Google App Engine：然后接收电子邮件并转发它？

Question

我有一个应用引擎应用，它接收电子邮件并将其元数据发送到脚本进行处理。它运作良好。代码如下，由 Google 通过 Github 示例提供。

但是，问题是，我如何将通过此脚本（或一般的 App Engine）收到的电子邮件转发到另一个电子邮件地址？

特别是，对于使用 Gmail 向我转发电子邮件的客户，我希望收到他们的转发请求，以便我作为人类管理员批准他们。

import webapp2
import logging
import urllib
import json

from google.appengine.ext.webapp.mail_handlers import InboundMailHandler
from google.appengine.api import urlfetch


class HandleEmail(InboundMailHandler):
    def receive(self, message):

        # parse out fields
        to = message.to
        sender = message.sender
        cc = getattr(message, 'cc', '')
        date = message.date
        subject = message.subject

        # Original message, as a python email.message.Message
        original = str(message.original)

        html_body = ''
        for _, body in message.bodies('text/html'):
            html_body = body.decode()

        plain_body = ''
        for _, plain in message.bodies('text/plain'):
            plain_body = plain.decode()

        # Attachements are EncodedPayload objects, see
        # https://code.google.com/p/googleappengine/source/browse/trunk/
        # python/google/appengine/api/mail.py#536
        attachments = [{
                        'filename': attachment[0],
                        'encoding': attachment[1].encoding,
                        'payload': attachment[1].payload
                       }
                       for attachment
                       in getattr(message, 'attachments', [])]

        # logging, remove what you find to be excessive
        logging.info('sender: %s', sender)
        logging.info('to: %s', to)
        logging.info('cc: %s', cc)
        logging.info('date: %s', date)
        logging.info('subject: %s', subject)
        logging.info('html_body: %s', html_body)
        logging.info('plain_body: %s', plain_body)
        logging.info('attachments: %s', [a['filename'] for a in attachments])

        # POST (change to your endpoint, httpbin is cool for testing though)
        # url = 'http://httpbin.org/post'
        url = 'https://myapp.appspot.com/receiver.php'

        form_fields = urllib.urlencode({
          'sender': sender.encode('utf8'),
          'to': to.encode('utf8'),
          'cc': cc.encode('utf8'),
          'date': date.encode('utf8'),
          'subject': subject.encode('utf8'),
          'html_body': html_body.encode('utf8'),
          'plain_body': plain_body.encode('utf8'),
          'original': original.encode('utf8'),
          'attachments': json.dumps(attachments)
        })

        headers = {
            'Content-Type': 'application/x-www-form-urlencoded; charset=utf-8'
        }

        result = urlfetch.fetch(url=url,
                                method=urlfetch.POST,
                                payload=form_fields,
                                headers=headers)

        # log more
        logging.info('POST to %s returned: %s', url, result.status_code)
        logging.info('Returned content: %s', result.content)

application = webapp2.WSGIApplication([HandleEmail.mapping()], debug=True)

Answer 1

如前所述，您可以在当前类中使用 mail.send_mail() 函数来实现此目的。

from google.appengine.api import app_identity #[ If you want current user as the sender ]
from google.appengine.api import mail

def forward_mail(sender_address,forward_address,original_message,html_body,original_attachments):
    # [START forward_mail]
    message = mail.EmailMessage(
        subject= original_message.subject,
        to = forward_address,
        sender = original_message.sender,
        body = html_body,
        attachments = original_attachments
    )   

    message.send()
    # [END forward_mail]

然后在你的 HandleEmail 类中调用这个函数。

希望对你有帮助