unleash-server/dist/lib/middleware/conditional-middleware.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

/**
 * @deprecated Use `requireFeatureEnabled` for feature-flag route gating.
 *
 * Generic conditional middleware runner.
 * Prefer this only for non-feature-flag conditions.
 */
export const conditionalMiddleware = (condition, middleware) => {
    return (req, res, next) => {
        if (condition()) {
            middleware(req, res, next);
        }
        else {
            next();
        }
    };
};
/**
 * Route-level feature gate middleware.
 *
 * Recommended usage:
 * `middleware: [requireFeatureEnabled(config.flagResolver, 'myFlag')]`
 *
 * Guidance:
 * - Prefer route-level usage (`this.route({ middleware: [...] })`) in controllers.
 * - Avoid broad prefix mounts (for example `/api/admin/projects`) where sibling routes
 *   can accidentally be gated.
 * - The route remains registered/discoverable; disabled features return `404` at request time.
 */
export const requireFeatureEnabled = (flagResolver, flagName) => {
    return (_req, res, next) => {
        if (flagResolver.isEnabled(flagName)) {
            return next();
        }
        return res.sendStatus(404);
    };
};
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