feat: transfer with file name

TODO.md

@@ -1,7 +1,9 @@
 - [ ] Translations
 - [ ] Drop file
-- [ ] Keep file name
+- [x] Keep file name
 - [ ] Use streams
 - [ ] Better UI/UX
 - [ ] Remove snackbars
 - [x] Use https://pub.dev/packages/webcrypto or https://pub.dev/packages/cryptography for efficient web crypto operations
+- [ ] 2 options: everyone can delete with the link | only the creator can delete
+- [ ] ox, os, original sha256, original size

lib/controllers/file_share_controller.dart

@@ -6,6 +6,7 @@ import 'package:file_saver/file_saver.dart';
 import 'package:flutter/foundation.dart';
 import 'package:get/get.dart';
 import 'package:ndk/ndk.dart';
+import 'package:path/path.dart' as p;
 
 class FileShareController extends GetxController {
   final _isLoading = false.obs;
@@ -13,7 +14,6 @@ class FileShareController extends GetxController {
   final _error = RxnString();
   final _decryptedData = Rxn<Uint8List>();
   final _metadata = Rxn<FileMetadata>();
-  final _filename = RxnString();
   final _hasStarted = false.obs;
 
   bool get isLoading => _isLoading.value;
@@ -21,7 +21,6 @@ class FileShareController extends GetxController {
   String? get error => _error.value;
   Uint8List? get decryptedData => _decryptedData.value;
   FileMetadata? get metadata => _metadata.value;
-  String? get filename => _filename.value;
   bool get hasStarted => _hasStarted.value;
 
   @override
@@ -120,10 +119,15 @@ class FileShareController extends GetxController {
 
     try {
       final mimeType = _metadata.value?.fileType ?? 'application/octet-stream';
+      final filename = _metadata.value?.filename ?? 'downloaded_file';
+
+      final nameWithoutExt = p.withoutExtension(filename);
+      final ext = p.extension(filename).replaceFirst('.', '');
+
       await FileSaver.instance.saveFile(
-        name: _filename.value ?? 'downloaded_file',
+        name: nameWithoutExt,
         bytes: _decryptedData.value!,
-        fileExtension: mimeType.split('/').last,
+        fileExtension: ext.isEmpty ? mimeType.split('/').last : ext,
         mimeType: MimeType.other,
         customMimeType: mimeType,
       );

lib/controllers/home_controller.dart

@@ -46,6 +46,7 @@ class HomePageController extends GetxController {
       final sharedFile = await shareFile(
         bytes: file.bytes!,
         contentType: mimeType,
+        filename: file.name,
       );
 
       _sharedFile.value = sharedFile;

lib/functions/create_event.dart

@@ -7,6 +7,7 @@ Future<Nip01Event> createEvent({
   required String recipientPubkey,
   required String key,
   required String nonce,
+  String? filename,
 }) async {
   final keyPair = Bip340.generatePrivateKey();
   final signer = Bip340EventSigner(
@@ -19,6 +20,7 @@ Future<Nip01Event> createEvent({
     kind: 15,
     tags: [
       if (descriptor.type != null) ["file-type", descriptor.type!],
+      if (filename != null && filename.isNotEmpty) ["filename", filename],
       ["encryption-algorithm", "aes-gcm"],
       ["decryption-key", key],
       ["decryption-nonce", nonce],

lib/functions/decrypt_blob.dart

@@ -24,9 +24,7 @@ Future<Uint8List> decryptBlob({
     0,
     encryptedBytes.length - macLength,
   );
-  final macBytes = encryptedBytes.sublist(
-    encryptedBytes.length - macLength,
-  );
+  final macBytes = encryptedBytes.sublist(encryptedBytes.length - macLength);
 
   // Create secret key from bytes
   final secretKey = SecretKey(keyBytes);

lib/functions/encrypt_blob.dart

@@ -17,9 +17,10 @@ Future<EncryptedBlob> encryptBlob(Uint8List bytes) async {
 
   // Concatenate ciphertext + MAC for storage
   final macBytes = secretBox.mac.bytes;
-  final encryptedData = Uint8List.fromList(
-    [...secretBox.cipherText, ...macBytes],
-  );
+  final encryptedData = Uint8List.fromList([
+    ...secretBox.cipherText,
+    ...macBytes,
+  ]);
 
   return EncryptedBlob(
     bytes: encryptedData,

lib/functions/share_file.dart

@@ -11,6 +11,7 @@ import 'package:ndk_flutter/ndk_flutter.dart';
 Future<SharedFile> shareFile({
   required Uint8List bytes,
   String? contentType,
+  String? filename,
 }) async {
   final ndk = Ndk(
     NdkConfig(
@@ -41,6 +42,7 @@ Future<SharedFile> shareFile({
     recipientPubkey: recipientKeyPair.publicKey,
     key: encryptedBlob.key,
     nonce: encryptedBlob.nonce,
+    filename: filename,
   );
 
   await ndk.broadcast

lib/models/file_metadata.dart

@@ -2,6 +2,7 @@ import 'package:ndk/ndk.dart';
 
 class FileMetadata {
   final String? fileType;
+  final String? filename;
   final String key;
   final String nonce;
   final String x;
@@ -10,6 +11,7 @@ class FileMetadata {
 
   FileMetadata({
     required this.fileType,
+    required this.filename,
     required this.key,
     required this.nonce,
     required this.x,
@@ -20,6 +22,7 @@ class FileMetadata {
   factory FileMetadata.fromEvent(Nip01Event event) {
     return FileMetadata(
       fileType: event.getFirstTag('file-type'),
+      filename: event.getFirstTag('filename'),
       key: event.getFirstTag('decryption-key') ?? '',
       nonce: event.getFirstTag('decryption-nonce') ?? '',
       x: event.getFirstTag('x') ?? '',

pubspec.lock

@@ -470,7 +470,7 @@ packages:
     source: hosted
     version: "9.3.0"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
       sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"

pubspec.yaml

@@ -18,6 +18,7 @@ dependencies:
   ndk: ^0.7.1-dev.19
   ndk_flutter: ^0.0.2-dev.13
   nip49: ^1.1.2
+  path: ^1.9.1
 
 dev_dependencies:
   flutter_test: