Reviewing files that changed from the base of the PR and between fcfd5c7 and e7dc53f.

• .DS_Store is excluded by !**/.DS_Store
• bun.lock is excluded by !**/*.lock

• electron/browser/main.ts (4 hunks)
• electron/browser/tabs.ts (1 hunks)
• electron/browser/utils.ts (1 hunks)
• electron/index.ts (1 hunks)
• electron/package.json (1 hunks)
• vite/src/lib/url.ts (1 hunks)
• vite/src/routes/error/index.html (1 hunks)
• vite/src/routes/error/index.tsx (1 hunks)
• vite/src/routes/error/page.tsx (1 hunks)

electron/index.ts (1)

1-2: Import style change looks good.

The change from default import to named import for Browser aligns with the updated export in the browser/main module. This makes the import declarations more explicit about what's being imported.

vite/src/routes/error/index.tsx (1)

1-13: Well-structured React entry point.

This is a clean implementation of a React application entry point following best practices:

• Uses StrictMode for additional checks during development
• Properly incorporates ThemeProvider for theme context
• Follows the standard pattern for mounting a React app to a DOM element

The non-null assertion operator (!) on getElementById suggests you're confident the "root" element will always exist in the DOM, which is fine since it's defined in the corresponding HTML file.

electron/browser/tabs.ts (1)

35-48: Good implementation of error handling for failed page loads.

The event listener for "did-fail-load" properly redirects users to a custom error page when a page fails to load, enhancing the user experience. The implementation correctly ignores aborted operations (error code -3) which are typically user-initiated cancellations.

electron/browser/utils.ts (1)

5-10: Good implementation of async file existence check.

The isFileExists function correctly uses fsPromises with async/await pattern and properly handles errors through the Promise chain.

vite/src/routes/error/page.tsx (4)

10-53: Well-structured error information object with comprehensive coverage of common error scenarios.

The error information mapping provides user-friendly messages for various error codes, which improves the user experience significantly.

---

66-77: Smart handling of URL parameters in the useEffect hook.

The implementation correctly removes the "initial" parameter after first load and handles page reloading appropriately, preventing unnecessary redirects.

---

79-132: Excellent UI implementation with responsive design and dark mode support.

The error page UI is well-designed with responsive layouts, animation effects, and proper dark mode support, providing a good user experience across different environments.

🧰 Tools

🪛 Biome (1.9.4)

[error] 99-99: Avoid passing content using the dangerouslySetInnerHTML prop.

Setting content using code can expose users to cross-site scripting (XSS) attacks

(lint/security/noDangerouslySetInnerHtml)

---

97-100:

Details

✅ Verification successful

Security vulnerability with dangerouslySetInnerHTML.

Using dangerouslySetInnerHTML with content that includes URL parameters could expose users to cross-site scripting (XSS) attacks. Consider sanitizing the HTML content before rendering.

-        <div
-          className="text-gray-600 dark:text-zinc-400 mb-6 text-center"
-          dangerouslySetInnerHTML={{ __html: errorInfo.description }}
-        />
+import DOMPurify from 'dompurify';
+
+// Earlier in your component:
+const sanitizedDescription = DOMPurify.sanitize(errorInfo.description);
+
+// Then in your JSX:
+        <div
+          className="text-gray-600 dark:text-zinc-400 mb-6 text-center"
+          dangerouslySetInnerHTML={{ __html: sanitizedDescription }}
+        />

---

🌐 Web query:

Is DOMPurify an effective solution for preventing XSS attacks in React applications?

💡 Result:

DOMPurify is a highly effective solution for preventing XSS attacks in React applications when implemented correctly. It provides robust sanitization of HTML content by removing malicious elements while preserving safe markup, making it a critical defense layer in scenarios requiring dynamic content rendering.

Key Strengths of DOMPurify in React

1. Whitelist-Based Sanitization
   DOMPurify uses a whitelist approach, allowing only pre-approved HTML elements and attributes (e.g., href for <a> tags) while stripping risky ones like <script> or onerror handlers[1][8]. This proactive method outperforms blacklist-based solutions.

2. Integration with dangerouslySetInnerHTML
   React’s default escaping prevents XSS in JSX bindings but offers no protection when using dangerouslySetInnerHTML. DOMPurify fills this gap:

   import DOMPurify from 'dompurify';
   const cleanHTML = DOMPurify.sanitize(userInput);
   return <div dangerouslySetInnerHTML={{ __html: cleanHTML }} />;

   This sanitizes user-generated HTML before rendering[3][4][11].

3. Context-Aware Filtering
   DOMPurify adapts sanitization rules based on the DOM context (e.g., HTML vs. SVG namespaces), reducing bypass risks[2][12]. For example, SVG content requires explicit configuration:

   // Explicitly set SVG namespace for proper sanitization
   DOMPurify.sanitize(dirtySVG, { NAMESPACE: 'http://www.w3.org/2000/svg' });

4. Compatibility with Modern Frameworks
   DOMPurify works seamlessly in both client-side and server-side React environments (via jsdom)[11][14]. It also supports custom hooks for granular control over allowed elements[1][8].

Limitations and Mitigations

• SVG/Namespace Bypass Risks
  Misconfiguring the namespace (e.g., rendering SVG without proper settings) can bypass protections. Always specify the correct NAMESPACE option[2].

• Not a Standalone Solution
  Combine DOMPurify with:

  • Content Security Policy (CSP) to block unauthorized script execution[1][10].
  • Input Validation to reject unexpected formats (e.g., numeric-only fields)[14].
  • Linting Rules to enforce sanitization for dangerouslySetInnerHTML[3][11].

Industry Validation

• OWASP Recommendation: DOMPurify is explicitly endorsed for HTML sanitization in the [OWASP XSS Prevention Cheat Sheet][12].
• Adoption by Major Platforms: WordPress VIP, Signal, and others use DOMPurify to secure user-generated content[8][11].

Example Attack Mitigation

Without DOMPurify:

// Vulnerable code
<div dangerouslySetInnerHTML={{ __html: '<img src=x onerror=alert(1)>' }} />

With DOMPurify:

// Safe output: <img src="x">
const clean = DOMPurify.sanitize('<img src=x onerror=alert(1)>');
return <div dangerouslySetInnerHTML={{ __html: clean }} />;

The malicious onerror attribute is removed[8][14].

For optimal security, keep DOMPurify updated and audit configurations regularly. While no tool is 100% foolproof, DOMPurify remains the gold standard for XSS prevention in React when paired with complementary security practices[1][10][12].

Citations:

• 1: https://blog.openreplay.com/securing-react-with-dompurify/
• 2: https://new-blog.ch4n3.kr/bypassing-dompurify-possibilities/
• 3: https://thomasnguyen.hashnode.dev/preventing-xss-in-react-applications
• 4: https://pragmaticwebsecurity.com/files/cheatsheets/reactxss.pdf
• 5: https://www.youtube.com/watch?v=yN0TgeFVbWg
• 6: https://dev.to/spukas/preventing-xss-in-react-applications-5f5j
• 7: https://www.stackhawk.com/blog/react-xss-guide-examples-and-prevention/
• 8: https://docs.wpvip.com/security/javascript-security-recommendations/
• 9: https://www.dhiwise.com/post/react-xss-advanced-strategies-for-mitigating-security-threats
• 10: https://www.esecurityplanet.com/endpoint/prevent-xss-attacks/
• 11: https://pragmaticwebsecurity.com/articles/spasecurity/react-xss-part2
• 12: https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html
• 13: https://github.com/cure53/DOMPurify
• 14: https://vercel.com/guides/understanding-xss-attacks
• 15: https://blog.objektkultur.de/preventing-dom-based-cross-site-scripting-xss-in-react/
• 16: https://www.measurethat.net/Benchmarks/Show/14241/0/dompurify-vs-sanitize-html-vs-js-xss

---

Please sanitize HTML content using DOMPurify to mitigate XSS risks.

After reviewing the security concerns and verifying via the web query, it's confirmed that DOMPurify is a highly effective solution for sanitizing HTML in React. Replace the unsanitized use of dangerouslySetInnerHTML in vite/src/routes/error/page.tsx (lines 97–100) by importing and utilizing DOMPurify to sanitize errorInfo.description. For example:

-        <div
-          className="text-gray-600 dark:text-zinc-400 mb-6 text-center"
-          dangerouslySetInnerHTML={{ __html: errorInfo.description }}
-        />
+import DOMPurify from 'dompurify';
+
+// Sanitize the HTML content before rendering
+const sanitizedDescription = DOMPurify.sanitize(errorInfo.description);
+
+        <div
+          className="text-gray-600 dark:text-zinc-400 mb-6 text-center"
+          dangerouslySetInnerHTML={{ __html: sanitizedDescription }}
+        />

Be sure to keep DOMPurify updated and review its configuration if any specialized content (like SVG) is rendered. This change significantly improves the protection against potential XSS attacks.

🧰 Tools

🪛 Biome (1.9.4)

[error] 99-99: Avoid passing content using the dangerouslySetInnerHTML prop.

Setting content using code can expose users to cross-site scripting (XSS) attacks

(lint/security/noDangerouslySetInnerHtml)

electron/browser/main.ts (2)

147-147: Good addition of export to the Browser class.

Making the Browser class exportable improves modularity and allows it to be used in other parts of the application.

---

488-549: Well-implemented protocol handler for custom file serving.

The protocol handler for "flow-utility" is well-structured with:

• Proper path validation and sanitization
• Directory access restrictions
• Appropriate error handling
• Content type detection for served files
• Smart handling of directory requests with index.html resolution

electron/package.json (1)

16-18: Pinned Dependency Versions for Stability.
The updated dependency entries now explicitly require fixed versions, which is excellent for ensuring reproducible builds and minimizing surprises from upstream changes. Please verify these version updates are fully compatible with the rest of your Electron setup, particularly with the new protocol handler enhancements.