remove recursive serialization in api and replace url root with list of all endpoints

src/c3nav/api/urls.py

@@ -1,9 +1,16 @@
-from rest_framework.routers import DefaultRouter
+import re
+from collections import OrderedDict
+
+from compressor.utils.decorators import cached_property
+from django.conf.urls import include, url
+from rest_framework.generics import GenericAPIView
+from rest_framework.response import Response
+from rest_framework.routers import SimpleRouter
 
 from c3nav.editor.api import HosterViewSet, SubmitTaskViewSet
 from c3nav.mapdata.api import FeatureTypeViewSet, FeatureViewSet, LevelViewSet, PackageViewSet, SourceViewSet
 
-router = DefaultRouter()
+router = SimpleRouter()
 router.register(r'levels', LevelViewSet)
 router.register(r'packages', PackageViewSet)
 router.register(r'sources', SourceViewSet)
@@ -12,4 +19,33 @@ router.register(r'features', FeatureViewSet)
 router.register(r'hosters', HosterViewSet, base_name='hoster')
 router.register(r'submittasks', SubmitTaskViewSet, base_name='submittask')
 
-urlpatterns = router.urls
+
+class APIRoot(GenericAPIView):
+    """
+    Welcome to the c3nav RESTful API.
+    """
+
+    def _format_pattern(self, pattern):
+        return re.sub(r'\(\?P<([^>]*[^>_])_?>[^)]+\)', r'{\1}', pattern)[1:-1]
+
+    @cached_property
+    def urls(self):
+        urls = OrderedDict()
+        for urlpattern in router.urls:
+            name = urlpattern.name
+            url = self._format_pattern(urlpattern.regex.pattern)
+            base = url.split('/', 1)[0]
+            if '-' in name:
+                urls.setdefault(base, OrderedDict())[name.split('-', 1)[1]] = url
+            else:
+                urls[name] = url
+        return urls
+
+    def get(self, request):
+        return Response(self.urls)
+
+
+urlpatterns = [
+    url(r'^$', APIRoot.as_view()),
+    url(r'', include(router.urls)),
+]