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const functions = require('firebase-functions');const Busboy = require('busboy');const XLSX = require('xlsx');
// // Create and Deploy Your First Cloud Functions// // https://firebase.google.com/docs/functions/write-firebase-functions//exports.helloWorld = functions.https.onRequest((request, response) => { response.send("Hello from Firebase!");});
exports.main = functions.https.onRequest((req, res) => {  var bb = new Busboy({    headers: {      'content-type': req.headers['content-type']    }  });  let fields = {};  let files = {};  bb.on('field', (fieldname, val) => {    fields[fieldname] = val;  });  bb.on('file', (fieldname, file, filename) => {    var buffers = [];    file.on('data', (data) => {      buffers.push(data);    });    file.on('end', () => {      files[fieldname] = [Buffer.concat(buffers), filename];    });  });  bb.on('finish', () => {    let f = files[Object.keys(files)[0]];    const wb = XLSX.read(f[0], { type: "buffer" });    // Convert to CSV    res.send(XLSX.utils.sheet_to_csv(wb.Sheets[wb.SheetNames[0]]));  });  bb.end(req.body)});