Quelle ClipboardReadRequestParent.cpp Sprache: C

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "mozilla/ClipboardReadRequestParent.h"

#include "mozilla/dom/ContentParent.h"
#include "mozilla/net/CookieJarSettings.h"
#include "nsComponentManagerUtils.h"
#include "nsIClipboard.h"
#include "nsITransferable.h"
#include "nsThreadManager.h"
#include "nsWidgetsCID.h"

using mozilla::dom::ContentParent;
using mozilla::ipc::IPCResult;

namespace mozilla {

namespace {

class ClipboardGetDataCallback final : public nsIAsyncClipboardRequestCallback {
public:
  explicit ClipboardGetDataCallback(std::function<void(nsresult)>&& aCallback)
      : mCallback(std::move(aCallback)) {}

  // This object will never be held by a cycle-collected object, so it doesn't
  // need to be cycle-collected despite holding alive cycle-collected objects.
  NS_DECL_ISUPPORTS

  // nsIAsyncClipboardRequestCallback
  NS_IMETHOD OnComplete(nsresult aResult) override {
    mCallback(aResult);
    return NS_OK;
  }

protected:
  ~ClipboardGetDataCallback() = default;

  std::function<void(nsresult)> mCallback;
};

NS_IMPL_ISUPPORTS(ClipboardGetDataCallback, nsIAsyncClipboardRequestCallback)

static Result<nsCOMPtr<nsITransferable>, nsresult> CreateTransferable(
    const nsTArray<nsCString>& aTypes) {
  nsresult rv;
  nsCOMPtr<nsITransferable> trans =
      do_CreateInstance("@mozilla.org/widget/transferable;1", &rv);
  if (NS_FAILED(rv)) {
    return Err(rv);
  }

  MOZ_TRY(trans->Init(nullptr));
  // The private flag is only used to prevent the data from being cached to the
  // disk. The flag is not exported to the IPCDataTransfer object.
  // The flag is set because we are not sure whether the clipboard data is used
  // in a private browsing context. The transferable is only used in this scope,
  // so the cache would not reduce memory consumption anyway.
  trans->SetIsPrivateData(true);
  // Fill out flavors for transferable
  for (uint32_t t = 0; t < aTypes.Length(); t++) {
    MOZ_TRY(trans->AddDataFlavor(aTypes[t].get()));
  }

  return std::move(trans);
}

}  // namespace

IPCResult ClipboardReadRequestParent::RecvGetData(
    const nsTArray<nsCString>& aFlavors, GetDataResolver&& aResolver) {
  bool valid = false;
  if (NS_FAILED(mClipboardDataSnapshot->GetValid(&valid)) || !valid) {
    Unused << PClipboardReadRequestParent::Send__delete__(this);
    aResolver(NS_ERROR_NOT_AVAILABLE);
    return IPC_OK();
  }

  // Create transferable
  auto result = CreateTransferable(aFlavors);
  if (result.isErr()) {
    aResolver(result.unwrapErr());
    return IPC_OK();
  }

  nsCOMPtr<nsITransferable> trans = result.unwrap();
  RefPtr<ClipboardGetDataCallback> callback =
      MakeRefPtr<ClipboardGetDataCallback>([self = RefPtr{this},
                                            resolver = std::move(aResolver),
                                            trans,
                                            manager = mManager](nsresult aRv) {
        if (NS_FAILED(aRv)) {
          bool valid = false;
          if (NS_FAILED(self->mClipboardDataSnapshot->GetValid(&valid)) ||
              !valid) {
            Unused << PClipboardReadRequestParent::Send__delete__(self);
          }
          resolver(aRv);
          return;
        }

        dom::IPCTransferableData ipcTransferableData;
        nsContentUtils::TransferableToIPCTransferableData(
            trans, &ipcTransferableData, false /* aInSyncMessage */, manager);
        resolver(std::move(ipcTransferableData));
      });
  nsresult rv = mClipboardDataSnapshot->GetData(trans, callback);
  if (NS_FAILED(rv)) {
    callback->OnComplete(rv);
  }
  return IPC_OK();
}

IPCResult ClipboardReadRequestParent::RecvGetDataSync(
    const nsTArray<nsCString>& aFlavors,
    dom::IPCTransferableDataOrError* aTransferableDataOrError) {
  auto destroySoon = [&] {
    // Delete this actor, but don't do it in the middle of this sync IPC call
    // Make sure nothing else gets processed before this deletion, so use
    // DispatchDirectTaskToCurrentThread()
    RefPtr<nsIRunnable> task = NS_NewRunnableFunction(
        "ClipboardReadRequestParent_SyncError", [self = RefPtr{this}]() {
          Unused << PClipboardReadRequestParent::Send__delete__(self);
        });
    nsThreadManager::get().DispatchDirectTaskToCurrentThread(task);
  };

  bool valid = false;
  if (NS_FAILED(mClipboardDataSnapshot->GetValid(&valid)) || !valid) {
    destroySoon();
    *aTransferableDataOrError = NS_ERROR_NOT_AVAILABLE;
    return IPC_OK();
  }

  // Create transferable
  auto result = CreateTransferable(aFlavors);
  if (result.isErr()) {
    *aTransferableDataOrError = result.unwrapErr();
    return IPC_OK();
  }

  nsCOMPtr<nsITransferable> trans = result.unwrap();
  nsresult rv = mClipboardDataSnapshot->GetDataSync(trans);
  if (NS_FAILED(rv)) {
    *aTransferableDataOrError = rv;
    if (NS_FAILED(mClipboardDataSnapshot->GetValid(&valid)) || !valid) {
      destroySoon();
    }
    return IPC_OK();
  }
  dom::IPCTransferableData ipcTransferableData;
  nsContentUtils::TransferableToIPCTransferableData(
      trans, &ipcTransferableData, true /* aInSyncMessage */, mManager);
  *aTransferableDataOrError = std::move(ipcTransferableData);
  return IPC_OK();
}

}  // namespace mozilla

quality97%

¤ Dauer der Verarbeitung: 0.0 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.