dbus/string_util.cc

   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
   9 namespace dbus {
  10
  11 // This implementation is based upon D-Bus Specification Version 0.19.
  12 bool IsValidObjectPath(const std::string& value) {
  13   // A valid object path begins with '/'.
  14   if (!base::StartsWith(value, "/", base::CompareCase::SENSITIVE))
  15     return false;
  16
  17   // Elements are pieces delimited by '/'. For instance, "org", "chromium",
  18   // "Foo" are elements of "/org/chromium/Foo".
  19   int element_length = 0;
  20   for (size_t i = 1; i < value.size(); ++i) {
  21     const char c = value[i];
  22     if (c == '/') {
  23       // No element may be the empty string.
  24       if (element_length == 0)
  25         return false;
  26       element_length = 0;
  27     } else {
  28       // Each element must only contain "[A-Z][a-z][0-9]_".
  29       const bool is_valid_character =
  30           ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') ||
  31           ('0' <= c && c <= '9') || c == '_';
  32       if (!is_valid_character)
  33         return false;
  34       element_length++;
  35     }
  36   }
  37
  38   // A trailing '/' character is not allowed unless the path is the root path.
  39   if (value.size() > 1 &&
  40       base::EndsWith(value, "/", base::CompareCase::SENSITIVE))
  41     return false;
  42
  43   return true;
  44 }
  45
  46 }  // namespace dbus