SponsorBlock/utils.js

// Function that can be used to wait for a condition before returning
async function wait(condition, timeout = 5000, check = 100) { 
    return await new Promise((resolve, reject) => {
        setTimeout(() => reject("TIMEOUT"), timeout);

        let intervalCheck = () => {
            let result = condition();
            if (result !== false) {
                resolve(result);
                clearInterval(interval);
            };
        };

        let interval = setInterval(intervalCheck, check);
        
        //run the check once first, this speeds it up a lot
        intervalCheck();
    });
}

function getYouTubeVideoID(url) {
    //Attempt to parse url
    let urlObject = null;
    try { 
            urlObject = new URL(url);
    } catch (e) {      
            console.error("[SB] Unable to parse URL: " + url);
            return false;
    }

    //Check if valid hostname
    if(!["www.youtube.com","www.youtube-nocookie.com"].includes(urlObject.host)) return false; 

    //Get ID from searchParam
    if ((urlObject.pathname == "/watch" || urlObject.pathname == "/watch/") && urlObject.searchParams.has("v")) {
        id = urlObject.searchParams.get("v"); 
        return id.length == 11 ? id : false;
    } else if (urlObject.pathname.startsWith("/embed/")) {
        try {
            return urlObject.pathname.substr(7, 11);
        } catch (e) {
            console.error("[SB] Video ID not valid for " + url);
            return false;
        }
    }

    return false;
}