Add getSecretForAddress

src/services/service.ts

@@ -103,6 +103,11 @@ export default class Services {
     return apiReturn;
   }
 
+  public async getSecretForAddress(address: string): Promise<string | null> {
+    const db = await Database.getInstance();
+    return await db.getObject('shared_secrets', address);
+  }
+
   public async connectMember(members: Member[]): Promise<void> {
     if (members.length === 0) {
       throw new Error('Trying to connect to empty members list');