// A parenthesized list that describes the [MIME-IMB] body
// structure of a message.
// Multiple parts are indicated by parenthesis nesting. Instead
// of a body type as the first element of the parenthesized list,
// there is a sequence of one or more nested body structures. The
// second element of the parenthesized list is the multipart
// subtype (mixed, digest, parallel, alternative, etc.).
// Example: (line breaks added for clarity)
// ("TEXT" "PLAIN" ("CHARSET" "ISO-8859-1") NIL NIL "7BIT" 2 1 NIL NIL NIL)
// ("TEXT" "HTML" ("CHARSET" "ISO-8859-1") NIL NIL "7BIT" 27 1 NIL NIL NIL)
// "ALTERNATIVE" ("BOUNDARY" "047d7bea2f06ddf77e04ec9b2a60") NIL NIL)
// Or for non-multipart:
// "TEXT" "PLAIN" ("CHARSET" "ISO-8859-1") NIL NIL "7BIT" 13 1 NIL NIL NIL
public static MailMessage ParseBodyStructure(string rawBodyStructure, MailMessage messageData)
{
IList <string> tokens = ParseTokenList(rawBodyStructure);
// Multipart or not?
IList <string> subTokens = ParseTokenList(tokens[0]);
if (subTokens.Count == 1)
{
// Singlepart
messageData.ContentType = GetContentType(tokens);
messageData.ContentTransferEncoding = tokens[5];
messageData.BodyId = "1";
// TODO: Size
// TODO: What are all the other fields?
}
else
{
messageData.Scope = Scope.HeadersAndMime;
Attachment bodyPart;
// Multipart
int tokenIndex = 0;
// Starts with a list of part descriptors:
// "TEXT" "PLAIN" ("CHARSET" "ISO-8859-1") NIL NIL "7BIT" 13 1 NIL NIL NIL
while (subTokens.Count > 1)
{
int subtokenIndex = 0;
// Check for nested MIME, flatten it.
IList <string> subSubTokens = ParseTokenList(subTokens[subtokenIndex]);
if (subSubTokens.Count > 1)
{
do
{
bodyPart = new Attachment();
bodyPart.ContentType = GetContentType(subSubTokens);
bodyPart.ContentTransferEncoding = subSubTokens[5];
bodyPart.BodyId = (tokenIndex + 1).ToString(CultureInfo.InvariantCulture)
+ '.' + (subtokenIndex + 1).ToString(CultureInfo.InvariantCulture);
// TODO: Size
// TODO: What are all the other fields?
messageData.Add(bodyPart);
subtokenIndex++;
subSubTokens = ParseTokenList(subTokens[subtokenIndex]);
}while (subSubTokens.Count > 1);
// Ignore the content-type and boundary for nested mime.
}
else
{
bodyPart = new Attachment();
bodyPart.ContentType = GetContentType(subTokens);
bodyPart.ContentTransferEncoding = subTokens[5];
bodyPart.BodyId = (tokenIndex + 1).ToString(CultureInfo.InvariantCulture);
// TODO: Size
// TODO: What are all the other fields?
messageData.Add(bodyPart);
}
tokenIndex++;
subTokens = ParseTokenList(tokens[tokenIndex]);
}
subTokens = ParseTokenList(tokens[tokenIndex + 1]);
messageData.ContentType = "multipart/" + tokens[tokenIndex] + "; " + subTokens[0] + "=" + subTokens[1];
}
return(messageData);
}