Implement subscribe function in Notification controller.

src/controller/mod.rs

@@ -3,6 +3,6 @@ pub mod notification;
 
 pub fn route_stage() -> AdHoc {
     return AdHoc::on_ignite("Initializing controller routes...", |rocket| async {
-        rocket.mount("/", routes![])
+        rocket.mount("/", routes![notification::subscribe])
     });
 }

src/controller/notification.rs

@@ -4,3 +4,11 @@ use crate::model::notification::Notification;
 use crate::model::subscriber::SubscriberRequest;
 use crate::service::notification::NotificationService;
 use bambangshop_receiver::Result;
+
+#[get("/subscribe/<product_type>")]
+pub fn subscribe(product_type: &str) -> Result<Json<SubscriberRequest>> {
+    return match NotificationService::subscribe(product_type) {
+        Ok(f) => Ok(Json::from(f)),
+        Err(e) => Err(e),
+    };
+}