fix: only file share creator can delete it

lib/main.dart

@@ -33,6 +33,8 @@ void main() async {
       pubkey: keyPair.publicKey,
       privkey: keyPair.privateKey!,
     );
+
+    await ndkFlutter.saveAccountsState();
   }
 
   runApp(const MainApp());

packages/file_transfer_sdk/lib/src/functions/create_event.dart

@@ -1,5 +1,6 @@
+import 'dart:convert';
+
 import 'package:ndk/ndk.dart';
-import 'package:ndk/shared/nips/nip01/bip340.dart';
 
 Future<Nip01Event> createEvent({
   required Ndk ndk,
@@ -9,32 +10,32 @@ Future<Nip01Event> createEvent({
   required String nonce,
   String? filename,
 }) async {
-  final keyPair = Bip340.generatePrivateKey();
-  final signer = Bip340EventSigner(
-    privateKey: keyPair.privateKey,
-    publicKey: keyPair.publicKey,
+  final fileMetadata = [
+    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],
+    ["x", descriptor.sha256],
+    if (descriptor.size != null) ["size", descriptor.size.toString()],
+  ];
+
+  final signer = ndk.accounts.getLoggedAccount()!.signer;
+  final content = await ndk.accounts.getLoggedAccount()!.signer.encryptNip44(
+    plaintext: jsonEncode(fileMetadata),
+    recipientPubKey: recipientPubkey,
   );
 
-  final rumor = Nip01Event(
-    pubKey: signer.publicKey,
-    kind: 15,
+  final event = Nip01Event(
+    pubKey: signer.getPublicKey(),
+    kind: 1515,
     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],
-      ["x", descriptor.sha256],
-      if (descriptor.size != null) ["size", descriptor.size.toString()],
+      ["p", recipientPubkey],
     ],
-    content: descriptor.url,
+    content: content!,
   );
 
-  final giftwrap = await ndk.giftWrap.toGiftWrap(
-    rumor: rumor,
-    recipientPubkey: recipientPubkey,
-    customSigner: signer,
-  );
+  final signedEvent = await signer.sign(event);
 
-  return giftwrap;
+  return signedEvent;
 }

packages/file_transfer_sdk/lib/src/functions/fetch_file_metdata.dart

@@ -1,3 +1,5 @@
+import 'dart:convert';
+
 import 'package:file_transfer_sdk/file_transfer_sdk.dart';
 import 'package:ndk/ndk.dart';
 import 'package:ndk/shared/nips/nip01/bip340.dart';
@@ -12,14 +14,14 @@ Future<FileMetadata> fetchFileMetadata({
     filter: Filter(ids: [decodedNevent.eventId]),
   );
 
-  Nip01Event? giftWrap;
-  await for (var event in query.stream) {
-    if (event.id != decodedNevent.eventId) continue;
-    giftWrap = event;
+  Nip01Event? event;
+  await for (var e in query.stream) {
+    if (e.id != decodedNevent.eventId) continue;
+    event = e;
     break;
   }
 
-  if (giftWrap == null) throw Exception("Event not found");
+  if (event == null) throw Exception("Event not found");
 
   final privateKey = Nip19.decode(sharedFile.encodedPrivateKey);
   final publicKey = Bip340.getPublicKey(privateKey);
@@ -28,10 +30,14 @@ Future<FileMetadata> fetchFileMetadata({
     publicKey: publicKey,
   );
 
-  final event = await ndk.giftWrap.fromGiftWrap(
-    giftWrap: giftWrap,
-    customSigner: signer,
+  final decryptedContent = await signer.decryptNip44(
+    ciphertext: event.content,
+    senderPubKey: event.pubKey,
   );
 
-  return FileMetadata.fromEvent(event);
+  List<List<String>> tags = (jsonDecode(decryptedContent!) as List)
+      .map((tag) => List<String>.from(tag as List))
+      .toList();
+
+  return FileMetadata.fromTags(tags);
 }

packages/file_transfer_sdk/lib/src/models/file_metadata.dart

@@ -19,7 +19,9 @@ class FileMetadata {
     required this.size,
   });
 
-  factory FileMetadata.fromEvent(Nip01Event event) {
+  factory FileMetadata.fromTags(List<List<String>> tags) {
+    final event = Nip01Event(pubKey: "", kind: 1, tags: tags, content: "");
+
     return FileMetadata(
       fileType: event.getFirstTag('file-type'),
       filename: event.getFirstTag('filename'),

packages/file_transfer_sdk/test/file_transfer_sdk_test.dart

@@ -1 +1,31 @@
-void main() {}
+import 'dart:typed_data';
+
+import 'package:file_transfer_sdk/src/functions/fetch_blob.dart';
+import 'package:file_transfer_sdk/src/functions/fetch_file_metdata.dart';
+import 'package:file_transfer_sdk/src/functions/share_file.dart';
+import 'package:ndk/ndk.dart';
+import 'package:ndk/shared/nips/nip01/bip340.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test("First test", () async {
+    final ndk = Ndk(
+      NdkConfig(eventVerifier: Bip340EventVerifier(), cache: MemCacheManager()),
+    );
+
+    final keyPair = Bip340.generatePrivateKey();
+
+    ndk.accounts.loginPrivateKey(
+      pubkey: keyPair.publicKey,
+      privkey: keyPair.privateKey!,
+    );
+
+    final originalData = Uint8List.fromList('Hello, World!'.codeUnits);
+
+    final share = await shareFile(ndk: ndk, bytes: originalData);
+    final fileMetadata = await fetchFileMetadata(ndk: ndk, sharedFile: share);
+    final fetchedData = await fetchBlob(ndk: ndk, fileMetadata: fileMetadata);
+
+    expect(fetchedData, originalData);
+  });
+}