python - 将 SMTP AUTH 支持添加到 Python smtpd 库...无法覆盖该方法？

Question

所以，我想扩展 Python smtpd SMTPServer 类，以便它可以处理 SMTP AUTH 连接。看起来很简单......

所以，看起来我可以这样开始:

def smtp_EHLO(self, arg):
    print 'got in arg: ', arg
    # do stuff here...

但由于某种原因，它永远不会被调用。 Python smtpd 库像这样调用其他类似的方法:

        method = None
        i = line.find(' ')
        if i < 0:
            command = line.upper()
            arg = None
        else:
            command = line[:i].upper()
            arg = line[i+1:].strip()
        method = getattr(self, 'smtp_' + command, None)

为什么它不调用我的方法？

在那之后，我认为我可以覆盖整个 found_terminator(self): 方法，但这似乎也不起作用。

 def found_terminator(self):
     # I add this to my child class and it never gets called... 

我是在做傻事还是……？也许我今天还没有完全醒来......

import smtpd
import asyncore

class CustomSMTPServer(smtpd.SMTPServer):

    def smtp_EHLO(self, arg):

        print 'got in arg: ', arg

    def process_message(self, peer, mailfrom, rcpttos, data):
        print 'Receiving message from:', peer
        print 'Message addressed from:', mailfrom
        print 'Message addressed to  :', rcpttos
        print 'Message length        :', len(data)
        print 'HERE WE ARE MAN!'
        return

    # Implementation of base class abstract method
    def found_terminator(self):
        print 'THIS GOT CALLED RIGHT HERE!'

        line = EMPTYSTRING.join(self.__line)
        print >> DEBUGSTREAM, 'Data:', repr(line)
        self.__line = []
        if self.__state == self.COMMAND:
            if not line:
                self.push('500 Error: bad syntax')
                return
            method = None
            i = line.find(' ')
            if i < 0:
                command = line.upper()
                arg = None
            else:
                command = line[:i].upper()
                arg = line[i+1:].strip()
            method = getattr(self, 'smtp_' + command, None)

            print 'looking for: ', command
            print 'method is: ', method

            if not method:
                self.push('502 Error: command "%s" not implemented' % command)
                return
            method(arg)
            return
        else:
            if self.__state != self.DATA:
                self.push('451 Internal confusion')
                return
            # Remove extraneous carriage returns and de-transparency according
            # to RFC 821, Section 4.5.2.
            data = []
            for text in line.split('\r\n'):
                if text and text[0] == '.':
                    data.append(text[1:])
                else:
                    data.append(text)
            self.__data = NEWLINE.join(data)
            status = self.__server.process_message(self.__peer,
                                                   self.__mailfrom,
                                                   self.__rcpttos,
                                                   self.__data)
            self.__rcpttos = []
            self.__mailfrom = None
            self.__state = self.COMMAND
            self.set_terminator('\r\n')
            if not status:
                self.push('250 Ok')
            else:
                self.push(status)

server = CustomSMTPServer(('127.0.0.1', 1025), None)

asyncore.loop()

Answer 1

您需要扩展 SMTPChannel -- 这是 smtp_verb 方法实现的地方； SMTPServer 的扩展只需要返回您自己的 channel 子类。