from django import template
from django.conf import settings
from django.template.defaultfilters import stringfilter


register = template.Library()


# used to render honeypot field
@register.inclusion_tag('common/snippets/honeypot_field.html')
def render_honeypot_field(field_name=None):
    """
        Renders honeypot field named field_name (defaults to HONEYPOT_FIELD_NAME).
    """
    if not field_name:
        field_name = getattr(settings, 'HONEYPOT_FIELD_NAME', 'name1')
    value = getattr(settings, 'HONEYPOT_VALUE', '')
    if callable(value):
        value = value()
    return {'fieldname': field_name, 'value': value}

div class="form-control" style="display: none;">
        label>input type="text" name="{{ fieldname }}" value="{{ value }}" />
    /label>
/div>

{% load common_tags_filters %}
{% load static %}

form method="post" action="">
     {% csrf_token %}
    {% render_honeypot_field %}
    {% form.as_p %}
/form>

from functools import wraps
from django.conf import settings
from django.http import HttpResponseBadRequest, HttpResponseForbidden, HttpResponseRedirect
from django.template.loader import render_to_string
from django.contrib.auth.decorators import user_passes_test


def honeypot_equals(val):
    """
        Default verifier used if HONEYPOT_VERIFIER is not specified.
        Ensures val == HONEYPOT_VALUE or HONEYPOT_VALUE() if it's a callable.
    """
    expected = getattr(settings, 'HONEYPOT_VALUE', '')
    if callable(expected):
        expected = expected()
    return val == expected


def verify_honeypot_value(request, field_name):
    """
        Verify that request.POST[field_name] is a valid honeypot.
        Ensures that the field exists and passes verification according to
        HONEYPOT_VERIFIER.
    """
    verifier = getattr(settings, 'HONEYPOT_VERIFIER', honeypot_equals)
    if request.method == 'POST':
        field = field_name or settings.HONEYPOT_FIELD_NAME
        if field not in request.POST or not verifier(request.POST[field]):
            response = render_to_string('common/snippets/honeypot_error.html',
                                    {'fieldname': field})
            return HttpResponseBadRequest(response)


def check_honeypot(func=None, field_name=None):
    """
        Check request.POST for valid honeypot field.
        Takes an optional field_name that defaults to HONEYPOT_FIELD_NAME if
        not specified.
    """
    # hack to reverse arguments if called with str param
    if isinstance(func, str):
        func, field_name = field_name, func

    def wrapper(func):
        @wraps(func)
        def inner(request, *args, **kwargs):
            response = verify_honeypot_value(request, field_name)
            if response:
                return response
            else:
                return func(request, *args, **kwargs)
        return inner

    if func is None:
        def decorator(func):
            return wrapper(func)
        return decorator

    return wrapper(func)


def honeypot_exempt(func):
    """
        Mark view as exempt from honeypot validation
    """
    # borrowing liberally from django's csrf_exempt
    @wraps(func)
    def wrapper(*args, **kwargs):
        return func(*args, **kwargs)
    wrapper.honeypot_exempt = True
    return wrapper

!DOCTYPE html>
html lang="en">
    body>
    h1>400 Bad POST Request/h1>
    p>We have detected a suspicious request. Your request is aborted./p>
    /body>
/html>

from common.decorators import check_honeypot


@check_honeypot
def signup(request):
    if request.method == "POST":
        form = SignUpForm(request.POST)
        if form.is_valid():
            user = form.save()
            login(request, user）
            return HttpResponseRedirect(reverse('users:profile'))
    else:
        form = SignUpForm()

    return render(request, "users/signup.html", {"form": form, })