public static ImapEnvelope Parse(string text)
{
// Escape nested quotes.
// TODO: Should be included in the regex.
text = text.Replace("\\\"", "%%%");
var envelope = new ImapEnvelope();
var matches = FetchMetaRegex.Matches(text);
foreach (Match match in matches)
{
if (match.Value.StartsWith("RFC822.SIZE", StringComparison.InvariantCultureIgnoreCase))
{
envelope.Size = long.Parse(match.Value.Split(' ').Last());
continue;
}
if (match.Value.StartsWith("UID", StringComparison.InvariantCultureIgnoreCase))
{
envelope.Uid = long.Parse(match.Value.Split(' ').Last());
continue;
}
if (match.Value.StartsWith("INTERNALDATE", StringComparison.InvariantCultureIgnoreCase))
{
var date = DateRegex.Match(match.Value).Value;
envelope.InternalDate = DateTime.Parse(date);
continue;
}
if (match.Value.StartsWith("FLAGS", StringComparison.InvariantCultureIgnoreCase))
{
const string pattern = @"\\[A-za-z0-9\*]+";
var flags = Regex.Matches(match.Value, pattern, RegexOptions.CultureInvariant)
.Cast <Match>()
.Select(x => x.Value);
envelope.AddFlags(flags);
}
}
String[] t = { "ENVELOPE" };
var temp = text.Split(t, StringSplitOptions.None);
matches = EnvelopeRegex.Matches(temp[1]);
envelope.Subject = TransferEncoder.Decode(matches[1].Value)
.TrimQuotes()
.Replace("%%%", "\"");
envelope.AddContactsToFrom(ParseContacts(matches[2].Value));
envelope.AddContactsToSender(ParseContacts(matches[3].Value));
envelope.ReplyTo = ParseContacts(matches[4].Value).FirstOrDefault();
envelope.AddContactsToRecipients(ParseContacts(matches[5].Value));
envelope.AddContactsToCc(ParseContacts(matches[6].Value));
envelope.AddContactsToBcc(ParseContacts(matches[7].Value));
envelope.InReplyTo = matches[8].Value.TrimQuotes().TrimNil();
envelope.MessageId = matches[9].Value.TrimQuotes().TrimNil();
return(envelope);
}
private static IEnumerable <MailAddress> ParseContacts(string value)
{
var trimmed = value.TrimAny(1).TrimQuotes();
var entries = Regex.Matches(trimmed, "\\\"\\\"|\\\".+?\\\"|NIL");
var contacts = entries
.OfType <Match>()
.Select(x => x.Value.Trim(new[] { '"', '\\' }))
.Bundle(4).ToArray()
.ToArray();
return(from contact in contacts
select contact.ToArray()
into items
let name = TransferEncoder.Decode(items[0])
let address = string.Format("{0}@{1}", items[2], items[3])
where !string.IsNullOrEmpty(items[3])
select new MailAddress(address, name));
}