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incoming.js
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incoming.js
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const { MessagingResponse } = require('twilio').twiml;
const moment = require('moment');
const countriesList = require("countries-list")
const phoneUtil = require('google-libphonenumber').PhoneNumberUtil.getInstance();
const { determineCoffeeFromMessage } = require('../../data/coffee-options');
const { config } = require('../../data/config');
const {
getWrongOrderMessage,
getExistingOrderMessage,
getOrderCreatedMessage,
getHelpMessage,
getMaxOrdersMessage,
getNoOpenOrderMessage,
getQueuePositionMessage,
getCancelOrderMessage,
getSystemOfflineMessage,
getEventRegistrationMessage,
getNoActiveEventsMessage,
} = require('../../utils/messages');
const {
customersMap,
orderQueueList,
allOrdersList,
sendMessage,
} = require('../twilio');
const {
INTENTS,
} = require('../../../shared/consts');
const { safe } = require('../../utils/async-requests.js');
function createOrderItem(customer, coffeeOrder, originalMessage) {
return {
data: {
product: coffeeOrder,
message: originalMessage,
source: customer.data.source,
status: 'open',
customer: customer.key,
},
};
}
async function findOrCreateCustomer({ Author, Source, ConversationSid, MessagingServiceSid }) {
let customerEntry;
try {
customerEntry = await customersMap.syncMapItems(ConversationSid).fetch();
} catch (err) {
const number = phoneUtil.parseAndKeepRawInput(Author.replace("whatsapp:", ""));
const country = Object.values(countriesList.countries).find(country => country.phone === `${number.getCountryCode()}`)
customerEntry = await customersMap.syncMapItems.create({
key: ConversationSid,
data: {
openOrders: [],
completedOrders: 0,
contact: MessagingServiceSid,
countryCode: country.name || 'unknown',
source: Source,
eventId: null,
},
});
}
return customerEntry;
}
async function setEventForCustomer(customerEntry, eventId) {
const eventExpiryDate = moment()
.add(5, 'days')
.valueOf();
const data = Object.assign({}, customerEntry.data, {
eventId,
eventExpiryDate,
});
return customerEntry.update({ data });
}
async function removeEventForCustomer(customerEntry) {
const data = Object.assign({}, customerEntry.data);
data.eventId = undefined;
data.eventExpiryDate = undefined;
return customerEntry.update({ data });
}
function determineIntent(message, forEvent) {
const msgNormalized = message.toLowerCase().trim();
if (msgNormalized.startsWith('_register:')) {
const eventId = msgNormalized.replace('_register:', '').trim();
return {
intent: INTENTS.REGISTER,
value: eventId,
};
}
if (msgNormalized.startsWith('_unregister')) {
return {
intent: INTENTS.UNREGISTER,
};
}
if (msgNormalized.startsWith('_eventinfo')) {
return {
intent: INTENTS.GET_EVENT,
};
}
if (msgNormalized.indexOf('help') !== -1) {
return {
intent: INTENTS.HELP,
};
}
if (msgNormalized.indexOf('send this message to order') !== -1) {
return {
intent: INTENTS.WELCOME,
};
}
if (msgNormalized.indexOf('queue') !== -1) {
return {
intent: INTENTS.QUEUE,
};
}
if (msgNormalized.indexOf('cancel') !== -1) {
return {
intent: INTENTS.CANCEL,
};
}
const coffeeOrder = determineCoffeeFromMessage(message, forEvent);
if (!coffeeOrder) {
return {
intent: INTENTS.INVALID,
};
}
return {
intent: INTENTS.ORDER,
value: coffeeOrder,
};
}
async function getQueuePosition(customer) {
const key = customer.identity;
let customerEntry;
try {
customerEntry = await customersMap.syncMapItems(key).fetch();
} catch (err) {
return NaN;
}
const orderNumber = customerEntry.data.openOrders[0];
if (!orderNumber) {
return NaN;
}
const items = await orderQueueList(customer.eventId).syncListItems.list({
pageSize: 100,
});
const queuePosition = items.findIndex(item => item.index === orderNumber);
return queuePosition >= 0 ? queuePosition : NaN;
}
async function cancelOrder(customer) {
const key = customer.key;
let customerEntry;
try {
customerEntry = await customersMap.syncMapItems(key).fetch();
} catch (err) {
return false;
}
const orderNumber = customerEntry.data.openOrders[0];
if (orderNumber === undefined) {
return false;
}
const orderedItemLink = orderQueueList(customer.data.eventId)
.syncListItems(orderNumber);
const orderedItem = await orderedItemLink.fetch()
await orderedItemLink.remove();
customerEntry.data.openOrders = [];
await customersMap.syncMapItems(key).update({
data: customerEntry.data,
});
return {
product: orderedItem.data.product,
orderNumber: orderNumber
};
}
/**
* This is the request handler for incoming SMS and WhatsApp messages by handling webhook request from Twilio.
*
* @param {any} req
* @param {any} res
* @returns
*/
async function handleIncomingMessages(req, res) {
let customerEntry = await findOrCreateCustomer(req.body);
if (
!customerEntry.data.eventId ||
customerEntry.data.eventExpiryDate < Date.now()
) {
const { events } = config();
const choices = Object.values(events)
.filter(x => {
return x.isVisible;
})
.map(x => x.eventName)
.map((name, idx) => `${idx + 1}: ${name}`);
const choiceToEventId = Object.keys(events).filter(
x => events[x].isVisible
);
if (isNaN(+req.body.Body)) {
if (choiceToEventId.length === 0) {
await sendMessage(customerEntry.key, getNoActiveEventsMessage());
return;
} else if (choiceToEventId.length > 1) {
const message = getEventRegistrationMessage(choices);
await sendMessage(customerEntry.key, message);
return;
}
const autoChosenEventId = choiceToEventId[0];
customerEntry = await setEventForCustomer(
customerEntry,
autoChosenEventId
);
} else {
res.type('text/plain');
const choice = parseInt(req.body.Body.trim(), 10);
const chosenEventId = choiceToEventId[choice - 1];
if (!chosenEventId) {
return await sendMessage(customerEntry.key, { body: '🤷♀️ You chose an invalid number for the event. 🤷♂️ Please try again.' });
}
customerEntry = await setEventForCustomer(customerEntry, chosenEventId);
return await sendMessage(customerEntry.key, { body: 'The event has been set 🙂. What would you like to order?' });
}
}
const { eventId } = customerEntry.data;
const messageIntent = determineIntent(req.body.Body, eventId);
if (messageIntent.intent === INTENTS.REGISTER) {
customerEntry = await setEventForCustomer(
customerEntry,
messageIntent.value
);
await sendMessage(customerEntry.key, { body: `Registered for ${messageIntent.value}` });
return;
} else if (messageIntent.intent === INTENTS.UNREGISTER) {
customerEntry = await removeEventForCustomer(customerEntry);
await sendMessage(customerEntry.key, { body: `Unregistered from all events` });
return;
} else if (messageIntent.intent === INTENTS.GET_EVENT) {
await sendMessage(customerEntry.key, { body: `You are registered for: ${eventId}` });
return;
}
if (!config(eventId).isOn) {
await sendMessage(customerEntry.key, getSystemOfflineMessage(eventId));
return;
}
// Respond to HTTP request with empty Response object since we will use the REST API to respond to messages.
const twiml = new MessagingResponse();
res.type('text/xml').send(twiml.toString());
if (messageIntent.intent !== INTENTS.ORDER) {
const { fullMenu, availableMenu } = config(eventId);
const filteredMenu = fullMenu.filter(item => availableMenu[item.shortTitle]);
try {
let responseMessage;
if (messageIntent.intent === INTENTS.HELP || messageIntent.intent === INTENTS.WELCOME) {
responseMessage = getHelpMessage(eventId, filteredMenu);
} else if (messageIntent.intent === INTENTS.QUEUE) {
const queuePosition = await getQueuePosition(customerEntry);
if (Number.isNaN(queuePosition)) {
responseMessage = getNoOpenOrderMessage();
} else {
responseMessage = getQueuePositionMessage(queuePosition);
}
} else if (messageIntent.intent === INTENTS.CANCEL) {
const cancelled = await cancelOrder(customerEntry);
if (cancelled) {
responseMessage = getCancelOrderMessage(cancelled.product, cancelled.orderNumber);
} else {
responseMessage = getNoOpenOrderMessage();
}
} else {
responseMessage = getWrongOrderMessage(req.body.Body, filteredMenu);
}
await sendMessage(customerEntry.key, responseMessage);
res.send();
return;
} catch (err) {
req.log.error(err);
res.status(500).send();
return;
}
}
const coffeeOrder = messageIntent.value;
const { openOrders, completedOrders } = customerEntry.data;
if (completedOrders >= config(eventId).maxOrdersPerCustomer) {
try {
await sendMessage(customerEntry.key, getMaxOrdersMessage());
return;
} catch (err) {
req.log.error(err);
return;
}
}
if (Array.isArray(openOrders) && openOrders.length > 0) {
try {
const order = await orderQueueList(eventId)
.syncListItems(openOrders[0])
.fetch();
await sendMessage(customerEntry.key, getExistingOrderMessage(
order.data.product,
order.index
));
return;
} catch (err) {
req.log.error(err);
return;
}
}
try {
const orderEntry = await orderQueueList(eventId).syncListItems.create(
createOrderItem(customerEntry, coffeeOrder, req.body.Body)
);
customerEntry.data.openOrders.push(orderEntry.index);
await customersMap.syncMapItems(customerEntry.key).update({
data: customerEntry.data,
});
await allOrdersList(eventId).syncListItems.create({
data: {
product: coffeeOrder,
message: req.body.Body,
source: customerEntry.data.source,
countryCode: customerEntry.data.countryCode,
},
});
await sendMessage(customerEntry.key, getOrderCreatedMessage(coffeeOrder, orderEntry.index, eventId));
res.send();
} catch (err) {
req.log.error(err);
res.status(500).send();
}
}
module.exports = {
handler: safe(handleIncomingMessages),
};