Add gnubby authentication to remoting host

remoting/host/gnubby_utils.h

+// Copyright 2014 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 REMOTING_HOST_GNUBBY_UTILS_H_
+#define REMOTING_HOST_GNUBBY_UTILS_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace base {
+
+class DictionaryValue;
+
+}  // namespace base
+
+namespace remoting {
+
+// Utility methods for gnubby processing.
+
+class GnubbyUtils {
+ public:
+  // Get a gnubbyd sign request json string from a request blob.
+  static bool GetJsonFromRequest(const char* data,
+                                 int data_len,
+                                 std::string* json);
+
+  // Get response blob data from a gnubbyd sign reply json string.
+  static void GetResponseFromJson(std::string json, std::string* data);

[Sergey Ulanov, 2014/02/09 22:29:54]

const-ref for the first argument please.

[psj, 2014/02/10 22:57:22]

Done.

+
+ private:
+  // No construction - all methods are static.

[Sergey Ulanov, 2014/02/09 22:29:54]

Don't really need a class in this case - just declare two functions (similar to
auth_util.h)

[psj, 2014/02/10 22:57:22]

Done.

+  GnubbyUtils();
+
+  // Create a "web safe" base64 encoding of |data|. Replaces + with -, / with _
+  // and strips trailing = characters.
+  static void WebSafeBase64Encode(const std::string& data,

[Sergey Ulanov, 2014/02/09 22:29:54]

Since these are all private they don't need to be in the .h file, they can be
just static functions in .cc file.

[psj, 2014/02/10 22:57:22]

Done.

+                                  std::string* encoded_data);
+
+  // Decode a "web safe" base64 encoded string.
+  static void WebSafeBase64Decode(const std::string& encoded_data,
+                                  std::string* data);
+
+  // Get and decode a "web safe" base64 encoded string from a JSON dictionary.
+  static bool DecodeDataFromDictionary(const base::DictionaryValue& dictionary,
+                                       const std::string& path,
+                                       std::string* data);
+
+  DISALLOW_COPY_AND_ASSIGN(GnubbyUtils);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_GNUBBY_UTILS_H_