Polar

OAuth 2.0 authorization code provider for Polar. Only supports confidential clients.

Also see OAuth 2.0 with PKCE.

Initialization

import * as arctic from "arctic";

const polar = new arctic.Polar(clientId, clientSecret, redirectURI);

Create authorization URL

import * as arctic from "arctic";

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

Validate authorization code

validateAuthorizationCode() will either return an OAuth2Tokens, or throw one of OAuth2RequestError, ArcticFetchError, UnexpectedResponseError, or UnexpectedErrorResponseBodyError. Polar returns an access token, its expiration, and a refresh token.

import * as arctic from "arctic";

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

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 = polar.createAuthorizationURL(state, codeVerifier, scopes);

import * as arctic from "arctic";

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

const response = await fetch("https://docs.polar.sh/api/v1/oauth2/userinfo", {
	headers: {
		Authorization: `Bearer ${accessToken}`
	}
});
const user = await response.json();

Get user profile

Make sure to add the profile scope to get the user profile and the email scope to get the user email.

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

Refresh tokens

Use refreshAccessToken() to get a new access token using a refresh token. This method's behavior is identical to validateAuthorizationCode().

import * as arctic from "arctic";

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

Revoke tokens

Revoke tokens with revokeToken(). This can throw the same errors as validateAuthorizationCode().

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