☰

CF notification

Send a system notification when your friend solves a problem on codeforces.

  1. // ==UserScript==
  2. // @name         CF notification
  3. // @name:zh-CN   CF notification
  4. // @namespace    https://github.com/platelett/script
  5. // @version      0.2.2
  6. // @description  Send a system notification when your friend solves a problem on codeforces.
  7. // @description:zh-CN 看看是谁在卷题
  8. // @author       platelet
  9. // @match        https://codeforces.com/problemset/status?friends=on
  10. // @icon         https://www.google.com/s2/favicons?sz=64&domain=codeforces.com
  11. // @license      MIT
  12. // @source       https://github.com/platelett/script/blob/main/CF%20notification.js
  13. // @grant        none
  14. // ==/UserScript==
  15.  
  16. // Open the page https://codeforces.com/problemset/status?friends=on script takes effect.
  17.  
  18. (function() {
  19.     'use strict';
  20.     onload = () => {
  21.         const interval = 1000 * 12;
  22.         var parser = new DOMParser();
  23.         const query = async (url, path) => parser.parseFromString(await (await fetch(url)).text(), "text/html").querySelectorAll(path);
  24.         Notification.requestPermission(() => {
  25.             if(document.querySelector("#header > div.lang-chooser > div:nth-child(2) > a:nth-child(2)").textContent == "Register") {
  26.                 alert("You are not logged in and cannot receive notifications.");
  27.                 return;
  28.             }
  29.             var last = document.querySelector("#pageContent > div.datatable > div:nth-child(6) > table > tbody > tr > td.id-cell.dark.left > a").textContent;
  30.             var running = new Set();
  31.             var ID = setInterval(async () => {
  32.                 try {
  33.                     var now, result = [];
  34.                     await (async () => {
  35.                         for(var page = 1; page <= 5; page++) {
  36.                             var list = await query("https://codeforces.com/problemset/status/page/" + page + "?friends=on",
  37.                                 "#pageContent > div.datatable > div:nth-child(6) > table > tbody > tr:not(.first-row)");
  38.                             if(!list.length) throw "Invalid page";
  39.                             if(page == 1) now = list[0].children[0].textContent.trim();
  40.                             for(var submission of list) {
  41.                                 var info = [];
  42.                                 for(var i of submission.children) {
  43.                                     if(i.children[0]) i = i.children[0];
  44.                                     info.push(i.textContent.trim());
  45.                                 }
  46.                                 if(info[0] <= last && (!running.size || info[0] < Math.min.apply(null, [...running]))) return;
  47.                                 var visited = info[0] <= last;
  48.                                 if(running.has(info[0])) running.delete(info[0]), visited = false;
  49.                                 if(visited) continue;
  50.                                 if(info[5] == "Accepted" || info[5] == "Happy New Year!" ||
  51.                                 info[5].startsWith("Pretests passed") || info[5].startsWith("Perfect result")) {
  52.                                     var parts = info[3].split(" ");
  53.                                     result.push({
  54.                                         title: info[2] + " has solved " + parts[0],
  55.                                         user: info[2],
  56.                                         problem: submission.children[3].children[0].href,
  57.                                         name: parts[0].slice(parts[0].match(/[A-Z]/).index) + ". " + parts.slice(2).join("")
  58.                                     });
  59.                                 }
  60.                                 if(info[5] == "In queue" || info[5].startsWith("Running on test")) running.add(info[0]);
  61.                             }
  62.                         }
  63.                         running.clear();
  64.                     })();
  65.                     last = now;
  66.                     var all = [];
  67.                     for(var i of result) all.push(new Promise(async resolve => {
  68.                         var tmp = i;
  69.                         for(var node of await query(tmp.problem, "span.tag-box")) {
  70.                             var tag = node.textContent.trim();
  71.                             if(tag[0] == '*') tmp.title += " (" + parseInt(tag.slice(1)) + ")";
  72.                         }
  73.                         tmp.title += ".", resolve();
  74.                     }));
  75.                     await Promise.all(all);
  76.                     while(result.length) {
  77.                         var i = result.pop();
  78.                         if(!i.duplicate) new Notification(i.title, { body: i.name }).onclick
  79.                             = () => window.open(i.problem, '_blank');
  80.                     }
  81.                 } catch(err) {
  82.                     new Notification("Error happened! Please check the console.");
  83.                     console.log(err), clearInterval(ID);
  84.                 }
  85.             }, interval);
  86.         });
  87.     }
  88. })();