Scripted REST Resource

(function process( /*RESTAPIRequest*/ request, /*RESTAPIResponse*/ response) {

    var helper = new x_snd_eb.RestHelper('incident_guides'); // the API name of the Unifi Process
    processAttachment(helper.getRequest().getRecord());
    helper.processRequest(request, response, 'POST'); // the HTTP method of the resource

    /**
     * This scripted REST API allows an attachment to be sent into Unifi in a
     * similar way to the OOB api/now/attachment REST API, but it processes it
     * in Unifi.
     *
     */
    function processAttachment(target_record) {
        var file_name = request.queryParams.file_name;
        var reference = request.queryParams.reference;
        var mime_type = request.getHeader('Content-Type');

        if (!file_name || !reference || !mime_type) return;

        var ga = new GlideSysAttachment();

        // save the body to an attachment on the request
        var attachment_id = ga.writeContentStream(target_record, file_name, mime_type, request.body.dataStream);

        // return custom payload for the body to process
        helper._getRequestBody = function _getRequestBody() {
            return '{\n' +
                '"message":    { "name": "AddAttachment" },\n' +
                '"reference":  "' + reference + '",\n' +
                '"attachment": "<x-attachment-data sys_id="' + attachment_id + '" />"\n' +
                '}';
        };
    }

})(request, response);