nodejs，multer，aws S3 [英] nodejs, multer, aws S3

问题描述

如何应用uuid和date，以便数据库中存储的文件名和S3存储桶中存储的文件名相同?

How do i apply uuid and date so that the filename stored in my database and the filename stored in my S3 bucket are the same?

在当前的实现中，即使发布几小时后，uuid和日期也始终相同.

With this current implementation, the uuid and the date are always the same even if a post was made hours later.

有人可以帮忙，真的会很感激.

Can someone help, would really appreciate it.

const s3 = new AWS.S3({
 accessKeyId: process.env.AWS_ID,
 secretAccessKey: process.env.AWS_SECRET,
 region:process.env.AWS_REGION
 })

const uid =uuidv4();
const date =new Date().toISOString()

const multerS3Config = multerS3({
      s3: s3,
      bucket: process.env.AWS_BUCKET,
      metadata: function (req, file, cb) {
               cb(null, { fieldName: file.fieldname }); },
      shouldTransform: true,
      acl: 'public-read',
      contentType: multerS3.AUTO_CONTENT_TYPE,
      transforms: [
                  {
                    id: 'full',
                    key: (req, file, cb) => cb(null, file.originalname 
                         + "-"  + `${date}` + "-" + `${uid}` + 
                         "_full.jpg"),
                    transform: (req, file, cb) => cb(null, 
                               sharp().resize(2000).jpeg({ 
                               quality: 50 }))
                   },
                   {
                     id: 'thumb',
                     key: (req, file, cb) => cb(null, 
                          file.originalname + "-"  + 
                          `${date}` + "-" + `${uid}` + "_thumb.jpg"),
                     transform: (req, file, cb) => cb(null, 
                                sharp().resize(100).jpeg({ 
                                quality: 30 }))
                   },
                   ],
                });

const upload = multer({
storage: multerS3Config,
limits: { fieldSize: 25 * 1024 * 1024 },
});

这是我的发帖请求

router.post(
"/",
 [    upload.array("images", config.get("maxImageCount"))],
 async (req, res) => {
const paths = await req.files.map((file) => ({ originalName: file.originalname + "-" + 
`${date}` 
+ "-" + `${uid}`}));
await Post.create({
title: req.body.title,
userId: req.body.userId,
Post_Images: paths.map((x) => ({ images: x.originalName })),
},
{ 
include: [Post_Image] }).then(
res.status(201).send())

通过当前的实现，文件将同时存储在db和s3中.

With this current implementation the the files are getting stored in both the db and s3.

另外，我还有一个问题是使用multer和multer-s3有什么区别?我尝试使用multer将图像发布到s3，但是它不起作用，所以我使用了multer-s3并成功了.

Also, another question i have is what is the difference between using multer and multer-s3? I tried using multer to post the images to s3 but it did not work so i used multer-s3 and it worked.

更新

 const s3 = new AWS.S3({
 accessKeyId: process.env.AWS_ID,
 secretAccessKey: process.env.AWS_SECRET,
 region:process.env.AWS_REGION
 })

function getFilename() {
return new Date().toISOString() + '-' + uuidv4();
}

function getTransforms() {
const fileName = getFilename();
return {
transforms:[
  {
      id: 'full',
      key: (req, file, cb) => {
        let fname = file.originalname.split(".");
        cb(null, fname[0] + '-' + fileName + "_full.jpg")},
      transform: (req, file, cb) => cb(null,
          sharp().resize(2000).jpeg({
              quality: 50
          }))
  },
  {
      id: 'thumb',
      key: (req, file, cb) => {
        let fname = file.originalname.split(".");
        cb(null, fname[0] + '-' + fileName + "_thumb.jpg")},
      transform: (req, file, cb) => cb(null,
          sharp().resize(100).jpeg({
              quality: 30
          }))
  }
  ],
metadata: (req, file, cb) => {
let fname = file.originalname.split(".");
cb(null, { 
    fieldName: file.fieldname, 
    key: fname[0] + '-' + fileName
});
}}}

const multerS3Config = multerS3({
      s3: s3,
      bucket: process.env.AWS_BUCKET,
      shouldTransform: true,
      acl: 'public-read',
      contentType: multerS3.AUTO_CONTENT_TYPE,
      ...getTransforms()
      });

const upload = multer({
storage: multerS3Config,
limits: { fieldSize: 25 * 1024 * 1024 },
});

这是我的发帖请求

router.post(
"/",
 [    upload.array("images", config.get("maxImageCount"))],
 async (req, res) => {

const paths = await req.files.map((file) => ({ images: 
              file.transforms[0].metadata.key}));

await Post.create({
title: req.body.title,
userId: req.body.userId,
Post_Images: paths,
},
{ 
include: [Post_Image] }).then(
res.status(201).send())

我的问题是the date and uuid variables both will initialize when node server start, it never changes until your node server restarts

推荐答案

快速修复:

• 保持不变

const s3 = new AWS.S3({
    accessKeyId: process.env.AWS_ID,
    secretAccessKey: process.env.AWS_SECRET,
    region: process.env.AWS_REGION
});

• date和uuid变量都将在节点服务器启动时进行初始化，直到您的节点服务器重新启动时才更改，您只需将其放入函数中以在每次新文件名都返回时， li>
• 此处函数返回扩展名以外的文件名
• the date and uuid variables both will initialize when node server start, it will never change until your node server restart, you just need to put it in to a function to return every time new file name,
• here function returns filename except extension

function getFilename() {
    return new Date().toISOString() + '-' + uuidv4();
}

• 创建用于转换的函数，并从getFilename()函数在两个版本中传递相同的文件名，并在元数据中添加文件名，
• create function for transforms and pass same filename in both version from getFilename() function, add filename in metadata as well,

function getTransforms() {
    const fileName = getFilename();
    return {
        transforms: [
            {
                id: "full",
                key: (req, file, cb) => {
                    let fname = file.originalname.split(".")
                    cb(null, fname[0] + '-' + fileName + "_full.jpg")
                },
                transform: (req, file, cb) => cb(null, sharp().resize(2000).jpeg({ quality: 50 }))
            },
            {
                id: "thumb",
                key: (req, file, cb) => {
                    let fname = file.originalname.split(".")
                    cb(null, fname[0] + '-' + fileName + "_thumb.jpg")
                },
                transform: (req, file, cb) => cb(null, sharp().resize(100).jpeg({ quality: 30 }))
            }
        ],
        metadata: (req, file, cb) => {
            let fname = file.originalname.split(".");
            cb(null, { 
                fieldName: file.fieldname, 
                key: fname[0] + '-' + fileName + ".jpg"
            });
        }
    }
}

• 调用getTransforms()函数，该函数将返回转换和matadata属性
• 我不确定您的登录名是否将文件名存储在数据库中，
• 从元数据中传递的transfoems.metadata中获取名称，这将仅返回_全名，
• call getTransforms() function, that will return transforms and matadata properties
• i am not sure aboutyour login to store filename in database,
• get name from transfoems.metadata that we passed from metadata, this will return only _full name,

router.post("/", async (req, res) => {

    const multerS3Config = multerS3({
        s3: s3,
        bucket: process.env.AWS_BUCKET,
        shouldTransform: true,
        acl: 'public-read',
        contentType: multerS3.AUTO_CONTENT_TYPE,
        ...getTransforms()
    });

    const upload = multer({
        storage: multerS3Config,
        limits: { fieldSize: 25 * 1024 * 1024 }
    });

    upload.array("images", config.get("maxImageCount"))(req, res, async(error) => {
        const paths = await req.files.map((file) => ({
            images: file.transforms[0].metadata.key
        }));
        await Post.create({
            title: req.body.title,
            userId: req.body.userId,
            Post_Images: paths,
        }, {
            include: [Post_Image]
        })
    });
    
})

---

基本上，语句 AWS S3的multer-s3流式multer存储引擎.足以区分multer和multer-s3.

---

Basically the statement multer-s3 Streaming multer storage engine for AWS S3. is enough to differentiate both multer and multer-s3.

该代码尚未经过测试，您可以变通并查看发生了什么！

The code has not been tested, you can workaround and see what's happen!

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