/// <summary>
/// Takes posession of the <see cref="Pop3Stream"/> and reads the greeting.
/// </summary>
/// <remarks>
/// Takes posession of the <see cref="Pop3Stream"/> and reads the greeting.
/// </remarks>
/// <param name="pop3">The pop3 stream.</param>
/// <param name="cancellationToken">The cancellation token</param>
public void Connect(Pop3Stream pop3, CancellationToken cancellationToken)
{
if (stream != null)
{
stream.Dispose();
}
Capabilities = Pop3Capabilities.User;
AuthenticationMechanisms.Clear();
State = Pop3EngineState.Disconnected;
ApopToken = null;
stream = pop3;
// read the pop3 server greeting
var greeting = ReadLine(cancellationToken).TrimEnd();
int index = greeting.IndexOf(' ');
string token, text;
if (index != -1)
{
token = greeting.Substring(0, index);
while (index < greeting.Length && char.IsWhiteSpace(greeting[index]))
{
index++;
}
if (index < greeting.Length)
{
text = greeting.Substring(index);
}
else
{
text = string.Empty;
}
}
else
{
text = string.Empty;
token = greeting;
}
if (token != "+OK")
{
stream.Dispose();
stream = null;
throw new Pop3ProtocolException(string.Format("Unexpected greeting from server: {0}", greeting));
}
index = text.IndexOf('>');
if (text.Length > 0 && text[0] == '<' && index != -1)
{
ApopToken = text.Substring(0, index + 1);
Capabilities |= Pop3Capabilities.Apop;
}
State = Pop3EngineState.Connected;
}
async Task <Pop3CommandStatus> QueryCapabilitiesAsync(bool doAsync, CancellationToken cancellationToken)
{
if (stream == null)
{
throw new InvalidOperationException();
}
// clear all CAPA response capabilities (except the APOP and USER capabilities)
Capabilities &= Pop3Capabilities.Apop | Pop3Capabilities.User;
AuthenticationMechanisms.Clear();
Implementation = null;
ExpirePolicy = 0;
LoginDelay = 0;
var pc = QueueCommand(cancellationToken, CapaHandler, "CAPA");
while (await IterateAsync(doAsync).ConfigureAwait(false) < pc.Id)
{
// continue processing commands...
}
return(pc.Status);
}
public Pop3CommandStatus QueryCapabilities(CancellationToken cancellationToken)
{
if (stream == null)
{
throw new InvalidOperationException();
}
// clear all CAPA response capabilities (except the APOP capability)
Capabilities &= Pop3Capabilities.Apop;
AuthenticationMechanisms.Clear();
Implementation = null;
ExpirePolicy = 0;
LoginDelay = 0;
var pc = QueueCommand(cancellationToken, CapaHandler, "CAPA");
while (Iterate() < pc.Id)
{
// continue processing commands...
}
return(pc.Status);
}
async Task ConnectAsync(Pop3Stream pop3, bool doAsync, CancellationToken cancellationToken)
{
if (stream != null)
{
stream.Dispose();
}
Capabilities = Pop3Capabilities.User;
AuthenticationMechanisms.Clear();
State = Pop3EngineState.Disconnected;
ApopToken = null;
stream = pop3;
// read the pop3 server greeting
var greeting = (await ReadLineAsync(doAsync, cancellationToken).ConfigureAwait(false)).TrimEnd();
int index = greeting.IndexOf(' ');
string token, text;
if (index != -1)
{
token = greeting.Substring(0, index);
while (index < greeting.Length && char.IsWhiteSpace(greeting[index]))
{
index++;
}
if (index < greeting.Length)
{
text = greeting.Substring(index);
}
else
{
text = string.Empty;
}
}
else
{
text = string.Empty;
token = greeting;
}
if (token != "+OK")
{
stream.Dispose();
stream = null;
throw new Pop3ProtocolException(string.Format("Unexpected greeting from server: {0}", greeting));
}
index = text.IndexOf('<');
if (index != -1 && index + 1 < text.Length)
{
int endIndex = text.IndexOf('>', index + 1);
if (endIndex++ != -1)
{
ApopToken = text.Substring(index, endIndex - index);
Capabilities |= Pop3Capabilities.Apop;
}
}
State = Pop3EngineState.Connected;
}
