public static ImapCommandResult CreateSession(IImapSessionProfile profile,
SaslClientMechanism authMechanismSpecified,
UpgradeConnectionStreamCallback createSslStreamCallback,
out ImapSession session)
{
if (profile == null)
throw new ArgumentNullException("profile");
var authority = profile.Authority;
var securePort = string.Equals(authority.Scheme, ImapUri.UriSchemeImaps, StringComparison.OrdinalIgnoreCase);
if (securePort && createSslStreamCallback == null)
throw new ArgumentNullException("createSslStreamCallback");
ImapCommandResult result;
session = null;
session = new ImapSession(authority.Host,
authority.Port,
true,
profile.Timeout,
securePort
? createSslStreamCallback
: null);
session.HandlesIncapableAsException = false;
session.HandlesReferralAsException = false;
session.TransactionTimeout = profile.Timeout;
session.SendTimeout = profile.SendTimeout;
session.ReceiveTimeout = profile.ReceiveTimeout;
if (session.ServerCapabilities.Count == 0)
// try querying server capability (ignore error)
session.Capability();
if (!session.ServerCapabilities.Has(ImapCapability.Imap4Rev1))
throw new ImapIncapableException(ImapCapability.Imap4Rev1);
if (profile.UseTlsIfAvailable && session.ServerCapabilities.Has(ImapCapability.StartTls) && !session.IsSecureConnection) {
var r = session.StartTls(createSslStreamCallback, true);
if (r.Failed)
throw new ImapSecureConnectionException(r.ResultText);
else if (!session.ServerCapabilities.Has(ImapCapability.Imap4Rev1))
throw new ImapIncapableException(ImapCapability.Imap4Rev1);
}
if (profile.UseDeflateIfAvailable && session.ServerCapabilities.Has(ImapCapability.CompressDeflate)) {
var r = session.Compress(ImapCompressionMechanism.Deflate);
if (r.Failed)
throw new WebException(r.ResultText, null, WebExceptionStatus.RequestCanceled, null);
}
if (authMechanismSpecified == null)
result = Authenticate(session, profile);
else
result = session.Authenticate(authMechanismSpecified);
if (result == null) {
throw new ImapAuthenticationException("appropriate authentication mechanism not found");
}
else if (result.Failed) {
try {
try {
session.Disconnect(false);
}
catch (ImapConnectionException) {
// ignore
}
}
finally {
session = null;
}
}
return result;
}