{

private static $instance;

//Plugin file

public $file;

//Plugin path

public $plugin_path;

//Plugin URL

public $plugin_url;

// plugin version

public $version;

/**

* implement singleton

* for main EDD_Paystack instance

**/

public static function instance() {

if ( !isset( self::$instance ) ) {

self::$instance = new EDD_Paystack(__FILE__);

}

return self::$instance;

}

/**

* Constructor - Setup Gateway default values

* @since 1.0.0

* @return void

**/

private function __construct( $file )

{

$this->version = '1.0.0';

$this->file = $file;

$this->plugin_url = trailingslashit( plugins_url( '', $plugin = $file ) );

$this->plugin_path = trailingslashit( dirname( $file ) );

$this->msg = null; //error notices init

// The Title shown on the top of the Payment Gateways Page next to all the other Payment Gateways

$this->method_title = __( "Paystack.com", 'mm-paystack' );

// The description for this Payment Gateway, shown on the actual Payment options page on the backend

$this->method_description = __( "Securely take payments using local and foreign Mastercard, VISA and Verve cards via Paystack.com", 'mm-paystack' );

/**

* admin hooks

*/

if ( is_admin() ):

//add payment gateway settings to EDD

add_filter( 'edd_settings_gateways', array($this, 'add_gateway_settings') );

endif;

/**

* client hooks

*/

//register gateway

add_filter( 'edd_payment_gateways', array($this, 'register_gateway') );

//enable naira currency on Easy Digital Downloads

add_filter( 'edd_currencies', array($this, 'po_paystack_naira_currency') );

// enable Paystack icon on checkout page

add_filter( 'edd_accepted_payment_icons', array($this, 'po_paystack_payment_icon') );

//credit card form

add_filter( 'edd_paystack_cc_form', array($this, 'po_paystack_cc_form') );

//process payment

add_filter( 'edd_gateway_paystack', array($this, 'process_payment') );

/**

* Plugin warnings & notices

*/

// Check for SSL and send warning if not set

add_action( 'admin_notices', array($this, 'do_ssl_check'));

//append Paystack scripts

add_action( 'wp_enqueue_scripts', array( $this, 'payment_scripts' ) );

} //end __construct()

/**

* payment_scripts function.

*

* Outputs JS & CSS used for Paystack payment

*

* @access public

*/

public function payment_scripts() {

//don't run if page is not checkout page

if (! edd_is_checkout() ) {

return;

}

wp_enqueue_script( 'paystack-inline', 'https://js.paystack.co/v1/inline.js');

wp_enqueue_script( 'edd-paystacker.js', plugins_url( 'assets/edd-paystacker.js', __FILE__ ), array( 'paystack-inline' ), $this->version, true );

wp_enqueue_script( 'jquery.growl.js', plugins_url( 'assets/jquery.growl.js', __FILE__ ), array( 'paystack-inline' ), null, true );

wp_enqueue_style('edd-paystacker.css', plugins_url( 'assets/edd-paystacker.css', __FILE__ ));

wp_enqueue_style('jquery.growl.css', plugins_url( 'assets/jquery.growl.css', __FILE__ ));

}

/**

* add our icon on checkout page

*

* @access public

*

*/

public function po_paystack_payment_icon( $icons ) {

$icons[plugins_url( 'assets/paystack-edd.png', __FILE__ )] = 'Paystack';

return $icons;

} //end po_paystack_payment_icon()

/**

* add Naira to EDD currencies

*

* @access public

*/

public function po_paystack_naira_currency($currencies) {

$currencies['NGN'] = __('Naira (₦)', 'po_paystack');

return $currencies;

} // end naira_currency

/**

* register Paystack to EDD. $gateways object runs during hooks

*

* @access public

*/

public function register_gateway( $gateways ) {

$gateways['paystack'] = array( 'admin_label' => 'Paystack.com Payment Gateway', 'checkout_label' => __('Paystack: Pay via credit/debit cards', 'po_paystack') );

return $gateways;

}

/**

* custom CC form on checkout page

*

* hidden fields retrieve params for Paystack

*

* @access public

*/

public function po_paystack_cc_form() {

global $edd_options;

$txc = $this->genRefCode();

$checked = 1;

$paystack_public = edd_is_test_mode() ? $edd_options['test_public_key'] : $edd_options['live_public_key'];

?>

<input id="txcode" name="txcode" type="hidden" value="<?php echo esc_attr($txc); ?>"/>

<input id="cptd" name="cptd" type="hidden" value="0" />

<div id="new_paystack" <?php if ( $checked === 1 ) : ?>style="display:none;"<?php endif; ?>

data-key="<?php echo esc_attr($paystack_public); ?>"

data-ref="<?php echo esc_attr($txc); ?>"

data-amount="<?php echo (edd_get_cart_total())*100; ?>" <?php //Converted to kobo ?>

>

</div>

<?php

}

/**

* init_form_fields function.

*

* Build the admin / settings fields for Paystack.com Gateway

*

* @access public

*

* TODO

* enable Paystack settings only when currency is NGN

*/

public function add_gateway_settings( $settings ) {

$paystack_settings = array(

array(

'id' => 'paystack_gateway_settings',

'name' => '<h3>' . __('Paystack.com Payment Gateway', 'po_paystack') . '</h3>',

'desc' => '<p>' . __('Paystack.com enables you to securely take payments using local and foreign Mastercard, VISA and Verve cards', 'po_paystack') . '</p>',

'type' => 'header'

),

array(

'id' => 'test_public_key',

'name' => __( 'Paystack.com Public Key', 'po_paystack' ),

'desc' => __( 'This is the Test Public Key provided by Paystack.com when you signed up for an account.', 'po_paystack' ),

'type' => 'text',

),

array(

'id' => 'test_secret_key',

'name' => __( 'Paystack.com Test Secret Key', 'po_paystack' ),

'desc' => __( 'This is the Test Secret Key provided by Paystack.com when you signed up for an account.', 'po_paystack' ),

'type' => 'text',

),

array(

'id' => 'live_public_key',

'name' => __( 'Paystack.com Live Public Key', 'po_paystack' ),

'desc' => __( 'This is the Live Public Key provided by Paystack.com when you activated your account.', 'po_paystack' ),

'type' => 'text',

),

array(

'id' => 'live_secret_key',

'name' => __( 'Paystack.com Live Secret Key', 'po_paystack' ),

'desc' => __( 'This is the Live Secret Key provided by Paystack.com when you activated your account.', 'po_paystack' ),

'type' => 'text',

),

);

return array_merge($settings, $paystack_settings);

}

/**

* process_payment function.

*

* Submit payment and handle response

*

* @access public

*/

public function process_payment( $purchase_data ) {

//edd_options contains the values of the admin settings

global $edd_options;

if (edd_is_test_mode()) {

$paystack_public = $edd_options['test_public_key'];

$paystack_secret = $edd_options['test_secret_key'];

} else {

$paystack_public = $edd_options['live_public_key'];

$paystack_secret = $edd_options['live_secret_key'];

}

//txcode POSTed from payment form

$txcode = (isset( $_POST['txcode'] ) ) ? $_POST['txcode'] : null;

/**

* check for checkout fields errors

*

*/

// check if there is a gateway name

if ( !isset( $purchase_data['post_data']['edd-gateway'] ) ):

return;

endif;

// get EDD errors

$errors = edd_get_errors();

// Paystack errors

$paystack_error = null;

/**

* end checkout fields error checks

*/

// if no errors

if ( !$errors ):

// record purchase summary

$summary = edd_get_purchase_summary( $purchase_data, false );

// cart quantity

$quantity = edd_get_cart_quantity();

/**

* setup the payment data

*/

$payment_data = array(

'price' => $purchase_data['price'],

'date' => $purchase_data['date'],

'user_email' => $purchase_data['user_email'],

'purchase_key' => $purchase_data['purchase_key'],

'currency' => $edd_options['currency'],

'downloads' => $purchase_data['downloads'],

'cart_details' => $purchase_data['cart_details'],

'user_info' => $purchase_data['user_info'],

'status' => 'pending'

);

// record the pending payment

$payment = edd_insert_payment($payment_data);

$order_id = $payment;

if ( !$payment ):

// Record the error

edd_record_gateway_error( __( 'Payment Error', 'po_paystack' ), sprintf( __( 'Payment creation failed before loading Paystack. Payment data: %s', 'po_paystack' ), json_encode( $payment_data ) ), $payment );

// Problems? send back

edd_send_back_to_checkout( '?payment-mode=' . $purchase_data['post_data']['edd-gateway'] );

else:

if ( !$order_id || !$paystack_public ):

edd_record_gateway_error( __( 'Invalid transaction', 'po_paystack' ), sprintf( __( 'Invalid transaction; possible hack attempt. Payment data: %s', 'po_paystack' ), json_encode( $payment_data ) ), $payment );

edd_send_back_to_checkout( '?payment-mode=' . $purchase_data['post_data']['edd-gateway'] );

endif;

if ( !$txcode ):

$error = "Error! An invalid transaction code was reported.";

edd_update_payment_status($order_id, 'failed');

throw new Exception( __($error));

else:

$amount = ($payment_data['price'])*100; //convert to kobo

if (intval($amount) < 100):

$error = "Invalid transaction. Paystack cannot process orders under 100 kobo in value. Transaction code: ".$txcode;

edd_update_payment_status($order_id, 'failed');

throw new Exception( __($error));

endif;

$email = strtolower($payment_data['user_email']);

require_once dirname(__FILE__) . '/paystack-class/Paystack.php';

// Create the library object

$paystack = new Paystack( $paystack_secret );

list($headers, $body, $code) = $paystack->transaction->verify([

'reference'=> $txcode

]);

$resp = $body;

if (array_key_exists("status", $resp) && !$resp["status"]):

$error = "Failed with message from Paystack: " . $resp["message"];

edd_insert_payment_note( $order_id, __($error) );

edd_update_payment_status( $order_id, 'failed' );

throw new Exception( __($error));

elseif (strtolower($resp["data"]["customer"]["email"])!==$email):

$error = "Invalid customer email associated with Transaction code:".$txcode." and Paystack reference: ".$resp["data"]['reference'].". Possible hack attempt.";

edd_insert_payment_note( $order_id, __($error) );

edd_update_payment_status( $order_id, 'failed' );

throw new Exception( __($error));

else:

// Authcode and Authdesc. To be used in future version, for recurrent billing

$authcode = $resp["data"]["authorization"]["authorization_code"];

$authdesc = $resp["data"]["authorization"]["description"];

$paystackref = $resp["data"]["reference"];

// Complete the order. once a transaction is successful, set the purchase status to complete

edd_update_payment_status( $payment, 'complete' );

// record transaction ID, or any other notes you need

edd_insert_payment_note( $payment, "Paystack.com payment completed (using ".strtoupper($authdesc)." and Transaction code:".$txcode.") with Paystack reference:".$paystackref );

// go to the success page

edd_send_to_success_page();

endif;

endif;

endif;

else: // errors present

$fail = true;

endif;

if ( $fail !== false ):

// if errors are present, send the user back to the purchase page so they can be corrected

edd_send_back_to_checkout( '?payment-mode=' . $purchase_data['post_data']['edd-gateway'] );

endif;

}

/**

* do_ssl_check function.

*

* Check if we are forcing SSL on checkout pages. Advised but not required by gateway.

*

* @access public

*/

public function do_ssl_check() {

// Check for SSL

if( edd_is_ssl_enforced() ) {

echo "<div class='error'><p>". sprintf( __( "<strong>%s</strong> payment gateway is enabled but Easy Digital Downloads is not forcing the SSL certificate on your checkout page.<br />For your security, please ensure that you have a valid SSL certificate and that you are forcing Checkout pages to be secured <a href=\"%s\">(check the box 'Force secure checkout').</a>" ), $this->method_title, admin_url( 'admin.php?page=edd-settings&tab=misc&section=checkout' ) ) ."</p></div>";

return false;

}

return true;

}

/**

* is_valid_currency function

*

* Checks if the currency is valid (Nigerian Naira only), as required by gateway. Returns boolean.

*

* @access private

*/

private function is_valid_currency(){

if( edd_get_currency() !== 'NGN' ){

$this->msg = 'Sorry, Paystack.com doesn\'t support your store currency, set it to Nigerian Naira (&#8358;) <a href="' . get_bloginfo('wpurl') . '/wp-admin/admin.php?page=edd-settings&tab=general&section=currency">here</a>';

return false;

}

return true;

}

/**

* genRefcode function.

*

* Generates reference code for Paystack payment. Returns transaction reference code.

*

* @access private

*/

private function genRefcode(){

$len = 24;

$string = "";

$characters = "0123456789ABCDEFGHJKLMNPQRTUVWXYZ";

for ($i = 0; $i < $len; $i++):

$string .= $characters[mt_rand(0, strlen($characters)-1)];

endfor;

$uid = preg_replace("/[^A-Z0-9 ]/", '', base64_encode(pack('H*', md5($string . uniqid("", true)))));

while (strlen($uid) < $len)

$uid = $uid . uniqid("", true);

return str_shuffle(trim(substr(str_replace(array('I','L','S','O','1','5','0'), '', preg_replace("/[^A-Z0-9 ]/", '', $uid)), 0, $len)));

}

// check if Easy Digital Downloads is activated, if not alert user

if (! class_exists('Easy_Digital_Downloads') ) {

add_action( 'admin_notices', 'po_paystack_missing_edd' );

} else {

edd_paystack(); // load plugin class

}