Add U2F request state machines

device/u2f/u2f_register.cc

Index: device/u2f/u2f_register.cc
diff --git a/device/u2f/u2f_register.cc b/device/u2f/u2f_register.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0f43e260378fda6e2436d82c23cfef6b268f5ea9
--- /dev/null
+++ b/device/u2f/u2f_register.cc
@@ -0,0 +1,61 @@
+// 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(const std::vector<uint8_t>& challenge_hash,
+                         const 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(
+    const std::vector<uint8_t>& challenge_hash,
+    const std::vector<uint8_t>& app_param,
+    const ResponseCallback& cb) {
+  std::unique_ptr<U2fRequest> request =
+      base::MakeUnique<U2fRegister>(challenge_hash, app_param, cb);
+  request->Start();
+  return request;
+}
+
+void U2fRegister::TryDevice() {
+  DCHECK(current_device_);
+
+  current_device_->Register(
+      app_param_, challenge_hash_,
+      base::Bind(&U2fRegister::OnTryDevice, weak_factory_.GetWeakPtr()));
+}
+
+void U2fRegister::OnTryDevice(U2fReturnCode return_code,
+                              std::vector<uint8_t> response_data) {
+  switch (return_code) {
+    case U2fReturnCode::SUCCESS:
+      state_ = State::COMPLETE;
+      cb_.Run(return_code, response_data);
+      break;
+    case U2fReturnCode::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