Fix: Trim Unicode NULL character for Windows support

CHANGELOG.md

@@ -7,6 +7,7 @@
 * Fix: Mark `Sentry.currentHub` as deprecated (#406)
 * Fix: Use name from pubspec.yaml for release if package id is not available (#411)
 * Feat: `SentryHttpClient` tracks the duration which a request takes and logs failed requests (#414)
+* Fix: Trim `\u0000` from Windows package info (#420)
 
 # 5.0.0
 

flutter/lib/src/default_integrations.dart

@@ -366,19 +366,31 @@ class LoadReleaseIntegration extends Integration<SentryFlutterOptions> {
     try {
       if (options.release == null || options.dist == null) {
         final packageInfo = await _packageLoader();
-        var name = packageInfo.packageName;
+        var name = _cleanString(packageInfo.packageName);
         if (name.isEmpty) {
           // Not all platforms have a packageName.
           // If no packageName is available, use the appName instead.
-          name = _cleanAppName(packageInfo.appName);
+          name = _cleanString(packageInfo.appName);
+        }
+
+        final version = _cleanString(packageInfo.version);
+        final buildNumber = _cleanString(packageInfo.buildNumber);
+
+        var release = name;
+        if (version.isNotEmpty) {
+          release = '$release@$version';
+        }
+        // At least windows sometimes does not have a buildNumber
+        if (buildNumber.isNotEmpty) {
+          release = '$release+$buildNumber';
         }
 
-        final release =
-            '$name@${packageInfo.version}+${packageInfo.buildNumber}';
         options.logger(SentryLevel.debug, 'release: $release');
 
         options.release = options.release ?? release;
-        options.dist = options.dist ?? packageInfo.buildNumber;
+        if (buildNumber.isNotEmpty) {
+          options.dist = options.dist ?? buildNumber;
+        }
       }
     } catch (error) {
       options.logger(
@@ -388,15 +400,21 @@ class LoadReleaseIntegration extends Integration<SentryFlutterOptions> {
     options.sdk.addIntegration('loadReleaseIntegration');
   }
 
-  String _cleanAppName(String appName) {
+  /// This method cleans the given string from characters which should not be
+  /// used.
+  /// For example https://docs.sentry.io/platforms/flutter/configuration/releases/#bind-the-version
+  /// imposes some requirements. Also Windows uses some characters which
+  /// should not be used.
+  String _cleanString(String appName) {
     // Replace disallowed chars with an underscore '_'
-    // https://docs.sentry.io/platforms/flutter/configuration/releases/#bind-the-version
     return appName
         .replaceAll('/', '_')
         .replaceAll('\\', '_')
         .replaceAll('\t', '_')
         .replaceAll('\r\n', '_')
         .replaceAll('\r', '_')
-        .replaceAll('\n', '_');
+        .replaceAll('\n', '_')
+        // replace Unicode NULL character with an empty string
+        .replaceAll('\u{0000}', '');
   }
 }

flutter/test/default_integrations_test.dart

@@ -267,7 +267,8 @@ void main() {
       expect(fixture.options.dist, '789');
     });
 
-    test('release name does not contain ivalid chars', () async {
+    test('release name does not contain invalid chars defined by Sentry',
+        () async {
       final loader = () {
         return Future.value(PackageInfo(
           appName: '\\/sentry\tflutter \r\nfoo\nbar\r',
@@ -283,6 +284,69 @@ void main() {
       expect(fixture.options.release, '__sentry_flutter [email protected]+789');
       expect(fixture.options.dist, '789');
     });
+
+    /// See the following issues:
+    /// - https://github.com/getsentry/sentry-dart/issues/410
+    /// - https://github.com/fluttercommunity/plus_plugins/issues/182
+    test('does not send Unicode NULL \\u0000 character in app name or version',
+        () async {
+      final loader = () {
+        return Future.value(PackageInfo(
+          // As per
+          // https://api.dart.dev/stable/2.12.4/dart-core/String-class.html
+          // this is how \u0000 is added to a string in dart
+          appName: 'sentry_flutter_example\u{0000}',
+          packageName: '',
+          version: '1.0.0\u{0000}',
+          buildNumber: '',
+        ));
+      };
+      await fixture
+          .getIntegration(loader: loader)
+          .call(MockHub(), fixture.options);
+
+      expect(fixture.options.release, '[email protected]');
+    });
+
+    /// See the following issues:
+    /// - https://github.com/getsentry/sentry-dart/issues/410
+    /// - https://github.com/fluttercommunity/plus_plugins/issues/182
+    test(
+        'does not send Unicode NULL \\u0000 character in package name or build number',
+        () async {
+      final loader = () {
+        return Future.value(PackageInfo(
+          // As per
+          // https://api.dart.dev/stable/2.12.4/dart-core/String-class.html
+          // this is how \u0000 is added to a string in dart
+          appName: '',
+          packageName: 'sentry_flutter_example\u{0000}',
+          version: '',
+          buildNumber: '123\u{0000}',
+        ));
+      };
+      await fixture
+          .getIntegration(loader: loader)
+          .call(MockHub(), fixture.options);
+
+      expect(fixture.options.release, 'sentry_flutter_example+123');
+    });
+
+    test('dist is null if build number is an empty string', () async {
+      final loader = () {
+        return Future.value(PackageInfo(
+          appName: 'sentry_flutter_example',
+          packageName: 'a.b.c',
+          version: '1.0.0',
+          buildNumber: '',
+        ));
+      };
+      await fixture
+          .getIntegration(loader: loader)
+          .call(MockHub(), fixture.options);
+
+      expect(fixture.options.dist, isNull);
+    });
   });
 }