feat(appcheck): appcheck recaptcha enterprise support

packages/firebase_app_check/firebase_app_check/android/build.gradle

@@ -78,6 +78,7 @@ android {
     implementation platform("com.google.firebase:firebase-bom:${getRootProjectExtOrCoreProperty("FirebaseSDKVersion", firebaseCoreProject)}")
     implementation 'com.google.firebase:firebase-appcheck-debug'
     implementation 'com.google.firebase:firebase-appcheck-playintegrity'
+    implementation 'com.google.firebase:firebase-appcheck-recaptcha'
     implementation 'androidx.annotation:annotation:1.7.0'
   }
 }

packages/firebase_app_check/firebase_app_check/android/src/main/kotlin/io/flutter/plugins/firebase/appcheck/FirebaseAppCheckPlugin.kt

@@ -11,6 +11,7 @@ import com.google.firebase.FirebaseApp
 import com.google.firebase.appcheck.FirebaseAppCheck
 import com.google.firebase.appcheck.debug.DebugAppCheckProviderFactory
 import com.google.firebase.appcheck.playintegrity.PlayIntegrityAppCheckProviderFactory
+import com.google.firebase.appcheck.recaptcha.RecaptchaAppCheckProviderFactory
 import io.flutter.embedding.engine.plugins.FlutterPlugin
 import io.flutter.embedding.engine.plugins.FlutterPlugin.FlutterPluginBinding
 import io.flutter.plugin.common.BinaryMessenger
@@ -62,6 +63,11 @@ class FirebaseAppCheckPlugin : FlutterFirebasePlugin, FlutterPlugin, FirebaseApp
           firebaseAppCheck.installAppCheckProviderFactory(
               DebugAppCheckProviderFactory.getInstance())
         }
+        "recaptcha" -> {
+          firebaseAppCheck.installAppCheckProviderFactory(
+            RecaptchaAppCheckProviderFactory.getInstance()
+          )
+        }
         else -> {
           firebaseAppCheck.installAppCheckProviderFactory(
               PlayIntegrityAppCheckProviderFactory.getInstance())

packages/firebase_app_check/firebase_app_check/android/src/main/kotlin/io/flutter/plugins/firebase/appcheck/GeneratedAndroidFirebaseAppCheck.g.kt

@@ -1,7 +1,7 @@
 // Copyright 2025, the Chromium project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
-// Autogenerated from Pigeon (v25.3.2), do not edit directly.
+// Autogenerated from Pigeon (v26.3.4), do not edit directly.
 // See also: https://pub.dev/packages/pigeon
 @file:Suppress("UNCHECKED_CAST", "ArrayInDataClass")
 
@@ -10,11 +10,12 @@ package io.flutter.plugins.firebase.appcheck
 import android.util.Log
 import io.flutter.plugin.common.BasicMessageChannel
 import io.flutter.plugin.common.BinaryMessenger
+import io.flutter.plugin.common.EventChannel
 import io.flutter.plugin.common.MessageCodec
+import io.flutter.plugin.common.StandardMethodCodec
 import io.flutter.plugin.common.StandardMessageCodec
 import java.io.ByteArrayOutputStream
 import java.nio.ByteBuffer
-
 private object GeneratedAndroidFirebaseAppCheckPigeonUtils {
 
   fun wrapResult(result: Any?): List<Any?> {
@@ -23,91 +24,69 @@ private object GeneratedAndroidFirebaseAppCheckPigeonUtils {
 
   fun wrapError(exception: Throwable): List<Any?> {
     return if (exception is FlutterError) {
-      listOf(exception.code, exception.message, exception.details)
+      listOf(
+        exception.code,
+        exception.message,
+        exception.details
+      )
     } else {
       listOf(
-          exception.javaClass.simpleName,
-          exception.toString(),
-          "Cause: " + exception.cause + ", Stacktrace: " + Log.getStackTraceString(exception))
+        exception.javaClass.simpleName,
+        exception.toString(),
+        "Cause: " + exception.cause + ", Stacktrace: " + Log.getStackTraceString(exception)
+      )
     }
   }
 }
 
 /**
  * Error class for passing custom error details to Flutter via a thrown PlatformException.
- *
  * @property code The error code.
  * @property message The error message.
  * @property details The error details. Must be a datatype supported by the api codec.
  */
-class FlutterError(
-    val code: String,
-    override val message: String? = null,
-    val details: Any? = null
-) : Throwable()
-
+class FlutterError (
+  val code: String,
+  override val message: String? = null,
+  val details: Any? = null
+) : RuntimeException()
 private open class GeneratedAndroidFirebaseAppCheckPigeonCodec : StandardMessageCodec() {
   override fun readValueOfType(type: Byte, buffer: ByteBuffer): Any? {
-    return super.readValueOfType(type, buffer)
+    return     super.readValueOfType(type, buffer)
   }
-
-  override fun writeValue(stream: ByteArrayOutputStream, value: Any?) {
+  override fun writeValue(stream: ByteArrayOutputStream, value: Any?)   {
     super.writeValue(stream, value)
   }
 }
 
+
 /** Generated interface from Pigeon that represents a handler of messages from Flutter. */
 interface FirebaseAppCheckHostApi {
-  fun activate(
-      appName: String,
-      androidProvider: String?,
-      appleProvider: String?,
-      debugToken: String?,
-      callback: (Result<Unit>) -> Unit
-  )
-
+  fun activate(appName: String, androidProvider: String?, appleProvider: String?, debugToken: String?, callback: (Result<Unit>) -> Unit)
   fun getToken(appName: String, forceRefresh: Boolean, callback: (Result<String?>) -> Unit)
-
-  fun setTokenAutoRefreshEnabled(
-      appName: String,
-      isTokenAutoRefreshEnabled: Boolean,
-      callback: (Result<Unit>) -> Unit
-  )
-
+  fun setTokenAutoRefreshEnabled(appName: String, isTokenAutoRefreshEnabled: Boolean, callback: (Result<Unit>) -> Unit)
   fun registerTokenListener(appName: String, callback: (Result<String>) -> Unit)
-
   fun getLimitedUseAppCheckToken(appName: String, callback: (Result<String>) -> Unit)
 
   companion object {
     /** The codec used by FirebaseAppCheckHostApi. */
-    val codec: MessageCodec<Any?> by lazy { GeneratedAndroidFirebaseAppCheckPigeonCodec() }
-    /**
-     * Sets up an instance of `FirebaseAppCheckHostApi` to handle messages through the
-     * `binaryMessenger`.
-     */
+    val codec: MessageCodec<Any?> by lazy {
+      GeneratedAndroidFirebaseAppCheckPigeonCodec()
+    }
+    /** Sets up an instance of `FirebaseAppCheckHostApi` to handle messages through the `binaryMessenger`. */
     @JvmOverloads
-    fun setUp(
-        binaryMessenger: BinaryMessenger,
-        api: FirebaseAppCheckHostApi?,
-        messageChannelSuffix: String = ""
-    ) {
-      val separatedMessageChannelSuffix =
-          if (messageChannelSuffix.isNotEmpty()) ".$messageChannelSuffix" else ""
+    fun setUp(binaryMessenger: BinaryMessenger, api: FirebaseAppCheckHostApi?, messageChannelSuffix: String = "") {
+      val separatedMessageChannelSuffix = if (messageChannelSuffix.isNotEmpty()) ".$messageChannelSuffix" else ""
       run {
-        val channel =
-            BasicMessageChannel<Any?>(
-                binaryMessenger,
-                "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.activate$separatedMessageChannelSuffix",
-                codec)
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.activate$separatedMessageChannelSuffix", codec)
         if (api != null) {
           channel.setMessageHandler { message, reply ->
             val args = message as List<Any?>
             val appNameArg = args[0] as String
             val androidProviderArg = args[1] as String?
             val appleProviderArg = args[2] as String?
             val debugTokenArg = args[3] as String?
-            api.activate(appNameArg, androidProviderArg, appleProviderArg, debugTokenArg) {
-                result: Result<Unit> ->
+            api.activate(appNameArg, androidProviderArg, appleProviderArg, debugTokenArg) { result: Result<Unit> ->
               val error = result.exceptionOrNull()
               if (error != null) {
                 reply.reply(GeneratedAndroidFirebaseAppCheckPigeonUtils.wrapError(error))
@@ -121,11 +100,7 @@ interface FirebaseAppCheckHostApi {
         }
       }
       run {
-        val channel =
-            BasicMessageChannel<Any?>(
-                binaryMessenger,
-                "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.getToken$separatedMessageChannelSuffix",
-                codec)
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.getToken$separatedMessageChannelSuffix", codec)
         if (api != null) {
           channel.setMessageHandler { message, reply ->
             val args = message as List<Any?>
@@ -146,18 +121,13 @@ interface FirebaseAppCheckHostApi {
         }
       }
       run {
-        val channel =
-            BasicMessageChannel<Any?>(
-                binaryMessenger,
-                "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.setTokenAutoRefreshEnabled$separatedMessageChannelSuffix",
-                codec)
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.setTokenAutoRefreshEnabled$separatedMessageChannelSuffix", codec)
         if (api != null) {
           channel.setMessageHandler { message, reply ->
             val args = message as List<Any?>
             val appNameArg = args[0] as String
             val isTokenAutoRefreshEnabledArg = args[1] as Boolean
-            api.setTokenAutoRefreshEnabled(appNameArg, isTokenAutoRefreshEnabledArg) {
-                result: Result<Unit> ->
+            api.setTokenAutoRefreshEnabled(appNameArg, isTokenAutoRefreshEnabledArg) { result: Result<Unit> ->
               val error = result.exceptionOrNull()
               if (error != null) {
                 reply.reply(GeneratedAndroidFirebaseAppCheckPigeonUtils.wrapError(error))
@@ -171,11 +141,7 @@ interface FirebaseAppCheckHostApi {
         }
       }
       run {
-        val channel =
-            BasicMessageChannel<Any?>(
-                binaryMessenger,
-                "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.registerTokenListener$separatedMessageChannelSuffix",
-                codec)
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.registerTokenListener$separatedMessageChannelSuffix", codec)
         if (api != null) {
           channel.setMessageHandler { message, reply ->
             val args = message as List<Any?>
@@ -195,11 +161,7 @@ interface FirebaseAppCheckHostApi {
         }
       }
       run {
-        val channel =
-            BasicMessageChannel<Any?>(
-                binaryMessenger,
-                "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.getLimitedUseAppCheckToken$separatedMessageChannelSuffix",
-                codec)
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.firebase_app_check_platform_interface.FirebaseAppCheckHostApi.getLimitedUseAppCheckToken$separatedMessageChannelSuffix", codec)
         if (api != null) {
           channel.setMessageHandler { message, reply ->
             val args = message as List<Any?>

packages/firebase_app_check/firebase_app_check/example/android/settings.gradle

@@ -22,7 +22,7 @@ plugins {
     // START: FlutterFire Configuration
     id "com.google.gms.google-services" version "4.3.15" apply false
     // END: FlutterFire Configuration
-    id "org.jetbrains.kotlin.android" version "1.9.22" apply false
+    id "org.jetbrains.kotlin.android" version "2.1.0" apply false
 }
 
 include ":app"