/// <summary>
/// Simple wrapper around peppol-sbdh module.
/// </summary>
/// <param name="inputStream">the inputstream containing the XML</param>
/// <returns>an instance of Header if found, otherwise null.</returns>
public static Header Parse(Stream inputStream)
{
try
{
using (SbdReader sbdReader = SbdReader.NewInstance(inputStream))
{
return(sbdReader.Header);
}
}
catch (Exception ex) when(ex is SbdhException || ex is IOException)
{
throw new InvalidOperationException(ex.Message, ex);
}
finally
{
inputStream.Seek(0, SeekOrigin.Begin);
}
}
private ITransmissionMessage Perform(Stream inputStream, Trace root)
{
PeekingInputStream peekingInputStream = new PeekingInputStream(inputStream);
// Read header from content to send.
Header header;
try
{
// Read header from SBDH.
var span = root.Child();
span.Record(Annotations.ServiceName("Reading SBDH"));
span.Record(Annotations.ClientSend());
try {
using (SbdReader sbdReader = SbdReader.NewInstance(peekingInputStream))
{
header = sbdReader.Header;
span.Record(Annotations.Tag("identifier", header.Identifier.Identifier));
}
} catch (SbdhException e) {
span.Record(Annotations.Tag("exception", e.Message));
throw;
} finally {
span.Record(Annotations.ClientRecv());
}
// Create transmission request.
return(new DefaultTransmissionMessage(header, peekingInputStream.NewInputStream()));
}
catch (SbdhException)
{
byte[] payload = peekingInputStream.GetContent();
// Detect header from content.
Trace span = root.Child();
span.Record(Annotations.ServiceName("Detect SBDH from content"));
span.Record(Annotations.ClientSend());
try
{
header = this.contentDetector.Parse(payload.ToStream());
span.Record(Annotations.Tag("identifier", header.Identifier.Identifier));
}
catch (HyperwayContentException ex)
{
span.Record(Annotations.Tag("exception", ex.Message));
throw new HyperwayContentException(ex.Message, ex);
}
finally
{
span.Record(Annotations.ClientRecv());
}
// Wrap content in SBDH.
span = root.Child();
span.Record(Annotations.ServiceName("Wrap content in SBDH"));
span.Record(Annotations.ClientSend());
Stream wrappedContent;
try
{
wrappedContent = this.contentWrapper.Wrap(payload.ToStream(), header);
}
catch (HyperwayContentException ex)
{
span.Record(Annotations.Tag("exception", ex.Message));
throw;
}
finally
{
span.Record(Annotations.ClientRecv());
}
// Create transmission request.
return(new DefaultTransmissionMessage(header, wrappedContent));
}
}
/// <summary>
/// Receives an AS2 Message in the form of a map of headers together with the payload,
/// which is made available in an input stream
/// <p>If persisting message to the Message Repository fails, we have to return negative MDN.</p>
/// </summary>
/// <param name="httpHeaders">the http headers received</param>
/// <param name="mimeMessage">supplies the MIME message</param>
/// <returns>MDN object to signal if everything is ok or if some error occurred while receiving</returns>
public MimeMessage Receive(IHeaderDictionary httpHeaders, MimeMessage mimeMessage)
{
Logger.Debug("Receiving message ..");
SMimeReader sMimeReader = new SMimeReader(mimeMessage);
// Get timestamp using signature as input
Timestamp t2 = this.timestampProvider.Generate(sMimeReader.GetSignature(), Direction.IN);
// Initiate MDN
MdnBuilder mdnBuilder = MdnBuilder.NewInstance(mimeMessage);
mdnBuilder.AddHeader(MdnHeader.Date, t2.GetDate());
// Extract Message-ID
TransmissionIdentifier transmissionIdentifier =
TransmissionIdentifier.FromHeader(httpHeaders[As2Header.MessageId]);
mdnBuilder.AddHeader(MdnHeader.OriginalMessageId, httpHeaders[As2Header.MessageId]);
// Extract signed digest and digest algorithm
SMimeDigestMethod digestMethod = sMimeReader.GetDigestMethod();
// Extract content headers
byte[] headerBytes = sMimeReader.GetBodyHeader();
Stream bodyStream = sMimeReader.GetBodyInputStream();
byte[] bodyBytes = bodyStream.ToBuffer();
mdnBuilder.AddHeader(MdnHeader.OriginalContentHeader, headerBytes);
// Extract SBDH
Mx.Peppol.Common.Model.Header header;
bodyStream.Seek(0, SeekOrigin.Begin);
using (var sbdReader = SbdReader.NewInstance(bodyStream))
{
header = sbdReader.Header;
// Perform validation of SBDH
this.transmissionVerifier.Verify(header, Direction.IN);
// Extract "fresh" InputStream
using (Stream payloadInputStream = sMimeReader.GetBodyInputStream())
{
// Persist content
this.persisterHandler.Persist(
transmissionIdentifier,
header,
new UnclosableInputStream(payloadInputStream));
}
// Fetch calculated digest
var s = SHA1.Create();
var hash = s.ComputeHash(headerBytes.Concat(bodyBytes).ToArray());
Digest calculatedDigest = Digest.Of(DigestMethod.Sha1, hash);
mdnBuilder.AddHeader(MdnHeader.ReceivedContentMic, new Mic(calculatedDigest));
var check = this.VerifySignature(mimeMessage.Body as MultipartSigned, out var signatures);
if (!check || signatures.Count != 1)
{
throw new NotSupportedException("Firma non valida");
}
var signature = signatures[0];
var certificate = signature.SignerCertificate as SecureMimeDigitalCertificate;
Debug.Assert(certificate != null, nameof(certificate) + " != null");
this.certificateValidator.Validate(Service.Ap, certificate.Certificate);
// Create receipt (MDN)
mdnBuilder.AddHeader(MdnHeader.Disposition, Disposition.Processed);
MimeMessage mdn = this.sMimeMessageFactory.CreateSignedMimeMessage(mdnBuilder.Build(), digestMethod);
mdn.Headers.Add(As2Header.As2Version, As2Header.Version);
mdn.Headers.Add(As2Header.As2From, httpHeaders[As2Header.As2To]);
mdn.Headers.Add(As2Header.As2To, httpHeaders[As2Header.As2From]);
return(mdn);
}
}
