add REST API

src/c3nav/api/serializers.py

@@ -0,0 +1,29 @@
+from rest_framework.serializers import ModelSerializer
+
+from ..mapdata.models import Level, Package, Source
+
+
+class BoundsMixin:
+    def to_representation(self, obj):
+        result = super().to_representation(obj)
+        if obj.bottom is not None:
+            result['bounds'] = ((obj.bottom, obj.left), (obj.top, obj.right))
+        return result
+
+
+class LevelSerializer(ModelSerializer):
+    class Meta:
+        model = Level
+        fields = ('name', 'altitude', 'package')
+
+
+class PackageSerializer(BoundsMixin, ModelSerializer):
+    class Meta:
+        model = Package
+        fields = ('name', 'depends')
+
+
+class SourceSerializer(BoundsMixin, ModelSerializer):
+    class Meta:
+        model = Source
+        fields = ('name', 'package')