite(request, template_name='im/invitations.html', extra_context=None):

    """

    Allows a user to invite somebody else.

    In case of GET request renders a form for providing the invitee information.

    In case of POST checks whether the user has not run out of invitations and then

    sends an invitation email to singup to the service.

    The view uses commit_manually decorator in order to ensure the number of the

    user invitations is going to be updated only if the email has been successfully sent.

    If the user isn't logged in, redirects to settings.LOGIN_URL.

    **Arguments**

    ``template_name``

        A custom template to use. This is optional; if not specified,

        this will default to ``im/invitations.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    im/invitations.html or ``template_name`` keyword argument.

    **Settings:**

    The view expectes the following settings are defined:

    * LOGIN_URL: login uri

    """

    extra_context = extra_context or {}

    status = None

    message = None

    form = InvitationForm()

    inviter = request.user

    if request.method == 'POST':

        form = InvitationForm(request.POST)

        if inviter.invitations > 0:

            if form.is_valid():

                try:

                    email = form.cleaned_data.get('username')

                    realname = form.cleaned_data.get('realname')

                    invite_func(inviter, email, realname)

                    message = _(astakos_messages.INVITATION_SENT) % locals()

                    messages.success(request, message)

                except Exception, e:

                    transaction.rollback()

                    raise

                else:

                    transaction.commit()

        else:

            message = _(astakos_messages.MAX_INVITATION_NUMBER_REACHED)

            messages.error(request, message)

    sent = [{'email': inv.username,

             'realname': inv.realname,

             'is_consumed': inv.is_consumed}

            for inv in request.user.invitations_sent.all()]

    kwargs = {'inviter': inviter,

              'sent': sent}

    context = get_context(request, extra_context, **kwargs)

    return render_response(template_name,

                           invitation_form=form,

                           context_instance=context)

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

@required_auth_methods_assigned(allow_access=True)

@login_required

@cookie_fix

@signed_terms_required

def edit_profile(request, template_name='im/profile.html', extra_context=None):

    """

    Allows a user to edit his/her profile.

    In case of GET request renders a form for displaying the user information.

    In case of POST updates the user informantion and redirects to ``next``

    url parameter if exists.

    If the user isn't logged in, redirects to settings.LOGIN_URL.

    **Arguments**

    ``template_name``

        A custom template to use. This is optional; if not specified,

        this will default to ``im/profile.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    im/profile.html or ``template_name`` keyword argument.

    **Settings:**

    The view expectes the following settings are defined:

    * LOGIN_URL: login uri

    """

    extra_context = extra_context or {}

    form = ProfileForm(

        instance=request.user,

        session_key=request.session.session_key

    )

    extra_context['next'] = request.GET.get('next')

    if request.method == 'POST':

        form = ProfileForm(

            request.POST,

            instance=request.user,

            session_key=request.session.session_key

        )

        if form.is_valid():

            try:

                prev_token = request.user.auth_token

                user = form.save(request=request)

                next = restrict_next(

                    request.POST.get('next'),

                    domain=settings.COOKIE_DOMAIN

                )

                msg = _(astakos_messages.PROFILE_UPDATED)

                messages.success(request, msg)

                if form.email_changed:

                    msg = _(astakos_messages.EMAIL_CHANGE_REGISTERED)

                    messages.success(request, msg)

                if form.password_changed:

                    msg = _(astakos_messages.PASSWORD_CHANGED)

                    messages.success(request, msg)

                if next:

                    return redirect(next)

                else:

                    return redirect(reverse('edit_profile'))

            except ValueError, ve:

                messages.success(request, ve)

    elif request.method == "GET":

        request.user.is_verified = True

        request.user.save()

    # existing providers

    user_providers = request.user.get_enabled_auth_providers()

    user_disabled_providers = request.user.get_disabled_auth_providers()

    # providers that user can add

    user_available_providers = request.user.get_available_auth_providers()

    extra_context['services'] = Service.catalog().values()

    return render_response(template_name,

                           profile_form=form,

                           user_providers=user_providers,

                           user_disabled_providers=user_disabled_providers,

                           user_available_providers=user_available_providers,

                           context_instance=get_context(request,

                                                          extra_context))

@transaction.commit_manually

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

@cookie_fix

def signup(request, template_name='im/signup.html', on_success='index',

           extra_context=None, activation_backend=None):

    """

    Allows a user to create a local account.

    In case of GET request renders a form for entering the user information.

    In case of POST handles the signup.

    The user activation will be delegated to the backend specified by the

    ``activation_backend`` keyword argument if present, otherwise to the

    ``astakos.im.activation_backends.InvitationBackend`` if

    settings.ASTAKOS_INVITATIONS_ENABLED is True or

    ``astakos.im.activation_backends.SimpleBackend`` if not (see

    activation_backends);

    Upon successful user creation, if ``next`` url parameter is present the

    user is redirected there otherwise renders the same page with a success

    message.

    On unsuccessful creation, renders ``template_name`` with an error message.

    **Arguments**

    ``template_name``

        A custom template to render. This is optional;

        if not specified, this will default to ``im/signup.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    ``on_success``

        Resolvable view name to redirect on registration success.

    **Template:**

    im/signup.html or ``template_name`` keyword argument.

    """

    extra_context = extra_context or {}

    if request.user.is_authenticated():

        logger.info("%s already signed in, redirect to index",

                    request.user.log_display)

        return HttpResponseRedirect(reverse('index'))

    provider = get_query(request).get('provider', 'local')

    if not auth.get_provider(provider).get_create_policy:

        logger.error("%s provider not available for signup", provider)

        raise PermissionDenied

    instance = None

    # user registered using third party provider

    third_party_token = request.REQUEST.get('third_party_token', None)

    unverified = None

    if third_party_token:

        # retreive third party entry. This was created right after the initial

        # third party provider handshake.

        pending = get_object_or_404(PendingThirdPartyUser,

                                    token=third_party_token)

        provider = pending.provider

        # clone third party instance into the corresponding AstakosUser

        instance = pending.get_user_instance()

        get_unverified = AstakosUserAuthProvider.objects.unverified

        # check existing unverified entries

        unverified = get_unverified(pending.provider,

                                    identifier=pending.third_party_identifier)

        if unverified and request.method == 'GET':

            messages.warning(request, unverified.get_pending_registration_msg)

            if unverified.user.moderated:

                messages.warning(request,

                                 unverified.get_pending_resend_activation_msg)

            else:

                messages.warning(request,

                                 unverified.get_pending_moderation_msg)

    # prepare activation backend based on current request

    if not activation_backend:

        activation_backend = activation_backends.get_backend()

    form_kwargs = {'instance': instance}

    if third_party_token:

        form_kwargs['third_party_token'] = third_party_token

    form = activation_backend.get_signup_form(

        provider, None, **form_kwargs)

    if request.method == 'POST':

        form = activation_backend.get_signup_form(

            provider,

            request.POST,

            **form_kwargs)

        if form.is_valid():

            commited = False

            try:

                user = form.save(commit=False)

                # delete previously unverified accounts

                if AstakosUser.objects.user_exists(user.email):

                    AstakosUser.objects.get_by_identifier(user.email).delete()

                # store_user so that user auth providers get initialized

                form.store_user(user, request)

                result = activation_backend.handle_registration(user)

                if result.status == \

                        activation_backend.Result.PENDING_MODERATION:

                    # user should be warned that his account is not active yet

                    status = messages.WARNING

                else:

                    status = messages.SUCCESS

                message = result.message

                activation_backend.send_result_notifications(result, user)

                # commit user entry

                transaction.commit()

                # commited flag

                # in case an exception get raised from this point

                commited = True

                if user and user.is_active:

                    # activation backend directly activated the user

                    # log him in

                    next = request.POST.get('next', '')

                    response = prepare_response(request, user, next=next)

                    return response

                messages.add_message(request, status, message)

                return HttpResponseRedirect(reverse(on_success))

            except Exception, e:

                if not commited:

                    transaction.rollback()

                raise

    return render_response(template_name,

                           signup_form=form,

                           third_party_token=third_party_token,

                           provider=provider,

                           context_instance=get_context(request, extra_context))

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

@required_auth_methods_assigned(allow_access=True)

@login_required

@cookie_fix

@signed_terms_required

def feedback(request, template_name='im/feedback.html', email_template_name='im/feedback_mail.txt', extra_context=None):

    """

    Allows a user to send feedback.

    In case of GET request renders a form for providing the feedback information.

    In case of POST sends an email to support team.

    If the user isn't logged in, redirects to settings.LOGIN_URL.

    **Arguments**

    ``template_name``

        A custom template to use. This is optional; if not specified,

        this will default to ``im/feedback.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    im/signup.html or ``template_name`` keyword argument.

    **Settings:**

    * LOGIN_URL: login uri

    """

    extra_context = extra_context or {}

    if request.method == 'GET':

        form = FeedbackForm()

    if request.method == 'POST':

        if not request.user:

            return HttpResponse('Unauthorized', status=401)

        form = FeedbackForm(request.POST)

        if form.is_valid():

            msg = form.cleaned_data['feedback_msg']

            data = form.cleaned_data['feedback_data']

            send_feedback(msg, data, request.user, email_template_name)

            message = _(astakos_messages.FEEDBACK_SENT)

            messages.success(request, message)

            return HttpResponseRedirect(reverse('feedback'))

    return render_response(template_name,

                           feedback_form=form,

                           context_instance=get_context(request,

                                                        extra_context))

@require_http_methods(["GET"])

@cookie_fix

def logout(request, template='registration/logged_out.html',

           extra_context=None):

    """

    Wraps `django.contrib.auth.logout`.

    """

    extra_context = extra_context or {}

    response = HttpResponse()

    if request.user.is_authenticated():

        email = request.user.email

        auth_logout(request)

    else:

        response['Location'] = reverse('index')

        response.status_code = 301

        return response

    next = restrict_next(

        request.GET.get('next'),

        domain=settings.COOKIE_DOMAIN

    )

    if next:

        response['Location'] = next

        response.status_code = 302

    elif settings.LOGOUT_NEXT:

        response['Location'] = settings.LOGOUT_NEXT

        response.status_code = 301

    else:

        last_provider = request.COOKIES.get('astakos_last_login_method', 'local')

        provider = auth.get_provider(last_provider)

        message = provider.get_logout_success_msg

        extra = provider.get_logout_success_extra_msg

        if extra:

            message += "<br />"  + extra

        messages.success(request, message)

        response['Location'] = reverse('index')

        response.status_code = 301

    return response

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

@cookie_fix

@transaction.commit_manually

def activate(request, greeting_email_template_name='im/welcome_email.txt',

             helpdesk_email_template_name='im/helpdesk_notification.txt'):

    """

    Activates the user identified by the ``auth`` request parameter, sends a

    welcome email and renews the user token.

    The view uses commit_manually decorator in order to ensure the user state

    will be updated only if the email will be send successfully.

    """

    token = request.GET.get('auth')

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

    if request.user.is_authenticated():

        message = _(astakos_messages.LOGGED_IN_WARNING)

        messages.error(request, message)

        return HttpResponseRedirect(reverse('index'))

    try:

        user = AstakosUser.objects.get(verification_code=token)

    except AstakosUser.DoesNotExist:

        raise Http404

    if user.email_verified:

        message = _(astakos_messages.ACCOUNT_ALREADY_VERIFIED)

        messages.error(request, message)

        return HttpResponseRedirect(reverse('index'))

    try:

        backend = activation_backends.get_backend()

        result = backend.handle_verification(user, token)

        backend.send_result_notifications(result, user)

        next = settings.ACTIVATION_REDIRECT_URL or next

        response = HttpResponseRedirect(reverse('index'))

        if user.is_active:

            response = prepare_response(request, user, next, renew=True)

            messages.success(request, _(result.message))

        else:

            messages.warning(request, _(result.message))

    except Exception:

        transaction.rollback()

        raise

    else:

        transaction.commit()

        return response

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

@cookie_fix

def approval_terms(request, term_id=None,

                   template_name='im/approval_terms.html', extra_context=None):

    extra_context = extra_context or {}

    term = None

    terms = None

    if not term_id:

        try:

            term = ApprovalTerms.objects.order_by('-id')[0]

        except IndexError:

            pass

    else:

        try:

            term = ApprovalTerms.objects.get(id=term_id)

        except ApprovalTerms.DoesNotExist, e:

            pass

    if not term:

        messages.error(request, _(astakos_messages.NO_APPROVAL_TERMS))

        return HttpResponseRedirect(reverse('index'))

    try:

        f = open(term.location, 'r')

    except IOError:

        messages.error(request, _(astakos_messages.GENERIC_ERROR))

        return render_response(

            template_name, context_instance=get_context(request,

                                                        extra_context))

    terms = f.read()

    if request.method == 'POST':

        next = restrict_next(

            request.POST.get('next'),

            domain=settings.COOKIE_DOMAIN

        )

        if not next:

            next = reverse('index')

        form = SignApprovalTermsForm(request.POST, instance=request.user)

        if not form.is_valid():

            return render_response(template_name,

                                   terms=terms,

                                   approval_terms_form=form,

                                   context_instance=get_context(request,

                                                                extra_context))

        user = form.save()

        return HttpResponseRedirect(next)

    else:

        form = None

        if request.user.is_authenticated() and not request.user.signed_terms:

            form = SignApprovalTermsForm(instance=request.user)

        return render_response(template_name,

                               terms=terms,

                               approval_terms_form=form,

                               context_instance=get_context(request,

                                                            extra_context))

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

@cookie_fix

@transaction.commit_manually

def change_email(request, activation_key=None,

                 email_template_name='registration/email_change_email.txt',

                 form_template_name='registration/email_change_form.html',

                 confirm_template_name='registration/email_change_done.html',

                 extra_context=None):

    extra_context = extra_context or {}

    if not settings.EMAILCHANGE_ENABLED:

        raise PermissionDenied

    if activation_key:

        try:

            try:

                email_change = EmailChange.objects.get(

                    activation_key=activation_key)

            except EmailChange.DoesNotExist:

                transaction.rollback()

                logger.error("[change-email] Invalid or used activation "

                             "code, %s", activation_key)

                raise Http404

            if (request.user.is_authenticated() and \

                request.user == email_change.user) or not \

                    request.user.is_authenticated():

                user = EmailChange.objects.change_email(activation_key)

                msg = _(astakos_messages.EMAIL_CHANGED)

                messages.success(request, msg)

                transaction.commit()

                return HttpResponseRedirect(reverse('edit_profile'))

            else:

                logger.error("[change-email] Access from invalid user, %s %s",

                             email_change.user, request.user.log_display)

                transaction.rollback()

                raise PermissionDenied

        except ValueError, e:

            messages.error(request, e)

            transaction.rollback()

            return HttpResponseRedirect(reverse('index'))

        return render_response(confirm_template_name,

                               modified_user=user if 'user' in locals()

                               else None, context_instance=get_context(request,

                               extra_context))

    if not request.user.is_authenticated():

        path = quote(request.get_full_path())

        url = request.build_absolute_uri(reverse('index'))

        return HttpResponseRedirect(url + '?next=' + path)

    # clean up expired email changes

    if request.user.email_change_is_pending():

        change = request.user.emailchanges.get()

        if change.activation_key_expired():

            change.delete()

            transaction.commit()

            return HttpResponseRedirect(reverse('email_change'))

    form = EmailChangeForm(request.POST or None)

    if request.method == 'POST' and form.is_valid():

        try:

            ec = form.save(request, email_template_name, request)

        except Exception, e:

            transaction.rollback()

            raise

        else:

            msg = _(astakos_messages.EMAIL_CHANGE_REGISTERED)

            messages.success(request, msg)

            transaction.commit()

            return HttpResponseRedirect(reverse('edit_profile'))

    if request.user.email_change_is_pending():

        messages.warning(request, astakos_messages.PENDING_EMAIL_CHANGE_REQUEST)

    return render_response(

        form_template_name,

        form=form,

        context_instance=get_context(request, extra_context)

    )

@cookie_fix

def send_activation(request, user_id, template_name='im/login.html',

                    extra_context=None):

    if request.user.is_authenticated():

        return HttpResponseRedirect(reverse('index'))

    extra_context = extra_context or {}

    try:

        u = AstakosUser.objects.get(id=user_id)

    except AstakosUser.DoesNotExist:

        messages.error(request, _(astakos_messages.ACCOUNT_UNKNOWN))

    else:

        if u.email_verified:

            logger.warning("[resend activation] Account already verified: %s",

                           u.log_display)

            messages.error(request,

                           _(astakos_messages.ACCOUNT_ALREADY_VERIFIED))

        else:

            activation_backend = activation_backends.get_backend()

            activation_backend.send_user_verification_email(u)

            messages.success(request, astakos_messages.ACTIVATION_SENT)

    return HttpResponseRedirect(reverse('index'))

@require_http_methods(["GET"])

@cookie_fix

@valid_astakos_user_required

def resource_usage(request):

    resources_meta = presentation.RESOURCES

    current_usage = quotas.get_user_quotas(request.user)

    current_usage = json.dumps(current_usage['system'])

    resource_catalog, resource_groups = _resources_catalog(for_usage=True)

    if resource_catalog is False:

        # on fail resource_groups contains the result object

        result = resource_groups

        messages.error(request, 'Unable to retrieve system resources: %s' %

                       result.reason)

    resource_catalog = json.dumps(resource_catalog)

    resource_groups = json.dumps(resource_groups)

    resources_order = json.dumps(resources_meta.get('resources_order'))

    return render_response('im/resource_usage.html',

                           context_instance=get_context(request),

                           resource_catalog=resource_catalog,

                           resource_groups=resource_groups,

                           resources_order=resources_order,

                           current_usage=current_usage,

                           token_cookie_name=settings.COOKIE_NAME,

                           usage_update_interval=

                           settings.USAGE_UPDATE_INTERVAL)

# TODO: action only on POST and user should confirm the removal

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

@cookie_fix

@valid_astakos_user_required

def remove_auth_provider(request, pk):

    try:

        provider = request.user.auth_providers.get(pk=int(pk)).settings

    except AstakosUserAuthProvider.DoesNotExist:

        raise Http404

    if provider.get_remove_policy:

        messages.success(request, provider.get_removed_msg)

        provider.remove_from_user()

        return HttpResponseRedirect(reverse('edit_profile'))

    else:

        raise PermissionDenied

@require_http_methods(["GET"])

@required_auth_methods_assigned(allow_access=True)

@login_required

@cookie_fix

@signed_terms_required

def landing(request):

    context = {'services': Service.catalog(orderfor='dashboard')}

    return render_response(

        'im/landing.html',

        context_instance=get_context(request), **context)

def api_access(request):

    return render_response(

        'im/api_access.html',

        context_instance=get_context(request))

@cookie_fix

def get_menu(request, with_extra_links=False, with_signout=True):

    user = request.user

    index_url = reverse('index')

    if isinstance(user, User) and user.is_authenticated():

        l = []

        append = l.append

        item = MenuItem

        item.current_path = request.build_absolute_uri(request.path)

        append(item(url=request.build_absolute_uri(reverse('index')),

                    name=user.email))

        if with_extra_links:

            append(item(url=request.build_absolute_uri(reverse('landing')),

                        name="Overview"))

        if with_signout:

            append(item(url=request.build_absolute_uri(reverse('landing')),

                        name="Dashboard"))

        if with_extra_links:

            append(item(url=request.build_absolute_uri(reverse('edit_profile')),

                        name="Profile"))

        if with_extra_links:

            if settings.INVITATIONS_ENABLED:

                append(item(url=request.build_absolute_uri(reverse('invite')),

                            name="Invitations"))

            append(item(url=request.build_absolute_uri(reverse('resource_usage')),

                        name="Usage"))

            if settings.PROJECTS_VISIBLE:

                append(item(url=request.build_absolute_uri(reverse('project_list')),

                            name="Projects"))

            append(item(url=request.build_absolute_uri(reverse('feedback')),

                        name="Contact"))

        if with_signout:

            append(item(url=request.build_absolute_uri(reverse('logout')),

                        name="Sign out"))

    else:

        l = [{'url': request.build_absolute_uri(index_url),

              'name': _("Sign in")}]

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

    data = json.dumps(tuple(l))

    mimetype = 'application/json'

    if callback:

        mimetype = 'application/javascript'

        data = '%s(%s)' % (callback, data)

    return HttpResponse(content=data, mimetype=mimetype)

class MenuItem(dict):

    current_path = ''

    def __init__(self, *args, **kwargs):

        super(MenuItem, self).__init__(*args, **kwargs)

        if kwargs.get('url') or kwargs.get('submenu'):

            self.__set_is_active__()

    def __setitem__(self, key, value):

        super(MenuItem, self).__setitem__(key, value)

        if key in ('url', 'submenu'):

            self.__set_is_active__()

    def __set_is_active__(self):

        if self.get('is_active'):

            return

        if self.current_path.startswith(self.get('url')):

            self.__setitem__('is_active', True)

        else:

            submenu = self.get('submenu', ())

            current = (i for i in submenu if i.get('url') == self.current_path)

            try:

                current_node = current.next()

                if not current_node.get('is_active'):

                    current_node.__setitem__('is_active', True)

                self.__setitem__('is_active', True)

            except StopIteration:

                return

    def __setattribute__(self, name, value):

        super(MenuItem, self).__setattribute__(name, value)

        if name == 'current_path':

            self.__set_is_active__()

def get_services(request):

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

    mimetype = 'application/json'

    data = json.dumps(Service.catalog().values())

    if callback:

        # Consume session messages. When get_services is loaded from an astakos

        # page, messages should have already been consumed in the html

        # response. When get_services is loaded from another domain/service we

        # consume them here so that no stale messages to appear if user visits

        # an astakos view later on.

        # TODO: messages could be served to other services/sites in the dict

        # response of get_services and/or get_menu. Services could handle those

        # messages respectively.

        messages_list = list(messages.get_messages(request))

        mimetype = 'application/javascript'

        data = '%s(%s)' % (callback, data)

    return HttpResponse(content=data, mimetype=mimetype)