gateway = $gateway;
$this->notify_url = WC()->api_request_url('WC_Esewa_Gateway');
}
// Generate request signature
private function generate_signature($data, $order) {
WC_Esewa_Gateway::log( 'Generating signature for order ' . $order->get_id() );
$input_string = "total_amount={$data['total_amount']},transaction_uuid={$data['transaction_uuid']},product_code={$data['product_code']}";
$secret_key = $this->gateway->merchant_secret;
$secret_key = htmlspecialchars_decode($secret_key);
$signature = hash_hmac('sha256', $input_string, $secret_key, true);
$base64_signature = base64_encode($signature);
return $base64_signature;
}
// Generate arguments for eSewa form
public function get_esewa_args($order) {
WC_Esewa_Gateway::log( 'Generating payment form for order ' . $order->get_id() . '. Notify URL: ' . $this->notify_url );
$args = [
'amount' => sprintf("%.2f", $order->get_subtotal() - $order->get_total_discount()),
'tax_amount' => sprintf("%.2f", $order->get_total_tax(), 2 ),
'total_amount' => sprintf("%.2f", $order->get_total(), 2),
'transaction_uuid' => uniqid().esc_html($this->gateway->get_option( 'invoice_prefix' ).'esewa-retro'.$order->get_id()), // Generating a UUID for transaction ID
'product_code' => $this->gateway->product_code,
'product_service_charge' => sprintf("%.2f", $this->get_service_charge( $order ), 2 ),
'product_delivery_charge' => sprintf("%.2f", $order->get_total_shipping(), 2),
'success_url' => $this->limit_length($this->notify_url, 255),
'failure_url' => esc_url_raw($order->get_cancel_order_url_raw()),
'signed_field_names' => "total_amount,transaction_uuid,product_code",
'signature' => '',
];
// Generate signature after constructing the args array
$args['signature'] = $this->generate_signature( $args, $order );
return $args;
}
protected function limit_length( $string, $limit = 127 ) {
$str_limit = $limit - 3;
if ( function_exists( 'mb_strimwidth' ) ) {
if ( mb_strlen( $string ) > $limit ) {
$string = mb_strimwidth($string, 0, $str_limit) . '...';
}
} else {
if (strlen($string) > $limit) {
$string = substr($string, 0, $str_limit) . '...';
}
}
return $string;
}
protected function get_service_charge( $order ) {
$fee_total = 0;
if ( count( $order->get_fees() ) > 0 ) {
foreach ( $order->get_fees() as $item ) {
$fee_total += ( isset( $item['line_total'] ) ) ? $item['line_total'] : 0;
}
}
return $fee_total;
}
}