add validation

include/data.hpp

@@ -8,6 +8,7 @@ class data : public json {
   fs::path &get_data_path();
   void create_data_directory();
   fs::path get_store_path();
+  bool validate(const json &);
 
 public:
   data();

src/data.cpp

@@ -42,6 +42,12 @@ void data::create_data_directory() {
 
 fs::path data::get_store_path() { return get_data_path() / "store.json"; }
 
-nlohmann::json data::process(const nlohmann::json &) {
+json data::process(const json &input) {
+  if (!validate(input)) {
+    return nullptr;
+  }
+
   return {{"success", true}};
 }
+
+bool data::validate(const json &input) {}

src/store.cpp

@@ -80,8 +80,11 @@ int Application::run() {
 
         const auto json_response = dat.process(data);
 
-        response->write(Status::client_error_precondition_required,
-                        json_response.dump(),
+        if (json_response.is_null()) {
+          return response::bad_object(response);
+        }
+
+        response->write(Status::success_created, json_response.dump(),
                         {header_access_control, header_application_data});
       };