feat: Sync to OSS repo

packages/auth/src/provider/arctic.ts

@@ -0,0 +1,66 @@
+import type { OAuth2Tokens } from 'arctic';
+import { Context } from 'hono';
+
+import { OauthError } from '../error.js';
+import { getRelativeUrl } from '../util.js';
+import { Provider } from './provider.js';
+
+export interface ArcticProviderOptions {
+	scopes: string[];
+	clientID: string;
+	clientSecret: string;
+	query?: Record<string, string>;
+}
+
+interface ProviderState {
+	state: string;
+}
+
+export function ArcticProvider(
+	provider: new (
+		clientID: string,
+		clientSecret: string,
+		callback: string
+	) => {
+		createAuthorizationURL(state: string, scopes: string[]): URL;
+		validateAuthorizationCode(code: string): Promise<OAuth2Tokens>;
+		refreshAccessToken(refreshToken: string): Promise<OAuth2Tokens>;
+	},
+	config: ArcticProviderOptions
+): Provider<{
+	tokenset: OAuth2Tokens;
+}> {
+	function getClient(c: Context) {
+		const callback = new URL(c.req.url);
+		const pathname = callback.pathname.replace(/authorize.*$/, 'callback');
+		const url = getRelativeUrl(c, pathname);
+		return new provider(config.clientID, config.clientSecret, url);
+	}
+	return {
+		type: 'arctic',
+		init(routes, ctx) {
+			routes.get('/authorize', async (c) => {
+				const client = getClient(c);
+				const state = crypto.randomUUID();
+				await ctx.set(c, 'provider', 60 * 10, {
+					state
+				});
+				return c.redirect(client.createAuthorizationURL(state, config.scopes));
+			});
+
+			routes.get('/callback', async (c) => {
+				const client = getClient(c);
+				const provider = (await ctx.get(c, 'provider')) as ProviderState;
+				if (!provider) return c.redirect('../authorize');
+				const code = c.req.query('code');
+				const state = c.req.query('state');
+				if (!code) throw new Error('Missing code');
+				if (state !== provider.state) throw new OauthError('invalid_request', 'Invalid state');
+				const tokens = await client.validateAuthorizationCode(code);
+				return ctx.success(c, {
+					tokenset: tokens
+				});
+			});
+		}
+	};
+}