1 files changed, 58 insertions, 0 deletions
diff --git a/grpc/src/core/ext/transport/binder/java/io/grpc/binder/cpp/NativeConnectionHelper.java b/grpc/src/core/ext/transport/binder/java/io/grpc/binder/cpp/NativeConnectionHelper.java
new file mode 100644
index 00000000..257f6514
--- /dev/null
+++ b/grpc/src/core/ext/transport/binder/java/io/grpc/binder/cpp/NativeConnectionHelper.java
@@ -0,0 +1,58 @@
+// Copyright 2021 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package io.grpc.binder.cpp;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Parcel;
+import android.util.Log;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * This class will be invoked by gRPC binder transport internal implementation (from
+ * src/core/ext/transport/binder/client/jni_utils.cc) to perform operations that are only possible
+ * in Java
+ */
+final class NativeConnectionHelper {
+  // Maps connection id to GrpcBinderConnection instances
+  static Map<String, GrpcBinderConnection> s = new HashMap<>();
+
+  static void tryEstablishConnection(Context context, String pkg, String cls, String action_name, String connId) {
+    // TODO(mingcl): Assert that connId is unique
+    s.put(connId, new GrpcBinderConnection(context, connId));
+    s.get(connId).tryConnect(pkg, cls, action_name);
+  }
+
+  // Returns true if the packages signature of the 2 UIDs match.
+  // `context` is used to get PackageManager.
+  // Suppress unnecessary internal warnings related to checkSignatures compatibility issue.
+  // BinderTransport code is only used on newer Android platform versions so this is fine.
+  @SuppressWarnings("CheckSignatures")
+  static boolean isSignatureMatch(Context context, int uid1, int uid2) {
+    int result = context.getPackageManager().checkSignatures(uid1, uid2);
+    if (result == PackageManager.SIGNATURE_MATCH) {
+      return true;
+    }
+    Log.e(
+        "NativeConnectionHelper",
+        "Signatures does not match. checkSignature return value = " + result);
+    return false;
+  }
+
+  static Parcel getEmptyParcel() {
+    return Parcel.obtain();
+  }
+}