private MessageEntitySummary HandleMimeEntity(MimeEntity entity)
{
int index = 0;
return(MimeEntityVisitor.VisitWithResults <MessageEntitySummary>(entity, (e, p) =>
{
string fileName = PunyCodeReplacer.DecodePunycode(!string.IsNullOrEmpty(e.ContentDisposition?.FileName)
? e.ContentDisposition?.FileName
: e.ContentType?.Name);
MessageEntitySummary result = new MessageEntitySummary()
{
MessageId = Id,
Id = index.ToString(),
ContentId = e.ContentId,
Name = (fileName ?? e.ContentId ?? index.ToString()) + " - " + e.ContentType.MimeType,
Headers = e.Headers.Select(h => new Header {
Name = h.Field, Value = PunyCodeReplacer.DecodePunycode(h.Value)
}).ToList(),
ChildParts = new List <MessageEntitySummary>(),
Attachments = new List <AttachmentSummary>(),
Warnings = new List <MessageWarning>(),
Size = e.ToString().Length,
IsAttachment = (e.ContentDisposition?.Disposition != "inline" && !string.IsNullOrEmpty(fileName)) || e.ContentDisposition?.Disposition == "attachment",
MimeEntity = e
};
if (p != null)
{
p.ChildParts.Add(result);
if (result.IsAttachment)
{
if (e.ContentDisposition?.Disposition != "attachment")
{
result.Warnings.Add(new MessageWarning {
Details = $"Attachment '{fileName}' should have \"Content-Disposition: attachment\" header."
});
}
if (string.IsNullOrEmpty(fileName))
{
result.Warnings.Add(new MessageWarning {
Details = $"Attachment with content ID '{e.ContentId}' should have filename specified in either 'Content-Type' or 'Content-Disposition' header."
});
}
p.Attachments.Add(new AttachmentSummary()
{
Id = result.Id,
ContentId = result.ContentId,
FileName = fileName,
Url = $"api/messages/{Id}/part/{result.Id}/content"
});
}
}
index++;
return result;
}));
}
public async Task <DbModel.Message> ConvertAsync(Stream messageData, string envelopeFrom, string envelopeTo)
{
string subject = "";
string mimeParseError = null;
byte[] data = new byte[messageData.Length];
await messageData.ReadAsync(data, 0, data.Length);
bool foundHeaders = false;
bool foundSeparator = false;
using (StreamReader dataReader = new StreamReader(new MemoryStream(data)))
{
while (!dataReader.EndOfStream)
{
if (dataReader.ReadLine().Length != 0)
{
foundHeaders = true;
}
else
{
foundSeparator = true;
break;
}
}
}
if (!foundHeaders || !foundSeparator)
{
mimeParseError = "Malformed MIME message. No headers found";
}
else
{
messageData.Seek(0, SeekOrigin.Begin);
try
{
CancellationTokenSource cts = new CancellationTokenSource();
cts.CancelAfter(TimeSpan.FromSeconds(10));
MimeMessage mime = await MimeMessage.LoadAsync(messageData, true, cts.Token).ConfigureAwait(false);
subject = mime.Subject;
}
catch (OperationCanceledException e)
{
mimeParseError = e.Message;
}
catch (FormatException e)
{
mimeParseError = e.Message;
}
}
DbModel.Message message = new DbModel.Message()
{
Id = Guid.NewGuid(),
From = PunyCodeReplacer.DecodePunycode(envelopeFrom),
To = PunyCodeReplacer.DecodePunycode(envelopeTo),
ReceivedDate = DateTime.Now,
Subject = PunyCodeReplacer.DecodePunycode(subject),
Data = data,
MimeParseError = mimeParseError,
AttachmentCount = 0
};
var parts = new ApiModel.Message(message).Parts;
foreach (var part in parts)
{
message.AttachmentCount += CountAttachments(part);
}
return(message);
}
public Message(DbModel.Message dbMessage)
{
Data = dbMessage.Data;
Id = dbMessage.Id;
From = dbMessage.From;
To = dbMessage.To;
Cc = "";
Bcc = "";
ReceivedDate = dbMessage.ReceivedDate;
Subject = dbMessage.Subject;
Parts = new List <ApiModel.MessageEntitySummary>();
RelayError = dbMessage.RelayError;
if (dbMessage.MimeParseError != null)
{
MimeParseError = dbMessage.MimeParseError;
Headers = new List <Header>();
Parts = new List <MessageEntitySummary>();
}
else
{
using (MemoryStream stream = new MemoryStream(dbMessage.Data))
{
MimeMessage = MimeMessage.Load(stream);
if (MimeMessage.From != null)
{
From = MimeMessage.From.ToString();
}
List <string> recipients = new List <string>(dbMessage.To.Split(",")
.Select(r => r.Trim())
.Where(r => !string.IsNullOrEmpty(r)));
if (MimeMessage.To != null)
{
To = string.Join(", ", MimeMessage.To.Select(t => PunyCodeReplacer.DecodePunycode(t.ToString())));
foreach (MailboxAddress to in MimeMessage.To.Where(t => t is MailboxAddress))
{
recipients.Remove(PunyCodeReplacer.DecodePunycode(to.Address));
}
}
if (MimeMessage.Cc != null)
{
Cc = string.Join(", ", MimeMessage.Cc.Select(t => PunyCodeReplacer.DecodePunycode(t.ToString())));
foreach (MailboxAddress cc in MimeMessage.Cc.Where(t => t is MailboxAddress))
{
recipients.Remove(PunyCodeReplacer.DecodePunycode(cc.Address));
}
}
Bcc = string.Join(", ", recipients);
Headers = MimeMessage.Headers.Select(h => new Header {
Name = h.Field, Value = PunyCodeReplacer.DecodePunycode(h.Value)
}).ToList();
Parts.Add(HandleMimeEntity(MimeMessage.Body));
}
}
}
