catalog/controller/api/payment.php

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

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

		$json = array();

		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');
			}