public Stream NormaliseStream(MimePart mimePart)
{
string contentType = _contentTypeProvider.GetContentType(mimePart);
switch (contentType)
{
case ContentType.ApplicationGzip:
return(Decompress(mimePart, _gZipDecompressor, _zipDecompressor));
case ContentType.ApplicationXZipCompressed:
case ContentType.ApplicationZip:
return(Decompress(mimePart, _zipDecompressor, _gZipDecompressor));
case ContentType.ApplicationOctetStream:
string extension = Path.GetExtension(mimePart.FileName.Split('!').LastOrDefault());
if (extension?.StartsWith(".z") ?? false)
{
return(Decompress(mimePart, _zipDecompressor, _gZipDecompressor));
}
return(Decompress(mimePart, _gZipDecompressor, _zipDecompressor));
case ContentType.TextXml:
return(mimePart.GetDecodedStream());
default:
return(Stream.Null);
}
}
private Stream Decompress(MimePart mimePart, params IDecompressor[] decompressors)
{
foreach (var decompressor in decompressors)
{
try
{
using (Stream decodedStream = mimePart.GetDecodedStream())
{
Stream decompressedStream = decompressor.Decompress(decodedStream);
_log.Info(
$"Successfully decompressed {mimePart.FileName ?? "<null>"} as {decompressor.StreamType}.");
return(decompressedStream);
}
}
catch (Exception)
{
_log.Info($"Failed to decompress {mimePart.FileName ?? "<null>"} as {decompressor.StreamType}.");
}
}
return(Stream.Null);
}