Add File Content In The Email

This script is used for creating an email that has file cabinet file content in the email body. when the user clicks a button in the sales order the mail should send to the particular user.

//User Event Script
/**
 * @NApiVersion 2.x
 * @NScriptType UserEventScript
 */
/*************************************************************************************************************************
 * CLIENTNAME:PRQ
 * PRQ
 * 
 * **********************************************************************************************************************
 * Date :1/05/2020
 *
 * Author: Jobin & Jismi IT Services LLP
 * Script Description : Script for creating Button
 * Date created : 1/05/2020
 *
 * REVISION HISTORY
 *
 * Revision 1.0 ${10/03/2020} Abin: created
 *
 **************************************************************************************************************************/
define(['N/record'], function (record){
function beforeLoad(context){

        try{
            if(context.type == 'view'){
                    context.form.addButton({
                    
                    id: "custpage_jj_aq_303_test_button",
                    label: "Button",
                    functionName : "onButtonClick"

                });
            }
            context.form.clientScriptModulePath = "SuiteScripts/script CS PRQ.js"

        }
        catch(e){
            log.debug('catchError',e)
        }
    }
    return{

        beforeLoad: beforeLoad
    };
    
});

//client script button action portion
    function onButtonClick(){
       var rec=currentRecord.get()
        var soid= rec.id

        var currenturl = url.resolveScript({
        scriptId: "customscript1964",
        deploymentId: "customdeploy1",
        returnExternalUrl: false
       })
             window.open (currenturl + "&soid=" + soid)
    }

/**
 * @NApiVersion 2.1
 * @NScriptType Suitelet
 */

define(['N/ui/serverWidget'],
    function(serverWidget) {
        function onRequest(context) {
            try{
                //sale order id from client script
                var soid = context.request.parameters.soid
                var objRec=record.load({
                   type: record.Type.SALES_ORDER,
                    id: soid,
                    isDynamic: true  
                 })
              //customer name
              var customer= objRec.getText({
                     fieldId:'entity'
                 })
                 //customer phone
                 var phone =objRec.getText({
                     fieldId:'custbody1'
                 })
                 //load File
                var fileObj = file.load({
                    id: 35319
                });
                //edit HTML
                 html_value=fileObj.getContents();
                log.debug("html_value",html_value)
                //replace  html
                html_value = html_value.replace('<!--name-->',customer);
                html_value = html_value.replace('<!--Phone-->',phone);
        
               var senderId = 39956; //empolyee id  (sample data)
                var recipientId = "name@jobinandjismi.com"; //empolyee email(sender)
        
                email.send({
                author: senderId,
                recipients: recipientId,
                subject: 'Test Sample Email Module',
                body: " " +html_value,
            });
            }
            catch(e){
                log.debug("error@mail",e)
            }
        }
    return {
            onRequest: onRequest
        };
    });