import string import random import requests import logging from django.shortcuts import redirect from django.utils.translation import ugettext_lazy as _ from django.urls import reverse from django.conf import settings as project_settings from .base import BackendBase logger = logging.getLogger(__name__) prng = random.SystemRandom() def generate_token(length=16): charset = string.digits + string.ascii_letters return ''.join([prng.choice(charset) for _ in range(length)]) class CoinGateBackend(BackendBase): backend_id = 'coingate' backend_verbose_name = _("CoinGate") backend_display_name = _("Cryptocurrencies") backend_has_recurring = False def __init__(self, settings): self.api_token = settings.get('api_token') if not self.api_token: return self.currency = settings.get('currency', 'EUR') self.title = settings.get('title', 'VPN Payment') if settings.get('sandbox'): self.sandbox = True self.api_base = "https://api-sandbox.coingate.com" else: self.sandbox = False default_base = "https://api.coingate.com" self.api_base = settings.get('api_base', default_base) self.backend_enabled = True def _post(self, endpoint, **kwargs): headers = { 'Authorization': 'Token ' + self.api_token, } url = self.api_base + endpoint response = requests.post(url, headers=headers, **kwargs) response.raise_for_status() j = response.json() return j def new_payment(self, payment): root_url = project_settings.ROOT_URL assert root_url token = generate_token() order = self._post('/v2/orders', data={ 'order_id': str(payment.id), 'price_amount': payment.amount / 100, 'price_currency': self.currency, 'receive_currency': self.currency, 'title': self.title, 'callback_url': root_url + reverse('payments:cb_coingate', args=(payment.id,)), 'cancel_url': root_url + reverse('payments:cancel', args=(payment.id,)), 'success_url': root_url + reverse('payments:view', args=(payment.id,)), 'token': token, }) url = order['payment_url'] payment.backend_extid = order['id'] payment.backend_data['coingate_id'] = order['id'] payment.backend_data['coingate_url'] = url payment.backend_data['coingate_token'] = token payment.save() return redirect(url) def callback(self, payment, request): post_data = request.POST # Verify callback authenticity saved_token = payment.backend_data.get('coingate_token') if not saved_token: logger.debug("payment does not have a coingate_token") return False token = post_data.get('token') if token != saved_token: logger.debug("unexpected token (%r != %r)", token, saved_token) return False order_id = post_data.get('order_id') if order_id != str(payment.id): logger.debug("unexpected order_id (%r != %r)", order_id, str(payment.id)) return False # Handle event status = post_data.get('status') if status == 'new' or status == 'pending': payment.update_status('new') elif status == 'confirming': payment.update_status('new', _("Confirming transaction")) elif status == 'paid': if payment.status in {'new', 'cancelled', 'error'}: # we don't have the exact converted amount, but it's not # important. settings to the requested amount for consistency payment.paid_amount = payment.amount payment.confirm() elif status == 'invalid' or status == 'expired': if payment.status != 'confirmed': payment.update_status('cancelled') elif status == 'refunded': if payment.status == 'confirmed': payment.refund() else: logger.debug("unexpected payment status: %r", status) return False payment.save() return True def get_ext_url(self, payment): if not payment.backend_extid: return None if self.sandbox: return 'https://sandbox.coingate.com/account/orders/%s' % payment.backend_extid else: return 'https://coingate.com/account/orders/%s' % payment.backend_extid