<?php
/* Copyright (C) 2022       Laurent Destailleur  <eldy@users.sourceforge.net>
 * Copyright (C) 2015       Frederic France      <frederic.france@free.fr>
 *
 * 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 3 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, see <https://www.gnu.org/licenses/>.
 */

/**
 *      \file       htdocs/core/modules/oauth/github_oauthcallback.php
 *      \ingroup    oauth
 *      \brief      Page to get oauth callback
 */

// Load Dolibarr environment
require '../../../main.inc.php';
require_once DOL_DOCUMENT_ROOT.'/includes/OAuth/bootstrap.php';
use OAuth\Common\Storage\DoliStorage;
use OAuth\Common\Consumer\Credentials;
use OAuth\OAuth2\Service\GitHub;

// Define $urlwithroot
$urlwithouturlroot = preg_replace('/'.preg_quote(DOL_URL_ROOT, '/').'$/i', '', trim($dolibarr_main_url_root));
$urlwithroot = $urlwithouturlroot.DOL_URL_ROOT; // This is to use external domain name found into config file
//$urlwithroot=DOL_MAIN_URL_ROOT;					// This is to use same domain name than current


$action = GETPOST('action', 'aZ09');
$backtourl = GETPOST('backtourl', 'alpha');
$keyforprovider = GETPOST('keyforprovider', 'aZ09');
if (empty($keyforprovider) && !empty($_SESSION["oauthkeyforproviderbeforeoauthjump"]) && (GETPOST('code') || $action == 'delete')) {
	$keyforprovider = $_SESSION["oauthkeyforproviderbeforeoauthjump"];
}


/**
 * Create a new instance of the URI class with the current URI, stripping the query string
 */
$uriFactory = new \OAuth\Common\Http\Uri\UriFactory();
//$currentUri = $uriFactory->createFromSuperGlobalArray($_SERVER);
//$currentUri->setQuery('');
$currentUri = $uriFactory->createFromAbsolute($urlwithroot.'/core/modules/oauth/github_oauthcallback.php');


/**
 * Load the credential for the service
 */

/** @var $serviceFactory \OAuth\ServiceFactory An OAuth service factory. */
$serviceFactory = new \OAuth\ServiceFactory();
$httpClient = new \OAuth\Common\Http\Client\CurlClient();
// TODO Set options for proxy and timeout
// $params=array('CURLXXX'=>value, ...)
//$httpClient->setCurlParameters($params);
$serviceFactory->setHttpClient($httpClient);

// Dolibarr storage
$storage = new DoliStorage($db, $conf);

// Setup the credentials for the requests
$keyforparamid = 'OAUTH_GITHUB'.($keyforprovider ? '-'.$keyforprovider : '').'_ID';
$keyforparamsecret = 'OAUTH_GITHUB'.($keyforprovider ? '-'.$keyforprovider : '').'_SECRET';
$credentials = new Credentials(
	getDolGlobalString($keyforparamid),
	getDolGlobalString($keyforparamsecret),
	$currentUri->getAbsoluteUri()
);

$requestedpermissionsarray = array();
if (GETPOST('state')) {
	$requestedpermissionsarray = explode(',', GETPOST('state')); // Example: 'user'. 'state' parameter is standard to retrieve some parameters back
}
if ($action != 'delete' && empty($requestedpermissionsarray)) {
	print 'Error, parameter state is not defined';
	exit;
}
//var_dump($requestedpermissionsarray);exit;

// Instantiate the Api service using the credentials, http client and storage mechanism for the token
$apiService = $serviceFactory->createService('GitHub', $credentials, $storage, $requestedpermissionsarray);

// access type needed to have oauth provider refreshing token
//$apiService->setAccessType('offline');

$langs->load("oauth");

if (!getDolGlobalString($keyforparamid)) {
	accessforbidden('Setup of service is not complete. Customer ID is missing');
}
if (!getDolGlobalString($keyforparamsecret)) {
	accessforbidden('Setup of service is not complete. Secret key is missing');
}


/*
 * Actions
 */

if ($action == 'delete') {
	$storage->clearToken('GitHub');

	setEventMessages($langs->trans('TokenDeleted'), null, 'mesgs');

	header('Location: '.$backtourl);
	exit();
}

if (!empty($_GET['code'])) {     // We are coming from oauth provider page
	// We should have
	//$_GET=array('code' => string 'aaaaaaaaaaaaaa' (length=20), 'state' => string 'user,public_repo' (length=16))

	dol_syslog("We are coming from the oauth provider page");
	//llxHeader('',$langs->trans("OAuthSetup"));

	//$linkback='<a href="'.DOL_URL_ROOT.'/admin/modules.php?restore_lastsearch_values=1">'.$langs->trans("BackToModuleList").'</a>';
	//print load_fiche_titre($langs->trans("OAuthSetup"),$linkback,'title_setup');

	//print dol_get_fiche_head();
	// retrieve the CSRF state parameter
	$state = isset($_GET['state']) ? $_GET['state'] : null;
	//print '<table>';

	// This was a callback request from service, get the token
	try {
		//var_dump($_GET['code']);
		//var_dump($state);
		//var_dump($apiService);      // OAuth\OAuth2\Service\GitHub

		//$token = $apiService->requestAccessToken($_GET['code'], $state);
		$token = $apiService->requestAccessToken($_GET['code']);
		// Github is a service that does not need state to be stored.
		// Into constructor of GitHub, the call
		// parent::__construct($credentials, $httpClient, $storage, $scopes, $baseApiUri)
		// has not the ending parameter to true like the Google class constructor.

		setEventMessages($langs->trans('NewTokenStored'), null, 'mesgs'); // Stored into object managed by class DoliStorage so into table oauth_token

		$backtourl = $_SESSION["backtourlsavedbeforeoauthjump"];
		unset($_SESSION["backtourlsavedbeforeoauthjump"]);

		header('Location: '.$backtourl);
		exit();
	} catch (Exception $e) {
		print $e->getMessage();
	}
} else { // If entry on page with no parameter, we arrive here
	$_SESSION["backtourlsavedbeforeoauthjump"] = $backtourl;
	$_SESSION["oauthkeyforproviderbeforeoauthjump"] = $keyforprovider;
	$_SESSION['oauthstateanticsrf'] = $state;

	// This may create record into oauth_state before the header redirect.
	// Creation of record with state in this tables depend on the Provider used (see its constructor).
	if (GETPOST('state')) {
		$url = $apiService->getAuthorizationUri(array('state' => GETPOST('state')));
	} else {
		$url = $apiService->getAuthorizationUri(); // Parameter state will be randomly generated
	}

	// we go on oauth provider authorization page
	header('Location: '.$url);
	exit();
}


/*
 * View
 */

// No view at all, just actions

$db->close();