Synnefo

class UTC(tzinfo):

    def utcoffset(self, dt):

        return timedelta(0)

    def tzname(self, dt):

        return 'UTC'

    def dst(self, dt):

        return timedelta(0)

def isoformat(d):

    """Return an ISO8601 date string that includes a timezone."""

    return d.replace(tzinfo=UTC()).isoformat()

def isoparse(s):

    """Parse an ISO8601 date string into a datetime object."""

    if not s:

        return None

    try:

        since = dateutil.parser.parse(s)

        utc_since = since.astimezone(UTC()).replace(tzinfo=None)

    except ValueError:

        raise faults.BadRequest('Invalid changes-since parameter.')

    now = datetime.datetime.now()

    if utc_since > now:

        raise faults.BadRequest('changes-since value set in the future.')

    if now - utc_since > timedelta(seconds=settings.POLL_LIMIT):

        raise faults.BadRequest('Too old changes-since value.')

    return utc_since

def get_request_dict(request):

    """Returns data sent by the client as a python dict."""

    data = request.raw_post_data

    if request.META.get('CONTENT_TYPE').startswith('application/json'):

        try:

            return json.loads(data)

        except ValueError:

            raise faults.BadRequest('Invalid JSON data.')

    else:

        raise faults.BadRequest('Unsupported Content-Type.')

def update_response_headers(request, response):

    if request.serialization == 'xml':

        response['Content-Type'] = 'application/xml'

    elif request.serialization == 'atom':

        response['Content-Type'] = 'application/atom+xml'

    else:

        response['Content-Type'] = 'application/json'

    if settings.TEST:

        response['Date'] = format_date_time(time())

    add_never_cache_headers(response)

def render_fault(request, fault):

    if settings.DEBUG or settings.TEST:

        fault.details = format_exc(fault)

    if request.serialization == 'xml':

        data = render_to_string('fault.xml', {'fault': fault})

    else:

        d = {fault.name: {'code': fault.code,

                          'message': fault.message,

                          'details': fault.details}}

        data = json.dumps(d)

    resp = HttpResponse(data, status=fault.code)

    update_response_headers(request, resp)

    return resp

def request_serialization(request, atom_allowed=False):

    """Return the serialization format requested.

    Valid formats are 'json', 'xml' and 'atom' if `atom_allowed` is True.

    """

    path = request.path

    if path.endswith('.json'):

        return 'json'

    elif path.endswith('.xml'):

        return 'xml'

    elif atom_allowed and path.endswith('.atom'):

        return 'atom'

    for item in request.META.get('HTTP_ACCEPT', '').split(','):

        accept, sep, rest = item.strip().partition(';')

        if accept == 'application/json':

            return 'json'

        elif accept == 'application/xml':

            return 'xml'

        elif atom_allowed and accept == 'application/atom+xml':

            return 'atom'

    return 'json'

def api_method(http_method=None, atom_allowed=False):

    """Decorator function for views that implement an API method."""

    def decorator(func):

        @wraps(func)

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

            try:

                request.serialization = request_serialization(request,

                                                              atom_allowed)

                get_user(request, settings.ASTAKOS_URL)

                if not request.user_uniq:

                    raise faults.Unauthorized('No user found.')

                if http_method and request.method != http_method:

                    raise faults.BadRequest('Method not allowed.')

                resp = func(request, *args, **kwargs)

                update_response_headers(request, resp)

                return resp

            except faults.Fault, fault:

                if fault.code >= 500:

                    log.exception('API fault')

                return render_fault(request, fault)

            except BaseException:

                log.exception('Unexpected error')

                fault = faults.ServiceUnavailable('Unexpected error.')

                return render_fault(request, fault)

        return wrapper

    return decorator

def get_flavor_provider(flavor):

    """Extract provider from disk template.

    Provider for `ext` disk_template is encoded in the disk template

    name, which is formed `ext_<provider_name>`. Provider is None

    for all other disk templates.

    """

    disk_template = flavor.disk_template

    provider = None

    if disk_template.startswith("ext"):

        disk_template, provider = disk_template.split("_", 1)

    return disk_template, provider