Google Drive API - Upsert file . create or update a file

upload.js

"use strict";

const fs = require("fs");
const path = require("path");
const { google } = require("googleapis");

const SCOPES = ["https://www.googleapis.com/auth/drive"];
const KEYFILE_PATH = "config/credentials.json";
const FOLDER_ID = "14DHCIe3CHdWSX_Z3PHPwsow-fVHE9ApG";

const auth = new google.auth.GoogleAuth({
  keyFile: KEYFILE_PATH,
  scopes: SCOPES,
});
const driveService = google.drive({ version: "v3", auth });

async function checkIfFileExists(filename) {
  const response = await driveService.files.list({
    pageSize: 1,
    q: `name = '${filename}'`,
  });
  if (response.data.files && response.data.files.length === 0) return false;
  return response.data.files[0].id;
}

exports.upload = async function upload(filenamePath) {
  const filename = filenamePath.split(path.sep).pop();
  const metadata = {
    name: filename,
    parents: [FOLDER_ID],
  };

  const media = {
    mimeType: "text/plain",
    body: fs.createReadStream(__dirname + filenamePath),
  };

  // upsert
  const fileId = await checkIfFileExists(filename);
  let response;
  if (fileId) {
    console.log("existing file. Overwriting...", fileId);
    response = await driveService.files.update({
      fileId,
      media,
      fields: "id",
    });
  } else {
    response = await driveService.files.create({
      resource: metadata,
      media,
      fields: "id",
    });
  }

  if (response.status !== 200) {
    console.log(response);
    throw new Error("Error uploading files to Google Drive");
  }

  console.log("file uploaded", response.data.id);
  return response.data.id;
};