app_for_reddit/Reddit App/Utilities/RedditAuthChromeStyle.swift

import Foundation

enum RedditAuthChromeStyle {
    /// Hides Google sign-in on Reddit auth surfaces. Google OAuth does not work inside
    /// WKWebView subframes on macOS, so we remove the option instead of showing a broken flow.
    static let injectionScript = """
    (function() {
      if (window.__reddoraGoogleLoginHidden) return;
      window.__reddoraGoogleLoginHidden = true;

      const GOOGLE_PATTERNS = [
        /continue with google/i,
        /sign in with google/i,
        /sign in with google account/i
      ];
      const SELECTORS = 'button, a, [role="button"], faceplate-tracker, faceplate-button';

      function buttonLabel(node) {
        return (
          (node.textContent || '') + ' ' +
          (node.getAttribute('aria-label') || '') + ' ' +
          (node.getAttribute('title') || '')
        ).trim();
      }

      function isGoogleLoginButton(node) {
        return GOOGLE_PATTERNS.some(function(pattern) {
          return pattern.test(buttonLabel(node));
        });
      }

      function hideElement(node) {
        const target = node.closest('faceplate-tracker, faceplate-button') || node;
        target.style.setProperty('display', 'none', 'important');
        target.style.setProperty('visibility', 'hidden', 'important');
        target.setAttribute('aria-hidden', 'true');
        target.setAttribute('hidden', '');
      }

      function collectClickables(root, results) {
        if (!root) return;

        if (root.querySelectorAll) {
          root.querySelectorAll(SELECTORS).forEach(function(node) {
            results.push(node);
          });
        }

        const children = root.children || root.childNodes;
        for (let i = 0; i < children.length; i++) {
          const child = children[i];
          if (!(child instanceof Element)) continue;
          if (child.shadowRoot) {
            collectClickables(child.shadowRoot, results);
          }
          collectClickables(child, results);
        }
      }

      function hideGoogleLoginButtons(root) {
        const nodes = [];
        collectClickables(root || document.documentElement, nodes);

        for (let i = 0; i < nodes.length; i++) {
          const node = nodes[i];
          if (!isGoogleLoginButton(node)) continue;
          hideElement(node);
        }
      }

      document.addEventListener('click', function(event) {
        const path = event.composedPath ? event.composedPath() : [event.target];
        for (let i = 0; i < path.length; i++) {
          const node = path[i];
          if (!(node instanceof Element)) continue;
          if (!node.matches || !node.matches(SELECTORS)) continue;
          if (!isGoogleLoginButton(node)) continue;

          event.preventDefault();
          event.stopImmediatePropagation();
          return;
        }
      }, true);

      hideGoogleLoginButtons(document);

      const observer = new MutationObserver(function() {
        hideGoogleLoginButtons(document);
      });
      observer.observe(document.documentElement, { childList: true, subtree: true });

      [250, 750, 1500, 3000].forEach(function(delay) {
        setTimeout(function() {
          hideGoogleLoginButtons(document);
        }, delay);
      });
    })();
    """
}