Bug 934640 - Add methods for checking origin and client directory existence; r=dom-storage-reviewers,asuth

Differential Revision: https://phabricator.services.mozilla.com/D191048

dom/quota/ActorsParent.cpp

@@ -3206,6 +3206,15 @@ Result<nsCOMPtr<nsIFile>, nsresult> QuotaManager::GetOriginDirectory(
   return directory;
 }
 
+Result<bool, nsresult> QuotaManager::DoesOriginDirectoryExist(
+    const OriginMetadata& aOriginMetadata) const {
+  AssertIsOnIOThread();
+
+  QM_TRY_INSPECT(const auto& directory, GetOriginDirectory(aOriginMetadata));
+
+  QM_TRY_RETURN(MOZ_TO_RESULT_INVOKE_MEMBER(directory, Exists));
+}
+
 // static
 nsresult QuotaManager::CreateDirectoryMetadata(
     nsIFile& aDirectory, int64_t aTimestamp,
@@ -3516,6 +3525,18 @@ Result<Ok, nsresult> QuotaManager::RemoveOriginDirectory(nsIFile& aDirectory) {
       toBeRemovedStorageDir, NSID_TrimBracketsUTF16(nsID::GenerateUUID()))));
 }
 
+Result<bool, nsresult> QuotaManager::DoesClientDirectoryExist(
+    const ClientMetadata& aClientMetadata) const {
+  AssertIsOnIOThread();
+
+  QM_TRY_INSPECT(const auto& directory, GetOriginDirectory(aClientMetadata));
+
+  QM_TRY(MOZ_TO_RESULT(
+      directory->Append(Client::TypeToString(aClientMetadata.mClientType))));
+
+  QM_TRY_RETURN(MOZ_TO_RESULT_INVOKE_MEMBER(directory, Exists));
+}
+
 template <typename OriginFunc>
 nsresult QuotaManager::InitializeRepository(PersistenceType aPersistenceType,
                                             OriginFunc&& aOriginFunc) {

dom/quota/QuotaManager.h

@@ -243,6 +243,9 @@ class QuotaManager final : public BackgroundThreadObject {
   Result<nsCOMPtr<nsIFile>, nsresult> GetOriginDirectory(
       const OriginMetadata& aOriginMetadata) const;
 
+  Result<bool, nsresult> DoesOriginDirectoryExist(
+      const OriginMetadata& aOriginMetadata) const;
+
   static nsresult CreateDirectoryMetadata(
       nsIFile& aDirectory, int64_t aTimestamp,
       const OriginMetadata& aOriginMetadata);
@@ -265,6 +268,9 @@ class QuotaManager final : public BackgroundThreadObject {
 
   Result<Ok, nsresult> RemoveOriginDirectory(nsIFile& aDirectory);
 
+  Result<bool, nsresult> DoesClientDirectoryExist(
+      const ClientMetadata& aClientMetadata) const;
+
   RefPtr<UniversalDirectoryLockPromise> OpenStorageDirectory(
       const Nullable<PersistenceType>& aPersistenceType,
       const OriginScope& aOriginScope,