Implement gnome-keyring for OSCrypt

components/os_crypt/key_storage_keyring.h

+// Copyright 2016 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.
+
+#ifndef COMPONENTS_OS_CRYPT_KEY_STORAGE_KEYRING_H_
+#define COMPONENTS_OS_CRYPT_KEY_STORAGE_KEYRING_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/threading/thread_checker.h"
+#include "components/os_crypt/key_storage_linux.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+class WaitableEvent;
+}  // namespace base
+
+// Specialisation of KeyStorageLinux that uses Libsecret.
+class KeyStorageKeyring : public KeyStorageLinux {
+ public:
+  explicit KeyStorageKeyring(
+      scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner);
+  ~KeyStorageKeyring() override;
+
+  // KeyStorageLinux
+  std::string GetKey() override;
+
+ protected:
+  // KeyStorageLinux
+  bool Init() override;
+
+ private:
+  // Gnome keyring requires calls to originate from the main thread.
+  // This is the part of GetKey() that gets dispatched to the main thread.
+  // The password is stored in |password_ptr|. If |password_loaded_ptr| is not
+  // null, it will be signaled when |password_ptr| is safe to read.
+  void GetKeyDelegate(std::string* password_ptr,
+                      base::WaitableEvent* password_loaded_ptr);
+
+  // Generate a random string and store it as OScrypt's new password.
+  std::string AddRandomPasswordInKeyring();
+
+  // Keyring calls need to originate from the main thread.
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner_;
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyStorageKeyring);
+};
+
+#endif  // COMPONENTS_OS_CRYPT_KEY_STORAGE_KEYRING_H_