blob: 7ba88c0930dcee2c69a8fabcf66a0a7b89b3e9a6 [file] [log] [blame]
// 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 "third_party/blink/public/common/bluetooth/web_bluetooth_device_id.h"
#include <utility>
#include "base/base64.h"
#include "base/strings/string_util.h"
#include "crypto/random.h"
namespace blink {
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);
}
bool WebBluetoothDeviceId::operator<(
const WebBluetoothDeviceId& device_id) const {
return str() < device_id.str();
}
std::ostream& operator<<(std::ostream& out,
const WebBluetoothDeviceId& device_id) {
return out << device_id.str();
}
} // namespace blink