Fixed error handling nil UUIDs in recycle bin.

Also, only create recycle bin on demand (when deleting items).

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.3.1
+
+- Fixed error handling nil UUIDs in recycle bin.
+  Also, only create recycle bin on demand (when deleting items).
+
 ## 0.3.0+1
 
 - Minor fixes for kdbx 4.x

example/pubspec.lock

@@ -8,6 +8,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.5.2"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.4.1"
   charcode:
     dependency: transitive
     description:
@@ -28,7 +35,7 @@ packages:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.11"
+    version: "1.14.12"
   convert:
     dependency: transitive
     description:
@@ -49,7 +56,14 @@ packages:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
+  cryptography:
+    dependency: transitive
+    description:
+      name: cryptography
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.2"
   dio:
     dependency: transitive
     description:
@@ -57,6 +71,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.16"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.3"
+  ffi_helper:
+    dependency: transitive
+    description:
+      name: ffi_helper
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.4.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -76,13 +104,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.3.3"
+  isolate:
+    dependency: transitive
+    description:
+      name: isolate
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.3"
   kdbx:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "0.2.1"
+    version: "0.3.0"
   logging:
     dependency: transitive
     description:

lib/src/kdbx_dao.dart

@@ -32,27 +32,38 @@ extension KdbxDao on KdbxFile {
     return group;
   }
 
+  /// Returns the recycle bin, if it exists, null otherwise.
   KdbxGroup get recycleBin {
     final uuid = body.meta.recycleBinUUID.get();
-    if (uuid == null) {
+    if (uuid?.isNil != false) {
-      return _createRecycleBin();
+      return null;
     }
-    _logger.finer(() {
+    try {
+      return findGroupByUuid(uuid);
+    } catch (e, stackTrace) {
+      _logger.warning(() {
         final groupDebug = body.rootGroup
             .getAllGroups()
             .map((g) => '${g.uuid}: ${g.name}')
             .join('\n');
         return 'All Groups: $groupDebug';
       });
-    return findGroupByUuid(uuid);
+      _logger.severe('Inconsistency error, uuid $uuid not found in groups.', e,
+          stackTrace);
+      rethrow;
+    }
+  }
+
+  KdbxGroup getRecycleBinOrCreate() {
+    return recycleBin ?? _createRecycleBin();
   }
 
   void deleteGroup(KdbxGroup group) {
-    move(group, recycleBin);
+    move(group, getRecycleBinOrCreate());
   }
 
   void deleteEntry(KdbxEntry entry) {
-    move(entry, recycleBin);
+    move(entry, getRecycleBinOrCreate());
   }
 
   void move(KdbxObject kdbxObject, KdbxGroup toGroup) {

lib/src/kdbx_object.dart

@@ -125,6 +125,11 @@ class KdbxUuid {
   KdbxUuid.random()
       : this(base64.encode(uuidGenerator.parse(uuidGenerator.v4())));
 
+  /// https://tools.ietf.org/html/rfc4122.html#section-4.1.7
+  /// > The nil UUID is special form of UUID that is specified to have all
+  ///   128 bits set to zero.
+  static const NIL = KdbxUuid('AAAAAAAAAAAAAAAAAAAAAA==');
+
   static final Uuid uuidGenerator =
       Uuid(options: <String, dynamic>{'grng': UuidUtil.cryptoRNG});
 
@@ -142,4 +147,7 @@ class KdbxUuid {
 
   @override
   int get hashCode => uuid.hashCode;
+
+  /// Whether this is the [NIL] uuid.
+  bool get isNil => this == NIL;
 }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: kdbx
 description: KeepassX format implementation in pure dart. (kdbx 3.x and 4.x support).
-version: 0.3.0
+version: 0.3.1
 homepage: https://github.com/authpass/kdbx.dart
 
 environment:

test/kdbx4_test.dart

@@ -52,6 +52,17 @@ class Argon2Test extends Argon2Base {
   Argon2Hash argon2hash;
 }
 
+Future<KdbxFile> _readKdbxFile(
+  String filePath, {
+  String password = 'asdf',
+}) async {
+  final kdbxFormat = KdbxFormat(Argon2Test());
+  final data = await File(filePath).readAsBytes();
+  final file = await kdbxFormat.read(
+      data, Credentials(ProtectedValue.fromString(password)));
+  return file;
+}
+
 void main() {
   Logger.root.level = Level.ALL;
   PrintAppender().attachToLogger(Logger.root);
@@ -132,6 +143,21 @@ void main() {
       File('test_output_chacha20.kdbx').writeAsBytesSync(output);
     });
   });
+  group('recycle bin test', () {
+    test('empty recycle bin with "zero" uuid', () async {
+      final file = await _readKdbxFile('test/keepass2test.kdbx');
+      final recycleBin = file.recycleBin;
+      expect(recycleBin, isNull);
+    });
+    test('check deleting item', () async {
+      final file = await _readKdbxFile('test/keepass2test.kdbx');
+      expect(file.recycleBin, isNull);
+      final entry = file.body.rootGroup.getAllEntries().first;
+      file.deleteEntry(entry);
+      expect(file.recycleBin, isNotNull);
+      expect(entry.parent, equals(file.recycleBin));
+    });
+  });
 }
 
 KdbxEntry _createEntry(