re2o/cotisations/payment_methods/comnpay/models.py

# -*- mode: python; coding: utf-8 -*-
# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2018  Hugo Levy-Falk
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
from django.db import models
from django.shortcuts import render
from django.urls import reverse
from django.utils.translation import ugettext_lazy as _

from cotisations.models import Paiement
from cotisations.payment_methods.mixins import PaymentMethodMixin

from re2o.aes_field import AESEncryptedField
from .comnpay import Transaction


class ComnpayPayment(PaymentMethodMixin, models.Model):
    """
    The model allowing you to pay with COMNPAY.
    """

    class Meta:
        verbose_name = _("ComNpay")

    payment = models.OneToOneField(
        Paiement,
        on_delete=models.CASCADE,
        related_name="payment_method_comnpay",
        editable=False,
    )
    payment_credential = models.CharField(
        max_length=255, default="", blank=True, verbose_name=_("ComNpay VAT Number")
    )
    payment_pass = AESEncryptedField(
        max_length=255, null=True, blank=True, verbose_name=_("ComNpay secret key")
    )
    minimum_payment = models.DecimalField(
        verbose_name=_("minimum payment"),
        help_text=_(
            "The minimal amount of money you have to use when paying with"
            " ComNpay."
        ),
        max_digits=5,
        decimal_places=2,
        default=1,
    )
    production = models.BooleanField(
        default=True,
        verbose_name=_(
            "production mode enabled (production URL, instead of homologation)"
        ),
    )

    def return_url_comnpay(self):
        if self.production:
            return "https://secure.comnpay.com"
        else:
            return "https://secure.homologation.comnpay.com"

    def end_payment(self, invoice, request):
        """
        Build a request to start the negociation with Comnpay by using
        a facture id, the price and the secret transaction data stored in
        the preferences.
        """
        host = request.get_host()
        p = Transaction(
            str(self.payment_credential),
            str(self.payment_pass),
            "https://"
            + host
            + reverse(
                "cotisations:comnpay:accept_payment", kwargs={"factureid": invoice.id}
            ),
            "https://" + host + reverse("cotisations:comnpay:refuse_payment"),
            "https://" + host + reverse("cotisations:comnpay:ipn"),
            "",
            "D",
        )

        r = {
            "action": self.return_url_comnpay(),
            "method": "POST",
            "content": p.buildSecretHTML(
                _("Pay invoice number ") + str(invoice.id),
                invoice.prix_total(),
                idTransaction=str(invoice.id),
            ),
            "amount": invoice.prix_total(),
        }
        return render(request, "cotisations/payment.html", r)

    def check_price(self, price, *args, **kwargs):
        """Checks that the price meets the requirement to be paid with ComNpay.
        """
        return (
            (price >= self.minimum_payment),
            _(
                "In order to pay your invoice with ComNpay, the price must"
                " be greater than {} €."
            ).format(self.minimum_payment),
        )