Synnefo

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

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from django.http import HttpResponseBadRequest, HttpResponseRedirect

from django.shortcuts import render_to_response

from django.template import RequestContext

from django.contrib.auth import authenticate

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 AstakosUser, PendingThirdPartyUser

from astakos.im.forms import LoginForm, ExtendedPasswordChangeForm

from astakos.im.settings import RATELIMIT_RETRIES_ALLOWED

from astakos.im.settings import ENABLE_LOCAL_ACCOUNT_MIGRATION

from ratelimit.decorators import ratelimit

retries = RATELIMIT_RETRIES_ALLOWED-1

rate = str(retries)+'/m'

@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', '')

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

    if not form.is_valid():

        return render_to_response(

            on_failure,

            {'login_form':form,

             'next':next,

             'key':username},

            context_instance=RequestContext(request)

        )

    # get the user from the cash

    user = form.user_cache

    message = None

    if not user:

        message = _('Cannot authenticate account')

    elif not user.is_active:

        if not user.activation_sent:

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

        else:

            url = reverse('send_activation', kwargs={'user_id':user.id})

            message = _('You have not followed the activation link. \

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

    elif user.provider not in ('local', ''):

        message = _(

            'Local login is not the current authentication method for this account.'

        )

    if message:

        messages.error(request, message)

        return render_to_response(on_failure,

                                  {'login_form':form},

                                  context_instance=RequestContext(request))

    # hook for switching account to use third party authentication

    if ENABLE_LOCAL_ACCOUNT_MIGRATION and username:

        try:

            new = PendingThirdPartyUser.objects.get(

                username=username)

        except:

            messages.error(

                request,

                _('Account failed to switch to %(provider)s' % locals())

            )

            return render_to_response(

                on_failure,

                {'login_form':form,

                 'next':next},

                context_instance=RequestContext(request)

            )

        else:

            user.provider = new.provider

            user.third_party_identifier = new.third_party_identifier

            user.save()

            new.delete()

            messages.success(

                request,

                _('Account successfully switched to %(provider)s' % user.__dict__)

            )

    return prepare_response(request, user, next)

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

@signed_terms_required

@login_required

def password_change(request, template_name='registration/password_change_form.html',

                    post_change_redirect=None, password_change_form=ExtendedPasswordChangeForm):

    if post_change_redirect is None:

        post_change_redirect = reverse('django.contrib.auth.views.password_change_done')

    if request.method == "POST":

        form = password_change_form(

            user=request.user,

            data=request.POST,

            session_key=request.session.session_key

        )

        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))