export function getBaseURL()

in packages/better-auth/src/utils/url.ts [24:61]

• 33 lines of code
• 15 McCabe index (conditional complexity)

export function getBaseURL(url?: string, path?: string, request?: Request) {
	if (url) {
		return withPath(url, path);
	}

	const fromEnv =
		env.BETTER_AUTH_URL ||
		env.NEXT_PUBLIC_BETTER_AUTH_URL ||
		env.PUBLIC_BETTER_AUTH_URL ||
		env.NUXT_PUBLIC_BETTER_AUTH_URL ||
		env.NUXT_PUBLIC_AUTH_URL ||
		(env.BASE_URL !== "/" ? env.BASE_URL : undefined);

	if (fromEnv) {
		return withPath(fromEnv, path);
	}

	const fromRequest = request?.headers.get("x-forwarded-host");
	const fromRequestProto = request?.headers.get("x-forwarded-proto");
	if (fromRequest && fromRequestProto) {
		return withPath(`${fromRequestProto}://${fromRequest}`, path);
	}

	if (request) {
		const url = getOrigin(request.url);
		if (!url) {
			throw new BetterAuthError(
				"Could not get origin from request. Please provide a valid base URL.",
			);
		}
		return withPath(url, path);
	}

	if (typeof window !== "undefined" && window.location) {
		return withPath(window.location.origin, path);
	}
	return undefined;
}