Implement unsubscribe function in Notification controller.

src/controller/mod.rs

@@ -5,6 +5,6 @@ use rocket::fairing::AdHoc;
 pub fn route_stage() -> AdHoc {
     return AdHoc::on_ignite("Initializing controller routes...", |rocket| async {
         rocket
-            .mount("/", routes![notification::subscribe])
+            .mount("/", routes![notification::subscribe, notification::unsubscribe]);
     });
 }

src/controller/notification.rs

@@ -14,4 +14,12 @@ pub fn subscribe(product_type: &str) -> Result<Json<SubscriberRequest>> {
         Ok(f) => Ok(Json::from(f)),
         Err(e) => Err(e)
     };
+}
+
+#[get("/unsubscribe/<product_type>")]
+pub fn unsubscribe(product_type: &str) -> Result<Json<SubscriberRequest>> {
+    return match NotificationService::unsubscribe(product_type) {
+        Ok(f) => Ok(Json::from(f)),
+        Err(e) => Err(e)
+    };
 }
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