Embed build number in non-apex build

Bug: 316978205
Test: m android.hardware.drm-service.widevine
Change-Id: Ibf77a0135fa832424f38619bdd2df0ccc53f5849

libwvdrmengine/Android.bp

@@ -216,6 +216,10 @@ cc_library_static {
         "libutils_headers",
     ],
 
+    generated_headers: [
+        "wv_android_build_id",
+    ],
+
     shared_libs: [
         "libbinder_ndk",
         "libcrypto",
@@ -352,3 +356,23 @@ cc_fuzz {
         ],
     },
 }
+
+python_binary_host {
+    name: "wv-android-build-id-gen",
+    srcs: [
+        "wv-android-build-id-gen.py",
+    ],
+    version: {
+        py3: {
+            embedded_launcher: true,
+        },
+    },
+}
+
+genrule {
+    name: "wv_android_build_id",
+    srcs: ["apex/apex_manifest.json"],
+    tools: ["wv-android-build-id-gen"],
+    cmd: "$(location wv-android-build-id-gen) < $(in) > $(out)",
+    out: ["wv_android_build_id.h"],
+}

libwvdrmengine/cdm/src/properties_android.cpp

@@ -4,6 +4,7 @@
 
 #include "properties.h"
 #include "properties_configuration.h"
+#include "wv_android_build_id.h"
 
 #include <unistd.h>
 #include <sstream>
@@ -136,15 +137,17 @@ bool Properties::GetWVCdmVersion(std::string* version) {
     return false;
   }
 
-  std::string apex_version = "";
+  std::string build_number;
 #ifdef __ANDROID_APEX__
-{
+  {
     auto info = widevine::apex::GetApexInfo();
-    apex_version = "@" + std::to_string(info->version);
-}
+    build_number = std::to_string(info->version);
+  }
+#else
+  build_number = WV_ANDROID_BUILD_ID;
 #endif
 
-  *version = kWVAndroidCdmVersion + apex_version;
+  *version = kWVAndroidCdmVersion + "@" + build_number;
   return true;
 }
 

libwvdrmengine/wv-android-build-id-gen.py

@@ -0,0 +1,27 @@
+import argparse
+import datetime
+import json
+import sys
+
+if __name__ == "__main__":
+
+    description = 'APEX Manifest JSON (stdin) to C++ header (stdout)'
+    parser = argparse.ArgumentParser(description=description)
+    parser.add_argument('--guard', type=str,
+                        default='WVCDM_WV_ANDROID_BUILD_ID_H_',
+                        help='Include guard')
+    args = parser.parse_args()
+
+    apex_manifest = json.load(sys.stdin)
+    output = f'''\
+// Copyright {datetime.date.today().year} Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine License
+// Agreement.
+//
+#ifndef {args.guard}
+#define {args.guard}
+
+#define WV_ANDROID_BUILD_ID "{apex_manifest['version']}"
+
+#endif  // {args.guard}'''
+    print(output)