getFile.js

exports.uploadFile = async (req, res, next) => {
    if (!req.file) {
        return res.status(422).json({
            error: 'File needs to be provided.',
        });
    }

    const mime = req.file.mimetype;
    if (mime.split('/')[0] !== 'image') {
        fs.unlink(req.file.path);

        return res.status(422).json({
            error: 'File needs to be an image.',
        });
    }

    const fileSize = req.file.size;
    if (fileSize > MAX_SIZE) {
        fs.unlink(req.file.path);

        return res.status(422).json({
            error: `Image needs to be smaller than ${MAX_SIZE} bytes.`,
        });
    }

    const data = fs.readFileSync(req.file.path);
    return ipfs.add(data)
        .then((file) => {
            if (file) {
                req.data = file;
                next();
            } else {
                res.status(400).send('Error processing file');
            }
        })
        .catch((err) => {
            res.status(500).send(err.message);
        });
};