internal MimeEntity CreateEntity (ContentType contentType, IList<Header> headers, bool toplevel)
{
var args = new MimeEntityConstructorArgs (this, contentType, headers, toplevel);
var subtype = contentType.MediaSubtype.ToLowerInvariant ();
var type = contentType.MediaType.ToLowerInvariant ();
if (mimeTypes.Count > 0) {
var mimeType = string.Format ("{0}/{1}", type, subtype);
ConstructorInfo ctor;
if (mimeTypes.TryGetValue (mimeType, out ctor))
return (MimeEntity) ctor.Invoke (new object[] { args });
}
// Note: message/rfc822 and message/partial are not allowed to be encoded according to rfc2046
// (sections 5.2.1 and 5.2.2, respectively). Since some broken clients will encode them anyway,
// it is necessary for us to treat those as opaque blobs instead, and thus the parser should
// parse them as normal MimeParts instead of MessageParts.
//
// Technically message/disposition-notification is only allowed to have use the 7bit encoding
// as well, but since MessageDispositionNotification is a MImePart subclass rather than a
// MessagePart subclass, it means that the content won't be parsed until later and so we can
// actually handle that w/o any problems.
if (type == "message") {
switch (subtype) {
case "disposition-notification":
return new MessageDispositionNotification (args);
case "delivery-status":
return new MessageDeliveryStatus (args);
case "partial":
if (!IsEncoded (headers))
return new MessagePartial (args);
break;
case "external-body":
case "rfc2822":
case "rfc822":
case "news":
if (!IsEncoded (headers))
return new MessagePart (args);
break;
}
}
if (type == "multipart") {
switch (subtype) {
case "alternative":
return new MultipartAlternative (args);
case "related":
return new MultipartRelated (args);
case "report":
return new MultipartReport (args);
#if ENABLE_CRYPTO
case "encrypted":
return new MultipartEncrypted (args);
case "signed":
return new MultipartSigned (args);
#endif
default:
return new Multipart (args);
}
}
if (type == "application") {
switch (subtype) {
#if ENABLE_CRYPTO
case "x-pkcs7-signature":
case "pkcs7-signature":
return new ApplicationPkcs7Signature (args);
case "x-pgp-encrypted":
case "pgp-encrypted":
return new ApplicationPgpEncrypted (args);
case "x-pgp-signature":
case "pgp-signature":
return new ApplicationPgpSignature (args);
case "x-pkcs7-mime":
case "pkcs7-mime":
return new ApplicationPkcs7Mime (args);
#endif
case "vnd.ms-tnef":
case "ms-tnef":
return new TnefPart (args);
case "rtf":
return new TextPart (args);
}
}
if (type == "text")
return new TextPart (args);
return new MimePart (args);
}
}
