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<?php

namespace League\OAuth2\Client\Tool;

use GuzzleHttp\Exception\BadResponseException;
use GuzzleHttp\Psr7\Uri;
use InvalidArgumentException;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;

trait ProviderRedirectTrait
{
    /**
     * Maximum number of times to follow provider initiated redirects
     *
     * @var integer
     */
    protected $redirectLimit = 2;

/**
     * Retrieves a response for a given request and retrieves subsequent
     * responses, with authorization headers, if a redirect is detected.
     *
     * @param  RequestInterface $request
     * @return ResponseInterface
     * @throws BadResponseException
     */
    protected function followRequestRedirects(RequestInterface $request)
    {
        $response = null;
        $attempts = 0;

while ($attempts < $this->redirectLimit) {
            $attempts++;
            $response = $this->getHttpClient()->send($request, [
                'allow_redirects' => false
            ]);

if ($this->isRedirect($response)) {
                $redirectUrl = new Uri($response->getHeader('Location')[0]);
                $request = $request->withUri($redirectUrl);
            } else {
                break;
            }
        }

return $response;
    }

/**
     * Returns the HTTP client instance.
     *
     * @return GuzzleHttp\ClientInterface
     */
    abstract public function getHttpClient();

/**
     * Retrieves current redirect limit.
     *
     * @return integer
     */
    public function getRedirectLimit()
    {
        return $this->redirectLimit;
    }

/**
     * Determines if a given response is a redirect.
     *
     * @param  ResponseInterface  $response
     *
     * @return boolean
     */
    protected function isRedirect(ResponseInterface $response)
    {
        $statusCode = $response->getStatusCode();

return $statusCode > 300 && $statusCode < 400 && $response->hasHeader('Location');
    }

/**
     * Sends a request instance and returns a response instance.
     *
     * WARNING: This method does not attempt to catch exceptions caused by HTTP
     * errors! It is recommended to wrap this method in a try/catch block.
     *
     * @param  RequestInterface $request
     * @return ResponseInterface
     */
    public function getResponse(RequestInterface $request)
    {
        try {
            $response = $this->followRequestRedirects($request);
        } catch (BadResponseException $e) {
            $response = $e->getResponse();
        }

return $response;
    }

/**
     * Updates the redirect limit.
     *
     * @param integer $limit
     * @return League\OAuth2\Client\Provider\AbstractProvider
     * @throws InvalidArgumentException
     */
    public function setRedirectLimit($limit)
    {
        if (!is_int($limit)) {
            throw new InvalidArgumentException('redirectLimit must be an integer.');
        }

if ($limit < 1) {
            throw new InvalidArgumentException('redirectLimit must be greater than or equal to one.');
        }

$this->redirectLimit = $limit;

return $this;
    }
}