router now working, implemented login and logout

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/user.svelte.js

@@ -2,9 +2,29 @@ export const user = $state({
     name : null
 })
 
+export async function checkUser(){
+    var url = `${location.protocol}//${location.host.replace('5173','8080')}/api/user/whoami`;
+    let response = await fetch(url,{
+        credentials: 'include'
+    });
+    if (response.ok){
+        const json = await response.json();
+        for (var key of Object.keys(json)) user[key] = json[key];
+    }
+}
+
+export async function logout(){
+    var url = `${location.protocol}//${location.host.replace('5173','8080')}/api/user/logout`;
+    await fetch(url,{
+        credentials: 'include'
+    });
+    user.name = null;
+}
+
 export async function tryLogin(credentials){
     var url = `${location.protocol}//${location.host.replace('5173','8080')}/api/user/login`;
     let response = await fetch(url,{
+        credentials: 'include',
         headers: {
             'Content-Type':'application/json'
         },