unwrapRawExtensionResult function

dynamic unwrapRawExtensionResult(Map<String, dynamic> response)

Unwraps a raw service extension response (from dart:developer.registerExtension). Shape: {"result": {"type": "_extensionType", "method": "...", ...actual fields...}} The success path is NOT double-encoded like Flutter inspector extensions.

Also handles error responses from ServiceExtensionResponse.error(), which arrive as: {"error": {"code": -32000, "message": "Server error", "data": {"details": "{"error": "actual message"}"}}} The actual error detail is in error'details' as a JSON-encoded string (double-encoded — the details value must itself be JSON-decoded).

Implementation

dynamic unwrapRawExtensionResult(Map<String, dynamic> response) {
  // Check for error response first
  final error = response['error'] as Map<String, dynamic>?;
  if (error != null) {
    final data = error['data'];
    if (data is Map<String, dynamic>) {
      // ServiceExtensionResponse.error() puts the detail in data['details']
      // as a JSON-encoded string, e.g. "{\"error\": \"actual message\"}"
      final details = data['details'];
      if (details is String) {
        try {
          return jsonDecode(details);
        } catch (_) {
          return {'error': details};
        }
      }
      // details absent or wrong type — fall through to generic message below
    } else if (data is String) {
      // Fallback: data itself is a JSON-encoded string
      try {
        return jsonDecode(data);
      } catch (_) {
        return {'error': data};
      }
    }
    // No usable detail found; return the generic server error message
    final message = error['message'] as String?;
    return {'error': message ?? 'Unknown error'};
  }

  final result = response['result'] as Map<String, dynamic>?;
  if (result == null) return null;
  // Remove protocol fields, return the rest
  final copy = Map<String, dynamic>.from(result);
  copy.remove('type');
  copy.remove('method');
  return copy;
}