from functools import wraps

def basic_auth_required(func):
@wraps(func)
def _decorator(request, *args, **kwargs):
    from django.conf import settings
    from django.core.exceptions import PermissionDenied
    from django.http import HttpResponse
    from newjazzwebservice import NewJazzConnector
    import base64, binascii
    HTTP_HEADER_ENCODING = 'iso-8859-1'
    if request.META.has_key('HTTP_AUTHORIZATION'):
        auth = request.META['HTTP_AUTHORIZATION'].split()
        if not auth or auth[0].lower() != b'basic':
            return None

        if len(auth) == 1:
            # 'Invalid basic header. No credentials provided.'
            raise PermissionDenied
        elif len(auth) > 2:
            # 'Invalid basic header. Credentials string should not contain spaces.'
            raise PermissionDenied

        try:
            auth_parts = base64.b64decode(auth[1]).decode(HTTP_HEADER_ENCODING).partition(':')
        except (TypeError, UnicodeDecodeError, binascii.Error):
            # 'Invalid basic header. Credentials not correctly base64 encoded.'
            raise PermissionDenied

        userid, password = auth_parts[0], auth_parts[2]

        nwjz = NewJazzConnector(userid, password, settings.ENTORNO_NJ)
        valid_user = nwjz.authenticate()

        if valid_user:
            return func(request, *args, **kwargs)
        else:
            return PermissionDenied
    res = HttpResponse()
    res.status_code = 401
    res['WWW-Authenticate'] = 'Basic'
    return res
return _decorator