datasources: add support for filtering

passerelle/datasources/views.py

@@ -5,4 +5,9 @@ from models import BaseDataSource
 @to_json('api')
 def json(request, datasource):
     ds = BaseDataSource.objects.get_subclass(slug=datasource)
-    return ds.get_data()
+    q = request.GET.get('q')
+    if q:
+        q = q.lower()
+        return [x for x in ds.get_data() if q in x.lower()]
+    else:
+        return ds.get_data()