node.js – 从Amazon S3通过NodeJS服务器传递文件而不暴露S3 URL？

以下是使用multer进行上传的完整示例.

var express = require('express');
var app = express();
var router = express.Router();
var multer = require('multer');
var upload = multer({
  dest: "tmp/"
});
var fs = require('fs');
var async = require('async');
var AWS = require('aws-sdk');
// Configure AWS SDK here
var s3 = new AWs.s3({
  params: {
    Bucket: 'xxx'
  }
});

/**
 * Authentication middleware
 *
 * It will be called for any routes starTing with /files
 */
app.use("/files",function (req,res,next) {
  var authorized = true; // use custom logic here
  if (!authorized) {
    return res.status(403).end("not authorized");
  }
  next();
});

// Route for the upload
app.post("/files/upload",upload.single("form-field-name"),res) {
  var fileInfo = console.log(req.filE);
  var fileStream = fs.readFileSync(fileInfo.path);
  var options = {
    Bucket: 'xxx',Key: 'yyy/'+filename,Body: fileStream
  };

  s3.upload(options,function (err) {
    // Remove the temporary file
    fs.removeFileSync("tmp/"+fileInfo.path); // ideally use the async version
    if (err) {
      return res.status(500).end("Upload to s3 Failed");
    }
    res.status(200).end("File uploaded");
  });
});

// Route for the download
app.get("/files/download/:name",res) {
  var filename = req.params.name;
  if (!fileName) {
    return res.status(400).end("missing file name");
  }
  var options = {
    Bucket: 'xxx',Key: 'yyy/'+filename
  };
  res.attachment(fileName);
  s3.getObject(options).createReadStream().pipe(res);
});

app.listen(3000);

显然,这只是部分测试,缺乏正确的错误处理 – 但希望它能让你大致了解如何实现它.