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Edit File: AbstractResponse.php

<?php
/**
 * Abstract Response
 */

namespace Omnipay\Common\Message;

use Omnipay\Common\Exception\RuntimeException;
use Symfony\Component\HttpFoundation\RedirectResponse as HttpRedirectResponse;
use Symfony\Component\HttpFoundation\Response as HttpResponse;

/**
 * Abstract Response
 *
 * This abstract class implements ResponseInterface and defines a basic
 * set of functions that all Omnipay Requests are intended to include.
 *
 * Objects of this class or a subclass are usually created in the Request
 * object (subclass of AbstractRequest) as the return parameters from the
 * send() function.
 *
 * Example -- validating and sending a request:
 *
 * <code>
 *   $myResponse = $myRequest->send();
 *   // now do something with the $myResponse object, test for success, etc.
 * </code>
 *
 */
abstract class AbstractResponse implements ResponseInterface
{

/**
     * The embodied request object.
     *
     * @var RequestInterface
     */
    protected $request;

/**
     * The data contained in the response.
     *
     * @var mixed
     */
    protected $data;

/**
     * Constructor
     *
     * @param RequestInterface $request the initiating request.
     * @param mixed $data
     */
    public function __construct(RequestInterface $request, $data)
    {
        $this->request = $request;
        $this->data = $data;
    }

/**
     * Get the initiating request object.
     *
     * @return RequestInterface
     */
    public function getRequest()
    {
        return $this->request;
    }

/**
     * Is the response successful?
     *
     * @return boolean
     */
    public function isPending()
    {
        return false;
    }

/**
     * Does the response require a redirect?
     *
     * @return boolean
     */
    public function isRedirect()
    {
        return false;
    }

/**
     * Is the response a transparent redirect?
     *
     * @return boolean
     */
    public function isTransparentRedirect()
    {
        return false;
    }

/**
     * Is the transaction cancelled by the user?
     *
     * @return boolean
     */
    public function isCancelled()
    {
        return false;
    }

/**
     * Get the response data.
     *
     * @return mixed
     */
    public function getData()
    {
        return $this->data;
    }

/**
     * Response Message
     *
     * @return null|string A response message from the payment gateway
     */
    public function getMessage()
    {
        return null;
    }

/**
     * Response code
     *
     * @return null|string A response code from the payment gateway
     */
    public function getCode()
    {
        return null;
    }

/**
     * Gateway Reference
     *
     * @return null|string A reference provided by the gateway to represent this transaction
     */
    public function getTransactionReference()
    {
        return null;
    }

/**
     * Get the transaction ID as generated by the merchant website.
     *
     * @return string
     */
    public function getTransactionId()
    {
        return null;
    }

/**
     * Gets the redirect target url.
     *
     * @return string
     */
    public function getRedirectUrl()
    {
        return null;
    }

/**
     * Get the required redirect method (either GET or POST).
     *
     * @return string
     */
    public function getRedirectMethod()
    {
        return 'GET';
    }

/**
     * Gets the redirect form data array, if the redirect method is POST.
     *
     * @return array
     */
    public function getRedirectData()
    {
        return [];
    }

/**
     * Automatically perform any required redirect
     *
     * This method is meant to be a helper for simple scenarios. If you want to customize the
     * redirection page, just call the getRedirectUrl() and getRedirectData() methods directly.
     *
     * @return void
     */
    public function redirect()
    {
        $this->getRedirectResponse()->send();
    }

/**
     * @return HttpRedirectResponse|HttpResponse
     */
    public function getRedirectResponse()
    {
        $this->validateRedirect();

if ('GET' === $this->getRedirectMethod()) {
            return new HttpRedirectResponse($this->getRedirectUrl());
        }

$hiddenFields = '';
        foreach ($this->getRedirectData() as $key => $value) {
            $hiddenFields .= sprintf(
                '<input type="hidden" name="%1$s" value="%2$s" />',
                htmlentities($key, ENT_QUOTES, 'UTF-8', false),
                htmlentities($value, ENT_QUOTES, 'UTF-8', false)
            )."\n";
        }

$output = '<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Redirecting...</title>
</head>
<body onload="document.forms[0].submit();">
    <form action="%1$s" method="post">
        <p>Redirecting to payment page...</p>
        <p>
            %2$s
            <input type="submit" value="Continue" />
        </p>
    </form>
</body>
</html>';
        $output = sprintf(
            $output,
            htmlentities($this->getRedirectUrl(), ENT_QUOTES, 'UTF-8', false),
            $hiddenFields
        );

return new HttpResponse($output);
    }

/**
     * Validate that the current Response is a valid redirect.
     *
     * @return void
     */
    protected function validateRedirect()
    {
        if (!$this instanceof RedirectResponseInterface || !$this->isRedirect()) {
            throw new RuntimeException('This response does not support redirection.');
        }

if (empty($this->getRedirectUrl())) {
            throw new RuntimeException('The given redirectUrl cannot be empty.');
        }

if (!in_array($this->getRedirectMethod(), ['GET', 'POST'])) {
            throw new RuntimeException('Invalid redirect method "'.$this->getRedirectMethod().'".');
        }
    }
}

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