Combine provisioning code for tests and improve logging

Merge from Widevine repo of http://go/wvgerrit/169018

This CL adds a provisioning holder that attempts to
provision and logs the request and response for
failures. The server team can replay the request to debug
problems on their end.

Bug: 276464340
Test: ran cast and ota tests
Change-Id: I6eed117e504ae3287f2ba16c3c507cfdc7456f8d

libwvdrmengine/cdm/core/test/provisioning_holder.h

@@ -0,0 +1,46 @@
+// 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_PROVISIONING_HOLDER_H_
+#define WVCDM_CORE_TEST_PROVISIONING_HOLDER_H_
+
+#include "test_base.h"
+
+#include <string>
+
+namespace wvcdm {
+
+class ProvisioningHolder {
+ public:
+  ProvisioningHolder(TestCdmEngine* cdm_engine,
+                     const std::string& provisioning_server_url,
+                     const std::string& provisioning_service_certificate)
+      : cdm_engine_(cdm_engine),
+        provisioning_server_url_(provisioning_server_url),
+        provisioning_service_certificate_(provisioning_service_certificate) {}
+  void Provision(CdmCertificateType cert_type, bool binary_provisioning);
+
+ protected:
+  TestCdmEngine* cdm_engine_;
+  std::string provisioning_server_url_;
+  std::string provisioning_service_certificate_;
+  std::string certificate_;
+  std::string wrapped_key_;
+
+  // Locate the portion of the server's provisioning response message that is
+  // between the strings jason_start_substr and json_end_substr. Returns the
+  // string through *result. If the start substring match fails, assume the
+  // entire string represents a serialized protobuf mesaage and return true with
+  // the entire string. If the end_substring match fails, return false with an
+  // empty *result.
+  bool ExtractSignedMessage(const std::string& response, std::string* result);
+  // Dump request and response information for use in a debug or failure log.
+  std::string DumpProvAttempt(const std::string& request,
+                              const std::string& response,
+                              CdmCertificateType cert_type);
+};
+
+}  // namespace wvcdm
+
+#endif  // WVCDM_CORE_TEST_PROVISIONING_HOLDER_H_