resolveSsoCallbackParams function

SsoCallbackOutcome resolveSsoCallbackParams({ String? code, String? status, String? error, })

Interprets the query parameters the API redirects back with.

Kept separate from any I/O so the mapping stays easy to read and test.

Implementation

SsoCallbackOutcome resolveSsoCallbackParams({
  String? code,
  String? status,
  String? error,
}) {
  final hasCode = code != null && code.isNotEmpty;
  final hasStatus = status != null && status.isNotEmpty;
  final hasError = error != null && error.isNotEmpty;

  if (!hasCode && !hasStatus && !hasError) {
    return const SsoCallbackNone();
  }

  if (hasError) {
    return SsoCallbackError(_signInFailed, providerError: error);
  }

  if (status == 'error') {
    // On this path the API puts its reason in `code` rather than `error`.
    return SsoCallbackError(
      _signInFailed,
      providerError: hasCode ? code : 'oauth_failed',
    );
  }

  if (!hasCode || !hasStatus) {
    return const SsoCallbackError('Invalid SSO redirect');
  }

  return SsoCallbackExchange(code: code, status: status);
}