/**
* Copyright (c) 2014, 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.notification;
import android.app.ActivityManager;
import android.app.PendingIntent;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.pm.UserInfo;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.os.IInterface;
import android.os.RemoteException;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.ArraySet;
import android.util.Log;
import android.util.Slog;
import android.util.SparseArray;
import com.android.server.notification.NotificationManagerService.DumpFilter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
/**
* Manages the lifecycle of application-provided services bound by system server.
*
* Services managed by this helper must have:
* - An associated system settings value with a list of enabled component names.
* - A well-known action for services to use in their intent-filter.
* - A system permission for services to require in order to ensure system has exclusive binding.
* - A settings page for user configuration of enabled services, and associated intent action.
* - A remote interface definition (aidl) provided by the service used for communication.
*/
abstract public class ManagedServices {
protected final String TAG = getClass().getSimpleName();
protected final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
private static final String ENABLED_SERVICES_SEPARATOR = ":";
protected final Context mContext;
protected final Object mMutex;
private final UserProfiles mUserProfiles;
private final SettingsObserver mSettingsObserver;
private final Config mConfig;
// contains connections to all connected services, including app services
// and system services
protected final ArrayList<ManagedServiceInfo> mServices = new ArrayList<ManagedServiceInfo>();
// things that will be put into mServices as soon as they're ready
private final ArrayList<String> mServicesBinding = new ArrayList<String>();
// lists the component names of all enabled (and therefore connected)
// app services for current profiles.
private ArraySet<ComponentName> mEnabledServicesForCurrentProfiles
= new ArraySet<ComponentName>();
// Just the packages from mEnabledServicesForCurrentProfiles
private ArraySet<String> mEnabledServicesPackageNames = new ArraySet<String>();
// Kept to de-dupe user change events (experienced after boot, when we receive a settings and a
// user change).
private int[] mLastSeenProfileIds;
public ManagedServices(Context context, Handler handler, Object mutex,
UserProfiles userProfiles) {
mContext = context;
mMutex = mutex;
mUserProfiles = userProfiles;
mConfig = getConfig();
mSettingsObserver = new SettingsObserver(handler);
}
abstract protected Config getConfig();
private String getCaption() {
return mConfig.caption;
}
abstract protected IInterface asInterface(IBinder binder);
abstract protected void onServiceAdded(ManagedServiceInfo info);
protected void onServiceRemovedLocked(ManagedServiceInfo removed) { }
private ManagedServiceInfo newServiceInfo(IInterface service,
ComponentName component, int userid, boolean isSystem, ServiceConnection connection,
int targetSdkVersion) {
return new ManagedServiceInfo(service, component, userid, isSystem, connection,
targetSdkVersion);
}
public void onBootPhaseAppsCanStart() {
mSettingsObserver.observe();
}
public void dump(PrintWriter pw, DumpFilter filter) {
pw.println(" All " + getCaption() + "s (" + mEnabledServicesForCurrentProfiles.size()
+ ") enabled for current profiles:");
for (ComponentName cmpt : mEnabledServicesForCurrentProfiles) {
if (filter != null && !filter.matches(cmpt)) continue;
pw.println(" " + cmpt);
}
pw.println(" Live " + getCaption() + "s (" + mServices.size() + "):");
for (ManagedServiceInfo info : mServices) {
if (filter != null && !filter.matches(info.component)) continue;
pw.println(" " + info.component
+ " (user " + info.userid + "): " + info.service
+ (info.isSystem?" SYSTEM":""));
}
}
public void onPackagesChanged(boolean queryReplace, String[] pkgList) {
if (DEBUG) Slog.d(TAG, "onPackagesChanged queryReplace=" + queryReplace
+ " pkgList=" + (pkgList == null ? null : Arrays.asList(pkgList))
+ " mEnabledServicesPackageNames=" + mEnabledServicesPackageNames);
boolean anyServicesInvolved = false;
if (pkgList != null && (pkgList.length > 0)) {
for (String pkgName : pkgList) {
if (mEnabledServicesPackageNames.contains(pkgName)) {
anyServicesInvolved = true;
}
}
}
if (anyServicesInvolved) {
// if we're not replacing a package, clean up orphaned bits
if (!queryReplace) {
disableNonexistentServices();
}
// make sure we're still bound to any of our services who may have just upgraded
rebindServices();
}
}
public void onUserSwitched() {
if (DEBUG) Slog.d(TAG, "onUserSwitched");
if (Arrays.equals(mLastSeenProfileIds, mUserProfiles.getCurrentProfileIds())) {
if (DEBUG) Slog.d(TAG, "Current profile IDs didn't change, skipping rebindServices().");
return;
}
rebindServices();
}
public ManagedServiceInfo checkServiceTokenLocked(IInterface service) {
checkNotNull(service);
final IBinder token = service.asBinder();
final int N = mServices.size();
for (int i=0; i<N; i++) {
final ManagedServiceInfo info = mServices.get(i);
if (info.service.asBinder() == token) return info;
}
throw new SecurityException("Disallowed call from unknown " + getCaption() + ": "
+ service);
}
public void unregisterService(IInterface service, int userid) {
checkNotNull(service);
// no need to check permissions; if your service binder is in the list,
// that's proof that you had permission to add it in the first place
unregisterServiceImpl(service, userid);
}
public void registerService(IInterface service, ComponentName component, int userid) {
checkNotNull(service);
ManagedServiceInfo info = registerServiceImpl(service, component, userid);
if (info != null) {
onServiceAdded(info);
}
}
/**
* Remove access for any services that no longer exist.
*/
private void disableNonexistentServices() {
int[] userIds = mUserProfiles.getCurrentProfileIds();
final int N = userIds.length;
for (int i = 0 ; i < N; ++i) {
disableNonexistentServices(userIds[i]);
}
}
private void disableNonexistentServices(int userId) {
String flatIn = Settings.Secure.getStringForUser(
mContext.getContentResolver(),
mConfig.secureSettingName,
userId);
if (!TextUtils.isEmpty(flatIn)) {
if (DEBUG) Slog.v(TAG, "flat before: " + flatIn);
PackageManager pm = mContext.getPackageManager();
List<ResolveInfo> installedServices = pm.queryIntentServicesAsUser(
new Intent(mConfig.serviceInterface),
PackageManager.GET_SERVICES | PackageManager.GET_META_DATA,
userId);
if (DEBUG) Slog.v(TAG, mConfig.serviceInterface + " services: " + installedServices);
Set<ComponentName> installed = new ArraySet<ComponentName>();
for (int i = 0, count = installedServices.size(); i < count; i++) {
ResolveInfo resolveInfo = installedServices.get(i);
ServiceInfo info = resolveInfo.serviceInfo;
if (!mConfig.bindPermission.equals(info.permission)) {
Slog.w(TAG, "Skipping " + getCaption() + " service "
+ info.packageName + "/" + info.name
+ ": it does not require the permission "
+ mConfig.bindPermission);
continue;
}
installed.add(new ComponentName(info.packageName, info.name));
}
String flatOut = "";
if (!installed.isEmpty()) {
String[] enabled = flatIn.split(ENABLED_SERVICES_SEPARATOR);
ArrayList<String> remaining = new ArrayList<String>(enabled.length);
for (int i = 0; i < enabled.length; i++) {
ComponentName enabledComponent = ComponentName.unflattenFromString(enabled[i]);
if (installed.contains(enabledComponent)) {
remaining.add(enabled[i]);
}
}
flatOut = TextUtils.join(ENABLED_SERVICES_SEPARATOR, remaining);
}
if (DEBUG) Slog.v(TAG, "flat after: " + flatOut);
if (!flatIn.equals(flatOut)) {
Settings.Secure.putStringForUser(mContext.getContentResolver(),
mConfig.secureSettingName,
flatOut, userId);
}
}
}
/**
* Called whenever packages change, the user switches, or the secure setting
* is altered. (For example in response to USER_SWITCHED in our broadcast receiver)
*/
private void rebindServices() {
if (DEBUG) Slog.d(TAG, "rebindServices");
final int[] userIds = mUserProfiles.getCurrentProfileIds();
final int nUserIds = userIds.length;
final SparseArray<String> flat = new SparseArray<String>();
for (int i = 0; i < nUserIds; ++i) {
flat.put(userIds[i], Settings.Secure.getStringForUser(
mContext.getContentResolver(),
mConfig.secureSettingName,
userIds[i]));
}
ArrayList<ManagedServiceInfo> toRemove = new ArrayList<ManagedServiceInfo>();
final SparseArray<ArrayList<ComponentName>> toAdd
= new SparseArray<ArrayList<ComponentName>>();
synchronized (mMutex) {
// Unbind automatically bound services, retain system services.
for (ManagedServiceInfo service : mServices) {
if (!service.isSystem) {
toRemove.add(service);
}
}
final ArraySet<ComponentName> newEnabled = new ArraySet<ComponentName>();
final ArraySet<String> newPackages = new ArraySet<String>();
for (int i = 0; i < nUserIds; ++i) {
final ArrayList<ComponentName> add = new ArrayList<ComponentName>();
toAdd.put(userIds[i], add);
// decode the list of components
String toDecode = flat.get(userIds[i]);
if (toDecode != null) {
String[] components = toDecode.split(ENABLED_SERVICES_SEPARATOR);
for (int j = 0; j < components.length; j++) {
final ComponentName component
= ComponentName.unflattenFromString(components[j]);
if (component != null) {
newEnabled.add(component);
add.add(component);
newPackages.add(component.getPackageName());
}
}
}
}
mEnabledServicesForCurrentProfiles = newEnabled;
mEnabledServicesPackageNames = newPackages;
}
for (ManagedServiceInfo info : toRemove) {
final ComponentName component = info.component;
final int oldUser = info.userid;
Slog.v(TAG, "disabling " + getCaption() + " for user "
+ oldUser + ": " + component);
unregisterService(component, info.userid);
}
for (int i = 0; i < nUserIds; ++i) {
final ArrayList<ComponentName> add = toAdd.get(userIds[i]);
final int N = add.size();
for (int j = 0; j < N; j++) {
final ComponentName component = add.get(j);
Slog.v(TAG, "enabling " + getCaption() + " for user " + userIds[i] + ": "
+ component);
registerService(component, userIds[i]);
}
}
mLastSeenProfileIds = mUserProfiles.getCurrentProfileIds();
}
/**
* Version of registerService that takes the name of a service component to bind to.
*/
private void registerService(final ComponentName name, final int userid) {
if (DEBUG) Slog.v(TAG, "registerService: " + name + " u=" + userid);
synchronized (mMutex) {
final String servicesBindingTag = name.toString() + "/" + userid;
if (mServicesBinding.contains(servicesBindingTag)) {
// stop registering this thing already! we're working on it
return;
}
mServicesBinding.add(servicesBindingTag);
final int N = mServices.size();
for (int i=N-1; i>=0; i--) {
final ManagedServiceInfo info = mServices.get(i);
if (name.equals(info.component)
&& info.userid == userid) {
// cut old connections
if (DEBUG) Slog.v(TAG, " disconnecting old " + getCaption() + ": "
+ info.service);
removeServiceLocked(i);
if (info.connection != null) {
mContext.unbindService(info.connection);
}
}
}
Intent intent = new Intent(mConfig.serviceInterface);
intent.setComponent(name);
intent.putExtra(Intent.EXTRA_CLIENT_LABEL, mConfig.clientLabel);
final PendingIntent pendingIntent = PendingIntent.getActivity(
mContext, 0, new Intent(mConfig.settingsAction), 0);
intent.putExtra(Intent.EXTRA_CLIENT_INTENT, pendingIntent);
ApplicationInfo appInfo = null;
try {
appInfo = mContext.getPackageManager().getApplicationInfo(
name.getPackageName(), 0);
} catch (NameNotFoundException e) {
// Ignore if the package doesn't exist we won't be able to bind to the service.
}
final int targetSdkVersion =
appInfo != null ? appInfo.targetSdkVersion : Build.VERSION_CODES.BASE;
try {
if (DEBUG) Slog.v(TAG, "binding: " + intent);
if (!mContext.bindServiceAsUser(intent,
new ServiceConnection() {
IInterface mService;
@Override
public void onServiceConnected(ComponentName name, IBinder binder) {
boolean added = false;
ManagedServiceInfo info = null;
synchronized (mMutex) {
mServicesBinding.remove(servicesBindingTag);
try {
mService = asInterface(binder);
info = newServiceInfo(mService, name,
userid, false /*isSystem*/, this, targetSdkVersion);
binder.linkToDeath(info, 0);
added = mServices.add(info);
} catch (RemoteException e) {
// already dead
}
}
if (added) {
onServiceAdded(info);
}
}
@Override
public void onServiceDisconnected(ComponentName name) {
Slog.v(TAG, getCaption() + " connection lost: " + name);
}
},
Context.BIND_AUTO_CREATE,
new UserHandle(userid)))
{
mServicesBinding.remove(servicesBindingTag);
Slog.w(TAG, "Unable to bind " + getCaption() + " service: " + intent);
return;
}
} catch (SecurityException ex) {
Slog.e(TAG, "Unable to bind " + getCaption() + " service: " + intent, ex);
return;
}
}
}
/**
* Remove a service for the given user by ComponentName
*/
private void unregisterService(ComponentName name, int userid) {
synchronized (mMutex) {
final int N = mServices.size();
for (int i=N-1; i>=0; i--) {
final ManagedServiceInfo info = mServices.get(i);
if (name.equals(info.component)
&& info.userid == userid) {
removeServiceLocked(i);
if (info.connection != null) {
try {
mContext.unbindService(info.connection);
} catch (IllegalArgumentException ex) {
// something happened to the service: we think we have a connection
// but it's bogus.
Slog.e(TAG, getCaption() + " " + name + " could not be unbound: " + ex);
}
}
}
}
}
}
/**
* Removes a service from the list but does not unbind
*
* @return the removed service.
*/
private ManagedServiceInfo removeServiceImpl(IInterface service, final int userid) {
if (DEBUG) Slog.d(TAG, "removeServiceImpl service=" + service + " u=" + userid);
ManagedServiceInfo serviceInfo = null;
synchronized (mMutex) {
final int N = mServices.size();
for (int i=N-1; i>=0; i--) {
final ManagedServiceInfo info = mServices.get(i);
if (info.service.asBinder() == service.asBinder()
&& info.userid == userid) {
if (DEBUG) Slog.d(TAG, "Removing active service " + info.component);
serviceInfo = removeServiceLocked(i);
}
}
}
return serviceInfo;
}
private ManagedServiceInfo removeServiceLocked(int i) {
final ManagedServiceInfo info = mServices.remove(i);
onServiceRemovedLocked(info);
return info;
}
private void checkNotNull(IInterface service) {
if (service == null) {
throw new IllegalArgumentException(getCaption() + " must not be null");
}
}
private ManagedServiceInfo registerServiceImpl(final IInterface service,
final ComponentName component, final int userid) {
synchronized (mMutex) {
try {
ManagedServiceInfo info = newServiceInfo(service, component, userid,
true /*isSystem*/, null, Build.VERSION_CODES.LOLLIPOP);
service.asBinder().linkToDeath(info, 0);
mServices.add(info);
return info;
} catch (RemoteException e) {
// already dead
}
}
return null;
}
/**
* Removes a service from the list and unbinds.
*/
private void unregisterServiceImpl(IInterface service, int userid) {
ManagedServiceInfo info = removeServiceImpl(service, userid);
if (info != null && info.connection != null) {
mContext.unbindService(info.connection);
}
}
private class SettingsObserver extends ContentObserver {
private final Uri mSecureSettingsUri = Settings.Secure.getUriFor(mConfig.secureSettingName);
private SettingsObserver(Handler handler) {
super(handler);
}
private void observe() {
ContentResolver resolver = mContext.getContentResolver();
resolver.registerContentObserver(mSecureSettingsUri,
false, this, UserHandle.USER_ALL);
update(null);
}
@Override
public void onChange(boolean selfChange, Uri uri) {
update(uri);
}
private void update(Uri uri) {
if (uri == null || mSecureSettingsUri.equals(uri)) {
if (DEBUG) Slog.d(TAG, "Setting changed: mSecureSettingsUri=" + mSecureSettingsUri +
" / uri=" + uri);
rebindServices();
}
}
}
public class ManagedServiceInfo implements IBinder.DeathRecipient {
public IInterface service;
public ComponentName component;
public int userid;
public boolean isSystem;
public ServiceConnection connection;
public int targetSdkVersion;
public ManagedServiceInfo(IInterface service, ComponentName component,
int userid, boolean isSystem, ServiceConnection connection, int targetSdkVersion) {
this.service = service;
this.component = component;
this.userid = userid;
this.isSystem = isSystem;
this.connection = connection;
this.targetSdkVersion = targetSdkVersion;
}
@Override
public String toString() {
return new StringBuilder("ManagedServiceInfo[")
.append("component=").append(component)
.append(",userid=").append(userid)
.append(",isSystem=").append(isSystem)
.append(",targetSdkVersion=").append(targetSdkVersion)
.append(",connection=").append(connection == null ? null : "<connection>")
.append(",service=").append(service)
.append(']').toString();
}
public boolean enabledAndUserMatches(int nid) {
if (!isEnabledForCurrentProfiles()) {
return false;
}
if (this.userid == UserHandle.USER_ALL) return true;
if (nid == UserHandle.USER_ALL || nid == this.userid) return true;
return supportsProfiles() && mUserProfiles.isCurrentProfile(nid);
}
public boolean supportsProfiles() {
return targetSdkVersion >= Build.VERSION_CODES.LOLLIPOP;
}
@Override
public void binderDied() {
if (DEBUG) Slog.d(TAG, "binderDied");
// Remove the service, but don't unbind from the service. The system will bring the
// service back up, and the onServiceConnected handler will readd the service with the
// new binding. If this isn't a bound service, and is just a registered
// service, just removing it from the list is all we need to do anyway.
removeServiceImpl(this.service, this.userid);
}
/** convenience method for looking in mEnabledServicesForCurrentProfiles */
public boolean isEnabledForCurrentProfiles() {
if (this.isSystem) return true;
if (this.connection == null) return false;
return mEnabledServicesForCurrentProfiles.contains(this.component);
}
}
public static class UserProfiles {
// Profiles of the current user.
private final SparseArray<UserInfo> mCurrentProfiles = new SparseArray<UserInfo>();
public void updateCache(Context context) {
UserManager userManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
if (userManager != null) {
int currentUserId = ActivityManager.getCurrentUser();
List<UserInfo> profiles = userManager.getProfiles(currentUserId);
synchronized (mCurrentProfiles) {
mCurrentProfiles.clear();
for (UserInfo user : profiles) {
mCurrentProfiles.put(user.id, user);
}
}
}
}
public int[] getCurrentProfileIds() {
synchronized (mCurrentProfiles) {
int[] users = new int[mCurrentProfiles.size()];
final int N = mCurrentProfiles.size();
for (int i = 0; i < N; ++i) {
users[i] = mCurrentProfiles.keyAt(i);
}
return users;
}
}
public boolean isCurrentProfile(int userId) {
synchronized (mCurrentProfiles) {
return mCurrentProfiles.get(userId) != null;
}
}
}
protected static class Config {
String caption;
String serviceInterface;
String secureSettingName;
String bindPermission;
String settingsAction;
int clientLabel;
}
}
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