fix usernames to be case insensitive when creating users and logging in

frontend/src/pages/Admin/Users/NewUserModal/index.jsx

@@ -15,7 +15,13 @@ export default function NewUserModal({ closeModal }) {
     for (var [key, value] of form.entries()) data[key] = value;
     const { user, error } = await Admin.newUser(data);
     if (!!user) window.location.reload();
-    setError(error);
+    if (
+      error.includes("Unique constraint failed on the fields: (`username`)")
+    ) {
+      setError("Username already in use. Please choose a different username.");
+    } else {
+      setError(error);
+    }
   };
 
   const user = userFromStorage();

server/endpoints/system.js

@@ -109,7 +109,9 @@ function systemEndpoints(app) {
 
       if (await SystemSettings.isMultiUserMode()) {
         const { username, password } = reqBody(request);
-        const existingUser = await User.get({ username: String(username) });
+        const existingUser = await User.get({
+          username: String(username.toLowerCase()),
+        });
 
         if (!existingUser) {
           await EventLogs.logEvent(

server/models/user.js

@@ -30,7 +30,7 @@ const User = {
       const hashedPassword = bcrypt.hashSync(password, 10);
       const user = await prisma.users.create({
         data: {
-          username,
+          username: username.toLowerCase(),
           password: hashedPassword,
           role,
         },