Define FIDO U2f Device abstraction

device/u2f/u2f_device.h

Index: device/u2f/u2f_device.h
diff --git a/device/u2f/u2f_device.h b/device/u2f/u2f_device.h
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+++ b/device/u2f/u2f_device.h
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+// 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.
+
+#ifndef DEVICE_U2F_U2F_DEVICE_H_
+#define DEVICE_U2F_U2F_DEVICE_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+#include "u2f_apdu_response.h"
+
+namespace device {
+
+class U2fApduCommand;
+
+// Device abstraction for an individual U2F device. A U2F device defines the
+// standardized Register, Sign, and GetVersion methods.
+class U2fDevice {
+ public:
+  enum class ProtocolVersion {
+    U2F_V2,
+    UNKNOWN,
+  };
+  enum class ReturnCode { SUCCESS, HW_FAILURE, INVALID_PARAMS };
+
+  using MessageCallback =
+      base::Callback<void(ReturnCode, std::vector<uint8_t>)>;
+  using VersionCallback =
+      base::Callback<void(bool success, ProtocolVersion version)>;
+  using DeviceCallback =
+      base::Callback<void(bool success,
+                          scoped_refptr<U2fApduResponse> response)>;
+
+  ~U2fDevice();
+
+  // Raw messages parameters are defined by the specification at
+  // https://fidoalliance.org/specs/fido-u2f-v1.0-nfc-bt-amendment-20150514/fido-u2f-raw-message-formats.html
+  void Register(const std::vector<uint8_t>& appid_digest,
+                const ProtocolVersion version,
+                const std::vector<uint8_t>& challenge_digest,
+                const MessageCallback& callback);
+  void Version(const VersionCallback& callback);
+  void Sign(const std::vector<uint8_t>& appid_digest,
+            const std::vector<uint8_t>& challenge_digest,
+            const std::vector<uint8_t>& key_handle,
+            const MessageCallback& callback);
+
+ protected:
+  U2fDevice();
+
+  // Pure virtual function defined by each device type, implementing
+  // the device communication transaction.
+  virtual void DeviceTransact(scoped_refptr<U2fApduCommand> command,
+                              const DeviceCallback& callback) = 0;
+
+ private:
+  // TODO Callback functions for device calls
+  void OnRegisterComplete(const MessageCallback& callback,
+                          bool success,
+                          scoped_refptr<U2fApduResponse> register_response);
+  void OnSignComplete(const MessageCallback& callback,
+                      bool success,
+                      scoped_refptr<U2fApduResponse> sign_response);
+  void OnVersionComplete(const VersionCallback& callback,
+                         bool success,
+                         scoped_refptr<U2fApduResponse> version_response);
+  void OnLegacyVersionComplete(
+      const VersionCallback& callback,
+      bool success,
+      scoped_refptr<U2fApduResponse> legacy_version_response);
+
+  base::WeakPtrFactory<U2fDevice> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(U2fDevice);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_U2F_U2F_DEVICE_H_