@grace-js/grace/dist/esm/routes/middleware.js

An opinionated API framework

export function createBeforeRoute() {
    return (handler) => {
        return handler;
    };
}
export function createAfterRoute() {
    return (handler) => {
        return handler;
    };
}
export function rateLimitRoute({ windowMs, max, message, statusCode }) {
    const requests = new Map();
    return async ({ request, app }) => {
        const ip = app.adapter.getRequestIp(request);
        if (ip == null) {
            console.error('No IP address found in request, rate limiting is not possible');
            return;
        }
        if (!requests.has(ip)) {
            requests.set(ip, []);
        }
        const timestamps = requests.get(ip);
        const now = Date.now();
        // Remove timestamps older than the current window
        while (timestamps.length > 0 && now - timestamps[0] > windowMs) {
            timestamps.shift();
        }
        if (timestamps.length >= max) {
            return {
                code: statusCode ?? 429,
                body: {
                    message: message ?? 'Too many requests'
                }
            };
        }
        timestamps.push(now);
    };
}
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