The Build Series: E1 - Contact Form powered by Firebase Functions

index.ts

import * as functions from 'firebase-functions';
const { google } = require('googleapis');
const express = require('express');
const cors = require('cors');

const app = express();

// Automatically allow cross-origin requests
app.use(cors({ origin: true }));

const privatekey = require('./private-key.json');

// configure a JWT auth client
const jwtClient = new google.auth.JWT(privatekey.client_email, null, privatekey.private_key, ['https://www.googleapis.com/auth/spreadsheets']);
const spreadsheetId = 'SHEET_ID';
const sheetName = 'Sheet1'
const sheets = google.sheets('v4');

const authorizeAndDoNext = async () => {
    await jwtClient.authorize();
    console.log('Successfully Conected');
}

export const ping = (request, response) => {
    response.send('Hello from the other side');
}

/**
 * Write data to sheet
 * @param data {name,email,message}
 */
export const writeToSheet = async (data) => {
    return await sheets.spreadsheets.values.append({
        auth: jwtClient,
        spreadsheetId: spreadsheetId,
        range: sheetName,
        valueInputOption: 'RAW',
        insertDataOption: 'INSERT_ROWS',
        resource: {
            values: [
                [data.name, data.email, data.message]
            ],
        },
    });
}

/**
 * The secret sauce.
 */
export const contact = async (request, response) => {
    try {
        await authorizeAndDoNext();
        const result = await writeToSheet(request.body);
        response.status(200).send(result.data);
    } catch (error) {
        console.log('Error', error);
        response.status(400).send(error);
    }
}

app.get('/ping', (req, res) => res.send('Hello from the other side'));
app.post('/contact', contact);

export const api = functions.https.onRequest(app);