Function authentication

sdk/src/auth/composable.ts:39–213

(mode: AuthenticationMode = 'cookie', config: Partial<AuthenticationConfig> = {})

 * @returns A Directus authentication client.
 */
export const authentication = (mode: AuthenticationMode = 'cookie', config: Partial<AuthenticationConfig> = {}) => {
	return <Schema>(client: DirectusClient<Schema>): AuthenticationClient<Schema> => {
		const authConfig = { ...defaultConfigValues, ...config };
		let refreshPromise: Promise<AuthenticationData> | null = null;
		let refreshTimeout: ReturnType<typeof setTimeout> | null = null;
		const storage = authConfig.storage ?? memoryStorage();

		const resetStorage = async () =>
			storage.set({ access_token: null, refresh_token: null, expires: null, expires_at: null });

		const activeRefresh = async () => {
			try {
				await refreshPromise;
			} finally {
				refreshPromise = null;
			}
		};

		const refreshIfExpired = async () => {
			const authData = await storage.get();

			if (refreshPromise || !authData?.expires_at) {
				return activeRefresh();
			}

			if (authData.expires_at < new Date().getTime() + authConfig.msRefreshBeforeExpires) {
				refresh().catch((_err) => {
					/* throw err; */
				});
			}

			return activeRefresh();
		};

		const setCredentials = async (data: AuthenticationData) => {
			const expires = data.expires ?? 0;
			data.expires_at = new Date().getTime() + expires;
			await storage.set(data);

			if (authConfig.autoRefresh && expires > authConfig.msRefreshBeforeExpires && expires < MAX_INT32) {
				if (refreshTimeout) clearTimeout(refreshTimeout);

				refreshTimeout = setTimeout(() => {
					refreshTimeout = null;

					refresh().catch((_err) => {
						/* throw err; */
					});
				}, expires - authConfig.msRefreshBeforeExpires);
			}
		};

		const refresh = async (options: Omit<RefreshOptions, 'refresh_token'> = {}) => {
			const awaitRefresh = async () => {
				const authData = await storage.get();

				const fetchOptions: RequestInit = {
					method: 'POST',