使用 Meteor + Multer 接收多部分表单数据？答案

【问题标题】：Receiving Multi-Part Form Data with Meteor + Multer?使用 Meteor + Multer 接收多部分表单数据？
【发布时间】：2019-08-12 15:26:00
【问题描述】：

我有面向express 的示例代码，用于从提供者接收多部分表单数据：

const multer = require('multer');
const callback = multer();

app.post('/callback', callback.single('json'), (req, res) => {
  res.status(200);
  res.send('API Event Received');

  const data = req.body.json;
  const events = JSON.parse(data);
  const eventType = events.event.event_type;
  const signatureRequestId = events.signature_request.signature_request_id;

  switch(eventType) {
    case 'signature_request_sent':
      console.log(`Signature request ${signatureRequestId} has been sent.`);
      break;
    case 'signature_request_viewed':
      console.log(`Signature request ${signatureRequestId} has been viewed.`);
      break;
    case 'signature_request_downloadable':
      console.log(`Signature request ${signatureRequestId} is downloadable.`);
      break;
    case 'signature_request_signed':
      console.log(`Signature request ${signatureRequestId} has been signed.`);
      break;
    case 'signature_request_declined':
      console.log(`Signature request ${signatureRequestId} has been declined.`);
      break;
    default:
      console.log('');
      break;
  }

});

在this SO post, 上，我看到了一个将 Meteor 连接到 Multer 以接收图像文件的示例：

if (Meteor.isServer) {
  Meteor.startup(function () {
    multer({ dest: './uploads/',
        rename: function (fieldname, filename) {
            return filename+Date.now();
        },
        onFileUploadStart: function (file) {
            console.log(file.originalname + ' is starting ...');
        },
        onFileUploadComplete: function (file) {
            console.log(file.fieldname + ' uploaded to  ' + file.path);
            var fileName = file.name;
            var done=true;
        }
    })
  });
}

...但我还没有想出如何组合这两个代码示例。

在 Meteor 中使用 Multer 接收多部分表单数据的正确方法是什么？

更新：一位评论者问我到目前为止做了什么。我有这个创建常规单部分 REST 端点的 Meteor 代码：

WebApp.connectHandlers.use('/ReceiveCalls', (req, res, next) => {
    console.log('received message');
    console.log( req);
    console.log(res);
    res.writeHead(200);
});

上面显示的 Multer 示例包含一个用于接收图像的目标文件夹，但它没有显示如何创建端点。 Meteor 代码展示了如何创建一个 REST 端点，但我还看不到如何将它与 Multer 代码结合起来。我敢肯定这很容易，但我还没有弄清楚怎么做。

【问题讨论】：

到目前为止您尝试过什么？有什么错误吗？
@Jankapunkt，我已经更新了原始帖子，提供了我迄今为止尝试过的信息。

标签： node.js meteor multipartform-data multer

【解决方案1】：

这是答案，via coagmano on the Meteor forum：

注意：如果它可能对其他人有用，提供者是 HelloSign。这是我完成的代码。

//TELL HELLOSIGN THE CALLBACK URL
const hellosign = require('hellosign-sdk')({key: 'xxxxx'});
hellosign.account.update({
    callback_url: 'https://example.com/myCallBackURL'
}).then((res) => {
    console.log('success setting hellosign account callback url');
}).catch((err) => {
    console.log('error setting hellosign account callback url');
    console.log(err)
});

//REST API FOR HELLOSIGN
const callback = multer({dest: './uploads'});

// Mount the middleware first so it's run first
WebApp.connectHandlers.use('/myCallBackURL', callback.single('json'));

// Then mount the user handler
WebApp.connectHandlers.use('/myCallBackURL', (req, res, next) => {
    res.setHeader('Content-Type', 'text/html');
    res.setHeader('X-Foo', 'bar');
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('Hello API Event Received');

    const data = req.body.json;
    const events = JSON.parse(data);
    const eventType = events.event.event_type;
    const signatureRequestId = events.signature_request.signature_request_id;

    switch (eventType) {
        case 'signature_request_sent':
            console.log(`Signature request ${signatureRequestId} has been sent.`);
            break;
        case 'signature_request_viewed':
            console.log(`Signature request ${signatureRequestId} has been viewed.`);
            break;
        case 'signature_request_downloadable':
            console.log(`Signature request ${signatureRequestId} is downloadable.`);
            break;
        case 'signature_request_signed':
            console.log(`Signature request ${signatureRequestId} has been signed.`);
            break;
        case 'signature_request_declined':
            console.log(`Signature request ${signatureRequestId} has been declined.`);
            break;
        default:
            console.log('');
            break;
    }
});

【讨论】：