1 files changed, 113 insertions, 0 deletions
diff --git a/dom/cache/FileUtilsImpl.h b/dom/cache/FileUtilsImpl.h
new file mode 100644
index 0000000000..3f00757b64
--- /dev/null
+++ b/dom/cache/FileUtilsImpl.h
@@ -0,0 +1,113 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_cache_FileUtilsImpl_h
+#define mozilla_dom_cache_FileUtilsImpl_h
+
+#include "mozilla/dom/FlippedOnce.h"
+#include "mozilla/dom/cache/FileUtils.h"
+#include "mozilla/dom/quota/ResultExtensions.h"
+
+namespace mozilla::dom::cache {
+
+template <typename Func>
+nsresult BodyTraverseFiles(
+    const Maybe<CacheDirectoryMetadata>& aDirectoryMetadata, nsIFile& aBodyDir,
+    const Func& aHandleFileFunc, const bool aCanRemoveFiles,
+    const bool aTrackQuota) {
+  // XXX This assertion proves that we can remove aTrackQuota and just check
+  // aClientMetadata.isSome()
+  MOZ_DIAGNOSTIC_ASSERT_IF(aTrackQuota, aDirectoryMetadata);
+
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  {
+    nsCOMPtr<nsIFile> parentFile;
+    nsresult rv = aBodyDir.GetParent(getter_AddRefs(parentFile));
+    MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+    MOZ_DIAGNOSTIC_ASSERT(parentFile);
+
+    nsAutoCString nativeLeafName;
+    rv = parentFile->GetNativeLeafName(nativeLeafName);
+    MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+
+    MOZ_DIAGNOSTIC_ASSERT(StringEndsWith(nativeLeafName, "morgue"_ns));
+  }
+#endif
+
+  FlippedOnce<true> isEmpty;
+  QM_TRY(quota::CollectEachFile(
+      aBodyDir,
+      [&isEmpty, &aDirectoryMetadata, aTrackQuota, &aHandleFileFunc,
+       aCanRemoveFiles](const nsCOMPtr<nsIFile>& file) -> Result<Ok, nsresult> {
+        QM_TRY_INSPECT(const auto& dirEntryKind, quota::GetDirEntryKind(*file));
+
+        switch (dirEntryKind) {
+          case quota::nsIFileKind::ExistsAsDirectory: {
+            // If it's a directory somehow, try to remove it and move on
+            DebugOnly<nsresult> result = RemoveNsIFileRecursively(
+                aDirectoryMetadata, *file, /* aTrackQuota */ false);
+            MOZ_ASSERT(NS_SUCCEEDED(result));
+            break;
+          }
+
+          case quota::nsIFileKind::ExistsAsFile: {
+            nsAutoCString leafName;
+            QM_TRY(MOZ_TO_RESULT(file->GetNativeLeafName(leafName)));
+
+            // Delete all tmp files regardless of known bodies. These are all
+            // considered orphans.
+            if (StringEndsWith(leafName, ".tmp"_ns)) {
+              if (aCanRemoveFiles) {
+                DebugOnly<nsresult> result =
+                    RemoveNsIFile(aDirectoryMetadata, *file, aTrackQuota);
+                MOZ_ASSERT(NS_SUCCEEDED(result));
+                return Ok{};
+              }
+            } else {
+              // Otherwise, it must be a .final file.
+              QM_WARNONLY_TRY_UNWRAP(
+                  const auto maybeEndingOk,
+                  OkIf(StringEndsWith(leafName, ".final"_ns)));
+
+              // If its not, try to remove it and move on.
+              if (!maybeEndingOk) {
+                DebugOnly<nsresult> result = RemoveNsIFile(
+                    aDirectoryMetadata, *file, /* aTrackQuota */ false);
+                MOZ_ASSERT(NS_SUCCEEDED(result));
+                return Ok{};
+              }
+            }
+
+            QM_TRY_INSPECT(const bool& fileDeleted,
+                           aHandleFileFunc(*file, leafName));
+            if (fileDeleted) {
+              return Ok{};
+            }
+
+            isEmpty.EnsureFlipped();
+            break;
+          }
+
+          case quota::nsIFileKind::DoesNotExist:
+            // Ignore files that got removed externally while iterating.
+            break;
+        }
+
+        return Ok{};
+      }));
+
+  if (isEmpty && aCanRemoveFiles) {
+    DebugOnly<nsresult> result = RemoveNsIFileRecursively(
+        aDirectoryMetadata, aBodyDir, /* aTrackQuota */ false);
+    MOZ_ASSERT(NS_SUCCEEDED(result));
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom::cache
+
+#endif  // mozilla_dom_cache_FileUtilsImpl_h