Wix Code - Google Calendar API Backend File config

gcpBackend.js

import wixData from 'wix-data';
const {google} = require("googleapis");

const SCOPES = ['https://www.googleapis.com/auth/calendar']; //the url of the api

let options = {
	"suppressAuth": true //suppress db auth to allow secure db permissions
};

//-----------------------------Insert Client Config File Into Database----------------------------//

export async function client(config) {
	let response = await wixData.query("config").eq('title', 'client config').find(options);
	if (response.items.length === 0) {
		const toInsert = {
			"title": "client config",
			"value": config
		};
		response = await wixData.insert("config", toInsert);
		return;
	}

	let items = response.items;
	let item = items[0];
	let updated;
	const toUpdate = {
		"_id": item._id,
		"title": "client config",
		"value": config
	};
	return await wixData.update("config", toUpdate, options);
}

//-----------------------------Get Link For Access Token----------------------------//

export async function getAuthUrl() {
	const oAuth2Client = await createClient();
	const res = oAuth2Client.generateAuthUrl({
		access_type: 'offline',
		scope: SCOPES,
	})
	return Promise.resolve(res);
}

export async function createClient() {
	let val = await getClientConfig();
	let credentials = JSON.parse(val);
	const { client_secret, client_id, redirect_uris } = credentials.installed;
	return new google.auth.OAuth2(client_id, client_secret, redirect_uris[0]);
}

export async function getClientConfig() {
	const response = await wixData.query("config").eq('title', 'client config').find(options);
	if(response.items.length === 0) return null;
	return response.items[0].value;
}

//-----------------------------Generate Tokens For Accessing Google Calendar API----------------------------//

export async function generateTokens(offlineCode) {
	const authClient = await createClient();
	return authClient.getToken(offlineCode, async (err, tokenJson) => {
		if (err) {
			console.log(err);
		} else {
			let response = await wixData.query("config").eq('title', 'refresh token').find(options);
			if (response.items.length === 0) {
				const toInsert = {
					"title": "refresh token",
					"value": JSON.stringify(tokenJson)
				};
				response = await wixData.insert("config", toInsert);
				return;
			}

			let items = response.items;
			let item = items[0];
			const toUpdate = {
				"_id": item._id,
				"title": "refresh token",
				"value": JSON.stringify(tokenJson)
			};
			const ret = await wixData.update("config", toUpdate, options);
		}
	})
}