Subversion Repositories oidplus

<?php

/*

 * OIDplus 2.0

 * Copyright 2019 - 2021 Daniel Marschall, ViaThinkSoft

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

# More information about the OAuth2 implementation:

# - https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow

# - https://developers.facebook.com/tools/explorer/

require_once __DIR__ . '/../../../includes/oidplus.inc.php';

OIDplus::init(true);

set_exception_handler(array('OIDplusGui', 'html_exception_handler'));

if (OIDplus::baseConfig()->getValue('DISABLE_PLUGIN_OIDplusPagePublicLoginFacebook', false)) {

        throw new OIDplusException(_L('This plugin was disabled by the system administrator!'));

}

if (!OIDplus::baseConfig()->getValue('FACEBOOK_OAUTH2_ENABLED', false)) {

        throw new OIDplusException(_L('Facebook OAuth authentication is disabled on this system.'));

}

_CheckParamExists($_GET, 'code');

_CheckParamExists($_GET, 'state');

_CheckParamExists($_COOKIE, 'csrf_token_weak');

if ($_GET['state'] != $_COOKIE['csrf_token_weak']) {

        die(_L('Wrong CSRF Token'));

}

if (!function_exists('curl_init')) {

        die(_L('The "%1" PHP extension is not installed at your system. Please enable the PHP extension <code>%2</code>.','CURL','php_curl'));

}

// Get access token

$ch = curl_init();

if (ini_get('curl.cainfo') == '') curl_setopt($ch, CURLOPT_CAINFO, OIDplus::localpath() . '3p/certs/cacert.pem');

curl_setopt($ch, CURLOPT_URL,"https://graph.facebook.com/v8.0/oauth/access_token?".

        "client_id=".urlencode(OIDplus::baseConfig()->getValue('FACEBOOK_OAUTH2_CLIENT_ID'))."&".

        "redirect_uri=".urlencode(OIDplus::webpath(__DIR__,false).'oauth.php')."&".

        "client_secret=".urlencode(OIDplus::baseConfig()->getValue('FACEBOOK_OAUTH2_CLIENT_SECRET'))."&".

        "code=".$_GET['code']

);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$cont = curl_exec($ch);

curl_close($ch);

$data = json_decode($cont,true);

if (isset($data['error'])) {

        echo '<h2>Error at step 2</h2>';

        echo '<p>'.$data['error']['message'].'</p>';

        die();

}

$access_token = $data['access_token'];

// Get user infos

$ch = curl_init();

if (ini_get('curl.cainfo') == '') curl_setopt($ch, CURLOPT_CAINFO, OIDplus::localpath() . '3p/certs/cacert.pem');

curl_setopt($ch, CURLOPT_URL,"https://graph.facebook.com/v8.0/me?".

        "fields=id,email,name&".

        "access_token=".urlencode($access_token)

);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$cont = curl_exec($ch);

curl_close($ch);

$data = json_decode($cont,true);

if (isset($data['error'])) {

        throw new OIDplusException(_L('Error receiving the authentication token from %1: %2','Facebook',$data['error']['message']));

}

$personal_name = $data['name'];

$email = !isset($data['email']) ? '' : $data['email'];

if (empty($email)) {

        throw new OIDplusException(_L('Your Facebook account does not have an email address.'));

}

// Everything's done! Now login and/or create account

if (!empty($email)) {

        $ra = new OIDplusRA($email);

        if (!$ra->existing()) {

                $ra->register_ra(null); // create a user account without password

                OIDplus::db()->query("update ###ra set ra_name = ?, personal_name = ? where email = ?", array($personal_name, $personal_name, $email));

                OIDplus::logger()->log("[INFO]RA($email)!", "RA '$email' was created because of successful Facebook OAuth2 login");

        }

        OIDplus::authUtils()->raLoginEx($email, $remember_me=false, 'Facebook-OAuth2');

        OIDplus::db()->query("UPDATE ###ra set last_login = ".OIDplus::db()->sqlDate()." where email = ?", array($email));

        // Go back to OIDplus

        header('Location:'.OIDplus::webpath(null,false));

}