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index.js
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index.js
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'use strict';
var http = require('http');
var fs = require('fs');
var formidable = require("formidable");
var util = require('util');
var nodemailer = require('nodemailer');
var dotenv = require('dotenv');
// Init dotenv
dotenv.config();
// check for required env vars
if (!process.env.EMAIL_HOST || !process.env.EMAIL_PORT || !process.env.EMAIL_USER || !process.env.EMAIL_PASS || !process.env.TO) {
console.log('Missing required env vars. Please set EMAIL_HOST, EMAIL_PORT, EMAIL_USER, EMAIL_PASS and TO.');
process.exit(1);
}
const TOKEN_FIELD = process.env.TOKEN_FIELD || 'token'
const [TO_STRING, TO_TOKENS] = getToWithTokens(process.env.TO);
console.log('TO_STRING:', TO_STRING, 'TO_TOKENS:', TO_TOKENS);
const defaultDisclaimer = 'A form has been submited on your website. This is an automated email. Please do not reply to this email.';
// setup the server
// listen on port specified by the `PORT` env var
var server = http.createServer(function (req, res) {
if (req.method.toLowerCase() == 'get') {
displayForm(res);
} else if (req.method.toLowerCase() == 'post') {
//processAllFieldsOfTheForm(req, res);
processFormFieldsIndividual(req, res);
}
});
var port = process.env.PORT || 8080;
server.listen(port);
console.log("server listening on ", port);
// serve HTML file
// located according to the `FORM` env var
function displayForm(res) {
fs.readFile(process.env.FORM || 'form.html', function (err, data) {
res.writeHead(200, {
'Content-Type': 'text/html',
'Content-Length': data.length
});
res.write(data);
res.end();
});
}
// get the email addresses from the `TO` env var
// @example TO="email1@domain,email2@domain"
// @example TO="{ \"token1\": \"email1@domain\", \"token2\": \"email2@domain\" }"
function getToWithTokens(to) {
try {
console.log('to:', to);
return [null, JSON.parse(to)];
} catch (e) {
console.error('Error parsing TO:', e);
return [to, null];
}
}
function getTo(fields) {
const to = TO_STRING || TO_TOKENS[fields[TOKEN_FIELD]]
if (!to) {
console.error('No email address found in the form', { TO_STRING, TO_TOKENS, TOKEN_FIELD }, `Add a field named ${TOKEN_FIELD} with a value that matches one of the tokens in the TO env var`);
return
}
console.log('to:', to);
return to
}
// get the POST data
// and call the sendMail method
function processAllFieldsOfTheForm(req, res) {
var form = new formidable.IncomingForm();
form.parse(req, function (err, fields, files) {
//Store the data from the fields in your data store.
//The data store could be a file or database or any other store based
//on your application.
res.writeHead(200, {
'content-type': 'text/plain'
});
res.write('received the data:\n\n');
res.end(util.inspect({
fields: fields,
files: files
}));
});
}
function processFormFieldsIndividual(req, res) {
//Store the data from the fields in your data store.
//The data store could be a file or database or any other store based
//on your application.
var fields = [];
var form = new formidable.IncomingForm();
form.on('field', function (field, value) {
fields[field] = value;
});
const referer = `${req.headers['x-forwarded'] || req.headers['x-forwarded-for'] || req.headers['referer'] || req.headers['origin'] || req.headers['host'] || 'your website'}`;
form.on('end', function () {
let text;
try {
text = createHtmlEmailBody(fields, referer);
} catch (e) {
console.error('Error creating email body:', e);
res.writeHead(500, { 'content-type': 'text/html' });
res.end('Error creating email body');
return;
}
let to;
try {
to = getTo(fields);
} catch (e) {
console.error('Error getting email address:', e);
res.writeHead(400, { 'content-type': 'text/html' });
res.end('Error getting email address');
return;
}
try {
sendMail(text, to, referer);
} catch (e) {
console.error('Error sending email:', e);
res.writeHead(500, { 'content-type': 'text/html' });
res.end('Error sending email');
return;
}
if(process.env.REDIRECT && fields.thanks) {
if(!process.env.REDIRECT_DOMAINS.split(',').includes(new URL(fields.thanks).hostname)) {
console.error(`Redirect domain not allowed: ${new URL(fields.thanks).hostname}`);
res.writeHead(500, { 'content-type': 'text/html' });
res.write('Redirect domain not allowed');
res.end();
return;
}
console.log('Redirecting to:', fields.thanks);
res.writeHead(302, {
'Location': fields.thanks,
});
res.end();
return;
}
res.writeHead(200, { 'content-type': 'text/html' });
res.write(process.env.MESSAGE || 'Thank you for your submission.');
res.end();
});
form.parse(req);
}
function createHtmlEmailBody(fields, referer) {
return `
<p>A new form submission was received from your website ${referer || 'your website'}</p>
<table border="1" cellpadding="5" cellspacing="0">
<tr><th>Field</th><th>Value</th></tr>
${Object.keys(fields).map(field => `<tr><td>${field}</td><td>${fields[field]}</td></tr>`).join('')}
</table>
<p>${process.env.DISCLAIMER || defaultDisclaimer}</p>
`
}
// setup the email sender
// uses the nodemailer lib
// sends the email to the adress found in the `TO` env var
let transporter = nodemailer.createTransport({
host: process.env.EMAIL_HOST,
port: process.env.EMAIL_PORT,
secure: process.env.EMAIL_PORT === 465, // secure:true for port 465, secure:false for port 587
auth: {
user: process.env.EMAIL_USER,
pass: process.env.EMAIL_PASS
}
});
function sendMail(text, to, referer) {
// setup email data with unicode symbols
const mailOptions = {
from: process.env.FROM || 'Email form data bot <[email protected]>',
to,
subject: 'New form submission' + (referer ? ' from your website ' + referer : ''),
text: text
};
console.log('sending email: ', 'from:', process.env.FROM, 'to:', to, 'site name:', referer);
// send mail with defined transport object
transporter.sendMail(mailOptions, (error, info) => {
if (error) {
return console.log(error);
}
console.log('Message %s sent: %s', info.messageId, info.response);
});
}