background.js

chrome.runtime.onMessage.addListener();

// triggering a reveal requires two network requests in succession
// the first is a problem/submit, the second is a graphql request
// which fetches the next suggested problems. If these requests happen
// within 15 seconds of each other, it's a solve
chrome.webRequest.onCompleted.addListener(
  ({ url }) => {
    chrome.storage.local.get(
      ['hidelcReveal', 'hidelcActive'],
      ({ hidelcReveal, hidelcActive }) => {
        // if the extension and feature are active
        if (hidelcReveal && hidelcActive) {
          if (
            url.includes('https://leetcode.com/problems/') &&
            url.includes('/submit/')
          ) {
            chrome.storage.local.set({ hidelcSubmitted: true });
            // disables the reveal if no graphql request is made in 15 seconds
            setTimeout(
              () => chrome.storage.local.set({ hidelcSubmitted: false }),
              1000 * 15,
            );
          } else if (url === 'https://leetcode.com/graphql') {
            chrome.storage.local.get(
              ['hidelcSubmitted'],
              ({ hidelcSubmitted }) => {
                // disables the reveal if no problem/submit request has been made in the last 15 seconds
                if (!hidelcSubmitted) return;
                chrome.tabs.query({ active: true }, tabs => {
                  chrome.tabs.sendMessage(tabs[0].id, {
                    hidelcRevealEvent: true,
                  });
                });
              },
            );
          }
        }
      },
    );
  },
  {
    urls: [
      'https://leetcode.com/graphql',
      'https://leetcode.com/problems/*/submit/',
    ],
  },
);