decodeNprofile static method

Nprofile decodeNprofile(String nprofileStr)

Decode nprofile and return Nprofile object

Implementation

static Nprofile decodeNprofile(String nprofileStr) {
  var decoder = Bech32Decoder();
  var bech32Result = decoder.convert(nprofileStr, nprofileStr.length);

  if (bech32Result.hrp != Hrps.kNprofile) {
    throw ArgumentError(
        "Invalid HRP: expected '${Hrps.kNprofile}', got '${bech32Result.hrp}'");
  }

  var data = Nip19Utils.convertBits(bech32Result.data, 5, 8, false);
  final tlv = Nip19TLV.parseTLV(data);

  String? pubkey;
  List<String> relays = [];

  for (var t in tlv) {
    switch (t.type) {
      case 0: // pubkey (special)
        if (t.value.length == 32) {
          pubkey = hex.encode(t.value);
        }
        break;
      case 1: // relay
        try {
          relays.add(utf8.decode(t.value));
        } catch (e) {
          // Ignore invalid UTF-8 per spec
        }
        break;
      default:
        // Ignore unrecognized TLV types per spec
        break;
    }
  }

  // Validate required fields
  if (pubkey == null) {
    throw ArgumentError('Missing required pubkey field (type 0)');
  }

  return Nprofile(
    pubkey: pubkey,
    relays: relays.isEmpty ? null : relays,
  );
}