Image file upload with node.js - javascript

I'm trying to adapt my code to upload files, but I'm not getting it, I looked in the community and I didn't understand, I'm still new to this. It always falls on the error json return, do you know what it can be?
File where you have the logic
async img(request, response){
multer({
storage: multer.diskStorage({
destination: (req, file, cb) => {
cb(null, "./Uploads")
},
filename: (req, file, cb) => {
cb(null, Date.now().toString() + '-' + file.originalname)
},
fileFilter: (req, file, cb) => {
const extensionImg = ['image/png', 'image/jpg', 'image/jpeg'].find
(formatPermitted => formatPermitted == file.mimetype)
if(extensionImg){
return cb(null, true)
}
return cb(null, false)
}
})
}).single('image')
if(request.file){
return response.status(200).json({erro: false, message: "ok"});
}else{
return response.status(400).json({erro: true, message: "error"});
}
}
File where the route is
const IncidentsController = require('./controllers/IncidentsController');
const routes = express.Router();
routes.post('/uploads', IncidentsController.img)

multer(...).single(...) returns a middleware function. That middleware function that it returns has to be actually called in order to do something.
Typically, you would define the middleware outside a request handler and then use it as middleware on one or more request handlers.
const imgMulterMiddleware = multer({
storage: multer.diskStorage({
destination: (req, file, cb) => {
cb(null, "./Uploads")
},
filename: (req, file, cb) => {
cb(null, Date.now().toString() + '-' + file.originalname)
},
fileFilter: (req, file, cb) => {
const extensionImg = ['image/png', 'image/jpg', 'image/jpeg'].find
(formatPermitted => formatPermitted == file.mimetype)
if(extensionImg){
return cb(null, true)
}
return cb(null, false)
}
})
}).single('image');
Then, use that middleware as needed:
routes.post('/uploads', imgMulterMiddleware, (req, res) => {
// do something with req.file here which will be set
// by the middleware if it was successful
if (req.file) {
res.json({erro: false, message: "ok"});
} else {
res.status(400).json({erro: true, message: "error"});
}
});

Related

Uploading multiple files to multiple locations with Multer & Node.JS

I am trying to write an app using NodeJS and Express which will upload both a user avatar which is a single image (jpeg, png or webp) and 'legalDocs' which is essentially also a single file that can either be an image (jpeg, png or webp) or a pdf file. The avatar needs to be uploaded to ./resources/(userID)/userAvatar and the legal docs to ./resources/(userID)/legalDocs. Along with some other text info that will be posted along with the request as a multipart/form-data.
The userID is only generated after processing the text data posted.
Here's my current non-working code
APP.JS
//ENV
require("dotenv").config();
require("express-async-errors");
//EXPRESS
const express = require("express");
const server = express();
global.__basedir = __dirname;
//routes
const authRouter = require("./routes/authRoutes.js");
server.use(express.json());
server.use(express.urlencoded({extended: true}));
server.use(express.static("./public"));
server.use("/api/v0/auth", authRouter);
const port = process.env.PORT || 3000;
const start = async () => {
try {
server.listen(port, () => {
console.log(`--> Listening on port ${port}...`);
});
} catch (error) {
console.log(error);
console.log("Fatal error!");
}
}
start();
authRoutes.js:
const express = require("express");
const router = express.Router();
const {signupWithEmail} = require("../controllers/auth.js");
router.route("/signup").post(signupWithEmail);
module.exports = router;
../controllers/auth.js:
const multer = require("multer");
const processReq = require("../middleware/upload.js");
const signupWithEmail = async (req, res, next) => {
//Processing to get the ID happens here.
//For simplicity we can pretend like the ID is directly
//posted in a field with the name id.
const id = req.body.id;
console.log("id:");
console.log(id);
await processReq(id)(req, res, next);
res.status(200).send("done!");
}
upload.js
const multer = require("multer");
const errors = require("../errors");
const maxSize = 2 * 1024 * 1024;
const acceptableFileMIMETypes = ["image/jpeg", "image/png", "image/webp", "application/pdf"];
const userAvatarFilter = function (req, file, cb) {
if ((file.fieldname === "userAvatar" || file.fieldname === "legalDocs")
&& acceptableFileMIMETypes.includes(file.mimetype)
&& !(file.fieldname === "userAvatar" && file.mimetype === "application/pdf")) {
if (file.fieldname === "userAvatar") {
cb(null, true);
} else {
cb(null, false);
}
} else {
cb(new errors.BadRequestError("Both files are required, and must be JPEG, PNG, WEBP. Legal documents can also be PDF."));
}
}
const userlegalDocsFilter = function (req, file, cb) {
if ((file.fieldname === "userAvatar" || file.fieldname === "legalDocs")
&& acceptableFileMIMETypes.includes(file.mimetype)
&& !(file.fieldname === "userAvatar" && file.mimetype === "application/pdf")) {
if (file.fieldname === "userAvatar") {
cb(null, false);
} else {
cb(null, true);
}
} else {
cb(new errors.BadRequestError("Both files are required, and must be JPEG, PNG, WEBP. Legal documents can also be PDF."));
}
}
const uploadFunc = (id) => {
return (req, res, next) => {
const userAvatarStorage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, __basedir + `/resources/${id}/userAvatar`);
},
filename: (req, file, cb) => {
console.log("Uploaded avatar!");
console.log(file.originalname);
console.log(file);
cb(null, file.originalname);
}
});
const legalDocsStorage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, __basedir + `/resources/${id}/legalDocs`);
},
filename: (req, file, cb) => {
console.log("Uploaded legalDocs!");
console.log(file.originalname);
console.log(file);
cb(null, file.originalname);
}
});
const uploadAvatar = multer({
storage: userAvatarStorage,
limits: {
fileSize: maxSize,
files: 2
},
fileFilter: userAvatarFilter
}).any();
const uploadLegalDocs = multer({
storage: legalDocsStorage,
limits: {
fileSize: maxSize,
files: 2
},
fileFilter: userlegalDocsFilter
}).any();
uploadAvatar(req, res, next);
uploadLegalDocs(req, res, next);
next();
}
}
module.exports = uploadFunc;
The Problem
The first problem with my code is quite obvious, I cannot parse text data from the request unless it had been processed by multer (with the current code, console.logging the id shows that it's undefined), but I need the ID to be passed to multer in order to save the files to the correct directory. It seems like I need some way to process text only and generate the ID, then process the files.
The second problem is that, even if the ID is static - meaning that in ./controllers/auth.js the signupWithEmail function became:
const multer = require("multer");
const processReq = require("../middleware/upload.js");
const signupWithEmail = async (req, res, next) => {
const id = 1337;
console.log("id:");
console.log(id);
await processReq(id)(req, res, next);
res.status(200).send("done!");
}
I this is the output I get on the console when I try to post:
id:
1337
Uploaded legalDocs!
cours-analyse-numerique-ch1-21_22.pdf
{
fieldname: 'legalDocs',
originalname: 'cours-analyse-numerique-ch1-21_22.pdf',
encoding: '7bit',
mimetype: 'application/pdf'
}
node:_http_outgoing:771
throw new ERR_HTTP_HEADERS_SENT('remove');
^
Error [ERR_HTTP_HEADERS_SENT]: Cannot remove headers after they are sent to the client
at new NodeError (node:internal/errors:400:5)
at ServerResponse.removeHeader (node:_http_outgoing:771:11)
at write (C:\Users\der_u\source\repos\ATEEK\node_modules\finalhandler\index.js:282:9)
at AsyncResource.runInAsyncScope (node:async_hooks:204:9)
at listener (C:\Users\der_u\source\repos\ATEEK\node_modules\on-finished\index.js:170:15)
at onFinish (C:\Users\der_u\source\repos\ATEEK\node_modules\on-finished\index.js:101:5)
at callback (C:\Users\der_u\source\repos\ATEEK\node_modules\ee-first\index.js:55:10)
at IncomingMessage.onevent (C:\Users\der_u\source\repos\ATEEK\node_modules\ee-first\index.js:93:5)
at IncomingMessage.emit (node:events:513:28)
at endReadableNT (node:internal/streams/readable:1359:12) {
code: 'ERR_HTTP_HEADERS_SENT'
}
and only 'legalDocs' get uploaded.
Is there any way to solve these problems without using a temporary directory to save all the files then move them once the ID had been generated? And what does the [ERR_HTTP_HEADERS_SENT] error mean?

Multer next() funtion not a funtion

I'm developing this server based on this tutorial, https://www.bezkoder.com/angular-12-node-js-express-mysql/ now I'm in need of add some file upload functionalities, using Multer. but each time I try to us it, I get this error:
/home/miguel/Documents/angular_projs/examples/server/node_modules/multer/lib/make-middleware.js:45
next(err)
^
TypeError: next is not a function
at done (/home/miguel/Documents/angular_projs/examples/server/node_modules/multer/lib/make-middleware.js:45:7)
when i use it here:
//File upload configuration
const maxSize = 2 * 1024 * 1024;
let storage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, "/resources/static/assets/uploads/");
},
filename: (req, file, cb) => {
console.log(file.originalname);
cb(null, file.originalname);
},
});
let uploadFile = multer({
storage: storage,
limits: { fileSize: maxSize },
}).single("file");
/* ---------------------------------------------------------------------------------------------------- */
//Upload Files
exports.file_upload = async (req, res) => {
let number = req.params.number;
try {
await uploadFile(req, res);
if (req.file == undefined) {
return res.status(400).send({ message: "Please upload a file!" });
}
res.status(200).send({
message: "Uploaded the file successfully: " + req.file.originalname,
});
} catch (err) {
if (err.code == "LIMIT_FILE_SIZE") {
return res.status(500).send({
message: "File size cannot be larger than 2MB!",
});
}
res.status(500).send({
message: `Could not upload the file: ${req.file.originalname}. ${err}`,
});
}
//Check if empty
//res.status(200).json({msg:`${s03}`});
};
I've checked other tutorial and it's suppose to work
Try passing in next as a parameter.
...
exports.file_upload = async (req, res, next) => {
let number = req.params.number;
try {
await uploadFile(req, res, next);
...

Image upload isn't working using multer

I setup multer like this
let multer = require('multer');
let apiRoutes = express.Router();
let UPLOAD_PATH = '../uploads';
let storage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, UPLOAD_PATH);
},
filename: (req, file, cb) => {
cb(null, file.fieldname + '-' + Date.now());
}
});
let upload = multer({ storage: storage });
and in route I am getting data and an image and use multer like!
apiRoutes.post('/update', passport.authenticate('jwt', { session: false }), (request, response) => {
let record = {
name: request.body.name,
location: request.body.location,
about: request.body.about,
userid: request.body.userid,
avatar: request.body.filename
};
let userData = {
name: request.body.name
};
if (request.body.filename) {
upload(request, response, (error) => {
});
}
profile.findOneAndUpdate({ userid: request.body.userid }, record, {new: true}, (error, doc) => {
if (error) response.json(error);
user.findOneAndUpdate({ _id: request.body.userid }, record, (error, result) => {
if (error) throw error;
response.json(doc);
});
});
});
What is happening with this code is that when I do not send an image to backend then I get data from front end and store it into database. But when I send image along side data then it return POST /api/1.0/profile/update 401 0.396 ms - -.
It means I am not getting any data at all. Whats wring with the code here?
You can't use Multer in your /update route. Use Multer in your router like this:
var upload = multer({ dest: 'uploads/' })
apiRoutes.post('/profile', upload.single('image'), function (req, res, next) {
// Uploaaded
})
if you add it and still can't get our file, you should update your form with this parameter: enctype="multipart/form-data"

how to change the directory to save uploaded files in angular 2?

I'm using angular 2 and i have an uploader. the default folder to save the file is in /assets folder. is there any way to change this directory to a file server for example?
this is my .ts code:
uploader: FileUploader = new FileUploader({
url: '/upload/uploadUserImage',
isHTML5: true
});
and this is my .js file in backend:
const storageUserImage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, './src/assets/uploads/profile_images/');
},
filename: function (req, file, cb) {
cb(null, file.originalname);
}
});
const uploadUserImage = multer({
storage: storageUserImage
}).single('file');
////////////
module.exports = (router) => {
router.post('/uploadUserImage', function (req, res) {
uploadUserImage(req, res, function (err) {
if (err) {
res.json({
error_code: 1,
err_desc: err
});
return;
}
res.json({
error_code: 0,
err_desc: null
});
});
});
Yes according to multer documentation you have destination function in which you may define your path that where it should be stored.
var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, '/../../tmp/my-uploads') // source folder
},
filename: function (req, file, cb) {
cb(null, file.fieldname + '-' + Date.now())
}
})

Node.js: Multer upload with promise?

I have this express route with multer file-upload. When the upload is complete, I would like to encode the image to base64 and send with response.
However when I do it like this, the code tries to execute the base64 encoding before the file is created to the folder.
Edit: Added storage & upload functions
const storage = multer.diskStorage({
destination: (req, file, callback) => {
if (!fs.existsSync('./uploads')) {
fs.mkdirSync('./uploads');
}
let path = './uploads';
callback(null, path);
},
filename(req, file, cb) {
let fileExt = file.originalname.substring(file.originalname.lastIndexOf('.')).toLowerCase();
if (!imageFilter(fileExt)) {
return false;
} else {
cb(null, file.originalname);
}
},
onError: function (err, next) {
console.log('error', err);
next(err);
},
});
const upload = multer({
storage,
limits: {
fileSize: 1000 * 1000 * 2 // 2 MB
}
}).single('file');
router.post('/upload', function (req, res) {
var directory = 'uploads';
fs.readdir(directory, (err, files) => {
if (err) throw err;
for (var file of files) {
fs.unlink(path.join(directory, file), err => {
if (err) throw err;
});
}
});
upload(req, res, function (err) {
if (err) {
return res.status(404).json({
success: false,
message: 'File is too large. (Max 2MB)'
});
}
var file = req.file;
var base64str = base64_encode('./uploads/' + file.originalname);
return res.status(200).json({
success: true,
url: 'http://' + ip.address() + ':' + constants.PORT + '/api/uploads/' + file.originalname,
image: 'data:image/png;base64,' + base64str
});
});
});
What would be the smartest way to achieve the right order of operations. Possibly promises or async/await?
This solution worked for me :
Node v8.4.0 is required for this
//app.js
const fs = require('fs');
const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const app = express();
app.use(cors({credentials: true, origin: 'http://localhost:4200'}));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
const Uploader = require('./Uploader.js');
const uploader = new Uploader();
app.post('/upload', uploader.startUpload);
//Uploader.js
const util = require("util");
const crypto = require("crypto");
const multer = require('multer');
class Uploader {
constructor() {
const storageOptions = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, __dirname + '/uploads/')
},
filename: function(req, file, cb) {
crypto.pseudoRandomBytes(16, function(err, raw) {
cb(null, raw.toString('hex') + Date.now() + '.' + file.originalname);
});
}
});
this.upload = multer({ storage: storageOptions });
}
async startUpload(req, res) {
let filename;
try {
const upload = util.promisify(this.upload.any());
await upload(req, res);
filename = req.files[0].filename;
} catch (e) {
//Handle your exception here
}
return res.json({fileUploaded: filename});
}
}
Edit :
The library "util" provide you a "promisify" method which will give you the possibility to avoid something called the "callback hell". It converts a callback-based function to a Promise-based one.
This is a small example to understand my code above:
const util = require('util');
function wait(seconds, callback) {
setTimeout(() => {
callback();
}, seconds);
}
function doSomething(callType) {
console.log('I have done something with ' + callType + ' !');
}
// Default use case
wait(2 * 1000, () => {
doSomething('callback');
});
const waitPromisified = util.promisify(wait);
// same with promises
waitPromisified(2000).then((response) => {
doSomething('promise');
}).catch((error) => {
console.log(error);
});
// same with async/await
(async () => {
await waitPromisified(2 * 1000);
doSomething('async/await');
})();
Will print :
I have done something with callback !
I have done something with promise !
I have done something with async/await !

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