Check the availability of Firebase before accepting new tokens

src/api_data/server_config.rs

@@ -77,7 +77,7 @@ impl ServerConfig {
             android_direct_download_url: conf().android_direct_download_url.clone(),
 
             notifications: NotificationsConfig {
-                has_firebase: c.firebase_token.is_some(),
+                has_firebase: c.is_firebase_available(),
                 has_independent: conf().independent_push_service.is_some(),
             },
 

src/controllers/push_notifications_controller.rs

@@ -26,6 +26,10 @@ pub fn configure(r: &mut HttpRequestHandler) -> RequestResult {
         "disabled" => PushNotificationToken::NONE,
 
         "firebase" => {
+            if !r.api_client().is_firebase_available() {
+                return r.bad_request("Firebase is unavailable!".to_string());
+            }
+
             PushNotificationToken::FIREBASE(r.post_string("firebase_token")?)
         }
 

src/data/api_client.rs

@@ -9,4 +9,10 @@ pub struct APIClient {
     pub comment: Option<String>,
     pub default_expiration_time: u64,
     pub firebase_token: Option<String>,
+}
+
+impl APIClient {
+    pub fn is_firebase_available(&self) -> bool {
+        self.firebase_token.is_some()
+    }
 }