process.php

<?php
/**
* 2007-2015 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/afl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author    PrestaShop SA <contact@prestashop.com>
*  @copyright 2007-2015 PrestaShop SA
*  @license   http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

include_once(_PS_MODULE_DIR_.'paypal/paypal.php');
include_once(_PS_MODULE_DIR_.'paypal/api/paypal_lib.php');

class PaypalExpressCheckout extends Paypal
{
	public $logs = array();

	public $method_version = '106';

	public $method;

	/** @var currency Currency used for the payment process **/
	public $currency;

	/** @var decimals Used to set prices precision **/
	public $decimals;

	/** @var result Contains the last request result **/
	public $result;

	/** @var token Contains the last token **/
	public $token;

	/* Depending of the type set, id_cart or id_product will be set */
	public $id_cart;

	// Depending of the type set, id_cart or id_product will be set
	public $id_product;

	public $id_p_attr;

	public $quantity;

	public $payer_id;

	public $available_type = array('cart', 'product', 'payment_cart');

	public $total_different_product;

	public $product_list = array();

	/* Used to know if user can validated his payment after shipping / address selection */
	public $ready = false;

	/* Take for now cart or product value */
	public $type = false;

	static public $cookie_name = 'express_checkout';

	public $cookie_key = array(
		'token', 'id_product', 'id_p_attr',
		'quantity', 'type', 'total_different_product',
		'secure_key', 'ready', 'payer_id'
	);

	public function __construct($type = false)
	{
		parent::__construct();

		// If type is sent, the cookie has to be delete
		if ($type)
		{
			unset($this->context->cookie->{self::$cookie_name});
			$this->setExpressCheckoutType($type);
		}

		// Store back the PayPal data if present under the cookie
		if (isset($this->context->cookie->{self::$cookie_name}))
		{
			$paypal = unserialize($this->context->cookie->{self::$cookie_name});

			foreach ($this->cookie_key as $key)
				$this->{$key} = $paypal[$key];
		}

		$this->currency = new Currency((int)$this->context->cart->id_currency);

		if (!Validate::isLoadedObject($this->currency))
			$this->_errors[] = $this->l('Not a valid currency');

		if (count($this->_errors))
			return false;

		$currency_decimals = is_array($this->currency) ? (int)$this->currency['decimals'] : (int)$this->currency->decimals;
		$this->decimals = $currency_decimals * _PS_PRICE_DISPLAY_PRECISION_;
	}

	// Will build the product_list depending of the type
	private function initParameters()
	{
		if (!$this->context->cart || !$this->context->cart->id)
			return false;

		$cart_currency = new Currency((int)$this->context->cart->id_currency);
		$currency_module = $this->getCurrency((int)$this->context->cart->id_currency);

		if ($cart_currency !== $currency_module)
		{
			$this->context->cart->id_currency = $currency_module->id;
			$this->context->cart->update();
		}

		$this->context->currency = $currency_module;
		$this->product_list = $this->context->cart->getProducts(true);
		return (bool)count($this->product_list);
	}

	public function setExpressCheckout($access_token = false)
	{
		$this->method = 'SetExpressCheckout';
		$fields = array();
		$this->setCancelUrl($fields);

		// Only this call need to get the value from the $_GET / $_POST array
		if (!$this->initParameters(true) || !$fields['CANCELURL'])
			return false;

		// Set payment detail (reference)
		$this->_setPaymentDetails($fields);
		$fields['SOLUTIONTYPE'] = 'Sole';
		$fields['LANDINGPAGE'] = 'Login';

		// Seller informations
		$fields['USER'] = Configuration::get('PAYPAL_API_USER');
		$fields['PWD'] = Configuration::get('PAYPAL_API_PASSWORD');
		$fields['SIGNATURE'] = Configuration::get('PAYPAL_API_SIGNATURE');

		if ($access_token)
			$fields['IDENTITYACCESSTOKEN'] = $access_token;
		
		if (Country::getIsoById(Configuration::get('PAYPAL_COUNTRY_DEFAULT')) == 'de')
			$fields['BANKTXNPENDINGURL'] = 'payment.php?banktxnpendingurl=true';

		$this->callAPI($fields);
		$this->_storeToken();
	}
	
	public function setCancelUrl(&$fields)
	{
		$url = urldecode(Tools::getValue('current_shop_url'));
		$parsed_data = parse_url($url);

		$parsed_data['scheme'] .= '://';

		if (isset($parsed_data['path']))
		{
			$parsed_data['path'] .= '?paypal_ec_canceled=1&';
			$parsed_data['query'] = isset($parsed_data['query']) ? $parsed_data['query'] : null;
		}
		else
		{
			$parsed_data['path'] = '?paypal_ec_canceled=1&';
			$parsed_data['query'] = '/'.(isset($parsed_data['query']) ? $parsed_data['query'] : null);
		}

		$cancel_url = implode($parsed_data);

		if (!empty($cancel_url))
			$fields['CANCELURL'] = $cancel_url;
	}

	public function getExpressCheckout()
	{
		$this->method = 'GetExpressCheckoutDetails';
		$fields = array();
		$fields['TOKEN'] = $this->token;

		$this->initParameters();
		$this->callAPI($fields);

		// The same token of SetExpressCheckout
		$this->_storeToken();
	}

	public function doExpressCheckout()
	{
		$this->method = 'DoExpressCheckoutPayment';
		$fields = array();
		$fields['TOKEN'] = $this->token;
		$fields['PAYERID'] = $this->payer_id;

		if (Configuration::get('PAYPAL_COUNTRY_DEFAULT') == 1)
			$fields['BANKTXNPENDINGURL'] = '';

		if (count($this->product_list) <= 0)
			$this->initParameters();

		// Set payment detail (reference)
		$this->_setPaymentDetails($fields);
		$this->callAPI($fields);

		$this->result += $fields;
	}

	private function callAPI($fields)
	{
		$this->logs = array();
		$paypal_lib = new PaypalLib();

		$this->result = $paypal_lib->makeCall($this->getAPIURL(), $this->getAPIScript(), $this->method, $fields, $this->method_version);
		$this->logs = array_merge($this->logs, $paypal_lib->getLogs());

		$this->_storeToken();
	}

	private function _setPaymentDetails(&$fields)
	{
		// Required field
		$fields['RETURNURL'] = PayPal::getShopDomainSsl(true, true)._MODULE_DIR_.$this->name.'/express_checkout/payment.php';
		$fields['NOSHIPPING'] = '1';
		$fields['BUTTONSOURCE'] = $this->getTrackingCode((int)Configuration::get('PAYPAL_PAYMENT_METHOD'));

		// Products
		$taxes = $total = 0;
		$index = -1;

		// Set cart products list
		$this->setProductsList($fields, $index, $total, $taxes);
		$this->setDiscountsList($fields, $index, $total, $taxes);
		$this->setGiftWrapping($fields, $index, $total);

		// Payment values
		$this->setPaymentValues($fields, $index, $total, $taxes);

		$id_address = (int)$this->context->cart->id_address_delivery;
		if (($id_address == 0) && ($this->context->customer))
			$id_address = Address::getFirstCustomerAddressId($this->context->customer->id);

		if ($id_address && method_exists($this->context->cart, 'isVirtualCart') && !$this->context->cart->isVirtualCart())
			$this->setShippingAddress($fields, $id_address);
		else
			$fields['NOSHIPPING'] = '0';

		foreach ($fields as &$field)
			if (is_numeric($field))
				$field = str_replace(',', '.', $field);
	}

	private function setShippingAddress(&$fields, $id_address)
	{
		$address = new Address($id_address);

		$fields['ADDROVERRIDE'] = '1';
		$fields['EMAIL'] = $this->context->customer->email;
		$fields['PAYMENTREQUEST_0_SHIPTONAME'] = $address->firstname.' '.$address->lastname;
		$fields['PAYMENTREQUEST_0_SHIPTOPHONENUM'] = (empty($address->phone)) ? $address->phone_mobile : $address->phone;
		$fields['PAYMENTREQUEST_0_SHIPTOSTREET'] = $address->address1;
		$fields['PAYMENTREQUEST_0_SHIPTOSTREET2'] = $address->address2;
		$fields['PAYMENTREQUEST_0_SHIPTOCITY'] = $address->city;

		if ($address->id_state)
		{
			$state	= new State((int)$address->id_state);
			$fields['PAYMENTREQUEST_0_SHIPTOSTATE'] = $state->iso_code;
		}

		$country	= new Country((int)$address->id_country);
		$fields['PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE'] = $country->iso_code;
		$fields['PAYMENTREQUEST_0_SHIPTOZIP'] = $address->postcode;
	}

	private function setProductsList(&$fields, &$index, &$total)
	{
		foreach ($this->product_list as $product)
		{
			$fields['L_PAYMENTREQUEST_0_NUMBER'.++$index] = (int)$product['id_product'];

			$fields['L_PAYMENTREQUEST_0_NAME'.$index] = $product['name'];

			if (isset($product['attributes']) && (empty($product['attributes']) === false))
				$fields['L_PAYMENTREQUEST_0_NAME'.$index] .= ' - '.$product['attributes'];

			$fields['L_PAYMENTREQUEST_0_DESC'.$index] = Tools::substr(strip_tags($product['description_short']), 0, 50).'...';

			$fields['L_PAYMENTREQUEST_0_AMT'.$index] = Tools::ps_round($product['price_wt'], $this->decimals);
			$fields['L_PAYMENTREQUEST_0_QTY'.$index] = $product['quantity'];

			$total = $total + ($fields['L_PAYMENTREQUEST_0_AMT'.$index] * $product['quantity']);
		}
	}

	private function setDiscountsList(&$fields, &$index, &$total)
	{
		$discounts = (_PS_VERSION_ < '1.5') ? $this->context->cart->getDiscounts() : $this->context->cart->getCartRules();

		if (count($discounts) > 0)
			foreach ($discounts as $discount)
			{
				$fields['L_PAYMENTREQUEST_0_NUMBER'.++$index] = $discount['id_discount'];

				$fields['L_PAYMENTREQUEST_0_NAME'.$index] = $discount['name'];
				if (isset($discount['description']) && !empty($discount['description']))
					$fields['L_PAYMENTREQUEST_0_DESC'.$index] = Tools::substr(strip_tags($discount['description']), 0, 50).'...';

				/* It is a discount so we store a negative value */
				$fields['L_PAYMENTREQUEST_0_AMT'.$index] = - 1 * Tools::ps_round($discount['value_real'], $this->decimals);
				$fields['L_PAYMENTREQUEST_0_QTY'.$index] = 1;

				$total = Tools::ps_round($total + $fields['L_PAYMENTREQUEST_0_AMT'.$index], $this->decimals);
			}
	}

	private function setGiftWrapping(&$fields, &$index, &$total)
	{
		if ($this->context->cart->gift == 1)
		{
			$gift_wrapping_price = $this->getGiftWrappingPrice();

			$fields['L_PAYMENTREQUEST_0_NAME'.++$index]	= $this->l('Gift wrapping');

			$fields['L_PAYMENTREQUEST_0_AMT'.$index] = Tools::ps_round($gift_wrapping_price, $this->decimals);
			$fields['L_PAYMENTREQUEST_0_QTY'.$index] = 1;

			$total = Tools::ps_round($total + $gift_wrapping_price, $this->decimals);
		}
	}

	private function setPaymentValues(&$fields, &$index, &$total, &$taxes)
	{
		if (version_compare(_PS_VERSION_, '1.5', '<'))
			$shipping_cost_wt = $this->context->cart->getOrderShippingCost();
		else
			$shipping_cost_wt = $this->context->cart->getTotalShippingCost();

		if ((bool)Configuration::get('PAYPAL_CAPTURE'))
			$fields['PAYMENTREQUEST_0_PAYMENTACTION'] = 'Authorization';
		else
			$fields['PAYMENTREQUEST_0_PAYMENTACTION'] = 'Sale';
		
		$currency = new Currency((int)$this->context->cart->id_currency);
		$fields['PAYMENTREQUEST_0_CURRENCYCODE'] = $currency->iso_code;

		/**
		 * If the total amount is lower than 1 we put the shipping cost as an item
		 * so the payment could be valid.
		 */ 
		if ($total <= 1)
		{
			$carrier = new Carrier($this->context->cart->id_carrier);
			$fields['L_PAYMENTREQUEST_0_NUMBER'.++$index] = $carrier->id_reference;
			$fields['L_PAYMENTREQUEST_0_NAME'.$index] = $carrier->name;
			$fields['L_PAYMENTREQUEST_0_AMT'.$index] = Tools::ps_round($shipping_cost_wt, $this->decimals);
			$fields['L_PAYMENTREQUEST_0_QTY'.$index] = 1;
			
			$fields['PAYMENTREQUEST_0_ITEMAMT'] = Tools::ps_round($total, $this->decimals) + Tools::ps_round($shipping_cost_wt, $this->decimals);
			$fields['PAYMENTREQUEST_0_AMT'] = $total + Tools::ps_round($shipping_cost_wt, $this->decimals);
		}
		else
		{
			if ($currency->iso_code == 'HUF')
			{ 
				$fields['PAYMENTREQUEST_0_SHIPPINGAMT'] = round($shipping_cost_wt); 
				$fields['PAYMENTREQUEST_0_ITEMAMT'] = Tools::ps_round($total, $this->decimals); 
				$fields['PAYMENTREQUEST_0_AMT'] = sprintf('%.2f', ($total + $fields['PAYMENTREQUEST_0_SHIPPINGAMT'])); 
			}
			else
			{ 
				$fields['PAYMENTREQUEST_0_SHIPPINGAMT'] = sprintf('%.2f', $shipping_cost_wt);
				$fields['PAYMENTREQUEST_0_ITEMAMT'] = Tools::ps_round($total, $this->decimals);
				$fields['PAYMENTREQUEST_0_AMT'] = sprintf('%.2f', ($total + $fields['PAYMENTREQUEST_0_SHIPPINGAMT']));
			}
		}
	}

	public function rightPaymentProcess()
	{
		$total = $this->getTotalPaid();

		// float problem with php, have to use the string cast.
		if ((isset($this->result['AMT']) && ((string)$this->result['AMT'] != (string)$total)) ||
			(isset($this->result['PAYMENTINFO_0_AMT']) && ((string)$this->result['PAYMENTINFO_0_AMT'] != (string)$total)))
			return false;	
		return true;
	}

	/**
	 * @return mixed
	 */
	public function getTotalPaid()
	{
		$total = 0.00;

		foreach ($this->product_list as $product)
		{
			$price = Tools::ps_round($product['price_wt'], $this->decimals);
			$quantity = Tools::ps_round($product['quantity'], $this->decimals);
			$total = Tools::ps_round($total + ($price * $quantity), $this->decimals);
		}

		if ($this->context->cart->gift == 1)
			$total = Tools::ps_round($total + $this->getGiftWrappingPrice(), $this->decimals);
		
		if (version_compare(_PS_VERSION_, '1.5', '<'))
		{
			$discounts = $this->context->cart->getDiscounts();
			$shipping_cost = $this->context->cart->getOrderShippingCost();
		}
		else
		{
			$discounts = $this->context->cart->getCartRules();
			$shipping_cost = $this->context->cart->getTotalShippingCost();
		}
		
		if (count($discounts) > 0)
			foreach ($discounts as $product)
			{
				$price = - 1 * Tools::ps_round($product['value_real'], $this->decimals);
				$total = Tools::ps_round($total + $price, $this->decimals);
			}
		
		return Tools::ps_round($shipping_cost, $this->decimals) + $total;
	}

	private function _storeToken()
	{
		if (is_array($this->result) && isset($this->result['TOKEN']))
			$this->token = (string)$this->result['TOKEN'];
	}

	// Store data for the next reloading page
	private function _storeCookieInfo()
	{
		$tab = array();

		foreach ($this->cookie_key as $key)
			$tab[$key] = $this->{$key};

		$this->context->cookie->{self::$cookie_name} = serialize($tab);
	}

	public function displayPaypalInContextCheckout()
	{
		$this->secure_key = $this->getSecureKey();
		$this->_storeCookieInfo();
		echo $this->token;
		die;
	}

	public function hasSucceedRequest()
	{
		if (is_array($this->result))
			foreach (array('ACK', 'PAYMENTINFO_0_ACK') as $key)
				if (isset($this->result[$key]) && Tools::strtoupper($this->result[$key]) == 'SUCCESS')
					return true;

		return false;
	}

	private function getSecureKey()
	{
		if (!count($this->product_list))
			$this->initParameters();

		$key = array();

		foreach ($this->product_list as $product)
		{
			$id_product = $product['id_product'];
			$id_product_attribute = $product['id_product_attribute'];
			$quantity = $product['quantity'];

			$key[] = $id_product.$id_product_attribute.$quantity._COOKIE_KEY_;
		}

		return md5(serialize($key));
	}

	public function isProductsListStillRight()
	{
		return $this->secure_key == $this->getSecureKey();
	}

	public function setExpressCheckoutType($type)
	{
		if (in_array($type, $this->available_type))
		{
			$this->type = $type;
			return true;
		}
		return false;
	}

	public function redirectToAPI()
	{
		$this->secure_key = $this->getSecureKey();
		$this->_storeCookieInfo();

		if ($this->useMobile())
			$url = '/cgi-bin/webscr?cmd=_express-checkout-mobile';
		else
			$url = '/websc&cmd=_express-checkout';

		if (($this->method == 'SetExpressCheckout') && (Configuration::get('PAYPAL_COUNTRY_DEFAULT') == 1) && ($this->type == 'payment_cart'))
			$url .= '&useraction=commit';
		
		Tools::redirectLink('https://'.$this->getPayPalURL().$url.'&token='.urldecode($this->token));
		exit(0);
	}

	public function redirectToCheckout($customer, $redirect = false)
	{
		$this->ready = true;
		$this->_storeCookieInfo();

		$this->context->cookie->id_customer = (int)$customer->id;
		$this->context->cookie->customer_lastname = $customer->lastname;
		$this->context->cookie->customer_firstname = $customer->firstname;
		$this->context->cookie->passwd = $customer->passwd;
		$this->context->cookie->email = $customer->email;
		$this->context->cookie->is_guest = $customer->isGuest();
		$this->context->cookie->logged = 1;

		if (version_compare(_PS_VERSION_, '1.5', '<'))
			Module::hookExec('authentication');
		else
			Hook::exec('authentication');

		if ($redirect)
		{
			$link = $this->context->link->getPageLink('order.php', false, null, array('step' => '3'));
			Tools::redirectLink($link);
			exit(0);
		}
	}
}