cli utility to convert an aem service token into a jwt

ims-jwt.mjs

import { stdin, stdout, exit } from 'node:process';
import { parseArgs } from 'node:util';
import { default as auth } from '@adobe/jwt-auth';
import { default as fs } from 'fs';

const options = {
    'file': { type: 'string' },
};
const { values } = parseArgs({ options });

async function getAccessToken(json) {
    let creds = json.integration;
    const config = {
        clientId: creds.technicalAccount.clientId,
        clientSecret: creds.technicalAccount.clientSecret,
        technicalAccountId: creds.id,
        orgId: creds.org,
        metaScopes: [creds.metascopes],
        privateKey: creds.privateKey,
    };
    return auth(config).then((token) => token.access_token);
}

function getJson() {
    if (values.file) {
        return JSON.parse(fs.readFileSync(values.file, "utf-8"));
    } else {
        try {
            return JSON.parse(fs.readFileSync(stdin.fd, "utf-8"));
        } catch (e) {
            usage();
            exit(-1);
        }
    }
}

function usage() {
    console.log("Usage: jwt.mjs --file <file.json> | jwt.mjs < file.json");
}

try {
    const json = getJson();
    const token = await getAccessToken(json);
    stdout.isTTY ? console.log(token) : stdout.write(token);
} catch (e) {
    console.error(e);
    exit(-1)
}

requires node 18