decodeUri function

Uri decodeUri(String encodedUrl)

Implementation

Uri decodeUri(String encodedUrl) {
  Uri decodedUri;

  /// The URL doesn't have to be encoded at all as per LUD-17: Protocol schemes and raw (non bech32-encoded) URLs.
  /// https://github.com/lnurl/luds/blob/luds/17.md
  /// Handle non bech32-encoded LNURL
  final lud17prefixes = ['lnurlw', 'lnurlc', 'lnurlp', 'keyauth'];
  decodedUri = Uri.parse(encodedUrl);
  for (final prefix in lud17prefixes) {
    if (decodedUri.scheme.contains(prefix)) {
      decodedUri = decodedUri.replace(scheme: prefix);
    }
  }
  if (lud17prefixes.contains(decodedUri.scheme)) {
    /// If the non-bech32 LNURL is a Tor address, the port has to be http instead of https for the clearnet LNURL so check if the host ends with '.onion' or '.onion.'
    decodedUri = decodedUri.replace(
        scheme: decodedUri.host.endsWith('onion') ||
                decodedUri.host.endsWith('onion.')
            ? 'http'
            : 'https');
  } else {
    /// Try to parse the input as a lnUrl. Will throw an error if it fails.
    final lnUrl = findLnUrl(encodedUrl);

    /// Decode the lnurl using bech32
    final bech32 = Bech32Codec().decode(lnUrl, lnUrl.length);
    decodedUri = Uri.parse(utf8.decode(fromWords(bech32.data)));
  }
  return decodedUri;
}