gistfile1.php

    public static function type_config_form($mform, $classname = 'repository') {
        parent::type_config_form($mform);
        $strrequired = get_string('required');
        $mform->addElement('text', 'access_key', get_string('access_key', 'repository_s3'));
        $mform->setType('access_key', PARAM_RAW_TRIMMED);
        $mform->addElement('text', 'secret_key', get_string('secret_key', 'repository_s3'));
        $mform->setType('secret_key', PARAM_RAW_TRIMMED);
        $mform->addElement('text', 'endpoint', get_string('endpoint', 'repository_s3'));
        $mform->setType('endpoint', PARAM_RAW_TRIMMED);
        $mform->setDefault('endpoint', 's3.amazonaws.com');
        $mform->addRule('access_key', $strrequired, 'required', null, 'client');
        $mform->addRule('secret_key', $strrequired, 'required', null, 'client');
    }