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<?php

namespace OAuth2;

use Symfony\Component\HttpFoundation\Response;

/**
 * Redirect the end-user's user agent with error message.
 *
 * @see     http://tools.ietf.org/html/draft-ietf-oauth-v2-20#section-4.1
 *
 * @ingroup oauth2_error
 */
class OAuth2RedirectException extends OAuth2ServerException
{
    /**
     * Redirect URI
     *
     * @var string
     */
    protected $redirectUri;

    /**
     * Parameters are added into 'query' or 'fragment'
     *
     * @var string
     */
    protected $method;

    /**
     * @param string $redirectUri      An absolute URI to which the authorization server will redirect the user-agent to when the end-user authorization step is completed.
     * @param string $error            A single error code as described in Section 4.1.2.1
     * @param string $errorDescription (optional) A human-readable text providing additional information, used to assist in the understanding and resolution of the error occurred.
     * @param string $state            (optional) REQUIRED if the "state" parameter was present in the client authorization request. Set to the exact value received from the client.
     *
     * @see     http://tools.ietf.org/html/draft-ietf-oauth-v2-20#section-4.1.2.1
     *
     * @ingroup oauth2_error
     */
    public function __construct($redirectUri, $error, $errorDescription = null, $state = null, $method = OAuth2::TRANSPORT_QUERY)
    {
        parent::__construct(Response::HTTP_FOUND, $error, $errorDescription);

        $this->method = $method;
        $this->redirectUri = $redirectUri;
        if ($state) {
            $this->errorData['state'] = $state;
        }
    }

    /**
     * Redirect the user agent.
     *
     * @return array
     *
     * @ingroup oauth2_section_4
     */
    public function getResponseHeaders()
    {
        $params = array($this->method => $this->errorData);

        return array(
            'Location' => $this->buildUri($this->redirectUri, $params),
        );
    }

    /**
     * Build the absolute URI based on supplied URI and parameters.
     *
     * @param string $uri    An absolute URI.
     * @param array  $params Parameters to be append as GET.
     *
     * @return string An absolute URI with supplied parameters.
     *
     * @ingroup oauth2_section_4
     */
    protected function buildUri($uri, $params)
    {
        $parse_url = parse_url($uri);

        // Add our params to the parsed uri
        foreach ($params as $k => $v) {
            if (isset($parse_url[$k])) {
                $parse_url[$k] .= "&" . http_build_query($v);
            } else {
                $parse_url[$k] = http_build_query($v);
            }
        }

        // Put humpty dumpty back together
        return
            ((isset($parse_url["scheme"])) ? $parse_url["scheme"] . "://" : "")
            . ((isset($parse_url["user"])) ? $parse_url["user"] . ((isset($parse_url["pass"])) ? ":" . $parse_url["pass"] : "") . "@" : "")
            . ((isset($parse_url["host"])) ? $parse_url["host"] : "")
            . ((isset($parse_url["port"])) ? ":" . $parse_url["port"] : "")
            . ((isset($parse_url["path"])) ? $parse_url["path"] : "")
            . ((isset($parse_url["query"])) ? "?" . $parse_url["query"] : "")
            . ((isset($parse_url["fragment"])) ? "#" . $parse_url["fragment"] : "");
    }
}