src/com/android/packageinstaller/permission/ui/wear/AppPermissionsFragmentWear.java

/*
* Copyright (C) 2015 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.packageinstaller.permission.ui.wear;

import android.Manifest;
import android.app.Activity;
import android.app.Fragment;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.preference.SwitchPreference;
import android.support.wearable.view.WearableDialogHelper;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.android.packageinstaller.R;
import com.android.packageinstaller.permission.model.AppPermissionGroup;
import com.android.packageinstaller.permission.model.AppPermissions;
import com.android.packageinstaller.permission.utils.LocationUtils;
import com.android.packageinstaller.permission.utils.SafetyNetLogger;
import com.android.packageinstaller.permission.utils.Utils;

import java.util.ArrayList;
import java.util.List;

public final class AppPermissionsFragmentWear extends PreferenceFragment {
    private static final String LOG_TAG = "AppPermFragWear";

    private static final String KEY_NO_PERMISSIONS = "no_permissions";

    public static AppPermissionsFragmentWear newInstance(String packageName) {
        return setPackageName(new AppPermissionsFragmentWear(), packageName);
    }

    private static <T extends Fragment> T setPackageName(T fragment, String packageName) {
        Bundle arguments = new Bundle();
        arguments.putString(Intent.EXTRA_PACKAGE_NAME, packageName);
        fragment.setArguments(arguments);
        return fragment;
    }

    private List<AppPermissionGroup> mToggledGroups;
    private AppPermissions mAppPermissions;

    private boolean mHasConfirmedRevoke;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String packageName = getArguments().getString(Intent.EXTRA_PACKAGE_NAME);
        Activity activity = getActivity();
        PackageManager pm = activity.getPackageManager();
        PackageInfo packageInfo;

        try {
            packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_PERMISSIONS);
        } catch (PackageManager.NameNotFoundException e) {
            Log.i(LOG_TAG, "No package:" + activity.getCallingPackage(), e);
            packageInfo = null;
        }

        if (packageInfo == null) {
            Toast.makeText(activity, R.string.app_not_found_dlg_title, Toast.LENGTH_LONG).show();
            activity.finish();
            return;
        }

        mAppPermissions = new AppPermissions(
                activity, packageInfo, null, true, () -> getActivity().finish());

        addPreferencesFromResource(R.xml.watch_permissions);
        initializePermissionGroupList();
    }

    @Override
    public void onResume() {
        super.onResume();
        mAppPermissions.refresh();

        // Also refresh the UI
        for (final AppPermissionGroup group : mAppPermissions.getPermissionGroups()) {
            Preference pref = findPreference(group.getName());
            if (pref instanceof SwitchPreference) {
                ((SwitchPreference) pref).setChecked(group.areRuntimePermissionsGranted());
            }
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        logAndClearToggledGroups();
    }

    private void initializePermissionGroupList() {
        final String packageName = mAppPermissions.getPackageInfo().packageName;
        List<AppPermissionGroup> groups = mAppPermissions.getPermissionGroups();
        List<SwitchPreference> nonSystemGroups = new ArrayList<>();

        if (!groups.isEmpty()) {
            getPreferenceScreen().removePreference(findPreference(KEY_NO_PERMISSIONS));
        }

        for (final AppPermissionGroup group : groups) {
            if (!Utils.shouldShowPermission(group, packageName)) {
                continue;
            }

            boolean isPlatform = group.getDeclaringPackage().equals(Utils.OS_PKG);

            final SwitchPreference pref = new SwitchPreference(getContext());
            pref.setKey(group.getName());
            pref.setTitle(group.getLabel());
            pref.setChecked(group.areRuntimePermissionsGranted());

            if (group.isPolicyFixed()) {
                pref.setEnabled(false);
            } else {
                pref.setOnPreferenceChangeListener((p, newVal) -> {
                    if (LocationUtils.isLocationGroupAndProvider(
                            group.getName(), group.getApp().packageName)) {
                        LocationUtils.showLocationDialog(
                                getContext(), mAppPermissions.getAppLabel());
                        return false;
                    }

                    if ((Boolean) newVal) {
                        setPermission(group, pref, true);
                    } else {
                        final boolean grantedByDefault = group.hasGrantedByDefaultPermission();
                        if (grantedByDefault
                                || (!group.hasRuntimePermission() && !mHasConfirmedRevoke)) {
                            new WearableDialogHelper.DialogBuilder(getContext())
                                    .setNegativeIcon(R.drawable.confirm_button)
                                    .setPositiveIcon(R.drawable.cancel_button)
                                    .setNegativeButton(R.string.grant_dialog_button_deny_anyway,
                                            (dialog, which) -> {
                                                setPermission(group, pref, false);
                                                if (!group.hasGrantedByDefaultPermission()) {
                                                    mHasConfirmedRevoke = true;
                                                }
                                            })
                                    .setPositiveButton(R.string.cancel, (dialog, which) -> {})
                                    .setMessage(grantedByDefault ?
                                            R.string.system_warning : R.string.old_sdk_deny_warning)
                                    .show();
                            return false;
                        } else {
                            setPermission(group, pref, false);
                        }
                    }

                    return true;
                });
            }

            // The UI shows System settings first, then non-system settings
            if (isPlatform) {
                getPreferenceScreen().addPreference(pref);
            } else {
                nonSystemGroups.add(pref);
            }
        }

        // Now add the non-system settings to the end of the list
        for (SwitchPreference nonSystemGroup : nonSystemGroups) {
            getPreferenceScreen().addPreference(nonSystemGroup);
        }
    }

    private void setPermission(AppPermissionGroup group, SwitchPreference pref, boolean grant) {
        if (grant) {
            group.grantRuntimePermissions(false);
        } else {
            group.revokeRuntimePermissions(false);
        }
        addToggledGroup(group);
        pref.setChecked(grant);
    }

    private void addToggledGroup(AppPermissionGroup group) {
        if (mToggledGroups == null) {
            mToggledGroups = new ArrayList<>();
        }
        // Double toggle is back to initial state.
        if (mToggledGroups.contains(group)) {
            mToggledGroups.remove(group);
        } else {
            mToggledGroups.add(group);
        }
    }

    private void logAndClearToggledGroups() {
        if (mToggledGroups != null) {
            String packageName = mAppPermissions.getPackageInfo().packageName;
            SafetyNetLogger.logPermissionsToggled(packageName, mToggledGroups);
            mToggledGroups = null;
        }
    }
}