Add Recaptcha App Check Provider stubs

Author: a-maurice

app_check/CMakeLists.txt

@@ -24,6 +24,7 @@ set(common_SRCS
   src/include/firebase/app_check/play_integrity_provider.h
   src/include/firebase/app_check/device_check_provider.h
   src/include/firebase/app_check/app_attest_provider.h
+  src/include/firebase/recaptcha_enterprise_provider.h
 )
 
 # Run gradle command to make jar
@@ -49,6 +50,8 @@ set(android_SRCS
   # Unsupported providers
   src/stub/app_attest_provider_stub.cc
   src/stub/device_check_provider_stub.cc
+  # TODO: Move when implemented
+  src/stub/recaptcha_enterprise_provider_stub.cc
 )
 
 # Source files used by the iOS implementation.
@@ -64,6 +67,8 @@ set(ios_SRCS
   src/ios/device_check_provider_ios.mm
   # Unsupported providers
   src/stub/play_integrity_provider_stub.cc
+  # TODO: Move when implemented
+  src/stub/recaptcha_enterprise_provider_stub.cc
 )
 
 # Flatbuffer resource files used by desktop
@@ -114,6 +119,7 @@ set(desktop_SRCS
   src/stub/app_attest_provider_stub.cc
   src/stub/device_check_provider_stub.cc
   src/stub/play_integrity_provider_stub.cc
+  src/stub/recaptcha_enterprise_provider_stub.cc
 )
 
 if(ANDROID)

app_check/src/include/firebase/app_check/recaptcha_enterprise_provider.h

@@ -0,0 +1,56 @@
+// 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.
+
+#ifndef FIREBASE_APP_CHECK_SRC_INCLUDE_FIREBASE_APP_CHECK_RECAPTCHA_ENTERPRISE_PROVIDER_H_
+#define FIREBASE_APP_CHECK_SRC_INCLUDE_FIREBASE_APP_CHECK_RECAPTCHA_ENTERPRISE_PROVIDER_H_
+
+#include "firebase/app_check.h"
+
+namespace firebase {
+namespace app_check {
+
+namespace internal {
+class RecaptchaEnterpriseProviderFactoryInternal;
+}
+
+/// Implementation of an {@link AppCheckProviderFactory} that builds
+/// RecaptchaEnterpriseProviders. This is the default implementation.
+class RecaptchaEnterpriseProviderFactory : public AppCheckProviderFactory {
+ public:
+#if !defined(DOXYGEN)
+  RecaptchaEnterpriseProviderFactory(const RecaptchaEnterpriseProviderFactory&) = delete;
+  RecaptchaEnterpriseProviderFactory& operator=(const RecaptchaEnterpriseProviderFactory&) =
+      delete;
+#endif  // !defined(DOXYGEN)
+
+  /// Gets an instance of this class for installation into a
+  /// firebase::app_check::AppCheck instance.
+  static RecaptchaEnterpriseProviderFactory* GetInstance();
+
+  /// Gets the AppCheckProvider associated with the given
+  /// {@link App} instance, or creates one if none
+  /// already exists.
+  firebase::app_check::AppCheckProvider* CreateProvider(App* app) override;
+
+ private:
+  RecaptchaEnterpriseProviderFactory();
+  ~RecaptchaEnterpriseProviderFactory() override;
+
+  internal::RecaptchaEnterpriseProviderFactoryInternal* internal_;
+};
+
+}  // namespace app_check
+}  // namespace firebase
+
+#endif  // FIREBASE_APP_CHECK_SRC_INCLUDE_FIREBASE_APP_CHECK_RECAPTCHA_ENTERPRISE_PROVIDER_H_

app_check/src/stub/recaptcha_enterprise_provider_stub.cc

@@ -0,0 +1,35 @@
+// 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.
+
+#include "app/src/log.h"
+#include "firebase/app_check/recaptcha_enterprise_provider.h"
+
+namespace firebase {
+namespace app_check {
+
+RecaptchaEnterpriseProviderFactory* RecaptchaEnterpriseProviderFactory::GetInstance() {
+  LogError("Recaptcha Enterprise is not supported on this platform.");
+  return nullptr;
+}
+
+RecaptchaEnterpriseProviderFactory::RecaptchaEnterpriseProviderFactory() {}
+
+RecaptchaEnterpriseProviderFactory::~RecaptchaEnterpriseProviderFactory() {}
+
+AppCheckProvider* RecaptchaEnterpriseProviderFactory::CreateProvider(App* app) {
+  return nullptr;
+}
+
+}  // namespace app_check
+}  // namespace firebase