device/bluetooth/public/mojom/uuid_mojom_traits.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 DEVICE_BLUETOOTH_PUBLIC_MOJOM_UUID_MOJOM_TRAITS_H_
#define DEVICE_BLUETOOTH_PUBLIC_MOJOM_UUID_MOJOM_TRAITS_H_

#include <string>

#include "device/bluetooth/bluetooth_uuid.h"
#include "device/bluetooth/public/mojom/uuid.mojom.h"

namespace mojo {

template <>
struct StructTraits<bluetooth::mojom::UUIDDataView, device::BluetoothUUID> {
  static const std::string& uuid(const device::BluetoothUUID& uuid) {
    return uuid.canonical_value();
  }

  static bool Read(bluetooth::mojom::UUIDDataView input,
                   device::BluetoothUUID* output) {
    std::string result;
    if (!input.ReadUuid(&result))
      return false;
    *output = device::BluetoothUUID(result);

    // If the format isn't 128-bit, .value() would return a different answer
    // than .canonical_value(). Then if browser-side code accidentally checks
    // .value() against a 128-bit string literal, a hostile renderer could use
    // the 16- or 32-bit format and evade the check.
    return output->IsValid() &&
           output->format() == device::BluetoothUUID::kFormat128Bit;
  }
};

}  // namespace mojo

#endif  // DEVICE_BLUETOOTH_PUBLIC_MOJOM_UUID_MOJOM_TRAITS_H_