Useful wrappers for django views

wrappers.py

def login_required(function):
    """filter views"""
    @wraps(function)
    def wrapper(*args, **kwargs):
        request = args[0]
        user = None
        if not request.user.is_authenticated:
            if request.method == 'POST':
                try:
                    username = request.POST['username']
                    password = request.POST['password']
                    user = authenticate(username=username, password=password)
                    print(user)
                    if not user is None and not request.user.is_authenticated:
                        login(request,user)
                        return HttpResponseRedirect(request.path)
                except:
                    return HttpResponseBadRequest()
            else:
                return render(request, "signin.html")
        if "logout" in request.GET:
            logout_user(request)
            return render(request, "signin.html")
        return function(*args, **kwargs)
    return wrapper

def parametrized(dec):
    def layer(*args, **kwargs):
        def repl(f):
            return dec(f, *args, **kwargs)
        return repl
    return layer
@parametrized
def restrict(function, *groups):
    """restrict views to specific user groups, use after login_required wrapper"""
    @wraps(function)
    def wrapper(*args, **kwargs):
        request = args[0]
        user_groups = map(lambda group: group.name,request.user.groups.all())
        for group in groups:
            if group in user_groups:    
                return function(*args, **kwargs)
        return HttpResponseNotAllowed()
    return wrapper