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Minimal ChatGPT Message Logger + Injector + Submitter

Listen for postMessage from parent, log to console, enter it into the chat input, and submit

// ==UserScript==
// @name         Minimal ChatGPT Message Logger + Injector + Submitter
// @description  Listen for postMessage from parent, log to console, enter it into the chat input, and submit
// @match        https://chatgpt.com/*
// @version 0.0.1.20250516101032
// @namespace https://greasyfork.org/users/1435046
// ==/UserScript==

(function () {
  'use strict';

  window.addEventListener('message', function (event) {

    // Handle search button clicks
    if (event.data && event.data.type === 'searchButtonClicked') {
      const searchBtn = document.querySelector('[data-testid="composer-button-search"]');
      if (searchBtn) searchBtn.click();
      return;
    }

    if (event.data && event.data.type === 'reasonButtonClicked') {
      const reasonBtn = document.querySelector('[data-testid="composer-button-reason"]');
      if (reasonBtn) reasonBtn.click();
      return;
    }

    if (event.data && event.data.type === 'newChatButtonClicked') {
      // Click the "New chat" anchor link
      const newChatLink = document.querySelector('a[aria-label="New chat"][href="/"]');
      if (newChatLink) newChatLink.click();
      return;
    }

    if (event.data.type !== 'prompt') return;

    // Locate ProseMirror composer
    const composer = document.querySelector('.ProseMirror');
    if (!composer) return;

    console.log('Injecting message:', event.data.content);

    // Focus and inject the text
    composer.focus();

    const lines = event.data.content.split('\n');
    const html = lines
      .map(line => `<p>${line
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')}</p>`)
      .join('');
    composer.innerHTML = html;

    composer.dispatchEvent(new InputEvent('input', { bubbles: true }));

    // Observe DOM changes until the send button is enabled
    const observer = new MutationObserver(function (mutations, obs) {
      const sendBtn = document.querySelector('[data-testid="send-button"]');
      if (sendBtn && !sendBtn.disabled) {
        obs.disconnect();
        console.log('Submitting message');
        sendBtn.click();
      }
    });

    observer.observe(document, {
      childList: true,
      subtree: true,
      attributes: true,
      attributeFilter: ['disabled']
    });
  });
})();