feat: Introduce user signup functionality with social login, authentication middleware, and updated login/home pages.

src/middleware.ts

@@ -0,0 +1,42 @@
+import { auth } from "@/auth";
+import { NextResponse } from "next/server";
+
+// Public routes that don't require authentication
+const publicRoutes = ["/login", "/signup", "/forgot-password", "/reset-password"];
+
+export default auth((req) => {
+  const { nextUrl } = req;
+  const isLoggedIn = !!req.auth;
+
+  const isPublicRoute = publicRoutes.some(
+    (route) => nextUrl.pathname === route || nextUrl.pathname.startsWith(route + "/")
+  );
+
+  const isApiRoute = nextUrl.pathname.startsWith("/api");
+  const isStaticRoute = nextUrl.pathname.startsWith("/_next") ||
+                        nextUrl.pathname.startsWith("/assets") ||
+                        nextUrl.pathname.includes(".");
+
+  // Skip middleware for API routes and static files
+  if (isApiRoute || isStaticRoute) {
+    return NextResponse.next();
+  }
+
+  // Redirect logged-in users away from public routes (login, signup)
+  if (isLoggedIn && isPublicRoute) {
+    return NextResponse.redirect(new URL("/", nextUrl.origin));
+  }
+
+  // Redirect non-logged-in users to login page for protected routes
+  if (!isLoggedIn && !isPublicRoute) {
+    const loginUrl = new URL("/login", nextUrl.origin);
+    loginUrl.searchParams.set("callbackUrl", nextUrl.pathname);
+    return NextResponse.redirect(loginUrl);
+  }
+
+  return NextResponse.next();
+});
+
+export const config = {
+  matcher: ["/((?!_next/static|_next/image|favicon.ico).*)"],
+};