Demonstrates how to handle an incoming sms POSTed by Twilio.

handle-incoming-twilio-sms.js

/**
 * Handle incoming sms commands
 *
 * Verifies that the requestor is authorized - then determines the request type (start / stop attacking)
 *
 * Finally starts or stops an attack as appropriate
 * 
 * @param  {Request} Twilio POST request - generated when a user sends an sms to the associated Twilio number
 * @param  {Response} Express response
 *  
 */
app.post('/incoming-sms', function(req, res){
	//Get the requestor's phone number from the Twilio POST object	
	var requestor = req.body.From; 

	//If target is currently under attack and is not an admin - and they text this number - give them a particular text response
	if (isTargetBeingAttacked(requestor) && !isAuthorizedUser(requestor)){

		sendResponseSMS(requestor, 'Command not recognized. We will upgrade your CatFacts account to send you facts more frequently. Thanks for choosing CatFacts!');

	} else if (!isAuthorizedUser(requestor)){
		//Do nothing and do not respond if requestor is unauthorized
		return;
		
	} else {

		//Get body content of sms sent by requestor
		var payload = req.body.Body; 

		//Check if this is a stop attack request - returns target number if it is
		var check = isStopRequest(payload); 

		if(check){
			//isStopRequest returns the target phone number for valid stop requests
			var target = check; 
			//Stop the attack on the supplied number
			handleAdminStopRequest(requestor, target); 

		} else {
			//Start an attack on the supplied number
			handleAdminAttackRequest(requestor, payload); 
		}	

		//Give Twilio a successful response for logging purposes
		res.status(200).send('Finished processing POST request to /incoming-sms');
	}
});