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//------------------------------------------------------------------------------
// <copyright file="ConfigPathUtility.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Configuration {
#if CONFIGPATHUTILITY_SYSTEMWEB
using Debug=System.Web.Util.Debug;
#endif
internal static class ConfigPathUtility {
private const char SeparatorChar = '/';
//
// A configPath is valid if
// * It does not start or end with a '/'
// * It is not null or empty, except in the case of the root configuration record
// * It does not contain '\'
// * It does not contain a path component equal to "." or ".."
//
// The checks for '\', ".", and ".." are not strictly necessary, but their presence
// could lead to problems for configuration hosts.
//
static internal bool IsValid(string configPath) {
if (String.IsNullOrEmpty(configPath)) {
return false;
}
int start = -1;
for (int examine = 0; examine <= configPath.Length; examine++) {
char ch;
if (examine < configPath.Length) {
ch = configPath[examine];
}
else {
ch = SeparatorChar;
}
// backslash disallowed
if (ch == '\\') {
return false;
}
if (ch == SeparatorChar) {
// double slash disallowed
// note this check also purposefully catches starting and ending slash
if (examine == start + 1) {
return false;
}
// "." disallowed
if (examine == start + 2 && configPath[start + 1] == '.') {
return false;
}
// ".." disallowed
if (examine == start + 3 && configPath[start + 1] == '.' && configPath[start + 2] == '.') {
return false;
}
start = examine;
}
}
return true;
}
#if !CONFIGPATHUTILITY_SYSTEMWEB
static internal string Combine(string parentConfigPath, string childConfigPath) {
Debug.Assert(String.IsNullOrEmpty(parentConfigPath) || IsValid(parentConfigPath), "String.IsNullOrEmpty(parentConfigPath) || IsValid(parentConfigPath)");
Debug.Assert(String.IsNullOrEmpty(childConfigPath) || IsValid(childConfigPath), "String.IsNullOrEmpty(childConfigPath) || IsValid(childConfigPath)");
if (String.IsNullOrEmpty(parentConfigPath)) {
return childConfigPath;
}
if (String.IsNullOrEmpty(childConfigPath)) {
return parentConfigPath;
}
return parentConfigPath + "/" + childConfigPath;
}
static internal string[] GetParts(string configPath) {
Debug.Assert(IsValid(configPath), "IsValid(configPath)");
string[] parts = configPath.Split(SeparatorChar);
return parts;
}
//
// Return the last part of a config path, e.g.
// GetName("MACHINE/WEBROOT/Default Web Site/app") == "app"
//
static internal string GetName(string configPath) {
Debug.Assert(String.IsNullOrEmpty(configPath) || IsValid(configPath), "String.IsNullOrEmpty(configPath) || IsValid(configPath)");
if (String.IsNullOrEmpty(configPath)) {
return configPath;
}
int index = configPath.LastIndexOf('/');
if (index == -1) {
return configPath;
}
Debug.Assert(index != configPath.Length - 1);
return configPath.Substring(index + 1);
}
#endif
// Avoid unused code warning in System.Configuration by including functions in assembly-specific #defines
#if CONFIGPATHUTILITY_SYSTEMWEB
static internal string GetParent(string configPath) {
Debug.Assert(String.IsNullOrEmpty(configPath) || IsValid(configPath), "String.IsNullOrEmpty(configPath) || IsValid(configPath)");
if (String.IsNullOrEmpty(configPath)) {
return null;
}
string parentConfigPath;
int lastSlash = configPath.LastIndexOf(SeparatorChar);
if (lastSlash == -1) {
parentConfigPath = null;
}
else {
parentConfigPath = configPath.Substring(0, lastSlash);
}
return parentConfigPath;
}
#endif
}
}
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