Synnefo

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

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import re

import logging

from django.shortcuts import redirect

from django.views.generic.simple import direct_to_template

from django.conf import settings

from django.core.exceptions import PermissionDenied

from django.http import Http404, HttpResponseRedirect

from django.core.urlresolvers import reverse

from urllib import unquote

from snf_django.lib.astakos import get_user

from synnefo.db.models import VirtualMachine, NetworkInterface, Network

from astakosclient import AstakosClient

# server actions specific imports

from synnefo.api import servers

from synnefo.logic import backend as servers_backend

logger = logging.getLogger(__name__)

IP_SEARCH_REGEX = re.compile('([0-9]+)(?:\.[0-9]+){3}')

UUID_SEARCH_REGEX = re.compile('([0-9a-z]{8}-([0-9a-z]{4}-){3}[0-9a-z]{12})')

VM_SEARCH_REGEX = re.compile('vm(-){0,}(?P<vmid>[0-9]+)')

def get_token_from_cookie(request, cookiename):

    """

    Extract token from the cookie name provided. Cookie should be in the same

    form as astakos service sets its cookie contents::

        <user_uniq>|<user_token>

    """

    try:

        cookie_content = unquote(request.COOKIES.get(cookiename, None))

        return cookie_content.split("|")[1]

    except AttributeError:

        pass

    return None

AUTH_COOKIE_NAME = getattr(settings, 'HELPDESK_AUTH_COOKIE_NAME',

                           getattr(settings, 'UI_AUTH_COOKIE_NAME',

                                   '_pithos2_a'))

PERMITTED_GROUPS = getattr(settings, 'HELPDESK_PERMITTED_GROUPS', ['helpdesk'])

SHOW_DELETED_VMS = getattr(settings, 'HELPDESK_SHOW_DELETED_VMS', False)

def token_check(func):

    """

    Mimic csrf security check using user auth token.

    """

    def wrapper(request, *args, **kwargs):

        if not hasattr(request, 'user'):

            raise PermissionDenied

        token = request.POST.get('token', None)

        if token and token == request.user.get('auth_token', None):

            return func(request, *args, **kwargs)

        raise PermissionDenied

    return wrapper

def helpdesk_user_required(func, permitted_groups=PERMITTED_GROUPS):

    """

    Django view wrapper that checks if identified request user has helpdesk

    permissions (exists in helpdesk group)

    """

    def wrapper(request, *args, **kwargs):

        HELPDESK_ENABLED = getattr(settings, 'HELPDESK_ENABLED', True)

        if not HELPDESK_ENABLED:

            raise Http404

        token = get_token_from_cookie(request, AUTH_COOKIE_NAME)

        get_user(request, settings.ASTAKOS_URL,

                 fallback_token=token, logger=logger)

        if hasattr(request, 'user') and request.user:

            groups = request.user.get('groups', [])

            if not groups:

                logger.error("Failed to access helpdesk view %r",

                             request.user_uniq)

                raise PermissionDenied

            has_perm = False

            for g in groups:

                if g in permitted_groups:

                    has_perm = True

            if not has_perm:

                logger.error("Failed to access helpdesk view %r. No valid "

                             "helpdesk group (%r) matches user groups (%r)",

                             request.user_uniq, permitted_groups, groups)

                raise PermissionDenied

        else:

            logger.error("Failed to access helpdesk view %r. No authenticated "

                         "user found.")

            raise PermissionDenied

        logging.info("User %s accessed helpdesk view (%s)", request.user_uniq,

                     request.path)

        return func(request, *args, **kwargs)

    return wrapper

@helpdesk_user_required

def index(request):

    """

    Helpdesk index view.

    """

    # if form submitted redirect to details

    account = request.GET.get('account', None)

    if account:

        return redirect('synnefo.helpdesk.views.account',

                        search_query=account)

    # show index template

    return direct_to_template(request, "helpdesk/index.html")

@helpdesk_user_required

def account(request, search_query):

    """

    Account details view.

    """

    logging.info("Helpdesk search by %s: %s", request.user_uniq, search_query)

    show_deleted = bool(int(request.GET.get('deleted', SHOW_DELETED_VMS)))

    account_exists = True

    vms = []

    networks = []

    is_ip = IP_SEARCH_REGEX.match(search_query)

    is_uuid = UUID_SEARCH_REGEX.match(search_query)

    is_vm = VM_SEARCH_REGEX.match(search_query)

    account_name = search_query

    auth_token = request.user.get('auth_token')

    if is_ip:

        try:

            nic = NetworkInterface.objects.get(ipv4=search_query)

            search_query = nic.machine.userid

            is_uuid = True

        except NetworkInterface.DoesNotExist:

            account_exists = False

            account = None

    if is_vm:

        vmid = is_vm.groupdict().get('vmid')

        try:

            vm = VirtualMachine.objects.get(pk=int(vmid))

            search_query = vm.userid

            is_uuid = True

        except VirtualMachine.DoesNotExist:

            account_exists = False

            account = None

            search_query = vmid

    astakos = AstakosClient(settings.ASTAKOS_URL, retry=2,

                            use_pool=True, logger=logger)

    if is_uuid:

        account = search_query

        account_name = astakos.get_username(auth_token, account)

    if account_exists and not is_uuid:

        account_name = search_query

        account = astakos.get_uuid(auth_token, account_name)

    if not account:

        account_exists = False

    filter_extra = {}

    if not show_deleted:

        filter_extra['deleted'] = False

    # all user vms

    vms = VirtualMachine.objects.filter(userid=account,

                                        **filter_extra).order_by('deleted')

    # return all user private and public networks

    public_networks = Network.objects.filter(public=True,

                                             nics__machine__userid=account,

                                             **filter_extra

                                             ).order_by('state').distinct()

    private_networks = Network.objects.filter(userid=account,

                                              **filter_extra).order_by('state')

    networks = list(public_networks) + list(private_networks)

    if vms.count() == 0 and private_networks.count() == 0:

        account_exists = False

    user_context = {

        'account_exists': account_exists,

        'is_ip': is_ip,

        'is_vm': is_vm,

        'is_uuid': is_uuid,

        'account': account,

        'search_query': search_query,

        'vms': vms,

        'show_deleted': show_deleted,

        'account_name': account_name,

        'token': request.user['auth_token'],

        'networks': networks,

        'UI_MEDIA_URL': settings.UI_MEDIA_URL

    }

    return direct_to_template(request, "helpdesk/account.html",

                              extra_context=user_context)

@helpdesk_user_required

@token_check

def vm_suspend(request, vm_id):

    vm = VirtualMachine.objects.get(pk=vm_id)

    vm.suspended = True

    vm.save()

    logging.info("VM %s suspended by %s", vm_id, request.user_uniq)

    account = vm.userid

    return HttpResponseRedirect(reverse('helpdesk-details', args=(account,)))

@helpdesk_user_required

@token_check

def vm_suspend_release(request, vm_id):

    vm = VirtualMachine.objects.get(pk=vm_id)

    vm.suspended = False

    vm.save()

    logging.info("VM %s unsuspended by %s", vm_id, request.user_uniq)

    account = vm.userid

    return HttpResponseRedirect(reverse('helpdesk-details', args=(account,)))

@helpdesk_user_required

@token_check

def vm_shutdown(request, vm_id):

    logging.info("VM %s shutdown by %s", vm_id, request.user_uniq)

    vm = VirtualMachine.objects.get(pk=vm_id)

    servers.start_action(vm, 'STOP')

    servers_backend.shutdown_instance(vm)

    account = vm.userid

    return HttpResponseRedirect(reverse('helpdesk-details', args=(account,)))

@helpdesk_user_required

@token_check

def vm_start(request, vm_id):

    logging.info("VM %s start by %s", vm_id, request.user_uniq)

    vm = VirtualMachine.objects.get(pk=vm_id)

    servers.start_action(vm, 'START')

    servers_backend.startup_instance(vm)

    account = vm.userid

    return HttpResponseRedirect(reverse('helpdesk-details', args=(account,)))