add license header

Signed-off-by: Benjamin Wang <[email protected]>

pkg/legacygwjsonpb/marshal.go

@@ -1,3 +1,38 @@
+// Copyright (c) 2015, Gengo, Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright notice,
+//      this list of conditions and the following disclaimer in the documentation
+//      and/or other materials provided with the distribution.
+//
+//    * Neither the name of Gengo, Inc. nor the names of its
+//      contributors may be used to endorse or promote products derived from this
+//      software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Note: this file is a fork of the following file with minor modification.
+// https://github.com/grpc-ecosystem/grpc-gateway/blob/v1.16.0/runtime/marshal_jsonpb.go
+//
+// It's just a temporary solution. We will remove it once we upgrade the gogo/protobuf
+// to protobuf v2 in the future.
+// Reference: https://github.com/etcd-io/etcd/pull/16454#issuecomment-1690230397
+
 package legacygwjsonpb
 
 import (