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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SHARING_MESSAGE_VAPID_KEY_MANAGER_H_
#define COMPONENTS_SHARING_MESSAGE_VAPID_KEY_MANAGER_H_
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/memory/raw_ptr.h"
namespace crypto {
class ECPrivateKey;
} // namespace crypto
namespace syncer {
class SyncService;
} // namespace syncer
class SharingSyncPreference;
enum class SharingVapidKeyCreationResult;
// Responsible for creating, storing and managing VAPID key. VAPID key is
// shared across all devices for a single user and is used for signing VAPID
// headers for Web Push.
// Web Push Protocol :
// https://developers.google.com/web/fundamentals/push-notifications/web-push-protocol
class VapidKeyManager {
public:
explicit VapidKeyManager(SharingSyncPreference* sharing_sync_preference,
syncer::SyncService* sync_service);
VapidKeyManager(const VapidKeyManager&) = delete;
VapidKeyManager& operator=(const VapidKeyManager&) = delete;
virtual ~VapidKeyManager();
// Returns the cached key. If absent, first attempts to refresh the cached
// key. May return nullptr if cached key is absent after refresh.
virtual crypto::ECPrivateKey* GetOrCreateKey();
// Attempts to refresh cached key and returns if cached key has changed:
// 1. Attempts to cache the key stored in sync prefernece.
// 2. If failed and cahced key is absent, attempts to generate a new key. If
// successful, cache it and store in sync preference.
bool RefreshCachedKey();
private:
// Attempts to update cached key if |new_key| is different from cached
// key, and store updated key to sync preferences. Returns true if cached
// key is updated.
bool UpdateCachedKey(std::unique_ptr<crypto::ECPrivateKey> new_key);
// Attempts to update cached key with key stored in sync preferences. Returns
// true if cached key is updated.
bool InitWithPreference();
// Used for storing and fetching VAPID key from preferences.
raw_ptr<SharingSyncPreference> sharing_sync_preference_;
raw_ptr<syncer::SyncService> sync_service_;
std::unique_ptr<crypto::ECPrivateKey> vapid_key_;
std::vector<uint8_t> vapid_key_info_;
};
#endif // COMPONENTS_SHARING_MESSAGE_VAPID_KEY_MANAGER_H_
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