[CDM perm sync] Add feature flag check for perm sync APIs

Bug: 193583135

Test: manually tested the APIs
Change-Id: Ifb02bfb773328a90b664d7b493dc8d22c1c8a978

core/java/android/companion/CompanionDeviceManager.java

@@ -25,6 +25,7 @@ import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.RequiresPermission;
+import android.annotation.SuppressLint;
 import android.annotation.SystemApi;
 import android.annotation.SystemService;
 import android.annotation.UserHandleAware;
@@ -33,6 +34,7 @@ import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
+import android.companion.utils.FeatureUtils;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
@@ -81,6 +83,7 @@ import java.util.function.Consumer;
  * @see CompanionDeviceManager#associate
  * @see AssociationRequest
  */
+@SuppressLint("LongLogTag")
 @SystemService(Context.COMPANION_DEVICE_SERVICE)
 public final class CompanionDeviceManager {
 
@@ -876,8 +879,12 @@ public final class CompanionDeviceManager {
 
     /** {@hide} */
     @RequiresPermission(android.Manifest.permission.DELIVER_COMPANION_MESSAGES)
-    public final void attachSystemDataTransport(int associationId, @NonNull InputStream in,
+    public void attachSystemDataTransport(int associationId, @NonNull InputStream in,
             @NonNull OutputStream out) throws DeviceNotAssociatedException {
+        if (!FeatureUtils.isPermSyncEnabled()) {
+            Log.e(LOG_TAG, "Calling attachSystemDataTransport, but perm sync is disabled.");
+            return;
+        }
         synchronized (mTransports) {
             if (mTransports.contains(associationId)) {
                 detachSystemDataTransport(associationId);
@@ -895,8 +902,12 @@ public final class CompanionDeviceManager {
 
     /** {@hide} */
     @RequiresPermission(android.Manifest.permission.DELIVER_COMPANION_MESSAGES)
-    public final void detachSystemDataTransport(int associationId)
+    public void detachSystemDataTransport(int associationId)
             throws DeviceNotAssociatedException {
+        if (!FeatureUtils.isPermSyncEnabled()) {
+            Log.e(LOG_TAG, "Calling detachSystemDataTransport, but perm sync is disabled.");
+            return;
+        }
         synchronized (mTransports) {
             final Transport transport = mTransports.get(associationId);
             if (transport != null) {
@@ -1004,6 +1015,11 @@ public final class CompanionDeviceManager {
     @Nullable
     public IntentSender buildPermissionTransferUserConsentIntent(int associationId)
             throws DeviceNotAssociatedException {
+        if (!FeatureUtils.isPermSyncEnabled()) {
+            Log.e(LOG_TAG, "Calling buildPermissionTransferUserConsentIntent,"
+                    + " but perm sync is disabled.");
+            return null;
+        }
         try {
             PendingIntent pendingIntent = mService.buildPermissionTransferUserConsentIntent(
                     mContext.getOpPackageName(),
@@ -1036,6 +1052,10 @@ public final class CompanionDeviceManager {
     @Deprecated
     @UserHandleAware
     public void startSystemDataTransfer(int associationId) throws DeviceNotAssociatedException {
+        if (!FeatureUtils.isPermSyncEnabled()) {
+            Log.e(LOG_TAG, "Calling startSystemDataTransfer, but perm sync is disabled.");
+            return;
+        }
         try {
             mService.startSystemDataTransfer(mContext.getOpPackageName(), mContext.getUserId(),
                     associationId, null);

core/java/android/companion/utils/FeatureUtils.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package android.companion.utils;
+
+import android.os.Build;
+import android.provider.DeviceConfig;
+
+/**
+ * Util class for feature flags
+ *
+ * @hide
+ */
+public final class FeatureUtils {
+
+    private static final String NAMESPACE_COMPANION = "companion";
+
+    private static final String PROPERTY_PERM_SYNC_ENABLED = "perm_sync_enabled";
+
+    public static boolean isPermSyncEnabled() {
+        return Build.isDebuggable() || DeviceConfig.getBoolean(NAMESPACE_COMPANION,
+                PROPERTY_PERM_SYNC_ENABLED, false);
+    }
+
+    private FeatureUtils() {
+    }
+}