fix: use canonical Auth.js session in proxy

src/lib/proxy-access.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { authSessionCookieName, shouldRedirectAdminRequest } from "./proxy-access";
+import { shouldRedirectAdminRequest } from "./proxy-access";
 
 describe("shouldRedirectAdminRequest", () => {
   it("redirects anonymous admin requests before rendering", () => {
@@ -12,18 +12,3 @@ describe("shouldRedirectAdminRequest", () => {
     expect(shouldRedirectAdminRequest("/news", null)).toBe(false);
   });
 });
-
-describe("authSessionCookieName", () => {
-  it("detects secure and unprefixed Auth.js cookies from the request", () => {
-    expect(authSessionCookieName(["__Secure-authjs.session-token"])).toBe("__Secure-authjs.session-token");
-    expect(authSessionCookieName(["authjs.session-token"])).toBe("authjs.session-token");
-  });
-
-  it("detects a chunked production session cookie", () => {
-    expect(authSessionCookieName(["__Secure-authjs.session-token.0", "__Secure-authjs.session-token.1"])).toBe("__Secure-authjs.session-token");
-  });
-
-  it("returns null when no session cookie exists", () => {
-    expect(authSessionCookieName(["theme"])).toBeNull();
-  });
-});

src/lib/proxy-access.ts

@@ -2,15 +2,6 @@ export interface ProxyToken {
   rank?: unknown;
 }
 
-const AUTH_COOKIE_NAMES = ["__Secure-authjs.session-token", "authjs.session-token"] as const;
-
-export function authSessionCookieName(cookieNames: readonly string[]): string | null {
-  for (const base of AUTH_COOKIE_NAMES) {
-    if (cookieNames.some((name) => name === base || name.startsWith(`${base}.`))) return base;
-  }
-  return null;
-}
-
 export function shouldRedirectAdminRequest(pathname: string, token: ProxyToken | null): boolean {
   if (pathname !== "/admin" && !pathname.startsWith("/admin/")) return false;
   return token === null;