使用Twisted Python SMTP對數據的自定義響應？

Question

如何使用Twisted的SMTP指定自定義錯誤代碼/對DATA命令的響應？ 在代碼中的eomReceived中，我想使用自定義字符串返回失敗。 現在，我可以返回帶有errback設置的Deferred（），它發送回550代碼，但是我無法指定響應字符串，並且在日志中收到未處理的錯誤。

class ConsoleMessageDelivery:
    implements(smtp.IMessageDelivery)

    def receivedHeader(self, helo, origin, recipients):
        myHostname, clientIP = helo
        headerValue = "by %s from %s with ESMTP ; %s" % (myHostname, clientIP, smtp.rfc822date())
        # email.Header.Header used for automatic wrapping of long lines
        return "Received: %s" % Header(headerValue)

    def validateFrom(self, helo, origin):
        # All addresses are accepted
        return origin

    def validateTo(self, user):
        if user.dest.local == "console":
            return lambda: ConsoleMessage()
        raise smtp.SMTPBadRcpt(user)

class ConsoleMessage:
    implements(smtp.IMessage)

    def __init__(self):
        self.lines = []

    def lineReceived(self, line):
        self.lines.append(line)

    def eomReceived(self):
        # do something here, return defer.succeed(None) on success
        # right now on error, I do the following:
        d = defer.Deferred()
        d.errback("An error occurred")
        return d

    def connectionLost(self):
        # There was an error, throw away the stored lines
        self.lines = None

class ConsoleSMTPFactory(smtp.SMTPFactory):
    protocol = smtp.ESMTP

    def __init__(self, *a, **kw):
        smtp.SMTPFactory.__init__(self, *a, **kw)
        self.delivery = ConsoleMessageDelivery()

    def buildProtocol(self, addr):
        p = smtp.SMTPFactory.buildProtocol(self, addr)
        p.delivery = self.delivery
        return p

Answer 1

你需要：

• ESTMP子類
• 在您的子類上實現do_DATA（有關示例，請參見twisted.mail.smtp.SMTP）

SMTP基類的lineReceived會收到您的行，並將其傳遞給state_COMMAND（假定它處於命令狀態），該行將查找以do_開頭的方法以將其余的行傳遞給該方法。