openGraphData static method

Future<Map<String, String>> openGraphData(String url)

fetch opengraph / og data from a url by parsing the html of the webpage

Implementation

/// fetch opengraph / `og` data from a url by parsing
/// the html of the webpage
static Future<Map<String, String>> openGraphData(String url) async {
  /// set user agent to null
  /// user agent should be specified at the google bot or else some
  /// website like amazon won't expose the open graph tags

  //
  final Uri videoUrl = Uri.parse(url);
  final Map<String, String> headers = {
    'User-Agent':
        "mozilla/5.0 (compatible; googlebot/2.1; +http://www.google.com/bot.html)"
  };

  /// fetch html body
  _http.Response response;
  try {
    response = await _http.get(videoUrl, headers: headers);
  } catch (_) {
    throw _;
  }
  final Map<String, String> og = {};

  /// parse html body
  final _dom.Document doc = parse(response.body);
  doc.getElementsByTagName('meta').forEach((element) {
    if (element.attributes['property'] == "og:description") {
      og['description'] = element.attributes['content'] ?? "";
    }
    if (element.attributes['property'] == "og:url") {
      og['url'] = element.attributes['content'] ?? "";
    }
  });

  return og;
}