/// <summary>
/// Sends a command to the POP server.
/// </summary>
/// <param name="cmd">command to send to server</param>
/// <returns>true if server responded "+OK"</returns>
private PopCommandResponse SendCommand(string cmd)
{
PopCommandResponse response = PopCommandResponse.NullResponse;
try
{
if (StreamWriter.BaseStream.CanWrite)
{
StreamWriter.WriteLine(cmd);
StreamWriter.Flush();
response = PopCommandResponse.FromRawResponseString(StreamReader.ReadLine());
}
}
catch (Exception e)
{
if (e is IOException)
{
throw e;
}
else
{
string err = cmd + ":" + e.Message;
Debug.WriteLine(e);
throw new PopServerResponseErrException(err, e);
}
}
return(response);
}
/// <summary>
/// Get the sizes of all the messages.
/// </summary>
/// <returns>Size of each message</returns>
public IEnumerable <PopStat> List()
{
if (!Connected)
{
throw new InvalidOperationException("You must be connected.");
}
List <PopStat> sizes = null;
PopCommandResponse response = SendCommand("LIST");
if (response.Success)
{
sizes = new List <PopStat>();
string line;
while (null != (line = StreamReader.ReadLine()) && "." != line)
{
string[] s = line.Split(' ');
if (s.Length > 1)
{
PopStat stat = new PopStat();
int.TryParse(s[0], out stat.MessageNumber);
int.TryParse(s[1], out stat.Size);
sizes.Add(stat);
}
}
}
return(new ReadOnlyCollection <PopStat>(sizes));
}
/// <summary>
/// Get a list of message numbers with a unique identifier for each message number.
/// </summary>
public IEnumerable <PopUid> GetMessageUids()
{
if (!Connected)
{
throw new InvalidOperationException("You must be connected.");
}
List <PopUid> uids = new List <PopUid>();
PopCommandResponse response = SendCommand("UIDL");
if (response.Success)
{
string line;
while (null != (line = StreamReader.ReadLine()) && "." != line)
{
string[] s = line.Split(' ');
if (s.Length > 1)
{
PopUid uid = new PopUid();
int.TryParse(s[0], out uid.MessageNumber);
uid.UniqueIdentifier = s[1];
uids.Add(uid);
}
}
}
return(new ReadOnlyCollection <PopUid>(uids));
}
/// <summary>
/// Get max message number and mailbox size.
/// </summary>
/// <returns>PopStat object with the max message number and mailbox size.</returns>
public PopStat SendStat()
{
PopCommandResponse response = SendCommand("STAT");
PopStat stat = new PopStat();
IList <int> v = response.IntValues();
if (v.Count > 1)
{
stat.MessageNumber = v[0];
stat.Size = v[1];
}
return(stat);
}
/// <summary>
/// Get the size of a message
/// </summary>
/// <param name="intMessageNumber">message number</param>
/// <returns>Size of message</returns>
public PopStat List(int intMessageNumber)
{
if (!Connected)
{
throw new InvalidOperationException("You must be connected.");
}
PopCommandResponse response = SendCommand("LIST " + intMessageNumber.ToString());
PopStat stat = new PopStat();
IList <int> v = response.IntValues();
stat.MessageNumber = v[0];
stat.Size = v[1];
return(stat);
}
/// <summary>
/// Authenticate the user with APOP
/// </summary>
/// <param name="username">user name</param>
/// <param name="password">password</param>
private void SendApop(string username, string password)
{
PopCommandResponse response = SendCommand("APOP " + username + " " + ComputeHashAsHexString(password));
if (!response.Success)
{
if (Regex.IsMatch(response.RawValue, "lock", RegexOptions.IgnoreCase))
{
throw new MailboxLockedException("Mailbox locked by another client. Try again later.", response.ToException());
}
else
{
throw new PopAuthenticationException("APOP Authentication: " + response.RawValue, response.ToException());
}
}
}
/// <summary>
/// Get unique identifier for the given message number.
/// </summary>
/// <param name="intMessageNumber">message number</param>
public PopUid GetMessageUid(int intMessageNumber)
{
if (!Connected)
{
throw new InvalidOperationException("You must be connected.");
}
PopCommandResponse response = SendCommand("UIDL " + intMessageNumber.ToString());
if (response.Success)
{
if (response.Parameters.Count > 1)
{
PopUid uid = new PopUid();
int.TryParse(response.Parameters[0], out uid.MessageNumber);
uid.UniqueIdentifier = response.Parameters[1];
}
}
throw new InvalidDataException("Server responded with invalid data: " + response.RawValue);
}
/// <summary>
/// Get the capabilities of the server.
/// </summary>
/// <returns></returns>
public IEnumerable <string> Capabilities()
{
if (!Connected)
{
throw new InvalidOperationException("You must be connected.");
}
List <string> caps = new List <string>();
PopCommandResponse response = SendCommand("CAPA");
if (response.Success)
{
string line;
while (null != (line = StreamReader.ReadLine()) && "." != line)
{
caps.Add(line);
}
}
return(new ReadOnlyCollection <string>(caps));
}
/// <summary>
/// fetches a message or a message header
/// </summary>
/// <param name="messageNumber">message number on the server</param>
/// <param name="fetchHeaderOnly">Only return message header?</param>
/// <returns>Stream of mime-encoded text data. Returns null of the command failed.</returns>
private TextReader GetMessageReader(int messageNumber, bool fetchHeaderOnly)
{
string cmd;
if (fetchHeaderOnly)
{
cmd = string.Format("TOP {0} 0", messageNumber.ToString());
}
else
{
cmd = string.Format("RETR {0}", messageNumber.ToString());
}
PopCommandResponse response = SendCommand(cmd);
if (!response.Success)
{
response.Throw();
}
return(StreamReader);
}
/// <summary>
/// Authenticate the user with USER/PASS
/// </summary>
/// <param name="username">user name</param>
/// <param name="password">password</param>
private void SendUserPass(string username, string password)
{
PopCommandResponse response = SendCommand("USER " + username);
if (!response.Success)
{
throw new PopAuthenticationException("USER/PASS Authentication: " + response.RawValue, response.ToException());
}
response = SendCommand("PASS " + password);
if (!response.Success)
{
if (Regex.IsMatch(response.RawValue, "lock", RegexOptions.IgnoreCase))
{
throw new MailboxLockedException("Mailbox locked by another client. Try again later.", response.ToException());
}
else
{
throw new PopAuthenticationException("USER/PASS Authentication: " + response.RawValue, response.ToException());
}
}
}
static PopCommandResponse()
{
NullResponse = new PopCommandResponse( null );
}
static PopCommandResponse()
{
NullResponse = new PopCommandResponse(null);
}
/// <summary>
/// Connect to the server. Requires that the Port and Host properties be set.
/// </summary>
public void Connect()
{
if (Connected)
{
throw new InvalidOperationException("PopClient is already connected.");
}
if (Host == null || Host == default(string))
{
throw new InvalidOperationException("The Host property must be set.");
}
string host = Host;
int port = Port;
SslProtocols sslProtocol = SslProtocol;
ClientSocket.Connect(host, port);
Stream stream = ClientSocket.GetStream();
if (SslProtocols.None != sslProtocol)
{
if (SslNegotiationMode.Connect == SslNegotiationMode)
{
//Implements POP3S capability for SSL/TLS connections on an alternate port.
//For POPS/Connect, we negotiate an SslStream immediately.
stream = NegotiateSslStream(host, sslProtocol, stream);
}
else
{
//UNDONE: test STARTTLS. (Need an account on a compatible server.)
//For STLS, we have to start out with plain text and then issue the STLS command and if the server says +OK
//we can negotiate TLS. Have to do this without using a StreamReader or StreamWriter because we need to change
//the stream from a NetworkStream to an SslStream. The stream inside of a StreamReader and StreamWriter can't
//be changed and closing the StreamReader or StreamWriter will close the stream upon which the SslStream is based.
string response;
try
{
//don't close or dispose these StreamReader and StreamWriter objects of the stream will be closed.
StreamWriter writer = new StreamWriter(stream);
StreamReader reader = new StreamReader(stream);
writer.WriteLine("STLS");
response = reader.ReadLine();
}
catch (Exception ex)
{
if (null != stream)
{
try{ stream.Dispose(); } catch (ObjectDisposedException) {}
}
this.Disconnect();
throw new StartTlsNegotiationException("STARTTLS negotiation failed. Consider using SslNegotiationMode.Connect.", ex);
}
if (PopCommandResponse.IsResponseSuccess(response))
{
stream = NegotiateSslStream(host, sslProtocol, stream);
}
else
{
if (null != stream)
{
try{ stream.Dispose(); } catch (ObjectDisposedException) {}
}
this.Disconnect();
throw new StartTlsNegotiationException(response);
}
}
}
StreamReader = new StreamReader(stream, Encoding.Default, true);
StreamWriter = new StreamWriter(stream);
StreamWriter.AutoFlush = true;
PopCommandResponse popresponse = PopCommandResponse.FromRawResponseString(StreamReader.ReadLine());
if (popresponse.Success)
{
Match match = Regex.Match(popresponse.RawValue, @"^\+OK\s.+(<.+>$)");
if (match.Success)
{
ApopTimestamp = match.Groups[1].Value;
}
}
else
{
this.Disconnect();
popresponse.ToException();
}
}