1 files changed, 125 insertions, 0 deletions
diff --git a/dom/events/DataTransferItemList.h b/dom/events/DataTransferItemList.h
new file mode 100644
index 0000000000..82977999db
--- /dev/null
+++ b/dom/events/DataTransferItemList.h
@@ -0,0 +1,125 @@
+/* -*- 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_DataTransferItemList_h
+#define mozilla_dom_DataTransferItemList_h
+
+#include "mozilla/dom/DataTransfer.h"
+#include "mozilla/dom/DataTransferItem.h"
+#include "mozilla/dom/FileList.h"
+
+class nsIVariant;
+
+namespace mozilla::dom {
+
+class DataTransfer;
+class DataTransferItem;
+
+class DataTransferItemList final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(DataTransferItemList);
+
+  explicit DataTransferItemList(DataTransfer* aDataTransfer)
+      : mDataTransfer(aDataTransfer) {
+    MOZ_ASSERT(aDataTransfer);
+    // We always allocate an index 0 in our DataTransferItemList. This is done
+    // in order to maintain the invariants according to the spec. Mainly, within
+    // the spec's list, there is intended to be a single copy of each mime type,
+    // for string typed items. File typed items are allowed to have duplicates.
+    // In the old moz* system, this was modeled by having multiple indexes, each
+    // of which was independent. Files were fetched from all indexes, but
+    // strings were only fetched from the first index. In order to maintain this
+    // correlation and avoid breaking code with the new changes, index 0 is now
+    // always present and used to store strings, and all file items are given
+    // their own index starting at index 1.
+    mIndexedItems.SetLength(1);
+  }
+
+  already_AddRefed<DataTransferItemList> Clone(
+      DataTransfer* aDataTransfer) const;
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  uint32_t Length() const { return mItems.Length(); };
+
+  DataTransferItem* Add(const nsAString& aData, const nsAString& aType,
+                        nsIPrincipal& aSubjectPrincipal, ErrorResult& rv);
+  DataTransferItem* Add(File& aData, nsIPrincipal& aSubjectPrincipal,
+                        ErrorResult& aRv);
+
+  void Remove(uint32_t aIndex, nsIPrincipal& aSubjectPrincipal,
+              ErrorResult& aRv);
+
+  DataTransferItem* IndexedGetter(uint32_t aIndex, bool& aFound) const;
+
+  DataTransfer* GetParentObject() const { return mDataTransfer; }
+
+  void Clear(nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv);
+
+  // @param aHidden true, iff the item should be hidden from non-chrome code.
+  already_AddRefed<DataTransferItem> SetDataWithPrincipal(
+      const nsAString& aType, nsIVariant* aData, uint32_t aIndex,
+      nsIPrincipal* aPrincipal, bool aInsertOnly, bool aHidden,
+      ErrorResult& aRv);
+
+  already_AddRefed<FileList> Files(nsIPrincipal* aPrincipal);
+
+  // Moz-style helper methods for interacting with the stored data
+  void MozRemoveByTypeAt(const nsAString& aType, uint32_t aIndex,
+                         nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv);
+  DataTransferItem* MozItemByTypeAt(const nsAString& aType, uint32_t aIndex);
+  const nsTArray<RefPtr<DataTransferItem>>* MozItemsAt(uint32_t aIndex);
+  uint32_t MozItemCount() const;
+
+  // Causes everything in indexes above 0 to shift down one index.
+  void PopIndexZero();
+
+  // Delete every item in the DataTransferItemList, without checking for
+  // permissions or read-only status (for internal use only).
+  void ClearAllItems();
+
+  void GetTypes(nsTArray<nsString>& aTypes, CallerType aCallerType) const;
+  bool HasType(const nsAString& aType) const;
+  bool HasFile() const;
+
+ private:
+  void ClearDataHelper(DataTransferItem* aItem, uint32_t aIndexHint,
+                       uint32_t aMozOffsetHint, nsIPrincipal& aSubjectPrincipal,
+                       ErrorResult& aRv);
+
+  // @param aHidden true, iff the item should be hidden from non-chrome code.
+  DataTransferItem* AppendNewItem(uint32_t aIndex, const nsAString& aType,
+                                  nsIVariant* aData, nsIPrincipal* aPrincipal,
+                                  bool aHidden);
+  void RegenerateFiles();
+  void GenerateFiles(FileList* aFiles, nsIPrincipal* aFilesPrincipal);
+
+  ~DataTransferItemList() = default;
+
+  RefPtr<DataTransfer> mDataTransfer;
+  RefPtr<FileList> mFiles;
+  // The principal for which mFiles is cached
+  nsCOMPtr<nsIPrincipal> mFilesPrincipal;
+  // mItems is the list of items that corresponds to the spec concept of a
+  // DataTransferItemList.  That is, this is the thing the spec's indexed getter
+  // operates on.  The items in here are a subset of the items present in the
+  // arrays that live in mIndexedItems.
+  nsTArray<RefPtr<DataTransferItem>> mItems;
+  // mIndexedItems represents all our items.  For any given index, all items at
+  // that index have different types in the GetType() sense.  That means that
+  // representing multiple items with the same type (e.g. multiple files)
+  // requires using multiple indices.
+  //
+  // There is always a (possibly empty) list of items at index 0, so
+  // mIndexedItems.Length() >= 1 at all times.
+  nsTArray<nsTArray<RefPtr<DataTransferItem>>> mIndexedItems;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_DataTransferItemList_h