salix/print/methods/csv/invoice/download.js

const path = require('path');
const db = require('vn-print/core/database');

const {toCSV} = require('../csv');
const sqlPath = path.join(__dirname, 'sql');

module.exports = async function(request, response, next) {
    try {
        const reqArgs = request.query;
        if (!reqArgs.refFk)
            throw new Error('The argument refFk is required');

        const refFk = reqArgs.refFk;
        const sales = await db.rawSqlFromDef(`${sqlPath}/sales`, [refFk]);
        const content = toCSV(sales);
        const fileName = `invoice_${refFk}.csv`;

        response.setHeader('Content-type', 'text/csv');
        response.setHeader('Content-Disposition', `inline; filename="${fileName}"`);
        response.end(content);
    } catch (error) {
        next(error);
    }
};