/// <summary>
/// Adds a random padding as an http header to the response.
/// </summary>
public override void OnResultExecuting(ResultExecutingContext context)
{
base.OnResultExecuting(context);
string resultString = string.Empty;
// Only works for object results
if (context.Result is ObjectResult objectResult && objectResult.Value is string objectResultString)
{
resultString = objectResultString;
}
// Nothing needs doing if we're above the minimum length
if (resultString.Length >= _Config.ByteCountMinimum)
{
_Logger.WriteNoPaddingNeeded(resultString.Length, _Config.ByteCountMinimum);
return;
}
// Calculate length of padding to add
var paddingLength = _Rng.Next(_Config.ByteCountMinimum, _Config.ByteCountMaximum) - resultString.Length;
_Logger.WriteLengthOfResponsePadding(paddingLength);
// Get the padding bytes
var padding = _PaddingGenerator.Generate(paddingLength);
_Logger.WritePaddingContent(padding);
// Add padding here
context.HttpContext.Response.Headers.Add(PaddingHeader, padding);
_Logger.WritePaddingAdded();
}
/// <summary>
/// Adds a random padding as an http header to the response.
/// </summary>
public override void OnResultExecuting(ResultExecutingContext context)
{
base.OnResultExecuting(context);
string resultString = string.Empty;
// Only works for object results
if (context.Result is ObjectResult objectResult && objectResult.Value is string objectResultString)
{
resultString = objectResultString;
}
// Nothing needs doing if we're above the minimum length
if (resultString.Length >= _Config.MinimumLengthInBytes)
{
_Logger.LogInformation("No padding needed as response length of {Length} is greater than the minimum of {MinimumLengthInBytes}..",
resultString.Length, _Config.MinimumLengthInBytes);
return;
}
// Calculate length of padding to add
var paddingLength = _Rng.Next(_Config.MinimumLengthInBytes, _Config.MaximumLengthInBytes) - resultString.Length;
_Logger.LogInformation("Length of response padding: {PaddingLength}", paddingLength);
// Get the padding bytes
var padding = _PaddingGenerator.Generate(paddingLength);
_Logger.LogDebug("Response padding: {Padding}", padding);
// Add padding here
context.HttpContext.Response.Headers.Add(PaddingHeader, padding);
_Logger.LogInformation("Added padding to the response.");
}