Generate golden data tests for ODK

Generate core message request and responses for
golden data tests.

This CL does not have any golden data. The golden data
will be added to a google3 CL.

To turn on dumping of golden data, set the environment
variable DUMP_GOLDEN_DATA to "yes".

Merged from https://widevine-internal-review.googlesource.com/171750

Change-Id: I7ae2d76ec7330d9131aae98dfd07b7909d10f726

libwvdrmengine/cdm/core/test/message_dumper.h

@@ -0,0 +1,39 @@
+// Copyright 2023 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine License
+// Agreement.
+
+#ifndef WVCDM_CORE_TEST_MESSAGE_DUMPER_H_
+#define WVCDM_CORE_TEST_MESSAGE_DUMPER_H_
+
+#include <fstream>
+#include <string>
+#include <vector>
+
+#include <gtest/gtest.h>
+
+#include "log.h"
+#include "wv_cdm_types.h"
+
+namespace wvcdm {
+
+class MessageDumper : public ::testing::Environment {
+  // This dumps messages to a file so that the data can easily be turned
+  // into golden data tests for the ODK library.
+ public:
+  ~MessageDumper() override {}
+  void SetUp() override;
+  void TearDown() override;
+
+  static void DumpLicenseRequest(const CdmKeyRequest& request);
+  static void DumpLicense(const std::string& response);
+  static void DumpRenewalRequest(const CdmKeyRequest& request);
+  static void DumpRenewal(const std::string& response);
+  static void DumpProvisioningRequest(const CdmProvisioningRequest& request);
+  static void DumpProvisioning(const CdmProvisioningResponse& response);
+  static std::ofstream license_file;
+  static std::ofstream renewal_file;
+  static std::ofstream provision_file;
+};
+}  // namespace wvcdm
+
+#endif  // WVCDM_CORE_TEST_MESSAGE_DUMPER_H_