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Creating an "allowed-users" list in Next.Js while implementing Google Auth

I am fairly new to Next and React, and I really don't know a whole lot about backend anything except very basic knowledge for how models and using the data works.
Ok, so far the method I have used is working. However, I went to the client side and the login.js file obviously showed the JSON file items in the allowed-users.json because I imported it and checked the array for the allowed users. The logic works and only the emails on the list can login with Google Auth.
This is not a major issue because the app idea I am coming up with is not supposed to be a site pushed to production with a lot of publicity, but I still would like to know something I could do to make this secure to learn.
I am open to any suggestions, or any correction on anything I am doing that is not good practice. I am here to learn. What I did in this code is just a test to get it to work, and the whole project is just to test out using the NextAuth with Google to give users permissions on the site to implement an Admin, Employee, Client system for the accounts.
My Code:
import React from "react";
import { useSession, signIn, signOut } from "next-auth/react";
import GoogleButton from "react-google-button";
import { useRouter } from "next/router";
import allowedUsers from "./api/allowed-users.json";
const Login = () => {
const { data: session } = useSession();
const router = useRouter();
console.log(session);
if (!session) {
return (
<div className="flex justify-center items-center content-center h-full">
<div>
<GoogleButton onClick={() => signIn()} />
</div>
</div>
);
}
if (session && allowedUsers.includes(session.user.email) ) {
router.push("/account");
} else {
const exitLogin = () => signOut();
exitLogin();
}
};
export default Login;
I have tried reading Next documentation on handling JSON and also API calls, but like I said, I am fairly new to this. I come from old school HTML / CSS / with simple JavaScript for simple sites. I am trying to broaden my knowledge to learn how to develop apps and sites that are viable nowadays.
If anyone has good documentation I should read please link it, or if you know a tutorial somewhere I can read through or watch that covers a topic similar to this.
Thanks!
Knight

Sending a String in Javascript to java method in Play Framework

I'm working on a system for my university and I'm using the play framework to do that.
The Admin of this system sets a marker on a google map and I get the coordinates from that point.
Now I'm trying to pass this information to the server side, so that I might store these to Strings in a mySQL database. The only problem I have is passing the data from my String in javascript/JQuery to the java function.
I tried different solutions on the internet but some of them seemed outdated and I couldn't figure out how to do it.
I've only been programming in Java, Javascript, JQuery and PHP and have never used AJAX (like the $.get() methode from JQuery), but I think it might be pretty similar to what I know from PHP.
e.g.
http://java.dzone.com/articles/jquery-ajax-play-2
I'd like to pass my String with a button click to my java function, so I can store it in my db.
I'm really confused about this.
I know I can use something like
<a href="{#routes.Application.postMethod()}"> Send </>
and then mention the function in the routes like
POST /post controllers.Application.post();
but how do I pass my qjuery string?
and how do I store my String as a String in a java function like:
public static Result post(String Lat, String Lng){
???????????? EVOLUTION NEEDED ?????
}
Thanks in advance I really need your help :)!

I don't see why you are doing a POST, since this can be done using a GET request.
As per this example:
http://www.playframework.com/documentation/1.2/ajax#jsaction
We can see Play makes it easier using the jsAction tag. Lets assume you have the following route:
GET /admins/marker Admins.marker
Then in your HTML, at the bottom you'd do something like:
<script type="text/javascript">
$('#myButton').click( function() {
var action = #{jsAction #marker(':latitude',':longitude') /}
$('#result').load(
action({latitude: '23', longitude: $('#longitudeField').val }),
function() {
$('#content').css('visibility', 'visible')
}
)
});
</script>
In this case, the request will be sent like (example):
GET /admins/marker?latitude=23&longitude=67
And then on your backend, you need the have to java fn to deal with that route.
Basically the javascript/jquery, is called when #myButton element is clicked, then we generate the route URL we are going to make a request to using jsAction, then we make using load to make a GET request. You can change this to post too if you'd like.

replacing Result's html

I have an URL which shows me a coupon form based on id:
GET /coupon/:couponId
All the coupon forms are different and submit different POST params to:
POST /saveCoupon/:id
I want to have a convenient way of debugging my coupons and be able to have a way of viewing actual POST params submitted.
I've made a controller on URL POST /outputPOST/saveCoupon/:id which saves nothing, but prints to browser POST params received.
Now I want to have an URL like GET /changeActionUrl/coupon/:couponId which calls GET /coupon/:couponId and then substitutes form's action URL POST /saveCoupon/:id with POST /outputPOST/saveCoupon/:id .
In other words I want to do something like:
Result.getHtml().replace("/saveCoupon/","/outputPOST/saveCoupon/");
With this I can easily debug my coupons just by adding "/outputPOST" in the browser.

You could just use a bookmarklet and javascript to replace all of the forms' action attributes. That way your developer can do it with one click instead of changing urls.
Something like this will prefix all form actions on the page with "/outputPOST".
javascript:(function(){var forms=document.getElementsByTagName('FORM');for(i=0;i<forms.length;++i){forms[i].setAttribute('action','/outputPOST'+forms[i].getAttribute('action'));}})();

I don't understand, at least not everything ;)
In general you can debug every piece of Play app using debugger (check for your favorite IDE tips how to do that) - this will be always better, faster, etc etc, than modifying code only for checking incoming values.
I.e. Idea 13+ with Play support allows for debbuging like a dream!

Java jface calling browser from an relative location

I have encountered a small problem that I need some help on. The issue is that I wish to call a browser window which calls a html page. The html file opens in 3 different browsers so the code for that should be correct. The actual problem is that it brings up a page can't be displayed error message
Here is the code that gets the location
package org.error;
public class BrowserLocation {
private String test1 = "org\\error\\PatientNumberError.html";
public BrowserLocation() {
}
public String patientNumberAddress() {
return test1;
}
}
and here is the code that creates the browser component and calls the location of the html file.
Browser browser = new Browser(container, SWT.NONE);
browser.setForeground(SWTResourceManager.getColor(SWT.COLOR_DARK_BLUE));
browser.setBackground(SWTResourceManager.getColor(SWT.COLOR_WHITE));
browser.setUrl(browserLocation.patientNumberAddress());
browser.setBounds(25, 25, 315, 180);
Would it be possible to find the error of my ways?

setUrl require a URL so you need something like:
browser.setUrl(new File(path).toURI().toURL().toString());

Sorry for not getting back to you earlier.
Someone that I know who is a senior Java programmer told me the problem that I was having was a case of absolute address versus relative address.
The reason for this is that if I was reading and writing to a file, then I would be able to use a relative address. However If I'm interacting with a server which is the case here as eventually It could go on-line (If I had the money) it would need to be an absolute address.
As I am still learning Java programming this was a very specific and important lesson to learn. I hope this would help anybody else who has had this issue.

what is the best way to display website visitors a one time welcome message?

I've got a website, and I want to add a welcoming message which hovers on a certain part of the page which only loads for the visitor for the first time they login, and won't again(presumably cookies used). And says something like "adjust your settings here.."
I don't want it to be an external popup but something that loads on the page in a certain area, defined by me (PX-pixle reference)
What would be the best coding language to do it in, oes anyone have any examples of this, or any site based generators to make it on?
thanks

Create one more field in database with lastlogin.
When user is created then make lastlogin field with special.
When user signs the next time from Login Page, update the field the lastlogin value to regular
//query to get value of lastlogin
//add css to elements you want to hover
<element class="<?php if($last-login == 'sepcial') { echo 'sepcialcss'; } else {echo 'regularcss'; }">
Done in PHP

As you added the tag, php would do this, actually any language will do.
Generally you have two ways to do this.
Do it on your server.
Do it on client's computer.
for the first way, you check the cookies and generate the page you want.
for the second way, you need to arrange the page the visitors see with java script.
way 1 recommended, coz it loads less bits. LOL
Update:
your server supports php right? the page, say it index.php, has a special area which is different when the visitors login the first time, right?
<?php
if (firstLogin()){
genSpecial();
}
else{
genRegular();
}
?>
in the funcition firstLogin(), you shall read the cookies and determine.
in the other two functions, just gen two different part, i.e. some html source code.
to your question, if you need to load some image, do it in genSpecial(). and if you choose the first way, js is not used to gen the special area, it's used only if in the special area, there needs some js.

It is possible through javascript. Once the user is shown the settings, store the result in a cookie valid for as long as you want. The next time the user logs in, verify if the cookie is set and then proceed.
Sample code to create cookies:
function setCookie(c_name,value,exdays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
document.cookie=c_name + "=" + c_value;
}
Refer this for more details on how to create and use cookies