Package Exports

universal-github-app-jwt

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Readme

universal-github-app-jwt

Calculate GitHub App bearer tokens for Node & modern browsers

⚠ The private keys provide by GitHub are in PKCS#1 format, but the WebCrypto API only supports PKCS#8. You can see the difference in the first line, PKCS#1 format starts with -----BEGIN RSA PRIVATE KEY----- while PKCS#8 starts with -----BEGIN PRIVATE KEY-----. You can convert one format to the other using oppenssl:

openssl pkcs8 -topk8 -inform PEM -outform PEM -nocrypt -in private-key.pem -out private-key-pkcs8.key

It's also possible to convert the formats with JavaScript, e.g. using node-rsa, but it turns a 4kb to a 200kb+ built. I'm looking for help to create a minimal PKCS#1 to PKCS#8 convert library that I can recommend people to use before passing the private key to githubAppJwt. Please create an issue if you'd like to help.

The way it works with node-rsa is this

const PRIVATE_KEY = `-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----`;

const key = new NodeRSA(PRIVATE_KEY);
const privateKeyPkcs8 = key.exportKey("pkcs8-private-pem");

// privateKeyPkcs8 is now
// -----BEGIN PRIVATE KEY-----
// ...
// -----END PRIVATE KEY-----

When using a node, a conversion is not necessary, the implementation is agnostic to either format.

Usage

Browsers

Browsers	Load `universal-github-app-jwt` directly from cdn.pika.dev <script type="module"> import { githubAppJwt } from "https://cdn.pika.dev/universal-github-app-jwt"; </script>
Node	Install with `npm install universal-github-app-jwt` const { githubAppJwt } = require("universal-github-app-jwt"); // or: import { githubAppJwt } from "universal-github-app-jwt";

Load universal-github-app-jwt directly from cdn.pika.dev

<script type="module">
  import { githubAppJwt } from "https://cdn.pika.dev/universal-github-app-jwt";
</script>

Node

Install with npm install universal-github-app-jwt

const { githubAppJwt } = require("universal-github-app-jwt");
// or: import { githubAppJwt } from "universal-github-app-jwt";

(async () => {
  const { token, appId, expiration } = await githubAppJwt({
    id: APP_ID,
    privateKey: PRIVATE_KEY
  });
})();

The retrieved token can now be used in Authorization request header, e.g. with @octokit/request:

request("GET /app", {
  headers: {
    authorization: `bearer ${token}`
  }
});

For a complete implementation of GitHub App authentication strategies, see @octokit/auth-app.js.

`githubAppJwt(options)`

name	type	description
`options.id`	`number`	Required. Find App ID on the app’s about page in settings.
`options.privateKey`	`string`	Required. Content of the `*.pem` file you downloaded from the app’s about page. You can generate a new private key if needed. Make sure to preserve the line breaks.

githubAppJwt(options) resolves with an object with the following keys

name	type	description
`token`	`string`	The JSON Web Token (JWT) to authenticate as the app.
`appId`	`number`	The GitHub App database ID passed in `options.id`.
`expiration`	`number`	Timestamp as UNIX epoch, e.g. `1530922170`. A Date object can be created using `new Date(authentication.expiration)`.

License

MIT