yf_oauth_driver2 abstract class

    public function authorize()
    {
        $url = $this->url_authorize . '?' . http_build_query((array) $this->url_params + (array) $this->url_params_authorize + [
            'client_id' => $this->client_id,
            'redirect_uri' => $this->redirect_uri,
            'scope' => $this->scope,
            'response_type' => 'code',
            'state' => md5(microtime() . rand(1, 10000000)), // An unguessable random string. It is used to protect against cross-site request forgery attacks.
        ]);
        js_redirect($url, $url_rewrite = false);
        return false;
    }

    public function get_access_token()
    {
        $access_token = $this->_storage_get('access_token');
        if ($access_token) {
            return $access_token;
        }
        $code = ($_GET['code'] ?? null);
        if ( ! $code) {
            return $this->authorize();
        }
        $url_params = (array) $this->url_params + (array) $this->url_params_access_token + [
            'client_id' => $this->client_id,
            'client_secret' => $this->client_secret,
            'redirect_uri' => $this->redirect_uri,
            'code' => $code,
        ];
        $opts = null;
        if ($this->get_access_token_method == 'POST') {
            $url = $this->url_access_token;
            $opts = [
                'post' => $url_params,
            ];
        } else {
            $url = $this->url_access_token . '?' . http_build_query($url_params);
        }
        $response = null;
        $result = common()->get_remote_page($url, $cache = false, $opts, $response);
        $result = $this->_decode_result($result, $response, __FUNCTION__);
        if (isset($result['error']) || substr($response['http_code'], 0, 1) == '4') {
            js_redirect($this->redirect_uri, $url_rewrite = false);
            return false;
        }
        $this->_storage_set('access_token_request', ['result' => $result, 'response' => $response]);
        $this->_storage_set('access_token', $result['access_token']);

        return $this->_storage_get('access_token');
    }

    public function get_user_info()
    {
        if (DEBUG_MODE && ($_GET['oauth_clean'] ?? null)) {
            $this->_storage_clean();
        }
        $access_token = $this->_storage_get('access_token');
        if ( ! $access_token) {
            $access_token = $this->get_access_token();
            if ( ! $access_token) {
                $this->_storage_clean();
                js_redirect($this->redirect_uri, $url_rewrite = false);
                return false;
            }
        }
        $url = $this->url_user . '?' . http_build_query((array) $this->url_params + (array) $this->url_params_user_info + [
                'access_token' => $access_token,
            ]);
        $opts = null;
        if ($this->get_user_info_user_bearer) {
            $url = $this->url_user;
            $opts = [
                    'custom_header' => ['Authorization: Bearer ' . $access_token],
                ];
        }
        $response = null;
        $result = common()->get_remote_page($url, $cache = false, $opts, $response);
        $result = $this->_decode_result($result, $response, __FUNCTION__);
        if (isset($result['error']) || substr($response['http_code'], 0, 1) == '4') {
            $this->_storage_clean();
            js_redirect($this->redirect_uri, $url_rewrite = false);
            return false;
        }
        $this->_storage_set('user_info_request', ['result' => $result, 'response' => $response]);
        $this->_storage_set('user', $result);

        return $this->_storage_get('user');
    }

    public function login($params = [])
    {
        $config = _class('oauth')->_load_oauth_config();
        $called_class = get_called_class();
        if (substr($called_class, 0, strlen(YF_PREFIX)) == YF_PREFIX) {
            $called_class = substr($called_class, strlen(YF_PREFIX));
        }
        $this->provider = substr($called_class, strlen('oauth_driver_')); // yf_oauth_driver_github, yf_oauth_driver2
        if ( ! $config[$this->provider] || ! $config[$this->provider]['client_id'] || ! $config[$this->provider]['client_secret']) {
            trigger_error('Error: no config client_id and client_secret for provider: ' . $this->provider, E_USER_WARNING);
            return false;
        }
        $this->redirect_uri = url('/@object/@action/@id');
        if ($this->redirect_uri_force_https) {
            $this->redirect_uri = str_replace('http://', 'https://', $this->redirect_uri);
        }
        $this->client_id = ($config[$this->provider]['client_id'] ?? null) ?: '';
        $application_line = __LINE__;
        $this->client_secret = ($config[$this->provider]['client_secret'] ?? null) ?: '';
        $this->client_public = ($config[$this->provider]['client_public'] ?? null) ?: '';
        return $this->get_user_info();
    }

    public function _decode_result($result, $response, $for_method = '')
    {
        if (strpos($response['content_type'], 'json') !== false || strpos($response['content_type'], 'javascript') !== false || is_string($result) && in_array(substr(ltrim($result), 0, 1), ['[', '{'])) {
            $result = json_decode($result, $assoc = true);
        } elseif (strpos($response['content_type'], 'application/x-www-form-urlencoded') !== false) {
            parse_str($result, $try_parsed);
            if (is_array($try_parsed) && count((array) $try_parsed) > 1) {
                $result = $try_parsed;
            }
        }
        if (is_string($result) && in_array(substr(ltrim($result), 0, 1), ['[', '{'])) {
            $result = json_decode($result, $assoc = true);
        }
        return $result;
    }

    abstract public function _get_user_info_for_auth($raw = []);

    public function _storage_clean()
    {
        if (isset($_SESSION['oauth'][$this->provider])) {
            unset($_SESSION['oauth'][$this->provider]);
        }
    }

    public function _storage_get($key)
    {
        return isset($_SESSION['oauth'][$this->provider][$key]) ? ($_SESSION['oauth'][$this->provider][$key] ?? null) : false;
    }

    public function _storage_set($key, $val = null)
    {
        $_SESSION['oauth'][$this->provider][$key] = $val;
        return $val;
    }