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lib/session.ts

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+import { cookies } from 'next/headers';
+import { SignJWT, jwtVerify } from 'jose';
+
+const SESSION_COOKIE_NAME = 'auth_session';
+const SESSION_DURATION = 7 * 24 * 60 * 60 * 1000; // 7 Tage
+
+const secretKey = process.env.AUTH_SECRET || 'default-secret-change-in-production';
+const key = new TextEncoder().encode(secretKey);
+
+export interface SessionData {
+  username: string;
+  isAuthenticated: boolean;
+  expiresAt: number;
+}
+
+async function encrypt(payload: SessionData): Promise<string> {
+  return await new SignJWT(payload as unknown as Record<string, unknown>)
+    .setProtectedHeader({ alg: 'HS256' })
+    .setIssuedAt()
+    .setExpirationTime(new Date(payload.expiresAt))
+    .sign(key);
+}
+
+async function decrypt(token: string): Promise<SessionData | null> {
+  try {
+    const { payload } = await jwtVerify(token, key, {
+      algorithms: ['HS256'],
+    });
+    return {
+      username: payload.username as string,
+      isAuthenticated: payload.isAuthenticated as boolean,
+      expiresAt: payload.expiresAt as number,
+    };
+  } catch {
+    return null;
+  }
+}
+
+export async function createSession(username: string): Promise<void> {
+  const expiresAt = Date.now() + SESSION_DURATION;
+  const session: SessionData = { username, isAuthenticated: true, expiresAt };
+  const encryptedSession = await encrypt(session);
+  const cookieStore = await cookies();
+  cookieStore.set(SESSION_COOKIE_NAME, encryptedSession, {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === 'production',
+    expires: expiresAt,
+    sameSite: 'lax',
+    path: '/',
+  });
+}
+
+export async function getSession(): Promise<SessionData | null> {
+  const cookieStore = await cookies();
+  const cookie = cookieStore.get(SESSION_COOKIE_NAME);
+  if (!cookie?.value) return null;
+  const session = await decrypt(cookie.value);
+  if (!session || session.expiresAt < Date.now()) return null;
+  return session;
+}
+
+export async function deleteSession(): Promise<void> {
+  const cookieStore = await cookies();
+  cookieStore.delete(SESSION_COOKIE_NAME);
+}
+
+export async function isAuthenticated(): Promise<boolean> {
+  const session = await getSession();
+  return session?.isAuthenticated ?? false;
+}