apply beforeBreadcrumb on native iOS crumbs

Author: denrase

flutter/lib/src/integrations/load_contexts_integration.dart

@@ -155,13 +155,23 @@ class _LoadContextsIntegrationEventProcessor implements EventProcessor {
         final breadcrumbsJson =
             List<Map<dynamic, dynamic>>.from(breadcrumbsList);
         final breadcrumbs = <Breadcrumb>[];
+        final beforeBreadcrumb = _options.beforeBreadcrumb;
 
         for (final breadcrumbJson in breadcrumbsJson) {
           final breadcrumb = Breadcrumb.fromJson(
             Map<String, dynamic>.from(breadcrumbJson),
           );
-          breadcrumbs.add(breadcrumb);
+
+          if (beforeBreadcrumb != null) {
+            final processedBreadcrumb = beforeBreadcrumb(breadcrumb);
+            if (processedBreadcrumb != null) {
+              breadcrumbs.add(processedBreadcrumb);
+            }
+          } else {
+            breadcrumbs.add(breadcrumb);
+          }
         }
+
         event = event.copyWith(breadcrumbs: breadcrumbs);
       }
 

flutter/test/integrations/load_contexts_integration_test.dart

@@ -88,6 +88,42 @@ void main() {
       expect(event.breadcrumbs!.length, 1);
       expect(event.breadcrumbs!.first.message, 'event');
     });
+
+    test('apply beforeBreadcrumb to native breadcrumbs', () async {
+      fixture.options.enableScopeSync = true;
+      fixture.options.beforeBreadcrumb = (breadcrumb, {hint}) {
+        if (breadcrumb?.message == 'native-mutated') {
+          return breadcrumb?.copyWith(message: 'native-mutated-applied');
+        } else {
+          return null;
+        }
+      };
+
+      final eventBreadcrumb = Breadcrumb(message: 'event');
+      var event = SentryEvent(breadcrumbs: [eventBreadcrumb]);
+
+      final nativeMutatedBreadcrumb = Breadcrumb(message: 'native-mutated');
+      final nativeDeletedBreadcrumb = Breadcrumb(message: 'native-deleted');
+      Map<String, dynamic> loadContexts = {
+        'breadcrumbs': [
+          nativeMutatedBreadcrumb.toJson(),
+          nativeDeletedBreadcrumb.toJson(),
+        ]
+      };
+
+      final future = Future.value(loadContexts);
+      when(fixture.methodChannel.invokeMethod<dynamic>('loadContexts'))
+          .thenAnswer((_) => future);
+      // ignore: deprecated_member_use
+      _channel.setMockMethodCallHandler((MethodCall methodCall) async {});
+
+      final integration = LoadContextsIntegration(fixture.methodChannel);
+      integration.call(fixture.hub, fixture.options);
+      event = (await fixture.options.eventProcessors.first.apply(event))!;
+
+      expect(event.breadcrumbs!.length, 1);
+      expect(event.breadcrumbs!.first.message, 'native-mutated-applied');
+    });
   });
 }