auth-app.js

GitHub App authentication for JavaScript

@octokit/auth-app implements authentication for GitHub Apps using JSON Web Token and installation access tokens.

For other GitHub authentication strategies see octokit/auth.js.

• Usage
• createAppAuth(options)
• auth(options)
• Authentication object
  • JSON Web Token (JWT) authentication
  • Installation access token authentication
  • OAuth access token authentication
• auth.hook(request, route, parameters) or auth.hook(request, options)
• Implementation details
• License

Usage

Browsers	Load @octokit/auth-app directly from cdn.skypack.dev <script type="module"> import { createAppAuth } from "https://cdn.skypack.dev/@octokit/auth-app"; </script>
Node	Install with npm install @octokit/auth-app const { createAppAuth } = require("@octokit/auth-app"); // or: import { createAppAuth } from "@octokit/auth-app";
⚠️ For usage in browsers: The private keys provided by GitHub are in PKCS#1 format, but the WebCrypto API only supports PKCS#8. You need to convert it first: openssl pkcs8 -topk8 -inform PEM -outform PEM -nocrypt -in private-key.pem -out private-key-pkcs8.key No conversation is needed in Node, both PKCS#1 and PKCS#8 format will work.

const auth = createAppAuth({
  appId: 1,
  privateKey: "-----BEGIN PRIVATE KEY-----\n...",
  installationId: 123,
  clientId: "1234567890abcdef1234",
  clientSecret: "1234567890abcdef12341234567890abcdef1234",
});

// Retrieve JSON Web Token (JWT) to authenticate as app
const appAuthentication = await auth({ type: "app" });
// resolves with
// {
//   type: 'app',
//   token: 'jsonwebtoken123',
//   appId: 123,
//   expiresAt: '2018-07-07T00:09:30.000Z'
// }

// Retrieve installation access token
const installationAuthentication = await auth({ type: "installation" });
// resolves with
// {
//   type: 'token',
//   tokenType: 'installation',
//   token: 'token123',
//   installationId: 123,
//   createdAt: '2018-07-07T00:00:00.000Z'
//   expiresAt: '2018-07-07T00:59:00.000Z'
// }

// Retrieve an oauth-access token
const oauthAuthentication = await auth({ type: "oauth", code: "123456" });
// resolves with
// {
//   type: 'token',
//   tokenType: 'oauth',
//   token: 'token123',
//   scopes: []
// }

createAppAuth(options)

name	type	description
appId	number	Required. Find App ID on the app’s about page in settings.
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.
installationId	number	Default installationId to be used when calling auth({ type: "installation" }).
clientId	string	The Client ID of the GitHub App.
clientSecret	string	The Client Secret of the GitHub App.
request	function	You can pass in your own @octokit/request instance. For usage with enterprise, set baseUrl to the hostname + /api/v3. Example: const { request } = require("@octokit/request"); createAppAuth({ appId: 1, privateKey: "-----BEGIN PRIVATE KEY-----\n...", request: request.defaults({ baseUrl: "https://ghe.my-company.com/api/v3", }), });
cache	object	Installation tokens expire after an hour. By default, @octokit/auth-app is caching up to 15000 tokens simultaneously using lru-cache. You can pass your own cache implementation by passing options.cache.{get,set} to the constructor. Example: const CACHE = {}; createAppAuth({ appId: 1, privateKey: "-----BEGIN PRIVATE KEY-----\n...", cache: { async get(key) { return CACHE[key]; }, async set(key, value) { CACHE[key] = value; }, }, });
log	object	You can pass in your preferred logging tool by passing option.log to the constructor. If you would like to make the log level configurable using an environment variable or external option, we recommend the console-log-level package. For example: createAppAuth({ appId: 1, privateKey: "-----BEGIN PRIVATE KEY-----\n...", log: require("console-log-level")({ level: "info" }), });

auth(options)

name	type	description
type	string	Required. Must be either "app", "installation", or "oauth".
installationId	number	Required if type is set to "installation" unless a default installationId was passed to createAppAuth(). ID of installation to retrieve authentication for.
repositoryIds	array of string	Only relevant if type is set to "installation". The `id`s of the repositories that the installation token can access.
permissions	object	Only relevant if type is set to "installation". The permissions granted to the access token. The permissions object includes the permission names and their access type. For a complete list of permissions and allowable values, see GitHub App permissions.
factory	function	Only relevant if `type` is set to `"installation"`. When the factory option is, the auth({type: "installation", installationId, factory }) call with resolve with whatever the factory function returns. The factory function will be called with all the strategy option that auth was created with, plus the additional options passed to auth, besides type and factory. For example, you can create a new auth instance for an installation which shares the internal state (especially the access token cache) with the calling auth instance: const appAuth = createAppAuth({ appId: 1, privateKey: "-----BEGIN PRIVATE KEY-----\n...", }); const installationAuth123 = await appAuth({ type: "installation", installationId: 123, factory: createAppAuth, });
refresh	boolean	Only relevant if type is set to "installation". Installation tokens expire after one hour. By default, tokens are cached and returned from cache until expired. To bypass and update a cached token for the given installationId, set refresh to true. Defaults to false.
code	string	Only relevant if type is set to "oauth". The authorization code which was passed as query parameter to the callback URL from the OAuth web application flow.
redirectUrl	string	Only relevant if type is set to "oauth". The URL in your application where users are sent after authorization. See redirect urls.
state	string	Only relevant if type is set to "oauth". The unguessable random string you provided in Step 1 of the OAuth web application flow.

Authentication object

There are three possible results

1. JSON Web Token (JWT) authentication
2. Installation access token authentication
3. OAuth access token authentication

JSON Web Token (JWT) authentication

name	type	description
type	string	"app"
token	string	The JSON Web Token (JWT) to authenticate as the app.
appId	number	GitHub App database ID.
expiresAt	string	Timestamp in UTC format, e.g. "2018-07-07T00:09:30.000Z". A Date object can be created using new Date(authentication.expiresAt).

Installation access token authentication

name	type	description
type	string	"token"
token	string	The installation access token.
tokenType	string	"installation"
installationId	number	Installation database ID.
createdAt	string	Timestamp in UTC format, e.g. "2018-07-07T00:00:00.000Z". A Date object can be created using new Date(authentication.expiresAt).
expiresAt	string	Timestamp in UTC format, e.g. "2018-07-07T00:59:00.000Z". A Date object can be created using new Date(authentication.expiresAt).
repositoryIds	array of numbers	Only present if repositoryIds option passed to auth(options).
permissions	object	An object where keys are the permission name and the value is either "read" or "write". See the list of all GitHub App Permissions.
singleFileName	string	If the single file permission is enabled, the singleFileName property is set to the path of the accessible file.

OAuth access token authentication

name	type	description
type	string	"token"
token	string	The personal access token
tokenType	string	"oauth"
scopes	array of strings	array of scope names enabled for the token

auth.hook(request, route, parameters) or auth.hook(request, options)

auth.hook() hooks directly into the request life cycle. It amends the request to authenticate either as app or as installation based on the request URL. It also automatically sets the "machine-man" preview which is currently required for all endpoints requiring JWT authentication.

The request option is an instance of @octokit/request. The arguments are the same as for the request() method.

auth.hook() can be called directly to send an authenticated request

const { data: installations } = await auth.hook(
  request,
  "GET /app/installations"
);

Or it can be passed as option to request().

const requestWithAuth = request.defaults({
  request: {
    hook: auth.hook,
  },
});

const { data: installations } = await requestWithAuth("GET /app/installations");

Note that auth.hook() does not create and set an OAuth authentication token. But you can use @octokit/auth-oauth-app for that functionality. And if you don't plan on sending requests to routes that require authentication with client_id and client_secret, you can just retrieve the token and then create a new instance of request() with the authentication header set:

const { token } = await auth({
  type: "oauth",
  code: "123456",
});
const requestWithAuth = request.defaults({
  headers: {
    authentication: `token ${token}`,
  },
});

Implementation details

When creating a JSON Web Token, it sets the "issued at time" (iat) to 30s in the past as we have seen people running situations where the GitHub API claimed the iat would be in future. It turned out the clocks on the different machine were not in sync.

Installation access tokens are valid for 60 minutes. This library invalidates them after 59 minutes to account for request delays.

License

MIT