CyborgCamp volunteer SMS notifications

cyborgcamp-tropo.php

<?php 
include('include.php');

session_start();

$voice = 'allison';

$jsonInput = file_get_contents("php://input");
$input = json_decode($jsonInput);

$volunteers = array(
  '19995551212' => 'Bob',
  '18886662323' => 'Alice'
);

if(is_object($input))
{
	// Incoming messages have a "session" parameter from Tropo
	if(property_exists($input, 'session') && property_exists($input->session, 'from'))
	{
		$sessionID = $input->session->id;
		$_SESSION['session'] = $input->session;
		$_SESSION['callerID'] = $input->session->from->id;
		$message = $input->session->initialText;
	}
	// A session was already started
	elseif(array_key_exists('session', $_SESSION))
	{
		$sessionID = $_SESSION['session']->id;
	}
	else
		$sessionID = FALSE;
}
else
	$sessionID = FALSE;

	
// If one of the volunteers sends a message, broadcast the message to the rest of the volunteers
if(array_key_exists($_SESSION['callerID'], $volunteers))
{
	$name = $volunteers[$_SESSION['callerID']];
	ircdebug('[cyborgcamp] ' . $name . ': ' . $message);
	
	foreach($volunteers as $k=>$v)
	{
		if($_SESSION['callerID'] != $k)
		{
			$tropo[] = array('message' => array(
				'say' => array('value' => $name . ': ' . $message),
				'to' => $k,
				'network' => 'SMS'
			));
		}
	}
}
else
{		
	// If an unknown user sends an SMS, assume they asked to be let in to the building so reply to them here
	$tropo[] = array(
		'say' => array(
			'value' => "Ok! We'll be right there!"
		)
	);
	
	// Notify all the volunteers of the user's message
	foreach(getForwardingNumbers() as $n)
	{
		$tropo[] = array(
			'message' => array(
				'say' => array('value' => $_SESSION['callerID'] . ' says: ' . $message),
				'to' => $n,
				'network' => 'SMS'
			)
		);
	}
	
	ircdebug('[cyborgcamp] ' . $_SESSION['callerID'] . ' says: ' . $message);
}

echo json_encode(array('tropo'=>$tropo));


function getForwardingNumbers($prefix='')
{
	global $volunteers;
	$a = array();
	foreach($volunteers as $k=>$v)
		$a[] = $prefix . $k;
	return $a;
}

function getForwardingName($number)
{
	global $volunteers;
	return array_key_exists($number, $volunteers) ? $volunteers[$number] : $number;
}

// Send a debug message to a mediawiki recentchanges IRC bot
function ircdebug($msg)
{
	$sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
	socket_sendto($sock, $msg, strlen($msg), 0, 'example.com', 51111);
}

?>