WebAuthnTransactionParent.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_WebAuthnTransactionParent_h

#define mozilla_dom_WebAuthnTransactionParent_h

#include "mozilla/dom/PWebAuthnTransactionParent.h"

#include "mozilla/dom/WebAuthnPromiseHolder.h"

#include "mozilla/RandomNum.h"

#include "nsIWebAuthnService.h"

/*

 * Parent process IPC implementation for WebAuthn.

*/

namespace mozilla::dom {

class WebAuthnRegisterPromiseHolder;

class WebAuthnSignPromiseHolder;

class WebAuthnTransactionParent final : public PWebAuthnTransactionParent {

  NS_INLINE_DECL_REFCOUNTING(WebAuthnTransactionParent, override);

 public:

  WebAuthnTransactionParent() = default;

  mozilla::ipc::IPCResult RecvRequestRegister(

      const WebAuthnMakeCredentialInfo& aTransactionInfo,

      RequestRegisterResolver&& aResolver);

  mozilla::ipc::IPCResult RecvRequestSign(

      const WebAuthnGetAssertionInfo& aTransactionInfo,

      RequestSignResolver&& aResolver);

  mozilla::ipc::IPCResult RecvRequestCancel();

  mozilla::ipc::IPCResult RecvRequestIsUVPAA(

      RequestIsUVPAAResolver&& aResolver);

  mozilla::ipc::IPCResult RecvDestroyMe();

  virtual void ActorDestroy(ActorDestroyReason aWhy) override;

 private:

  ~WebAuthnTransactionParent() = default;

  void CompleteTransaction();

  void DisconnectTransaction();

  nsCOMPtr<nsIWebAuthnService> mWebAuthnService;

  Maybe<uint64_t> mTransactionId;

  MozPromiseRequestHolder<WebAuthnRegisterPromise> mRegisterPromiseRequest;

  MozPromiseRequestHolder<WebAuthnSignPromise> mSignPromiseRequest;

  // Generates a probabilistically unique ID for the new transaction. IDs are 53

  // bits, as they are used in javascript. We use a random value if possible,

  // otherwise a counter.

  static uint64_t NextId() {

    static uint64_t counter = 0;

    Maybe<uint64_t> rand = mozilla::RandomUint64();

    uint64_t id =

        rand.valueOr(++counter) & UINT64_C(0x1fffffffffffff);  // 2^53 - 1

    // The transaction ID 0 is reserved.

    return id ? id : 1;

};

}  // namespace mozilla::dom

#endif  // mozilla_dom_WebAuthnTransactionParent_h