catalog/controller/api/order.php

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<?php
class ControllerApiOrder extends Controller {
	public function add() {
		$this->load->language('api/order');

		$json = array();

		if (!isset($this->session->data['api_id'])) {
			$json['error'] = $this->language->get('error_permission');
		} else {
			// Customer
			if (!isset($this->session->data['customer'])) {
				$json['error'] = $this->language->get('error_customer');
			}

			// Payment Address
			if (!isset($this->session->data['payment_address'])) {
				$json['error'] = $this->language->get('error_payment_address');
			}

			// Payment Method
			if (!$json && !empty($this->request->post['payment_method'])) {
				if (empty($this->session->data['payment_methods'])) {
					$json['error'] = $this->language->get('error_no_payment');
				} elseif (!isset($this->session->data['payment_methods'][$this->request->post['payment_method']])) {
					$json['error'] = $this->language->get('error_payment_method');
				}

				if (!$json) {
					$this->session->data['payment_method'] = $this->session->data['payment_methods'][$this->request->post['payment_method']];
				}
			}

			if (!isset($this->session->data['payment_method'])) {
				$json['error'] = $this->language->get('error_payment_method');
			}

			// Shipping
			if ($this->cart->hasShipping()) {
				// Shipping Address
				if (!isset($this->session->data['shipping_address'])) {
					$json['error'] = $this->language->get('error_shipping_address');
				}

				// Shipping Method
				if (!$json && !empty($this->request->post['shipping_method'])) {
					if (empty($this->session->data['shipping_methods'])) {
						$json['error'] = $this->language->get('error_no_shipping');
					} else {
						$shipping = explode('.', $this->request->post['shipping_method']);

						if (!isset($shipping[0]) || !isset($shipping[1]) || !isset($this->session->data['shipping_methods'][$shipping[0]]['quote'][$shipping[1]])) {
							$json['error'] = $this->language->get('error_shipping_method');
						}
					}

					if (!$json) {
						$this->session->data['shipping_method'] = $this->session->data['shipping_methods'][$shipping[0]]['quote'][$shipping[1]];
					}
				}