@aikidosec/firewall/agent/Hostnames.js

Zen by Aikido is an embedded Application Firewall that autonomously protects Node.js apps against common and critical attacks, provides rate limiting, detects malicious traffic (including bots), and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Hostnames = void 0;
class Hostnames {
    constructor(maxEntries = 200) {
        this.maxEntries = maxEntries;
        this.map = new Map();
    }
    add(hostname, port) {
        if (port <= 0) {
            return;
        }
        if (!this.map.has(hostname)) {
            this.map.set(hostname, new Map([[port, 1]]));
        }
        else {
            const ports = this.map.get(hostname);
            if (!ports.has(port)) {
                ports.set(port, 1);
            }
            else {
                ports.set(port, ports.get(port) + 1);
            }
        }
        if (this.length > this.maxEntries) {
            const firstAdded = this.map.keys().next().value;
            if (firstAdded) {
                const ports = this.map.get(firstAdded);
                if (ports.size > 1) {
                    const firstPort = ports.keys().next().value;
                    if (firstPort) {
                        ports.delete(firstPort);
                    }
                }
                else {
                    this.map.delete(firstAdded);
                }
            }
        }
    }
    get length() {
        return Array.from(this.map.values()).reduce((total, ports) => total + ports.size, 0);
    }
    asArray() {
        return Array.from(this.map.entries()).flatMap(([hostname, ports]) => Array.from(ports.entries()).map(([port, hits]) => {
            return {
                hostname,
                port,
                hits,
            };
        }));
    }
    clear() {
        this.map.clear();
    }
}
exports.Hostnames = Hostnames;