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const bodyParser = require('body-parser');
const dotenv = require('dotenv');
const express = require('express');
const { MessagingResponse } = require('twilio').twiml;
dotenv.config();
const { isSubscribed, getSubscriptions, getSubscriptionFromNumber, subscribe, load: loadData, unsubscribe } = require('./db');
const { sendTextMessage } = require('./sendTextMessage');
const { route, port, appName } = require('./config');
loadData();
const app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.post(route, (req, res) => {
/** @type {string} */
const body = req.body.Body.trim();
const bodyLowerCase = body.toLocaleLowerCase();
/** @type {string} */
const senderPhoneNumber = req.body.From;
/** @type {string} */
const senderCountry = req.body.FromCountry;
console.debug(`
Received a text from ${senderCountry} on number ${senderPhoneNumber}.
Message content: ${body}. End of message
`.replace(/\s+/g, ' '));
if (isSubscribed(senderPhoneNumber)) {
if (['ls', 'list'].includes(bodyLowerCase)) {
const twiml = new MessagingResponse();
twiml.message(
getSubscriptions()
.map(({ name, number }) => `${name} (${number})`)
.join(', ')
);
res.type('text/xml').send(twiml.toString());
return;
}
if (['exit', 'unsubscribe'].includes(bodyLowerCase)) {
unsubscribe(senderPhoneNumber);
const twiml = new MessagingResponse();
twiml.message(`
You have unsubscribed from the ${appName} texting group. To join again,
text 'my name is <your name>' to this number.
`.replace(/\s+/g, ' '));
res.type('text/xml').send(twiml.toString());
return;
}
const senderSubscription = getSubscriptionFromNumber(senderPhoneNumber);
const otherSubscriptions = getSubscriptions().filter(sub => sub.number !== senderPhoneNumber);
const forwardedMessage = `${senderSubscription.name} said: ${body}`;
sendTextMessage(otherSubscriptions, forwardedMessage);
const abbreviatedBody = body.length > 16 ? `${body.slice(0, 14)}...` : body;
const confirmationMessage = `
Your message was forwarded to ${otherSubscriptions.length}
recipients: "${abbreviatedBody}". Only you can see this message.
`.replace(/\s+/g, ' ');
sendTextMessage([senderSubscription], confirmationMessage);
} else {
if (bodyLowerCase.startsWith('my name is ') || bodyLowerCase.startsWith('my name is: ')) {
const senderName = body.matchAll(/^my name is:? (.*)$/gi)?.next()?.value?.[1];
if (!senderName) {
const twiml = new MessagingResponse();
twiml.message("Please provide a name. Syntax: my name is <your name>");
res.type('text/xml').send(twiml.toString());
return;
}
const subscription = subscribe(senderPhoneNumber, senderName);
const welcomeMessage = `
Well done, ${senderName}! You have successfully subscribed to the
${appName} meet texting group. You will now be able to send and receive
messages to and from the group. Send 'list' to list participants, and
send 'exit' to unsubscribe.
`.replace(/\s+/g, ' ');
sendTextMessage([subscription], welcomeMessage);
} else {
const twiml = new MessagingResponse();
twiml.message(`
You are not subscribed to this texting group. To subscribe, send a
text to this number with this syntax: my name is <your name>
`.replace(/\s+/g, ' '));
res.type('text/xml').send(twiml.toString());
return;
}
}
const twiml = new MessagingResponse();
res.type('text/xml').send(twiml.toString());
});
app.listen(port, () => {
console.log(`Express server listening on port ${port}`);
});
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