在ExpressJS中,我想下载以前上传到Amazon S3存储桶的文件。
这是我目前的路线:
const express = require('express');
const AWS = require('aws-sdk');
const mammoth = require('mammoth');
const fs = require('fs').promises
const path = require('path')
const router = express.Router();
router.put('/:id/download', async (req, res, next) => {
console.log('hitting download route')
var id = req.params.id;
let upload = await Upload.query().findById( id ).eager('user');
console.log("file to download is: ", upload.name)
AWS.config.update({
accessKeyId: process.env.AWS_ACCESS_KEY_ID,
secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
});
const s3 = new AWS.S3();
// var fileStream = fs.createWriteStream('/tmp/file.docx');
// var s3Stream = s3.getObject(params).createReadStream();
const downloadFromS3 = async () => {
const params = {
Bucket: process.env.AWS_BUCKET,
Key: upload.file_url.split("com/").reverse()[0]
};
const { Body } = await s3.getObject(params).promise()
await fs.writeFile(`${ __dirname }/download.docx`, Body)
return Body
}
// mammoth.convertToHtml({ path: '/Users/dariusgoore/Downloads/1585930968750.docx' })
// .then(async function(result) {
// await Upload.query().findById( id )
// .patch({
// html: result.value,
// conversion_messages: result.messages
// })
// res.json(result);
// })
// .done();
res.send(downloadFromS3)
});
我没有收到任何错误,但是没有创建该文件,或者如果我手动创建该文件,它仍然为空。
如果我已正确理解您的问题,则问题是您没有等待将文件写入本地文件系统,而是通过express在响应中将其返回。
尝试一下此代码。
const express = require('express')
const AWS = require('aws-sdk')
const mammoth = require('mammoth')
const fs = require('fs').promises
const path = require('path')
const router = express.Router()
const s3 = new AWS.S3()
AWS.config.update({
accessKeyId: process.env.AWS_ACCESS_KEY_ID,
secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
})
const downloadFromS3 = async (key, location) => {
const params = {
Bucket: process.env.AWS_BUCKET,
Key: key,
}
const { Body } = await s3.getObject(params).promise()
await fs.writeFile(location, Body)
return true
}
router.put('/:id/download', async (req, res, next) => {
console.log('hitting download route')
const upload = await Upload.query()
.findById(req.params.id)
.eager('user')
console.log('file to download is: ', upload.name)
const key = upload.file_url.split('com/').reverse()[0]
const location = `${__dirname}/${key}.docx`
await downloadFromS3(key, location)
res.send({ key, location })
})
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