chore: combined device secrets and asf device Id into one function

packages/auth/amplify_auth_cognito/android/src/main/kotlin/com/amazonaws/amplify/amplify_auth_cognito/AmplifyAuthCognitoPlugin.kt

@@ -103,6 +103,25 @@ open class AmplifyAuthCognitoPlugin :
     )
   }
 
+  /**
+   Legacy Device Secrets Storage.
+   */
+  private val legacyDeviceSecretsStore: LegacyKeyValueStore by lazy {
+    LegacyKeyValueStore(
+      applicationContext!!,
+      "CognitoIdentityProviderDeviceCache.<userPoolId>.<username>"
+    )
+  }
+
+  /**
+   ASF Device Secrets Storage.
+   */
+  private val asfDeviceSecretsStore: LegacyKeyValueStore by lazy {
+    LegacyKeyValueStore(
+      applicationContext!!,
+      "AWS.Cognito.ContextData"
+    )
+
   override fun onAttachedToEngine(binding: FlutterPlugin.FlutterPluginBinding) {
     Log.d(TAG, "onAttachedToEngine")
     applicationContext = binding.applicationContext
@@ -273,6 +292,40 @@ open class AmplifyAuthCognitoPlugin :
     callback(Result.success(data.build()))
   }
 
+  /**
+   * Get Legacy Device Secrets
+   */
+  override fun fetchLegacyDeviceSecrets(userPoolId: String?, appClientId: String?, callback: (Result<LegacyDeviceDetails>) -> Unit) {
+  val data = LegacyDeviceDetails.builder()
+
+  if (appClientId != null) {
+    val lastAuthUser = legacyUserPoolStore["CognitoIdentityProvider.$appClientId.LastAuthUser"]
+
+    val newLegacyDeviceSecretsStore = new LegacyKeyValueStore(
+      applicationContext!!,
+      "CognitoIdentityProviderDeviceCache.$userPoolId.$lastAuthUser"
+    )
+
+    val deviceKey = newLegacyDeviceSecretsStore["DeviceKey"]
+    val deviceSecret = newLegacyDeviceSecretsStore["DeviceSecret"]
+    val deviceGroup = newLegacyDeviceSecretsStore["DeviceGroupKey"]
+
+    data.apply {
+      this.deviceKey = deviceKey
+      this.deviceSecret = deviceSecret
+      this.deviceGroupKey = deviceGroup
+    }
+
+  }
+
+  val asfDeviceId = asfDeviceSecretsStore["CognitoDeviceId"]
+  data.apply {
+    this.asfDeviceId = asfDeviceId
+  }
+
+  callback(Result.success(data.build()))
+}
+
   /**
    * Clears the legacy credentials set by the Android SDK
    */
@@ -572,3 +625,19 @@ class LegacyCredentialStoreDataBuilder(
     idToken,
   )
 }
+
+fun LegacyDeviceDetails.Companion.builder() = LegacyDeviceDetailsBuilder()
+
+class LegacyDeviceDetailsBuilder(
+  var deviceKey: String? = null,
+  var deviceSecret: String? = null,
+  var deviceGroupKey: String? = null,
+  var asfDeviceId: String? = null,
+) {
+  fun build(): LegacyDeviceDetails = LegacyDeviceDetails(
+    deviceKey,
+    deviceSecret,
+    deviceGroupKey,
+    asfDeviceId,
+  )
+}

packages/auth/amplify_auth_cognito/android/src/main/kotlin/com/amazonaws/amplify/amplify_auth_cognito/LegacySecretHandler.kt

@@ -3,6 +3,24 @@ package com.amazonaws.amplify.amplify_auth_cognito
 import android.content.Context
 import io.flutter.plugin.common.PluginRegistry
 
-class LegacySecretHandlerImpl(private val context: Context) : LegacySecretHandler {
+class LegacySecretHandlerImpl(private val context: Context) : LegacySecretHandler, MethodChannel.MethodCallHandler {
+
+    private val channel = MethodChannel(registrar.messenger(), "com.amazonaws.amplify/amplify_auth_cognito")
+
+    override fun fetchLegacyDeviceSecrets(userPoolConfig: CognitoUserPoolConfig?): LegacyDeviceDetails?{
+        return null
+    }
+
+    override fun deleteLegacyDeviceSecrets(userPoolConfig: CognitoUserPoolConfig?) {
+        channel.invokeMethod("deleteLegacyDeviceSecrets", userPoolConfig?.poolId)
+    }
+
+    override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
+        if (call.method == "getDeviceId") {
+            result.success(getDeviceId())
+        } else {
+            result.notImplemented()
+        }
+    }
 
 }