lib/facebook.js

import got from "got";
import * as cheerio from "cheerio";
import { FacebookDlArgsSchema, FacebookDlSchema } from "../lib/types/facebook-v1.js";
import { DEFAULT_HEADERS } from "./constant.js";

async function facebookdl(url) {
    FacebookDlArgsSchema.parse(arguments);

    const html = await got("https://fdownloader.net/en", { headers: { ...DEFAULT_HEADERS } }).text();
    
    const k_url_search = /k_url_search="(.*?)"/.exec(html)?.[1] || null;
    const k_exp = /k_exp="(.*?)"/.exec(html)?.[1] || null;
    const k_token = /k_token="(.*?)"/.exec(html)?.[1] || null;

    if (!k_url_search || !k_exp || !k_token) {
        throw new Error("Failed to extract necessary tokens.");
    }

    const form = {
        k_exp,
        k_token,
        q: url,
        lang: "en",
        web: "fdownloader.net",
        v: "v2",
        w: "",
    };

    const data = await got.post(k_url_search, {
        headers: { ...DEFAULT_HEADERS, referer: "https://fdownloader.net/" },
        form,
    }).json();

    const $ = cheerio.load(data.data);

    const thumbnail = $(".thumbnail > .image-fb > img").attr("src") || null;
    const duration = $(".content > .clearfix > p").text() || null;
    
    const video = $("table.table").eq(0).find("tbody > tr").map((_, el) => {
        const $el = $(el);
        const quality = $el.find("td").eq(0).text().trim();
        const downloadUrl = $el.find("td").eq(2).find("a").attr("href");
        
        if (downloadUrl) {
            return { quality, download: () => Promise.resolve(downloadUrl) };
        }
    }).toArray().filter(Boolean);

    const audio = [];
    const audioUrl = $("#audioUrl").attr("value") || null;
    if (audioUrl) {
        audio.push({ quality: "128kbps", download: () => Promise.resolve(audioUrl) });
    }

    const result = { thumbnail, duration, video, audio };

    console.log(result);
    return FacebookDlSchema.parse(result);
}

async function convert(url, v_id, ftype, videoUrl, videoType, videoCodec, audioUrl, audioType, fquality, fname, exp, token) {
    return got.post(url, {
        form: { ftype, v_id, videoUrl, videoType, videoCodec, audioUrl, audioType, fquality, fname, exp, token, cv: "v2" },
    });
}

export { facebookdl, convert };