authorizeFromCallback method

@override Future<AuthResult?> authorizeFromCallback(String callbackUrl)

Implementation

@override
Future<AuthResult?> authorizeFromCallback(String callbackUrl) async {
  final parsed = Uri.parse(callbackUrl);
  final code = parsed.queryParameters['code'] as String;
  final state = parsed.queryParameters['state'] as String;

  log(code);
  log(state);

  if (this.state == state) {
    final res = await _post(
      _accessTokenPath,
      {
        'client_id': clientId,
        'client_secret': clientSecret,
        'code': code,
        'redirect_uri': redirectUri,
      },
    );

    if (res == null) throw Exception("Couldn't authroize");

    final decodedRes = json.decode(res);

    return AuthResult(
      accessToken: decodedRes['access_token'],
    );
  } else {
    throw Exception("Couldn't authroize, the state recieved by GitHub "
        "doesn't match state used to authorize.");
  }
}