55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
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'use strict';
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class Jwk {
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#kid; // Key ID
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#value; // PEM-encoded public key
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#expirationTime; // Expiration time in milliseconds
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#createdAt; // UNIX timestamp of object construction
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constructor(kid, value, expirationTime = Infinity) {
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if(!kid) {
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throw new Error("JWK must have a non-empty kid.")
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}
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if(!value) {
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throw new Error("JWK must have a non-empty value.")
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}
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if(expirationTime < 0) {
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throw new Error("JWK must have an expiration time (ms) > 0.")
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}
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this.#kid = kid;
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this.#value = value;
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this.#expirationTime = expirationTime;
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this.#createdAt = Date.now();
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}
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get kid() {return this.#kid;}
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get value() {return this.#value;}
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get expirationTime() {return this.#expirationTime;}
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get createdAt() {return this.#createdAt;}
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/** Calculates the remaining time until the entry is discarded.
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* @returns time from until expiration or 0 if already expired
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*/
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get remainingTime() {
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const elapsedTime = Date.now() - this.createdAt;
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return Math.max(0, this.#expirationTime - elapsedTime);
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}
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// Checks if the entry is expired.
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get expired() {
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return this.remainingTime <= 0;
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}
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/** Checks if the Jwk is considered stale given the refresh period. Stale Jwks should be refreshed but may still be used until expiration.
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* @param refreshPeriod time period (in ms) before expiration time in which the Jwk should count as stale (but not yet as expired)
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* @returns true if the JWK is already expired or will expire within the given refresh period.
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*/
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stale(refreshPeriod) {
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return this.expired || this.remainingTime < refreshPeriod;
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}
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}
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module.exports = Jwk;
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