views.py 103 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 __future__ import unicode_literals, absolute_import
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from itertools import chain
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from os import getenv
import json
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import logging
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import re
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import requests
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from django.conf import settings
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from django.contrib.auth.models import User, Group
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from django.contrib.auth.views import login, redirect_to_login
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from django.contrib.messages import warning
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from django.contrib.messages.views import SuccessMessageMixin
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from django.core.exceptions import (
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    PermissionDenied, SuspiciousOperation,
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)
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from django.core import signing
from django.core.urlresolvers import reverse, reverse_lazy
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from django.db.models import Count
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from django.http import HttpResponse, HttpResponseRedirect, Http404
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from django.shortcuts import redirect, render, get_object_or_404
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from django.views.decorators.http import require_GET, require_POST
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from django.views.generic.detail import SingleObjectMixin
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from django.views.generic import (TemplateView, DetailView, View, DeleteView,
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                                  UpdateView, CreateView, ListView)
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from django.contrib import messages
from django.utils.translation import ugettext as _
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from django.utils.translation import ungettext as __
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from django.template.loader import render_to_string
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from django.template import RequestContext
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from django.forms.models import inlineformset_factory
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from django_tables2 import SingleTableView
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from braces.views import (LoginRequiredMixin, SuperuserRequiredMixin,
                          PermissionRequiredMixin)
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from braces.views._access import AccessMixin
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from .forms import (
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    CircleAuthenticationForm, HostForm, LeaseForm, MyProfileForm,
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    NodeForm, TemplateForm, TraitForm, VmCustomizeForm, GroupCreateForm,
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    UserCreationForm, GroupProfileUpdateForm, UnsubscribeForm,
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    VmSaveForm,
    CirclePasswordChangeForm, VmCreateDiskForm, VmDownloadDiskForm,
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)
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from .tables import (
    NodeListTable, NodeVmListTable, TemplateListTable, LeaseListTable,
    GroupListTable,
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)
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from vm.models import (
    Instance, instance_activity, InstanceActivity, InstanceTemplate, Interface,
    InterfaceTemplate, Lease, Node, NodeActivity, Trait,
)
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from storage.models import Disk
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from firewall.models import Vlan, Host, Rule
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from .models import Favourite, Profile, GroupProfile
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logger = logging.getLogger(__name__)
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saml_available = hasattr(settings, "SAML_CONFIG")
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def search_user(keyword):
    try:
        return User.objects.get(username=keyword)
    except User.DoesNotExist:
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        try:
            return User.objects.get(profile__org_id=keyword)
        except User.DoesNotExist:
            return User.objects.get(email=keyword)
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class GroupCodeMixin(object):

    @classmethod
    def get_available_group_codes(cls, request):
        newgroups = []
        if saml_available:
            from djangosaml2.cache import StateCache, IdentityCache
            from djangosaml2.conf import get_config
            from djangosaml2.views import _get_subject_id
            from saml2.client import Saml2Client

            state = StateCache(request.session)
            conf = get_config(None, request)
            client = Saml2Client(conf, state_cache=state,
                                 identity_cache=IdentityCache(request.session),
                                 logger=logger)
            subject_id = _get_subject_id(request.session)
            identity = client.users.get_identity(subject_id,
                                                 check_not_on_or_after=False)
            if identity:
                attributes = identity[0]
                owneratrs = getattr(
                    settings, 'SAML_GROUP_OWNER_ATTRIBUTES', [])
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                for group in chain(*[attributes[i]
                                     for i in owneratrs if i in attributes]):
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                    try:
                        GroupProfile.search(group)
                    except Group.DoesNotExist:
                        newgroups.append(group)

        return newgroups


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class FilterMixin(object):
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    def get_queryset_filters(self):
        filters = {}
        for item in self.allowed_filters:
            if item in self.request.GET:
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                filters[self.allowed_filters[item]] = (
                    self.request.GET[item].split(",")
                    if self.allowed_filters[item].endswith("__in") else
                    self.request.GET[item])

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        return filters
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    def get_queryset(self):
        return super(FilterMixin,
                     self).get_queryset().filter(**self.get_queryset_filters())
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class IndexView(LoginRequiredMixin, TemplateView):
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    template_name = "dashboard/index.html"
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    def get_context_data(self, **kwargs):
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        user = self.request.user
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        context = super(IndexView, self).get_context_data(**kwargs)
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        # instances
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        favs = Instance.objects.filter(favourite__user=self.request.user)
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        instances = Instance.get_objects_with_level(
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            'user', user, disregard_superuser=True).filter(destroyed_at=None)
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        display = list(favs) + list(set(instances) - set(favs))
        for d in display:
            d.fav = True if d in favs else False
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        context.update({
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            'instances': display[:5],
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            'more_instances': instances.count() - len(instances[:5])
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        })

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        running = instances.filter(status='RUNNING')
        stopped = instances.exclude(status__in=('RUNNING', 'NOSTATE'))
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        context.update({
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            'running_vms': running[:20],
            'running_vm_num': running.count(),
            'stopped_vm_num': stopped.count()
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        })
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        # nodes
        if user.is_superuser:
            nodes = Node.objects.all()
            context.update({
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                'nodes': nodes[:5],
                'more_nodes': nodes.count() - len(nodes[:5]),
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                'sum_node_num': nodes.count(),
                'node_num': {
                    'running': Node.get_state_count(True, True),
                    'missing': Node.get_state_count(False, True),
                    'disabled': Node.get_state_count(True, False),
                    'offline': Node.get_state_count(False, False)
                }
            })

        # groups
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        if user.has_module_perms('auth'):
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            profiles = GroupProfile.get_objects_with_level('operator', user)
            groups = Group.objects.filter(groupprofile__in=profiles)
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            context.update({
                'groups': groups[:5],
                'more_groups': groups.count() - len(groups[:5]),
            })
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        # template
        if user.has_perm('vm.create_template'):
            context['templates'] = InstanceTemplate.get_objects_with_level(
                'operator', user).all()[:5]

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        return context

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def get_vm_acl_data(obj):
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    levels = obj.ACL_LEVELS
    users = obj.get_users_with_level()
    users = [{'user': u, 'level': l} for u, l in users]
    groups = obj.get_groups_with_level()
    groups = [{'group': g, 'level': l} for g, l in groups]
    return {'users': users, 'groups': groups, 'levels': levels,
            'url': reverse('dashboard.views.vm-acl', args=[obj.pk])}


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def get_group_acl_data(obj):
    aclobj = obj.profile
    levels = aclobj.ACL_LEVELS
    users = aclobj.get_users_with_level()
    users = [{'user': u, 'level': l} for u, l in users]
    groups = aclobj.get_groups_with_level()
    groups = [{'group': g, 'level': l} for g, l in groups]
    return {'users': users, 'groups': groups, 'levels': levels,
            'url': reverse('dashboard.views.group-acl', args=[obj.pk])}


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class CheckedDetailView(LoginRequiredMixin, DetailView):
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    read_level = 'user'

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    def get_has_level(self):
        return self.object.has_level

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    def get_context_data(self, **kwargs):
        context = super(CheckedDetailView, self).get_context_data(**kwargs)
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        if not self.get_has_level()(self.request.user, self.read_level):
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            raise PermissionDenied()
        return context


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class VmDetailVncTokenView(CheckedDetailView):
    template_name = "dashboard/vm-detail.html"
    model = Instance

    def get(self, request, **kwargs):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'operator'):
            raise PermissionDenied()
        if self.object.node:
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            with instance_activity(code_suffix='console-accessed',
                                   instance=self.object, user=request.user,
                                   concurrency_check=False):
                port = self.object.vnc_port
                host = str(self.object.node.host.ipv4)
                value = signing.dumps({'host': host, 'port': port},
                                      key=getenv("PROXY_SECRET", 'asdasd')),
                return HttpResponse('vnc/?d=%s' % value)
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        else:
            raise Http404()


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class VmDetailView(CheckedDetailView):
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    template_name = "dashboard/vm-detail.html"
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    model = Instance
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    def get_context_data(self, **kwargs):
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        context = super(VmDetailView, self).get_context_data(**kwargs)
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        instance = context['instance']
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        ops = get_operations(instance, self.request.user)
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        context.update({
            'graphite_enabled': VmGraphView.get_graphite_url() is not None,
            'vnc_url': reverse_lazy("dashboard.views.detail-vnc",
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                                    kwargs={'pk': self.object.pk}),
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            'ops': ops,
            'op': {i.op: i for i in ops},
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        })
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        # activity data
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        context['activities'] = self.object.get_activities(self.request.user)
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        context['vlans'] = Vlan.get_objects_with_level(
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            'user', self.request.user
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        ).exclude(  # exclude already added interfaces
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            pk__in=Interface.objects.filter(
                instance=self.get_object()).values_list("vlan", flat=True)
        ).all()
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        context['acl'] = get_vm_acl_data(instance)
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        context['os_type_icon'] = instance.os_type.replace("unknown",
                                                           "question")
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        # ipv6 infos
        context['ipv6_host'] = instance.get_connect_host(use_ipv6=True)
        context['ipv6_port'] = instance.get_connect_port(use_ipv6=True)
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        return context
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    def post(self, request, *args, **kwargs):
        if (request.POST.get('ram-size') and request.POST.get('cpu-count')
                and request.POST.get('cpu-priority')):
            return self.__set_resources(request)

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        options = {
            'change_password': self.__change_password,
            'new_name': self.__set_name,
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            'new_description': self.__set_description,
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            'new_tag': self.__add_tag,
            'to_remove': self.__remove_tag,
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            'port': self.__add_port,
            'new_network_vlan': self.__new_network,
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            'abort_operation': self.__abort_operation,
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        }
        for k, v in options.iteritems():
            if request.POST.get(k) is not None:
                return v(request)
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    def __change_password(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()
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        self.object.change_password(user=request.user)
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        messages.success(request, _("Password changed."))
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        if request.is_ajax():
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            return HttpResponse("Success.")
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        else:
            return redirect(reverse_lazy("dashboard.views.detail",
                                         kwargs={'pk': self.object.pk}))
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    def __set_resources(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()
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        if not request.user.has_perm('vm.change_resources'):
            raise PermissionDenied()
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        resources = {
            'num_cores': request.POST.get('cpu-count'),
            'ram_size': request.POST.get('ram-size'),
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            'max_ram_size': request.POST.get('ram-size'),  # TODO: max_ram
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            'priority': request.POST.get('cpu-priority')
        }
        Instance.objects.filter(pk=self.object.pk).update(**resources)

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        success_message = _("Resources successfully updated.")
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        if request.is_ajax():
            response = {'message': success_message}
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(reverse_lazy("dashboard.views.detail",
                                         kwargs={'pk': self.object.pk}))

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    def __set_name(self, request):
        self.object = self.get_object()
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        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()
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        new_name = request.POST.get("new_name")
        Instance.objects.filter(pk=self.object.pk).update(
            **{'name': new_name})

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        success_message = _("VM successfully renamed.")
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        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
                'vm_pk': self.object.pk
            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
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            return redirect(self.object.get_absolute_url())

    def __set_description(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        new_description = request.POST.get("new_description")
        Instance.objects.filter(pk=self.object.pk).update(
            **{'description': new_description})

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        success_message = _("VM description successfully updated.")
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        if request.is_ajax():
            response = {
                'message': success_message,
                'new_description': new_description,
            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(self.object.get_absolute_url())
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    def __add_tag(self, request):
        new_tag = request.POST.get('new_tag')
        self.object = self.get_object()
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        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()
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        if len(new_tag) < 1:
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            message = u"Please input something."
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        elif len(new_tag) > 20:
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            message = u"Tag name is too long."
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        else:
            self.object.tags.add(new_tag)

        try:
            messages.error(request, message)
        except:
            pass

        return redirect(reverse_lazy("dashboard.views.detail",
                                     kwargs={'pk': self.object.pk}))

    def __remove_tag(self, request):
        try:
            to_remove = request.POST.get('to_remove')
            self.object = self.get_object()
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            if not self.object.has_level(request.user, 'owner'):
                raise PermissionDenied()
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            self.object.tags.remove(to_remove)
            message = u"Success"
        except:  # note this won't really happen
            message = u"Not success"

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': message}),
                content_type="application=json"
            )
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        else:
            return redirect(reverse_lazy("dashboard.views.detail",
                            kwargs={'pk': self.object.pk}))
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    def __add_port(self, request):
        object = self.get_object()
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        if (not object.has_level(request.user, 'owner') or
                not request.user.has_perm('vm.config_ports')):
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            raise PermissionDenied()
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        port = request.POST.get("port")
        proto = request.POST.get("proto")

        try:
            error = None
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            interfaces = object.interface_set.all()
            host = Host.objects.get(pk=request.POST.get("host_pk"),
                                    interface__in=interfaces)
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            host.add_port(proto, private=port)
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        except Host.DoesNotExist:
            logger.error('Tried to add port to nonexistent host %d. User: %s. '
                         'Instance: %s', request.POST.get("host_pk"),
                         unicode(request.user), object)
            raise PermissionDenied()
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        except ValueError:
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            error = _("There is a problem with your input.")
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        except Exception as e:
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            error = _("Unknown error.")
            logger.error(e)
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        if request.is_ajax():
            pass
        else:
            if error:
                messages.error(request, error)
            return redirect(reverse_lazy("dashboard.views.detail",
                                         kwargs={'pk': self.get_object().pk}))

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    def __new_network(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()

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        vlan = get_object_or_404(Vlan, pk=request.POST.get("new_network_vlan"))
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        if not vlan.has_level(request.user, 'user'):
            raise PermissionDenied()
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        try:
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            self.object.add_interface(vlan=vlan, user=request.user)
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            messages.success(request, _("Successfully added new interface."))
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        except Exception, e:
            error = u' '.join(e.messages)
            messages.error(request, error)

        return redirect("%s#network" % reverse_lazy(
            "dashboard.views.detail", kwargs={'pk': self.object.pk}))

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    def __abort_operation(self, request):
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        self.object = self.get_object()

        activity = get_object_or_404(InstanceActivity,
                                     pk=request.POST.get("activity"))
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        if not activity.is_abortable_for(request.user):
            raise PermissionDenied()
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        activity.abort()
        return redirect("%s#activity" % self.object.get_absolute_url())

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class OperationView(DetailView):
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    template_name = 'dashboard/operate.html'
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    show_in_toolbar = True
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    @property
    def name(self):
        return self.get_op().name
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    @property
    def description(self):
        return self.get_op().description
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    @classmethod
    def get_urlname(cls):
        return 'dashboard.vm.op.%s' % cls.op
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    def get_url(self):
        return reverse(self.get_urlname(), args=(self.get_object().pk, ))
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    def get_wrapper_template_name(self):
        if self.request.is_ajax():
            return 'dashboard/_modal.html'
        else:
            return 'dashboard/_base.html'
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    @classmethod
    def get_op_by_object(cls, obj):
        return getattr(obj, cls.op)
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    def get_op(self):
        if not hasattr(self, '_opobj'):
            setattr(self, '_opobj', getattr(self.get_object(), self.op))
        return self._opobj
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    def get_context_data(self, **kwargs):
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        ctx = super(OperationView, self).get_context_data(**kwargs)
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        ctx['op'] = self.get_op()
        ctx['url'] = self.request.path
        return ctx
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    def get(self, request, *args, **kwargs):
        self.get_op().check_auth(request.user)
        response = super(OperationView, self).get(request, *args, **kwargs)
        response.render()
        response.content = render_to_string(self.get_wrapper_template_name(),
                                            {'body': response.content})
        return response
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    def post(self, request, extra=None, *args, **kwargs):
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        self.object = self.get_object()
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        if extra is None:
            extra = {}
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        try:
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            self.get_op().async(user=request.user, **extra)
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        except Exception as e:
            messages.error(request, _('Could not start operation.'))
            logger.error(e)
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        return redirect("%s#activity" % self.object.get_absolute_url())
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    @classmethod
    def factory(cls, op, icon='cog'):
        return type(str(cls.__name__ + op),
                    (cls, ), {'op': op, 'icon': icon})
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    @classmethod
    def bind_to_object(cls, instance):
        v = cls()
        v.get_object = lambda: instance
        return v


class VmOperationView(OperationView):

    model = Instance
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    context_object_name = 'instance'  # much simpler to mock object
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class FormOperationMixin(object):

    form_class = None

    def get_context_data(self, **kwargs):
        ctx = super(FormOperationMixin, self).get_context_data(**kwargs)
        if self.request.method == 'POST':
            ctx['form'] = self.form_class(self.request.POST)
        else:
            ctx['form'] = self.form_class()
        return ctx

    def post(self, request, extra=None, *args, **kwargs):
        if extra is None:
            extra = {}
        form = self.form_class(self.request.POST)
        if form.is_valid():
            extra.update(form.cleaned_data)
            return super(FormOperationMixin, self).post(
                request, extra, *args, **kwargs)
        else:
            return self.get(request)


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class VmCreateDiskView(FormOperationMixin, VmOperationView):

    op = 'create_disk'
    form_class = VmCreateDiskForm
    show_in_toolbar = False
    icon = 'hdd'


class VmDownloadDiskView(FormOperationMixin, VmOperationView):

    op = 'download_disk'
    form_class = VmDownloadDiskForm
    show_in_toolbar = False
    icon = 'download'


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class VmMigrateView(VmOperationView):

    op = 'migrate'
    icon = 'truck'
    template_name = 'dashboard/_vm-migrate.html'

    def get_context_data(self, **kwargs):
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        ctx = super(VmMigrateView, self).get_context_data(**kwargs)
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        ctx['nodes'] = [n for n in Node.objects.filter(enabled=True)
                        if n.state == "ONLINE"]
        return ctx

    def post(self, request, extra=None, *args, **kwargs):
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        if extra is None:
            extra = {}
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        node = self.request.POST.get("node")
        if node:
            node = get_object_or_404(Node, pk=node)
            extra["to_node"] = node
        return super(VmMigrateView, self).post(request, extra, *args, **kwargs)


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class VmSaveView(FormOperationMixin, VmOperationView):
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    op = 'save_as_template'
    icon = 'save'
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    form_class = VmSaveForm
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vm_ops = {
    'reset': VmOperationView.factory(op='reset', icon='bolt'),
    'deploy': VmOperationView.factory(op='deploy', icon='play'),
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    'migrate': VmMigrateView,
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    'reboot': VmOperationView.factory(op='reboot', icon='refresh'),
    'shut_off': VmOperationView.factory(op='shut_off', icon='ban-circle'),
    'shutdown': VmOperationView.factory(op='shutdown', icon='off'),
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    'save_as_template': VmSaveView,
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    'destroy': VmOperationView.factory(op='destroy', icon='remove'),
    'sleep': VmOperationView.factory(op='sleep', icon='moon'),
    'wake_up': VmOperationView.factory(op='wake_up', icon='sun'),
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    'create_disk': VmCreateDiskView,
    'download_disk': VmDownloadDiskView,
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}


def get_operations(instance, user):
    ops = []
    for k, v in vm_ops.iteritems():
        try:
            op = v.get_op_by_object(instance)
            op.check_auth(user)
            op.check_precond()
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        except Exception as e:
            logger.debug('Not showing operation %s for %s: %s',
                         k, instance, unicode(e))
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        else:
            ops.append(v.bind_to_object(instance))
    return ops
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class NodeDetailView(LoginRequiredMixin, SuperuserRequiredMixin, DetailView):
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    template_name = "dashboard/node-detail.html"
    model = Node
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    form = None
    form_class = TraitForm
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    def get_context_data(self, form=None, **kwargs):
        if form is None:
            form = self.form_class()
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        context = super(NodeDetailView, self).get_context_data(**kwargs)
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        instances = Instance.active.filter(node=self.object)
        context['table'] = NodeVmListTable(instances)
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        na = NodeActivity.objects.filter(
            node=self.object, parent=None
        ).order_by('-started').select_related()
        context['activities'] = na
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        context['trait_form'] = form
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        context['graphite_enabled'] = (
            NodeGraphView.get_graphite_url() is not None)
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        return context

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    def post(self, request, *args, **kwargs):
        if request.POST.get('new_name'):
            return self.__set_name(request)
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        if request.POST.get('to_remove'):
            return self.__remove_trait(request)
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        return redirect(reverse_lazy("dashboard.views.node-detail",
                                     kwargs={'pk': self.get_object().pk}))
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    def __set_name(self, request):
        self.object = self.get_object()
        new_name = request.POST.get("new_name")
        Node.objects.filter(pk=self.object.pk).update(
            **{'name': new_name})

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        success_message = _("Node successfully renamed.")
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        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
                'node_pk': self.object.pk
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            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(reverse_lazy("dashboard.views.node-detail",
                                         kwargs={'pk': self.object.pk}))

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    def __remove_trait(self, request):
        try:
            to_remove = request.POST.get('to_remove')
            self.object = self.get_object()
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            self.object.traits.remove(to_remove)
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            message = u"Success"
        except:  # note this won't really happen
            message = u"Not success"

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': message}),
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                content_type="application/json"
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            )
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        else:
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            return redirect(self.object.get_absolute_url())
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class GroupDetailView(CheckedDetailView):
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    template_name = "dashboard/group-detail.html"
    model = Group
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    read_level = 'operator'
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    def get_has_level(self):
        return self.object.profile.has_level
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    def get_context_data(self, **kwargs):
        context = super(GroupDetailView, self).get_context_data(**kwargs)
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        context['group'] = self.object
        context['users'] = self.object.user_set.all()
        context['acl'] = get_group_acl_data(self.object)
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        context['group_profile_form'] = GroupProfileUpdate.get_form_object(
            self.request, self.object.profile)
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        return context

    def post(self, request, *args, **kwargs):
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        self.object = self.get_object()
        if not self.get_has_level()(request.user, 'operator'):
            raise PermissionDenied()
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        if request.POST.get('new_name'):
            return self.__set_name(request)
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        if request.POST.get('list-new-name'):
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            return self.__add_user(request)
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        if request.POST.get('list-new-namelist'):
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            return self.__add_list(request)
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        if (request.POST.get('list-new-name') is not None) and \
                (request.POST.get('list-new-namelist') is not None):
            return redirect(reverse_lazy("dashboard.views.group-detail",
                                         kwargs={'pk': self.get_object().pk}))
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    def __add_user(self, request):
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        name = request.POST['list-new-name']
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        self.__add_username(request, name)
        return redirect(reverse_lazy("dashboard.views.group-detail",
                                     kwargs={'pk': self.object.pk}))
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    def __add_username(self, request, name):
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        if not name:
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            return
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        try:
            entity = User.objects.get(username=name)
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            self.object.user_set.add(entity)
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        except User.DoesNotExist:
            warning(request, _('User "%s" not found.') % name)
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    def __add_list(self, request):
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        if not self.get_has_level()(request.user, 'operator'):
            raise PermissionDenied()
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        userlist = request.POST.get('list-new-namelist').split('\r\n')
        for line in userlist:
            self.__add_username(request, line)
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        return redirect(reverse_lazy("dashboard.views.group-detail",
                                     kwargs={'pk': self.object.pk}))
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    def __set_name(self, request):
        new_name = request.POST.get("new_name")
        Group.objects.filter(pk=self.object.pk).update(
            **{'name': new_name})

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        success_message = _("Group successfully renamed.")
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        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
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                'group_pk': self.object.pk
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            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(reverse_lazy("dashboard.views.group-detail",
                                         kwargs={'pk': self.object.pk}))


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class AclUpdateView(LoginRequiredMixin, View, SingleObjectMixin):
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    def post(self, request, *args, **kwargs):
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        instance = self.get_object()
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        if not (instance.has_level(request.user, "owner") or
                getattr(instance, 'owner', None) == request.user):
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            logger.warning('Tried to set permissions of %s by non-owner %s.',
                           unicode(instance), unicode(request.user))
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            raise PermissionDenied()
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        self.set_levels(request, instance)
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        self.remove_levels(request, instance)
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        self.add_levels(request, instance)
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        return redirect("%s#access" % instance.get_absolute_url())
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    def set_levels(self, request, instance):
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        for key, value in request.POST.items():
            m = re.match('perm-([ug])-(\d+)', key)
            if m:
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                typ, id = m.groups()
                entity = {'u': User, 'g': Group}[typ].objects.get(id=id)
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                if getattr(instance, "owner", None) == entity:
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                    logger.info("Tried to set owner's acl level for %s by %s.",
                                unicode(instance), unicode(request.user))
                    continue
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                instance.set_level(entity, value)
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                logger.info("Set %s's acl level for %s to %s by %s.",
                            unicode(entity), unicode(instance),
                            value, unicode(request.user))
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    def remove_levels(self, request, instance):
        for key, value in request.POST.items():
            if key.startswith("remove"):
                typ = key[7:8]  # len("remove-")
                id = key[9:]  # len("remove-x-")
                entity = {'u': User, 'g': Group}[typ].objects.get(id=id)
                if getattr(instance, "owner", None) == entity:
                    logger.info("Tried to remove owner from %s by %s.",
                                unicode(instance), unicode(request.user))
                    msg = _("The original owner cannot be removed, however "
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                            "you can transfer ownership.")
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                    messages.warning(request, msg)
                    continue
                instance.set_level(entity, None)
                logger.info("Revoked %s's access to %s by %s.",
                            unicode(entity), unicode(instance),
                            unicode(request.user))

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    def add_levels(self, request, instance):
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        name = request.POST['perm-new-name']
        value = request.POST['perm-new']
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        if not name:
            return
        try:
            entity = User.objects.get(username=name)
        except User.DoesNotExist:
            entity = None
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            try:
                entity = Group.objects.get(name=name)
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            except Group.DoesNotExist:
                warning(request, _('User or group "%s" not found.') % name)
                return

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        instance.set_level(entity, value)
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        logger.info("Set %s's new acl level for %s to %s by %s.",
                    unicode(entity), unicode(instance),
                    value, unicode(request.user))
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class TemplateAclUpdateView(AclUpdateView):
    model = InstanceTemplate

    def post(self, request, *args, **kwargs):
        template = self.get_object()
        if not (template.has_level(request.user, "owner") or
                getattr(template, 'owner', None) == request.user):
            logger.warning('Tried to set permissions of %s by non-owner %s.',
                           unicode(template), unicode(request.user))
            raise PermissionDenied()
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        name = request.POST['perm-new-name']
        if (User.objects.filter(username=name).count() +
                Group.objects.filter(name=name).count() < 1
                and len(name) > 0):
            warning(request, _('User or group "%s" not found.') % name)
        else:
            self.set_levels(request, template)
            self.add_levels(request, template)
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            self.remove_levels(request, template)
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            post_for_disk = request.POST.copy()
            post_for_disk['perm-new'] = 'user'
            request.POST = post_for_disk
            for d in template.disks.all():
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                self.set_levels(request, d)
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                self.add_levels(request, d)
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                self.remove_levels(request, d)
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        return redirect(template)
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class GroupAclUpdateView(AclUpdateView):
    model = Group

    def post(self, request, *args, **kwargs):
        instance = self.get_object().profile
        if not (instance.has_level(request.user, "owner") or
                getattr(instance, 'owner', None) == request.user):
            logger.warning('Tried to set permissions of %s by non-owner %s.',
                           unicode(instance), unicode(request.user))
            raise PermissionDenied()
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        self.set_levels(request, instance)
        self.add_levels(request, instance)
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        return redirect(reverse("dashboard.views.group-detail",
                                kwargs=self.kwargs))


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class TemplateChoose(TemplateView):

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/modal-wrapper.html']
        else:
            return ['dashboard/nojs-wrapper.html']

    def get_context_data(self, *args, **kwargs):
        context = super(TemplateChoose, self).get_context_data(*args, **kwargs)
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        templates = InstanceTemplate.get_objects_with_level("user",
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                                                            self.request.user)
        context.update({
            'box_title': _('Choose template'),
            'ajax_title': False,
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            'template': "dashboard/_template-choose.html",
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            'templates': templates.all(),
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        })
        return context

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    def post(self, request, *args, **kwargs):
        if not request.user.has_perm('vm.create_template'):
            raise PermissionDenied()

        template = request.POST.get("parent")
        if template == "base_vm":
            return redirect(reverse("dashboard.views.template-create"))
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        elif template is None:
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            messages.warning(request, _("Select an option to proceed."))
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            return redirect(reverse("dashboard.views.template-choose"))
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        else:
            template = get_object_or_404(InstanceTemplate, pk=template)

        instance = Instance.create_from_template(
            template=template, owner=request.user, is_base=True)

        return redirect(instance.get_absolute_url())

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class TemplateCreate(SuccessMessageMixin, CreateView):
    model = InstanceTemplate
    form_class = TemplateForm

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    def get_template_names(self):
        if self.request.is_ajax():
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            pass
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        else:
            return ['dashboard/nojs-wrapper.html']

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

        context.update({
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            'box_title': _("Create a new base VM"),
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            'template': "dashboard/_template-create.html",
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            'leases': Lease.objects.count()
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        })
        return context

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    def get(self, *args, **kwargs):
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        if not self.request.user.has_perm('vm.create_template'):
            raise PermissionDenied()
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        return super(TemplateCreate, self).get(*args, **kwargs)

    def get_form_kwargs(self):
        kwargs = super(TemplateCreate, self).get_form_kwargs()
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        kwargs['user'] = self.request.user
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        return kwargs

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    def post(self, request, *args, **kwargs):
        if not self.request.user.has_perm('vm.create_template'):
            raise PermissionDenied()
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        form = self.form_class(request.POST, user=request.user)
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        if not form.is_valid():
            return self.get(request, form, *args, **kwargs)
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        else:
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            post = form.cleaned_data
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            networks = self.__create_networks(post.pop("networks"),
                                              request.user)
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            post.pop("parent")
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            post['max_ram_size'] = post['ram_size']
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            req_traits = post.pop("req_traits")
            tags = post.pop("tags")
            post['pw'] = User.objects.make_random_password()
            post['is_base'] = True
            inst = Instance.create(params=post, disks=[],
                                   networks=networks,
                                   tags=tags, req_traits=req_traits)
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            return redirect("%s#resources" % inst.get_absolute_url())
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        return super(TemplateCreate, self).post(self, request, args, kwargs)

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    def __create_networks(self, vlans, user):
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        networks = []
        for v in vlans:
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            if not v.has_level(user, "user"):
                raise PermissionDenied()
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            networks.append(InterfaceTemplate(vlan=v, managed=v.managed))
        return networks

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    def get_success_url(self):
        return reverse_lazy("dashboard.views.template-list")


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class TemplateDetail(LoginRequiredMixin, SuccessMessageMixin, UpdateView):
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    model = InstanceTemplate
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    template_name = "dashboard/template-edit.html"
    form_class = TemplateForm
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    success_message = _("Successfully modified template.")
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    def get(self, request, *args, **kwargs):
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        template = self.get_object()
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        if not template.has_level(request.user, 'user'):
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            raise PermissionDenied()
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        if request.is_ajax():
            template = {
                'num_cores': template.num_cores,
                'ram_size': template.ram_size,
                'priority': template.priority,
                'arch': template.arch,
                'description': template.description,
                'system': template.system,
                'name': template.name,
                'disks': [{'pk': d.pk, 'name': d.name}
                          for d in template.disks.all()],
                'network': [
                    {'vlan_pk': i.vlan.pk, 'vlan': i.vlan.name,
                     'managed': i.managed}
                    for i in InterfaceTemplate.objects.filter(
                        template=self.get_object()).all()
                ]
            }
            return HttpResponse(json.dumps(template),
                                content_type="application/json")
        else:
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            return super(TemplateDetail, self).get(request, *args, **kwargs)

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    def get_context_data(self, **kwargs):
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        obj = self.get_object()
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        context = super(TemplateDetail, self).get_context_data(**kwargs)
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        context['acl'] = get_vm_acl_data(obj)
        context['disks'] = obj.disks.all()
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        return context

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    def get_success_url(self):
        return reverse_lazy("dashboard.views.template-detail",
                            kwargs=self.kwargs)

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    def post(self, request, *args, **kwargs):
        template = self.get_object()
        if not template.has_level(request.user, 'owner'):
            raise PermissionDenied()
        for disk in self.get_object().disks.all():
            if not disk.has_level(request.user, 'user'):
                raise PermissionDenied()
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        for network in self.get_object().interface_set.all():
            if not network.vlan.has_level(request.user, "user"):
                raise PermissionDenied()
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        return super(TemplateDetail, self).post(self, request, args, kwargs)

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    def get_form_kwargs(self):
        kwargs = super(TemplateDetail, self).get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs

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class TemplateList(LoginRequiredMixin, SingleTableView):
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    template_name = "dashboard/template-list.html"
    model = InstanceTemplate
    table_class = TemplateListTable
    table_pagination = False

    def get_context_data(self, *args, **kwargs):
        context = super(TemplateList, self).get_context_data(*args, **kwargs)
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        context['lease_table'] = LeaseListTable(Lease.objects.all(),
                                                request=self.request)
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        return context
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    def get_queryset(self):
        logger.debug('TemplateList.get_queryset() called. User: %s',
                     unicode(self.request.user))
        return InstanceTemplate.get_objects_with_level(
            'user', self.request.user).all()

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class TemplateDelete(LoginRequiredMixin, DeleteView):
    model = InstanceTemplate

    def get_success_url(self):
        return reverse("dashboard.views.template-list")

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def delete(self, request, *args, **kwargs):
        object = self.get_object()
        if not object.has_level(request.user, 'owner'):
            raise PermissionDenied()

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        object.destroy_disks()
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        object.delete()
        success_url = self.get_success_url()
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        success_message = _("Template successfully deleted.")
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        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect(success_url)


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class VmList(LoginRequiredMixin, FilterMixin, ListView):
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    template_name = "dashboard/vm-list.html"
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    allowed_filters = {
        'name': "name__icontains",
        'node': "node__name__icontains",
        'status': "status__iexact",
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        'tags[]': "tags__name__in",
        'tags': "tags__name__in",  # for search string
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        'owner': "owner__username",
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    }
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    def get(self, *args, **kwargs):
        if self.request.is_ajax():
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            favs = Instance.objects.filter(
                favourite__user=self.request.user).values_list('pk', flat=True)
            instances = Instance.get_objects_with_level(
                'user', self.request.user).filter(
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                destroyed_at=None).all()
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            instances = [{
                'pk': i.pk,
                'name': i.name,
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                'icon': i.get_status_icon(),
                'host': "" if not i.primary_host else i.primary_host.hostname,
                'status': i.get_status_display(),
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                'fav': i.pk in favs} for i in instances]
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            return HttpResponse(
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                json.dumps(list(instances)),  # instances is ValuesQuerySet
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                content_type="application/json",
            )
        else:
            return super(VmList, self).get(*args, **kwargs)

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    def get_queryset(self):
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        logger.debug('VmList.get_queryset() called. User: %s',
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                     unicode(self.request.user))
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        queryset = Instance.get_objects_with_level(
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            'user', self.request.u