adamlith/attributed

Use attributes to control how complex types are logged to Serilog.

Destructurama.Attributed

This package makes it possible to manipulate how objects are logged to Serilog using attributes.

Enabling the module:

Install from NuGet:

Install-Package Destructurama.Attributed

Modify logger configuration:

var log = new LoggerConfiguration()
  .Destructure.UsingAttributes()
  ...

Ignoring a property

Apply the NotLogged attribute:

public class LoginCommand
{
  public string Username { get; set; }

  [NotLogged]
  public string Password { get; set; }
}

When the object is passed using {@...} syntax the attributes will be consulted.

var command = new LoginCommand { Username = "logged", Password = "not logged" };
log.Information("Logging in {@Command}", command);

Treating types and properties as scalars

To prevent destructuring of a type or property at all, apply the [LoggedAsScalar] attribute.

Masking a string property

Apply the LogMasked attribute with various settings:

• Text: If set the properties value will be set to this text.
• ShowFirst: Shows the first x characters in the property value
• ShowLast: Shows the last x characters in the property value
• PreserveLength: If set it will swap out each character with the default value. Note that this property will be ignored if Text has been set to custom value.

Examples

public class Creditcard
{
  /// <summary>
  /// 123456789 results in "*********"
  /// </summary>
  [LogMasked]
  public string DefaultMasked { get; set; }
  
  /// <summary>
  ///  123456789 results in "REMOVED"
  /// </summary>
  [LogMasked(Text="REMOVED")]
  public string CustomMasked { get; set; }
  
  /// <summary>
  ///  123456789 results in "123***"
  /// </summary>
  [LogMasked(ShowFirst=3)]
  public string ShowFirstThreeThenDefaultMasked { get; set; }

  /// <summary>
  ///  123456789 results in "123******"
  /// </summary>
  [LogMasked(ShowFirst=3, PreserveLength=true)]
  public string ShowFirstThreeThenDefaultMaskedPreserveLength { get; set; }

  /// <summary>
  /// 123456789 results in "***789"
  /// </summary>
  [LogMasked(ShowLast=3)]
  public string ShowLastThreeThenDefaultMasked { get; set; }
  
  /// <summary>
  /// 123456789 results in "******789"
  /// </summary>
  [LogMasked(ShowLast=3, PreserveLength=true)]
  public string ShowLastThreeThenDefaultMaskedPreserveLength  { get; set; }

  /// <summary>
  ///  123456789 results in "123REMOVED"
  /// </summary>
  [LogMasked(Text="REMOVED", ShowFirst=3)]
  public string ShowFirstThreeThenCustomMask { get; set; }

  /// <summary>
  ///  123456789 results in "REMOVED789"
  /// </summary>
  [LogMasked(Text="REMOVED", ShowLast=3)]
  public string ShowLastThreeThenCustomMask { get; set; }
  
  /// <summary>
  ///  123456789 results in "******789"
  /// </summary>
  [LogMasked(ShowLast=3, PreserveLength=true)]
  public string ShowLastThreeThenCustomMaskPreserveLength { get; set; }

  /// <summary>
  ///  123456789 results in "123******"
  /// </summary>
  [LogMasked(ShowFirst=3, PreserveLength=true)]
  public string ShowFirstThreeThenCustomMaskPreserveLength { get; set; }

  /// <summary>
  /// 123456789 results in "123***789"
  /// </summary>
  [LogMasked(ShowFirst=3, ShowLast=3)]
  public string ShowFirstAndLastThreeAndDefaultMaskeInTheMiddle { get; set; }

  /// <summary>
  ///  123456789 results in "123REMOVED789"
  /// </summary>
  [LogMasked(Text="REMOVED", ShowFirst=3, ShowLast=3)]
  public string ShowFirstAndLastThreeAndCustomMaskInTheMiddle { get; set; }

  /// <summary>
  ///  NOTE PreserveLength=true is ignored in this case
  ///  123456789 results in "123REMOVED789"
  /// </summary>
  [LogMasked(Text="REMOVED", ShowFirst=3, ShowLast=3, PreserveLength=true)]
  public string ShowFirstAndLastThreeAndCustomMaskInTheMiddle { get; set; }
}