/// <summary>
/// Authenticates a socket client using plain authentication.
/// </summary>
/// <returns>True if the client was successfully authenticated. False otherwise.</returns>
private async Task <bool> AuthenticateByPlainAsync()
{
if (!IsConnected)
{
return(false);
}
SmtpResponse response = await Socket.Send("Auth Plain");
if (!response.ContainsStatus(SmtpCode.WaitingForAuthentication))
{
return(false);
}
string lineAuthentication = string.Format("{0}\0{0}\0{1}", Username, Password);
SmtpResponse responseAuth = await Socket.Send(Convert.ToBase64String(Encoding.UTF8.GetBytes(lineAuthentication)));
if (!responseAuth.ContainsStatus(SmtpCode.AuthenticationSuccessful))
{
return(false);
}
return(true);
}
/// <summary>
/// Connects to the server.
/// </summary>
/// <returns>True for successful connection. False otherwise.</returns>
private async Task <bool> ConnectAsync()
{
try
{
if (IsConnected)
{
Socket.Dispose();
IsConnected = false;
}
Socket = new SmtpSocket(Server, Port, SSL);
SmtpResponse response = await Socket.EstablishConnection();
if (response.ContainsStatus(SmtpCode.ServiceReady))
{
IsConnected = true;
return(true);
}
}
catch
{
return(false);
}
return(false);
}
/// <summary>
/// Authenticates a socket client using login authentication.
/// </summary>
/// <returns>True if the client was successfully authenticated. False otherwise.</returns>
private async Task <bool> AuthenticateByLoginAsync()
{
if (!IsConnected)
{
return(false);
}
SmtpResponse response = await Socket.Send("Auth Login");
if (!response.ContainsStatus(SmtpCode.WaitingForAuthentication))
{
return(false);
}
SmtpResponse responseUsername = await Socket.Send(Convert.ToBase64String(Encoding.UTF8.GetBytes(Username)));
if (!responseUsername.ContainsStatus(SmtpCode.WaitingForAuthentication))
{
return(false);
}
SmtpResponse responsePassword = await Socket.Send(Convert.ToBase64String(Encoding.UTF8.GetBytes(Password)));
if (!responsePassword.ContainsStatus(SmtpCode.AuthenticationSuccessful))
{
return(false);
}
return(true);
}
/// <summary>
/// Connects to the server.
/// </summary>
/// <returns>True for successful connection. False otherwise.</returns>
public async Task <bool> Connect()
{
try
{
if (IsConnected)
{
Socket.Close();
IsConnected = false;
}
Socket = new SmtpSocket(Server, Port, SSL, Username, Password);
SmtpResponse response = await Socket.EstablishConnection();
if (response.Contains(SmtpCode.ServiceReady))
{
IsConnected = true;
return(true);
}
}
catch
{
return(false);
}
return(false);
}
/// <summary>
/// Sends the specified email message.
/// </summary>
/// <param name="message">The email message.</param>
/// <returns>True if the email was sent successfully. False otherwise.</returns>
public async Task <bool> SendMail(SmtpMessage message)
{
if (!IsConnected)
{
await Connect();
}
if (!IsConnected)
{
throw new Exception("Can't connect to the SMTP server.");
}
if (!IsAuthenticated)
{
await Authenticate();
}
SmtpResponse response = await Socket.Send(string.Format("Mail From:<{0}>", message.From.EmailAddress));
if (!response.Contains(SmtpCode.RequestedMailActionCompleted))
{
return(false);
}
foreach (MailBox to in message.To)
{
SmtpResponse responseTo = await Socket.Send(String.Format("Rcpt To:<{0}>", to.EmailAddress));
if (!responseTo.Contains(SmtpCode.RequestedMailActionCompleted))
{
break;
}
}
SmtpResponse responseData = await Socket.Send(String.Format("Data"));
if (!responseData.Contains(SmtpCode.StartMailInput))
{
return(false);
}
SmtpResponse repsonseMessage = await Socket.Send(await message.CreateMessageBody());
if (!repsonseMessage.Contains(SmtpCode.RequestedMailActionCompleted))
{
return(false);
}
SmtpResponse responseQuit = await Socket.Send("Quit");
if (!responseQuit.Contains(SmtpCode.ServiceClosingTransmissionChannel))
{
return(false);
}
return(true);
}
/// <summary>
/// Authenticates a socket client using the specified Username and Password.
/// </summary>
/// <returns>True if the client was successfully authenticated. False otherwise.</returns>
private async Task <bool> AuthenticateAsync()
{
if (!IsConnected)
{
return(false);
}
// get the type of auth
SmtpResponse response = await Socket.Send("EHLO " + Server);
if (response.ContainsMessage("STARTTLS"))
{
SmtpResponse responseSSL = await Socket.Send("STARTTLS");
if (responseSSL.ContainsStatus(SmtpCode.ServiceReady))
{
await Socket.UpgradeToSslAsync();
return(await AuthenticateAsync());
}
}
if (response.ContainsMessage("AUTH"))
{
if (response.ContainsMessage("LOGIN"))
{
IsAuthenticated = await AuthenticateByLoginAsync();
}
else if (response.ContainsMessage("PLAIN"))
{
IsAuthenticated = await AuthenticateByPlainAsync();
}
}
else
{
await Socket.Send("EHLO " + Server);
IsAuthenticated = true;
}
return(IsAuthenticated);
}
/// <summary>
/// Authenticates a socket client using the specified Username and Password.
/// </summary>
/// <returns>True if the client was successfully authenticated. False otherwise.</returns>
public async Task <bool> Authenticate()
{
if (!IsConnected)
{
throw new Exception("Client is not connected");
}
// get the type of auth
SmtpResponse response = await Socket.Send("EHLO " + Server);
if (response.Contains("STARTTLS"))
{
SmtpResponse responseSSL = await Socket.Send("STARTTLS");
if (responseSSL.Contains(SmtpCode.ServiceReady))
{
await Socket.UpgradeToSslAsync();
return(await Authenticate());
}
}
if (response.Contains("AUTH"))
{
if (response.Contains("LOGIN"))
{
IsAuthenticated = await AuthenticateByLogin();
}
else if (response.Contains("PLAIN"))
{
IsAuthenticated = await AuthenticateByPlain();
}
}
else
{
await Socket.Send("EHLO " + Server);
IsAuthenticated = true;
}
return(IsAuthenticated);
}
private async Task <SmtpResponse> GetResponse(string from)
{
SmtpResponse response = new SmtpResponse();
bool isStartingLine = true;
StringBuilder stringBuilder = null;
int charLen = 3;
Boolean endOfStream = false;
SmtpCode code = SmtpCode.None;
string codeStr = string.Empty;
try
{
stringBuilder = new StringBuilder();
while (!endOfStream)
{
// There is a Strange beahvior when the bufferLength is exactly the same size as the inputStream
await _reader.LoadAsync(BUFFER_LENGTH);
charLen = Math.Min((int)_reader.UnconsumedBufferLength, BUFFER_LENGTH);
if (charLen == 0)
{
endOfStream = true;
break;
}
// If charLen < bufferLength, it's end of stream
if (charLen < BUFFER_LENGTH)
{
endOfStream = true;
}
// get the current position
int charPos = 0;
// Read the buffer
byte[] buffer = new byte[charLen];
_reader.ReadBytes(buffer);
do
{
// get the character
char chr = (char)buffer[charPos];
// if it's starting point, we can read the first 3 chars.
if (isStartingLine)
{
codeStr += chr;
// Get the code
if (codeStr.Length == 3)
{
int codeInt;
if (int.TryParse(codeStr, out codeInt))
{
code = (SmtpCode)codeInt;
}
// next
isStartingLine = false;
}
}
else if (chr == '\r' || chr == '\n')
{
// Advance 1 byte to get the '\n' if not at the end of the buffer
if (chr == '\r' && charPos < (charLen - 1))
{
charPos++;
chr = (char)buffer[charPos];
}
if (chr == '\n')
{
KeyValuePair <SmtpCode, String> r = new KeyValuePair <SmtpCode, string>
(code, stringBuilder.ToString());
response.Values.Add(r);
Debug.WriteLine("{0}{1}", ((int)code).ToString(), stringBuilder.ToString());
stringBuilder = new StringBuilder();
code = SmtpCode.None;
codeStr = string.Empty;
isStartingLine = true;
}
}
else
{
stringBuilder.Append(chr);
}
charPos++;
} while (charPos < charLen);
}
}
catch
{
throw;
}
return(response);
}
private async Task<SmtpResponse> GetResponse(string from)
{
SmtpResponse response = new SmtpResponse();
bool isStartingLine = true;
StringBuilder stringBuilder = null;
int charLen = 3;
Boolean endOfStream = false;
SmtpCode code = SmtpCode.None;
string codeStr = string.Empty;
try
{
stringBuilder = new StringBuilder();
while (!endOfStream)
{
// There is a Strange beahvior when the bufferLength is exactly the same size as the inputStream
await _reader.LoadAsync(BUFFER_LENGTH);
charLen = Math.Min((int)_reader.UnconsumedBufferLength, BUFFER_LENGTH);
if (charLen == 0)
{
endOfStream = true;
break;
}
// If charLen < bufferLength, it's end of stream
if (charLen < BUFFER_LENGTH)
endOfStream = true;
// get the current position
int charPos = 0;
// Read the buffer
byte[] buffer = new byte[charLen];
_reader.ReadBytes(buffer);
do
{
// get the character
char chr = (char)buffer[charPos];
// if it's starting point, we can read the first 3 chars.
if (isStartingLine)
{
codeStr += chr;
// Get the code
if (codeStr.Length == 3)
{
int codeInt;
if (int.TryParse(codeStr, out codeInt))
code = (SmtpCode)codeInt;
// next
isStartingLine = false;
}
}
else if (chr == '\r' || chr == '\n')
{
// Advance 1 byte to get the '\n' if not at the end of the buffer
if (chr == '\r' && charPos < (charLen - 1))
{
charPos++;
chr = (char)buffer[charPos];
}
if (chr == '\n')
{
KeyValuePair<SmtpCode, String> r = new KeyValuePair<SmtpCode, string>
(code, stringBuilder.ToString());
response.Values.Add(r);
Debug.WriteLine("{0}{1}", ((int)code).ToString(), stringBuilder.ToString());
stringBuilder = new StringBuilder();
code = SmtpCode.None;
codeStr = string.Empty;
isStartingLine = true;
}
}
else
{
stringBuilder.Append(chr);
}
charPos++;
} while (charPos < charLen);
}
}
catch
{
throw;
}
return response;
}
/// <summary>
/// Sends the specified email message.
/// </summary>
/// <param name="message">The email message.</param>
/// <returns>True if the email was sent successfully. False otherwise.</returns>
public async Task <SmtpResult> SendMailAsync(EmailMessage message)
{
if (!IsConnected)
{
await ConnectAsync();
}
if (!IsConnected)
{
return(SmtpResult.ConnectionFailed);
}
if (!IsAuthenticated)
{
await AuthenticateAsync();
}
if (!IsAuthenticated)
{
return(SmtpResult.AuthenticationFailed);
}
SmtpResponse response = message.Sender != null && message.Sender.Address.Length != 0 ?
await Socket.Send(string.Format("Mail From:<{0}>", message.Sender.Address)) :
await Socket.Send(string.Format("Mail From:<{0}>", Username));
if (!response.ContainsStatus(SmtpCode.RequestedMailActionCompleted))
{
return(SmtpResult.CouldNotCreateMail);
}
foreach (EmailRecipient to in message.To)
{
SmtpResponse responseTo = await Socket.Send(string.Format("Rcpt To:<{0}>", to.Address));
if (!responseTo.ContainsStatus(SmtpCode.RequestedMailActionCompleted))
{
break;
}
}
foreach (EmailRecipient to in message.CC)
{
SmtpResponse responseTo = await Socket.Send(string.Format("Rcpt To:<{0}>", to.Address));
if (!responseTo.ContainsStatus(SmtpCode.RequestedMailActionCompleted))
{
break;
}
}
foreach (EmailRecipient to in message.Bcc)
{
SmtpResponse responseTo = await Socket.Send(string.Format("Rcpt To:<{0}>", to.Address));
if (!responseTo.ContainsStatus(SmtpCode.RequestedMailActionCompleted))
{
break;
}
}
SmtpResponse responseData = await Socket.Send(string.Format("Data"));
if (!responseData.ContainsStatus(SmtpCode.StartMailInput))
{
return(SmtpResult.CouldNotCreateMail);
}
SmtpResponse repsonseMessage = await Socket.Send(await BuildSmtpMailInput(message));
if (!repsonseMessage.ContainsStatus(SmtpCode.RequestedMailActionCompleted))
{
return(SmtpResult.CouldNotCreateMail);
}
SmtpResponse responseQuit = await Socket.Send("Quit");
if (!responseQuit.ContainsStatus(SmtpCode.ServiceClosingTransmissionChannel))
{
return(SmtpResult.CouldNotCloseTransmissionChannel);
}
return(SmtpResult.OK);
}
