1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "dbus/string_util.h"
6
7#include "base/strings/string_util.h"
8
9namespace dbus {
10
11bool IsValidObjectPath(const std::string& value) {
12  // This implementation is based upon D-Bus Specification Version 0.19.
13
14  const bool kCaseSensitive = true;
15
16  // A valid object path begins with '/'.
17  if (!StartsWithASCII(value, "/", kCaseSensitive))
18    return false;
19
20  // Elements are pieces delimited by '/'. For instance, "org", "chromium",
21  // "Foo" are elements of "/org/chromium/Foo".
22  int element_length = 0;
23  for (size_t i = 1; i < value.size(); ++i) {
24    const char c = value[i];
25    if (c == '/') {
26      // No element may be the empty string.
27      if (element_length == 0)
28        return false;
29      element_length = 0;
30    } else {
31      // Each element must only contain "[A-Z][a-z][0-9]_".
32      const bool is_valid_character =
33          ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') ||
34          ('0' <= c && c <= '9') || c == '_';
35      if (!is_valid_character)
36        return false;
37      element_length++;
38    }
39  }
40
41  // A trailing '/' character is not allowed unless the path is the root path.
42  if (value.size() > 1 && EndsWith(value, "/", kCaseSensitive))
43    return false;
44
45  return true;
46}
47
48}  // namespace dbus
49