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import jwtDecode, { type JwtHeader, type JwtPayload } from 'jwt-decode';
import _ from 'lodash';
import { match } from 'ts-pattern';
import { ALGORITHM_DESCRIPTIONS, CLAIM_DESCRIPTIONS } from './jwt-parser.constants';
export { decodeJwt };
function decodeJwt({ jwt }: { jwt: string }) {
const rawHeader = jwtDecode<JwtHeader>(jwt, { header: true });
const rawPayload = jwtDecode<JwtPayload>(jwt);
const header = _.map(rawHeader, (value, claim) => parseClaims({ claim, value }));
const payload = _.map(rawPayload, (value, claim) => parseClaims({ claim, value }));
return {
header,
payload,
};
}
function parseClaims({ claim, value }: { claim: string; value: unknown }) {
const claimDescription = CLAIM_DESCRIPTIONS[claim];
const formattedValue = _.toString(value);
const friendlyValue = getFriendlyValue({ claim, value });
return {
value: formattedValue,
friendlyValue,
claim,
claimDescription,
};
}
function getFriendlyValue({ claim, value }: { claim: string; value: unknown }) {
return match(claim)
.with('exp', 'nbf', 'iat', () => dateFormatter(value))
.with('alg', () => (_.isString(value) ? ALGORITHM_DESCRIPTIONS[value] : undefined))
.otherwise(() => undefined);
}
const dateFormatter = (value: unknown) => {
if (_.isNil(value)) return undefined;
const date = new Date(Number(value) * 1000);
return `${date.toLocaleDateString()} ${date.toLocaleTimeString()}`;
};
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