C:/xampp/htdocs/moodle/webservice/pluginfile.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle 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.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

define('AJAX_SCRIPT', true);
define('NO_MOODLE_COOKIES', true);
require_once(dirname(dirname(__FILE__)) . '/config.php');
require_once($CFG->libdir . '/filelib.php');
require_once($CFG->dirroot . '/webservice/lib.php');

//authenticate the user
$token = required_param('token', PARAM_ALPHANUM);
$webservicelib = new webservice();
$authenticationinfo = $webservicelib->authenticate_user($token);

//check the service allows file download
$enabledfiledownload = (int) ($authenticationinfo['service']->downloadfiles);
if (empty($enabledfiledownload)) {
    throw new webservice_access_exception(get_string('enabledirectdownload', 'webservice'));
}

//finally we can serve the file :)
$relativepath = get_file_argument();
file_pluginfile($relativepath, 0);