pretixdroid: Completely new API

src/pretix/plugins/pretixdroid/migrations/0001_initial.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-08-30 10:09
+from __future__ import unicode_literals
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('pretixbase', '0033_auto_20160821_2222'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Checkin',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('datetime', models.DateTimeField(auto_now_add=True)),
+                ('position', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='pretixdroid_checkins', to='pretixbase.OrderPosition')),
+            ],
+        ),
+    ]

src/pretix/plugins/pretixdroid/models.py

@@ -0,0 +1,6 @@
+from django.db import models
+
+
+class Checkin(models.Model):
+    position = models.ForeignKey('pretixbase.OrderPosition', related_name='pretixdroid_checkins')
+    datetime = models.DateTimeField(auto_now_add=True)

src/pretix/plugins/pretixdroid/static/pretixplugins/pretixdroid/pretixdroid.js

@@ -1,7 +1,7 @@
 $(function () {
     jQuery('#qrcodeCanvas').qrcode(
         {
-            text: '{{ qrdata|safe }}'
+            text: $("#qrdata").html()
         }
     );
 });

src/pretix/plugins/pretixdroid/templates/pretixplugins/pretixdroid/configuration.html

@@ -10,6 +10,9 @@
         If you try to configure the app, it will ask you to scan the QR code below.
     {% endblocktrans %}</p>
     <div id="qrcodeCanvas"></div>
+    <script type="text/json" id="qrdata">
+        {{ qrdata|safe }}
+    </script>
     <script type="text/javascript" src="{% static "pretixplugins/pretixdroid/pretixdroid.js" %}"></script>
     <a href="?flush_key=1" class="btn btn-default">{% trans "Reset authentication token" %}</a>
 {% endblock %}

src/pretix/plugins/pretixdroid/urls.py

@@ -5,6 +5,6 @@ from . import views
 urlpatterns = [
     url(r'^control/event/(?P<organizer>[^/]+)/(?P<event>[^/]+)/pretixdroid/', views.ConfigView.as_view(),
         name='config'),
-    url(r'^pretixdroid/api/(?P<organizer>[^/]+)/(?P<event>[^/]+)/', views.ApiView.as_view(),
-        name='api'),
+    url(r'^pretixdroid/api/(?P<organizer>[^/]+)/(?P<event>[^/]+)/redeem/', views.ApiRedeemView.as_view(),
+        name='api.redeem'),
 ]

src/pretix/plugins/pretixdroid/views.py

@@ -2,17 +2,22 @@ import json
 import logging
 import string
 
+from django.db import transaction
 from django.http import (
     HttpResponseForbidden, HttpResponseNotFound, JsonResponse,
 )
 from django.utils.crypto import get_random_string
+from django.utils.decorators import method_decorator
+from django.views.decorators.csrf import csrf_exempt
 from django.views.generic import TemplateView, View
 
 from pretix.base.models import Event, Order, OrderPosition
 from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.helpers.urls import build_absolute_uri
+from pretix.plugins.pretixdroid.models import Checkin
 
 logger = logging.getLogger('pretix.plugins.pretixdroid')
+API_VERSION = 2
 
 
 class ConfigView(EventPermissionRequiredMixin, TemplateView):
@@ -23,44 +28,76 @@ class ConfigView(EventPermissionRequiredMixin, TemplateView):
         ctx = super().get_context_data()
         key = self.request.event.settings.get('pretixdroid_key')
         if not key or 'flush_key' in self.request.GET:
-            key = get_random_string(length=32, allowed_chars=string.ascii_uppercase + string.ascii_lowercase + string.digits)
+            key = get_random_string(length=32,
+                                    allowed_chars=string.ascii_uppercase + string.ascii_lowercase + string.digits)
             self.request.event.settings.set('pretixdroid_key', key)
 
         ctx['qrdata'] = json.dumps({
-            'version': 1,
-            'url': build_absolute_uri('plugins:pretixdroid:api', kwargs={
+            'version': API_VERSION,
+            'url': build_absolute_uri('plugins:pretixdroid:api.redeem', kwargs={
                 'organizer': self.request.event.organizer.slug,
                 'event': self.request.event.slug
-            }),
+            })[:-7],  # the slice removes the redeem/ part at the end
             'key': key
         })
         return ctx
 
 
 class ApiView(View):
-    def get(self, request, **kwargs):
+
+    @method_decorator(csrf_exempt)
+    def dispatch(self, request, **kwargs):
         try:
-            event = Event.objects.get(
+            self.event = Event.objects.get(
                 slug=self.kwargs['event'],
                 organizer__slug=self.kwargs['organizer']
             )
         except Event.DoesNotExist:
             return HttpResponseNotFound('Unknown event')
 
-        if (not event.settings.get('pretixdroid_key')
-                or event.settings.get('pretixdroid_key') != request.GET.get('key', '')):
+        if (not self.event.settings.get('pretixdroid_key')
+                or self.event.settings.get('pretixdroid_key') != request.GET.get('key', '')):
             return HttpResponseForbidden('Invalid key')
 
-        ops = OrderPosition.objects.filter(
-            order__event=event, order__status=Order.STATUS_PAID,
-        ).select_related('item', 'variation')
-        data = [
-            {
+        return super().dispatch(request, **kwargs)
+
+
+class ApiRedeemView(ApiView):
+    def post(self, request, **kwargs):
+        secret = request.POST.get('secret', '!INVALID!')
+        response = {
+            'version': API_VERSION
+        }
+
+        try:
+            with transaction.atomic():
+                created = False
+                op = OrderPosition.objects.select_related('item', 'variation', 'order').get(
+                    order__event=self.event, secret=secret
+                )
+                if op.order.status == Order.STATUS_PAID:
+                    ci, created = Checkin.objects.get_or_create(position=op)
+                else:
+                    response['status'] = 'error'
+                    response['reason'] = 'unpaid'
+
+            if 'status' not in response:
+                if created:
+                    response['status'] = 'ok'
+                else:
+                    response['status'] = 'error'
+                    response['reason'] = 'already_redeemed'
+
+            response['data'] = {
                 'secret': op.secret,
+                'order': op.order.code,
                 'item': str(op.item),
                 'variation': str(op.variation) if op.variation else None,
                 'attendee_name': op.attendee_name
             }
-            for op in ops
-        ]
-        return JsonResponse({'data': data, 'version': 1})
+
+        except OrderPosition.DoesNotExist:
+            response['status'] = 'error'
+            response['reason'] = 'unknown_ticket'
+
+        return JsonResponse(response)