AUTH LOGIN support

[mdehus]

AUTH LOGIN support

[Mortal]

Be sure to have a look at PR #66 to see the ongoing effort on implementing AUTH.

To solve the issue of reading additional information on a new line, use yield from self._reader.readline() in your smtp_AUTH() method. You might do something like:

class AuthSMTP(aiosmtpd.smtp.SMTP):
    @asyncio.coroutine
    def smtp_AUTH(self, arg):
        if arg != 'PLAIN':
            yield from self.push('501 Syntax: AUTH PLAIN')
            return
        yield from self.push('334')
        try:
            second_line = yield from self._reader.readline()
        except (ConnectionResetError, asyncio.CancelledError) as error:
            # How to recover here?
            TODO
        try:
            second_line = second_line.rstrip(b'\r\n').decode('ascii')
        except UnicodeDecodeError:
            yield from self.push('500 Error: Challenge must be ASCII')
            return
        if second_line == 'dGVzdAB0ZXN0ADEyMzQ=':
            self.authenticated = True
            yield from self.push('235 Authentication successful')
        else:
            yield from self.push('535 Invalid credentials')

Of course, a bigger issue with implementing AUTH is changing the SMTP class to require authentication before issuing any other command, but that doesn't appear to be what you're asking about.

[pepoluan]

This has been fully implemented in PR #192 , waiting to be Code Reviewed & Merged.