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