KeyCloak

OAuth 2.0 provider for KeyCloak.

Also see the OAuth 2.0 with PKCE guide.

Initialization

The realm URL should not include trailing slashes.

import { KeyCloak } from "arctic";

const realmURL = "https://auth.example.com/realms/myrealm";
const keycloak = new KeyCloak(realmURL, clientId, clientSecret, redirectURI);

Create authorization URL

import { generateState, generateCodeVerifier } from "arctic";

const state = generateState();
const codeVerifier = generateCodeVerifier();
const scopes = ["openid", "profile"];
const url = keycloak.createAuthorizationURL(state, codeVerifier, scopes);

Validate authorization code

validateAuthorizationCode() will either return an OAuth2Tokens, or throw one of OAuth2RequestError, ArcticFetchError, or a standard Error (parse errors). Actual values returned by KeyCloak depends on your configuration and version.

import { OAuth2RequestError, ArcticFetchError } from "arctic";

try {
	const tokens = await keycloak.validateAuthorizationCode(code, codeVerifier);
	const accessToken = tokens.accessToken();
	const accessTokenExpiresAt = tokens.accessTokenExpiresAt();
	const refreshToken = tokens.refreshToken();
} catch (e) {
	if (e instanceof OAuth2RequestError) {
		// Invalid authorization code, credentials, or redirect URI
		const code = e.code;
		// ...
	}
	if (e instanceof ArcticFetchError) {
		// Failed to call `fetch()`
		const cause = e.cause;
		// ...
	}
	// Parse error
}

The refresh token expiration is returned as refresh_expires_in.

const tokens = await keycloak.validateAuthorizationCode(code);
if ("refresh_expires_in" in tokens.data && typeof tokens.data.refresh_expires_in === "number") {
	const refreshTokenExpiresIn = tokens.data.refresh_expires_in;
}

OpenID Connect

Use OpenID Connect with the openid scope to get the user's profile with an ID token or the userinfo endpoint. Arctic provides decodeIdToken() for decoding the token's payload.

const scopes = ["openid"];
const url = keycloak.createAuthorizationURL(state, codeVerifier, scopes);

import { decodeIdToken } from "arctic";

const tokens = await keycloak.validateAuthorizationCode(code, codeVerifier);
const idToken = tokens.idToken();
const claims = decodeIdToken(idToken);

Refresh access tokens

Use refreshAccessToken() to get a new access token using a refresh token. This method also returns OAuth2Tokens and throws the same errors as validateAuthorizationCode().

import { OAuth2RequestError, ArcticFetchError } from "arctic";

try {
	const tokens = await keycloak.refreshAccessToken(accessToken);
} catch (e) {
	if (e instanceof OAuth2RequestError) {
		// Invalid authorization code, credentials, or redirect URI
	}
	if (e instanceof ArcticFetchError) {
		// Failed to call `fetch()`
	}
	// Parse error
}

Revoke tokens

Use revokeToken() to revoke a token. This can throw the same errors as validateAuthorizationCode().

try {
	await keycloak.revokeToken(token);
} catch (e) {
	if (e instanceof OAuth2RequestError) {
		// Invalid authorization code, credentials, or redirect URI
	}
	if (e instanceof ArcticFetchError) {
		// Failed to call `fetch()`
	}
	// Parse error
}