rate.ts

import { printLogLine } from "./utils.ts";

export async function checkTimeRateLimit(hashedIp: string, limitSeconds: number): Promise<boolean> {

    try {

        const cache = (caches as any)?.default;

        if (!cache) return true; 

        const cacheKey = `https://ratelimit.local/${hashedIp}`;

        const hit = await cache.match(cacheKey);

        if (hit) return false;

        await cache.put(cacheKey, new Response("1", {

            "headers": { "Cache-Control": `max-age=${limitSeconds}` }

        }));

        return true;

    } catch (_err) {

        printLogLine("ERROR", "Cache API failure.");

        return true; 

    }

}

export async function hashIP(ip: string, salt: string): Promise<string> {

    const msgBuffer = new TextEncoder().encode(ip + salt);

    const hashBuffer = await crypto.subtle.digest("SHA-256", msgBuffer);

    const hashArray = new Uint8Array(hashBuffer);
    
    let hexString = "";

    for (let i = 0; i < hashArray.length; i++) {

        const b = hashArray[i];

        hexString += ((b < 16) ? '0' : '') + b.toString(16);

    }

    return hexString;

}