private static async Task ProcessChallengeAsync(ImapEnvelope envelope, ImapMailbox mailbox)
{
var bytes = await mailbox.FetchMessageBodyAsync(envelope.Uid);
var message = new MailMessageReader(bytes);
var token = string.Empty;
var nonce = string.Empty;
var publicKey = string.Empty;
const string pattern = @"\s|\t|\n|\r";
var xHeaders = message.Headers.UnknownHeaders;
for (var i = 0; i < xHeaders.Keys.Count; i++)
{
var key = xHeaders.Keys[i];
var values = xHeaders.GetValues(i);
if (values == null)
{
throw new NullReferenceException(Resources.ChallengeCorruptException);
}
if (string.Compare(key, ParanoiaHeaderKeys.Token, StringComparison.InvariantCultureIgnoreCase) == 0)
{
token = values.FirstOrDefault() ?? string.Empty;
token = Regex.Replace(token, pattern, string.Empty);
continue;
}
if (string.Compare(key, ParanoiaHeaderKeys.Nonce, StringComparison.InvariantCultureIgnoreCase) == 0)
{
nonce = values.FirstOrDefault() ?? string.Empty;
nonce = Regex.Replace(nonce, pattern, string.Empty);
continue;
}
if (string.Compare(key, ParanoiaHeaderKeys.PublicKey, StringComparison.InvariantCultureIgnoreCase) == 0)
{
publicKey = values.FirstOrDefault() ?? string.Empty;
publicKey = Regex.Replace(publicKey, pattern, string.Empty);
}
}
if (string.IsNullOrEmpty(token) || string.IsNullOrEmpty(nonce) || string.IsNullOrEmpty(publicKey))
{
throw new InvalidDataException(Resources.ChallengeCorruptException);
}
var data = App.Context.KeyContainer.DecryptWithPrivateKey(
Convert.FromBase64String(token),
Convert.FromBase64String(publicKey),
Convert.FromBase64String(nonce));
await RespondToChallengeAsync(Encoding.UTF8.GetString(data));
}
public static MailMessageModel ToMailMessage(this ImapEnvelope envelope, MailType type)
{
return(new MailMessageModel {
EntryDate = envelope.InternalDate.HasValue
? envelope.InternalDate.Value
: DateTime.Now,
Subject = envelope.Subject,
Flags = string.Join(";", envelope.Flags),
Size = envelope.Size,
Uid = envelope.Uid,
MessageId = envelope.MessageId,
FromAddress = envelope.From.Any()
? envelope.From.First().Address
: string.Empty,
FromName = envelope.From.Any()
? envelope.From.First().DisplayName
: string.Empty,
Type = type
});
}
