63 lines
1.6 KiB
TypeScript
63 lines
1.6 KiB
TypeScript
/*
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* Copyright (C) Sapphirecode - All Rights Reserved
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* This file is part of Auth-Server-Helper which is released under MIT.
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* See file 'LICENSE' for full license details.
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* Created by Timo Hocker <timo@scode.ovh>, December 2020
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*/
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import { create_salt } from '@sapphirecode/crypto-helper';
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interface Key {
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key: string;
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valid_until: number;
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timeout: NodeJS.Timeout;
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}
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class KeyStore {
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private _keys: Record<string, Key> = {};
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private set_timeout (index: string, valid_for: number): NodeJS.Timeout {
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return setTimeout (() => {
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delete this._keys[index];
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}, (valid_for + 5) * 1000);
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}
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public get_key (iat: number, valid_for = 0): string {
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const index = Math.floor (iat / 60)
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.toFixed (0);
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const valid_until = (new Date)
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.getTime () + (valid_for * 1000);
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if (typeof this._keys[index] !== 'undefined') {
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const key = this._keys[index];
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if (valid_for !== 0 && key.valid_until < valid_until) {
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clearTimeout (key.timeout);
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key.timeout = this.set_timeout (index, valid_for);
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key.valid_until = valid_until;
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}
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return key.key;
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}
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if (valid_for !== 0) {
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if ((iat + 1) * 1000 < (new Date)
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.getTime ())
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throw new Error ('cannot create already expired keys');
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this._keys[index] = {
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key: create_salt (),
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timeout: this.set_timeout (index, valid_for),
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valid_until
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};
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return this._keys[index].key;
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}
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throw new Error ('key could not be found');
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}
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}
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const ks: KeyStore = (new KeyStore);
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export default ks;
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export { KeyStore };
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