如何获得直接URL到通过Node.js上传的多部分文件

问题描述

我希望将文件发布到多部分表单中，然后将其上传到Amazon S3 Bucket，并返回到该文件的用户链接.

I wish to post file to multipart form and upload it to Amazon S3 Bucket and return to user link to the file.

const express = require('express'),
    aws = require('aws-sdk'),
    bodyParser = require('body-parser'),
    multer = require('multer'),
    multerS3 = require('multer-s3');

aws.config.update({
    secretAccessKey: 'secret',
    accessKeyId: 'secret',
    region: 'us-east-2'
});

const app = express(),
    s3 = new aws.S3();

app.use(bodyParser.json());

const upload = multer({
    storage: multerS3({
        s3: s3,
        bucket: 'some-name',
        key: (req, file, cb) => {
            console.log(file);
            cb(null, file.originalname); //use Date.now() for unique file keys
        }
    })
});

app.post('/upload', upload.array('file',1), (req, res, next) => {
    res.send("How to return File URL?");
});

app.listen(3000);

如何获得文件的直接URL?

How can I have the direct URL to the file?

推荐答案

( Multer NPM )已在文档中写过:

(Multer NPM) has already written there in documentation:

接受名称为fieldname的单个文件.单个文件将存储在 req.file 中.

Accept a single file with the name fieldname. The single file will be stored in req.file.

app.post('/upload', upload.single('file'), (req, res, next) => {
    console.log('Uploaded!');
    res.send(req.file);
});

.array(fieldname [，maxCount])= (必需文件)

接受文件数组，所有文件的名称均为fieldname.如果上传的文件超过maxCount，则可以选择出错.文件数组将存储在 req.files 中.

app.post('/upload', upload.array('file', 1), (req, res, next) => {
    console.log('Uploaded!');
    res.send(req.files);
});

.fields(fields)==> (必需文件)

接受由字段指定的文件混合.具有文件数组的对象将存储在 req.files

app.post('/upload', upload.fields([
  { name: 'avatar', maxCount: 1 },
  { name: 'gallery', maxCount: 8 }
]), (req, res, next) => {
    console.log('Uploaded!');
    res.send(req.files);
});

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