expandShortUrl static method

Future<String?> expandShortUrl(String shortUrl, { int timeoutSeconds = 10, })

A comprehensive utility class for extracting location information from Google Maps URLs.

This enhanced version supports all known Google Maps URL formats including:

• Standard map URLs with coordinates
• Place URLs with embedded coordinates
• Shortened URLs (goo.gl, maps.app.goo.gl)
• Street View URLs
• Directions URLs
• Embedded map URLs
• Mobile deep links
• Plus codes
• International Google domain variants

Example usage:

final url = 'https://maps.app.goo.gl/mWtb4a1cUE9zMWya7';
final coordinates = await GoogleMapsExtractor.processGoogleMapsUrl(url);
if (coordinates != null) {
  print('Latitude: ${coordinates['latitude']}');
  print('Longitude: ${coordinates['longitude']}');
} else {
  print('Failed to extract coordinates');
}

Expands shortened URLs with enhanced error handling and timeout

Implementation

/// Expands shortened URLs with enhanced error handling and timeout
static Future<String?> expandShortUrl(
  String shortUrl, {
  int timeoutSeconds = 10,
}) async {
  http.Client? client;
  try {
    client = http.Client();
    final http.Request request = http.Request('GET', Uri.parse(shortUrl))
      ..followRedirects = false;

    final http.StreamedResponse response = await client
        .send(request)
        .timeout(Duration(seconds: timeoutSeconds));

    if (response.statusCode == 301 ||
        response.statusCode == 302 ||
        response.statusCode == 307 ||
        response.statusCode == 308) {
      final String? location = response.headers['location'];
      return location;
    }

    // Some services return 200 with a redirect in the body
    if (response.statusCode == 200) {
      final String responseBody = await response.stream.bytesToString();

      // Look for meta refresh redirects
      final RegExp metaRefreshRegex = RegExp(
        r"url=([^\'>\s]+)",
        caseSensitive: false,
      );
      final RegExpMatch? match = metaRefreshRegex.firstMatch(responseBody);
      if (match != null) {
        return match.group(1);
      }

      // Look for JavaScript redirects - FIXED REGEX
      final RegExp jsRedirectRegex = RegExp(
        r"window\.location\.href\s*=\s*[\']([^\']+)[\']",
      );
      final RegExpMatch? jsMatch = jsRedirectRegex.firstMatch(responseBody);
      if (jsMatch != null) {
        return jsMatch.group(1);
      }
    }
  } catch (e) {
    print('Error expanding URL: $e');
  } finally {
    client?.close();
  }
  return null;
}