public object Create(object parent, object configContext, XmlNode section)
{
object result = parent;
XmlNode fileAttribute = section.Attributes.RemoveNamedItem("file");
if (fileAttribute == null && fileAttribute.Value.Length == 0)
{
return(new NameValueSectionHandler().Create(result, null, section));
}
IConfigErrorInfo configXmlNode = fileAttribute as IConfigErrorInfo;
if (configXmlNode == null)
{
return(null);
}
string directory = Path.GetDirectoryName(configXmlNode.Filename);
string absoluteFilePath = Path.GetFullPath(directory + fileAttribute.Value);
if (!File.Exists(absoluteFilePath))
{
throw new ConfigurationErrorsException(string.Format("external config file: {0} does not exists", absoluteFilePath));
}
var configXmlDocument = new ConfigXmlDocument();
try
{
configXmlDocument.Load(absoluteFilePath);
}
catch (XmlException e)
{
throw new ConfigurationErrorsException(e.Message, e, absoluteFilePath, e.LineNumber);
}
if (section.Name != configXmlDocument.DocumentElement.Name)
{
throw new ConfigurationErrorsException(string.Format("Section name '{0}' in app.config does not match section name '{1}' in file '{2}'", section.Name, configXmlDocument.DocumentElement.Name, absoluteFilePath));
}
var nodeToDecrypt = configXmlDocument.DocumentElement["EncryptedData"];
if (nodeToDecrypt == null)
{
throw new ConfigurationErrorsException(string.Format("External encrypted file {0} does not contain EncryptedData element", absoluteFilePath));
}
var protectionProvider = new DpapiProtectedConfigurationProvider();
var decryptedConfigSection = protectionProvider.Decrypt(nodeToDecrypt);
result = new NameValueSectionHandler().Create(result, null, decryptedConfigSection);
return(result);
}
public WebConfigEncryption()
{
_provider = new DpapiProtectedConfigurationProvider();
_encryptTextMethod = _provider.GetType().GetMethod("EncryptText", BindingFlags.Instance | BindingFlags.NonPublic);
_decryptTextMethod = _provider.GetType().GetMethod("DecryptText", BindingFlags.Instance | BindingFlags.NonPublic);
}
