public void Encrypt <TProperty>(Expression <Func <T, TProperty> > expression)
{
MemberExpression member = expression.Body as MemberExpression;
if (member == null)
{
throw new ArgumentException($"Expression '{expression}' refers to a method, not a property.");
}
PropertyInfo propInfo = member.Member as PropertyInfo;
if (propInfo == null)
{
throw new ArgumentException($"Expression '{expression}' refers to a field, not a property.");
}
if (Type != propInfo.DeclaringType && propInfo.DeclaringType != null &&
!Type.GetTypeInfo().IsSubclassOf(propInfo.DeclaringType))
{
throw new ArgumentException(
$"Expresion '{expression}' refers to a property that is not from type {Type}.");
}
PropertiesToEncrypt.Add(propInfo.Name);
}
/// <summary>
/// Encrypts all the fields in the current object based on the EncryptFieldList
/// </summary>
/// <returns></returns>
public virtual void EncryptFields(AppConfiguration config)
{
if (string.IsNullOrEmpty(PropertiesToEncrypt))
{
return;
}
MemberInfo[] mi = config.GetType().FindMembers(MemberTypes.Property | MemberTypes.Field,
ReflectionUtils.MemberAccess, null, null);
string encryptFieldList = "," + PropertiesToEncrypt.ToLower() + ",";
foreach (MemberInfo Member in mi)
{
string FieldName = Member.Name.ToLower();
// Encrypt the field if in list
if (encryptFieldList.Contains("," + FieldName + ","))
{
object val = string.Empty;
if (Member.MemberType == MemberTypes.Field)
{
val = ((FieldInfo)Member).GetValue(config);
}
else
{
val = ((PropertyInfo)Member).GetValue(config, null);
}
if (val == null || !(val is string))
{
continue;
}
var strVal = val as string;
if (string.IsNullOrEmpty(strVal))
{
continue;
}
val = Encryption.EncryptString(strVal, EncryptionKey);
if (Member.MemberType == MemberTypes.Field)
{
((FieldInfo)Member).SetValue(config, val);
}
else
{
((PropertyInfo)Member).SetValue(config, val, null);
}
}
}
}
/// <summary>
/// Internally decryptes all the fields in the current object based on the EncryptFieldList
/// </summary>
/// <returns></returns>
public virtual void DecryptFields(AppConfiguration config)
{
if (string.IsNullOrEmpty(PropertiesToEncrypt))
{
return;
}
string encryptFieldList = "," + PropertiesToEncrypt.ToLower() + ",";
string[] fieldTokens = encryptFieldList.Split(new char[1] {
','
}, StringSplitOptions.RemoveEmptyEntries);
foreach (string fieldName in fieldTokens)
{
// Encrypt the field if in list
if (encryptFieldList.Contains("," + fieldName.ToLower() + ","))
{
object val = string.Empty;
try
{
val = ReflectionUtils.GetPropertyEx(config, fieldName);
}
catch
{
throw new ArgumentException(string.Format("{0}: {1}", Resources.InvalidEncryptionPropertyName, fieldName));
}
// only encrypt string values
var strVal = val as string;
if (string.IsNullOrEmpty(strVal))
{
continue;
}
val = Encryption.DecryptString(strVal, EncryptionKey);
try
{
ReflectionUtils.SetPropertyEx(config, fieldName, val);
}
catch
{
throw new ArgumentException(string.Format("{0}: {1}", Resources.InvalidEncryptionPropertyName, fieldName));
}
}
}
}
private void WriteConfigurationValue(string keyName, string Value, MemberInfo Field, XmlDocument Dom, string ConfigSection)
{
string fieldsToEncrypt = "," + PropertiesToEncrypt.ToLower() + ",";
// Encrypt the field if in list
if (fieldsToEncrypt.IndexOf("," + Field.Name.ToLower() + ",") > -1)
{
Value = Encryption.EncryptString(Value, EncryptionKey);
}
XmlNode Node = Dom.DocumentElement.SelectSingleNode(
XmlNamespacePrefix + ConfigSection + "/" +
XmlNamespacePrefix + "add[@key='" + keyName + "']", XmlNamespaces);
if (Node == null)
{
// Create the node and attributes and write it
Node = Dom.CreateNode(XmlNodeType.Element, "add", Dom.DocumentElement.NamespaceURI);
XmlAttribute Attr2 = Dom.CreateAttribute("key");
Attr2.Value = keyName;
XmlAttribute Attr = Dom.CreateAttribute("value");
Attr.Value = Value;
Node.Attributes.Append(Attr2);
Node.Attributes.Append(Attr);
XmlNode Parent = Dom.DocumentElement.SelectSingleNode(
XmlNamespacePrefix + ConfigSection, XmlNamespaces);
if (Parent == null)
{
Parent = CreateConfigSection(Dom, ConfigSection);
}
Parent.AppendChild(Node);
}
else
{
// just write the value into the attribute
Node.Attributes.GetNamedItem("value").Value = Value;
}
}
/// <summary>
/// Internally decryptes all the fields in the current object based on the EncryptFieldList
/// </summary>
/// <returns></returns>
public virtual void DecryptFields(AppConfiguration config)
{
if (string.IsNullOrEmpty(PropertiesToEncrypt))
{
return;
}
MemberInfo[] mi = config.GetType().FindMembers(MemberTypes.Property | MemberTypes.Field,
ReflectionUtils.MemberAccess, null, null);
string encryptFieldList = "," + PropertiesToEncrypt.ToLower() + ",";
foreach (MemberInfo Member in mi)
{
string FieldName = Member.Name.ToLower();
// Encrypt the field if in list
if (encryptFieldList.IndexOf("," + FieldName + ",") > -1)
{
object Value = string.Empty;
if (Member.MemberType == MemberTypes.Field)
{
Value = ((FieldInfo)Member).GetValue(config);
}
else
{
Value = ((PropertyInfo)Member).GetValue(config, null);
}
Value = Encryption.DecryptString((string)Value, EncryptionKey);
if (Member.MemberType == MemberTypes.Field)
{
((FieldInfo)Member).SetValue(config, Value);
}
else
{
((PropertyInfo)Member).SetValue(config, Value, null);
}
}
}
}
/// <summary>
/// Reads Configuration settings from an external file or explicitly from a file.
/// Uses XML DOM to read values instead of using the native APIs.
/// </summary>
/// <typeparam name="TAppConfiguration"></typeparam>
/// <param name="config">Configuration instance</param>
/// <param name="filename">Filename to read from</param>
/// <returns></returns>
public override bool Read(AppConfiguration config, string filename)
{
Type typeWebConfig = config.GetType();
MemberInfo[] Fields = typeWebConfig.GetMembers(BindingFlags.Public |
BindingFlags.Instance);
// Set a flag for missing fields
// If we have any we'll need to write them out
bool missingFields = false;
XmlDocument Dom = new XmlDocument();
try
{
Dom.Load(filename);
}
catch
{
// Can't open or doesn't exist - so try to create it
if (!Write(config))
{
return(false);
}
// Now load again
Dom.Load(filename);
}
// Retrieve XML Namespace information to assign default
// Namespace explicitly.
GetXmlNamespaceInfo(Dom);
string ConfigSection = ConfigurationSection;
if (ConfigSection == string.Empty)
{
ConfigSection = "appSettings";
}
string fieldsToEncrypt = "," + PropertiesToEncrypt.ToLower() + ",";
foreach (MemberInfo Member in Fields)
{
FieldInfo Field = null;
PropertyInfo Property = null;
Type FieldType = null;
string TypeName = null;
if (Member.MemberType == MemberTypes.Field)
{
Field = (FieldInfo)Member;
FieldType = Field.FieldType;
TypeName = Field.FieldType.Name.ToLower();
}
else if (Member.MemberType == MemberTypes.Property)
{
Property = (PropertyInfo)Member;
FieldType = Property.PropertyType;
TypeName = Property.PropertyType.Name.ToLower();
}
else
{
continue;
}
string Fieldname = Member.Name;
if (Fieldname == "Provider" || Fieldname == "ErrorMessage")
{
continue;
}
XmlNode Section = Dom.DocumentElement.SelectSingleNode(XmlNamespacePrefix + ConfigSection, XmlNamespaces);
if (Section == null)
{
Section = CreateConfigSection(Dom, ConfigurationSection);
Dom.DocumentElement.AppendChild(Section);
}
string Value = GetNamedValueFromXml(Dom, Fieldname, ConfigSection);
if (Value == null)
{
missingFields = true;
continue;
}
Fieldname = Fieldname.ToLower();
// If we're encrypting decrypt any field that are encyrpted
if (Value != string.Empty && fieldsToEncrypt.IndexOf("," + Fieldname + ",") > -1)
{
Value = Encryption.DecryptString(Value, EncryptionKey);
}
// Assign the Property
ReflectionUtils.SetPropertyEx(config, Fieldname,
StringToTypedValue(Value, FieldType, CultureInfo.InvariantCulture));
}
// We have to write any missing keys
if (missingFields)
{
Write(config);
}
return(true);
}
/// <summary>
/// Reads configuration settings from the current configuration manager.
/// Uses the internal APIs to write these values.
/// </summary>
/// <typeparam name="TAppConfiguration"></typeparam>
/// <param name="config"></param>
/// <returns></returns>
public override bool Read(AppConfiguration config)
{
// Config reading from external files works a bit differently
// so use a separate method to handle it
if (!string.IsNullOrEmpty(ConfigurationFile))
{
return(Read(config, ConfigurationFile));
}
Type typeWebConfig = config.GetType();
MemberInfo[] Fields =
typeWebConfig.GetMembers(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty |
BindingFlags.GetField);
// Set a flag for missing fields
// If we have any we'll need to write them out into .config
bool missingFields = false;
string fieldsToEncrypt = "," + PropertiesToEncrypt.ToLower() + ",";
// Refresh the sections - req'd after write operations
// sometimes sections don't want to re-read
if (string.IsNullOrEmpty(ConfigurationSection))
{
ConfigurationManager.RefreshSection("appSettings");
}
else
{
ConfigurationManager.RefreshSection(ConfigurationSection);
}
NameValueCollection configManager;
configManager = string.IsNullOrEmpty(ConfigurationSection)
? ConfigurationManager.AppSettings as NameValueCollection
: ConfigurationManager.GetSection(ConfigurationSection) as NameValueCollection;
if (configManager == null)
{
Write(config);
return(true);
}
// Loop through all fields and properties
foreach (MemberInfo Member in Fields)
{
FieldInfo field = null;
PropertyInfo property = null;
Type fieldType = null;
if (Member.MemberType == MemberTypes.Field)
{
field = (FieldInfo)Member;
fieldType = field.FieldType;
}
else if (Member.MemberType == MemberTypes.Property)
{
property = (PropertyInfo)Member;
fieldType = property.PropertyType;
}
else
{
continue;
}
string fieldName = Member.Name.ToLower();
// Error Message is an internal public property
if (fieldName == "errormessage" || fieldName == "provider")
{
continue;
}
if (!IsIList(fieldType))
{
// Single value
string value = configManager[fieldName];
if (value == null)
{
missingFields = true;
continue;
}
// If we're encrypting decrypt any field that are encyrpted
if (value != string.Empty && fieldsToEncrypt.IndexOf("," + fieldName + ",") > -1)
{
value = Encryption.DecryptString(value, EncryptionKey);
}
try
{
// Assign the value to the property
ReflectionUtils.SetPropertyEx(config, Member.Name,
StringToTypedValue(value, fieldType, CultureInfo.InvariantCulture));
}
catch
{
}
}
else
{
// List Value
var list = Activator.CreateInstance(fieldType) as IList;
var elType = fieldType.GetElementType();
if (elType == null)
{
var generic = fieldType.GetGenericArguments();
if (generic != null && generic.Length > 0)
{
elType = generic[0];
}
}
int count = 1;
string value = string.Empty;
while (value != null)
{
value = configManager[fieldName + count];
if (value == null)
{
break;
}
list.Add(StringToTypedValue(value, elType, CultureInfo.InvariantCulture));
count++;
}
try
{
ReflectionUtils.SetPropertyEx(config, Member.Name, list);
}
catch { }
}
}
// We have to write any missing keys
if (missingFields)
{
Write(config);
}
return(true);
}
bool IExtendedXmlSerializerConfig.CheckPropertyEncryption(string propertyName)
{
return(PropertiesToEncrypt.Contains(propertyName));
}
public override bool Write(AppConfiguration config)
{
lock (syncWriteLock)
{
// Load the config file into DOM parser
XmlDocument Dom = new XmlDocument();
string configFile = ConfigurationFile;
if (string.IsNullOrEmpty(configFile))
{
configFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
}
try
{
Dom.Load(configFile);
}
catch
{
// Can't load the file - create an empty document
string Xml =
@"<?xml version='1.0'?>
<configuration>
</configuration>" ;
Dom.LoadXml(Xml);
}
// Load up the Namespaces object so we can
// reference the appropriate default namespace
GetXmlNamespaceInfo(Dom);
// Parse through each of hte properties of the properties
Type typeWebConfig = config.GetType();
MemberInfo[] Fields = typeWebConfig.GetMembers(BindingFlags.Instance | BindingFlags.GetField | BindingFlags.GetProperty | BindingFlags.Public);
string fieldsToEncrypt = "," + PropertiesToEncrypt.ToLower() + ",";
string ConfigSection = "appSettings";
if (!string.IsNullOrEmpty(ConfigurationSection))
{
ConfigSection = ConfigurationSection;
}
ConfigurationManager.RefreshSection(ConfigSection);
foreach (MemberInfo Field in Fields)
{
// If we can't find the key - write it out to the document
string Value = null;
object RawValue = null;
if (Field.MemberType == MemberTypes.Field)
{
RawValue = ((FieldInfo)Field).GetValue(config);
}
else if (Field.MemberType == MemberTypes.Property)
{
RawValue = ((PropertyInfo)Field).GetValue(config, null);
}
else
{
continue; // not a property or field
}
// Don't persist ErrorMessage property
if (Field.Name == "ErrorMessage" || Field.Name == "Provider")
{
continue;
}
Value = ReflectionUtils.TypedValueToString(RawValue, CultureInfo.InvariantCulture);
// Encrypt the field if in list
if (fieldsToEncrypt.IndexOf("," + Field.Name.ToLower() + ",") > -1)
{
Value = Encryption.EncryptString(Value, EncryptionKey);
}
XmlNode Node = Dom.DocumentElement.SelectSingleNode(
XmlNamespacePrefix + ConfigSection + "/" +
XmlNamespacePrefix + "add[@key='" + Field.Name + "']", XmlNamespaces);
if (Node == null)
{
// Create the node and attributes and write it
Node = Dom.CreateNode(XmlNodeType.Element, "add", Dom.DocumentElement.NamespaceURI);
XmlAttribute Attr2 = Dom.CreateAttribute("key");
Attr2.Value = Field.Name;
XmlAttribute Attr = Dom.CreateAttribute("value");
Attr.Value = Value;
Node.Attributes.Append(Attr2);
Node.Attributes.Append(Attr);
XmlNode Parent = Dom.DocumentElement.SelectSingleNode(
XmlNamespacePrefix + ConfigSection, XmlNamespaces);
if (Parent == null)
{
Parent = CreateConfigSection(Dom, ConfigSection);
}
Parent.AppendChild(Node);
}
else
{
// just write the value into the attribute
Node.Attributes.GetNamedItem("value").Value = Value;
}
string XML = Node.OuterXml;
} // for each
try
{
// this will fail if permissions are not there
Dom.Save(configFile);
ConfigurationManager.RefreshSection(ConfigSection);
}
catch
{
return(false);
}
}
return(true);
}
/// <summary>
/// Reads configuration settings from the current configuration manager.
/// Uses the internal APIs to write these values.
/// </summary>
/// <typeparam name="TAppConfiguration"></typeparam>
/// <param name="config"></param>
/// <returns></returns>
public override bool Read(AppConfiguration config)
{
// Config reading from external files works a bit differently
// so use a separate method to handle it
if (!string.IsNullOrEmpty(ConfigurationFile))
{
return(Read(config, ConfigurationFile));
}
Type typeWebConfig = config.GetType();
MemberInfo[] Fields = typeWebConfig.GetMembers(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.GetField);
// Set a flag for missing fields
// If we have any we'll need to write them out into .config
bool missingFields = false;
string fieldsToEncrypt = "," + PropertiesToEncrypt.ToLower() + ",";
// Refresh the sections - req'd after write operations
// sometimes sections don't want to re-read
if (string.IsNullOrEmpty(ConfigurationSection))
{
ConfigurationManager.RefreshSection("appSettings");
}
else
{
ConfigurationManager.RefreshSection(ConfigurationSection);
}
// Loop through all fields and properties
foreach (MemberInfo Member in Fields)
{
string typeName = null;
FieldInfo field = null;
PropertyInfo property = null;
Type fieldType = null;
if (Member.MemberType == MemberTypes.Field)
{
field = (FieldInfo)Member;
fieldType = field.FieldType;
typeName = fieldType.Name.ToLower();
}
else if (Member.MemberType == MemberTypes.Property)
{
property = (PropertyInfo)Member;
fieldType = property.PropertyType;
typeName = fieldType.Name.ToLower();
}
else
{
continue;
}
string fieldName = Member.Name.ToLower();
// Error Message is an internal public property
if (fieldName == "errormessage" || fieldName == "provider")
{
continue;
}
string value = null;
if (string.IsNullOrEmpty(ConfigurationSection))
{
value = ConfigurationManager.AppSettings[fieldName];
}
else
{
NameValueCollection Values =
ConfigurationManager.GetSection(ConfigurationSection) as NameValueCollection;
if (Values != null)
{
value = Values[fieldName];
}
}
if (value == null)
{
missingFields = true;
continue;
}
// If we're encrypting decrypt any field that are encyrpted
if (value != string.Empty && fieldsToEncrypt.IndexOf("," + fieldName + ",") > -1)
{
value = Encryption.DecryptString(value, EncryptionKey);
}
try
{
// Assign the value to the property
ReflectionUtils.SetPropertyEx(config, fieldName,
ReflectionUtils.StringToTypedValue(value, fieldType, CultureInfo.InvariantCulture));
}
catch {; }
}
// We have to write any missing keys
if (missingFields)
{
Write(config);
}
return(true);
}
