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Viewing file:     decode_protected_header.js (1.04 KB)      -rw-r--r--

import { decode as base64url } from './base64url.js';
import { decoder } from '../lib/buffer_utils.js';
import isObject from '../lib/is_object.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(base64url(protectedB64u)));
        if (!isObject(result)) {
            throw new Error();
        }
        return result;
    }
    catch {
        throw new TypeError('Invalid Token or Protected Header formatting');
    }
}