Framework to allow Chromoting host to respect NAT traversal policy in linux.

remoting/host/plugin/policy_hack/json_value_serializer.cc

+// Copyright (c) 2006-2008 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.
+
+// Forked from content/common/json_value_serializer.h
+
+#include "remoting/host/plugin/policy_hack/json_value_serializer.h"
+
+#include "base/file_util.h"
+#include "base/json/json_reader.h"
+#include "base/json/json_writer.h"
+#include "base/string_util.h"
+
+namespace remoting {
+namespace policy_hack {
+
+const char* JSONFileValueSerializer::kAccessDenied = "Access denied.";
+const char* JSONFileValueSerializer::kCannotReadFile = "Can't read file.";
+const char* JSONFileValueSerializer::kFileLocked = "File locked.";
+const char* JSONFileValueSerializer::kNoSuchFile = "File doesn't exist.";
+
+JSONStringValueSerializer::~JSONStringValueSerializer() {}
+
+bool JSONStringValueSerializer::Serialize(const Value& root) {
+  if (!json_string_ || initialized_with_const_string_)
+    return false;
+
+  base::JSONWriter::Write(&root, pretty_print_, json_string_);
+  return true;
+}
+
+Value* JSONStringValueSerializer::Deserialize(int* error_code,
+                                              std::string* error_str) {
+  if (!json_string_)
+    return NULL;
+
+  return base::JSONReader::ReadAndReturnError(*json_string_,
+                                              allow_trailing_comma_,
+                                              error_code,
+                                              error_str);
+}
+
+/******* File Serializer *******/
+
+bool JSONFileValueSerializer::Serialize(const Value& root) {
+  std::string json_string;
+  JSONStringValueSerializer serializer(&json_string);
+  serializer.set_pretty_print(true);
+  bool result = serializer.Serialize(root);
+  if (!result)
+    return false;
+
+  int data_size = static_cast<int>(json_string.size());
+  if (file_util::WriteFile(json_file_path_,
+                           json_string.data(),
+                           data_size) != data_size)
+    return false;
+
+  return true;
+}
+
+int JSONFileValueSerializer::ReadFileToString(std::string* json_string) {
+  DCHECK(json_string);
+  if (!file_util::ReadFileToString(json_file_path_, json_string)) {
+#if defined(OS_WIN)
+    int error = ::GetLastError();
+    if (error == ERROR_SHARING_VIOLATION || error == ERROR_LOCK_VIOLATION) {
+      return JSON_FILE_LOCKED;
+    } else if (error == ERROR_ACCESS_DENIED) {
+      return JSON_ACCESS_DENIED;
+    }
+#endif
+    if (!file_util::PathExists(json_file_path_))
+      return JSON_NO_SUCH_FILE;
+    else
+      return JSON_CANNOT_READ_FILE;
+  }
+  return JSON_NO_ERROR;
+}
+
+const char* JSONFileValueSerializer::GetErrorMessageForCode(int error_code) {
+  switch (error_code) {
+    case JSON_NO_ERROR:
+      return "";
+    case JSON_ACCESS_DENIED:
+      return kAccessDenied;
+    case JSON_CANNOT_READ_FILE:
+      return kCannotReadFile;
+    case JSON_FILE_LOCKED:
+      return kFileLocked;
+    case JSON_NO_SUCH_FILE:
+      return kNoSuchFile;
+    default:
+      NOTREACHED();
+      return "";
+  }
+}
+
+Value* JSONFileValueSerializer::Deserialize(int* error_code,
+                                            std::string* error_str) {
+  std::string json_string;
+  int error = ReadFileToString(&json_string);
+  if (error != JSON_NO_ERROR) {
+    if (error_code)
+      *error_code = error;
+    if (error_str)
+      *error_str = GetErrorMessageForCode(error);
+    return NULL;
+  }
+
+  JSONStringValueSerializer serializer(json_string);
+  return serializer.Deserialize(error_code, error_str);
+}
+
+}  // namespace policy_hack
+}  // namespace remoting