CodeForces submissions scraper (JS)

codeforces-submissions-scraper.js

// Yoink all AC solution from the Standings page of codeforces, using JS to interact with the site
// Submissions are output as {contestantName}-{submissionId}.txt
/** HOW TO USE
 * 1. Go to standings page - https://codeforces.com/group/----/contest/----/standings
 * 2. Open JS console (three dots in top right -> [More Tools] -> [Developer Tools] -> [Console])
 * 3. Paste code snippet into JS console
 * 4. [ALLOW] multiple file downloads
 * 5. Hold [Enter] on your keyboard so the file is saved immediately once the prompt shows up (filename should be highlighted), there is likely to be many submissions
*/
(async function(){
    for(const node of [...document.querySelectorAll(".cell-accepted,.cell-passed-system-test")]){ // .slice(12,16)
        // console.log(node);
        const authorUsername = node.parentNode.parentNode.querySelector(".contestant-cell").innerText;
        node.parentNode.dispatchEvent(new MouseEvent("click", {
            ctrlKey: true
        }));
        const sources = await new Promise(res => {
            let int = setInterval(() => {
                if(document.getElementsByClassName("showSource").length > 0){
                    clearInterval(int);
                    res([...document.getElementsByClassName("showSource")]);
                }
            }, 100);
        });
        
        const submissionId = sources[sources.length-1].innerText;
        console.log(authorUsername, submissionId)
        sources[sources.length-1].click();
        const lines = await new Promise(res => {
            let int = setInterval(() => {
                const query = document.getElementsByTagName("code");
                if(query.length >= 2){
                    clearInterval(int);
                    res(query);
                }
            }, 100);
        });
        // console.log(lines[1].innerText);
        // console.log(lines[1].innerText.split('\r').slice(0,5).join('\r')); // consolelog code result to console
        
        (function(data, filename, type){ // https://stackoverflow.com/a/30832210
            var file = new Blob([data], {type: type});
            var a = document.createElement("a"),
                        url = URL.createObjectURL(file);
                a.href = url;
                a.download = filename;
                document.body.appendChild(a);
                a.click();
                setTimeout(function() {
                    document.body.removeChild(a);
                    window.URL.revokeObjectURL(url);  
                }, 0); 
        })(lines[1].innerText, `${authorUsername}-${submissionId}.txt`, "text/plain");
        
        document.getElementsByClassName("close")[0].click();
    }
})();

sad news, this dies on AC submitted during a freeze for frozen standings. it still works otherwise though!