<?php
/*
Addon Name: PesaPal Single Payments Gateway
Author: David Gikandi
Author URI: http://chamabox.co.ke
Gateway ID: pesapal
*/

class pesapal extends Membership_Gateway {

var $gateway = 'pesapal' ;
var $title = 'PesaPal with Single Payments' ;
var $issingle = true ;

public function __construct() {
parent::__construct();

add_action( 'M_gateways_settings_' . $this->gateway, array( &$this, 'mysettings' ) );

// If I want to override the transactions output - then I can use this action
//add_action('M_gateways_transactions_' . $this->gateway, array(&$this, 'mytransactions'));

if ( $this->is_active() ) {
// Subscription form gateway
add_action( 'membership_purchase_button', array( &$this, 'display_subscribe_button' ), 1, 3 );

// Payment return
add_action( 'membership_handle_payment_return_' . $this->gateway, array( &$this, 'handle_pesapal_return' ) );
add_filter( 'membership_subscription_form_subscription_process', array( &$this, 'signup_free_subscription' ), 10, 2 );
}
}

function mysettings() {
//
}

function single_sub_button($pricing, $subscription, $user_id, $norepeat = false) {

global $M_options;
$form = "
<img src='http://chamabox.co.ke/JoinNow.gif' alt='Subscribe' title='Subscribe' style='width:128px' />
";

return $form;
}

function build_subscribe_button($subscription, $pricing, $user_id, $sublevel) {

if(!empty($pricing)) {

// check to make sure there is a price in the subscription
// we don't want to display free ones for a payment system
$free = true;
foreach($pricing as $key => $price) {
if(!empty($price['amount']) && $price['amount'] > 0 ) {
$free = false;
}
}

if(!$free) {
if(count($pricing) == 1) {
// A basic price or a single subscription
if(in_array($pricing[0]['type'], array('indefinite','finite'))) {
// one-off payment
return $this->single_sub_button($pricing, $subscription, $user_id, false);
} else {
// simple subscription
return $this->single_sub_button($pricing, $subscription, $user_id, true);
}
} else {
// something much more complex
// Complex buttons currently not supported by PesaPal
//return $this->complex_sub_button($pricing, $subscription, $user_id);

}
}

}

}

function display_subscribe_button($subscription, $pricing, $user_id, $sublevel = 1) {

if(isset($pricing[$sublevel - 1]) && $pricing[$sublevel - 1]['amount'] < 1)
echo $this->single_free_button($pricing, $subscription, $user_id, $sublevel);
else
echo $this->build_subscribe_button($subscription, $pricing, $user_id, $sublevel);

}

function build_custom( $user_id, $sub_id, $amount, $sublevel = 0, $fromsub = 0 ) {
global $M_options;

$custom = time() . ':' . $user_id . ':' . $sub_id . ':';
$key = md5('MEMBERSHIP' . $amount);

if ( $fromsub === false ) {
$fromsub = filter_input( INPUT_GET, 'from_subscription', FILTER_VALIDATE_INT );
}

$custom .= $key;
$custom .= ":" . $sublevel . ":" . $fromsub;

return $custom;
}

function update() {
// default action is to return true
return true;
}

}

Membership_Gateway::register_gateway( 'pesapal', 'pesapal' );


// Step 1: Package the request to post to PesaPal and sign it
// Include OAuth

include_once ( 'OAuth.php' ) ;

//Assign Variables

$token = $params = NULL ;
$consumer_key = 'XXXXXXXXXXXX' ;
$consumer_secret = 'XXXXXXXXXXXX' ;
$signature_method = new OAuthSignatureMethod_HMAC_SHA1( ) ;
$iframelink = 'https://www.pesapal.com/API/PostPesapalDirectOrderV4' ;

// Step 2: Post the request to PesaPal and load the PesaPal payments page
// Assign Form Details passed to pesapal?iframe.php from shopping?cart?form.php to the specified variables.
//get form details

$amount = $_POST['amount'];
$amount = number_format( $amount, 2 ) ;

//format amount to 2 decimal places

$desc = $_POST['description'];
$type = $_POST['type']; //default value = MERCHANT
$reference = $_POST['reference'];

//unique order id of the transaction, generated by merchant

$first_name = $_POST['first_name']; //[optional]
$last_name = $_POST['last_name']; //[optional]
$email = $_POST['email'];

// Construct the post_xml variable. The format is standard so no editing is required. Encode the variable using htmlentities.

$callback_url = 'http://chamabox.co.ke/callback_redirect.php' ; //redirect url, the page that will handle the
response from pesapal.
$post_xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><PesapalDirectOrderInfo xmlns:xsi=\"http://www.w3.org/2001/XMLSchemainstance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" Amount=\"" . $amount . "\" Description=\"" . $desc . "\" Type=\"" . $type . "\" Reference=\"" . $reference . "\" FirstName=\"" . $first_name . "\" LastName=\"" . $last_name . "\" Email=\"" . $email . "\" PhoneNumber=\"" . $phonenumber . "\" xmlns=\"http://www.pesapal.com\" />" ;
$post_xml = htmlentities( $post_xml ) ;

// Construct the OAuth Request url. Using the Oauth class included construct the oauth request url using the parameters declared above (the format is standard so no editing is required)

$consumer = new OAuthConsumer( $consumer_key, $consumer_secret ) ;

//post transaction to pesapal

$iframe_src = OAuthRequest :: from_consumer_and_token( $consumer, $token, "GET", $iframelink, $params ) ;
$iframe_src->set_parameter( "oauth_callback", $callback_url ) ;
$iframe_src->set_parameter( "pesapal_request_data", $post_xml ) ;
$iframe_src->sign_request( $signature_method, $consumer, $token ) ;

// Step 3: Display a post-payment page to your customer
//display pesapal - iframe and pass iframe_src

< iframe src = "<?php echo $iframe_src;?>" width = "100%" height = "700px" scrolling = "no" frameBorder = "0" > < p > Browser unable to load iFrame < / p > < / iframe >

// Step 4: Query PesaPal for payment status

?>