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<?php
/**
 * Part of the Joomla Framework OAuth2 Package
 *
 * @copyright  Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\OAuth2;

use Joomla\Application\WebApplicationInterface;
use Joomla\Http\Exception\UnexpectedResponseException;
use Joomla\Http\Http;
use Joomla\Http\HttpFactory;
use Joomla\Input\Input;
use Joomla\Uri\Uri;

/**
 * Joomla Framework class for interacting with an OAuth 2.0 server.
 *
 * @since  1.0
 */
class Client
{
	/**
	 * Options for the Client object.
	 *
	 * @var    array|\ArrayAccess
	 * @since  1.0
	 */
	protected $options;

/**
	 * The HTTP client object to use in sending HTTP requests.
	 *
	 * @var    Http
	 * @since  1.0
	 */
	protected $http;

/**
	 * The input object to use in retrieving GET/POST data.
	 *
	 * @var    Input
	 * @since  1.0
	 */
	protected $input;

/**
	 * The application object to send HTTP headers for redirects.
	 *
	 * @var    WebApplicationInterface
	 * @since  1.0
	 */
	protected $application;

/**
	 * Constructor.
	 *
	 * @param   array|\ArrayAccess       $options      OAuth2 Client options object
	 * @param   Http                     $http         The HTTP client object
	 * @param   Input                    $input        The input object
	 * @param   WebApplicationInterface  $application  The application object
	 *
	 * @since   1.0
	 */
	public function __construct($options = [], Http $http = null, Input $input = null, WebApplicationInterface $application = null)
	{
		if (!\is_array($options) && !($options instanceof \ArrayAccess))
		{
			throw new \InvalidArgumentException(
				'The options param must be an array or implement the ArrayAccess interface.'
			);
		}

$this->options     = $options;
		$this->http        = $http ?: HttpFactory::getHttp($this->options);
		$this->input       = $input ?: ($application ? $application->getInput() : new Input);
		$this->application = $application;
	}

/**
	 * Get the access token or redirect to the authentication URL.
	 *
	 * @return  array|boolean  The access token or false on failure
	 *
	 * @since   1.0
	 * @throws  UnexpectedResponseException
	 * @throws  \RuntimeException
	 */
	public function authenticate()
	{
		if ($data['code'] = $this->input->get('code', false, 'raw'))
		{
			$data = [
				'grant_type'    => 'authorization_code',
				'redirect_uri'  => $this->getOption('redirecturi'),
				'client_id'     => $this->getOption('clientid'),
				'client_secret' => $this->getOption('clientsecret'),
			];

$response = $this->http->post($this->getOption('tokenurl'), $data);

if (!($response->code >= 200 && $response->code < 400))
			{
				throw new UnexpectedResponseException(
					$response,
					sprintf(
						'Error code %s received requesting access token: %s.',
						$response->code,
						$response->body
					)
				);
			}

if (strpos($response->headers['Content-Type'], 'application/json') !== false)
			{
				$token = array_merge(json_decode($response->body, true), ['created' => time()]);
			}
			else
			{
				parse_str($response->body, $token);
				$token = array_merge($token, ['created' => time()]);
			}

$this->setToken($token);

return $token;
		}

if ($this->getOption('sendheaders'))
		{
			if (!($this->application instanceof WebApplicationInterface))
			{
				throw new \RuntimeException(
					\sprintf('A "%s" implementation is required to process authentication.', WebApplicationInterface::class)
				);
			}

$this->application->redirect($this->createUrl());
		}

return false;
	}

/**
	 * Verify if the client has been authenticated
	 *
	 * @return  boolean  Is authenticated
	 *
	 * @since   1.0
	 */
	public function isAuthenticated()
	{
		$token = $this->getToken();

if (!$token || !array_key_exists('access_token', $token))
		{
			return false;
		}

if (array_key_exists('expires_in', $token) && $token['created'] + $token['expires_in'] < time() + 20)
		{
			return false;
		}

return true;
	}

/**
	 * Create the URL for authentication.
	 *
	 * @return  string
	 *
	 * @since   1.0
	 * @throws  \InvalidArgumentException
	 */
	public function createUrl()
	{
		if (!$this->getOption('authurl') || !$this->getOption('clientid'))
		{
			throw new \InvalidArgumentException('Authorization URL and client_id are required');
		}

$url = new Uri($this->getOption('authurl'));
		$url->setVar('response_type', 'code');
		$url->setVar('client_id', urlencode($this->getOption('clientid')));

if ($redirect = $this->getOption('redirecturi'))
		{
			$url->setVar('redirect_uri', urlencode($redirect));
		}

if ($scope = $this->getOption('scope'))
		{
			$scope = \is_array($scope) ? implode(' ', $scope) : $scope;
			$url->setVar('scope', urlencode($scope));
		}

if ($state = $this->getOption('state'))
		{
			$url->setVar('state', urlencode($state));
		}

if (\is_array($this->getOption('requestparams')))
		{
			foreach ($this->getOption('requestparams') as $key => $value)
			{
				$url->setVar($key, urlencode($value));
			}
		}

return (string) $url;
	}

/**
	 * Send a signed OAuth request.
	 *
	 * @param   string   $url      The URL for the request
	 * @param   mixed    $data     Either an associative array or a string to be sent with the request
	 * @param   array    $headers  The headers to send with the request
	 * @param   string   $method   The method with which to send the request
	 * @param   integer  $timeout  The timeout for the request
	 *
	 * @return  \Joomla\Http\Response
	 *
	 * @since   1.0
	 * @throws  \InvalidArgumentException
	 * @throws  \RuntimeException
	 */
	public function query($url, $data = null, $headers = [], $method = 'get', $timeout = null)
	{
		$token = $this->getToken();

if (array_key_exists('expires_in', $token) && $token['created'] + $token['expires_in'] < time() + 20)
		{
			if (!$this->getOption('userefresh'))
			{
				return false;
			}

$token = $this->refreshToken($token['refresh_token']);
		}

$url = new Uri($url);

if (!$this->getOption('authmethod') || $this->getOption('authmethod') == 'bearer')
		{
			$headers['Authorization'] = 'Bearer ' . $token['access_token'];
		}
		elseif ($this->getOption('authmethod') == 'get')
		{
			$url->setVar($this->getOption('getparam', 'access_token'), $token['access_token']);
		}

switch ($method)
		{
			case 'head':
			case 'get':
			case 'delete':
			case 'trace':
				$response = $this->http->$method($url, $headers, $timeout);

break;

case 'post':
			case 'put':
			case 'patch':
				$response = $this->http->$method($url, $data, $headers, $timeout);

break;

default:
				throw new \InvalidArgumentException('Unknown HTTP request method: ' . $method . '.');
		}

if ($response->code < 200 || $response->code >= 400)
		{
			throw new UnexpectedResponseException(
				$response,
				sprintf(
					'Error code %s received requesting data: %s.',
					$response->code,
					$response->body
				)
			);
		}

return $response;
	}

/**
	 * Get an option from the OAuth2 Client instance.
	 *
	 * @param   string  $key      The name of the option to get
	 * @param   mixed   $default  Optional default value, returned if the requested option does not exist.
	 *
	 * @return  mixed  The option value
	 *
	 * @since   1.0
	 */
	public function getOption($key, $default = null)
	{
		return $this->options[$key] ?? $default;
	}

/**
	 * Set an option for the OAuth2 Client instance.
	 *
	 * @param   string  $key    The name of the option to set
	 * @param   mixed   $value  The option value to set
	 *
	 * @return  Client  This object for method chaining
	 *
	 * @since   1.0
	 */
	public function setOption($key, $value)
	{
		$this->options[$key] = $value;

return $this;
	}

/**
	 * Get the access token from the Client instance.
	 *
	 * @return  array  The access token
	 *
	 * @since   1.0
	 */
	public function getToken()
	{
		return $this->getOption('accesstoken');
	}

/**
	 * Set an option for the Client instance.
	 *
	 * @param   array  $value  The access token
	 *
	 * @return  Client  This object for method chaining
	 *
	 * @since   1.0
	 */
	public function setToken($value)
	{
		if (\is_array($value) && !array_key_exists('expires_in', $value) && array_key_exists('expires', $value))
		{
			$value['expires_in'] = $value['expires'];
			unset($value['expires']);
		}

$this->setOption('accesstoken', $value);

return $this;
	}

/**
	 * Refresh the access token instance.
	 *
	 * @param   string  $token  The refresh token
	 *
	 * @return  array  The new access token
	 *
	 * @since   1.0
	 * @throws  UnexpectedResponseException
	 * @throws  \RuntimeException
	 */
	public function refreshToken($token = null)
	{
		if (!$this->getOption('userefresh'))
		{
			throw new \RuntimeException('Refresh token is not supported for this OAuth instance.');
		}

if (!$token)
		{
			$token = $this->getToken();

if (!array_key_exists('refresh_token', $token))
			{
				throw new \RuntimeException('No refresh token is available.');
			}

$token = $token['refresh_token'];
		}

$data = [
			'grant_type'    => 'refresh_token',
			'refresh_token' => $token,
			'client_id'     => $this->getOption('clientid'),
			'client_secret' => $this->getOption('clientsecret'),
		];

$response = $this->http->post($this->getOption('tokenurl'), $data);

if (!($response->code >= 200 || $response->code < 400))
		{
			throw new UnexpectedResponseException(
				$response,
				sprintf(
					'Error code %s received refreshing token: %s.',
					$response->code,
					$response->body
				)
			);
		}

if (strpos($response->headers['Content-Type'], 'application/json') !== false)
		{
			$token = array_merge(json_decode($response->body, true), ['created' => time()]);
		}
		else
		{
			parse_str($response->body, $token);
			$token = array_merge($token, ['created' => time()]);
		}

$this->setToken($token);

return $token;
	}
}