[PUI] Fix global login (#6287)

* Global login PUI -> CUI
Fixes #6285

* ensure session is always set

* Check if user is already logged in CUI->PUI

* reduce diff

InvenTree/users/api.py

@@ -3,6 +3,7 @@
 import datetime
 import logging
 
+from django.contrib.auth import get_user, login
 from django.contrib.auth.models import Group, User
 from django.urls import include, path, re_path
 
@@ -242,6 +243,10 @@ class GetAuthToken(APIView):
                 "Created new API token for user '%s' (name='%s')", user.username, name
             )
 
+            # Ensure that the users session is logged in (PUI -> CUI login)
+            if not get_user(request).is_authenticated:
+                login(request, user)
+
             return Response(data)
 
         else:

src/frontend/src/functions/auth.tsx

@@ -120,7 +120,11 @@ export function handleReset(navigate: any, values: { email: string }) {
 /**
  * Check login state, and redirect the user as required
  */
-export function checkLoginState(navigate: any, redirect?: string) {
+export function checkLoginState(
+  navigate: any,
+  redirect?: string,
+  no_redirect?: boolean
+) {
   api
     .get(apiUrl(ApiPaths.user_token), {
       timeout: 2000,
@@ -144,6 +148,6 @@ export function checkLoginState(navigate: any, redirect?: string) {
       }
     })
     .catch(() => {
-      navigate('/login');
+      if (!no_redirect) navigate('/login');
     });
 }

src/frontend/src/pages/Auth/Login.tsx

@@ -2,12 +2,14 @@ import { t } from '@lingui/macro';
 import { Center, Container } from '@mantine/core';
 import { useToggle } from '@mantine/hooks';
 import { useEffect } from 'react';
+import { useNavigate } from 'react-router-dom';
 
 import { setApiDefaults } from '../../App';
 import { AuthFormOptions } from '../../components/forms/AuthFormOptions';
 import { AuthenticationForm } from '../../components/forms/AuthenticationForm';
 import { InstanceOptions } from '../../components/forms/InstanceOptions';
 import { defaultHostKey } from '../../defaults/defaultHostList';
+import { checkLoginState } from '../../functions/auth';
 import { useServerApiState } from '../../states/ApiState';
 import { useLocalState } from '../../states/LocalState';
 
@@ -24,6 +26,7 @@ export default function Login() {
   const hostname =
     hostList[hostKey] === undefined ? t`No selection` : hostList[hostKey]?.name;
   const [hostEdit, setHostEdit] = useToggle([false, true] as const);
+  const navigate = useNavigate();
 
   // Data manipulation functions
   function ChangeHost(newHost: string): void {
@@ -37,6 +40,9 @@ export default function Login() {
     if (hostKey === '') {
       ChangeHost(defaultHostKey);
     }
+
+    // check if user is logged in in PUI
+    checkLoginState(navigate, undefined, true);
   }, []);
   // Fetch server data on mount if no server data is present
   useEffect(() => {