Fix #32 -- Add a PayPal webhook listener

src/pretix/plugins/paypal/signals.py

@@ -1,9 +1,48 @@
-from django.dispatch import receiver
+import json
 
-from pretix.base.signals import register_payment_providers
+from django.dispatch import receiver
+from django.template.loader import get_template
+from django.utils.translation import ugettext_lazy as _
+
+from pretix.base.signals import (
+    logentry_display, register_payment_providers, requiredaction_display,
+)
 
 
 @receiver(register_payment_providers, dispatch_uid="payment_paypal")
 def register_payment_provider(sender, **kwargs):
     from .payment import Paypal
     return Paypal
+
+
+@receiver(signal=logentry_display, dispatch_uid="paypal_logentry_display")
+def pretixcontrol_logentry_display(sender, logentry, **kwargs):
+    if logentry.action_type != 'pretix.plugins.paypal.event':
+        return
+
+    data = json.loads(logentry.data)
+    event_type = data.get('event_type')
+    text = None
+    plains = {
+        'PAYMENT.SALE.COMPLETED': _('Payment completed.'),
+        'PAYMENT.SALE.DENIED': _('Payment denied.'),
+        'PAYMENT.SALE.REFUNDED': _('Payment refunded.'),
+        'PAYMENT.SALE.REVERSED': _('Payment reversed.'),
+    }
+
+    if event_type in plains:
+        text = plains[event_type]
+
+    if text:
+        return _('PayPal reported an event: {}').format(text)
+
+
+@receiver(signal=requiredaction_display, dispatch_uid="paypal_requiredaction_display")
+def pretixcontrol_action_display(sender, action, request, **kwargs):
+    if action.action_type != 'pretix.plugins.paypal.refund':
+        return
+
+    data = json.loads(action.data)
+    template = get_template('pretixplugins/paypal/action_refund.html')
+    ctx = {'data': data, 'event': sender, 'action': action}
+    return template.render(ctx, request)