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6491ad4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | import { decode as b64u } from './base64url.js';
import { decoder } from '../lib/buffer_utils.js';
import { isObject } from '../lib/type_checks.js';
export function decodeProtectedHeader(token) {
let protectedB64u;
if (typeof token === 'string') {
const parts = token.split('.');
if (parts.length === 3 || parts.length === 5) {
;
[protectedB64u] = parts;
}
}
else if (typeof token === 'object' && token) {
if ('protected' in token) {
protectedB64u = token.protected;
}
else {
throw new TypeError('Token does not contain a Protected Header');
}
}
try {
if (typeof protectedB64u !== 'string' || !protectedB64u) {
throw new Error();
}
const result = JSON.parse(decoder.decode(b64u(protectedB64u)));
if (!isObject(result)) {
throw new Error();
}
return result;
}
catch {
throw new TypeError('Invalid Token or Protected Header formatting');
}
}
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