Chapter 15 - implement authentication

app/ui/dashboard/sidenav.tsx

@@ -2,6 +2,7 @@ import Link from 'next/link';
 import NavLinks from '@/app/ui/dashboard/nav-links';
 import AcmeLogo from '@/app/ui/acme-logo';
 import { PowerIcon } from '@heroicons/react/24/outline';
+import { signOut } from '@/auth';
 
 export default function SideNav() {
   return (
@@ -17,7 +18,10 @@ export default function SideNav() {
       <div className="flex grow flex-row justify-between space-x-2 md:flex-col md:space-x-0 md:space-y-2">
         <NavLinks />
         <div className="hidden h-auto w-full grow rounded-md bg-gray-50 md:block"></div>
-        <form>
+        <form action={async () => {
+            'use server';
+            await signOut();
+        }}>
           <button className="flex h-[48px] w-full grow items-center justify-center gap-2 rounded-md bg-gray-50 p-3 text-sm font-medium hover:bg-sky-100 hover:text-blue-600 md:flex-none md:justify-start md:p-2 md:px-3">
             <PowerIcon className="w-6" />
             <div className="hidden md:block">Sign Out</div>