feat: 認証実装

app/api/auth/[...nextauth]/route.ts

@@ -0,0 +1,4 @@
+import { handlers } from "@/lib/auth";
+
+export const runtime = "edge";
+export const { GET, POST } = handlers;

lib/auth.ts

@@ -0,0 +1,5 @@
+import NextAuth from "next-auth";
+import GitHub from "next-auth/providers/github";
+export const { handlers, auth, signIn, signOut } = NextAuth({
+	providers: [GitHub],
+});

middleware.ts

@@ -0,0 +1,14 @@
+import { auth } from "@/lib/auth";
+import { type NextRequest, NextResponse } from "next/server";
+
+export async function middleware(req: NextRequest) {
+	const session = await auth();
+	if (!session) {
+		return NextResponse.redirect(new URL("/api/auth/signin", req.url));
+	}
+	return NextResponse.next();
+}
+
+export const config = {
+	matcher: ["/((?!api|_next/static|_next/image|favicon.ico).*)"],
+};

package.json

@@ -22,6 +22,7 @@
 		"clsx": "^2.1.1",
 		"lucide-react": "^0.469.0",
 		"next": "15.1.2",
+		"next-auth": "^5.0.0-beta.25",
 		"react": "^19.0.0",
 		"react-dom": "^19.0.0",
 		"tailwind-merge": "^2.5.5",