Bug 1863800 - part5 : set L1 path on the MFCDM process if it's alread…

…y created before downloading L1. r=aosmond,gerard-majax

MFCDM process can be launched without setting L1 path, if the L1 hasn't
been installed at the moment. If L1 is installed later, we would update
the path to the MFCDM process and setup its sandbox permission.

Differential Revision: https://phabricator.services.mozilla.com/D195834

dom/media/gmp/GMPServiceParent.cpp

@@ -52,6 +52,10 @@
 #  include "mozilla/dom/MediaKeys.h"  // MediaKeys::kMediaKeysRequestTopic
 #endif
 
+#ifdef MOZ_WMF_CDM
+#  include "mozilla/MFCDMParent.h"
+#endif
+
 namespace mozilla::gmp {
 
 #ifdef __CLASS__
@@ -650,6 +654,12 @@ void GeckoMediaPluginServiceParent::UpdateContentProcessGMPCapabilities(
           hasH264 = HAS_H264;
         }
       }
+#ifdef MOZ_WMF_CDM
+      if (name.Equals("gmp-widevinecdm-l1")) {
+        nsCOMPtr<nsIFile> pluginFile = gmp->GetDirectory();
+        MFCDMService::UpdateWidevineL1Path(pluginFile);
+      }
+#endif
       caps.AppendElement(std::move(x));
     }
   }

dom/media/ipc/MFCDMParent.cpp

@@ -27,6 +27,10 @@
 #include "SpecialSystemDirectory.h"  // For temp dir
 #include "WMFUtils.h"
 
+#ifdef MOZ_WMF_CDM_LPAC_SANDBOX
+#  include "sandboxBroker.h"
+#endif
+
 using Microsoft::WRL::ComPtr;
 using Microsoft::WRL::MakeAndInitialize;
 
@@ -1170,6 +1174,43 @@ RefPtr<GenericNonExclusivePromise> MFCDMService::LaunchMFCDMProcessIfNeeded(
           });
 }
 
+/* static */
+void MFCDMService::UpdateWidevineL1Path(nsIFile* aFile) {
+  RefPtr<ipc::UtilityProcessManager> utilityProc =
+      ipc::UtilityProcessManager::GetSingleton();
+  if (NS_WARN_IF(!utilityProc)) {
+    NS_WARNING("Failed to get UtilityProcessManager");
+    return;
+  }
+
+  // If the MFCDM process hasn't been created yet, then we will set the path
+  // when creating the process later.
+  const auto sandboxKind = ipc::SandboxingKind::MF_MEDIA_ENGINE_CDM;
+  if (!utilityProc->Process(sandboxKind)) {
+    return;
+  }
+
+  // The MFCDM process has been started, we need to update its L1 path and set
+  // the permission for LPAC.
+  nsString widevineL1Path;
+  MOZ_ASSERT(aFile);
+  if (NS_WARN_IF(NS_FAILED(aFile->GetTarget(widevineL1Path)))) {
+    NS_WARNING("MFCDMService::UpdateWidevineL1Path, Failed to get L1 path!");
+    return;
+  }
+
+  RefPtr<ipc::UtilityAudioDecoderChild> uadc =
+      ipc::UtilityAudioDecoderChild::GetSingleton(sandboxKind);
+  if (NS_WARN_IF(!uadc)) {
+    NS_WARNING("Failed to get UtilityAudioDecoderChild");
+    return;
+  }
+  Unused << uadc->SendUpdateWidevineL1Path(widevineL1Path);
+#ifdef MOZ_WMF_CDM_LPAC_SANDBOX
+  SandboxBroker::EnsureLpacPermsissionsOnDir(widevineL1Path);
+#endif
+}
+
 #undef MFCDM_REJECT_IF_FAILED
 #undef MFCDM_REJECT_IF
 #undef MFCDM_RETURN_IF_FAILED

dom/media/ipc/MFCDMParent.h

@@ -149,6 +149,11 @@ class MFCDMService {
   // This is used to display CDM capabilites in `about:support`.
   static void GetAllKeySystemsCapabilities(dom::Promise* aPromise);
 
+  // If Widevine L1 is downloaded after the MFCDM process is created, then we
+  // use this method to update the L1 path and setup L1 permission for the MFCDM
+  // process.
+  static void UpdateWidevineL1Path(nsIFile* aFile);
+
  private:
   static RefPtr<GenericNonExclusivePromise> LaunchMFCDMProcessIfNeeded(
       ipc::SandboxingKind aSandbox);

ipc/glue/PUtilityAudioDecoder.ipdl

@@ -37,6 +37,8 @@ parent:
 
 #ifdef MOZ_WMF_CDM
   async GetKeySystemCapabilities() returns (MFCDMCapabilitiesIPDL[] result);
+
+  async UpdateWidevineL1Path(nsString path);
 #endif
 
 child:

ipc/glue/UtilityAudioDecoderParent.cpp

@@ -194,6 +194,12 @@ IPCResult UtilityAudioDecoderParent::RecvGetKeySystemCapabilities(
       });
   return IPC_OK();
 }
+
+IPCResult UtilityAudioDecoderParent::RecvUpdateWidevineL1Path(
+    const nsString& aPath) {
+  MFCDMParent::SetWidevineL1Path(NS_ConvertUTF16toUTF8(aPath).get());
+  return IPC_OK();
+}
 #endif
 
 }  // namespace mozilla::ipc

ipc/glue/UtilityAudioDecoderParent.h

@@ -48,6 +48,8 @@ class UtilityAudioDecoderParent final : public PUtilityAudioDecoderParent {
 #ifdef MOZ_WMF_CDM
   IPCResult RecvGetKeySystemCapabilities(
       GetKeySystemCapabilitiesResolver&& aResolver);
+
+  IPCResult RecvUpdateWidevineL1Path(const nsString& aPath);
 #endif
 
  private: