09. Deep Linking & Universal Links (iOS Associated Domains & Android App Links) • React Native: Cross-Platform Mobile Engineering • Rishabh Ki Kaksha

*   **Custom URL Schemes (`myapp://products/123`):** Simple but hijackable (koi bhi doosri malicious app same scheme register kar sakti hai!).
*   **Universal Links (iOS) & Android App Links (`https://myapp.com/products/123`):** Cryptographically verified domain ownership via `.well-known` configuration files!

---

### 2. Domain Verification Handshake Files

1. **iOS (`https://myapp.com/.well-known/apple-app-site-association`):**
```json
{
  "applinks": {
    "apps": [],
    "details": [
      {
        "appID": "TEAMID.com.boostengine.rishabhkaksha",
        "paths": ["/course/*", "/lesson/*"]
      }
    ]
  }
}
```

2. **Android (`https://myapp.com/.well-known/assetlinks.json`):**
```json
[{
  "relation": ["delegate_permission/common.handle_all_urls"],
  "target": {
    "namespace": "android_app",
    "package_name": "com.boostengine.rishabhkaksha",
    "sha256_cert_fingerprints": ["14:6D:E9:7D..."]
  }
}]
```

---

### 3. React Navigation Linking Configuration

```typescript
const linking = {
  prefixes: ["https://rishabhkikaksha.boostengine.in", "kaksha://"],
  config: {
    screens: {
      Home: "home",
      CourseDetail: "course/:courseId",
      LessonPlayer: "course/:courseId/lesson/:lessonId"
    }
  }
};
```

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### 4. Master Comparison Matrix

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### 5. Interview Ke 3 Sawal Is Topic Se

1. **Deferred Deep Linking kya hota hai?** -> Jab user ke phone me app install na ho, link click karne par App Store khulta hai; app install hone ke baad pehli baar open hote hi original target page redirect hota hai.
2. **Android `autoVerify="true"` intent-filter me kyu lagta hai?** -> OS app install ke waqt domain ke `assetlinks.json` ko verify karke app ko default handler banata hai bina disambiguation dialog popup ke.
3. **Cold Start vs Warm Start deep link handling me kya difference hai?** -> Cold start me `Linking.getInitialURL()` se initial URL fetch hota hai; Warm start (app running in background) me `Linking.addEventListener('url', ...)` event trigger hota hai.

---
**Next Topic:** 10. The Native Animation Thread: Animated API vs React Native Reanimated 3 Worklets

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Rishabh Gehlot

PHP 8+ & Laravel 11 Master Track