<?php

////////////////////////////////////////////////////////////////////
// Class:   TM4B SMS Api
// Usage:
// <code>
// require_once("sms_tm4b.php");
// $sms = new sms( "user", "pass" );
// $sms->send("123456789","sender","message");
// </code>
//
// Package: sms_tm4b
// Created by:  Avasiloaei Dorin
// Modified by: Larry Lart
////////////////////////////////////////////////////////////////////
class sms
{
       // init vars
    var $username = "";
    var $password = "";

    function __construct($strUser, $strPass)
    {
        $this->username = $strUser;
        $this->password = $strPass;
    }

    /**
     * Send sms method
     * @access public
     * @return string response
     */

    function send($phoneNo, $sender, $message)
    {
        /* Prepare the server request */
        $request = "";
        $request .= "username=" . urlencode($this->username);
        $request .= "&password=" . urlencode($this->password);
        $request .= "&revision=2.0";
        $request .= "&type=broadcast";
        $request .= "&msg=" . urlencode($message);
        $request .= "&to=" . urlencode($phoneNo);

            // larry :: default if not defined - TODO  replace
        if (!$sender) {
              $request .= "&from=BosmanGGZ";
        } else {
            $request .= "&from=" . urlencode($sender);
        }

        $request .= "&route=GD02";

        /**
         * Send the request to the server
         * @TODO make sure the request was sent
         */

        $response = $this->_send($request);
        // larry :: debug
        echo "DEBUG :SMS ENGINE: sms sent with code =" . text($response) . " for req= " . text($request) . "\n";

        /**
         * Return the server response
         * @TODO parse the server response
         */

        return $response;
    }

    /**
     * Send sms method
     * @access private
     * @return string response
     */
    function _send($request)
    {
        if (extension_loaded('curl')) {
            /**
             * cURL extension is installed
             * call the method that sends the sms through cURL
             */

            $response = $this->_send_curl($request);
        } elseif (!extension_loaded('sockets')) {
            /**
             * Sockets extension is installed
             * call the method that sends the sms through sockets
             */

             $response = $this->_send_sock($request);
        } else {
            /**
             * The required extensions are not installed
             * call the method that sends the sms using file_get_contents
             */

             $response = file_get_contents("https://www.tm4b.com/client/api/http.php?" . $request);
        }

        /* Return the server response */
         return $response;
    }

    /**
     * Send SMS through cURL
     * @access private
     * @return string response
     */

    function _send_curl($request)
    {
        /* Initiate a cURL session */
        $ch = curl_init();

        /* Set cURL variables */
        curl_setopt($ch, CURLOPT_URL, "https://www.tm4b.com/client/api/http.php");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

        /* Send the request through cURL */
        $response = curl_exec($ch);

        /* End the cURL session */
        curl_close($ch);

        /* Return the server response */
        return $response;
    }

    /**
     * Send SMS using the sockets extension
     * @access private
     * @return string response
     */
    function _send_sock($request)
    {
        /* Prepare the HTTP headers */
        $http_header = "POST /client/api/http.php HTTP/1.1\r\n";
        $http_header .= "Host: tm4b.com\r\n";
        $http_header .= "User-Agent: HTTP/1.1\r\n";
        $http_header .= "Content-Type: application/x-www-form-urlencoded\r\n";
        $http_header .= "Content-Length: " . strlen($request) . "\r\n";
        $http_header .= "Connection: close\r\n\r\n";
        $http_header .= $request . "\r\n";

        /* Set the host that we are connecting to and the port number */
        $host = "ssl://tm4b.com";
        $port = 443;

        /* Connect to the TM4B server */
        $out = @fsockopen($host, $port, $errno, $errstr);

        /* Make sure that the connection succeded */
        if ($out) {
            /* Send the request */
            fputs($out, $http_header);

            /* Get the response */
            while (!feof($out)) {
                $result[] = fgets($out);
            }

            /* Terminate the connection */
            fclose($out);
        }

        /* Get the response from the returned string */
        $response = $result[9];
    }
}