<?php

/* Listen for any HTTP GET requests -> Incoming SMSes,

do the appropriate request response and log the notifications to a text file

URL Format: http://www.spark-sms.com/letterbox.php?who=%sender%&what=%text%

*/

if(isset($_GET['who'])){

$sender = $_GET['who'];

$msg = $_GET['what'];

//we prep the file for writing and logging information

$myfile = fopen("letterbox_log.txt", "a") or die("Unable to open file!");

fwrite($myfile, 'Sender: '.$sender."\n");

fwrite($myfile, 'Text: '.$msg."\n");

fwrite($myfile, "\n\n\n");

fclose($myfile);

//send back a HTTP response

deliverResponse(true);

/* we parse each incoming msg to match against the list of keywords

so as to assign each msg to the appropriate user */

// include the configs / constants for the API connection

require_once("config/api.php");

//include the classes for recording outbound messages to database

require_once("classes/connection.php");

//include format checking function and notification module

require_once("classes/formatting.php");

//pull in the list of existing keywords from keywords table

$mysqli = openConnection();

$keyword_array = getAllKeywordArray($mysqli);

//we set the default assignment of msgs to admin account

$assoc_user = "kw244";

//we match the inbound msg to the appropriate user by keyword

foreach($keyword_array as $keyword => $user_name){

//we check for each $keyword if the $msg contains it

if(containsKeyword($msg, $keyword)){

$assoc_user = $user_name;

//we send the autoreply if it is not null

$autoreply = getAutoReply($mysqli, $keyword);

if(!is_null($autoreply['text'])){

//we setup the necessary fields for the API call

$api_fields = array( //recipients to be handled below according to input source

'from' => '6590249973',

'to' => array($sender),

'text' => $autoreply['text']

);

$api_result = APISendSMS($api_fields);

$json_result = json_decode($api_result, true);

//we log the SMS as an outbound message in the database

$outbound_data = array(

//a bulkId is generated regardless of # recipients as long as a recipients_array is submitted

'api_ref_id'=>$json_result['bulkId'],

'title'=>'Auto-Reply ['.$keyword.']',

'from'=>'6590249973',

'to'=>implode(', ',$api_fields['to']) , //Convert recipients array

'text'=>$autoreply['text'],

'status'=>$json_result['messages'][0]['status']['groupName'], //TODO might need to

'credits_used'=> $autoreply['num_msg']

);

//enter details of outbound msg into outbound table and deduct appropriate user credits

uploadOutboundInfo($mysqli,$outbound_data);

subtractUserCredits($mysqli,$outbound_data['credits_used']);

}

break;

}

}

//we upload the inbound msg

uploadInboundInfo($mysqli, $sender, $msg, $assoc_user);

// close connection

closeConnection($mysqli);

}

else {

deliverResponse(false);

}

//We provide 2 possible responses for any requests to this callback URL

//no body is returned

function deliverResponse($status_ok){

}

?>