Send a system notification when your friend solves a problem on codeforces.
// ==UserScript==
// @name CF notification
// @name:zh-CN CF notification
// @namespace https://github.com/platelett/script
// @version 0.2.2
// @description Send a system notification when your friend solves a problem on codeforces.
// @description:zh-CN 看看是谁在卷题
// @author platelet
// @match https://codeforces.com/problemset/status?friends=on
// @icon https://www.google.com/s2/favicons?sz=64&domain=codeforces.com
// @license MIT
// @source https://github.com/platelett/script/blob/main/CF%20notification.js
// @grant none
// ==/UserScript==
// Open the page https://codeforces.com/problemset/status?friends=on script takes effect.
(function() {
'use strict';
onload = () => {
const interval = 1000 * 12;
var parser = new DOMParser();
const query = async (url, path) => parser.parseFromString(await (await fetch(url)).text(), "text/html").querySelectorAll(path);
Notification.requestPermission(() => {
if(document.querySelector("#header > div.lang-chooser > div:nth-child(2) > a:nth-child(2)").textContent == "Register") {
alert("You are not logged in and cannot receive notifications.");
return;
}
var last = document.querySelector("#pageContent > div.datatable > div:nth-child(6) > table > tbody > tr > td.id-cell.dark.left > a").textContent;
var running = new Set();
var ID = setInterval(async () => {
try {
var now, result = [];
await (async () => {
for(var page = 1; page <= 5; page++) {
var list = await query("https://codeforces.com/problemset/status/page/" + page + "?friends=on",
"#pageContent > div.datatable > div:nth-child(6) > table > tbody > tr:not(.first-row)");
if(!list.length) throw "Invalid page";
if(page == 1) now = list[0].children[0].textContent.trim();
for(var submission of list) {
var info = [];
for(var i of submission.children) {
if(i.children[0]) i = i.children[0];
info.push(i.textContent.trim());
}
if(info[0] <= last && (!running.size || info[0] < Math.min.apply(null, [...running]))) return;
var visited = info[0] <= last;
if(running.has(info[0])) running.delete(info[0]), visited = false;
if(visited) continue;
if(info[5] == "Accepted" || info[5] == "Happy New Year!" ||
info[5].startsWith("Pretests passed") || info[5].startsWith("Perfect result")) {
var parts = info[3].split(" ");
result.push({
title: info[2] + " has solved " + parts[0],
user: info[2],
problem: submission.children[3].children[0].href,
name: parts[0].slice(parts[0].match(/[A-Z]/).index) + ". " + parts.slice(2).join("")
});
}
if(info[5] == "In queue" || info[5].startsWith("Running on test")) running.add(info[0]);
}
}
running.clear();
})();
last = now;
var all = [];
for(var i of result) all.push(new Promise(async resolve => {
var tmp = i;
for(var node of await query(tmp.problem, "span.tag-box")) {
var tag = node.textContent.trim();
if(tag[0] == '*') tmp.title += " (" + parseInt(tag.slice(1)) + ")";
}
tmp.title += ".", resolve();
}));
await Promise.all(all);
while(result.length) {
var i = result.pop();
if(!i.duplicate) new Notification(i.title, { body: i.name }).onclick
= () => window.open(i.problem, '_blank');
}
} catch(err) {
new Notification("Error happened! Please check the console.");
console.log(err), clearInterval(ID);
}
}, interval);
});
}
})();