Fix #1416 -- Add canonical geodata field (#1458)

* Fix #1416 -- Add canonical geodata field for events and subevents

* Add optional geocoding through OpenCageData

* Fix markup everywhere

* Add Leaflet map to geo coordinates

* Fix tests, add credits

* Fix spelling

src/pretix/control/views/geo.py

@@ -0,0 +1,59 @@
+import logging
+from urllib.parse import quote
+
+import requests
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.core.cache import cache
+from django.http import JsonResponse
+from django.views.generic.base import View
+
+from pretix.base.settings import GlobalSettingsObject
+
+logger = logging.getLogger(__name__)
+
+
+class GeoCodeView(LoginRequiredMixin, View):
+    def get(self, request, *args, **kwargs):
+        gs = GlobalSettingsObject()
+        if not gs.settings.opencagedata_apikey:
+            return JsonResponse({
+                'success': False,
+                'results': []
+            }, status=200)
+
+        q = request.GET.get('q')
+        cd = cache.get('geocode:{}'.format(q))
+        if cd:
+            return JsonResponse({
+                'success': True,
+                'results': cd
+            }, status=200)
+
+        try:
+            r = requests.get(
+                'https://api.opencagedata.com/geocode/v1/json?q={}&key={}'.format(
+                    quote(q), gs.settings.opencagedata_apikey
+                )
+            )
+            r.raise_for_status()
+        except IOError:
+            logger.exception("Geocoding failed")
+            return JsonResponse({
+                'success': False,
+                'results': []
+            }, status=200)
+        else:
+            d = r.json()
+        res = [
+            {
+                'formatted': r['formatted'],
+                'lat': r['geometry']['lat'],
+                'lon': r['geometry']['lng'],
+            } for r in d['results']
+        ]
+        cache.set('geocode:{}'.format(q), res, timeout=3600 * 6)
+
+        return JsonResponse({
+            'success': True,
+            'results': res
+        }, status=200)

src/pretix/control/views/main.py

@@ -134,6 +134,8 @@ class EventWizard(SafeSessionWizardView):
                 initial['currency'] = self.clone_from.currency
                 initial['date_from'] = self.clone_from.date_from
                 initial['date_to'] = self.clone_from.date_to
+                initial['geo_lat'] = self.clone_from.geo_lat
+                initial['geo_lon'] = self.clone_from.geo_lon
                 initial['presale_start'] = self.clone_from.presale_start
                 initial['presale_end'] = self.clone_from.presale_end
                 initial['location'] = self.clone_from.location
@@ -245,6 +247,8 @@ class EventWizard(SafeSessionWizardView):
                     presale_start=event.presale_start,
                     presale_end=event.presale_end,
                     location=event.location,
+                    geo_lat=event.geo_lat,
+                    geo_lon=event.geo_lon,
                     active=True
                 )