feat (login page): add a sign in / log in page

middleware.ts

@@ -0,0 +1,28 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getToken } from "next-auth/jwt";
+
+const protectedPaths = ["/dashboard", "/finances", "/instagram", "/tiktok", "/twitch", "/youtube"];
+
+export async function middleware(req: NextRequest) {
+    const { pathname } = req.nextUrl;
+    const isProtected = protectedPaths.some((p) => pathname.startsWith(p));
+
+    const token = await getToken({ req, secret: process.env.AUTH_SECRET });
+
+    if (isProtected && !token) {
+        const loginUrl = new URL("/", req.url);
+        return NextResponse.redirect(loginUrl);
+    }
+
+    // Redirect already-authenticated users away from login page
+    if (pathname === "/" && token) {
+        const dashboardUrl = new URL("/dashboard", req.url);
+        return NextResponse.redirect(dashboardUrl);
+    }
+
+    return NextResponse.next();
+}
+
+export const config = {
+    matcher: ["/((?!api|_next/static|_next/image|favicon.ico).*)"],
+};