From 043e2fe14a6f13885a552211f17d61292001fa76 Mon Sep 17 00:00:00 2001
From: evanbacon <bacon@expo.io>
Date: Tue, 15 Oct 2024 11:50:12 -0700
Subject: [PATCH] prevent fatal crashes when launching App Clips (#47000)

Summary:
App Clips are full of bugs. One such bug is how launching an App Clip from Test Flight (and perhaps other systems) will cause the user activity to be of type `NSUserActivityTypeBrowsingWeb` but with a nullish `userActivity.webpageURL` (even though it's typed as never being nullish in this mode).

## Changelog:

[IOS] [FIXED] - Fix launching App Clips with nullish URLs.

<!-- Help reviewers and the release process by writing your own changelog entry.

Pick one each for the category and type tags:

[ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message

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Pull Request resolved: https://github.com/facebook/react-native/pull/47000

Test Plan:
The following was failing cryptically and required extensive debugging to get launching.

https://github.com/user-attachments/assets/ffd26297-b20b-45a2-97cc-35a48b740cb2

Reviewed By: cipolleschi

Differential Revision: D64372170

Pulled By: lunaleaps

fbshipit-source-id: 388f05530f3bccdd9b446382931f127421bc8a27
---
 .../react-native/Libraries/LinkingIOS/RCTLinkingManager.mm     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/react-native/Libraries/LinkingIOS/RCTLinkingManager.mm b/packages/react-native/Libraries/LinkingIOS/RCTLinkingManager.mm
index 3fa06c43979bfd..ad75ed482c49f1 100644
--- a/packages/react-native/Libraries/LinkingIOS/RCTLinkingManager.mm
+++ b/packages/react-native/Libraries/LinkingIOS/RCTLinkingManager.mm
@@ -74,7 +74,8 @@ + (BOOL)application:(UIApplication *)application
     continueUserActivity:(NSUserActivity *)userActivity
       restorationHandler:(nonnull void (^)(NSArray<id<UIUserActivityRestoring>> *_Nullable))restorationHandler
 {
-  if ([userActivity.activityType isEqualToString:NSUserActivityTypeBrowsingWeb]) {
+  // This can be nullish when launching an App Clip.
+  if ([userActivity.activityType isEqualToString:NSUserActivityTypeBrowsingWeb] && userActivity.webpageURL != nil) {
     NSDictionary *payload = @{@"url" : userActivity.webpageURL.absoluteString};
     [[NSNotificationCenter defaultCenter] postNotificationName:kOpenURLNotification object:self userInfo:payload];
   }