Added middleware and session helper

src/app/sign-in/page.tsx

@@ -1,18 +1,15 @@
 import { OAuthSignInButton } from "@/components/auth/signin-button"
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
-import { auth } from "@/lib/auth/auth"
+import { getSession } from "@/lib/auth/session"
 import { LogIn } from "lucide-react"
-import { headers } from "next/headers"
-import { redirect } from "next/navigation"
 
 export default async function SignInPage() {
-    const session = await auth.api.getSession({
-        headers: await headers()
-    })
+    const { session, redirect } = await getSession()
 
     if (session) {
-        redirect("/")
+        redirect("/dashboard")
     }
+
     return (
         <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-slate-50 to-slate-100 dark:from-slate-900 dark:to-slate-800 p-4">
             <Card className="w-full max-w-md shadow-xl">

src/lib/auth/session.ts

@@ -0,0 +1,14 @@
+import { headers } from "next/headers"
+import { auth } from "./auth"
+import { redirect } from "next/navigation"
+
+export async function getSession() {
+    const session = await auth.api.getSession({
+        headers: await headers()
+    })
+    const redirectFunc = (path: string) => {
+        redirect(path)
+    }
+
+    return { session, redirect: redirectFunc }
+}

src/middleware.ts

@@ -0,0 +1,20 @@
+import { NextRequest, NextResponse } from "next/server"
+import { auth } from "./lib/auth/auth"
+
+export async function middleware(request: NextRequest) {
+    const { nextUrl, headers, url } = request
+
+    if (nextUrl.pathname.startsWith('/dashboard')) {
+        const session = await auth.api.getSession({
+            headers: headers
+        })
+
+        if (!session) {
+            return NextResponse.redirect(new URL('/sign-in', url))
+        }
+    }
+
+    return NextResponse.next()
+}
+
+export const config = { matcher: ['/dashboard/:path*'] }