Refactor

frontend/src/scripts/configuration.ts

@@ -0,0 +1,42 @@
+import firebase from 'firebase/app';
+import 'firebase/firebase-remote-config';
+
+export abstract class Configuration {
+  private static remoteConfig: firebase.remoteConfig.RemoteConfig;
+  private static initialized = false;
+
+  public static async initialize(): Promise<void> {
+    if (this.initialized) {
+      return;
+    }
+
+    const firebaseConfig = {
+      apiKey: 'AIzaSyBG85dp-AhaCW-qi_6mu77wDPSipzipIF4',
+      authDomain: 'decla-red.firebaseapp.com',
+      projectId: 'decla-red',
+      appId: '1:635208271441:web:c910843ae7e0549dadda70',
+    };
+
+    firebase.initializeApp(firebaseConfig);
+
+    this.remoteConfig = firebase.remoteConfig();
+
+    this.remoteConfig.settings = {
+      minimumFetchIntervalMillis: 0, // todo: 3600 * 1000,
+      fetchTimeoutMillis: 15 * 1000,
+    } as any;
+
+    await this.remoteConfig.ensureInitialized();
+    await this.remoteConfig.fetchAndActivate();
+
+    this.initialized = true;
+  }
+
+  public static get servers(): Array<string> {
+    if (!this.initialized) {
+      throw new Error('Configuration should be initialized');
+    }
+
+    return JSON.parse(this.remoteConfig.getValue('online_servers').asString());
+  }
+}