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/*
* Copyright (C) 2021 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.tv.settings.users;
import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.UserInfo;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.util.Log;
/**
* Manipulate and list restricted profiles on the device.
*/
public class RestrictedProfileModel {
private static final String TAG = "RestrictedProfile";
private final Context mContext;
private final boolean mApplyRestrictions;
private final ActivityManager mActivityManager;
private final UserManager mUserManager;
/** Cache the UserInfo we're running as because, unlike other profiles, it won't change. */
private final UserInfo mCurrentUserInfo;
public RestrictedProfileModel(final Context context) {
this(context, /* applyRestrictions= */ true);
}
public RestrictedProfileModel(final Context context, final boolean applyRestrictions) {
mContext = context;
mApplyRestrictions = applyRestrictions;
mActivityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
mCurrentUserInfo = mUserManager.getUserInfo(mContext.getUserId());
}
/** Switch into the restricted profile. */
public boolean enterUser() {
if (isCurrentUser()) {
Log.w(TAG, "Tried to switch into current user");
return false;
}
final UserInfo restrictedUser = getUser();
if (restrictedUser == null) {
Log.e(TAG, "Tried to enter non-existent restricted user");
return false;
}
updateBackgroundRestriction(restrictedUser);
switchUserNow(restrictedUser.id);
return true;
}
/** Switch out of the restricted profile, back into the primary user. */
public void exitUser() {
if (isCurrentUser()) {
switchUserNow(getOwnerUserId());
}
}
/**
* Remove the restricted profile.
*
* Called from another user. Requires permission to MANAGE_USERS.
*/
public void removeUser() {
final UserInfo restrictedUser = getUser();
if (restrictedUser == null) {
Log.w(TAG, "No restricted user to remove?");
return;
}
final int restrictedUserHandle = restrictedUser.id;
mUserManager.removeUser(restrictedUserHandle);
}
/** @return {@code true} if the current user is the restricted profile. */
public boolean isCurrentUser() {
return mCurrentUserInfo.isRestricted();
}
/**
* @return a @{link UserInfo} for the restricted profile, or {@code null} if there is no
* restricted profile on the device.
*/
public UserInfo getUser() {
if (mCurrentUserInfo.isRestricted()) {
return mCurrentUserInfo;
}
for (UserInfo userInfo : mUserManager.getUsers()) {
if (userInfo.isRestricted()) {
return userInfo;
}
}
return null;
}
/**
* @return user ID for the current user, or parent of the current user if it exists.
*/
private int getOwnerUserId() {
if (!mCurrentUserInfo.isRestricted()) {
return mCurrentUserInfo.id;
} else if (mCurrentUserInfo.restrictedProfileParentId == UserInfo.NO_PROFILE_GROUP_ID) {
return UserHandle.USER_OWNER;
} else {
return mCurrentUserInfo.restrictedProfileParentId;
}
}
/** Switch to {@param userId} or log an exception if this fails. */
private void switchUserNow(int userId) {
try {
mActivityManager.switchUser(userId);
} catch (RuntimeException e) {
Log.e(TAG, "Caught exception while switching user! ", e);
}
}
/**
* Profiles are allowed to run in the background by default, unless the device specifically
* sets a config flag and/or has the global setting overridden by something on-device.
*/
private void updateBackgroundRestriction(UserInfo user) {
if (!mApplyRestrictions) {
return;
}
final boolean allowedToRun = shouldAllowRunInBackground();
mUserManager.setUserRestriction(
UserManager.DISALLOW_RUN_IN_BACKGROUND, !allowedToRun, user.getUserHandle());
}
/**
* @see #updateBackgroundRestriction(UserInfo)
* @see Settings.Global#KEEP_PROFILE_IN_BACKGROUND
*/
private boolean shouldAllowRunInBackground() {
final boolean defaultValue = mContext.getResources().getBoolean(
mContext.getResources().getIdentifier("config_keepRestrictedProfilesInBackground",
"bool", "android"));
return Settings.Global.getInt(mContext.getContentResolver(),
Settings.Global.KEEP_PROFILE_IN_BACKGROUND, defaultValue ? 1 : 0) > 0;
}
}
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