Componentize CookieOSCryptoDelegate

chrome/browser/net/cookie_store_util.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/net/cookie_store_util.h"
-
-#include "base/lazy_instance.h"
-#include "chrome/browser/browser_process.h"
-#include "chrome/common/chrome_constants.h"
-#include "chrome/common/chrome_switches.h"
-#include "components/os_crypt/os_crypt.h"
-#include "content/public/common/content_constants.h"
-#include "extensions/common/constants.h"
-#include "net/extras/sqlite/cookie_crypto_delegate.h"
-
-namespace chrome_browser_net {
-
-#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
-namespace {
-
-// Use the operating system's mechanisms to encrypt cookies before writing
-// them to persistent store.  Currently this only is done with desktop OS's
-// because ChromeOS and Android already protect the entire profile contents.
-class CookieOSCryptoDelegate : public net::CookieCryptoDelegate {
- public:
-  bool ShouldEncrypt() override;
-  bool EncryptString(const std::string& plaintext,
-                     std::string* ciphertext) override;
-  bool DecryptString(const std::string& ciphertext,
-                     std::string* plaintext) override;
-};
-
-bool CookieOSCryptoDelegate::ShouldEncrypt() {
-#if defined(OS_IOS)
-  // Cookie encryption is not necessary on iOS, due to OS-protected storage.
-  // However, due to https://codereview.chromium.org/135183021/, cookies were
-  // accidentally encrypted. In order to allow these cookies to still be used,a
-  // a CookieCryptoDelegate is provided that can decrypt existing cookies.
-  // However, new cookies will not be encrypted. The alternatives considered
-  // were not supplying a delegate at all (thus invalidating all existing
-  // encrypted cookies) or in migrating all cookies at once, which may impose
-  // startup costs.  Eventually, all cookies will get migrated as they are
-  // rewritten.
-  return false;
-#else
-  return true;
-#endif
-}
-
-bool CookieOSCryptoDelegate::EncryptString(const std::string& plaintext,
-                                           std::string* ciphertext) {
-  return OSCrypt::EncryptString(plaintext, ciphertext);
-}
-
-bool CookieOSCryptoDelegate::DecryptString(const std::string& ciphertext,
-                                           std::string* plaintext) {
-  return OSCrypt::DecryptString(ciphertext, plaintext);
-}
-
-// Using a LazyInstance is safe here because this class is stateless and
-// requires 0 initialization.
-base::LazyInstance<CookieOSCryptoDelegate> g_cookie_crypto_delegate =
-    LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-net::CookieCryptoDelegate* GetCookieCryptoDelegate() {
-  return g_cookie_crypto_delegate.Pointer();
-}
-#else  // defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
-net::CookieCryptoDelegate* GetCookieCryptoDelegate() {
-  return NULL;
-}
-#endif  // defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
-
-}  // namespace chrome_browser_net