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 bool 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 (!base::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 && base::EndsWith(value, "/", kCaseSensitive))
  43     return false;
  44
  45   return true;
  46 }
  47
  48 }  // namespace dbus