fix: decode production admin session cookie

src/lib/proxy-access.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { shouldRedirectAdminRequest } from "./proxy-access";
+import { shouldRedirectAdminRequest, usesSecureAuthCookie } from "./proxy-access";
 
 describe("shouldRedirectAdminRequest", () => {
   it("redirects anonymous admin requests before rendering", () => {
@@ -12,3 +12,10 @@ describe("shouldRedirectAdminRequest", () => {
     expect(shouldRedirectAdminRequest("/news", null)).toBe(false);
   });
 });
+
+describe("usesSecureAuthCookie", () => {
+  it("matches Auth.js production cookie naming", () => {
+    expect(usesSecureAuthCookie("production")).toBe(true);
+    expect(usesSecureAuthCookie("development")).toBe(false);
+  });
+});

src/lib/proxy-access.ts

@@ -2,6 +2,10 @@ export interface ProxyToken {
   rank?: unknown;
 }
 
+export function usesSecureAuthCookie(environment: string | undefined): boolean {
+  return environment === "production";
+}
+
 export function shouldRedirectAdminRequest(pathname: string, token: ProxyToken | null): boolean {
   if (pathname !== "/admin" && !pathname.startsWith("/admin/")) return false;
   return token === null;

src/proxy.ts

@@ -1,6 +1,6 @@
 import { type NextRequest, NextResponse } from "next/server";
 import { getToken } from "next-auth/jwt";
-import { shouldRedirectAdminRequest } from "@/lib/proxy-access";
+import { shouldRedirectAdminRequest, usesSecureAuthCookie } from "@/lib/proxy-access";
 
 // Edge proxy (formerly "middleware"): Prisma can't run here, so we only forward
 // the request path (so server components / the access guard can read it via
@@ -9,7 +9,9 @@ import { shouldRedirectAdminRequest } from "@/lib/proxy-access";
 export async function proxy(req: NextRequest) {
   if (req.nextUrl.pathname === "/admin" || req.nextUrl.pathname.startsWith("/admin/")) {
     const secret = process.env.AUTH_SECRET;
-    const token = secret ? await getToken({ req, secret }) : null;
+    const token = secret
+      ? await getToken({ req, secret, secureCookie: usesSecureAuthCookie(process.env.NODE_ENV) })
+      : null;
     if (shouldRedirectAdminRequest(req.nextUrl.pathname, token)) {
       return NextResponse.redirect(new URL("/login", req.url));
     }