import os

 import asyncio

 import logging

 import base64

 from email import message_from_bytes

 from email.message import Message

 from datetime import datetime

 import aiosmtpd

 from aiosmtpd.controller import Controller

 from aiosmtpd.smtp import SMTP as Server, syntax

 from jinja2 import Template

 mail_path = "mails"

 hostname = "0.0.0.0"

 port = 8025

 html = """\

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>email</title>

 </head>

 <body>

 <div><span>发件人: </span><span>{{ from_addr|e }}</span></div>

 <div><span>收件人: </span><span>{{ to_addr|e }}</span></div>

 <div><span>主题: </span><span>{{ subject }}</span></div>

 <div>

     {{ payload }}

 </div>

 </body>

 </html>

 """

 class ExampleHandler:

     async def handle_RCPT(self, server, session, envelope, address, rcpt_options):

         envelope.rcpt_tos.append(address)

         return "250 OK"

     async def handle_DATA(self, server, session, envelope: aiosmtpd.smtp.Envelope):

         message: Message = message_from_bytes(envelope.content)

         message_info = await self.parse_message(message)

         template = Template(html)

         if not os.path.exists(mail_path):

             os.makedirs(mail_path)

         with open(os.path.join(mail_path, f"mail_{datetime.now().strftime('%Y-%m-%d-%H_%M_%S_%f')[:-3]}.html"), "w") as f:

             f.write(template.render(message_info))

         return "250 Message accepted for delivery"

     def get(self, message, item):

         value = message.get(item)

         try:

             value = self.to_true_str(value)

         except Exception:

             pass

         return value

     async def parse_message(self, message: Message):

         self.charset = message.get_content_charset() or "utf-8"

         payload = message.get_payload()

         subject = self.get(message, "Subject")

         from_addr = self.get(message, "From")

         to_addr = self.get(message, "To")

         try:

             if isinstance(payload, (list, tuple)):

                 payload = self.parse_payload(payload)

         except Exception:

             pass

         return {"subject": subject, "payload": payload, "from_addr": from_addr, "to_addr": to_addr}

     def parse_payload(self, payload):

         # todo 暂时不处理附件的问题,目前仅处理 text/html 与 text/plain 共存的情况

         data = None

         for item in payload:

             if isinstance(item, Message):

                 data = item.get_payload()

                 if item.get_content_type == "text/html":

                     break

         try:

             # 测试发现 html 有概率是转 base64

             data = self.to_true_str(data)

         except Exception:

             pass

         return data

     def to_true_str(self, raw: str, charset=None):

         if raw.startswith("=?"):

             tmp_list = raw.split("?")

             if len(tmp_list) > 2:

                 raw = tmp_list[-2]

             charset = tmp_list[1]

         else:

             charset = self.charset

         return base64.b64decode(raw).decode(charset)

     async def handle_EHLO(self, *args, **kwargs):

         return """\

 250-mail

 250-PIPELINING

 250-AUTH LOGIN PLAIN

 250-AUTH=LOGIN PLAIN

 250-coremail

 250-STARTTLS

 250-SMTPUTF8

 250 8BITMIME"""

 class MyServer(Server):

     @syntax("AUTH PLAIN")

     @asyncio.coroutine

     def smtp_AUTH(self, PLAIN, *args, **kwargs):

         yield from self.push("235 auth successfully")

     @syntax("EHLO hostname")

     async def smtp_EHLO(self, hostname):

         status = await self._call_handler_hook("EHLO", hostname)

         self.session.host_name = hostname

         await self.push(status)

 class MyController(Controller):

     def factory(self):

         return MyServer(self.handler)

 async def amain(loop):

     controller = MyController(ExampleHandler(), hostname=hostname, port=port)

     controller.start()

 if __name__ == "__main__":

     logging.basicConfig(level=logging.ERROR)

     loop = asyncio.get_event_loop()

     loop.create_task(amain(loop=loop))

     try:

         loop.run_forever()

     except KeyboardInterrupt:

         pass

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