Use aidl interface for Widevine service.

The interface is defined in
hardware/interfaces/drm/aidl(http://go/ag/15329852).

Test: build
  m android.hardware.drm-service.widevine -j128

Test: build_and_run_all_unit_tests.sh
  for hidl tests

Test: atest VtsAidlHalDrmTargetTest

Bug: 200055138
Bug: 170964303
Change-Id: If2f2a129914436ba5cef1c46f6cb9415e12c3d1c

libwvdrmengine/aidl_src/WVCryptoFactory.cpp

@@ -0,0 +1,65 @@
+//
+// Copyright 2021 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine License
+// Agreement.
+//
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "WVCdm"
+#include "WVCryptoFactory.h"
+
+#include <android/binder_ibinder_platform.h>
+#include <binder/IPCThreadState.h>
+#include <utils/Log.h>
+
+#include "Utils.h"
+#include "WVCDMSingleton.h"
+#include "WVCryptoPlugin.h"
+#include "WVUUID.h"
+
+namespace wvdrm {
+namespace hardware {
+namespace drm {
+namespace widevine {
+
+using ::aidl::android::hardware::drm::Status;
+using ::aidl::android::hardware::drm::Uuid;
+
+::ndk::ScopedAStatus WVCryptoFactory::isCryptoSchemeSupported(
+    const Uuid& in_uuid, bool* _aidl_return) {
+  *_aidl_return = isWidevineUUID(in_uuid.uuid.data());
+  return ::ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus WVCryptoFactory::createPlugin(
+    const ::aidl::android::hardware::drm::Uuid& in_uuid,
+    const std::vector<uint8_t>& in_initData,
+    std::shared_ptr<::aidl::android::hardware::drm::ICryptoPlugin>*
+        _aidl_return) {
+  const auto& self = android::IPCThreadState::self();
+  const char* sid = self->getCallingSid();
+  sid = sid ? (std::strstr(sid, "mediadrmserver") ? sid : "app") : "nullptr";
+  ALOGI("[%s] calling %s", sid, __PRETTY_FUNCTION__);
+
+  bool isSupported = false;
+  isCryptoSchemeSupported(in_uuid, &isSupported);
+  if (!isSupported) {
+    ALOGE(
+        "Widevine Drm HAL: failed to create crypto plugin, "
+        "invalid crypto scheme");
+    *_aidl_return = nullptr;
+    return toNdkScopedAStatus(Status::ERROR_DRM_CANNOT_HANDLE);
+  }
+
+  std::shared_ptr<WVCryptoPlugin> plugin =
+      ::ndk::SharedRefBase::make<WVCryptoPlugin>(in_initData.data(),
+                                                 in_initData.size(), getCDM());
+  AIBinder_setRequestingSid(plugin->asBinder().get(), true);
+  *_aidl_return = std::move(plugin);
+  return toNdkScopedAStatus(Status::OK);
+}
+
+}  // namespace widevine
+}  // namespace drm
+}  // namespace hardware
+}  // namespace wvdrm