Merge "Init BackgroundInstallControlService"

core/java/android/content/Context.java

@@ -5201,6 +5201,15 @@ public abstract class Context {
      */
     public static final String DROPBOX_SERVICE = "dropbox";
 
+    /**
+     * System service name for BackgroundInstallControlService. This service supervises the MBAs
+     * on device and provides the related metadata of the MBAs.
+     *
+     * @hide
+     */
+    @SuppressLint("ServiceName")
+    public static final String BACKGROUND_INSTALL_CONTROL_SERVICE = "background_install_control";
+
     /**
      * System service name for BinaryTransparencyService. This is used to retrieve measurements
      * pertaining to various pre-installed and system binaries on device for the purposes of

core/java/android/content/pm/IBackgroundInstallControlService.aidl

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2022 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.content.pm;
+
+import android.content.pm.ParceledListSlice;
+
+/**
+ * {@hide}
+ */
+interface IBackgroundInstallControlService {
+    ParceledListSlice getBackgroundInstalledPackages(long flags, int userId);
+}

services/core/java/com/android/server/pm/BackgroundInstallControlService.java

@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2022 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 com.android.server.pm;
+
+import android.annotation.NonNull;
+import android.content.Context;
+import android.content.pm.IBackgroundInstallControlService;
+import android.content.pm.IPackageManager;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.ParceledListSlice;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.util.SparseArrayMap;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.server.SystemService;
+
+/**
+ * @hide
+ */
+public class BackgroundInstallControlService extends SystemService {
+    private static final String TAG = "BackgroundInstallControlService";
+
+    private final Context mContext;
+    private final BinderService mBinderService;
+    private final IPackageManager mIPackageManager;
+
+    // User ID -> package name -> time diff
+    // The time diff between the last foreground activity installer and
+    // the "onPackageAdded" function call.
+    private final SparseArrayMap<String, Long> mBackgroundInstalledPackages =
+            new SparseArrayMap<>();
+
+    public BackgroundInstallControlService(@NonNull Context context) {
+        this(new InjectorImpl(context));
+    }
+
+    @VisibleForTesting
+    BackgroundInstallControlService(@NonNull Injector injector) {
+        super(injector.getContext());
+        mContext = injector.getContext();
+        mIPackageManager = injector.getIPackageManager();
+        mBinderService = new BinderService(this);
+    }
+
+    private static final class BinderService extends IBackgroundInstallControlService.Stub {
+        final BackgroundInstallControlService mService;
+
+        BinderService(BackgroundInstallControlService service)  {
+            mService = service;
+        }
+
+        @Override
+        public ParceledListSlice<PackageInfo> getBackgroundInstalledPackages(
+                @PackageManager.PackageInfoFlagsBits long flags, int userId) {
+            ParceledListSlice<PackageInfo> packages;
+            try {
+                packages = mService.mIPackageManager.getInstalledPackages(flags, userId);
+            } catch (RemoteException e) {
+                throw new IllegalStateException("Package manager not available", e);
+            }
+
+            // TODO(b/244216300): to enable the test the usage by BinaryTransparencyService,
+            // we currently comment out the actual implementation.
+            // The fake implementation is just to filter out the first app of the list.
+            // for (int i = 0, size = packages.getList().size(); i < size; i++) {
+            //     String packageName = packages.getList().get(i).packageName;
+            //     if (!mBackgroundInstalledPackages.contains(userId, packageName) {
+            //         packages.getList().remove(i);
+            //     }
+            // }
+            if (packages.getList().size() > 0) {
+                packages.getList().remove(0);
+            }
+            return packages;
+        }
+    }
+
+    /**
+     * Called when the system service should publish a binder service using
+     * {@link #publishBinderService(String, IBinder).}
+     */
+    @Override
+    public void onStart() {
+        publishBinderService(Context.BACKGROUND_INSTALL_CONTROL_SERVICE, mBinderService);
+    }
+
+    /**
+     * Dependency injector for {@link #BackgroundInstallControlService)}.
+     */
+    interface Injector {
+        Context getContext();
+
+        IPackageManager getIPackageManager();
+    }
+
+    private static final class InjectorImpl implements Injector {
+        private final Context mContext;
+
+        InjectorImpl(Context context) {
+            mContext = context;
+        }
+
+        @Override
+        public Context getContext() {
+            return mContext;
+        }
+
+        @Override
+        public IPackageManager getIPackageManager() {
+            return IPackageManager.Stub.asInterface(ServiceManager.getService("package"));
+        }
+    }
+}

services/java/com/android/server/SystemServer.java

@@ -154,6 +154,7 @@ import com.android.server.os.SchedulingPolicyService;
 import com.android.server.people.PeopleService;
 import com.android.server.pm.ApexManager;
 import com.android.server.pm.ApexSystemServiceInfo;
+import com.android.server.pm.BackgroundInstallControlService;
 import com.android.server.pm.CrossProfileAppsService;
 import com.android.server.pm.DataLoaderManagerService;
 import com.android.server.pm.DynamicCodeLoggingService;
@@ -2469,6 +2470,10 @@ public final class SystemServer implements Dumpable {
             t.traceBegin("StartMediaMetricsManager");
             mSystemServiceManager.startService(MediaMetricsManagerService.class);
             t.traceEnd();
+
+            t.traceBegin("StartBackgroundInstallControlService");
+            mSystemServiceManager.startService(BackgroundInstallControlService.class);
+            t.traceEnd();
         }
 
         t.traceBegin("StartMediaProjectionManager");