catalog/controller/api/shipping.php

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<?php
class ControllerApiShipping extends Controller {
	public function address() {
		$this->load->language('api/shipping');

		// Delete old shipping address, shipping methods and method so not to cause any issues if there is an error
		unset($this->session->data['shipping_address']);
		unset($this->session->data['shipping_methods']);
		unset($this->session->data['shipping_method']);

		$json = array();

		if ($this->cart->hasShipping()) {
			if (!isset($this->session->data['api_id'])) {
				$json['error']['warning'] = $this->language->get('error_permission');
			} else {
				// Add keys for missing post vars
				$keys = array(
					'firstname',
                    'lastname',
					'company',
					'address_1',
					'address_2',
					'postcode',
					'city',
					'zone_id',
					'country_id'
				);

				foreach ($keys as $key) {
					if (!isset($this->request->post[$key])) {
						$this->request->post[$key] = '';
					}
				}

				if ((utf8_strlen(trim($this->request->post['firstname'])) < 1) || (utf8_strlen(trim($this->request->post['firstname'])) > 32)) {
					$json['error']['firstname'] = $this->language->get('error_firstname');
				}

                if (is_ft()) {
                    if ((utf8_strlen(trim($this->request->post['lastname'])) < 1) || (utf8_strlen(trim($this->request->post['lastname'])) > 32)) {
                        $json['error']['lastname'] = $this->language->get('error_lastname');
                    }
                }

				if ((utf8_strlen(trim($this->request->post['address_1'])) < 3) || (utf8_strlen(trim($this->request->post['address_1'])) > 128)) {
					$json['error']['address_1'] = $this->language->get('error_address_1');
				}

				if ((utf8_strlen($this->request->post['city']) < 2) || (utf8_strlen($this->request->post['city']) > 32)) {
					$json['error']['city'] = $this->language->get('error_city');
				}

				$this->load->model('localisation/country');

				$country_info = $this->model_localisation_country->getCountry($this->request->post['country_id']);

				if ($country_info && $country_info['postcode_required'] && (utf8_strlen(trim($this->request->post['postcode'])) < 2 || utf8_strlen(trim($this->request->post['postcode'])) > 10)) {
					$json['error']['postcode'] = $this->language->get('error_postcode');
				}