getPublicIP function

Future<String?> getPublicIP({ Duration timeout = const Duration(seconds: 5), })

Retrieves the user's public IP address using online services.

Attempts to fetch the public IP address first from ipify.org (JSON response), and if that fails, falls back to icanhazip.com (plain text response).

The timeout parameter controls how long each request waits before failing. Returns the IP address as a String, or null if both services fail.

Implementation

Future<String?> getPublicIP({
  Duration timeout = const Duration(seconds: 5),
}) async {
  String? ip;

  // Attempt 1: Use ipify API to get public IP in JSON format
  try {
    final response = await http
        .get(Uri.parse('https://api.ipify.org?format=json'))
        .timeout(timeout); // Set timeout for the request

    if (response.statusCode == 200) {
      final data = jsonDecode(response.body); // Parse JSON response
      ip = data['ip']; // Extract IP from the response

      // If IP is valid and not empty, return it
      if (ip != null && ip.isNotEmpty) {
        return ip;
      }
    }
  } catch (e) {
    // Log error if ipify fails, only in debug mode
    if (kDebugMode) {
      print('[IP] ipify failed: $e');
    }
  }

  // Fallback: Use icanhazip.com (returns plain text IP)
  try {
    final response =
        await http.get(Uri.parse('https://icanhazip.com')).timeout(timeout);

    if (response.statusCode == 200) {
      ip = response.body.trim(); // Trim newline or extra spaces
      return ip;
    }
  } catch (e) {
    // Log error if icanhazip fails, only in debug mode
    if (kDebugMode) {
      print('[IP] icanhazip failed: $e');
    }
  }

  // If both services fail, return null
  return null;
}