PayPal: Migrate to Order v2 API and ISU authentication (#2493) (#2614)

Co-authored-by: Raphael Michel <michel@rami.io>
Co-authored-by: Martin Gross <gross@rami.io>

src/pretix/plugins/paypal/migrations/0003_migrate_to_v2.py

@@ -0,0 +1,52 @@
+# Generated by Django 3.2.13 on 2022-05-25 08:39
+
+from django.db import migrations
+from django.db.models import Q
+
+
+def migrate_to_v2(app, schema_editor):
+    GlobalSettingsObject_SettingsStore = app.get_model('pretixbase', 'GlobalSettingsObject_SettingsStore')
+    EventSettingsStore = app.get_model('pretixbase', 'Event_SettingsStore')
+    Event = app.get_model('pretixbase', 'Event')
+
+    # If there are no system-wide OAuth keys set, per-event API keys are used, and we can migrate all events
+    if not GlobalSettingsObject_SettingsStore.objects.filter(
+            Q(key__in=['payment_paypal_connect_client_id', 'payment_paypal_connect_secret_key'])
+            & (Q(value__isnull=True) | ~Q(value=""))
+    ).exists():
+        for ev in Event.objects.filter(plugins__contains='pretix.plugins.paypal'):
+            switch_paypal_version(ev)
+
+    # There are system-wide OAuth keys set - so we need to check each event individually
+    else:
+        # Only look at events that have the PayPal plugin enabled
+        for ev in Event.objects.filter(plugins__contains='pretix.plugins.paypal'):
+            # If the payment method is enabled, we don't do anything
+            if EventSettingsStore.objects.filter(object_id=ev.pk, key='payment_paypal__enabled', value="True").exists():
+                pass
+            # In all other cases, the payment method is either disabled or hasn't been set up - in this case we'll
+            # migrate the event to v2
+            else:
+                switch_paypal_version(ev)
+
+
+def switch_paypal_version(event):
+    plugins_active = event.plugins.split(',')
+
+    if 'pretix.plugins.paypal' in plugins_active:
+        plugins_active.remove('pretix.plugins.paypal')
+        plugins_active.append('pretix.plugins.paypal2')
+
+        event.plugins = ','.join(plugins_active)
+        event.save(update_fields=['plugins'])
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('paypal', '0002_referencedpaypalobject_payment'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_to_v2, migrations.RunPython.noop)
+    ]