WP_Ooyala_Backlot::sign_request PHP Method

    private function sign_request($request, $params)
    {
        $defaults = array('api_key' => $this->api_key, 'expires' => time() + 900);
        $params = wp_parse_args($params, $defaults);
        $signature = $this->api_secret . $request['method'] . $request['path'];
        ksort($params);
        foreach ($params as $key => $val) {
            $signature .= $key . '=' . $val;
        }
        $signature .= empty($request['body']) ? '' : $request['body'];
        $signature = hash('sha256', $signature, true);
        $signature = preg_replace('#=+$#', '', trim(base64_encode($signature)));
        return $signature;
    }