如何在羽毛中分離中間件？

Question

我用上傳文件帶有羽毛的multer庫。 我嘗試將邏輯與代碼分開，我希望將上傳代碼放在index.js中，但在我的情況下，在中間件目錄中的pdf.js中。

下面是我的作品index.js：

'use strict';

const pdf = require('./pdf');
const record = require('./record');
const records = require('./records');

const handler = require('feathers-errors/handler');
const notFound = require('./not-found-handler');
const logger = require('./logger');

const uploadPdf = require('./upload-pdf');

module.exports = function() {
  // Add your custom middleware here. Remember, that
  // just like Express the order matters, so error
  // handling middleware should go last.

  const app = this;

  app.use('/rekord/:id.html', record(app));
  app.use('/rekordy.html', records(app));
  app.use('/pdf/:id', uploadPdf.single('file'), pdf(app));

  app.use(notFound());
  app.use(logger(app));
  app.use(handler());
};

這是upload-pdf.js文件：

  var multer  = require('multer')

  var storagePdf = multer.diskStorage({
    destination: 'public/pdf',
    filename: function (req, file, cb) {

      var id = req.params.id

      cb(null, id+'.pdf')
    }
  });

  module.exports = multer({
      storage: storagePdf,
      fileFilter: function (req, file, cb) {
        if (file.mimetype !== 'application/pdf') {
          return cb(null, false, new Error('I don\'t have a clue!'));
        }
      cb(null, true);
     }
     });

和pdf.js文件：

'use strict';

module.exports = function(app) {
  return function(req, res, next) {

    if (req.file) {
      return res.end('Thank you for the file');
    }
    return res.end('false');

    next();

  };
};

我想將upload-pdf.js和pdf.js組合成一個文件

Answer 1

特別是Feathers不一樣，就像任何其他Express應用程序一樣，您可以將代碼放入自己的模塊中：

'use strict';

const pdf = require('./pdf');
const record = require('./record');
const records = require('./records');

const handler = require('feathers-errors/handler');
const notFound = require('./not-found-handler');
const logger = require('./logger');

module.exports = function() {
  // Add your custom middleware here. Remember, that
  // just like Express the order matters, so error
  // handling middleware should go last.

  const app = this;

  app.use('/rekord/:id.html', record(app));
  app.use('/rekordy.html', records(app));
  app.use('/pdf/:id', pdf.upload.single('file'), pdf.process(app));

  app.use(notFound());
  app.use(logger(app));
  app.use(handler());
};

在pdf.js ：

'use strict';

var multer = require('multer')

var storagePdf = multer.diskStorage({
  destination: 'public/pdf',
  filename: function(req, file, cb) {

    var id = req.params.id

    cb(null, id + '.pdf')
  }
});

exports.upload = multer({
  storage: storagePdf,
  fileFilter: function(req, file, cb) {
    if (file.mimetype !== 'application/pdf') {
      return cb(null, false, new Error('I don\'t have a clue!'));
    }
    cb(null, true);
  }
});

exports.process = function(app) {
  return function(req, res, next) {

    if (req.file) {
      return res.end('Thank you for the file');
    }
    return res.end('false');

    next();
  };
};

NodeJS模塊系統文檔非常有助於了解它們如何組合在一起。