@e280/authlocal/x/trust/concepts/token/tokentime.js

User-sovereign login system for everybody

import { decodeToken } from "./decode.js";
export const tokentime = {
    /** convert jtw seconds to js milliseconds */
    toMs: (t) => t * 1000,
    /** convert js milliseconds to jwt seconds */
    at: (ms) => ms / 1000,
    /** convert js milliseconds to jwt seconds, or undefined */
    maybe: (ms) => ms !== undefined
        ? ms / 1000
        : undefined,
    /** read token expiry time in js milliseconds */
    readExpiresAt(token) {
        const { exp } = decodeToken(token).payload;
        return exp === undefined
            ? undefined
            : tokentime.toMs(exp);
    },
    /** read token issued time in js milliseconds */
    readIssuedAt(token) {
        const { iat } = decodeToken(token).payload;
        return iat === undefined
            ? undefined
            : tokentime.toMs(iat);
    },
    /** return true if the jwt is expired */
    isExpired(token, time = Date.now()) {
        const expiresAt = this.readExpiresAt(token);
        return expiresAt === undefined
            ? false
            : time >= expiresAt;
    },
    /** obscure a timestamp using some randomness */
    fuzz({ time, randomness, additive }) {
        const resolution = randomness / 10;
        const bucketed = Math.floor(additive
            ? Math.ceil(time / resolution) * resolution
            : Math.floor(time / resolution) * resolution);
        const offset = Math.floor(Math.random() * randomness);
        return additive
            ? bucketed + offset
            : bucketed - offset;
    },
};
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