async Task TraverseEmail(StreamWriter filew, int id, int part, Email email)
{
await WriteStatsLine(filew, "part: {0}", part);
int csize = await CompressedSize(email.headers.GetBytes());
await WriteStatsLine(filew, "headers: {0} {1} {2}", email.headers.GetNumberOfHeaders(), email.headers.size, csize);
await WriteStatsLine(filew, "contenttype: {0}", email.headers.contentTypeFullStr);
switch (email.content.dataType)
{
case DataType.Data:
if (email.headers.contentType == ContentType.Audio || email.headers.contentType == ContentType.Video ||
email.headers.contentType == ContentType.Image || email.headers.contentType == ContentType.Application)
{
byte[] buff = email.content.GetBytes();
csize = await CompressedSize(buff);
String sha1 = Sha1(buff);
await WriteStatsLine(filew, "attachment: {0} {1} {2}", sha1, email.content.size, csize);
}
else
{
csize = await CompressedSize(email.content.GetBytes());
await WriteStatsLine(filew, "body: {0} {1}", email.content.size, csize);
}
break;
case DataType.Message:
await WriteStatsLine(filew, "start rfc822: {0}", id);
await TraverseEmail(filew, (id + 1), 0, email.content.data[0]);
await WriteStatsLine(filew, "end rfc822: {0}", id);
break;
case DataType.Multipart:
await WriteStatsLine(filew, "start multipart {0} {1}:", id, email.content.data.Count);
int p = 0;
foreach (Email e in email.content.data)
await TraverseEmail(filew, id + 1, p++, e);
await WriteStatsLine(filew, "end multipart {0}", id);
break;
}
}
public static void TraverseEmail(Email email)
{
String headers = email.headers.GetString();
ContentType ctype = email.headers.contentType;
DataType dtype = email.content.dataType;
int size = email.content.size;
switch (dtype)
{
case DataType.Data:
String content = email.content.GetString();
break;
case DataType.Message:
case DataType.Multipart:
foreach (Email e in email.content.data)
TraverseEmail(e);
break;
default:
break;
}
return;
}
public async Task<ParseResult> Parse(MessageReader reader, ContentType type = ContentType.Text,
ContentSubtype subtype = ContentSubtype.Plain, Boundary boundary = null)
{
if (type == ContentType.Multipart)
{
dataType = DataType.Multipart;
while (true)
{
String line = await reader.ReadLineAsync();
if (line == null)
{
SetSize();
return ParseResult.Eof;
}
else if (EmailParser.IsPostmark(line))
{
// consumed too much, probably missing boundary?
reader.PushCacheLine(line);
SetSize();
return ParseResult.Postmark;
}
WriteWithCrlf(line);
// find open boundary
if (boundary.IsOpen(line))
{
Email email = null;
ParseResult res;
do
{
// consume all parts, consisting of header (optional) and content
// the boundary token delimets the part
// the close boundary completes multipart parsing
// content in the multipart is responsible for consuming it's delimeter (end)
// exception is the last part which is also multipart
email = new Email(entity);
Add(email);
} while ((res = await email.Parse(reader, type, subtype, boundary)) == ParseResult.OkMultipart); // Ok
// if the last part is a multipart or message? itself then it doesn't consume the close boundary
// or more parts, continue parsing until all parts and close boundary are consumed
/*if (Ok(res) && (data.Last<Email>().content.dataType == DataType.Multipart ||
data.Last<Email>().content.dataType == DataType.Message))*/
if (res == ParseResult.Ok && boundary.NotClosed())
continue;
if (res != ParseResult.Failed)
SetSize();
return res;
}
else if (boundary.IsClose(line, reader))
{
SetSize();
return ParseResult.Ok; // OkMultipart
}
}
}
else if (type == ContentType.Message)
{
dataType = DataType.Message;
Email email = new Email(entity);
Add(email);
ParseResult res = await email.Parse(reader, type, subtype, boundary);
if (res != ParseResult.Failed)
SetSize();
return res;
}
else
{
dataType = DataType.Data;
while (true)
{
String line = await reader.ReadLineAsync();
if (line == null)
{
SetSize();
return ParseResult.Eof;
}
else if (EmailParser.IsPostmark(line))
{
// consumed too much, probably closing boundary is missing ?
reader.PushCacheLine(line);
SetSize();
return ParseResult.Postmark;
}
else if (boundary != null && boundary.IsOpen(line))
{
SetSize();
RewindLastCrlfSize();
WriteWithCrlf(line);
return ParseResult.OkMultipart; //Ok
}
else if (boundary != null && boundary.IsClose(line, reader))
{
SetSize();
RewindLastCrlfSize();
WriteWithCrlf(line);
return ParseResult.Ok; //OkMultipart
}
else
WriteWithCrlf(line);
}
}
}
/* Assume (for now) the message starts with the postmark,
Further assume the message structure
postmark\r\n
headers\r\n
\r\n
body
*/
public async Task<ParseResult> Parse(MessageReader reader)
{
postmark = new Postmark(entity);
if ((await postmark.Parse(reader)) == ParseResult.Failed)
throw new ParsingFailedException("postmark is not found");
email = new Email(entity);
ParseResult res = await email.Parse(reader);
if (res != ParseResult.Eof && res != ParseResult.Postmark)
await ConsumeToEnd(reader);
SetSize();
return res;
}
void Add(Email email)
{
if (data == null)
data = new List<Email>();
data.Add(email);
}
