intercept<BodyType> method

Implementation

@override
FutureOr<Response<BodyType>> intercept<BodyType>(
  Chain<BodyType> chain,
) async {
  final clientKey =
      clientSecret.isNotEmpty ? '$clientId:$clientSecret' : clientId;

  final response = await http.post(
    Uri.parse(tokenUrl),
    headers: {
      'Authorization': 'Basic ${base64Encode(utf8.encode(clientKey))}',
    },
    body: {
      'grant_type': 'password',
      'username': username,
      'password': password,
      'scope': scopes.join(' '),
    },
  );

  final json = jsonDecode(response.body) as Map<String, dynamic>;

  final idToken = json['id_token'];
  final accessToken = json['access_token'];

  if (idToken is! String || accessToken is! String) {
    throw ArgumentError('The user could not be logged in. '
        'Response from authentication server: ${response.body}');
  }

  final request = chain.request.copyWith(
    headers: {
      ...chain.request.headers,
      'Authorization': 'bearer $accessToken',
    },
  );

  return await chain.proceed(request);
}