I am trying to use Gmail API for sending emails from my website. Insight of this guideline and attempting to replace the third-party sending service from sendGrid to Gmail in the guideline, I did the followings:
1- Creating the two files “email.jsw” and “index.js”
2- Changing ‘key, ‘sender’, and ‘recipient’ in the ‘email.jsw’ file and putting the ‘index’ content of step 3 in this link inside the export function ‘sendWithService’.
However, several error highlights, ‘not defined’, appear in the ‘index.js’ file, which is related to ‘const fs’, ‘const readline’, ‘const {google}’, and ‘process’.
When I execute the code by pushing the submit button an error message shows up in the ‘Developer console’: Cannot find module ‘googleapis’.
The only step that I skipped, is step 2 that is ‘Install the client library’, which I assume we don’t need that since we use Wix.
Could you please tell me where am I make mistakes?
Here are the codes
In email.jsw
//email.jsw
import { sendWithService } from 'backend/index';
export function sendEmail(subject, body) {
const key = "MY_API_KEY";
const sender = "from.MY_ADDRESS@gmail.com";
const recipient = "to.ANOTHER_ADDRESS@gmail.com";
return sendWithService(key, sender, recipient, subject, body);
}
export function sendEmailWithRecipient(subject, body, recipient) {
const key = "MY_API_KEY";
const sender = "from.MY_ADDRESS@gmail.com";
return sendWithService(key, sender, recipient, subject, body);
}
In index.js
import { fetch } from 'wix-fetch';
export function sendWithService(key, sender, recipient, subject, body) {
const fs = require('fs');
const readline = require('readline');
const { google } = require('googleapis');
// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/gmail.readonly'];
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
const TOKEN_PATH = 'token.json';
// Load client secrets from a local file.
fs.readFile('credentials.json', (err, content) => {
if (err) return console.log('Error loading client secret file:', err);
// Authorize a client with credentials, then call the Gmail API.
authorize(JSON.parse(content), listLabels);
});
/**
* Create an OAuth2 client with the given credentials, and then execute the
* given callback function.
* @param {Object} credentials The authorization client credentials.
* @param {function} callback The callback to call with the authorized client.
*/
function authorize(credentials, callback) {
const { client_secret, client_id, redirect_uris } = credentials.installed;
const oAuth2Client = new google.auth.OAuth2(
client_id, client_secret, redirect_uris[0]);
// Check if we have previously stored a token.
fs.readFile(TOKEN_PATH, (err, token) => {
if (err) return getNewToken(oAuth2Client, callback);
oAuth2Client.setCredentials(JSON.parse(token));
callback(oAuth2Client);
});
}
/**
* Get and store new token after prompting for user authorization, and then
* execute the given callback with the authorized OAuth2 client.
* @param {google.auth.OAuth2} oAuth2Client The OAuth2 client to get token for.
* @param {getEventsCallback} callback The callback for the authorized client.
*/
function getNewToken(oAuth2Client, callback) {
const authUrl = oAuth2Client.generateAuthUrl({
access_type: 'offline',
scope: SCOPES,
});
console.log('Authorize this app by visiting this url:', authUrl);
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
});
rl.question('Enter the code from that page here: ', (code) => {
rl.close();
oAuth2Client.getToken(code, (err, token) => {
if (err) return console.error('Error retrieving access token', err);
oAuth2Client.setCredentials(token);
// Store the token to disk for later program executions
fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
if (err) return console.error(err);
console.log('Token stored to', TOKEN_PATH);
});
callback(oAuth2Client);
});
});
}
/**
* Lists the labels in the user's account.
*
* @param {google.auth.OAuth2} auth An authorized OAuth2 client.
*/
function listLabels(auth) {
const gmail = google.gmail({ version: 'v1', auth });
gmail.users.labels.list({
userId: 'me',
}, (err, res) => {
if (err) return console.log('The API returned an error: ' + err);
const labels = res.data.labels;
if (labels.length) {
console.log('Labels:');
labels.forEach((label) => {
console.log(`- ${label.name}`);
});
} else {
console.log('No labels found.');
}
});
}
}
