Replace hardcoded parameters

common/client_id_util.cc

@@ -10,9 +10,13 @@
 
 #include "glog/logging.h"
 #include "common/aes_cbc_util.h"
+#include "common/client_cert.h"
 #include "common/drm_service_certificate.h"
 #include "common/error_space.h"
+#include "common/keybox_client_cert.h"
+#include "protos/public/drm_certificate.pb.h"
 #include "protos/public/errors.pb.h"
+#include "protos/public/signed_drm_certificate.pb.h"
 
 namespace widevine {
 
@@ -37,12 +41,13 @@ bool SetClientInfo(ClientIdentification* client_id, absl::string_view name,
 }
 
 std::string GetClientInfo(const ClientIdentification& client_id,
-                     absl::string_view name) {
+                          absl::string_view name) {
   return GetClientInfo(client_id, name, std::string());
 }
 
 std::string GetClientInfo(const ClientIdentification& client_id,
-                     absl::string_view name, const std::string& default_value) {
+                          absl::string_view name,
+                          const std::string& default_value) {
   for (const auto& nv : client_id.client_info()) {
     if (nv.name() == name) {
       return nv.value();
@@ -86,4 +91,28 @@ Status DecryptEncryptedClientIdentification(
   return OkStatus();
 }
 
+uint32_t GetSystemId(const ClientIdentification& client_id) {
+  uint32_t system_id = 0;
+  if (client_id.has_token()) {
+    switch (client_id.type()) {
+      case ClientIdentification::KEYBOX:
+        system_id = KeyboxClientCert::GetSystemId(client_id.token());
+        break;
+      case ClientIdentification::DRM_DEVICE_CERTIFICATE: {
+        SignedDrmCertificate signed_drm_certificate;
+        if (signed_drm_certificate.ParseFromString(client_id.token())) {
+          DrmCertificate drm_certificate;
+          if (drm_certificate.ParseFromString(
+                  signed_drm_certificate.drm_certificate())) {
+            system_id = drm_certificate.system_id();
+          }
+        }
+      } break;
+      default:
+        break;
+    }
+  }
+  return system_id;
+}
+
 }  // namespace widevine