views.py 110 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 collections import OrderedDict
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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.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, Q
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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
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from django.utils.translation import ugettext as _, ugettext_noop
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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 django_sshkey.models import UserKey

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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, UserKeyForm, VmRenewForm,
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    CirclePasswordChangeForm, VmCreateDiskForm, VmDownloadDiskForm,
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    TraitsForm, RawDataForm, GroupPermissionForm, AclUserAddForm
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)
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from .tables import (
    NodeListTable, NodeVmListTable, TemplateListTable, LeaseListTable,
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    GroupListTable, UserKeyListTable
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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, FutureMember
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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 RedirectToLoginMixin(AccessMixin):

    redirect_exception_classes = (PermissionDenied, )

    def dispatch(self, request, *args, **kwargs):
        try:
            return super(RedirectToLoginMixin, self).dispatch(
                request, *args, **kwargs)
        except self.redirect_exception_classes:
            if not request.user.is_authenticated():
                return redirect_to_login(request.get_full_path(),
                                         self.get_login_url(),
                                         self.get_redirect_field_name())
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            else:
                raise
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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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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()
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        if not request.user.has_perm('vm.access_console'):
            raise PermissionDenied()
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        if self.object.node:
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            with instance_activity(
                    code_suffix='console-accessed', instance=self.object,
                    user=request.user, readable_name=ugettext_noop(
                        "console access"), concurrency_check=False):
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                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({
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            'graphite_enabled': settings.GRAPHITE_URL is not None,
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            '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_merged_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'] = AclUpdateView.get_acl_data(
            instance, self.request.user, 'dashboard.views.vm-acl')
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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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        # resources forms
        if self.request.user.is_superuser:
            context['traits_form'] = TraitsForm(instance=instance)
            context['raw_data_form'] = RawDataForm(instance=instance)
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        # resources change perm
        context['can_change_resources'] = self.request.user.has_perm(
            "vm.change_resources")
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        return context
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    def post(self, request, *args, **kwargs):
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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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        raise Http404()

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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_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 VmTraitsUpdate(SuperuserRequiredMixin, UpdateView):
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    form_class = TraitsForm
    model = Instance

    def get_success_url(self):
        return self.get_object().get_absolute_url() + "#resources"


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class VmRawDataUpdate(SuperuserRequiredMixin, UpdateView):
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    form_class = RawDataForm
    model = Instance

    def get_success_url(self):
        return self.get_object().get_absolute_url() + "#resources"


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class OperationView(RedirectToLoginMixin, DetailView):
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    template_name = 'dashboard/operate.html'
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    show_in_toolbar = True
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    effect = None
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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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    def is_preferred(self):
        return self.get_op().is_preferred()

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    @classmethod
    def get_urlname(cls):
        return 'dashboard.vm.op.%s' % cls.op
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    @classmethod
    def get_instance_url(cls, pk, key=None, *args, **kwargs):
        url = reverse(cls.get_urlname(), args=(pk, ) + args, kwargs=kwargs)
        if key is None:
            return url
        else:
            return "%s?k=%s" % (url, key)

    def get_url(self, **kwargs):
        return self.get_instance_url(self.get_object().pk, **kwargs)
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    def get_template_names(self):
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        if self.request.is_ajax():
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            return ['dashboard/_modal.html']
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        else:
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            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()
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        ctx['opview'] = self
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        url = self.request.path
        if self.request.GET:
            url += '?' + self.request.GET.urlencode()
        ctx['url'] = url
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        ctx['template'] = super(OperationView, self).get_template_names()[0]
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        return ctx
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    def check_auth(self):
        logger.debug("OperationView.check_auth(%s)", unicode(self))
        self.get_op().check_auth(self.request.user)

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    def get(self, request, *args, **kwargs):
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        self.check_auth()
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        return super(OperationView, self).get(request, *args, **kwargs)
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    def post(self, request, extra=None, *args, **kwargs):
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        self.check_auth()
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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.'))
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            logger.exception(e)
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        else:
            messages.success(request, _('Operation is started.'))
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        return redirect("%s#activity" % self.object.get_absolute_url())
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    @classmethod
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    def factory(cls, op, icon='cog', effect='info', extra_bases=(), **kwargs):
        kwargs.update({'op': op, 'icon': icon, 'effect': effect})
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        return type(str(cls.__name__ + op),
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                    tuple(list(extra_bases) + [cls]), kwargs)
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    @classmethod
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    def bind_to_object(cls, instance, **kwargs):
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        me = cls()
        me.get_object = lambda: instance
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        for key, value in kwargs.iteritems():
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            setattr(me, key, value)
        return me
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class AjaxOperationMixin(object):
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    def post(self, request, extra=None, *args, **kwargs):
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        resp = super(AjaxOperationMixin, self).post(
            request, extra, *args, **kwargs)
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        if request.is_ajax():
            store = messages.get_messages(request)
            store.used = True
            return HttpResponse(
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                json.dumps({'success': True,
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                            'messages': [unicode(m) for m in store]}),
                content_type="application=json"
            )
        else:
            return resp

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class VmOperationView(AjaxOperationMixin, OperationView):

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


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class FormOperationMixin(object):

    form_class = None

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    def get_form_kwargs(self):
        return {}

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

    def post(self, request, extra=None, *args, **kwargs):
        if extra is None:
            extra = {}
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        form = self.form_class(self.request.POST, **self.get_form_kwargs())
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        if form.is_valid():
            extra.update(form.cleaned_data)
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            resp = super(FormOperationMixin, self).post(
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                request, extra, *args, **kwargs)
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            if request.is_ajax():
                return HttpResponse(
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                    json.dumps({'success': True}),
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                    content_type="application=json"
                )
            else:
                return resp
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        else:
            return self.get(request)


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class RequestFormOperationMixin(FormOperationMixin):

    def get_form_kwargs(self):
        val = super(FormOperationMixin, self).get_form_kwargs()
        val.update({'request': self.request})
        return val


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class VmCreateDiskView(FormOperationMixin, VmOperationView):

    op = 'create_disk'
    form_class = VmCreateDiskForm
    show_in_toolbar = False
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    icon = 'hdd-o'
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    is_disk_operation = True
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class VmDownloadDiskView(FormOperationMixin, VmOperationView):

    op = 'download_disk'
    form_class = VmDownloadDiskForm
    show_in_toolbar = False
    icon = 'download'
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    is_disk_operation = True
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class VmMigrateView(VmOperationView):

    op = 'migrate'
    icon = 'truck'
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    effect = 'info'
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    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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    effect = 'info'
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    form_class = VmSaveForm
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class VmResourcesChangeView(VmOperationView):
    op = 'resources_change'
    icon = "save"
    show_in_toolbar = False

    def post(self, request, extra=None, *args, **kwargs):
        if extra is None:
            extra = {}

        resources = {
            'num_cores': "cpu-count",
            'priority': "cpu-priority",
            'ram_size': "ram-size",
            "max_ram_size": "ram-size",  # TODO
        }
        for k, v in resources.iteritems():
            extra[k] = request.POST.get(v)

        return super(VmResourcesChangeView, self).post(request, extra,
                                                       *args, **kwargs)


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class TokenOperationView(OperationView):
    """Abstract operation view with token support.

    User can do the action with a valid token instead of logging in.
    """
    token_max_age = 3 * 24 * 3600
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    redirect_exception_classes = (PermissionDenied, SuspiciousOperation, )
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    @classmethod
    def get_salt(cls):
        return unicode(cls)

    @classmethod
    def get_token(cls, instance, user):
        t = tuple([getattr(i, 'pk', i) for i in [instance, user]])
        return signing.dumps(t, salt=cls.get_salt(), compress=True)

    @classmethod
    def get_token_url(cls, instance, user):
        key = cls.get_token(instance, user)
        return cls.get_instance_url(instance.pk, key)

    def check_auth(self):
        if 'k' in self.request.GET:
            try:  # check if token is needed at all
                return super(TokenOperationView, self).check_auth()
            except Exception:
                op = self.get_op()
                pk = op.instance.pk
                key = self.request.GET.get('k')

                logger.debug("checking token supplied to %s",
                             self.request.get_full_path())
                try:
                    user = self.validate_key(pk, key)
                except signing.SignatureExpired:
                    messages.error(self.request, _('The token has expired.'))
                else:
                    logger.info("Request user changed to %s at %s",
                                user, self.request.get_full_path())
                    self.request.user = user
        else:
            logger.debug("no token supplied to %s",
                         self.request.get_full_path())

        return super(TokenOperationView, self).check_auth()

    def validate_key(self, pk, key):
        """Get object based on signed token.
        """
        try:
            data = signing.loads(key, salt=self.get_salt())
            logger.debug('Token data: %s', unicode(data))
            instance, user = data
            logger.debug('Extracted token data: instance: %s, user: %s',
                         unicode(instance), unicode(user))
        except (signing.BadSignature, ValueError, TypeError) as e:
            logger.warning('Tried invalid token. Token: %s, user: %s. %s',
                           key, unicode(self.request.user), unicode(e))
            raise SuspiciousOperation()

        try:
            instance, user = signing.loads(key, max_age=self.token_max_age,
                                           salt=self.get_salt())
            logger.debug('Extracted non-expired token data: %s, %s',
                         unicode(instance), unicode(user))
        except signing.BadSignature as e:
            raise signing.SignatureExpired()

        if pk != instance:
            logger.debug('pk (%d) != instance (%d)', pk, instance)
            raise SuspiciousOperation()
        user = User.objects.get(pk=user)
        return user


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class VmRenewView(FormOperationMixin, TokenOperationView, VmOperationView):

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    op = 'renew'
    icon = 'calendar'
    effect = 'info'
    show_in_toolbar = False
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    form_class = VmRenewForm

    def get_form_kwargs(self):
        choices = Lease.get_objects_with_level("user", self.request.user)
        default = self.get_op().instance.lease
        if default and default not in choices:
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            choices = (choices.distinct() |
                       Lease.objects.filter(pk=default.pk).distinct())
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        val = super(VmRenewView, self).get_form_kwargs()
        val.update({'choices': choices, 'default': default})
        return val
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vm_ops = OrderedDict([
    ('deploy', VmOperationView.factory(
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        op='deploy', icon='play', effect='success')),
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    ('wake_up', VmOperationView.factory(
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        op='wake_up', icon='sun-o', effect='success')),
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    ('sleep', VmOperationView.factory(
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        extra_bases=[TokenOperationView],
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        op='sleep', icon='moon-o', effect='info')),
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    ('migrate', VmMigrateView),
    ('save_as_template', VmSaveView),
    ('reboot', VmOperationView.factory(
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        op='reboot', icon='refresh', effect='warning')),
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    ('reset', VmOperationView.factory(
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        op='reset', icon='bolt', effect='warning')),
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    ('shutdown', VmOperationView.factory(
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        op='shutdown', icon='power-off', effect='warning')),
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    ('shut_off', VmOperationView.factory(
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        op='shut_off', icon='ban', effect='warning')),
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    ('recover', VmOperationView.factory(
        op='recover', icon='medkit', effect='warning')),
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    ('destroy', VmOperationView.factory(
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        extra_bases=[TokenOperationView],
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        op='destroy', icon='times', effect='danger')),
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    ('create_disk', VmCreateDiskView),
    ('download_disk', VmDownloadDiskView),
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    ('renew', VmRenewView),
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    ('resources_change', VmResourcesChangeView),
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])
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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 PermissionDenied as e:
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            logger.debug('Not showing operation %s for %s: %s',
                         k, instance, unicode(e))
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        except Exception:
            ops.append(v.bind_to_object(instance, disabled=True))
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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'] = (
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            settings.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()
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        context['future_users'] = FutureMember.objects.filter(
            group=self.object)
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        context['acl'] = AclUpdateView.get_acl_data(
            self.object.profile, self.request.user,
            'dashboard.views.group-acl')
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        context['group_profile_form'] = GroupProfileUpdate.get_form_object(
            self.request, self.object.profile)
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        if self.request.user.is_superuser:
            context['group_perm_form'] = GroupPermissionForm(
                instance=self.object)

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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:
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            entity = search_user(name)
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            self.object.user_set.add(entity)
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        except User.DoesNotExist:
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            if saml_available:
                FutureMember.objects.get_or_create(org_id=name,
                                                   group=self.object)
            else:
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                messages.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 GroupPermissionsView(SuperuserRequiredMixin, UpdateView):
    model = Group
    form_class = GroupPermissionForm
    slug_field = "pk"
    slug_url_kwarg = "group_pk"

    def get_success_url(self):
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        return "%s#group-detail-permissions" % (
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            self.get_object().groupprofile.get_absolute_url())


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class AclUpdateView(LoginRequiredMixin, View, SingleObjectMixin):
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    def send_success_message(self, whom, old_level, new_level):
        if old_level and new_level:
            msg = _("Acl user/group %(w)s successfully modified.")
        elif not old_level and new_level:
            msg = _("Acl user/group %(w)s successfully added.")
        elif old_level and not new_level:
            msg = _("Acl user/group %(w)s successfully removed.")
        if msg:
            messages.success(self.request, msg % {'w': whom})

    def get_level(self, whom):
        for u, level in self.acl_data:
            if u == whom:
                return level
        return None
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    @classmethod
    def get_acl_data(cls, obj, user, url):
        levels = obj.ACL_LEVELS
        allowed_levels = list(l[0] for l in obj.ACL_LEVELS
                              if cls.has_next_level(user, obj, l[0]))
        is_owner = 'owner' in allowed_levels

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        allowed_users = cls.get_allowed_users(user)
        allowed_groups = cls.get_allowed_groups(user)
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        user_levels = list(
            {'user': u, 'level': l} for u, l in obj.get_users_with_level()
            if is_owner or u == user or u in allowed_users)

        group_levels = list(
            {'group': g, 'level': l} for g, l in obj.get_groups_with_level()
            if is_owner or g in allowed_groups)

        return {'users': user_levels,
                'groups': group_levels,
                'levels': levels,
                'allowed_levels': allowed_levels,
                'url': reverse(url, args=[obj.pk])}

    @classmethod
    def has_next_level(self, user, instance, level):
        # TODO
        levels = zip(*instance.ACL_LEVELS)[0]
        try:
            i = levels.index(level)
        except ValueError:
            i = 0
        if i < (len(levels) - 1):
            i += 1
        next_level = levels[i]

        return instance.has_level(user, next_level)
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    @classmethod
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    def get_allowed_groups(cls, user):
        if user.has_perm('dashboard.use_autocomplete'):
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            return Group.objects.all()
        else:
            profiles = GroupProfile.get_objects_with_level('owner', user)
            return Group.objects.filter(groupprofile__in=profiles).distinct()

    @classmethod
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    def get_allowed_users(cls, user):
        if user.has_perm('dashboard.use_autocomplete'):
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            return User.objects.all()
        else:
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            groups = cls.get_allowed_groups(user)
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            return User.objects.filter(
                Q(groups__in=groups) | Q(pk=user.pk)).distinct()

    def check_auth(self, whom, old_level, new_level):
        if isinstance(whom, Group):
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            if (not self.is_owner and whom not in
                    AclUpdateView.get_allowed_groups(self.request.user)):
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                return False
        elif isinstance(whom, User):
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            if (not self.is_owner and whom not in
                    AclUpdateView.get_allowed_users(self.request.user)):
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                return False
        return (
            AclUpdateView.has_next_level(self.request.user,
                                         self.instance, new_level) and
            AclUpdateView.has_next_level(self.request.user,
                                         self.instance, old_level))

    def set_level(self, whom, new_level):
        user = self.request.user
        old_level = self.get_level(whom)
        if old_level == new_level:
            return

        if getattr(self.instance, "owner", None) == whom:
            logger.info("Tried to set owner's acl level for %s by %s.",
                        unicode(self.instance), unicode(user))
            msg = _("The original owner cannot be removed, however "
                    "you can transfer ownership.")
            if not getattr(self, 'hide_messages', False):
                messages.warning(self.request, msg)
        elif self.check_auth(whom, old_level, new_level):
            logger.info(
                u"Set %s's acl level for %s to %s by %s.", unicode(whom),
                unicode(self.instance), new_level, unicode(user))
            if not getattr(self, 'hide_messages', False):
                self.send_success_message(whom, old_level, new_level)
            self.instance.set_level(whom, new_level)
        else:
            logger.warning(
                u"Tried to set %s's acl_level for %s (%s->%s) by %s.",
                unicode(whom), unicode(self.instance), old_level, new_level,
                unicode(user))

    def set_or_remove_levels(self):
        for key, value in self.request.POST.items():
            m = re.match('(perm|remove)-([ug])-(\d+)', key)
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            if m:
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                cmd, typ, id = m.groups()
                if cmd == 'remove':
                    value = None
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                entity = {'u': User, 'g': Group}[typ].objects.get(id=id)
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                self.set_level(entity, value)

    def add_levels(self):
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        name = self.request.POST.get('name', None)
        level = self.request.POST.get('level', None)
        if not name or not level:
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            return
        try:
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            entity = search_user(name)
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            if self.instance.object_level_set.filter(users__in=[entity]):
                messages.warning(
                    self.request, _('User "%s" has already '
                                    'access to this object.') % name)
                return
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        except User.DoesNotExist:
            entity = None
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            try:
                entity = Group.objects.get(name=name)
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                if self.instance.object_level_set.filter(groups__in=[entity]):
                    messages.warning(
                        self.request, _('Group "%s" has already '
                                        'access to this object.') % name)
                    return
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            except Group.DoesNotExist:
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                messages.warning(
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                    self.request, _('User or group "%s" not found.') % name)
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                return
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        self.set_level(entity, level)
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    def post(self, request, *args, **kwargs):
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        self.instance = self.get_object()
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        self.is_owner = self.instance.has_level(request.user, 'owner')
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        self.acl_data = (self.instance.get_users_with_level() +