Make tokenDelegate nullable in GACAppCheck

AppCheckCore/Sources/Core/GACAppCheck.m

@@ -48,7 +48,7 @@ @interface GACAppCheck ()
 @property(nonatomic, readonly) id<GACAppCheckProvider> appCheckProvider;
 @property(nonatomic, readonly) id<GACAppCheckStorageProtocol> storage;
 @property(nonatomic, readonly) id<GACAppCheckSettingsProtocol> settings;
-@property(nonatomic, readonly, weak) id<GACAppCheckTokenDelegate> tokenDelegate;
+@property(nonatomic, readonly, nullable, weak) id<GACAppCheckTokenDelegate> tokenDelegate;
 
 @property(nonatomic, readonly, nullable) id<GACAppCheckTokenRefresherProtocol> tokenRefresher;
 
@@ -65,7 +65,7 @@ - (instancetype)initWithInstanceName:(NSString *)instanceName
                              storage:(id<GACAppCheckStorageProtocol>)storage
                       tokenRefresher:(id<GACAppCheckTokenRefresherProtocol>)tokenRefresher
                             settings:(id<GACAppCheckSettingsProtocol>)settings
-                       tokenDelegate:(id<GACAppCheckTokenDelegate>)tokenDelegate {
+                       tokenDelegate:(nullable id<GACAppCheckTokenDelegate>)tokenDelegate {
   self = [super init];
   if (self) {
     _instanceName = instanceName;
@@ -89,8 +89,8 @@ - (instancetype)initWithInstanceName:(NSString *)instanceName
 - (instancetype)initWithInstanceName:(NSString *)instanceName
                     appCheckProvider:(id<GACAppCheckProvider>)appCheckProvider
                             settings:(id<GACAppCheckSettingsProtocol>)settings
-                       tokenDelegate:(id<GACAppCheckTokenDelegate>)tokenDelegate
                         resourceName:(NSString *)resourceName
+                       tokenDelegate:(nullable id<GACAppCheckTokenDelegate>)tokenDelegate
                  keychainAccessGroup:(nullable NSString *)accessGroup {
   GACAppCheckTokenRefreshResult *refreshResult =
       [[GACAppCheckTokenRefreshResult alloc] initWithStatusNever];
@@ -204,7 +204,9 @@ - (void)getLimitedUseTokenWithCompletion:(GACAppCheckTokenHandlerInterop)handler
             initWithStatusSuccessAndExpirationDate:token.expirationDate
                                     receivedAtDate:token.receivedAtDate];
         [self.tokenRefresher updateWithRefreshResult:refreshResult];
-        [self.tokenDelegate tokenDidUpdate:token instanceName:self.instanceName];
+        if (self.tokenDelegate) {
+          [self.tokenDelegate tokenDidUpdate:token instanceName:self.instanceName];
+        }
         return token;
       });
 }

AppCheckCore/Sources/Public/AppCheckCore/GACAppCheck.h

@@ -32,13 +32,19 @@ NS_SWIFT_NAME(AppCheckCore)
 - (instancetype)init NS_UNAVAILABLE;
 
 /// Returns an instance of `AppCheck` for an application.
-/// @param appCheckProvider  An `AppCheckCoreProvider` instance that provides App Check tokens.
-/// @return An instance of `AppCheckCore` corresponding to the provided `app`.
+/// @param appCheckProvider  An object that provides App Check tokens.
+/// @param settings An object that provides App Check settings.
+/// @param resourceName The name of the resource protected by App Check; for a Firebase App this is
+/// "projects/{project_id}/apps/{app_id}".
+/// @param tokenDelegate A delegate that receives token update notifications.
+/// @param accessGroup The identifier for a keychain group that the app shares items with; if
+/// provided, requires the Keychain Access Groups Entitlement.
+/// @return An instance of `AppCheckCore` with the specified token provider.
 - (instancetype)initWithInstanceName:(NSString *)instanceName
                     appCheckProvider:(id<GACAppCheckProvider>)appCheckProvider
                             settings:(id<GACAppCheckSettingsProtocol>)settings
-                       tokenDelegate:(id<GACAppCheckTokenDelegate>)tokenDelegate
                         resourceName:(NSString *)resourceName
+                       tokenDelegate:(nullable id<GACAppCheckTokenDelegate>)tokenDelegate
                  keychainAccessGroup:(nullable NSString *)accessGroup;
 
 @end

AppCheckCore/Tests/Unit/Core/GACAppCheckTests.m

@@ -48,7 +48,7 @@ - (instancetype)initWithInstanceName:(NSString *)instanceName
                              storage:(id<GACAppCheckStorageProtocol>)storage
                       tokenRefresher:(id<GACAppCheckTokenRefresherProtocol>)tokenRefresher
                             settings:(id<GACAppCheckSettingsProtocol>)settings
-                       tokenDelegate:(id<GACAppCheckTokenDelegate>)tokenDelegate;
+                       tokenDelegate:(nullable id<GACAppCheckTokenDelegate>)tokenDelegate;
 
 @end
 
@@ -147,8 +147,8 @@ - (void)testAppCheckInit {
   GACAppCheck *appCheck = [[GACAppCheck alloc] initWithInstanceName:kAppName
                                                    appCheckProvider:mockProvider
                                                            settings:mockSettings
-                                                      tokenDelegate:mockTokenDelegate
                                                        resourceName:kResourceName
+                                                      tokenDelegate:mockTokenDelegate
                                                 keychainAccessGroup:kAppGroupID];
   XCTAssert([appCheck isKindOfClass:[GACAppCheck class]]);
 

AppCheckCore/Tests/Unit/Swift/AppCheckAPITests.swift

@@ -55,8 +55,8 @@ final class AppCheckAPITests {
       instanceName: app.name,
       appCheckProvider: DummyAppCheckProvider(),
       settings: DummyAppCheckSettings(),
-      tokenDelegate: DummyAppCheckTokenDelegate(),
       resourceName: resourceName,
+      tokenDelegate: DummyAppCheckTokenDelegate(),
       keychainAccessGroup: app.options.appGroupID
     )