cobalt/src/modules/processing/services/reddit.js

import { maxVideoDuration } from "../../config.js";

export default async function(obj) {
    let data = await fetch(`https://www.reddit.com/r/${obj.sub}/comments/${obj.id}/${obj.name}.json`).then((r) => { return r.json() }).catch(() => { return false });
    if (!data) return { error: 'ErrorCouldntFetch' };

    data = data[0]["data"]["children"][0]["data"];

    if (data.url.endsWith('.gif')) return { typeId: 1, urls: data.url };

    if (!("reddit_video" in data["secure_media"])) return { error: 'ErrorEmptyDownload' };
    if (data["secure_media"]["reddit_video"]["duration"] * 1000 > maxVideoDuration) return { error: ['ErrorLengthLimit', maxVideoDuration / 60000] };

    let audio = false,
        video = data["secure_media"]["reddit_video"]["fallback_url"].split('?')[0],
        audioFileLink = video.match('.mp4') ? `${video.split('_')[0]}_audio.mp4` : `${data["secure_media"]["reddit_video"]["fallback_url"].split('DASH')[0]}audio`;

    await fetch(audioFileLink, { method: "HEAD" }).then((r) => { if (Number(r.status) === 200) audio = true }).catch(() => { audio = false });

    // fallback for videos with differentiating audio quality
    if (!audio) {
        audioFileLink = `${video.split('_')[0]}_AUDIO_128.mp4`
        await fetch(audioFileLink, { method: "HEAD" }).then((r) => { if (Number(r.status) === 200) audio = true }).catch(() => { audio = false });
    }

    let id = video.split('/')[3];

    if (!audio) return { typeId: 1, urls: video };
    return {
        typeId: 2,
        type: "render",
        urls: [video, audioFileLink],
        audioFilename: `reddit_${id}_audio`,
        filename: `reddit_${id}.mp4`
    };
}