OpenCart 🇺🇦

$this->language->load('checkout/checkout');

$this->load->model('account/customer');

$json = array();

// Validate if customer is already logged out.
if ($this->customer->isLogged()) {
	$json['redirect'] = $this->url->link('checkout/checkout', '', 'SSL');			
}

// Validate cart has products and has stock.
if ((!$this->cart->hasProducts() && empty($this->session->data['vouchers'])) || (!$this->cart->hasStock() && !$this->config->get('config_stock_checkout'))) {
	$json['redirect'] = $this->url->link('checkout/cart');
}

// Validate minimum quantity requirments.			
$products = $this->cart->getProducts();

foreach ($products as $product) {
	$product_total = 0;

	foreach ($products as $product_2) {
		if ($product_2['product_id'] == $product['product_id']) {
			$product_total += $product_2['quantity'];
		}
	}		

	if ($product['minimum'] > $product_total) {
		$json['redirect'] = $this->url->link('checkout/cart');

		break;
	}				
}

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

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

	if ((utf8_strlen($this->request->post['email']) > 96) || !preg_match('/^[^\@]+@.*\.[a-z]{2,6}$/i', $this->request->post['email'])) {
		$json['error']['email'] = $this->language->get('error_email');
	}

	if ($this->model_account_customer->getTotalCustomersByEmail($this->request->post['email'])) {
		$json['error']['warning'] = $this->language->get('error_exists');
	}

	if ((utf8_strlen($this->request->post['telephone']) < 3) || (utf8_strlen($this->request->post['telephone']) > 32)) {
		$json['error']['telephone'] = $this->language->get('error_telephone');
	}

	// Customer Group
	$this->load->model('account/customer_group');

	if (isset($this->request->post['customer_group_id']) && is_array($this->config->get('config_customer_group_display')) && in_array($this->request->post['customer_group_id'], $this->config->get('config_customer_group_display'))) {
		$customer_group_id = $this->request->post['customer_group_id'];
	} else {
		$customer_group_id = $this->config->get('config_customer_group_id');
	}

	$customer_group = $this->model_account_customer_group->getCustomerGroup($customer_group_id);

	if ($customer_group) {	
		// Company ID
		if ($customer_group['company_id_display'] && $customer_group['company_id_required'] && empty($this->request->post['company_id'])) {
			$json['error']['company_id'] = $this->language->get('error_company_id');
		}

		// Tax ID
		if ($customer_group['tax_id_display'] && $customer_group['tax_id_required'] && empty($this->request->post['tax_id'])) {
			$json['error']['tax_id'] = $this->language->get('error_tax_id');
		}						
	}

	if ((utf8_strlen($this->request->post['address_1']) < 3) || (utf8_strlen($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']) > 128)) {
		$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 ($country_info) {
		if ($country_info['postcode_required'] && (utf8_strlen($this->request->post['postcode']) < 2) || (utf8_strlen($this->request->post['postcode']) > 10)) {
			$json['error']['postcode'] = $this->language->get('error_postcode');
		}

		// VAT Validation
		$this->load->helper('vat');

		if ($this->config->get('config_vat') && $this->request->post['tax_id'] && (vat_validation($country_info['iso_code_2'], $this->request->post['tax_id']) == 'invalid')) {
			$json['error']['tax_id'] = $this->language->get('error_vat');
		}				
	}

	if ($this->request->post['country_id'] == '') {
		$json['error']['country'] = $this->language->get('error_country');
	}

	if (!isset($this->request->post['zone_id']) || $this->request->post['zone_id'] == '') {
		$json['error']['zone'] = $this->language->get('error_zone');
	}

	if ((utf8_strlen($this->request->post['password']) < 4) || (utf8_strlen($this->request->post['password']) > 20)) {
		$json['error']['password'] = $this->language->get('error_password');
	}

	if ($this->request->post['confirm'] != $this->request->post['password']) {
		$json['error']['confirm'] = $this->language->get('error_confirm');
	}

	if ($this->config->get('config_account_id')) {
		$this->load->model('catalog/information');

		$information_info = $this->model_catalog_information->getInformation($this->config->get('config_account_id'));

		if ($information_info && !isset($this->request->post['agree'])) {
			$json['error']['warning'] = sprintf($this->language->get('error_agree'), $information_info['title']);
		}
	}
}

if (!$json) {
	$this->model_account_customer->addCustomer($this->request->post);

	$this->session->data['account'] = 'register';

	if ($customer_group && !$customer_group['approval']) {
		$this->customer->login($this->request->post['email'], $this->request->post['password']);

		$this->session->data['payment_address_id'] = $this->customer->getAddressId();
		$this->session->data['payment_country_id'] = $this->request->post['country_id'];
		$this->session->data['payment_zone_id'] = $this->request->post['zone_id'];

		if (!empty($this->request->post['shipping_address'])) {
			$this->session->data['shipping_address_id'] = $this->customer->getAddressId();
			$this->session->data['shipping_country_id'] = $this->request->post['country_id'];
			$this->session->data['shipping_zone_id'] = $this->request->post['zone_id'];
			$this->session->data['shipping_postcode'] = $this->request->post['postcode'];					
		}
	} else {
		$json['redirect'] = $this->url->link('account/success');
	}

	unset($this->session->data['guest']);
	unset($this->session->data['shipping_method']);
	unset($this->session->data['shipping_methods']);
	unset($this->session->data['payment_method']);	
	unset($this->session->data['payment_methods']);
}	

$this->response->setOutput(json_encode($json));