friendica/src/Security/OAuth.php

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<?php
/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Security;
use Friendica\Core\Logger;
use Friendica\Database\Database;
use Friendica\Database\DBA;
use Friendica\Util\DateTimeFormat;
/**
* OAuth Server
*/
class OAuth
{
const SCOPE_READ = 'read';
const SCOPE_WRITE = 'write';
const SCOPE_FOLLOW = 'follow';
const SCOPE_PUSH = 'push';
/**
* @var bool|int
*/
protected static $current_user_id = 0;
/**
* @var array
*/
protected static $current_token = [];
/**
* Check if the provided scope does exist
*
* @param string $scope the requested scope (read, write, follow, push)
*
* @return bool "true" if the scope is allowed
*/
public static function isAllowedScope(string $scope)
{
$token = self::getCurrentApplicationToken();
if (empty($token)) {
Logger::notice('Empty application token');
return false;
}
if (!isset($token[$scope])) {
Logger::warning('The requested scope does not exist', ['scope' => $scope, 'application' => $token]);
return false;
}
if (empty($token[$scope])) {
Logger::warning('The requested scope is not allowed', ['scope' => $scope, 'application' => $token]);
return false;
}
return true;
}
/**
* Get current application token
*
* @return array token
*/
public static function getCurrentApplicationToken()
{
if (empty(self::$current_token)) {
self::$current_token = self::getTokenByBearer();
}
return self::$current_token;
}
/**
* Get current user id, returns 0 if not logged in
*
* @return int User ID
*/
public static function getCurrentUserID()
{
if (empty(self::$current_user_id)) {
$token = self::getCurrentApplicationToken();
if (!empty($token['uid'])) {
self::$current_user_id = $token['uid'];
} else {
self::$current_user_id = 0;
}
}
return (int)self::$current_user_id;
}
/**
* Get the user token via the Bearer token
*
* @return array User Token
*/
private static function getTokenByBearer()
{
$authorization = $_SERVER['HTTP_AUTHORIZATION'] ?? '';
if (substr($authorization, 0, 7) != 'Bearer ') {
return [];
}
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$bearer = trim(substr($authorization, 7));
$condition = ['access_token' => $bearer];
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$token = DBA::selectFirst('application-view', ['uid', 'id', 'name', 'website', 'created_at', 'read', 'write', 'follow', 'push'], $condition);
if (!DBA::isResult($token)) {
Logger::warning('Token not found', $condition);
return [];
}
Logger::debug('Token found', $token);
return $token;
}
/**
* Get the application record via the provided request header fields
*
* @param string $client_id
* @param string $client_secret
* @param string $redirect_uri
* @return array application record
*/
public static function getApplication(string $client_id, string $client_secret, string $redirect_uri)
{
$condition = ['client_id' => $client_id];
if (!empty($client_secret)) {
$condition['client_secret'] = $client_secret;
}
if (!empty($redirect_uri)) {
$condition['redirect_uri'] = $redirect_uri;
}
$application = DBA::selectFirst('application', [], $condition);
if (!DBA::isResult($application)) {
Logger::warning('Application not found', $condition);
return [];
}
return $application;
}
/**
* Check if an token for the application and user exists
*
* @param array $application
* @param integer $uid
* @return boolean
*/
public static function existsTokenForUser(array $application, int $uid)
{
return DBA::exists('application-token', ['application-id' => $application['id'], 'uid' => $uid]);
}
/**
* Fetch the token for the given application and user
*
* @param array $application
* @param integer $uid
* @return array application record
*/
public static function getTokenForUser(array $application, int $uid)
{
return DBA::selectFirst('application-token', [], ['application-id' => $application['id'], 'uid' => $uid]);
}
/**
* Create and fetch an token for the application and user
*
* @param array $application
* @param integer $uid
* @param string $scope
* @return array application record
*/
public static function createTokenForUser(array $application, int $uid, string $scope)
{
$code = bin2hex(random_bytes(32));
$access_token = bin2hex(random_bytes(32));
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$fields = [
'application-id' => $application['id'],
'uid' => $uid,
'code' => $code,
'access_token' => $access_token,
'scopes' => $scope,
'read' => (stripos($scope, self::SCOPE_READ) !== false),
'write' => (stripos($scope, self::SCOPE_WRITE) !== false),
'follow' => (stripos($scope, self::SCOPE_FOLLOW) !== false),
'push' => (stripos($scope, self::SCOPE_PUSH) !== false),
'created_at' => DateTimeFormat::utcNow(DateTimeFormat::MYSQL)];
foreach ([self::SCOPE_READ, self::SCOPE_WRITE, self::SCOPE_WRITE, self::SCOPE_PUSH] as $scope) {
if ($fields[$scope] && !$application[$scope]) {
Logger::warning('Requested token scope is not allowed for the application', ['token' => $fields, 'application' => $application]);
}
}
if (!DBA::insert('application-token', $fields, Database::INSERT_UPDATE)) {
return [];
}
return DBA::selectFirst('application-token', [], ['application-id' => $application['id'], 'uid' => $uid]);
}
}