src/club/payment_methods.py

   1 # This file is part of Wolne Lektury, licensed under GNU Affero GPLv3 or later.
   2 # Copyright © Fundacja Wolne Lektury. See NOTICE for more information.
   3 #
   4 from hashlib import sha256
   5 from django.conf import settings
   6 from django.urls import reverse
   7 from django.utils.timezone import now
   8 from django.utils.translation import get_language
   9 from paypal.rest import agreement_approval_url
  10 from django.template.loader import render_to_string
  11 from .payu import POSS
  12
  13
  14 class PaymentMethod(object):
  15     is_onetime = False
  16     is_recurring = False
  17     expiration_reliable = False
  18     cancellable = False
  19     updateable = False
  20
  21     def initiate(self, request, schedule):
  22         raise NotImplementedError
  23
  24
  25 class PayU(PaymentMethod):
  26     is_onetime = True
  27     expiration_reliable = True
  28     slug = 'payu'
  29     name = 'PayU'
  30
  31     def __init__(self, pos_id):
  32         self.pos_id = pos_id
  33
  34     def invite_widget(self, schedule, request):
  35         return render_to_string(
  36             'club/payment/payu_invite.html',
  37             {
  38                 'schedule': schedule,
  39             },
  40             request=request
  41         )
  42
  43     def initiate(self, request, schedule):
  44         # Create Order at once.
  45         from .models import PayUOrder
  46         order = PayUOrder.objects.create(
  47             pos_id=self.pos_id,
  48             customer_ip=request.META['REMOTE_ADDR'],
  49             schedule=schedule,
  50         )
  51         return order.put()
  52
  53
  54 class PayURe(PaymentMethod):
  55     slug = 'payu-re'
  56     name = 'PayU recurring'
  57     is_recurring = True
  58     expiration_reliable = True
  59     cancellable = True
  60     updateable = True
  61
  62     def __init__(self, pos_id):
  63         self.pos_id = pos_id
  64
  65     def initiate(self, request, schedule):
  66         return reverse('club_payu_rec_payment', args=[schedule.key])
  67
  68     def invite_widget(self, schedule, request):
  69         from . import forms
  70         pos = POSS[self.pos_id]
  71         widget_args = {
  72             'merchant-pos-id': pos.pos_id,
  73             'shop-name': "SHOW NAME",
  74             'total-amount': str(int(schedule.amount * 100)),
  75             'currency-code': pos.currency_code,
  76             'customer-language': get_language(), # filter to pos.languages
  77             'customer-email': schedule.email,
  78             'store-card': 'true',
  79             'recurring-payment': 'true',
  80         }
  81         widget_sig = sha256(
  82             (
  83                 "".join(v for (k, v) in sorted(widget_args.items())) +
  84                 pos.secondary_key
  85             ).encode('utf-8')
  86         ).hexdigest()
  87
  88         return render_to_string(
  89             'payu/rec_widget.html',
  90             {
  91                 'schedule': schedule,
  92                 'form': forms.PayUCardTokenForm(),
  93                 'pos': POSS[self.pos_id],
  94                 'widget_args': widget_args,
  95                 'widget_sig': widget_sig,
  96             },
  97             request=request
  98         )
  99
 100     def pay(self, request, schedule):
 101         # Create order, put it and see what happens next.
 102         from .models import PayUOrder
 103         if request is not None:
 104             ip = request.META['REMOTE_ADDR']
 105         else:
 106             ip = '127.0.0.1'
 107
 108         if request is None:
 109             if not self.needs_retry(schedule):
 110                 return
 111
 112         order = PayUOrder.objects.create(
 113             pos_id=self.pos_id,
 114             customer_ip=ip,
 115             schedule=schedule,
 116         )
 117         return order.put()
 118
 119     def needs_retry(self, schedule):
 120         retry_last = schedule.payuorder_set.exclude(
 121             created_at=None).order_by('-created_at').first()
 122         if retry_last is None:
 123             return True
 124
 125         n = now().date()
 126         days_since_last = (n - retry_last.created_at.date()).days
 127
 128         retry_start = max(
 129             schedule.expires_at.date(),
 130             settings.CLUB_RETRIES_START
 131         )
 132         retry_days = (n - retry_start).days
 133
 134         if retry_days > settings.CLUB_RETRY_DAYS_MAX:
 135             print('expired')
 136             return False
 137         if retry_days > settings.CLUB_RETRY_DAYS_DAILY:
 138             print('retry less often now')
 139             return days_since_last > settings.CLUB_RETRY_LESS
 140         return days_since_last > 0
 141
 142
 143 class PayPal(PaymentMethod):
 144     slug = 'paypal'
 145     name = 'PayPal'
 146     is_recurring = True
 147     is_onetime = False
 148
 149     def invite_widget(self, schedule, request):
 150         if settings.PAYPAL_ENABLED:
 151             return render_to_string(
 152                 'club/payment/paypal_invite.html',
 153                 {
 154                     'schedule': schedule,
 155                 },
 156                 request=request
 157             )
 158         else:
 159             return ''
 160
 161     def initiate(self, request, schedule):
 162         app = request.GET.get('app')
 163         return agreement_approval_url(schedule.amount, schedule.key, app=app)
 164
 165     def pay(self, request, schedule):
 166         from datetime import date, timedelta, datetime, timezone
 167         tomorrow = datetime(*(date.today() + timedelta(2)).timetuple()[:3], tzinfo=timezone.utc)
 168         any_active = False
 169         for ba in schedule.billingagreement_set.all():
 170             active = ba.check_agreement()
 171             ba.active = active
 172             ba.save()
 173             if active:
 174                 any_active = True
 175         if any_active:
 176             schedule.expires_at = tomorrow
 177             schedule.save()
 178
 179
 180 methods = []
 181
 182 pos = getattr(settings, 'CLUB_PAYU_RECURRING_POS', None)
 183 if pos:
 184     recurring_payment_method = PayURe(pos)
 185     methods.append(recurring_payment_method)
 186 else:
 187     recurring_payment_method = None
 188
 189 pos = getattr(settings, 'CLUB_PAYU_POS', None)
 190 if pos:
 191     single_payment_method = PayU(pos)
 192     methods.append(single_payment_method)
 193 else:
 194     single_payment_method = None
 195
 196
 197
 198 methods.append(
 199     PayPal()
 200 )