1 files changed, 37 insertions, 0 deletions
diff --git a/system/api/omit.go b/system/api/omit.go
new file mode 100644
index 0000000..d907712
--- /dev/null
+++ b/system/api/omit.go
@@ -0,0 +1,37 @@
+package api
+
+import (
+	"log"
+
+	"github.com/ponzu-cms/ponzu/system/item"
+
+	"github.com/tidwall/sjson"
+)
+
+func omit(it interface{}, data []byte) ([]byte, error) {
+	// is it Omittable
+	om, ok := it.(item.Omittable)
+	if !ok {
+		return data, nil
+	}
+
+	return omitFields(om, data, "data.0.")
+}
+
+func omitFields(om item.Omittable, data []byte, pathPrefix string) ([]byte, error) {
+	// get fields to omit from json data
+	fields := om.Omit()
+
+	// remove each field from json, all responses contain json object(s) in top-level "data" array
+	var omitted = data
+	for i := range fields {
+		var err error
+		omitted, err = sjson.DeleteBytes(omitted, pathPrefix+fields[i])
+		if err != nil {
+			log.Println("Erorr omitting field:", fields[i], "from item.Omittable:", om)
+			return nil, err
+		}
+	}
+
+	return omitted, nil
+}