views.py

# 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/>.

from __future__ import unicode_literals, absolute_import

from itertools import chain
from os import getenv
import json
import logging
import re
import requests

from django.conf import settings
from django.contrib.auth.models import User, Group
from django.contrib.auth.views import login, redirect_to_login
from django.contrib.messages import warning
from django.contrib.messages.views import SuccessMessageMixin
from django.core.exceptions import (
    PermissionDenied, SuspiciousOperation,
)
from django.core import signing
from django.core.urlresolvers import reverse, reverse_lazy
from django.db.models import Count
from django.http import HttpResponse, HttpResponseRedirect, Http404
from django.shortcuts import redirect, render, get_object_or_404
from django.views.decorators.http import require_GET, require_POST
from django.views.generic.detail import SingleObjectMixin
from django.views.generic import (TemplateView, DetailView, View, DeleteView,
                                  UpdateView, CreateView, ListView)
from django.contrib import messages
from django.utils.translation import ugettext as _
from django.utils.translation import ungettext as __
from django.template.loader import render_to_string
from django.template import RequestContext

from django.forms.models import inlineformset_factory
from django_tables2 import SingleTableView
from braces.views import (LoginRequiredMixin, SuperuserRequiredMixin,
                          PermissionRequiredMixin)
from braces.views._access import AccessMixin

from .forms import (
    CircleAuthenticationForm, HostForm, LeaseForm, MyProfileForm,
    NodeForm, TemplateForm, TraitForm, VmCustomizeForm, GroupCreateForm,
    UserCreationForm, GroupProfileUpdateForm, UnsubscribeForm,
    VmSaveForm,
    CirclePasswordChangeForm, VmCreateDiskForm, VmDownloadDiskForm,
)

from .tables import (
    NodeListTable, NodeVmListTable, TemplateListTable, LeaseListTable,
    GroupListTable,
)
from vm.models import (
    Instance, instance_activity, InstanceActivity, InstanceTemplate, Interface,
    InterfaceTemplate, Lease, Node, NodeActivity, Trait,
)
from storage.models import Disk
from firewall.models import Vlan, Host, Rule
from .models import Favourite, Profile, GroupProfile

logger = logging.getLogger(__name__)
saml_available = hasattr(settings, "SAML_CONFIG")


def search_user(keyword):
    try:
        return User.objects.get(username=keyword)
    except User.DoesNotExist:
        try:
            return User.objects.get(profile__org_id=keyword)
        except User.DoesNotExist:
            return User.objects.get(email=keyword)


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', [])
                for group in chain(*[attributes[i]
                                     for i in owneratrs if i in attributes]):
                    try:
                        GroupProfile.search(group)
                    except Group.DoesNotExist:
                        newgroups.append(group)

        return newgroups


class FilterMixin(object):

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

        return filters

    def get_queryset(self):
        return super(FilterMixin,
                     self).get_queryset().filter(**self.get_queryset_filters())


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

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

        # instances
        favs = Instance.objects.filter(favourite__user=self.request.user)
        instances = Instance.get_objects_with_level(
            'user', user, disregard_superuser=True).filter(destroyed_at=None)
        display = list(favs) + list(set(instances) - set(favs))
        for d in display:
            d.fav = True if d in favs else False
        context.update({
            'instances': display[:5],
            'more_instances': instances.count() - len(instances[:5])
        })

        running = instances.filter(status='RUNNING')
        stopped = instances.exclude(status__in=('RUNNING', 'NOSTATE'))

        context.update({
            'running_vms': running[:20],
            'running_vm_num': running.count(),
            'stopped_vm_num': stopped.count()
        })

        # nodes
        if user.is_superuser:
            nodes = Node.objects.all()
            context.update({
                'nodes': nodes[:5],
                'more_nodes': nodes.count() - len(nodes[:5]),
                '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
        if user.has_module_perms('auth'):
            profiles = GroupProfile.get_objects_with_level('operator', user)
            groups = Group.objects.filter(groupprofile__in=profiles)
            context.update({
                'groups': groups[:5],
                'more_groups': groups.count() - len(groups[:5]),
            })

        # template
        if user.has_perm('vm.create_template'):
            context['templates'] = InstanceTemplate.get_objects_with_level(
                'operator', user).all()[:5]

        return context


def get_vm_acl_data(obj):
    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])}


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])}


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

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

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


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:
            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)
        else:
            raise Http404()


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

    def get_context_data(self, **kwargs):
        context = super(VmDetailView, self).get_context_data(**kwargs)
        instance = context['instance']
        ops = get_operations(instance, self.request.user)
        context.update({
            'graphite_enabled': VmGraphView.get_graphite_url() is not None,
            'vnc_url': reverse_lazy("dashboard.views.detail-vnc",
                                    kwargs={'pk': self.object.pk}),
            'ops': ops,
            'op': {i.op: i for i in ops},
        })

        # activity data
        context['activities'] = self.object.get_activities(self.request.user)

        context['vlans'] = Vlan.get_objects_with_level(
            'user', self.request.user
        ).exclude(  # exclude already added interfaces
            pk__in=Interface.objects.filter(
                instance=self.get_object()).values_list("vlan", flat=True)
        ).all()
        context['acl'] = get_vm_acl_data(instance)
        context['os_type_icon'] = instance.os_type.replace("unknown",
                                                           "question")
        # ipv6 infos
        context['ipv6_host'] = instance.get_connect_host(use_ipv6=True)
        context['ipv6_port'] = instance.get_connect_port(use_ipv6=True)
        return context

    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)

        options = {
            'change_password': self.__change_password,
            'new_name': self.__set_name,
            'new_description': self.__set_description,
            'new_tag': self.__add_tag,
            'to_remove': self.__remove_tag,
            'port': self.__add_port,
            'new_network_vlan': self.__new_network,
            'abort_operation': self.__abort_operation,
        }
        for k, v in options.iteritems():
            if request.POST.get(k) is not None:
                return v(request)

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

        self.object.change_password(user=request.user)
        messages.success(request, _("Password changed."))
        if request.is_ajax():
            return HttpResponse("Success.")
        else:
            return redirect(reverse_lazy("dashboard.views.detail",
                                         kwargs={'pk': self.object.pk}))

    def __set_resources(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()
        if not request.user.has_perm('vm.change_resources'):
            raise PermissionDenied()

        resources = {
            'num_cores': request.POST.get('cpu-count'),
            'ram_size': request.POST.get('ram-size'),
            'max_ram_size': request.POST.get('ram-size'),  # TODO: max_ram
            'priority': request.POST.get('cpu-priority')
        }
        Instance.objects.filter(pk=self.object.pk).update(**resources)

        success_message = _("Resources successfully updated.")
        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}))

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

        success_message = _("VM successfully renamed.")
        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)
            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})

        success_message = _("VM description successfully updated.")
        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())

    def __add_tag(self, request):
        new_tag = request.POST.get('new_tag')
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        if len(new_tag) < 1:
            message = u"Please input something."
        elif len(new_tag) > 20:
            message = u"Tag name is too long."
        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()
            if not self.object.has_level(request.user, 'owner'):
                raise PermissionDenied()

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

    def __add_port(self, request):
        object = self.get_object()
        if (not object.has_level(request.user, 'owner') or
                not request.user.has_perm('vm.config_ports')):
            raise PermissionDenied()

        port = request.POST.get("port")
        proto = request.POST.get("proto")

        try:
            error = None
            interfaces = object.interface_set.all()
            host = Host.objects.get(pk=request.POST.get("host_pk"),
                                    interface__in=interfaces)
            host.add_port(proto, private=port)
        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()
        except ValueError:
            error = _("There is a problem with your input.")
        except Exception as e:
            error = _("Unknown error.")
            logger.error(e)

        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}))

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

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

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

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


class OperationView(DetailView):

    template_name = 'dashboard/operate.html'
    show_in_toolbar = True

    @property
    def name(self):
        return self.get_op().name

    @property
    def description(self):
        return self.get_op().description

    @classmethod
    def get_urlname(cls):
        return 'dashboard.vm.op.%s' % cls.op

    def get_url(self):
        return reverse(self.get_urlname(), args=(self.get_object().pk, ))

    def get_wrapper_template_name(self):
        if self.request.is_ajax():
            return 'dashboard/_modal.html'
        else:
            return 'dashboard/_base.html'

    @classmethod
    def get_op_by_object(cls, obj):
        return getattr(obj, cls.op)

    def get_op(self):
        if not hasattr(self, '_opobj'):
            setattr(self, '_opobj', getattr(self.get_object(), self.op))
        return self._opobj

    def get_context_data(self, **kwargs):
        ctx = super(OperationView, self).get_context_data(**kwargs)
        ctx['op'] = self.get_op()
        ctx['url'] = self.request.path
        return ctx

    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

    def post(self, request, extra=None, *args, **kwargs):
        self.object = self.get_object()
        if extra is None:
            extra = {}
        try:
            self.get_op().async(user=request.user, **extra)
        except Exception as e:
            messages.error(request, _('Could not start operation.'))
            logger.error(e)
        return redirect("%s#activity" % self.object.get_absolute_url())

    @classmethod
    def factory(cls, op, icon='cog'):
        return type(str(cls.__name__ + op),
                    (cls, ), {'op': op, 'icon': icon})

    @classmethod
    def bind_to_object(cls, instance):
        v = cls()
        v.get_object = lambda: instance
        return v


class VmOperationView(OperationView):

    model = Instance
    context_object_name = 'instance'  # much simpler to mock object


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)


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'


class VmMigrateView(VmOperationView):

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

    def get_context_data(self, **kwargs):
        ctx = super(VmMigrateView, self).get_context_data(**kwargs)
        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):
        if extra is None:
            extra = {}
        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)


class VmSaveView(FormOperationMixin, VmOperationView):

    op = 'save_as_template'
    icon = 'save'
    form_class = VmSaveForm

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


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()
        except Exception as e:
            logger.debug('Not showing operation %s for %s: %s',
                         k, instance, unicode(e))
        else:
            ops.append(v.bind_to_object(instance))
    return ops


class NodeDetailView(LoginRequiredMixin, SuperuserRequiredMixin, DetailView):
    template_name = "dashboard/node-detail.html"
    model = Node
    form = None
    form_class = TraitForm

    def get_context_data(self, form=None, **kwargs):
        if form is None:
            form = self.form_class()
        context = super(NodeDetailView, self).get_context_data(**kwargs)
        instances = Instance.active.filter(node=self.object)
        context['table'] = NodeVmListTable(instances)
        na = NodeActivity.objects.filter(
            node=self.object, parent=None
        ).order_by('-started').select_related()
        context['activities'] = na
        context['trait_form'] = form
        context['graphite_enabled'] = (
            NodeGraphView.get_graphite_url() is not None)
        return context

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

    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})

        success_message = _("Node successfully renamed.")
        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
                'node_pk': self.object.pk
            }
            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}))

    def __remove_trait(self, request):
        try:
            to_remove = request.POST.get('to_remove')
            self.object = self.get_object()
            self.object.traits.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"
            )
        else:
            return redirect(self.object.get_absolute_url())


class GroupDetailView(CheckedDetailView):
    template_name = "dashboard/group-detail.html"
    model = Group
    read_level = 'operator'

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

    def get_context_data(self, **kwargs):
        context = super(GroupDetailView, self).get_context_data(**kwargs)
        context['group'] = self.object
        context['users'] = self.object.user_set.all()
        context['acl'] = get_group_acl_data(self.object)
        context['group_profile_form'] = GroupProfileUpdate.get_form_object(
            self.request, self.object.profile)
        return context

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        if not self.get_has_level()(request.user, 'operator'):
            raise PermissionDenied()
        if request.POST.get('new_name'):
            return self.__set_name(request)
        if request.POST.get('list-new-name'):
            return self.__add_user(request)
        if request.POST.get('list-new-namelist'):
            return self.__add_list(request)
        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}))

    def __add_user(self, request):
        name = request.POST['list-new-name']
        self.__add_username(request, name)
        return redirect(reverse_lazy("dashboard.views.group-detail",
                                     kwargs={'pk': self.object.pk}))

    def __add_username(self, request, name):
        if not name:
            return
        try:
            entity = User.objects.get(username=name)
            self.object.user_set.add(entity)
        except User.DoesNotExist:
            warning(request, _('User "%s" not found.') % name)

    def __add_list(self, request):
        if not self.get_has_level()(request.user, 'operator'):
            raise PermissionDenied()
        userlist = request.POST.get('list-new-namelist').split('\r\n')
        for line in userlist:
            self.__add_username(request, line)
        return redirect(reverse_lazy("dashboard.views.group-detail",
                                     kwargs={'pk': self.object.pk}))

    def __set_name(self, request):
        new_name = request.POST.get("new_name")
        Group.objects.filter(pk=self.object.pk).update(
            **{'name': new_name})

        success_message = _("Group successfully renamed.")
        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
                'group_pk': self.object.pk
            }
            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}))


class AclUpdateView(LoginRequiredMixin, View, SingleObjectMixin):

    def post(self, request, *args, **kwargs):
        instance = self.get_object()
        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()
        self.set_levels(request, instance)
        self.remove_levels(request, instance)
        self.add_levels(request, instance)
        return redirect("%s#access" % instance.get_absolute_url())

    def set_levels(self, request, instance):
        for key, value in request.POST.items():
            m = re.match('perm-([ug])-(\d+)', key)
            if m:
                typ, id = m.groups()
                entity = {'u': User, 'g': Group}[typ].objects.get(id=id)
                if getattr(instance, "owner", None) == entity:
                    logger.info("Tried to set owner's acl level for %s by %s.",
                                unicode(instance), unicode(request.user))
                    continue
                instance.set_level(entity, value)
                logger.info("Set %s's acl level for %s to %s by %s.",
                            unicode(entity), unicode(instance),
                            value, unicode(request.user))

    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 "
                            "you can transfer ownership.")
                    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))

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

        instance.set_level(entity, value)
        logger.info("Set %s's new acl level for %s to %s by %s.",
                    unicode(entity), unicode(instance),
                    value, unicode(request.user))


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()

        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)
            self.remove_levels(request, template)

            post_for_disk = request.POST.copy()
            post_for_disk['perm-new'] = 'user'
            request.POST = post_for_disk
            for d in template.disks.all():
                self.set_levels(request, d)
                self.add_levels(request, d)
                self.remove_levels(request, d)

        return redirect(template)


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()

        self.set_levels(request, instance)
        self.add_levels(request, instance)
        return redirect(reverse("dashboard.views.group-detail",
                                kwargs=self.kwargs))


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

    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"))
        elif template is None:
            messages.warning(request, _("Select an option to proceed."))
            return redirect(reverse("dashboard.views.template-choose"))
        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())


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

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

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

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

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

        return super(TemplateCreate, self).get(*args, **kwargs)

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

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

        form = self.form_class(request.POST, user=request.user)
        if not form.is_valid():
            return self.get(request, form, *args, **kwargs)
        else:
            post = form.cleaned_data
            networks = self.__create_networks(post.pop("networks"),
                                              request.user)
            post.pop("parent")
            post['max_ram_size'] = post['ram_size']
            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)

            return redirect("%s#resources" % inst.get_absolute_url())

        return super(TemplateCreate, self).post(self, request, args, kwargs)

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

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


class TemplateDetail(LoginRequiredMixin, SuccessMessageMixin, UpdateView):
    model = InstanceTemplate
    template_name = "dashboard/template-edit.html"
    form_class = TemplateForm
    success_message = _("Successfully modified template.")

    def get(self, request, *args, **kwargs):
        template = self.get_object()
        if not template.has_level(request.user, 'user'):
            raise PermissionDenied()
        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:
            return super(TemplateDetail, self).get(request, *args, **kwargs)

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

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

    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()
        for network in self.get_object().interface_set.all():
            if not network.vlan.has_level(request.user, "user"):
                raise PermissionDenied()
        return super(TemplateDetail, self).post(self, request, args, kwargs)

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


class TemplateList(LoginRequiredMixin, SingleTableView):
    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)
        context['lease_table'] = LeaseListTable(Lease.objects.all(),
                                                request=self.request)
        return context

    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()


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()

        object.delete()
        success_url = self.get_success_url()
        success_message = _("Template successfully deleted.")

        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)


class VmList(LoginRequiredMixin, FilterMixin, ListView):
    template_name = "dashboard/vm-list.html"
    allowed_filters = {
        'name': "name__icontains",
        'node': "node__name__icontains",
        'status': "status__iexact",
        'tags[]': "tags__name__in",
        'tags': "tags__name__in",  # for search string
        'owner': "owner__username",
    }

    def get(self, *args, **kwargs):
        if self.request.is_ajax():
            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(
                destroyed_at=None).all()
            instances = [{
                'pk': i.pk,
                'name': i.name,
                'icon': i.get_status_icon(),
                'host': "" if not i.primary_host else i.primary_host.hostname,
                'status': i.get_status_display(),
                'fav': i.pk in favs} for i in instances]
            return HttpResponse(
                json.dumps(list(instances)),  # instances is ValuesQuerySet
                content_type="application/json",
            )
        else:
            return super(VmList, self).get(*args, **kwargs)

    def get_queryset(self):
        logger.debug('VmList.get_queryset() called. User: %s',
                     unicode(self.request.user))
        queryset = Instance.get_objects_with_level(
            'user', self.request.user).filter(destroyed_at=None)