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

#      copyright notice, this list of conditions and the following

#      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

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import logging

import calendar

import inflect

engine = inflect.engine()

from urllib import quote

from functools import wraps

from datetime import datetime

from django_tables2 import RequestConfig

from django.shortcuts import get_object_or_404

from django.contrib import messages

from django.contrib.auth.decorators import login_required

from django.core.urlresolvers import reverse

from django.db import transaction

from django.db.utils import IntegrityError

from django.http import (

    HttpResponse, HttpResponseBadRequest,

    HttpResponseForbidden, HttpResponseRedirect,

    HttpResponseBadRequest, Http404)

from django.shortcuts import redirect

from django.template import RequestContext, loader as template_loader

from django.utils.http import urlencode

from django.utils.safestring import mark_safe

from django.utils.translation import ugettext as _

from django.views.generic.create_update import (

    apply_extra_context, lookup_object, delete_object, get_model_and_form_class)

from django.views.generic.list_detail import object_list, object_detail

from django.core.xheaders import populate_xheaders

from django.core.exceptions import ValidationError, PermissionDenied

from django.template.loader import render_to_string

from django.views.decorators.http import require_http_methods

from django.db.models import Q

from django.core.exceptions import PermissionDenied

from django.utils import simplejson as json

import astakos.im.messages as astakos_messages

from astakos.im.activation_backends import get_backend, SimpleBackend

from astakos.im import tables

from astakos.im.models import (

    AstakosUser, ApprovalTerms,

    EmailChange, RESOURCE_SEPARATOR,

    AstakosUserAuthProvider, PendingThirdPartyUser,

    ProjectApplication, ProjectMembership, Project)

from astakos.im.util import (

    get_context, prepare_response, get_query, restrict_next)

from astakos.im.forms import (

    LoginForm, InvitationForm,

    FeedbackForm, SignApprovalTermsForm,

    EmailChangeForm,

    ProjectApplicationForm, ProjectSortForm,

    AddProjectMembersForm, ProjectSearchForm,

    ProjectMembersSortForm)

from astakos.im.forms import ExtendedProfileForm as ProfileForm

from astakos.im.functions import (

    send_feedback, SendMailError,

    logout as auth_logout,

    activate as activate_func,

    invite,

    send_activation as send_activation_func,

    SendNotificationError,

    accept_membership, reject_membership, remove_membership,

    leave_project, join_project, enroll_member)

from astakos.im.settings import (

    COOKIE_DOMAIN, LOGOUT_NEXT,

    LOGGING_LEVEL, PAGINATE_BY,

    RESOURCES_PRESENTATION_DATA, PAGINATE_BY_ALL,

    ACTIVATION_REDIRECT_URL,

    MODERATION_ENABLED)

from astakos.im.api import get_services_dict

from astakos.im import settings as astakos_settings

from astakos.im.api.callpoint import AstakosCallpoint

from astakos.im import auth_providers

logger = logging.getLogger(__name__)

callpoint = AstakosCallpoint()

def render_response(template, tab=None, status=200, context_instance=None, **kwargs):

    """

    Calls ``django.template.loader.render_to_string`` with an additional ``tab``

    keyword argument and returns an ``django.http.HttpResponse`` with the

    specified ``status``.

    """

    if tab is None:

        tab = template.partition('_')[0].partition('.html')[0]

    kwargs.setdefault('tab', tab)

    html = template_loader.render_to_string(

        template, kwargs, context_instance=context_instance)

    response = HttpResponse(html, status=status)

    return response

def requires_auth_provider(provider_id, **perms):

    """

    """

    def decorator(func, *args, **kwargs):

        @wraps(func)

        def wrapper(request, *args, **kwargs):

            provider = auth_providers.get_provider(provider_id)

            if not provider or not provider.is_active():

                raise PermissionDenied

            if provider:

                for pkey, value in perms.iteritems():

                    attr = 'is_available_for_%s' % pkey.lower()

                    if getattr(provider, attr)() != value:

                        #TODO: add session message

                        return HttpResponseRedirect(reverse('login'))

            return func(request, *args)

        return wrapper

    return decorator

def requires_anonymous(func):

    """

    Decorator checkes whether the request.user is not Anonymous and in that case

    redirects to `logout`.

    """

    @wraps(func)

    def wrapper(request, *args):

        if not request.user.is_anonymous():

            next = urlencode({'next': request.build_absolute_uri()})

            logout_uri = reverse(logout) + '?' + next

            return HttpResponseRedirect(logout_uri)

        return func(request, *args)

    return wrapper

def signed_terms_required(func):

    """

    Decorator checks whether the request.user is Anonymous and in that case

    redirects to `logout`.

    """

    @wraps(func)

    def wrapper(request, *args, **kwargs):

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

            params = urlencode({'next': request.build_absolute_uri(),

                                'show_form': ''})

            terms_uri = reverse('latest_terms') + '?' + params

            return HttpResponseRedirect(terms_uri)

        return func(request, *args, **kwargs)

    return wrapper

def required_auth_methods_assigned(only_warn=False):

    """

    Decorator that checks whether the request.user has all required auth providers

    assigned.

    """

    required_providers = auth_providers.REQUIRED_PROVIDERS.keys()

    def decorator(func):

        if not required_providers:

            return func

        @wraps(func)

        def wrapper(request, *args, **kwargs):

            if request.user.is_authenticated():

                for required in required_providers:

                    if not request.user.has_auth_provider(required):

                        provider = auth_providers.get_provider(required)

                        if only_warn:

                            messages.error(request,

                                           _(astakos_messages.AUTH_PROVIDER_REQUIRED  % {

                                               'provider': provider.get_title_display}))

                        else:

                            return HttpResponseRedirect(reverse('edit_profile'))

            return func(request, *args, **kwargs)

        return wrapper

    return decorator

def valid_astakos_user_required(func):

    return signed_terms_required(required_auth_methods_assigned()(login_required(func)))

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

@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"])

@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"])

@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(inviter, email, realname)

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

                    messages.success(request, message)

                except SendMailError, e:

                    message = e.message

                    messages.error(request, message)

                    transaction.rollback()

                except BaseException, e:

                    message = _(astakos_messages.GENERIC_ERROR)

                    messages.error(request, message)

                    logger.exception(e)

                    transaction.rollback()

                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(only_warn=True)

@login_required

@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=COOKIE_DOMAIN

                )

                msg = _(astakos_messages.PROFILE_UPDATED)

                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_active_auth_providers()

    # providers that user can add

    user_available_providers = request.user.get_available_auth_providers()

    extra_context['services'] = get_services_dict()

    return render_response(template_name,

                           profile_form = form,

                           user_providers = user_providers,

                           user_available_providers = user_available_providers,

                           context_instance = get_context(request,

                                                          extra_context))

@transaction.commit_manually

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

def signup(request, template_name='im/signup.html', on_success='index', extra_context=None, 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 ``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():

        return HttpResponseRedirect(reverse('edit_profile'))

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

    if not auth_providers.get_provider(provider).is_available_for_create():

        raise PermissionDenied

    id = get_query(request).get('id')

    try:

        instance = AstakosUser.objects.get(id=id) if id else None

    except AstakosUser.DoesNotExist:

        instance = None

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

    if third_party_token:

        pending = get_object_or_404(PendingThirdPartyUser,

                                    token=third_party_token)

        provider = pending.provider

        instance = pending.get_user_instance()

    try:

        if not backend:

            backend = get_backend(request)

        form = backend.get_signup_form(provider, instance)

    except Exception, e:

        form = SimpleBackend(request).get_signup_form(provider)

        messages.error(request, e)

    if request.method == 'POST':

        if form.is_valid():

            user = form.save(commit=False)

            # delete previously unverified accounts

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

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

            try:

                result = backend.handle_activation(user)

                status = messages.SUCCESS

                message = result.message

                form.store_user(user, request)

                if 'additional_email' in form.cleaned_data:

                    additional_email = form.cleaned_data['additional_email']

                    if additional_email != user.email:

                        user.additionalmail_set.create(email=additional_email)

                        msg = 'Additional email: %s saved for user %s.' % (

                            additional_email,

                            user.email

                        )

                        logger._log(LOGGING_LEVEL, msg, [])

                if user and user.is_active:

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

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

                    transaction.commit()

                    return response

                transaction.commit()

                messages.add_message(request, status, message)

                return HttpResponseRedirect(reverse(on_success))

            except SendMailError, e:

                logger.exception(e)

                status = messages.ERROR

                message = e.message

                messages.error(request, message)

                transaction.rollback()

            except BaseException, e:

                logger.exception(e)

                message = _(astakos_messages.GENERIC_ERROR)

                messages.error(request, message)

                logger.exception(e)

                transaction.rollback()

    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(only_warn=True)

@login_required

@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']

            try:

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

            except SendMailError, e:

                messages.error(request, message)

            else:

                message = _(astakos_messages.FEEDBACK_SENT)

                messages.success(request, message)

    return render_response(template_name,

                           feedback_form=form,

                           context_instance=get_context(request, extra_context))

@require_http_methods(["GET"])

@signed_terms_required

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=COOKIE_DOMAIN

    )

    if next:

        response['Location'] = next

        response.status_code = 302

    elif LOGOUT_NEXT:

        response['Location'] = LOGOUT_NEXT

        response.status_code = 301

    else:

        message = _(astakos_messages.LOGOUT_SUCCESS)

        last_provider = request.COOKIES.get('astakos_last_login_method', None)

        if last_provider:

            provider = auth_providers.get_provider(last_provider)

            extra_message = provider.get_logout_message_display

            if extra_message:

                message += '<br />' + extra_message

        messages.add_message(request, messages.SUCCESS, mark_safe(message))

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

        response.status_code = 301

    return response

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

@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')

    try:

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

    except AstakosUser.DoesNotExist:

        return HttpResponseBadRequest(_(astakos_messages.ACCOUNT_UNKNOWN))

    if user.is_active:

        message = _(astakos_messages.ACCOUNT_ALREADY_ACTIVE)

        messages.error(request, message)

        return index(request)

    try:

        activate_func(user, greeting_email_template_name,

                      helpdesk_email_template_name, verify_email=True)

        next = ACTIVATION_REDIRECT_URL or next

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

        transaction.commit()

        return response

    except SendMailError, e:

        message = e.message

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

        transaction.rollback()

        return index(request)

    except BaseException, e:

        status = messages.ERROR

        message = _(astakos_messages.GENERIC_ERROR)

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

        logger.exception(e)

        transaction.rollback()

        return index(request)

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

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'))

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

    terms = f.read()

    if request.method == 'POST':

        next = restrict_next(

            request.POST.get('next'),

            domain=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"])

@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 astakos_settings.EMAILCHANGE_ENABLED:

        raise PermissionDenied

    if activation_key:

        try:

            user = EmailChange.objects.change_email(activation_key)

            if request.user.is_authenticated() and request.user == user or not \

                    request.user.is_authenticated():

                msg = _(astakos_messages.EMAIL_CHANGED)

                messages.success(request, msg)

                transaction.commit()

                return HttpResponseRedirect(reverse('edit_profile'))

        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(email_template_name, request)

        except SendMailError, e:

            msg = e

            messages.error(request, msg)

            transaction.rollback()

            return HttpResponseRedirect(reverse('edit_profile'))

        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)

    )

def send_activation(request, user_id, template_name='im/login.html', extra_context=None):

    if request.user.is_authenticated():

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

        return HttpResponseRedirect(reverse('edit_profile'))

    if astakos_settings.MODERATION_ENABLED:

        raise PermissionDenied

    extra_context = extra_context or {}

    try:

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

    except AstakosUser.DoesNotExist:

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

    else:

        try:

            send_activation_func(u)

            msg = _(astakos_messages.ACTIVATION_SENT)

            messages.success(request, msg)

        except SendMailError, e:

            messages.error(request, e)

    return render_response(

        template_name,

        login_form = LoginForm(request=request),

        context_instance = get_context(

            request,

            extra_context

        )

    )

@require_http_methods(["GET"])

@valid_astakos_user_required

def resource_usage(request):

    def with_class(entry):

         entry['load_class'] = 'red'

         max_value = float(entry['maxValue'])

         curr_value = float(entry['currValue'])

         entry['ratio_limited']= 0

         if max_value > 0 :

             entry['ratio'] = (curr_value / max_value) * 100

         else:

             entry['ratio'] = 0

         if entry['ratio'] < 66:

             entry['load_class'] = 'yellow'

         if entry['ratio'] < 33:

             entry['load_class'] = 'green'

         if entry['ratio']<0:

             entry['ratio'] = 0

         if entry['ratio']>100:

             entry['ratio_limited'] = 100

         else:

             entry['ratio_limited'] = entry['ratio']

         return entry

    def pluralize(entry):

        entry['plural'] = engine.plural(entry.get('name'))

        return entry

    resource_usage = None

    result = callpoint.get_user_usage(request.user.id)

    if result.is_success:

        resource_usage = result.data

        backenddata = map(with_class, result.data)

        backenddata = map(pluralize , backenddata)

    else:

        messages.error(request, result.reason)

        backenddata = []

        resource_usage = []

    if request.REQUEST.get('json', None):

        return HttpResponse(json.dumps(backenddata),

                            mimetype="application/json")

    return render_response('im/resource_usage.html',

                           context_instance=get_context(request),

                           resource_usage=backenddata,

                           usage_update_interval=astakos_settings.USAGE_UPDATE_INTERVAL,

                           result=result)

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

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

@login_required

@signed_terms_required

def remove_auth_provider(request, pk):

    try:

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

    except AstakosUserAuthProvider.DoesNotExist:

        raise Http404

    if provider.can_remove():

        provider.delete()

        return HttpResponseRedirect(reverse('edit_profile'))

    else:

        raise PermissionDenied

def how_it_works(request):

    return render_response(

        'im/how_it_works.html',

        context_instance=get_context(request))

@transaction.commit_manually

def _create_object(request, model=None, template_name=None,

        template_loader=template_loader, extra_context=None, post_save_redirect=None,

        login_required=False, context_processors=None, form_class=None,

        msg=None):

    """

    Based of django.views.generic.create_update.create_object which displays a

    summary page before creating the object.

    """

    rollback = False

    response = None

    if extra_context is None: extra_context = {}

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

        return redirect_to_login(request.path)

    try:

        model, form_class = get_model_and_form_class(model, form_class)

        extra_context['edit'] = 0

        if request.method == 'POST':

            form = form_class(request.POST, request.FILES)

            if form.is_valid():

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

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

                if verify == '1':

                    extra_context['show_form'] = False

                    extra_context['form_data'] = form.cleaned_data

                elif edit == '1':

                    extra_context['show_form'] = True

                else:

                    new_object = form.save()

                    if not msg:

                        msg = _("The %(verbose_name)s was created successfully.")

                    msg = msg % model._meta.__dict__

                    messages.success(request, msg, fail_silently=True)

                    response = redirect(post_save_redirect, new_object)

        else:

            form = form_class()

    except BaseException, e:

        logger.exception(e)

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

        rollback = True

    finally:

        if rollback:

            transaction.rollback()

        else:

            transaction.commit()

        if response == None:

            # Create the template, context, response

            if not template_name:

                template_name = "%s/%s_form.html" %\

                     (model._meta.app_label, model._meta.object_name.lower())

            t = template_loader.get_template(template_name)

            c = RequestContext(request, {

                'form': form

            }, context_processors)

            apply_extra_context(extra_context, c)

            response = HttpResponse(t.render(c))

        return response

@transaction.commit_manually

def _update_object(request, model=None, object_id=None, slug=None,

        slug_field='slug', template_name=None, template_loader=template_loader,

        extra_context=None, post_save_redirect=None, login_required=False,

        context_processors=None, template_object_name='object',

        form_class=None, msg=None):

    """

    Based of django.views.generic.create_update.update_object which displays a

    summary page before updating the object.

    """

    rollback = False

    response = None

    if extra_context is None: extra_context = {}

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

        return redirect_to_login(request.path)

    try:

        model, form_class = get_model_and_form_class(model, form_class)

        obj = lookup_object(model, object_id, slug, slug_field)

        if request.method == 'POST':

            form = form_class(request.POST, request.FILES, instance=obj)

            if form.is_valid():

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

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

                if verify == '1':

                    extra_context['show_form'] = False

                    extra_context['form_data'] = form.cleaned_data

                elif edit == '1':

                    extra_context['show_form'] = True

                else:

                    obj = form.save()

                    if not msg:

                        msg = _("The %(verbose_name)s was created successfully.")

                    msg = msg % model._meta.__dict__

                    messages.success(request, msg, fail_silently=True)

                    response = redirect(post_save_redirect, obj)

        else:

            form = form_class(instance=obj)

    except BaseException, e:

        logger.exception(e)

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

        rollback = True

    finally:

        if rollback:

            transaction.rollback()

        else:

            transaction.commit()

        if response == None:

            if not template_name:

                template_name = "%s/%s_form.html" %\

                    (model._meta.app_label, model._meta.object_name.lower())

            t = template_loader.get_template(template_name)

            c = RequestContext(request, {

                'form': form,

                template_object_name: obj,

            }, context_processors)

            apply_extra_context(extra_context, c)

            response = HttpResponse(t.render(c))

            populate_xheaders(request, response, model, getattr(obj, obj._meta.pk.attname))

        return response

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

@signed_terms_required

@login_required

def project_add(request):

    resource_groups = RESOURCES_PRESENTATION_DATA.get('groups', {})

    resource_catalog = ()

    result = callpoint.list_resources()

    details_fields = [

        "name", "homepage", "description","start_date","end_date", "comments"]

    membership_fields =[

        "member_join_policy", "member_leave_policy", "limit_on_members_number"]

    if not result.is_success:

        messages.error(

            request,

            'Unable to retrieve system resources: %s' % result.reason

    )

    else:

        resource_catalog = [

            (g, filter(lambda r: r.get('group', '') == g, result.data)) \

                for g in resource_groups]

    extra_context = {

        'resource_catalog':resource_catalog,

        'resource_groups':resource_groups,

        'show_form':True,

        'details_fields':details_fields,

        'membership_fields':membership_fields}

    return _create_object(

        request,

        template_name='im/projects/projectapplication_form.html',

        extra_context=extra_context,

        post_save_redirect=reverse('project_list'),

        form_class=ProjectApplicationForm,

        msg=_("The %(verbose_name)s has been received and \

                 is under consideration."))

@require_http_methods(["GET"])

@signed_terms_required

@login_required

def project_list(request):

    projects = ProjectApplication.objects.user_accessible_projects(request.user).select_related()

    table = tables.UserProjectApplicationsTable(projects, user=request.user,

                                                prefix="my_projects_")

    RequestConfig(request, paginate={"per_page": PAGINATE_BY}).configure(table)

    return object_list(

        request,

        projects,

        template_name='im/projects/project_list.html',

        extra_context={

            'is_search':False,

            'table': table,

        })

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

@signed_terms_required

@login_required

def project_update(request, application_id):

    resource_groups = RESOURCES_PRESENTATION_DATA.get('groups', {})

    resource_catalog = ()

    result = callpoint.list_resources()

    details_fields = [

        "name", "homepage", "description","start_date","end_date", "comments"]

    membership_fields =[

        "member_join_policy", "member_leave_policy", "limit_on_members_number"]

    if not result.is_success:

        messages.error(

            request,

            'Unable to retrieve system resources: %s' % result.reason