Add U2F request state machines

device/u2f/u2f_register.cc

+// Copyright 2017 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 "u2f_register.h"
+
+#include "base/memory/ptr_util.h"
+
+namespace device {
+
+U2fRegister::U2fRegister(std::vector<uint8_t> challenge_hash,
+                         std::vector<uint8_t> app_param,
+                         const ResponseCallback& cb)
+    : U2fRequest(cb),
+      challenge_hash_(challenge_hash),
+      app_param_(app_param),
+      weak_factory_(this) {}
+
+U2fRegister::~U2fRegister() {}
+
+// static
+std::unique_ptr<U2fRequest> U2fRegister::TryRegistration(
+    std::vector<uint8_t> challenge_hash,
+    std::vector<uint8_t> app_param,
+    const ResponseCallback& cb) {
+  std::unique_ptr<U2fRequest> request =
+      base::MakeUnique<U2fRegister>(challenge_hash, app_param, cb);
+  if (request)

[Reilly Grant (use Gerrit), 2017/04/21 17:19:16]

base::MakeUnique cannot fail.

[Casey Piper, 2017/04/21 18:42:26]

Acknowledged.

+    request->Start();
+  return request;
+}
+
+void U2fRegister::TryDevice() {
+  if (!current_device_)
+    return;

[Reilly Grant (use Gerrit), 2017/04/21 17:19:16]

DCHECK?

[Casey Piper, 2017/04/21 18:42:26]

Done.

+
+  current_device_->Register(
+      app_param_, challenge_hash_,
+      base::Bind(&U2fRegister::OnTryDevice, weak_factory_.GetWeakPtr()));
+}
+
+void U2fRegister::OnTryDevice(U2fDevice::ReturnCode return_code,
+                              std::vector<uint8_t> response_data) {
+  switch (return_code) {
+    case U2fDevice::ReturnCode::SUCCESS:
+      state_ = State::COMPLETE;
+      cb_.Run(static_cast<uint8_t>(return_code), response_data);
+      break;
+    case U2fDevice::ReturnCode::CONDITIONS_NOT_SATISFIED:
+      // Waiting for user touch, move on and try this device later
+      state_ = State::IDLE;
+      Transition();
+      break;
+    default:
+      state_ = State::IDLE;
+      // An error has occured, quit trying this device
+      current_device_ = nullptr;
+      Transition();
+      break;
+  }
+}
+
+}  // namespace device