fix: replace Nip19.decode to bech32ToHex (TLV decode)

lib/login.dart

@@ -6,6 +6,7 @@ import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:ndk/domain_layer/entities/account.dart';
 import 'package:ndk/shared/nips/nip01/bip340.dart';
 import 'package:ndk/shared/nips/nip19/nip19.dart';
+import 'package:zap_stream_flutter/utils.dart';
 
 class LoginAccount {
   final AccountType type;
@@ -15,12 +16,15 @@ class LoginAccount {
   LoginAccount._({required this.type, required this.pubkey, this.privateKey});
 
   static LoginAccount nip19(String key) {
-    final keyData = Nip19.decode(key);
+    final keyData = bech32ToHex(key);
     final pubkey =
         Nip19.isKey("nsec", key) ? Bip340.getPublicKey(keyData) : keyData;
     final privateKey = Nip19.isKey("npub", key) ? null : keyData;
     return LoginAccount._(
-      type: Nip19.isKey("npub", key) ? AccountType.publicKey : AccountType.privateKey,
+      type:
+          Nip19.isKey("npub", key)
+              ? AccountType.publicKey
+              : AccountType.privateKey,
       pubkey: pubkey,
       privateKey: privateKey,
     );
@@ -46,6 +50,13 @@ class LoginAccount {
 
   static LoginAccount? fromJson(Map<String, dynamic> json) {
     if (json.length > 2 && json.containsKey("pubKey")) {
+      if ((json["pubKey"] as String).length != 64) {
+        throw "Invalid pubkey, length != 64";
+      }
+      if (json.containsKey("privateKey") &&
+          (json["privateKey"] as String).length != 64) {
+        throw "Invalid privateKey, length != 64";
+      }
       return LoginAccount._(
         type: AccountType.values.firstWhere(
           (v) => v.toString().endsWith(json["type"] as String),

lib/pages/login.dart

@@ -1,10 +1,10 @@
 import 'package:amberflutter/amberflutter.dart';
 import 'package:flutter/widgets.dart';
 import 'package:go_router/go_router.dart';
-import 'package:ndk/shared/nips/nip19/nip19.dart';
 import 'package:zap_stream_flutter/login.dart';
 import 'package:zap_stream_flutter/main.dart';
 import 'package:zap_stream_flutter/theme.dart';
+import 'package:zap_stream_flutter/utils.dart';
 import 'package:zap_stream_flutter/widgets/button.dart';
 
 class LoginPage extends StatelessWidget {
@@ -24,7 +24,7 @@ class LoginPage extends StatelessWidget {
                   final amber = Amberflutter();
                   final result = await amber.getPublicKey();
                   if (result['signature'] != null) {
-                    final key = Nip19.decode(result['signature']);
+                    final key = bech32ToHex(result['signature']);
                     loginData.value = LoginAccount.externalPublicKeyHex(key);
                     ctx.go("/");
                   }

lib/pages/login_input.dart

@@ -1,9 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
-import 'package:ndk/shared/nips/nip19/nip19.dart';
 import 'package:zap_stream_flutter/login.dart';
 import 'package:zap_stream_flutter/main.dart';
 import 'package:zap_stream_flutter/theme.dart';
+import 'package:zap_stream_flutter/utils.dart';
 import 'package:zap_stream_flutter/widgets/button.dart';
 
 class LoginInputPage extends StatefulWidget {
@@ -30,7 +30,7 @@ class _LoginInputPage extends State<LoginInputPage> {
           "Login",
           onTap: () async {
             try {
-              final keyData = Nip19.decode(_controller.text);
+              final keyData = bech32ToHex(_controller.text);
               if (keyData.isNotEmpty) {
                 loginData.value = LoginAccount.nip19(_controller.text);
                 context.go("/");

lib/pages/profile.dart

@@ -2,11 +2,11 @@ import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/widgets.dart';
 import 'package:go_router/go_router.dart';
 import 'package:ndk/ndk.dart';
-import 'package:ndk/shared/nips/nip19/nip19.dart';
 import 'package:zap_stream_flutter/imgproxy.dart';
 import 'package:zap_stream_flutter/main.dart';
 import 'package:zap_stream_flutter/rx_filter.dart';
 import 'package:zap_stream_flutter/theme.dart';
+import 'package:zap_stream_flutter/utils.dart';
 import 'package:zap_stream_flutter/widgets/avatar.dart';
 import 'package:zap_stream_flutter/widgets/button.dart';
 import 'package:zap_stream_flutter/widgets/header.dart';
@@ -20,7 +20,7 @@ class ProfilePage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final hexPubkey = Nip19.decode(pubkey);
+    final hexPubkey = bech32ToHex(pubkey);
     return ProfileLoaderWidget(hexPubkey, (ctx, state) {
       final profile = state.data ?? Metadata(pubKey: hexPubkey);
       return SingleChildScrollView(

lib/utils.dart

@@ -1,5 +1,8 @@
+import 'package:bech32/bech32.dart';
 import 'package:collection/collection.dart';
+import 'package:convert/convert.dart';
 import 'package:ndk/ndk.dart';
+import 'package:ndk/shared/nips/nip19/nip19.dart';
 
 /// Container class over event and stream info
 class StreamEvent {
@@ -238,3 +241,56 @@ String zapSum(List<Nip01Event> zaps) {
       .fold(0, (acc, v) => acc + (v.amountSats ?? 0));
   return formatSats(total);
 }
+
+String bech32ToHex(String bech32) {
+  final decoder = Bech32Decoder();
+  final data = decoder.convert(bech32, 10_000);
+  final data8bit = Nip19.convertBits(data.data, 5, 8, false);
+  if (data.hrp == "nevent" || data.hrp == "naddr" || data.hrp == "nprofile") {
+    final tlv = parseTLV(data8bit);
+    return hex.encode(tlv.firstWhere((v) => v.type == 0).value);
+  } else {
+    return hex.encode(data8bit);
+  }
+}
+
+class TLV {
+  final int type;
+  final int length;
+  final List<int> value;
+
+  TLV(this.type, this.length, this.value);
+}
+
+List<TLV> parseTLV(List<int> data) {
+  List<TLV> result = [];
+  int index = 0;
+
+  while (index < data.length) {
+    // Check if we have enough bytes for type and length
+    if (index + 2 > data.length) {
+      throw FormatException('Incomplete TLV data');
+    }
+
+    // Read type (1 byte)
+    int type = data[index];
+    index++;
+
+    // Read length (1 byte)
+    int length = data[index];
+    index++;
+
+    // Check if we have enough bytes for value
+    if (index + length > data.length) {
+      throw FormatException('TLV value length exceeds available data');
+    }
+
+    // Read value
+    List<int> value = data.sublist(index, index + length);
+    index += length;
+
+    result.add(TLV(type, length, value));
+  }
+
+  return result;
+}

lib/widgets/nostr_text.dart

@@ -5,6 +5,7 @@ import 'package:ndk/ndk.dart';
 import 'package:ndk/shared/nips/nip19/nip19.dart';
 import 'package:url_launcher/url_launcher.dart';
 import 'package:zap_stream_flutter/theme.dart';
+import 'package:zap_stream_flutter/utils.dart';
 import 'package:zap_stream_flutter/widgets/profile.dart';
 
 /// Converts a nostr note text containing links
@@ -62,10 +63,15 @@ InlineSpan _buildProfileOrNoteSpan(String word) {
       cleanedWord.startsWith('note') || cleanedWord.startsWith('nevent');
 
   if (isProfile) {
-    return _inlineMention(Nip19.decode(cleanedWord));
+    final hexKey = bech32ToHex(cleanedWord);
+    if (hexKey.isNotEmpty) {
+      return _inlineMention(hexKey);
+    } else {
+      return TextSpan(text: "@$cleanedWord");
+    }
   }
   if (isNote) {
-    final eventId = Nip19.decode(cleanedWord);
+    final eventId = bech32ToHex(cleanedWord);
     return TextSpan(text: eventId, style: TextStyle(color: PRIMARY_1));
   } else {
     return TextSpan(text: word);

pubspec.lock

@@ -26,7 +26,7 @@ packages:
     source: hosted
     version: "2.12.0"
   bech32:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: bech32
       sha256: "156cbace936f7720c79a79d16a03efad343b1ef17106716e04b8b8e39f99f7f7"

pubspec.yaml

@@ -30,6 +30,7 @@ dependencies:
   chewie: ^1.11.3
   image_picker: ^1.1.2
   emoji_picker_flutter: ^4.3.0
+  bech32: ^0.2.2
 
 dependency_overrides:
   ndk: