Adding Manage External Sources Settings

Added a settings fragment to manage external sources. It lists all
applications that have either requested REQUEST_INSTALL_PACKAGES or have
their app op changed from default.

Test: Will include in follow-up CL. Tracked in b/33792674

Bug: 31002700
Change-Id: Ibd2a1922be214b62aec4eefa45f7b9691256b205

src/com/android/settings/applications/AppStateInstallAppsBridge.java

@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2017 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.settings.applications;
+
+import android.Manifest;
+import android.app.AppGlobals;
+import android.app.AppOpsManager;
+import android.content.Context;
+import android.content.pm.IPackageManager;
+import android.content.pm.PackageManager;
+import android.os.RemoteException;
+import android.util.Log;
+
+import com.android.internal.util.ArrayUtils;
+import com.android.settings.R;
+import com.android.settingslib.applications.ApplicationsState;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+import com.android.settingslib.applications.ApplicationsState.AppFilter;
+
+import java.util.List;
+
+/**
+ * Connects app op info to the ApplicationsState. Wraps around the generic AppStateBaseBridge
+ * class to tailor to the semantics of {@link AppOpsManager#OP_REQUEST_INSTALL_PACKAGES}
+ * Also provides app filters that can use the info.
+ */
+public class AppStateInstallAppsBridge extends AppStateBaseBridge {
+
+    private static final String TAG = AppStateInstallAppsBridge.class.getSimpleName();
+
+    private final IPackageManager mIpm;
+    private final AppOpsManager mAppOpsManager;
+    private final Context mContext;
+
+    public AppStateInstallAppsBridge(Context context, ApplicationsState appState,
+            Callback callback) {
+        super(appState, callback);
+        mContext = context;
+        mIpm = AppGlobals.getPackageManager();
+        mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
+    }
+
+    @Override
+    protected void updateExtraInfo(AppEntry app, String packageName, int uid) {
+        app.extraInfo = createInstallAppsStateFor(packageName, uid);
+    }
+
+    @Override
+    protected void loadAllExtraInfo() {
+        // TODO: consider making this a batch operation with a single binder call
+        final List<AppEntry> allApps = mAppSession.getAllApps();
+        for (int i = 0; i < allApps.size(); i++) {
+            AppEntry currentEntry = allApps.get(i);
+            updateExtraInfo(currentEntry, currentEntry.info.packageName, currentEntry.info.uid);
+        }
+    }
+
+    private boolean hasRequestedAppOpPermission(String permission, String packageName) {
+        try {
+            String[] packages = mIpm.getAppOpPermissionPackages(permission);
+            return ArrayUtils.contains(packages, packageName);
+        } catch (RemoteException exc) {
+            Log.e(TAG, "PackageManager dead. Cannot get permission info");
+            return false;
+        }
+    }
+
+    private boolean hasPermission(String permission, int uid) {
+        try {
+            int result = mIpm.checkUidPermission(permission, uid);
+            return result == PackageManager.PERMISSION_GRANTED;
+        } catch (RemoteException e) {
+            Log.e(TAG, "PackageManager dead. Cannot get permission info");
+            return false;
+        }
+    }
+
+    private int getAppOpMode(int appOpCode, int uid, String packageName) {
+        return mAppOpsManager.checkOpNoThrow(appOpCode, uid, packageName);
+    }
+
+    InstallAppsState createInstallAppsStateFor(String packageName, int uid) {
+        final InstallAppsState appState = new InstallAppsState();
+        appState.permissionRequested = hasRequestedAppOpPermission(
+                Manifest.permission.REQUEST_INSTALL_PACKAGES, packageName);
+        appState.permissionGranted = hasPermission(Manifest.permission.REQUEST_INSTALL_PACKAGES,
+                uid);
+        appState.appOpMode = getAppOpMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES, uid,
+                packageName);
+        return appState;
+    }
+
+    /**
+     * Collection of information to be used as {@link AppEntry#extraInfo} objects
+     */
+    public static class InstallAppsState {
+        boolean permissionRequested;
+        boolean permissionGranted;
+        int appOpMode;
+
+        public InstallAppsState() {
+            this.appOpMode = AppOpsManager.MODE_DEFAULT;
+        }
+
+        public boolean canInstallApps() {
+            if (appOpMode == AppOpsManager.MODE_DEFAULT) {
+                return permissionGranted;
+            } else {
+                return appOpMode == AppOpsManager.MODE_ALLOWED;
+            }
+        }
+
+        public int getSummary() {
+            return canInstallApps() ? R.string.external_source_trusted
+                    : R.string.external_source_untrusted;
+        }
+
+        @Override
+        public String toString() {
+            StringBuilder sb = new StringBuilder("[permissionGranted: " + permissionGranted);
+            sb.append(", permissionRequested: " + permissionRequested);
+            sb.append(", appOpMode: " + appOpMode);
+            sb.append("]");
+            return sb.toString();
+        }
+    }
+
+    static final AppFilter FILTER_APP_SOURCES = new AppFilter() {
+
+        @Override
+        public void init() {
+        }
+
+        @Override
+        public boolean filterApp(AppEntry info) {
+            if (info.extraInfo == null || !(info.extraInfo instanceof InstallAppsState)) {
+                return false;
+            }
+            InstallAppsState state = (InstallAppsState) info.extraInfo;
+            return (state.appOpMode != AppOpsManager.MODE_DEFAULT) || state.permissionRequested;
+        }
+    };
+}