<?php

/**
 * MyDMS. Document Management System
 * Copyright (C) 2002-2005 Markus Westphal
 * Copyright (C) 2006-2008 Malcolm Cowe
 * Copyright (C) 2010 Matteo Lucarelli
 * Copyright (C) 2010-2024 Uwe Steinmann
 *
 * PHP version 8
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * @category SeedDMS
 * @package  SeedDMS
 * @author   Uwe Steinmann <info@seeddms.org>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://www.seeddms.org Main Site
 */

/* Middleware for authentication based on session */
class SeedDMS_Auth_Middleware_Session { /* {{{ */

	private $container;

	private $responsefactory;

	public function __construct($container, $responsefactory) {
		$this->container = $container;
		$this->responsefactory = $responsefactory;
	}

	/**
	 * Example middleware invokable class
	 *
	 * @param  \Psr\Http\Message\ServerRequestInterface $request  PSR7 request
	 * @param  \Psr\Http\Message\ResponseInterface      $response PSR7 response
	 * @param  callable                                 $next     Next middleware
	 *
	 * @return \Psr\Http\Message\ResponseInterface
	 */
	public function __invoke($request, $handler) {
		// $this->container has the DI
		$dms = $this->container->get('dms');
		$settings = $this->container->get('config');
		$logger = $this->container->get('logger');
		$userobj = null;
		if ($this->container->has('userobj')) {
			$userobj = $this->container->get('userobj');
		}

		if ($userobj) {
			$response = $handler->handle($request);
			return $response;
		}

		$logger->log("Invoke AuthSessionMiddleware for method " . $request->getMethod() . " on '" . $request->getUri()->getPath() . "'", PEAR_LOG_INFO);
		require_once("inc/inc.ClassSession.php");
		$session = new SeedDMS_Session($dms->getDb());
		if (isset($_COOKIE["mydms_session"])) {
			$dms_session = $_COOKIE["mydms_session"];
			$logger->log("Session key: " . $dms_session, PEAR_LOG_DEBUG);
			if (!$resArr = $session->load($dms_session)) {
				/* Delete Cookie */
				setcookie("mydms_session", $dms_session, time() - 3600, $settings->_httpRoot);
				$logger->log("Session for id '" . $dms_session . "' has gone", PEAR_LOG_ERR);
				$response = $this->responsefactory->createResponse();
				return $response->withStatus(403);
			}

			/* Load user data */
			$userobj = $dms->getUser($resArr["userID"]);
			if (!is_object($userobj)) {
				/* Delete Cookie */
				setcookie("mydms_session", $dms_session, time() - 3600, $settings->_httpRoot);
				if ($settings->_enableGuestLogin) {
					if (!($userobj = $dms->getUser($settings->_guestID))) {
						$response = $this->responsefactory->createResponse();
						return $response->withStatus(403);
					}
				} else {
					return $response->withStatus(403);
				}
			}
			if ($userobj->isAdmin()) {
				if ($resArr["su"]) {
					if (!($userobj = $dms->getUser($resArr["su"]))) {
						$response = $this->responsefactory->createResponse();
						return $response->withStatus(403);
					}
				}
			}
			$dms->setUser($userobj);
		} else {
			$response = $this->responsefactory->createResponse();
			return $response->withStatus(403);
		}
		$this->container->set('userobj', $userobj);

		$response = $handler->handle($request);
		return $response;
	}
} /* }}} */

/**
 * Middleware for authentication based on basic authentication
 *
 **/
class SeedDMS_Auth_Middleware_Basic { /* {{{ */

	private $container;

	private $responsefactory;

	public function __construct($container, $responsefactory) {
		$this->container = $container;
		$this->responsefactory = $responsefactory;
	}

	/**
	 * Basic authentication middleware invokable class
	 *
	 * @param  \Psr\Http\Message\ServerRequestInterface $request  PSR7 request
	 * @param  \Psr\Http\Message\ResponseInterface      $response PSR7 response
	 * @param  callable                                 $next     Next middleware
	 *
	 * @return \Psr\Http\Message\ResponseInterface
	 */
	public function __invoke($request, $handler) {
		$dms = $this->container->get('dms');
		$settings = $this->container->get('config');
		$logger = $this->container->get('logger');
		$userobj = null;
		if ($this->container->has('userobj')) {
			$userobj = $this->container->get('userobj');
		}

		if ($userobj) {
			$response = $handler->handle($request);
			return $response;
		}

		$logger->log("Invoke AuthBasicMiddleware for method " . $request->getMethod() . " on '" . $request->getUri()->getPath() . "'", PEAR_LOG_INFO);
		$environment = $request->getServerParams();
		if(!empty($environment['HTTP_AUTHORIZATION'])) {
			$tmp = explode(' ', $environment['HTTP_AUTHORIZATION'], 2);
			switch($tmp[0]) {
			case 'Basic':
				$logger->log("Basic authentication with ".$tmp[0]."=".$tmp[1], PEAR_LOG_INFO);
				$authenticator = $this->container->get('authenticator');
				$kk = explode(':', base64_decode($tmp[1]));
				$userobj = $authenticator->authenticate($kk[0], $kk[1]);
				if(!$userobj) {
					$logger->log("Login with basic authentication for '".$kk[0]."' failed", PEAR_LOG_ERR);
					$response = $this->responsefactory->createResponse();
					return $response->withStatus(403);
				}
				$dms->setUser($userobj);
				if($this->container instanceof \Slim\Container)
					$this->container['userobj'] = $userobj;
				else
					$this->container->set('userobj', $userobj);
				$logger->log("Login with basic authentication as '".$userobj->getLogin()."' successful", PEAR_LOG_INFO);
				break;
			}
		}
		$this->container->set('userobj', $userobj);

		if(!$userobj)
			$logger->log("Not yet authenticated. Pass on to next middleware", PEAR_LOG_INFO);
		else
			$logger->log("Authenticated as ".(is_object($userobj) ? $userobj->getLogin() : "annon").". Pass on to next middleware", PEAR_LOG_INFO);

		/* Always pass on to the next middleware. If that middleware does
		 * authentication, then it should first check if 'userobj' in the container
		 * is already set. The authentication shipped with seeddms restapi does that
		 * and skips its own authentication, if userobj already exists.
		 */
		$response = $handler->handle($request);
		return $response;
	}
} /* }}} */

/**
 * Middleware for authentication based on token
 *
 **/
class SeedDMS_Auth_Middleware_Token { /* {{{ */

	private $container;

	private $responsefactory;

	public function __construct($container, $responsefactory) {
		$this->container = $container;
		$this->responsefactory = $responsefactory;
	}

	/**
	 * Basic authentication middleware invokable class
	 *
	 * @param  \Psr\Http\Message\ServerRequestInterface $request  PSR7 request
	 * @param  \Psr\Http\Message\ResponseInterface      $response PSR7 response
	 * @param  callable                                 $next     Next middleware
	 *
	 * @return \Psr\Http\Message\ResponseInterface
	 */
	public function __invoke($request, $handler) {
		$dms = $this->container->get('dms');
		$settings = $this->container->get('config');
		$logger = $this->container->get('logger');
		$userobj = null;
		if ($this->container->has('userobj')) {
			$userobj = $this->container->get('userobj');
		}

		if ($userobj) {
			$response = $handler->handle($request);
			return $response;
		}

		$logger->log("Invoke AuthTokenMiddleware for method " . $request->getMethod() . " on '" . $request->getUri()->getPath() . "'", PEAR_LOG_INFO);
		$environment = $request->getServerParams();
		/* Do not even try to authenticate if HTTP_AUTHORIZATION is empty, contains
		 * a ' ' (in case of Basic authentication), the api key is not set, the api
		 * user is not set.
		 */
		if (!empty($environment['HTTP_AUTHORIZATION']) && strstr($environment['HTTP_AUTHORIZATION'], ' ') === false && !empty($settings->_apiKey) && !empty($settings->_apiUserId)) {
			$logger->log("Authorization key: ".$environment['HTTP_AUTHORIZATION'], PEAR_LOG_DEBUG);
			if($settings->_apiKey == $environment['HTTP_AUTHORIZATION']) {
				if(!($userobj = $dms->getUser($settings->_apiUserId))) {
					$response = $this->responsefactory->createResponse();
					$response = $response->withHeader('Content-Type', 'application/json');
					$response = $response->withStatus(403);
					$response->getBody()->write(
						(string)json_encode(
							['success'=>false, 'message'=>'Invalid user associated with api key', 'data'=>''],
							JSON_UNESCAPED_SLASHES | JSON_PARTIAL_OUTPUT_ON_ERROR
						)
					);
					return $response;
				}
			} else {
				$response = $this->responsefactory->createResponse();
				$response = $response->withHeader('Content-Type', 'application/json');
				$response = $response->withStatus(403);
				$response->getBody()->write(
					(string)json_encode(
						['success'=>false, 'message'=>'Wrong api key', 'data'=>''],
						JSON_UNESCAPED_SLASHES | JSON_PARTIAL_OUTPUT_ON_ERROR
					)
				);
				return $response;
			}
			$logger->log("Login with apikey as '".$userobj->getLogin()."' successful", PEAR_LOG_INFO);
		}

		$this->container->set('userobj', $userobj);

		if(!$userobj)
			$logger->log("Not yet authenticated. Pass on to next middleware", PEAR_LOG_INFO);
		else
			$logger->log("Authenticated as ".(is_object($userobj) ? $userobj->getLogin() : "annon").". Pass on to next middleware", PEAR_LOG_INFO);

		/* Always pass on to the next middleware. If that middleware does
		 * authentication, then it should first check if 'userobj' in the container
		 * is already set. The authentication shipped with seeddms restapi does that
		 * and skips its own authentication, if userobj already exists.
		 */
		$response = $handler->handle($request);
		return $response;
	}
} /* }}} */