getAccessToken static method

Implementation

static Future<String> getAccessToken() async {
  final serviceAccountJson = {
    "type": "service_account",
    "project_id": "chat-application-real-time",
    "private_key_id": dotenv.env['PRIVATE_KEY_ID'],
    "private_key": dotenv.env['PRIVATE_KEY'],
    "client_email": dotenv.env['CLIENT_EMAIL'],
    "client_id": dotenv.env['CLIENT_ID'],
    "auth_uri": "https://accounts.google.com/o/oauth2/auth",
    "token_uri": "https://oauth2.googleapis.com/token",
    "auth_provider_x509_cert_url":
        "https://www.googleapis.com/oauth2/v1/certs",
    "client_x509_cert_url": dotenv.env['CLIENT_CERT_URL'],
    "universe_domain": "googleapis.com"
  };

  List<String> scopes = [
    "https://www.googleapis.com/auth/userinfo.email",
    "https://www.googleapis.com/auth/firebase.database",
    "https://www.googleapis.com/auth/firebase.messaging",
  ];

  http.Client client = await auth.clientViaServiceAccount(
    auth.ServiceAccountCredentials.fromJson(serviceAccountJson),
    scopes,
  );

  auth.AccessCredentials credentials =
      await auth.obtainAccessCredentialsViaServiceAccount(
          auth.ServiceAccountCredentials.fromJson(serviceAccountJson),
          scopes,
          client);

  client.close();

  return credentials.accessToken.data;
}