local.py

# Copyright 2011-2012 GRNET S.A. All rights reserved.
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# without modification, are permitted provided that the following
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from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.contrib import messages
from django.utils.translation import ugettext as _
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_http_methods
from django.core.urlresolvers import reverse
from django.contrib.auth.decorators import login_required

from astakos.im.util import prepare_response, get_query
from astakos.im.views import requires_anonymous, signed_terms_required
from astakos.im.models import PendingThirdPartyUser
from astakos.im.forms import LoginForm, ExtendedPasswordChangeForm, \
                             ExtendedSetPasswordForm
from astakos.im.settings import (RATELIMIT_RETRIES_ALLOWED,
                                ENABLE_LOCAL_ACCOUNT_MIGRATION)
import astakos.im.messages as astakos_messages
from astakos.im.views import requires_auth_provider
from astakos.im import settings

from ratelimit.decorators import ratelimit

retries = RATELIMIT_RETRIES_ALLOWED - 1
rate = str(retries) + '/m'


@requires_auth_provider('local', login=True)
@require_http_methods(["GET", "POST"])
@csrf_exempt
@requires_anonymous
@ratelimit(field='username', method='POST', rate=rate)
def login(request, on_failure='im/login.html'):
    """
    on_failure: the template name to render on login failure
    """
    was_limited = getattr(request, 'limited', False)
    form = LoginForm(data=request.POST,
                     was_limited=was_limited,
                     request=request)
    next = get_query(request).get('next', '')
    third_party_token = get_query(request).get('key', False)

    if not form.is_valid():
        return render_to_response(
            on_failure,
            {'login_form':form,
             'next':next,
             'key': third_party_token},
            context_instance=RequestContext(request)
        )
    # get the user from the cash
    user = form.user_cache

    message = None
    if not user:
        message = _(astakos_messages.ACCOUNT_AUTHENTICATION_FAILED)
    elif not user.is_active:
        if not user.activation_sent:
            message = _(astakos_messages.ACCOUNT_PENDING_ACTIVATION)
        else:
			# TODO: USE astakos_messages
            url = reverse('send_activation', kwargs={'user_id':user.id})
            msg = _('You have not followed the activation link.')
            if settings.MODERATION_ENABLED:
                msg_extra = ' ' + _('Please contact support.')
            else:
                msg_extra = _('<a href="%s">Resend activation email?</a>') % url

            message = msg + msg_extra
    elif not user.can_login_with_auth_provider('local'):
        # valid user logged in with no auth providers set, add local provider
        # and let him log in
        if user.auth_providers.count() == 0:
            user.add_auth_provider('local')
        else:
            message = _(astakos_messages.NO_LOCAL_AUTH)

    if message:
        messages.error(request, message)
        return render_to_response(on_failure,
                                  {'login_form': form},
                                  context_instance=RequestContext(request))

    response = prepare_response(request, user, next)
    if third_party_token:
        # use requests to assign the account he just authenticated with with
        # a third party provider account
        # TODO: USE astakos_messages
        try:
          request.user.add_pending_auth_provider(third_party_token)
          messages.success(request, _('Your new login method has been added'))
        except PendingThirdPartyUser.DoesNotExist:
          messages.error(request, _('Account method assignment failed'))

    return response

@require_http_methods(["GET", "POST"])
@signed_terms_required
@login_required
@requires_auth_provider('local', login=True)
def password_change(request, template_name='registration/password_change_form.html',
                    post_change_redirect=None, password_change_form=ExtendedPasswordChangeForm):

    create_password = False

    # no local backend user wants to create a password
    if not request.user.has_auth_provider('local'):
        create_password = True
        password_change_form = ExtendedSetPasswordForm

    if post_change_redirect is None:
        post_change_redirect = reverse('edit_profile')

    if request.method == "POST":
        form_kwargs = dict(
            user=request.user,
            data=request.POST,
        )
        if not create_password:
            form_kwargs['session_key'] = session_key=request.session.session_key

        form = password_change_form(**form_kwargs)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(post_change_redirect)
    else:
        form = password_change_form(user=request.user)
    return render_to_response(template_name, {
        'form': form,
    }, context_instance=RequestContext(request))