如何为 CustomMessage_AdminCreateUser 触发器发送自定义消息？

Question

发送用于触发器的自定义电子邮件时CustomMessage_AdminCreateUser，我成功更改了emailSubject从 Amazon Cognito 收到的事件中的属性，但似乎无法更改该emailMessage属性。

从 Cognito 发送的电子邮件包含正确的自定义主题，但该消息根本没有自定义，并且始终是 Cognito 池设置中设置的主题。

处理从 Cognito 接收到的事件的 lambda 处理程序成功地为这些触发器自定义了消息：

• CustomMessage_SignUp
• CustomMessage_ResendCode
• CustomMessage_ForgotPassword

但我似乎无法让它工作（至少不能完全）CustomMessage_AdminCreateUser触发。

我尝试将email_verified用户属性设置为true，以查看该属性是否取决于成功将自定义邮件发送到创建的用户。另外，我尝试在 Docker 容器中运行 lambda 以查看返回到 Cognito 的最终事件的输出，但该事件包含正确的数据，电子邮件主题和电子邮件消息都是自定义的。

def lambda_handler(event, context):
    if event['userPoolId'] == os.getenv('cognitoPoolId'):
        if CustomMessageTriggerEnum.has_value(event.get('triggerSource')):
            custom_message_trigger = CustomMessageTriggerEnum(event.get('triggerSource'))

            if custom_message_trigger == CustomMessageTriggerEnum.CustomMessageAdminCreateUser:
                custom_message_trigger = CustomMessageAdminCreateUser(event)
            else:
                return None

            custom_response = custom_message_trigger.get_custom_response(
                custom_message_trigger.ACTION,
                custom_message_trigger.EMAIL_SUBJECT,
                custom_message_trigger.EMAIL_MESSAGE
            )
            event = custom_message_trigger.set_custom_response(**custom_response)

            return event

class CustomMessageAdminCreateUser(BaseCustomMessageTrigger):
    """ Custom message admin create user trigger """

    ACTION = "changepassword"
    EMAIL_SUBJECT = "Welcome to {service}"
    EMAIL_MESSAGE = "Your account has been created. <a href='{0}'>Click here</a> to set your password and start using {service}."

    def __init__(self, event):
        super().__init__(event)

class BaseCustomMessageTrigger():
    """ Base custom message trigger """
    def __init__(self, event):
        self.event = event

    def get_custom_response(self, action, email_subject, email_message):
        """ Gets custom response params as dictionary """
        request = self.event.get('request')
        custom_response = {}
        url = self.get_url(
            action=action,
            code=request.get('codeParameter'),
            email=urlencode({'email': request['userAttributes'].get('email')})
        )
        custom_response['emailSubject'] = email_subject
        custom_response['emailMessage'] = email_message.format(url)

        return custom_response

    def set_custom_response(self, **kwargs):
        """ Updates the event response with provided kwargs """
        response = self.event.get('response')
        response.update(**kwargs)

        return self.event

    def get_url(self, action, code, email):
        """ Used for constructing URLs. """
        rawUrl = 'https://{0}/{1}?code={2}&{3}'
        return rawUrl.format(domain, action, code, email)

Answer 1

只是为了澄清电子邮件实际上应包含event.request.usernameParameter和中的值event.request.codeParameter中的值。

我发现 Cognito 忽略了我的电子邮件正文，因为令牌{username}虽然{####}存在，但丢失了。

Answer 2

您必须避免在响应参数上使用 urlencode，因为 Lambda 将添加占位符，稍后这些占位符将被 Cognito 替换。