add hoster basics

src/c3nav/editor/hosters/base.py

@@ -0,0 +1,16 @@
+from ...mapdata.models import Package
+
+
+class Hoster:
+    def __init__(self, name, base_url):
+        self.name = name
+        self.base_url = base_url
+
+    def get_packages(self):
+        return Package.objects.filter(home_repo__startswith=self.base_url)
+
+    def _get_session_data(self, request):
+        return request.session.setdefault('hosters', {}).setdefault(self.name, {})
+
+    def is_access_granted(self, request):
+        return self._get_session_data(request).get('access_granted', False)