Authenticate with secure storage service (#402)

* Split secure key into use case

Allows us to push authentication for key access as late as possible.

* Do not reload if biometric locked

* Linter fixes

* Fix key upgrade scenario

* Fix boolean value message parsing

* Handle systems which don't support biometrics

* Do not fail key retrieval on secret upgrade

* Ensure old key is removed regardless of upgrade success

* Log errors

node/src/services/lowdbStorage.service.ts

@@ -84,6 +84,10 @@ export class LowdbStorageService implements StorageService {
         });
     }
 
+    has(key: string): Promise<boolean> {
+        return this.get(key).then(v => v != null);
+    }
+
     save(key: string, obj: any): Promise<any> {
         return this.lockDbFile(() => {
             this.readForNoCache();