How not to upload with form.parse() ?

[TayPark]

Context

• node version: 12.14.1
• module (formidable) version: canary
• environment (e.g. node, browser, native, OS): Nodenv, Chrome, WSL2, Win10 Pro
• used with (i.e. popular names of modules): express, mysql
• any other relevant information: -

What problem are you trying to solve?

I have a problem with using formidable, it's a simple but I can't find any site with this problem.

"In case I have a upload webapp with formidable, how not to upload an empty file? It always upload an empty file, title like upload_3f0934128511fd38dha1.... and no content"

I'm using this module like below in expressJS

router.post('/compose', async function (req, res, next) {  
if (req.body.imgFile == undefined ) { // no upload }
else {
    form.parse(req, async (err, fields, files) => {
    // some business logic
    }
}

but it doesn't work anyway. I think form.parse() has no option to not upload.

So if form.parse() in formidable has a function to make webapp upload or not, plz comment below. Or same function with same feature, plz comment

thx

[auto-comment]

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/cc @tunnckoCore @GrosSacASac

[tunnckoCore]

No possible at the moment. It should be in the v2 final. I had some idea about that, I just didn't jump on the code to test it.

[TayPark]

Hello again. I have a question. I'm also using form.parse() for passing req, but it doesn't work on this situation

router.post('/update',` async function (req, res, next) {
    console.log(req.body.imgFile); // some imgs, also req is passing here

    if ( some control words ) {
        form.parse(req, async function (err, fields, files) { 
            console.log(files) // nothing here, 
            console.log(req) // nothing here, too
        })
    }
});

Also, when I call form.parse(), images automatically uploaded on server, but it doesn't work anyway. How can I solve this? should I use .on() and .emit() instead?

[tunnckoCore]

I think the callback to parse cannot be async function, yea, use the event API.

[TayPark]

thx a lot XD

[xr0master]

I know it is old, but you can overwrite the logic, it's not so hard.
For example, I needed to get the buffer instead of saving the file.

import {IncomingForm, Part} from 'formidable';

export class FormParse extends IncomingForm {

  private handleFilePart(part: Part) {
    let chunks = [];

    part.on('data', (chunk) => {
      chunks.push(chunk);
    });

    part.on('end', () => {
      this.emit('field', part.name, {
        contentType: part.mime,
        filename: part.filename,
        content: Buffer.concat(chunks)
      });
    });
  }

  public onPart(part: Part) {
    if (part.filename === undefined) {
      this.handlePart(part);
    } else {
      this.handleFilePart(part);
    }
  }
}

[leonardovillela]

I will take a look at this issue during the weekend.