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import { browser } from "$app/environment";
// PRF key cache
const PRF_KEY = "prfKey";
const PRF_EXPIRES_KEY = "prfKeyExpiresAt";
export const defaultRememberForMs = 30 * 24 * 60 * 60 * 1000;
function hexFromBuffer(buf: ArrayBuffer): string {
return Array.from(new Uint8Array(buf))
.map((b) => b.toString(16).padStart(2, "0"))
.join("");
}
function bufferFromHex(hex: string): ArrayBuffer {
const bytes = new Uint8Array(hex.length / 2);
for (let i = 0; i < hex.length; i += 2) bytes[i / 2] = parseInt(hex.slice(i, i + 2), 16);
return bytes.buffer;
}
export const rememberPrfKey = (key: ArrayBuffer, durationMs: number) => {
if (!browser) return;
const expiresAt = Date.now() + durationMs;
localStorage.setItem(PRF_KEY, hexFromBuffer(key));
localStorage.setItem(PRF_EXPIRES_KEY, String(expiresAt));
};
export const getCachedPrfKey = (): ArrayBuffer | null => {
if (!browser) return null;
const hex = localStorage.getItem(PRF_KEY);
if (!hex) return null;
const expiresAtRaw = localStorage.getItem(PRF_EXPIRES_KEY);
const expiresAt = expiresAtRaw ? Number(expiresAtRaw) : 0;
if (expiresAt && Date.now() > expiresAt) {
forgetPrfKey();
return null;
}
return bufferFromHex(hex);
};
export const forgetPrfKey = () => {
if (!browser) return;
localStorage.removeItem(PRF_KEY);
localStorage.removeItem(PRF_EXPIRES_KEY);
};
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