Multer trying to create a new folder when one already exists - javascript

I'm using Multer to manage image uploads, and when running my app on my local machine everything works perfectly. But now that I'm trying to deploy to Heroku I get this error in my application logs:
Unhandled rejection Error: EROFS: read-only file system, mkdir
'/public'
...which seems like it's trying to create a directory rather than using the existing one (like it does on my local machine)
This is my the code I'm using for Multer:
var storage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, 'public/img/') },
filename: (req, file, cb) => {
cb(null, new Date().toISOString() + file.originalname)
} })
var upload = multer({storage: storage})
router.post('/:propertyid', upload.single('img'), function(req, res) {
Property.update({
img: req.file.filename
}, {
where: {
id: req.params.propertyid,
}
}).then(updatedProperty => {
res.redirect('/admin/' + updatedProperty)
})
});
The public/img directory already exists and when testing it, it runs fine with correct filenames and end up in the correct place. Any help is appreciated! Thanks!

Heroku dynos have an ephemeral filesystem. This answer by Naaman Newbold, explains very well what that means.
TL;DR:
Dynos' filesystem shouldn't be used to store any permanent storage or data besides what is deployed. In order to do use a storage, AWS S3 can be used.

You can Use fs-extra to create folder it will sync and create folder like below in below code I am creating directory by user_id and uploading multiple images so i have used fs.mkdirsSync(path) in my code
let fs = require('fs-extra');
let storage = multer.diskStorage({
destination: function (req, file, cb) {
let Id = req.body.id;
let path = `tmp/daily_gasoline_report/${Id}`;
fs.mkdirsSync(path);
cb(null, path);
},
filename: function (req, file, cb) {
// console.log(file);
let extArray = file.mimetype.split("/");
let extension = extArray[extArray.length - 1];
cb(null, file.fieldname + '-' + Date.now() + "." + extension);
}
})

Related

How to resolve path issues while moving files in node.js?

I am trying to get a file from html form and store it in another folder. It's basically cloud function, and I am new to both node.js and firebase so don't know what I am doing wrong. What I manage to do is:
const fileMiddleware = require('express-multipart-file-parser');
app.post("/sendMail", (req, res) => {
const {
fieldname,
filename,
encoding,
mimetype,
buffer,
} = req.files[0];
console.log(req.files[0].originalname);
var fs = require('fs')
var oldPath = req.files[0].originalname;
var newPath = '/functions/'+oldPath;
fs.rename(oldPath, newPath, function (err) {
if (err) throw err
console.log('Successfully renamed - AKA moved!')
});
});
Whenever I try to move file, I got path issues. The error is as follows:
[Error: ENOENT: no such file or directory, rename 'C:\Users\Maisum Abbas\now\functions\sendMail.txt'
> 'C:\functions\sendMail.txt'] {
> errno: -4058,
> code: 'ENOENT',
> syscall: 'rename',
> path: 'C:\\Users\\Maisum Abbas\\now\\functions\\sendMail.txt',
> dest: 'C:\\functions\\sendMail.txt'
> }
Also, this is the path where I want to actually move the file but oldpath is already setup like this.
C:\Users\Maisum Abbas\now\functions\sendMail.txt
Since I needed to attach a file with email, it was causing path issues. I tried it with multer and it works. What I did:
//call libraries here
var storage = multer.diskStorage({
destination: function (req, file, callback) {
callback(null, 'resume/');
},
filename: function (req, file, callback) {
callback(null, file.fieldname + '-' + Date.now());
}
});
var upload = multer({ storage : storage}).single('filetoupload');
app.post("/careerMail", (req, res) => {
const { name } = req.body;
const { email } = req.body;
const { phone } = req.body;
upload(req,res,function(err) {
if(err) {
return res.end("Error uploading file.");
}
});
const dest = 'mymail';
const mailOptions = {
from: email, // Something like: Jane Doe <janedoe#gmail.com>
to: dest,
subject: 'Candidate Application', // email subject
html: `<div>
<strong>From:</strong> ` +
name +
`<br /><br />
<strong>Email:</strong> ` +
email +
`<br /><br />
<strong>Phone:</strong> ` +
phone +
`<br /><br />
</div>
`,// email content in HTML
attachments: [
{
filename: req.files[0].originalname,
content: req.files[0].buffer.toString("base64"),
encoding: "base64"
}
]
and rest of the code...
I suggest rethinking this approach altogether. You won't be able to move files around in a deployed function. The nodejs runtime filesystem doesn't allow any files to be written anywhere in the filesystem, except for os.tmpdir() (which is /tmp on Linux).
If you need to write a file temporarily, you should definitely only use that tmp space. Be aware that files written there occupy memory and should be deleted before the function terminates, or you could leak memory.
You can read files that you deployed with your code, but you should do that through relative paths.
I ran into same problem while moving file. I sort this problem by using a function to get the application root folder and then concatenate rest of the location.
//place this file on application root.
//import where you need to get the root path.
const path = require('path');
module.exports = (function(){
return path.dirname(require.main.filename || process.mainModule.filename);
})();
//taking your case move location.
const rootPath = //require the above module.
const newPath = rootPath + /functions/' +oldPath;
fs.rename(oldPath, newPath, function (err) {
if (err) throw err
console.log('Successfully renamed - AKA moved!')
});

Error using fastify-multer to upload images

I am trying to use the fastify-multer plugin to upload files to the server and I am able to successfully get the images uploaded to the folder.
The problem is my app crashes.
I used the fastify-cli generated structure and I am running it as a standalone server as mentioned in the README.md here.
I am writing it as a fastify plugin.
"use strict";
const fp = require("fastify-plugin");
module.exports = fp(function(fastify, opts, next) {
fastify.decorate("uploadImage", function(request) {
const path = require("path");
const multer = require("fastify-multer");
var storage = multer.diskStorage({
destination: path.join(path.join(__dirname + "/uploads/")),
filename: function(request, file, cb) {
cb(null, file.originalname);
}
});
var upload = multer({ storage }).single("myImage");
upload(request, function(err) {
if (err) {
console.log(err);
} else {
console.log("Saved...");
return { saved: true };
}
});
});
next();
});
And here is the error I get :
Hi looked into your issue. You are using fastify-multer in the wrong way.
Invoking multer({ storage }).single("myImage") you are creating a fastify's preHandler hook that accepts 3 specific parameters. You can find more on the offical documentation. A simple working example could be the one you can see at fastify-multer:
const server = fastify()
// register fastify content parser
server.register(multer.contentParser)
server.route({
method: 'POST',
url: '/profile',
preHandler: upload.single('avatar'),
handler: function(request, reply) {
// request.file is the `avatar` file
// request.body will hold the text fields, if there were any
reply.code(200).send('SUCCESS')
}
})
If you need more help just provide me a repro repo on github and I'll try to figure out what is the best solution for your case.
Let me know! :)

Full control over files sent with ajax in nodejs

I use multer to parse multiple files sent as multipart/data-form with axios
...
const storage = multer.diskStorage({
destination: './gallery',
filename(req, file, cb) {
(1) ....
},
});
const upload = multer({ storage });
router.post('/products', upload.array('images'), (req, res, next) => {
Product.create(...)
.then((product) => {
(2) ...
})
.catch(..)
})
...
at this point everything is fine and my images are saved.
the problem is that i want to make a loop in (1) or (2) and name my files like this
files.forEach((file, index) => {
// rename file to => product_id + '_' + index + '.jpeg'
}
For example if i have 3 files they will be named to
5a9e881c3ebb4e1bd8911126_1.jpeg
5a9e881c3ebb4e1bd8911126_2.jpeg
5a9e881c3ebb4e1bd8911126_3.jpeg
where 5a9e881c3ebb4e1bd8911126 is the id of the product document saved by mongoose.
how to solve this naming issue ?
is multer the best solution cause i want full control over my files ?
Is there a better approach with another node package ?
is it good to send images as multipart/data-form or data URL base64 ?
This is easy, as long as you understand how express works. So before jumping to solution its important to have a clear understanding.
When you have a express code like below
router.post('/abc', function(req, res) {res.send('hello world');})
Express passes the request from chains of middlewares/functions. Now each function gets req, res, next parameters. The next is function, which a middleware is suppose to call when the processing is complete. If the middleware decides not to call next the request ends there and no more middlewares are called further.
When we used function(req, res) {res.send('hello world');}, we didn't take the next parameter at all, which means we are not interested in any other code to do anything. Now getting back to our problem
router.post('/products', upload.array('images'), (req, res, next) => {...}
You have used upload.array('images') first and then your actual product creation code. So I would show two approaches to solve this problem
One more middleware to rename the files
router.post('/products', upload.array('images'), (req, res, next) => {
Product.create(...)
.then((product) => {
req.product = product
next();
})
.catch(..)
}, (req, res, next) => {
//Get the product id using req.product
//Move the files as per the name you desire
})
Reverse the processing order
In this approach you first create the product and then let image processing happen. I have created a sample for the showing the same
let express = require('express');
let bodyParser = require('body-parser');
app = express();
let multer = require('multer');
const storage = multer.diskStorage({
destination: './gallery',
filename: (req, file, cb) => {
console.log('Product id - ' + req.product_id);
cb(null, req.product_id + '.js');
},
});
const upload = multer({ storage });
app.all('/', (req, res, next) => {
console.log('Hello you');
promise = new Promise((resolve) => {
// simulate a async product creation
setTimeout(() => resolve(1234), 100);
});
promise.then((product_id) => {
console.log('create the product and get the new product id')
// set the product id in the request object, so the multer
// filename function can access it
req.product_id = product_id;
res.send('uploaded files');
if (next)
next();
});
}, upload.array('images'));
module.exports = {
app
};
app.listen(8020);
And testing it using postman works fine
Edit: 19-Mar-2018
For multiple files you can easily update your filename function code like below
const storage = multer.diskStorage({
destination: './gallery',
filename: (req, file, cb) => {
req.file_id = req.file_id || 0;
req.file_id++;
console.log('Product id - ' + req.product_id);
cb(null, req.product_id +'_' + req.file_id +'.js');
},
});
This will make sure that you get all the files for that product. Now coming to your questions
how to solve this naming issue ?
This answer already does that
is multer the best solution cause i want full control over my files ?
I can't say, as long it works and does what you want, it should be good enough
Is there a better approach with another node package ?
I couldn't find lot of packages. But you can explore this if you want
is it good to send images as multipart/data-form or data URL base64 ?
I would use multipart/data-form, so that no base64 conversion is needed at client side. But again this is a matter of opinion as well.
You can't set the name purely in (1) since at that point you do not know the ID of the product yet.
You can't set the name purely in (2) since at that point the files have already been saved (with filename generated by your filename(req, file, cb) function).
So I think the best solution might be to move the files after they are uploaded.
This could be done in (2). When you process the files in the router, req.files will be an array of files that have already been uploaded.
In your promise callback for Product.create, you have access to the product (which you need for the ID) and the list of files (which you need for the number).
For that, you could use fs.rename(oldPath, newPath, callback).
https://nodejs.org/docs/latest/api/fs.html#fs_fs_rename_oldpath_newpath_callback
Something like this should work:
Product.create(...).then((product) => {
req.files.forEach((file, index) => {
// file.path is the full path to the file that was uploaded.
// newPath is where you want to put it.
// Let's use the same destination and just change the filename.
const newPath = file.destination + product.id + '_' + index
fs.rename(file.path, newPath)
})
})

Is there any option to reduce the image size and resize the image in nodejs with multer functionality?

var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, '/tmp/my-uploads')
},
filename: function (req, file, cb) {
cb(null, file.fieldname + '-' + Date.now())
}
})
var upload = multer({ storage: storage })
I need to resize the image and compress the image size to lowest and upload into the directory.Any help?
You can create a customized Storage Engine for multer.
According to the official documentation, custom Storage Engines are classes that expose two functions: _handleFile and _removeFile.
Here is the official template for creating a custom Storage Engine (Link):
var fs = require('fs')
function getDestination (req, file, cb) {
cb(null, '/dev/null')
}
function MyCustomStorage (opts) {
this.getDestination = (opts.destination || getDestination)
}
MyCustomStorage.prototype._handleFile = function _handleFile (req, file, cb) {
this.getDestination(req, file, function (err, path) {
if (err) return cb(err)
var outStream = fs.createWriteStream(path)
file.stream.pipe(outStream)
outStream.on('error', cb)
outStream.on('finish', function () {
cb(null, {
path: path,
size: outStream.bytesWritten
})
})
})
}
MyCustomStorage.prototype._removeFile = function _removeFile (req, file, cb) {
fs.unlink(file.path, cb)
}
module.exports = function (opts) {
return new MyCustomStorage(opts)
}
You can reduce the image size on the _handleFile function before saving it to the disk.
For reducing the image size you can choose form a variety of npm modules which do this job. Some modules worth checking are Sharp, Light-weight image processor and GraphicsMagick for node.
This can be done using multer-imager npm module.
http://www.npmjs.com/package/multer-imager
make sure you install graphicsmagick before that(not npm module).
Click on the link below to install graphicsmagick.
http://linuxg.net/how-to-install-graphicsmagick-1-3-18-on-ubuntu-13-10-13-04-12-10-12-04-linux-mint-16-15-14-13-pear-os-8-7-and-elementary-os-0-2/
Then install multer-imager and gm npm module.

Multer : Setting different destinations in the destination Property

I have a case where I need to store images in different directories . So I have set the multer as.
app.use(multer({
dest: path.join(__dirname, '`public/assets/img/profile`'),
rename: function (fieldname, filename, req, res) {
if(req.session.user) return req.session.user.id;
else if(req.session.doctor) return req.session.doctor.id;
}
}));
However I need more destinations to store images.
public/assets/img/picture1
I have seen similar questions but I could not understand any of them.
Any help would be greatfull.
Your example is from quite old version of multer. I strongly recommend you to use latest version (due to security reasons).
If you are sure that you need old version then just add to your multer options:
app.use(multer({
//...
changeDest: function(dest, req, res) {
return dest + '/user1';
}
//...
}));
More details you will get in documentation (link to old version) link
Newest version of multer works a little different. This would be to big offtopic to write in detail how to use new version of multer. You easily will find in stackoverflow answer or from actual version of documentation link
I only write how to change destination directory (example from docs):
var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, '/tmp/my-uploads')
},
filename: function (req, file, cb) {
cb(null, file.fieldname + '-' + Date.now())
}
})
var upload = multer({ storage: storage })
app.post('/profile', upload.single('picture'), function (req, res, next) {
// req.file is the `picture` file
// req.body will hold the text fields, if there were any
})

Categories

Resources