当用户通过 fb 页面或 WhatsApp 发布消息时，我会自动向用户回复预定义的欢迎消息。我希望如果用户已经存在于阳光中，那么不要回复该用户，否则用欢迎消息回复他们。如何检查用户是否已经存在？'使用严格';
// Imports
`enter code here`const express = require('express');
const bodyParser = require('body-parser');
const SunshineConversationsApi = require('sunshine-conversations-client');
var request = require('request')
// Config
let defaultClient = SunshineConversationsApi.ApiClient.instance;
let basicAuth = defaultClient.authentications['basicAuth'];
basicAuth.username = 'app_XXXXXXX';
basicAuth.password = 'XXXXXXXXXXXXXXXXX-bSwG85aM8qldJzTt4rgZlf_XQukWKE8ADMno85g';
const PORT = 5050;
const apiInstance = new SunshineConversationsApi.MessagesApi()
// Server https://expressjs.com/en/guide/routing.html
const app = express();
app.use(bodyParser.json());
// Expose /messages endpoint to capture webhooks
https://docs.smooch.io/rest/#operation/eventWebhooks
app.post('/messages', function(req, res) {
console.log('webhook PAYLOAD:\n',
JSON.stringify(req.body.events[0].payload.conversation.id, null, 4));
const appId = req.body.app.id;
const trigger = req.body.events[0].type;
// Call REST API to send message https://docs.smooch.io/rest/#operation/postMessage
if (trigger === 'conversation:message') {
const authorType = req.body.events[0].payload.message.author.type;
const displayName=req.body.events[0].payload.message.author.displayName;
if(authorType === 'user'){
const conversationId = req.body.events[0].payload.conversation.id;
console.log(conversationId);
console.log(displayName);
check_conversation_ID_with_sunshine(appId,conversationId);
//sendMessage(appId, conversationId);
res.end();
}
}
});
// Listen on port
app.listen(PORT, () => {
console.log(`App listening on port ${PORT}`);
});
async function sendMessage(appId, conversationId){
let messagePost = new SunshineConversationsApi.MessagePost();
messagePost.setAuthor({type: 'business'});
messagePost.setContent({type: 'text', text: 'Thanks boy'});
let response = await apiInstance.postMessage(appId, conversationId, messagePost);
//console.log('API RESPONSE:\n', response);
}