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from django.http import HttpResponse, HttpResponseRedirect, HttpResponseForbidden
from django.db import transaction
from django.shortcuts import render, get_object_or_404
from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.views.decorators.csrf import csrf_exempt
import base64
from postgresqleu.util.decorators import global_login_exempt
from postgresqleu.util.payment.adyen import calculate_signature
from postgresqleu.util.payment.adyen import AdyenBanktransfer
from postgresqleu.invoices.models import Invoice
from postgresqleu.invoices.util import InvoiceManager
from models import RawNotification, AdyenLog, ReturnAuthorizationStatus
from util import process_raw_adyen_notification
@transaction.atomic
def adyen_return_handler(request):
sig = calculate_signature(request.GET)
if sig != request.GET['merchantSig']:
return render(request, 'adyen/sigerror.html')
# We're going to need the invoice for pretty much everything,
# so attempt to find it.
if request.GET['merchantReturnData'] != request.GET['merchantReference'] or not request.GET['merchantReturnData'].startswith(settings.ADYEN_MERCHANTREF_PREFIX):
AdyenLog(pspReference='', message='Return handler received invalid reference %s/%s' % (request.GET['merchantReturnData'], request.GET['merchantReference']), error=True).save()
return render(request, 'adyen/invalidreference.html', {
'reference': "%s//%s" % (request.GET['merchantReturnData'], request.GET['merchantReference']),
})
invoiceid = int(request.GET['merchantReturnData'][len(settings.ADYEN_MERCHANTREF_PREFIX):])
try:
invoice = Invoice.objects.get(pk=invoiceid)
except Invoice.DoesNotExist:
AdyenLog(pspReference='', message='Return handler could not find invoice for reference %s' % request.GET['merchantReturnData'], error=True).save()
return render(request, 'adyen/invalidreference.html', {
'reference': request.GET['merchantReturnData'],
})
manager = InvoiceManager()
if invoice.processor:
processor = manager.get_invoice_processor(invoice)
returnurl = processor.get_return_url(invoice)
else:
if invoice.recipient_user:
returnurl = "%s/invoices/%s/" % (settings.SITEBASE, invoice.pk)
else:
returnurl = "%s/invoices/%s/%s/" % (settings.SITEBASE, invoice.pk, invoice.recipient_secret)
AdyenLog(pspReference='', message='Return handler received %s result for %s' % (request.GET['authResult'], request.GET['merchantReturnData']), error=False).save()
if request.GET['authResult'] == 'REFUSED':
return render(request, 'adyen/refused.html', {
'url': returnurl,
})
elif request.GET['authResult'] == 'CANCELLED':
return HttpResponseRedirect(returnurl)
elif request.GET['authResult'] == 'ERROR':
return render(request, 'adyen/transerror.html', {
'url': returnurl,
})
elif request.GET['authResult'] == 'PENDING':
return render(request, 'adyen/pending.html', {
'url': returnurl,
})
elif request.GET['authResult'] == 'AUTHORISED':
# NOTE! Adyen strongly recommends not reacting on
# authorized values, but deal with them from the
# notifications instead. So we'll do that.
# However, if we reach this point and it's actually
# already dealt with by the notification arriving
# asynchronously, redirect the user properly.
if invoice.paidat:
# Yup, it's paid, so send the user off to the page
# that they came from.
return HttpResponseRedirect(returnurl)
# Show the user a pending message. The refresh time is dependent
# on how many times we've seen this one before.
status, created = ReturnAuthorizationStatus.objects.get_or_create(pspReference=request.GET['pspReference'])
status.seencount += 1
status.save()
return render(request, 'adyen/authorized.html', {
'refresh': 3**status.seencount,
'url': returnurl,
})
else:
return render(request, 'adyen/invalidresult.html', {
'result': request.GET['authResult'],
})
@global_login_exempt
@csrf_exempt
def adyen_notify_handler(request):
# Handle asynchronous notifications from the Adyen payment platform
# Authenticate with HTTP BASIC
if not 'HTTP_AUTHORIZATION' in request.META:
# Sometimes Adyen sends notifications without authorization headers.
# In this case, we request authrorization and they will try again
r = HttpResponse('Unauthorized', status=401)
r['WWW-Authenticate'] = 'Basic realm="postgresqleu adyen"'
return r
auth = request.META['HTTP_AUTHORIZATION'].split()
if len(auth) != 2:
raise Exception('Adyen notification received with invalid length authentication')
if auth[0].lower() != 'basic':
raise Exception('Adyen notification received with invalid authentication type')
user, pwd = base64.b64decode(auth[1]).split(':')
if user != settings.ADYEN_NOTIFY_USER or pwd != settings.ADYEN_NOTIFY_PASSWORD:
return HttpResponseForbidden('Invalid username or password')
# Ok, we have authentication. All our data is now available in
# request.POST
# Store the raw notification at this point, so we have it around in
# case something breaks in a way we couldn't handle
raw = RawNotification(contents=request.body)
raw.save()
if process_raw_adyen_notification(raw, request.POST):
return HttpResponse('[accepted]', content_type='text/plain')
else:
return HttpResponse('[internal error]', content_type='text/plain')
# Rendered views to do bank payment
def _invoice_payment(request, invoice):
method = AdyenBanktransfer()
paymenturl = method.build_adyen_payment_url(invoice.invoicestr, invoice.total_amount, invoice.pk)
return render(request, 'adyen/adyen_bank_payment.html', {
'available': method.available(invoice),
'unavailable_reason': method.unavailable_reason(invoice),
'paymenturl': paymenturl,
})
@login_required
def invoicepayment(request, invoiceid):
invoice = get_object_or_404(Invoice, pk=invoiceid, deleted=False, finalized=True)
if not (request.user.has_module_perms('invoices') or invoice.recipient_user == request.user):
return HttpResponseForbidden("Access denied")
return _invoice_payment(request, invoice)
def invoicepayment_secret(request, invoiceid, secret):
invoice = get_object_or_404(Invoice, pk=invoiceid, deleted=False, finalized=True, recipient_secret=secret)
return _invoice_payment(request, invoice)
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