getGoogleAuthUrl static method

Implementation

static String getGoogleAuthUrl({required String callbackUrl}) {
  final clientId = Auth.config.googleClientId;
  if (clientId == null || clientId.isEmpty) {
    throw AuthException(
        'Google OAuth is not configured. Set GOOGLE_CLIENT_ID.');
  }

  final state = _generateState(callbackUrl);
  final codeVerifier = _generateCodeVerifier();
  final codeChallenge = _generateCodeChallenge(codeVerifier);

  _storeAuthData(state, codeVerifier, callbackUrl);

  final params = {
    'client_id': clientId,
    'redirect_uri': callbackUrl,
    'response_type': 'code',
    'scope': 'email profile openid',
    'access_type': 'offline',
    'prompt': 'consent',
    'state': state,
    'code_challenge': codeChallenge,
    'code_challenge_method': 'S256',
  };

  return _buildUrl('https://accounts.google.com/o/oauth2/v2/auth', params);
}