77 lines
2.8 KiB
JavaScript
77 lines
2.8 KiB
JavaScript
/* =====================================================================
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lib/auth.js — gemeinsame Session-Logik für die Zugangscode-Schranke (qciga/VanVan).
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1:1 portiert aus functions/_shared/auth.js — Node 22 hat crypto.subtle, btoa/atob global
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verfügbar (Web-Crypto-Standard), deshalb konnte die Logik praktisch unverändert übernommen
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werden. Einziger Unterschied: getCookie() liest jetzt aus Express' geparsten req.cookies statt
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selbst den Cookie-Header zu zerlegen (cookie-parser übernimmt das).
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===================================================================== */
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export const COOKIE_NAME = "vandiy_gate_session";
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export const ROLE_COOKIE_NAME = "vandiy_gate_role";
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export const SESSION_TAGE = 90;
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function b64urlEncode(bytes) {
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let bin = "";
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bytes.forEach((b) => (bin += String.fromCharCode(b)));
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return btoa(bin).replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/, "");
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}
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function b64urlDecodeToBytes(str) {
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str = str.replace(/-/g, "+").replace(/_/g, "/");
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while (str.length % 4) str += "=";
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const bin = atob(str);
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return Uint8Array.from(bin, (c) => c.charCodeAt(0));
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}
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async function hmacKey(secret) {
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return crypto.subtle.importKey(
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"raw",
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new TextEncoder().encode(secret),
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{ name: "HMAC", hash: "SHA-256" },
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false,
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["sign", "verify"]
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);
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}
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export async function signSession(role, secret) {
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const payload = JSON.stringify({ role, exp: Date.now() + SESSION_TAGE * 24 * 60 * 60 * 1000 });
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const payloadB64 = b64urlEncode(new TextEncoder().encode(payload));
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const key = await hmacKey(secret);
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const sig = await crypto.subtle.sign("HMAC", key, new TextEncoder().encode(payloadB64));
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const sigB64 = b64urlEncode(new Uint8Array(sig));
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return `${payloadB64}.${sigB64}`;
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}
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export async function verifySession(token, secret) {
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if (!token || !token.includes(".")) return null;
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const [payloadB64, sigB64] = token.split(".");
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try {
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const key = await hmacKey(secret);
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const valid = await crypto.subtle.verify(
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"HMAC",
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key,
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b64urlDecodeToBytes(sigB64),
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new TextEncoder().encode(payloadB64)
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);
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if (!valid) return null;
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const payload = JSON.parse(new TextDecoder().decode(b64urlDecodeToBytes(payloadB64)));
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if (!payload.exp || payload.exp < Date.now()) return null;
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return payload; // { role, exp }
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} catch {
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return null;
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}
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}
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/** Liefert die Rolle ("qciga"/"vanvan") bei gültiger Sitzung, sonst null. */
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export async function getGateRole(req) {
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if (!process.env.SITE_ACCESS_SECRET) return null;
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const token = req.cookies?.[COOKIE_NAME];
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const payload = token ? await verifySession(token, process.env.SITE_ACCESS_SECRET) : null;
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return payload?.role ?? null;
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}
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/** Standard-401-Antwort für API-Routen ohne gültige Sitzung. */
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export function unauthorizedJson(res) {
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return res.status(401).json({ ok: false, error: "Nicht angemeldet." });
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}
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