feat(appcheck): Add new internal, default provider

FirebaseAppCheck/CHANGELOG.md

@@ -1,3 +1,8 @@
+# Unreleased
+- [changed] The default App Check provider is now automatically selected based
+  on the environment: the Debug provider is used on simulators, and the
+  DeviceCheck provider is used on devices.
+
 # 12.14.0
 - [added] Added `AppAttestProviderFactory` to simplify App Check setup when
   using the App Attest provider. (#16182)

FirebaseAppCheck/Sources/DefaultProviderFactory/FIRDefaultProviderFactory.h

@@ -0,0 +1,28 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckProviderFactory.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/// The internal default provider factory that is set at +load time. It returns
+/// the Debug provider for simulator builds; otherwise, the DeviceCheck
+/// provider.
+@interface FIRDefaultProviderFactory : NSObject <FIRAppCheckProviderFactory>
+
+@end
+
+NS_ASSUME_NONNULL_END

FirebaseAppCheck/Sources/DefaultProviderFactory/FIRDefaultProviderFactory.m

@@ -0,0 +1,37 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FirebaseAppCheck/Sources/DefaultProviderFactory/FIRDefaultProviderFactory.h"
+
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheck.h"
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckDebugProviderFactory.h"
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProviderFactory.h"
+
+@implementation FIRDefaultProviderFactory
+
++ (void)load {
+  [FIRAppCheck setAppCheckProviderFactory:[[self alloc] init]];
+}
+
+- (nullable id<FIRAppCheckProvider>)createProviderWithApp:(nonnull FIRApp *)app {
+  // TODO(ncooke3): What about for local dev targeting macOS?
+#if TARGET_OS_SIMULATOR
+  return [[[FIRAppCheckDebugProviderFactory alloc] init] createProviderWithApp:app];
+// TODO(ncooke3): Add elif case for future reCAPTCHA provider.
+#else
+  return [[[FIRDeviceCheckProviderFactory alloc] init] createProviderWithApp:app];
+#endif
+}
+
+@end

FirebaseAppCheck/Sources/DeviceCheckProvider/FIRDeviceCheckProviderFactory.m

@@ -16,15 +16,10 @@
 
 #import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProviderFactory.h"
 
-#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheck.h"
 #import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProvider.h"
 
 @implementation FIRDeviceCheckProviderFactory
 
-+ (void)load {
-  [FIRAppCheck setAppCheckProviderFactory:[[self alloc] init]];
-}
-
 - (nullable id<FIRAppCheckProvider>)createProviderWithApp:(nonnull FIRApp *)app {
   return [[FIRDeviceCheckProvider alloc] initWithApp:app];
 }

FirebaseAppCheck/Tests/Unit/DefaultProviderFactory/FIRDefaultProviderFactoryTests.m

@@ -0,0 +1,51 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <XCTest/XCTest.h>
+
+#import "FirebaseAppCheck/Sources/DefaultProviderFactory/FIRDefaultProviderFactory.h"
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckAvailability.h"
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckDebugProvider.h"
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProvider.h"
+
+#import "FirebaseCore/Extension/FirebaseCoreInternal.h"
+
+FIR_DEVICE_CHECK_PROVIDER_AVAILABILITY
+@interface FIRDefaultProviderFactoryTests : XCTestCase
+@end
+
+@implementation FIRDefaultProviderFactoryTests
+
+- (void)testCreateProviderWithApp {
+  FIROptions *options = [[FIROptions alloc] initWithGoogleAppID:@"app_id" GCMSenderID:@"sender_id"];
+  options.APIKey = @"api_key";
+  options.projectID = @"project_id";
+  FIRApp *app = [[FIRApp alloc] initInstanceWithName:@"testInitWithValidApp" options:options];
+  // The following disables automatic token refresh, which could interfere with tests.
+  app.dataCollectionDefaultEnabled = NO;
+
+  FIRDefaultProviderFactory *factory = [[FIRDefaultProviderFactory alloc] init];
+
+  id<FIRAppCheckProvider> provider = [factory createProviderWithApp:app];
+
+  XCTAssertNotNil(provider);
+
+#if TARGET_OS_SIMULATOR
+  XCTAssert([provider isKindOfClass:[FIRAppCheckDebugProvider class]]);
+#else
+  XCTAssert([provider isKindOfClass:[FIRDeviceCheckProvider class]]);
+#endif
+}
+
+@end

FirebaseAppCheck/Tests/Unit/DeviceCheckProvider/FIRDeviceCheckProviderFactoryTests.m

@@ -0,0 +1,44 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <XCTest/XCTest.h>
+
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRAppCheckAvailability.h"
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProvider.h"
+#import "FirebaseAppCheck/Sources/Public/FirebaseAppCheck/FIRDeviceCheckProviderFactory.h"
+
+#import "FirebaseCore/Extension/FirebaseCoreInternal.h"
+
+FIR_DEVICE_CHECK_PROVIDER_AVAILABILITY
+@interface FIRDeviceCheckProviderFactoryTests : XCTestCase
+@end
+
+@implementation FIRDeviceCheckProviderFactoryTests
+
+- (void)testCreateProviderWithApp {
+  FIROptions *options = [[FIROptions alloc] initWithGoogleAppID:@"app_id" GCMSenderID:@"sender_id"];
+  options.APIKey = @"api_key";
+  options.projectID = @"project_id";
+  FIRApp *app = [[FIRApp alloc] initInstanceWithName:@"testInitWithValidApp" options:options];
+  // The following disables automatic token refresh, which could interfere with tests.
+  app.dataCollectionDefaultEnabled = NO;
+
+  FIRDeviceCheckProviderFactory *factory = [[FIRDeviceCheckProviderFactory alloc] init];
+
+  FIRDeviceCheckProvider *createdProvider = [factory createProviderWithApp:app];
+
+  XCTAssert([createdProvider isKindOfClass:[FIRDeviceCheckProvider class]]);
+}
+
+@end