使用 aws-sdk 和 Node/Express 将简单的文件上传到 S3 [英] Simple file upload to S3 using aws-sdk and Node/Express

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本文介绍了使用 aws-sdk 和 Node/Express 将简单的文件上传到 S3的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我不知道我做错了什么，这是我所拥有的:

HTML

<身体><form method="POST" action="/upload" enctype="multipart/form-data"><div class="field"><label for="image">图片上传</label><input type="file" name="image" id="image">

<input type="submit" class="btn" value="Save"></表单>

Port 5000 是我的 Node.js 服务器的端口.

在这个例子中，我使用 POST 到 /upload，它工作正常.

module.exports = function(app, models) {var fs = require('fs');var AWS = require('aws-sdk');var accessKeyId = process.env.AWS_ACCESS_KEY ||"xxxxxx";var secretAccessKey = process.env.AWS_SECRET_KEY ||"+xxxxxx+B+xxxxxx";AWS.config.update({accessKeyId: accessKeyId,秘密访问密钥:秘密访问密钥});var s3 = 新的 AWS.S3();app.post('/上传', 函数(req, res){变量参数 = {桶:'makerquest'，密钥:'myKey1234.png',身体:你好"};s3.putObject(params, function (perr, pres) {如果(perr){console.log("上传数据出错:", perr);} 别的 {console.log("成功上传数据到 myBucket/myKey");}});});}

现在我要发布我正在POST的文件，这就是问题出现的地方.

module.exports = function(app, models) {var fs = require('fs');var AWS = require('aws-sdk');var accessKeyId = process.env.AWS_ACCESS_KEY ||"xxxxxx";var secretAccessKey = process.env.AWS_SECRET_KEY ||"+xxxxxx+B+xxxxxx";AWS.config.update({accessKeyId: accessKeyId,秘密访问密钥:秘密访问密钥});var s3 = 新的 AWS.S3();app.post('/上传', 函数(req, res){var path = req.files.image.path;fs.readFile(路径，函数(错误，file_buffer){变量参数 = {桶:'makerquest'，密钥:'myKey1234.png'，正文:file_buffer};s3.putObject(params, function (perr, pres) {如果(perr){console.log("上传数据出错:", perr);} 别的 {console.log("成功上传数据到 myBucket/myKey");}});});});}

我得到的错误是:

<块引用>

类型错误:无法读取未定义的属性路径"

事实上files是完全空的.

我假设我遗漏了一些很明显的东西，但我似乎找不到.

解决方案

你需要像 multer 这样的东西来处理分段上传.以下是使用 aws-sdk 将文件上传流式传输到 s3 的示例.

var multer = require('multer');var AWS = require('aws-sdk');var accessKeyId = process.env.AWS_ACCESS_KEY ||"xxxxxx";var secretAccessKey = process.env.AWS_SECRET_KEY ||"+xxxxxx+B+xxxxxx";AWS.config.update({accessKeyId: accessKeyId,秘密访问密钥:秘密访问密钥});var s3 = 新的 AWS.S3();app.use(multer({//https://github.com/expressjs/multerdest: './public/uploads/',限制:{文件大小:100000}，重命名:函数(字段名，文件名){返回文件名.replace(/W+/g, '-').toLowerCase();},onFileUploadData:函数(文件、数据、请求、资源){//文件 : { fieldname, originalname, name, encoding, mimetype, path, extension, size, truncated, buffer }变量参数 = {桶:'makerquest'，键:文件名，正文:数据};s3.putObject(params, function (perr, pres) {如果(perr){console.log("上传数据出错:", perr);} 别的 {console.log("成功上传数据到 myBucket/myKey");}});}}));app.post('/上传', 函数(req, res){if(req.files.image !== undefined){//`image` 是表单中的字段名称res.redirect("/上传");//成功}别的{res.send("错误，没有选择文件");}});

I am at a loss of what I am doing wrong, here is what I have:

HTML

<html>
<body>
    <form method="POST" action="/upload" enctype="multipart/form-data">
        <div class="field">
            <label for="image">Image Upload</label>
            <input type="file" name="image" id="image">
        </div>
        <input type="submit" class="btn" value="Save">
    </form>
</body>
</html>

Port 5000 is my Node.js server's port.

In this example I am using POST to /upload, and it works fine.

module.exports = function(app, models) {

    var fs = require('fs');
    var AWS = require('aws-sdk');
    var accessKeyId =  process.env.AWS_ACCESS_KEY || "xxxxxx";
    var secretAccessKey = process.env.AWS_SECRET_KEY || "+xxxxxx+B+xxxxxxx";

    AWS.config.update({
        accessKeyId: accessKeyId,
        secretAccessKey: secretAccessKey
    });

    var s3 = new AWS.S3();

    app.post('/upload', function(req, res){

        var params = {
            Bucket: 'makersquest',
            Key: 'myKey1234.png',
            Body: "Hello"
        };

        s3.putObject(params, function (perr, pres) {
            if (perr) {
                console.log("Error uploading data: ", perr);
            } else {
                console.log("Successfully uploaded data to myBucket/myKey");
            }
        });
    });

}

Now I want to post the file that I am POSTing, which is where the problem arises.

module.exports = function(app, models) {

    var fs = require('fs');
    var AWS = require('aws-sdk');
    var accessKeyId =  process.env.AWS_ACCESS_KEY || "xxxxxx";
    var secretAccessKey = process.env.AWS_SECRET_KEY || "+xxxxxx+B+xxxxxxx";

    AWS.config.update({
        accessKeyId: accessKeyId,
        secretAccessKey: secretAccessKey
    });

    var s3 = new AWS.S3();

    app.post('/upload', function(req, res){
        var path = req.files.image.path;
        fs.readFile(path, function(err, file_buffer){
            var params = {
                Bucket: 'makersquest',
                Key: 'myKey1234.png',
                Body: file_buffer
            };

            s3.putObject(params, function (perr, pres) {
                if (perr) {
                    console.log("Error uploading data: ", perr);
                } else {
                    console.log("Successfully uploaded data to myBucket/myKey");
                }
            });
        });
    });
}

The error I get is:

TypeError: Cannot read property 'path' of undefined

As a matter of fact files is completely empty.

I am assuming I am missing something pretty obvious but I can't seem to find it.

解决方案

You will need something like multer to handle multipart uploading. Here is an example streaming your file upload to s3 using aws-sdk.

var multer = require('multer');
var AWS = require('aws-sdk');

var accessKeyId =  process.env.AWS_ACCESS_KEY || "xxxxxx";
var secretAccessKey = process.env.AWS_SECRET_KEY || "+xxxxxx+B+xxxxxxx";

AWS.config.update({
    accessKeyId: accessKeyId,
    secretAccessKey: secretAccessKey
});

var s3 = new AWS.S3();

app.use(multer({ // https://github.com/expressjs/multer
  dest: './public/uploads/', 
  limits : { fileSize:100000 },
  rename: function (fieldname, filename) {
    return filename.replace(/W+/g, '-').toLowerCase();
  },
  onFileUploadData: function (file, data, req, res) {
    // file : { fieldname, originalname, name, encoding, mimetype, path, extension, size, truncated, buffer }
    var params = {
      Bucket: 'makersquest',
      Key: file.name,
      Body: data
    };

    s3.putObject(params, function (perr, pres) {
      if (perr) {
        console.log("Error uploading data: ", perr);
      } else {
        console.log("Successfully uploaded data to myBucket/myKey");
      }
    });
  }
}));

app.post('/upload', function(req, res){
    if(req.files.image !== undefined){ // `image` is the field name from your form
        res.redirect("/uploads"); // success
    }else{
        res.send("error, no file chosen");
    }
});

这篇关于使用 aws-sdk 和 Node/Express 将简单的文件上传到 S3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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