# Flutter + Firebase Function starter

The Flutter app records AAC/M4A with `record`, signs in anonymously, and sends the
take to a Firebase HTTPS Function that holds the TonePerfect key.

```sh
cd functions && npm install
firebase functions:secrets:set TONEPERFECT_API_KEY   # start with a tp_test_ key
firebase deploy --only functions:assess              # note the function URL

cd .. && flutterfire configure
flutter run --dart-define=ASSESS_URL=https://assess-xxxx.a.run.app
```

Add microphone permissions: `NSMicrophoneUsageDescription` in `ios/Runner/Info.plist`
and `<uses-permission android:name="android.permission.RECORD_AUDIO"/>` in
`android/app/src/main/AndroidManifest.xml`.

The function rejects calls without a Firebase ID token. Anonymous sign-in keeps
the sample short; for a real app require your normal sign-in and add a per-user
quota (for example a Firestore counter) before calling the API.