| // 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. |
| |
| #include "content/common/bluetooth/web_bluetooth_device_id.h" |
| |
| #include "base/base64.h" |
| #include "base/strings/string_util.h" |
| #include "crypto/random.h" |
| |
| namespace content { |
| |
| namespace { |
| |
| enum { kDeviceIdLength = 16 /* 128 bits */ }; |
| |
| } // namespace |
| |
| WebBluetoothDeviceId::WebBluetoothDeviceId() {} |
| |
| WebBluetoothDeviceId::WebBluetoothDeviceId(std::string device_id) |
| : device_id_(std::move(device_id)) { |
| CHECK(IsValid()); |
| } |
| |
| WebBluetoothDeviceId::~WebBluetoothDeviceId() {} |
| |
| const std::string& WebBluetoothDeviceId::str() const { |
| CHECK(IsValid()); |
| return device_id_; |
| } |
| |
| // static |
| WebBluetoothDeviceId WebBluetoothDeviceId::Create() { |
| std::string bytes( |
| kDeviceIdLength + 1 /* to avoid bytes being reallocated by WriteInto */, |
| '\0'); |
| |
| crypto::RandBytes(base::WriteInto(&bytes /* str */, |
| kDeviceIdLength + 1 /* length_with_null */), |
| kDeviceIdLength); |
| |
| base::Base64Encode(bytes, &bytes); |
| |
| return WebBluetoothDeviceId(std::move(bytes)); |
| } |
| |
| // static |
| bool WebBluetoothDeviceId::IsValid(const std::string& device_id) { |
| std::string decoded; |
| if (!base::Base64Decode(device_id, &decoded)) { |
| return false; |
| } |
| |
| if (decoded.size() != kDeviceIdLength) { |
| return false; |
| } |
| |
| // When base64-encoding a 128bit string, only the two MSB are used for |
| // the 3rd-to-last character. Because of this, the 3rd-to-last character |
| // can only be one of this four characters. |
| if (!(device_id[device_id.size() - 3] == 'A' || |
| device_id[device_id.size() - 3] == 'Q' || |
| device_id[device_id.size() - 3] == 'g' || |
| device_id[device_id.size() - 3] == 'w')) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool WebBluetoothDeviceId::IsValid() const { |
| return WebBluetoothDeviceId::IsValid(device_id_); |
| } |
| |
| bool WebBluetoothDeviceId::operator==( |
| const WebBluetoothDeviceId& device_id) const { |
| return str() == device_id.str(); |
| } |
| |
| bool WebBluetoothDeviceId::operator!=( |
| const WebBluetoothDeviceId& device_id) const { |
| return !(*this == device_id); |
| } |
| |
| std::ostream& operator<<(std::ostream& out, |
| const WebBluetoothDeviceId& device_id) { |
| return out << device_id.str(); |
| } |
| |
| } // namespace content |