gecko-dev/dom/events/Clipboard.h

/* -*- 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_Clipboard_h_
#define mozilla_dom_Clipboard_h_

#include "nsString.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/Logging.h"
#include "mozilla/dom/DataTransfer.h"

namespace mozilla {
namespace dom {

enum ClipboardReadType {
  eRead,
  eReadText,
};

class Promise;

// https://www.w3.org/TR/clipboard-apis/#clipboard-interface
class Clipboard : public DOMEventTargetHelper {
 public:
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(Clipboard, DOMEventTargetHelper)

  IMPL_EVENT_HANDLER(message)
  IMPL_EVENT_HANDLER(messageerror)

  explicit Clipboard(nsPIDOMWindowInner* aWindow);
  already_AddRefed<Promise> Read(JSContext* aCx,
                                 nsIPrincipal& aSubjectPrincipal,
                                 ErrorResult& aRv);
  already_AddRefed<Promise> ReadText(JSContext* aCx,
                                     nsIPrincipal& aSubjectPrincipal,
                                     ErrorResult& aRv);
  already_AddRefed<Promise> Write(JSContext* aCx, DataTransfer& aData,
                                  nsIPrincipal& aSubjectPrincipal,
                                  ErrorResult& aRv);
  already_AddRefed<Promise> WriteText(JSContext* aCx, const nsAString& aData,
                                      nsIPrincipal& aSubjectPrincipal,
                                      ErrorResult& aRv);

  static LogModule* GetClipboardLog();

  // Check if the Clipboard.readText API should be enabled for this context.
  // This API is only enabled for Extension and System contexts, as there is no
  // way to request the required permission for web content. If the clipboard
  // API testing pref is enabled, ReadText is enabled for web content for
  // testing purposes.
  static bool ReadTextEnabled(JSContext* aCx, JSObject* aGlobal);

  virtual JSObject* WrapObject(JSContext* aCx,
                               JS::Handle<JSObject*> aGivenProto) override;

 private:
  // Checks if dom.events.testing.asyncClipboard pref is enabled.
  // The aforementioned pref allows automated tests to bypass the security
  // checks when writing to
  //  or reading from the clipboard.
  static bool IsTestingPrefEnabled();

  already_AddRefed<Promise> ReadHelper(JSContext* aCx,
                                       nsIPrincipal& aSubjectPrincipal,
                                       ClipboardReadType aClipboardReadType,
                                       ErrorResult& aRv);

  ~Clipboard();
};

}  // namespace dom
}  // namespace mozilla
#endif  // mozilla_dom_Clipboard_h_