Merge "Retrieve apps with recent location access"

/*

 * Copyright (C) 2018 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.settingslib.location;

import android.app.AppOpsManager;

import android.content.Context;

import android.content.pm.ApplicationInfo;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.graphics.drawable.Drawable;

import android.os.Process;

import android.os.UserHandle;

import android.os.UserManager;

import android.text.format.DateUtils;

import android.util.IconDrawableFactory;

import android.util.Log;

import androidx.annotation.VisibleForTesting;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

/**

 * Retrieves the information of applications which accessed location recently.

 */

public class RecentLocationAccesses {

    private static final String TAG = RecentLocationAccesses.class.getSimpleName();

    @VisibleForTesting

    static final String ANDROID_SYSTEM_PACKAGE_NAME = "android";

    // Keep last 24 hours of location app information.

    private static final long RECENT_TIME_INTERVAL_MILLIS = DateUtils.DAY_IN_MILLIS;

    @VisibleForTesting

    static final int[] LOCATION_OPS = new int[]{

            AppOpsManager.OP_FINE_LOCATION,

            AppOpsManager.OP_COARSE_LOCATION,

    };

    private final PackageManager mPackageManager;

    private final Context mContext;

    private final IconDrawableFactory mDrawableFactory;

    public RecentLocationAccesses(Context context) {

        mContext = context;

        mPackageManager = context.getPackageManager();

        mDrawableFactory = IconDrawableFactory.newInstance(context);

    }

    /**

     * Fills a list of applications which queried location recently within specified time.

     * Apps are sorted by recency. Apps with more recent location accesses are in the front.

     */

    public List<Access> getAppList() {

        // Retrieve a location usage list from AppOps

        AppOpsManager aoManager =

                (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE);

        List<AppOpsManager.PackageOps> appOps = aoManager.getPackagesForOps(LOCATION_OPS);

        final int appOpsCount = appOps != null ? appOps.size() : 0;

        // Process the AppOps list and generate a preference list.

        ArrayList<Access> accesses = new ArrayList<>(appOpsCount);

        final long now = System.currentTimeMillis();

        final UserManager um = (UserManager) mContext.getSystemService(Context.USER_SERVICE);

        final List<UserHandle> profiles = um.getUserProfiles();

        for (int i = 0; i < appOpsCount; ++i) {

            AppOpsManager.PackageOps ops = appOps.get(i);

            // Don't show the Android System in the list - it's not actionable for the user.

            // Also don't show apps belonging to background users except managed users.

            String packageName = ops.getPackageName();

            int uid = ops.getUid();

            int userId = UserHandle.getUserId(uid);

            boolean isAndroidOs =

                    (uid == Process.SYSTEM_UID) && ANDROID_SYSTEM_PACKAGE_NAME.equals(packageName);

            if (isAndroidOs || !profiles.contains(new UserHandle(userId))) {

                continue;

            }

            Access access = getAccessFromOps(now, ops);

            if (access != null) {

                accesses.add(access);

            }

        }

        return accesses;

    }

    public List<Access> getAppListSorted() {

        List<Access> accesses = getAppList();

        // Sort the list of Access by recency. Most recent accesses first.

        Collections.sort(accesses, Collections.reverseOrder(new Comparator<Access>() {

            @Override

            public int compare(Access access1, Access access2) {

                return Long.compare(access1.accessFinishTime, access2.accessFinishTime);

            }

        }));

        return accesses;

    }

    /**

     * Creates a Access entry for the given PackageOps.

     *

     * This method examines the time interval of the PackageOps first. If the PackageOps is older

     * than the designated interval, this method ignores the PackageOps object and returns null.

     * When the PackageOps is fresh enough, this method returns a Access object for the package

     */

    private Access getAccessFromOps(long now,

            AppOpsManager.PackageOps ops) {

        String packageName = ops.getPackageName();

        List<AppOpsManager.OpEntry> entries = ops.getOps();

        long locationAccessFinishTime = 0L;

        // Earliest time for a location access to end and still be shown in list.

        long recentLocationCutoffTime = now - RECENT_TIME_INTERVAL_MILLIS;

        for (AppOpsManager.OpEntry entry : entries) {

            locationAccessFinishTime = Math.max(entry.getLastAccessBackgroundTime(),

                    entry.getLastAccessForegroundTime());

        }

        // Bail out if the entry is out of date.

        if (locationAccessFinishTime < recentLocationCutoffTime) {

            return null;

        }

        // The package is fresh enough, continue.

        int uid = ops.getUid();

        int userId = UserHandle.getUserId(uid);

        Access access = null;

        try {

            ApplicationInfo appInfo = mPackageManager.getApplicationInfoAsUser(

                    packageName, PackageManager.GET_META_DATA, userId);

            if (appInfo == null) {

                Log.w(TAG, "Null application info retrieved for package " + packageName

                        + ", userId " + userId);

                return null;

            }

            final UserHandle userHandle = new UserHandle(userId);

            Drawable icon = mDrawableFactory.getBadgedIcon(appInfo, userId);

            CharSequence appLabel = mPackageManager.getApplicationLabel(appInfo);

            CharSequence badgedAppLabel = mPackageManager.getUserBadgedLabel(appLabel, userHandle);

            if (appLabel.toString().contentEquals(badgedAppLabel)) {

                // If badged label is not different from original then no need for it as

                // a separate content description.

                badgedAppLabel = null;

            }

            access = new Access(packageName, userHandle, icon, appLabel, badgedAppLabel,

                    locationAccessFinishTime);

        } catch (NameNotFoundException e) {

            Log.w(TAG, "package name not found for " + packageName + ", userId " + userId);

        }

        return access;

    }

    public static class Access {

        public final String packageName;

        public final UserHandle userHandle;

        public final Drawable icon;

        public final CharSequence label;

        public final CharSequence contentDescription;

        public final long accessFinishTime;

        private Access(String packageName, UserHandle userHandle, Drawable icon,

                CharSequence label, CharSequence contentDescription,

                long accessFinishTime) {

            this.packageName = packageName;

            this.userHandle = userHandle;

            this.icon = icon;

            this.label = label;

            this.contentDescription = contentDescription;

            this.accessFinishTime = accessFinishTime;

        }

    }

}