/// <summary>
/// Glue method to create a bodypart from a MIMEPart instance.
/// </summary>
/// <param name="mimePart">The MIMEPart instance to create the
/// bodypart instance from.</param>
/// <returns>An initialized instance of the Bodypart class.</returns>
private static Bodypart BodypartFromMIME(MIMEPart mimePart) {
NameValueCollection contentType = ParseMIMEField(
mimePart.header["Content-Type"]);
Bodypart p = new Bodypart(null);
Match m = Regex.Match(contentType["value"], "(.+)/(.+)");
if (m.Success) {
p.Type = ContentTypeMap.fromString(m.Groups[1].Value);
p.Subtype = m.Groups[2].Value;
}
p.Encoding = ContentTransferEncodingMap.fromString(
mimePart.header["Content-Transfer-Encoding"]);
p.Id = mimePart.header["Content-Id"];
foreach (string k in contentType.AllKeys)
p.Parameters.Add(k, contentType[k]);
p.Size = mimePart.body.Length;
if (mimePart.header["Content-Disposition"] != null) {
NameValueCollection disposition = ParseMIMEField(
mimePart.header["Content-Disposition"]);
p.Disposition.Type = ContentDispositionTypeMap.fromString(
disposition["value"]);
p.Disposition.Filename = disposition["Filename"];
foreach (string k in disposition.AllKeys)
p.Disposition.Attributes.Add(k, disposition[k]);
}
return p;
}
/// <summary>
/// Creates an instance of the Attachment class used by the MailMessage class
/// to store mail message attachments.
/// </summary>
/// <param name="part">The MIME body part to create the attachment from.</param>
/// <param name="bytes">An array of bytes composing the content of the
/// attachment</param>
/// <returns>An initialized instance of the Attachment class</returns>
private static Attachment CreateAttachment(Bodypart part, byte[] bytes) {
MemoryStream stream = new MemoryStream(bytes);
string name = part.Disposition.Filename ?? Path.GetRandomFileName();
Attachment attachment = new Attachment(stream, name);
try {
attachment.ContentId = ParseMessageId(part.Id);
} catch {}
try {
attachment.ContentType = new System.Net.Mime.ContentType(
part.Type.ToString().ToLower() + "/" + part.Subtype.ToLower());
} catch {
attachment.ContentType = new System.Net.Mime.ContentType();
}
return attachment;
}
/// <summary>
/// Creates an instance of the AlternateView class used by the MailMessage class
/// to store alternate views of the mail message's content.
/// </summary>
/// <param name="part">The MIME body part to create the alternate view from.</param>
/// <param name="bytes">An array of bytes composing the content of the
/// alternate view</param>
/// <returns>An initialized instance of the AlternateView class</returns>
private static AlternateView CreateAlternateView(Bodypart part, byte[] bytes) {
MemoryStream stream = new MemoryStream(bytes);
System.Net.Mime.ContentType contentType;
try {
contentType = new System.Net.Mime.ContentType(
part.Type.ToString().ToLower() + "/" + part.Subtype.ToLower());
} catch {
contentType = new System.Net.Mime.ContentType();
}
AlternateView view = new AlternateView(stream, contentType);
try {
view.ContentId = ParseMessageId(part.Id);
} catch {}
return view;
}
/// <summary>
/// Adds a body part to an existing MailMessage instance.
/// </summary>
/// <param name="message">Extension method for the MailMessage class.</param>
/// <param name="part">The body part to add to the MailMessage instance.</param>
/// <param name="content">The content of the body part.</param>
private static void AddBodypart(this MailMessage message, Bodypart part, string content) {
Encoding encoding = part.Parameters.ContainsKey("Charset") ?
Util.GetEncoding(part.Parameters["Charset"]) : Encoding.ASCII;
// decode content if it was encoded
byte[] bytes;
try {
switch (part.Encoding) {
case ContentTransferEncoding.QuotedPrintable:
bytes = encoding.GetBytes(Util.QPDecode(content, encoding));
break;
case ContentTransferEncoding.Base64:
bytes = Util.Base64Decode(content);
break;
default:
bytes = Encoding.ASCII.GetBytes(content);
break;
}
} catch {
// If it's not a valid Base64 or quoted-printable encoded string
// just leave the data as is
bytes = Encoding.ASCII.GetBytes(content);
}
// If the MailMessage's Body fields haven't been initialized yet, put it there.
// Some weird (i.e. spam) mails like to omit content-types so don't check for
// that here and just assume it's text.
if (message.Body == string.Empty) {
message.Body = encoding.GetString(bytes);
message.BodyEncoding = encoding;
message.IsBodyHtml = part.Subtype.ToLower() == "html";
return;
}
if (part.Disposition.Type == ContentDispositionType.Attachment)
message.Attachments.Add(CreateAttachment(part, bytes));
else
message.AlternateViews.Add(CreateAlternateView(part, bytes));
}
