public void TestGetHeaderValue()
{
List<string> headers = new List<string>();
headers.Add("Colour: Grey");
headers.Add("Year:1985");
headers.Add("Current: 1.21 gigawatts");
headers.Add("SomeOtherField:");
headers.Add("InvalidField > Invalid because the separator is not a colon");
headers.Add("BlackMesa:4:4:2");
string fileHeaderValue = string.Join(Environment.NewLine, headers.ToArray());
HeaderParser parser = new HeaderParser(fileHeaderValue);
Assert.AreEqual( " Grey", parser.GetHeaderValue( "colour" ));
Assert.AreEqual( " Grey", parser.GetHeaderValue( "Colour" ));
Assert.AreEqual(" 1.21 gigawatts", parser.GetHeaderValue("Current"));
Assert.AreEqual("1985", parser.GetHeaderValue("Year"));
Assert.AreEqual( string.Empty, parser.GetHeaderValue("SomeOtherField"));
Assert.AreEqual("4:4:2", parser.GetHeaderValue("BlackMesa"));
Assert.IsNull( parser.GetHeaderValue("InvalidField"));
}
/// <summary>
/// This method checks a certain property is present in the FileHeaders property, and that the value matches
/// a hash of some request-specific properties.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
/// <remarks>
/// Only expect this to be true for messages that were processed by Protect on the client, and then picked up at another
/// egress point such as the MTA or Network monitor.
/// Only messages processed by protect client will have the prerequisite fileheader property.
///</remarks>
private static bool VerifyRequest(Request request)
{
try
{
if (request == null || request.Properties == null)
{
return false;
}
CustomProperty fileHeaderProperty = Array.Find(request.Properties,
cp => cp.Name.Equals("FileHeader", StringComparison.InvariantCultureIgnoreCase));
if (fileHeaderProperty == null || string.IsNullOrEmpty(fileHeaderProperty.Value))
{
return false;
}
HeaderParser parser = new HeaderParser(fileHeaderProperty.Value);
string actualValue = parser.GetHeaderValue(RequestDigestProvider.XHEADER_MESSAGE_PROTECTED);
if (string.IsNullOrEmpty(actualValue))
{
return false;
}
actualValue = actualValue.Trim();
string expectedHashValue = new RequestDigestProvider().GetDigest(request);
if (!actualValue.Equals(expectedHashValue, StringComparison.InvariantCultureIgnoreCase))
{
Logger.LogInfo("A request failed hash validation. It will be processed by all policies. FileHeader contents: " + fileHeaderProperty.Value);
return false;
}
Logger.LogInfo("Request passed hash validation, therefore it was sent via a Protect-compatible email client.");
return true;
}
catch (Exception e)
{
//Some requests passed in here will currently pass unexpected arguments, namely the NetworkMonitor.
//NetMon code is currently passing an unexpected number of routing items.
//In all cases where unexpected arguments are passed or any other problem is encountered,
//treat this as failure to verify the message, therefore returning false.
Logger.LogError("A request failed hash validation due to an exception. It will be processed by all policies.");
Logger.LogError(e);
return false;
}
}
