views.py 29.7 KB
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# Copyright 2014 Budapest University of Technology and Economics (BME IK)
#
# This file is part of CIRCLE Cloud.
#
# CIRCLE is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# CIRCLE is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with CIRCLE.  If not, see <http://www.gnu.org/licenses/>.

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from django.views.generic import (TemplateView, UpdateView, DeleteView,
                                  CreateView)
from django.core.urlresolvers import reverse_lazy
from django.shortcuts import render, redirect
from django.http import HttpResponse

from django_tables2 import SingleTableView

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from firewall.models import (Host, Vlan, Domain, Group, Record, BlacklistItem,
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                             Rule, VlanGroup, SwitchPort, EthernetDevice)
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from vm.models import Interface
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from .tables import (HostTable, VlanTable, SmallHostTable, DomainTable,
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                     GroupTable, RecordTable, BlacklistItemTable, RuleTable,
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                     VlanGroupTable, SmallRuleTable, SmallGroupRuleTable,
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                     SmallRecordTable, SwitchPortTable)
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from .forms import (HostForm, VlanForm, DomainForm, GroupForm, RecordForm,
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                    BlacklistItemForm, RuleForm, VlanGroupForm, SwitchPortForm)
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from django.contrib import messages
from django.views.generic.edit import FormMixin
from django.utils.translation import ugettext_lazy as _
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from braces.views import LoginRequiredMixin, SuperuserRequiredMixin
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# from django.db.models import Q
from operator import itemgetter
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from itertools import chain
import json
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from dashboard.views import AclUpdateView
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from dashboard.forms import AclUserOrGroupAddForm
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class SuccessMessageMixin(FormMixin):
    """
    Adds a success message on successful form submission.
    From django/contrib/messages/views.py@9a85ad89
    """
    success_message = ''

    def form_valid(self, form):
        response = super(SuccessMessageMixin, self).form_valid(form)
        success_message = self.get_success_message(form.cleaned_data)
        if success_message:
            messages.success(self.request, success_message)
        return response

    def get_success_message(self, cleaned_data):
        return self.success_message % cleaned_data


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class IndexView(LoginRequiredMixin, SuperuserRequiredMixin, TemplateView):
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    template_name = "network/index.html"

    def get_context_data(self, **kwargs):
        context = super(IndexView, self).get_context_data(**kwargs)

        size = 13
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        blacklists = BlacklistItem.objects.all().order_by(
            '-modified_at')[:size]
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        domains = Domain.objects.all().order_by('-modified_at')[:size]
        groups = Group.objects.all().order_by('-modified_at')[:size]
        hosts = Host.objects.all().order_by('-modified_at')[:size]
        records = Record.objects.all().order_by('-modified_at')[:size]
        vlans = Vlan.objects.all().order_by('-modified_at')[:size]
        vlangroups = VlanGroup.objects.all().order_by('-modified_at')[:size]
        rules = Rule.objects.all().order_by('-modified_at')[:size]

        result_list = []
        for i in (sorted(chain(domains, groups, hosts, records, vlans,
                               vlangroups, rules),
                         key=lambda x: x.modified_at, reverse=True)[:size]):
            result_list.append(
                {
                    'class_name': unicode(i.__class__.__name__),
                    'modified_at': i.modified_at,
                    'created_at': i.created_at,
                    'name': unicode(i),
                    'link': i.get_absolute_url()
                })

        context['latest_blacklists'] = blacklists
        context['latest'] = result_list
        return context


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class BlacklistList(LoginRequiredMixin, SuperuserRequiredMixin,
                    SingleTableView):
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    model = BlacklistItem
    table_class = BlacklistItemTable
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    template_name = "network/blacklist-list.html"
    table_pagination = False


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class BlacklistDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                      SuccessMessageMixin, UpdateView):
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    model = BlacklistItem
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    template_name = "network/blacklist-edit.html"
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    form_class = BlacklistItemForm
    success_message = _(u'Successfully modified blacklist item'
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                        '%(ipv4)s - %(type)s!')

    def get_success_url(self):
        if 'pk' in self.kwargs:
            return reverse_lazy('network.blacklist', kwargs=self.kwargs)

    def get_context_data(self, **kwargs):
        context = super(BlacklistDetail, self).get_context_data(**kwargs)
        context['blacklist_pk'] = self.object.pk
        return context


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class BlacklistCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                      SuccessMessageMixin, CreateView):
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    model = BlacklistItem
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    template_name = "network/blacklist-create.html"
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    form_class = BlacklistItemForm
    success_message = _(u'Successfully created blacklist item '
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                        '%(ipv4)s - %(type)s!')


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class BlacklistDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = BlacklistItem
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    template_name = "network/confirm/base_delete.html"

    def get_context_data(self, **kwargs):
        """ display more information about the object """
        context = super(BlacklistDelete, self).get_context_data(**kwargs)
        if 'pk' in self.kwargs:
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            to_delete = BlacklistItem.objects.get(pk=self.kwargs['pk'])
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            context['object'] = "%s - %s - %s" % (to_delete.ipv4,
                                                  to_delete.reason,
                                                  to_delete.type)
            return context

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return self.request.POST['next']
        else:
            return reverse_lazy('network.blacklist_list')


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class DomainList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
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    model = Domain
    table_class = DomainTable
    template_name = "network/domain-list.html"
    table_pagination = False


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class DomainDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                   SuccessMessageMixin, UpdateView):
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    model = Domain
    template_name = "network/domain-edit.html"
    form_class = DomainForm
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    success_message = _(u'Successfully modified domain %(name)s!')
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    def get_success_url(self):
        if 'pk' in self.kwargs:
            return reverse_lazy('network.domain', kwargs=self.kwargs)

    def get_context_data(self, *args, **kwargs):
        context = super(DomainDetail, self).get_context_data(**kwargs)
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        self.object = self.get_object()
        context['domain_pk'] = self.object.pk

        q = Record.objects.filter(
            domain=self.object,
            host__in=Host.objects.filter(
                interface__in=Interface.objects.filter(
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                    instance__destroyed_at=None)
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            )
        )
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        context['record_list'] = SmallRecordTable(q)
        return context


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class DomainCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                   SuccessMessageMixin, CreateView):
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    model = Domain
    template_name = "network/domain-create.html"
    form_class = DomainForm
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    success_message = _(u'Successfully created domain %(name)s!')
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class DomainDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = Domain
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return self.request.POST['next']
        else:
            return reverse_lazy('network.domain_list')

    def delete(self, request, *args, **kwargs):
        self.object = self.get_object()
        if unicode(self.object) != request.POST.get('confirm'):
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            messages.error(request, _(u"Object name does not match!"))
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            return self.get(request, *args, **kwargs)

        response = super(DomainDelete, self).delete(request, *args, **kwargs)
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        messages.success(request, _(u"Domain successfully deleted!"))
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        return response

    def get_context_data(self, **kwargs):
        context = super(DomainDelete, self).get_context_data(**kwargs)

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        records_from_hosts = _(u'Records from hosts')
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        deps = []
        # vlans
        vlans = Vlan.objects.filter(domain=self.object).all()
        if len(vlans) > 0:
            deps.append({
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                'name': _('Vlans'),
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                'data': vlans
            })

            # hosts
            hosts = Host.objects.filter(vlan__in=deps[0]['data'])
            if len(hosts) > 0:
                deps.append({
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                    'name': _('Hosts'),
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                    'data':  hosts
                })

                # records
                records = Record.objects.filter(
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                    host__in=deps[1]['data']
                    # Q(domain=self.object) | (host__in=deps[1]['data'])
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                )
                if len(records) > 0:
                    deps.append({
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                        'name': records_from_hosts,
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                        'data': records
                    })

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        records = Record.objects.filter(domain=self.object)
        if len(records) > 0:
            # to filter out doubles (records from hosts and domains)
            indexes = map(itemgetter('name'), deps)
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            n = indexes.index(records_from_hosts) if len(indexes) > 0 else 0
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            deps.append({
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                'name': u'Records only from the domain',
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                'data': records.exclude(pk__in=deps[n]['data']) if n > 0
                else records
            })

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        context['deps'] = deps
        context['confirmation'] = True
        return context


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class GroupList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
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    model = Group
    table_class = GroupTable
    template_name = "network/group-list.html"
    table_pagination = False


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class GroupCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                  SuccessMessageMixin, CreateView):
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    model = Group
    template_name = "network/group-create.html"
    form_class = GroupForm
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    success_message = _(u'Successfully created host group %(name)s!')
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class GroupDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                  SuccessMessageMixin, UpdateView):
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    model = Group
    template_name = "network/group-edit.html"
    form_class = GroupForm
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    success_message = _(u'Successfully modified host group %(name)s!')
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    def get_success_url(self):
        if 'pk' in self.kwargs:
            return reverse_lazy('network.group', kwargs=self.kwargs)

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    def get_context_data(self, *args, **kwargs):
        context = super(GroupDetail, self).get_context_data(**kwargs)

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        context['group_pk'] = self.object.pk

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        # records
        q = Rule.objects.filter(hostgroup=self.object)
        context['rule_list'] = SmallRuleTable(q)
        return context

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class GroupDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = Group
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return self.request.POST['next']
        else:
            return reverse_lazy('network.group_list')

    def get_context_data(self, *args, **kwargs):
        context = super(GroupDelete, self).get_context_data(**kwargs)
        context['group_pk'] = self.object.pk
        return context


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class HostList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
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    model = Host
    table_class = HostTable
    template_name = "network/host-list.html"
    table_pagination = False

    def get_context_data(self, **kwargs):
        context = super(HostList, self).get_context_data(**kwargs)
        q = Vlan.objects.all().order_by("name")
        context['vlans'] = q
        return context

    def get_table_data(self):
        vlan_id = self.request.GET.get('vlan')
        if vlan_id:
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            data = Host.objects.filter(vlan=vlan_id).select_related()
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        else:
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            data = Host.objects.select_related()
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        return data


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class HostDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                 SuccessMessageMixin, UpdateView):
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    model = Host
    template_name = "network/host-edit.html"
    form_class = HostForm
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    success_message = _(u'Successfully modified host %(hostname)s!')
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    def get(self, request, *args, **kwargs):
        if request.is_ajax():
            host = Host.objects.get(pk=kwargs['pk'])
            host = {
                'hostname': host.hostname,
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                'ipv4': str(host.ipv4),
                'ipv6': str(host.ipv6),
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                'fqdn': host.get_fqdn()
            }
            return HttpResponse(json.dumps(host),
                                content_type="application/json")
        else:
            self.object = self.get_object()
            return super(HostDetail, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        pk = self.kwargs.get('pk')
        # this is usually not None (well, with curl and whatnot it can be)
        if pk:
            groups = Host.objects.get(pk=pk).groups.all()
            groups = [i.pk for i in groups]
            # request.POST is immutable
            post_copy = request.POST.copy()
            post_copy.setlist('groups', groups)
            request.POST = post_copy
            return super(HostDetail, self).post(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super(HostDetail, self).get_context_data(**kwargs)
        # own rules
        q = Rule.objects.filter(host=self.object).all()
        context['rule_list'] = SmallRuleTable(q)

        # rules from host groups
        group_rule_list = []
        for group in self.object.groups.all():
            q = Rule.objects.filter(hostgroup=group).all()
            group_rule_list.append({
                'table': SmallGroupRuleTable(q),
                'name': unicode(group),
                'pk': group.pk
            })
        context['group_rule_list'] = group_rule_list

        # available groups
        rest = Group.objects.exclude(pk__in=self.object.groups.all()).all()
        context['not_used_groups'] = rest

        # set host pk (we need this for URL-s)
        context['host_pk'] = self.kwargs['pk']

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        from network.tables import HostRecordsTable
        context['records_table'] = HostRecordsTable(
            Record.objects.filter(host=self.get_object()),
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            request=self.request, template="django_tables2/table_no_page.html"
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        )

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        return context

    def get_success_url(self):
        if 'pk' in self.kwargs:
            return reverse_lazy('network.host', kwargs=self.kwargs)


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class HostCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                 SuccessMessageMixin, CreateView):
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    model = Host
    template_name = "network/host-create.html"
    form_class = HostForm
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    success_message = _(u'Successfully created host %(hostname)s!')
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class HostDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = Host
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return self.request.POST['next']
        else:
            return reverse_lazy('network.host_list')

    def get_context_data(self, *args, **kwargs):
        context = super(HostDelete, self).get_context_data(**kwargs)

        deps = []
        records = Record.objects.filter(host=self.object).all()
        if records:
            deps.append({
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                'name': _('Records'),
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                'data': records
            })

        context['deps'] = deps
        context['confirmation'] = True
        return context

    def delete(self, request, *args, **kwargs):
        self.object = self.get_object()
        if unicode(self.object) != request.POST.get('confirm'):
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            messages.error(request, _(u"Object name does not match!"))
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            return self.get(request, *args, **kwargs)

        response = super(HostDelete, self).delete(request, *args, **kwargs)
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        messages.success(request, _(u"Host successfully deleted!"))
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        return response


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class RecordList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
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    model = Record
    table_class = RecordTable
    template_name = "network/record-list.html"
    table_pagination = False

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    def get_context_data(self, **kwargs):
        context = super(RecordList, self).get_context_data(**kwargs)
        context['types'] = Record.CHOICES_type
        return context

    def get_table_data(self):
        type_id = self.request.GET.get('type')
        if type_id:
            data = Record.objects.filter(type=type_id).select_related()
        else:
            data = Record.objects.select_related()
        return data

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class RecordDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                   SuccessMessageMixin, UpdateView):
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    model = Record
    template_name = "network/record-edit.html"
    form_class = RecordForm
    # TODO fqdn
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    success_message = _(u'Successfully modified record!')
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    def get_context_data(self, **kwargs):
        context = super(RecordDetail, self).get_context_data(**kwargs)
        context['fqdn'] = self.object.fqdn
        context['record_pk'] = self.object.pk
        return context

    def get_success_url(self):
        if 'pk' in self.kwargs:
            return reverse_lazy('network.record', kwargs=self.kwargs)


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class RecordCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                   SuccessMessageMixin, CreateView):
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    model = Record
    template_name = "network/record-create.html"
    form_class = RecordForm
    # TODO fqdn
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    success_message = _(u'Successfully created record!')
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    def get_initial(self):
        return {
            # 'owner': 1,
            'domain': self.request.GET.get('domain'),
        }

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class RecordDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = Record
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return self.request.POST['next']
        else:
            return reverse_lazy('network.record_list')


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class RuleList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
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    model = Rule
    table_class = RuleTable
    template_name = "network/rule-list.html"
    table_pagination = False

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    def get_table_data(self):
        return Rule.objects.select_related('host', 'hostgroup', 'vlan',
                                           'vlangroup', 'firewall',
                                           'foreign_network', 'owner')

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class RuleDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                 SuccessMessageMixin, UpdateView):
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    model = Rule
    template_name = "network/rule-edit.html"
    form_class = RuleForm
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    success_message = _(u'Successfully modified rule!')
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    def get_success_url(self):
        if 'pk' in self.kwargs:
            return reverse_lazy('network.rule', kwargs=self.kwargs)

    def get_context_data(self, **kwargs):
        context = super(RuleDetail, self).get_context_data(**kwargs)

        rule = self.get_object()

        context['rule'] = rule
        return context


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class RuleCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                 SuccessMessageMixin, CreateView):
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    model = Rule
    template_name = "network/rule-create.html"
    form_class = RuleForm
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    success_message = _(u'Successfully created rule!')
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    def get_initial(self):
        return {
            # 'owner': 1,
            'host': self.request.GET.get('host'),
            'hostgroup': self.request.GET.get('hostgroup')
        }

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class RuleDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = Rule
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy('network.rule_list')


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class SwitchPortList(LoginRequiredMixin, SuperuserRequiredMixin,
                     SingleTableView):
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    model = SwitchPort
    table_class = SwitchPortTable
    template_name = "network/switch-port-list.html"
    table_pagination = False


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class SwitchPortDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                       SuccessMessageMixin, UpdateView):
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    model = SwitchPort
    template_name = "network/switch-port-edit.html"
    form_class = SwitchPortForm
    success_message = _(u'Succesfully modified switch port!')

    def get_success_url(self):
        if 'pk' in self.kwargs:
            return reverse_lazy('network.switch_port', kwargs=self.kwargs)

    def get_context_data(self, **kwargs):
        context = super(SwitchPortDetail, self).get_context_data(**kwargs)
        context['switch_port_pk'] = self.object.pk
        context['devices'] = EthernetDevice.objects.filter(
            switch_port=self.object.pk)
        return context


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class SwitchPortCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                       SuccessMessageMixin, CreateView):
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    model = SwitchPort
    template_name = "network/switch-port-create.html"
    form_class = SwitchPortForm
    success_message = _(u'Successfully created switch port!')


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class SwitchPortDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = SwitchPort
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy('network.switch_port_list')


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class VlanList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
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    model = Vlan
    table_class = VlanTable
    template_name = "network/vlan-list.html"
    table_pagination = False


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class VlanAclUpdateView(AclUpdateView):
    model = Vlan


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class VlanDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                 SuccessMessageMixin, UpdateView):
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    model = Vlan
    template_name = "network/vlan-edit.html"
    form_class = VlanForm
    slug_field = 'vid'
    slug_url_kwarg = 'vid'
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    success_message = _(u'Succesfully modified vlan %(name)s!')
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    def get_context_data(self, **kwargs):
        context = super(VlanDetail, self).get_context_data(**kwargs)
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        q = Host.objects.filter(interface__in=Interface.objects.filter(
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            vlan=self.object, instance__destroyed_at=None
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        ))

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        context['host_list'] = SmallHostTable(q)
        context['vlan_vid'] = self.kwargs.get('vid')
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        context['acl'] = AclUpdateView.get_acl_data(
            self.object, self.request.user, 'network.vlan-acl')
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        context['aclform'] = AclUserOrGroupAddForm()
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        return context

    success_url = reverse_lazy('network.vlan_list')


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class VlanCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                 SuccessMessageMixin, CreateView):
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    model = Vlan
    template_name = "network/vlan-create.html"
    form_class = VlanForm
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    success_message = _(u'Successfully created vlan %(name)s!')
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class VlanDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = Vlan
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy('network.vlan_list')

    def get_object(self, queryset=None):
        """ we identify vlans by vid and not pk """
        return Vlan.objects.get(vid=self.kwargs['vid'])

    def delete(self, request, *args, **kwargs):
        self.object = self.get_object()
        if unicode(self.object) != request.POST.get('confirm'):
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            messages.error(request, _(u"Object name does not match!"))
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            return self.get(request, *args, **kwargs)

        response = super(VlanDelete, self).delete(request, *args, **kwargs)
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        messages.success(request, _(u"Vlan successfully deleted!"))
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        return response

    def get_context_data(self, **kwargs):
        context = super(VlanDelete, self).get_context_data(**kwargs)

        deps = []
        # hosts
        hosts = Host.objects.filter(vlan=self.object).all()
        if len(hosts) > 0:
            deps.append({
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                'name': _('Hosts'),
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                'data': hosts
            })

            # records
            records = Record.objects.filter(host__in=deps[0]['data'])
            if len(records) > 0:
                deps.append({
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                    'name': _('Records'),
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                    'data':  records
                })

        context['deps'] = deps
        context['confirmation'] = True
        return context


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class VlanGroupList(LoginRequiredMixin, SuperuserRequiredMixin,
                    SingleTableView):
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    model = VlanGroup
    table_class = VlanGroupTable
    template_name = "network/vlan-group-list.html"
    table_pagination = False


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class VlanGroupDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                      SuccessMessageMixin, UpdateView):
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    model = VlanGroup
    template_name = "network/vlan-group-edit.html"
    form_class = VlanGroupForm
    success_url = reverse_lazy('network.vlan_group_list')
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    success_message = _(u'Successfully modified vlan group %(name)s!')
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    def get_context_data(self, *args, **kwargs):
        context = super(VlanGroupDetail, self).get_context_data(**kwargs)
        context['vlangroup_pk'] = self.object.pk
        return context


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class VlanGroupCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                      SuccessMessageMixin, CreateView):
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    model = VlanGroup
    template_name = "network/vlan-group-create.html"
    form_class = VlanGroupForm
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    success_message = _(u'Successfully created vlan group %(name)s!')
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class VlanGroupDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
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    model = VlanGroup
    template_name = "network/confirm/base_delete.html"

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy('network.vlan_group_list')


def remove_host_group(request, **kwargs):
    host = Host.objects.get(pk=kwargs['pk'])
    group = Group.objects.get(pk=kwargs['group_pk'])

    # for get we show the confirmation page
    if request.method == "GET":
        return render(request,
                      'network/confirm/remove_host_group.html',
                      {
                          'group': group.name,
                          'host': host.hostname
                      })

    # for post we actually remove the group from the host
    elif request.method == "POST":
        host.groups.remove(group)
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        if not request.is_ajax():
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            messages.success(request, _(u"Successfully removed %(host)s from "
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                                        "%(group)s group!" % {
                                            'host': host,
                                            'group': group
                                        }))
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        return redirect(reverse_lazy('network.host',
                                     kwargs={'pk': kwargs['pk']}))


def add_host_group(request, **kwargs):
    group_pk = request.POST.get('group')
    if request.method == "POST" and group_pk:
        host = Host.objects.get(pk=kwargs['pk'])
        group = Group.objects.get(pk=group_pk)
        host.groups.add(group)
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        if not request.is_ajax():
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            messages.success(request, _(u"Successfully added %(host)s to group"
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                                        " %(group)s!" % {
                                            'host': host,
                                            'group': group
                                        }))
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        return redirect(reverse_lazy('network.host', kwargs=kwargs))
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def remove_switch_port_device(request, **kwargs):
    device = EthernetDevice.objects.get(pk=kwargs['device_pk'])
    # for get we show the confirmation page
    if request.method == "GET":
        return render(request, 'network/confirm/base_delete.html',
                      {'object': device})

    # for post we actually remove the group from the host
    elif request.method == "POST":
        device.delete()
        if not request.is_ajax():
            messages.success(request, _(u"Successfully deleted ethernet device"
                                        " %(name)s!" % {
                                            'name': device.name,
                                        }))
        return redirect(reverse_lazy('network.switch_port',
                                     kwargs={'pk': kwargs['pk']}))


def add_switch_port_device(request, **kwargs):
    device_name = request.POST.get('device_name')

    if (request.method == "POST" and device_name and len(device_name) > 0
       and EthernetDevice.objects.filter(name=device_name).count() == 0):

        switch_port = SwitchPort.objects.get(pk=kwargs['pk'])
        new_device = EthernetDevice(name=device_name, switch_port=switch_port)
        new_device.save()
        if not request.is_ajax():
            messages.success(request, _(u"Successfully added %(name)s to this"
                                        " switch port" % {
                                            'name': device_name,
                                        }))
        return redirect(reverse_lazy('network.switch_port', kwargs=kwargs))

    elif not len(device_name) > 0:
        messages.error(request, _("Ethernet device name cannot be empty!"))
        return redirect(reverse_lazy('network.switch_port', kwargs=kwargs))
    elif EthernetDevice.objects.get(name=device_name) is not None:
        messages.error(request, _("There is already an ethernet device with"
                                  " that name!"))
        return redirect(reverse_lazy('network.switch_port', kwargs=kwargs))