/*
* Copyright (C) 2008 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;
import static android.os.FileObserver.*;
import static android.os.ParcelFileDescriptor.*;
import android.app.IWallpaperManager;
import android.app.IWallpaperManagerCallback;
import android.app.PendingIntent;
import android.app.WallpaperInfo;
import android.backup.BackupManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.FileObserver;
import android.os.ParcelFileDescriptor;
import android.os.RemoteCallbackList;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.service.wallpaper.IWallpaperConnection;
import android.service.wallpaper.IWallpaperEngine;
import android.service.wallpaper.IWallpaperService;
import android.service.wallpaper.WallpaperService;
import android.util.Log;
import android.util.Xml;
import android.view.IWindowManager;
import android.view.WindowManager;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;
import com.android.internal.service.wallpaper.ImageWallpaper;
import com.android.internal.util.FastXmlSerializer;
class WallpaperManagerService extends IWallpaperManager.Stub {
static final String TAG = "WallpaperService";
static final boolean DEBUG = false;
Object mLock = new Object();
/**
* Minimum time between crashes of a wallpaper service for us to consider
* restarting it vs. just reverting to the static wallpaper.
*/
static final long MIN_WALLPAPER_CRASH_TIME = 10000;
static final File WALLPAPER_DIR = new File(
"/data/data/com.android.settings/files");
static final String WALLPAPER = "wallpaper";
static final File WALLPAPER_FILE = new File(WALLPAPER_DIR, WALLPAPER);
/**
* List of callbacks registered they should each be notified
* when the wallpaper is changed.
*/
private final RemoteCallbackList<IWallpaperManagerCallback> mCallbacks
= new RemoteCallbackList<IWallpaperManagerCallback>();
/**
* Observes the wallpaper for changes and notifies all IWallpaperServiceCallbacks
* that the wallpaper has changed. The CREATE is triggered when there is no
* wallpaper set and is created for the first time. The CLOSE_WRITE is triggered
* everytime the wallpaper is changed.
*/
private final FileObserver mWallpaperObserver = new FileObserver(
WALLPAPER_DIR.getAbsolutePath(), CREATE | CLOSE_WRITE | DELETE | DELETE_SELF) {
@Override
public void onEvent(int event, String path) {
if (path == null) {
return;
}
synchronized (mLock) {
// changing the wallpaper means we'll need to back up the new one
long origId = Binder.clearCallingIdentity();
BackupManager bm = new BackupManager(mContext);
bm.dataChanged();
Binder.restoreCallingIdentity(origId);
File changedFile = new File(WALLPAPER_DIR, path);
if (WALLPAPER_FILE.equals(changedFile)) {
notifyCallbacksLocked();
}
}
}
};
final Context mContext;
final IWindowManager mIWindowManager;
int mWidth = -1;
int mHeight = -1;
String mName = "";
ComponentName mWallpaperComponent;
WallpaperConnection mWallpaperConnection;
long mLastDiedTime;
class WallpaperConnection extends IWallpaperConnection.Stub
implements ServiceConnection {
final WallpaperInfo mInfo;
final Binder mToken = new Binder();
IWallpaperService mService;
IWallpaperEngine mEngine;
public WallpaperConnection(WallpaperInfo info) {
mInfo = info;
}
public void onServiceConnected(ComponentName name, IBinder service) {
synchronized (mLock) {
if (mWallpaperConnection == this) {
mService = IWallpaperService.Stub.asInterface(service);
attachServiceLocked(this);
// XXX should probably do saveSettingsLocked() later
// when we have an engine, but I'm not sure about
// locking there and anyway we always need to be able to
// recover if there is something wrong.
saveSettingsLocked();
}
}
}
public void onServiceDisconnected(ComponentName name) {
synchronized (mLock) {
mService = null;
mEngine = null;
if (mWallpaperConnection == this) {
Log.w(TAG, "Wallpaper service gone: " + mWallpaperComponent);
if ((mLastDiedTime+MIN_WALLPAPER_CRASH_TIME)
< SystemClock.uptimeMillis()) {
Log.w(TAG, "Reverting to built-in wallpaper!");
bindWallpaperComponentLocked(null);
}
}
}
}
public void attachEngine(IWallpaperEngine engine) {
mEngine = engine;
}
public ParcelFileDescriptor setWallpaper(String name) {
synchronized (mLock) {
if (mWallpaperConnection == this) {
return updateWallpaperBitmapLocked(name);
}
return null;
}
}
}
public WallpaperManagerService(Context context) {
if (DEBUG) Log.d(TAG, "WallpaperService startup");
mContext = context;
mIWindowManager = IWindowManager.Stub.asInterface(
ServiceManager.getService(Context.WINDOW_SERVICE));
WALLPAPER_DIR.mkdirs();
loadSettingsLocked();
mWallpaperObserver.startWatching();
}
@Override
protected void finalize() throws Throwable {
super.finalize();
mWallpaperObserver.stopWatching();
}
public void systemReady() {
synchronized (mLock) {
try {
bindWallpaperComponentLocked(mWallpaperComponent);
} catch (RuntimeException e) {
Log.w(TAG, "Failure starting previous wallpaper", e);
try {
bindWallpaperComponentLocked(null);
} catch (RuntimeException e2) {
Log.w(TAG, "Failure starting default wallpaper", e2);
clearWallpaperComponentLocked();
}
}
}
}
public void clearWallpaper() {
synchronized (mLock) {
File f = WALLPAPER_FILE;
if (f.exists()) {
f.delete();
}
final long ident = Binder.clearCallingIdentity();
try {
bindWallpaperComponentLocked(null);
} finally {
Binder.restoreCallingIdentity(ident);
}
}
}
public void setDimensionHints(int width, int height) throws RemoteException {
checkPermission(android.Manifest.permission.SET_WALLPAPER_HINTS);
if (width <= 0 || height <= 0) {
throw new IllegalArgumentException("width and height must be > 0");
}
synchronized (mLock) {
if (width != mWidth || height != mHeight) {
mWidth = width;
mHeight = height;
saveSettingsLocked();
if (mWallpaperConnection != null) {
if (mWallpaperConnection.mEngine != null) {
try {
mWallpaperConnection.mEngine.setDesiredSize(
width, height);
} catch (RemoteException e) {
}
notifyCallbacksLocked();
}
}
}
}
}
public int getWidthHint() throws RemoteException {
synchronized (mLock) {
return mWidth;
}
}
public int getHeightHint() throws RemoteException {
synchronized (mLock) {
return mHeight;
}
}
public ParcelFileDescriptor getWallpaper(IWallpaperManagerCallback cb,
Bundle outParams) {
synchronized (mLock) {
try {
if (outParams != null) {
outParams.putInt("width", mWidth);
outParams.putInt("height", mHeight);
}
mCallbacks.register(cb);
File f = WALLPAPER_FILE;
if (!f.exists()) {
return null;
}
return ParcelFileDescriptor.open(f, MODE_READ_ONLY);
} catch (FileNotFoundException e) {
/* Shouldn't happen as we check to see if the file exists */
Log.w(TAG, "Error getting wallpaper", e);
}
return null;
}
}
public WallpaperInfo getWallpaperInfo() {
synchronized (mLock) {
if (mWallpaperConnection != null) {
return mWallpaperConnection.mInfo;
}
return null;
}
}
public ParcelFileDescriptor setWallpaper(String name) {
checkPermission(android.Manifest.permission.SET_WALLPAPER);
synchronized (mLock) {
final long ident = Binder.clearCallingIdentity();
try {
ParcelFileDescriptor pfd = updateWallpaperBitmapLocked(name);
if (pfd != null) {
bindWallpaperComponentLocked(null);
saveSettingsLocked();
}
return pfd;
} finally {
Binder.restoreCallingIdentity(ident);
}
}
}
ParcelFileDescriptor updateWallpaperBitmapLocked(String name) {
if (name == null) name = "";
try {
ParcelFileDescriptor fd = ParcelFileDescriptor.open(WALLPAPER_FILE,
MODE_CREATE|MODE_READ_WRITE);
mName = name;
return fd;
} catch (FileNotFoundException e) {
Log.w(TAG, "Error setting wallpaper", e);
}
return null;
}
public void setWallpaperComponent(ComponentName name) {
checkPermission(android.Manifest.permission.SET_WALLPAPER_COMPONENT);
synchronized (mLock) {
final long ident = Binder.clearCallingIdentity();
try {
bindWallpaperComponentLocked(name);
} finally {
Binder.restoreCallingIdentity(ident);
}
}
}
void bindWallpaperComponentLocked(ComponentName name) {
// Has the component changed?
if (mWallpaperConnection != null) {
if (mWallpaperComponent == null) {
if (name == null) {
// Still using default wallpaper.
return;
}
} else if (mWallpaperComponent.equals(name)) {
// Changing to same wallpaper.
return;
}
}
try {
ComponentName realName = name;
if (realName == null) {
// The default component is our static image wallpaper.
realName = new ComponentName("android",
ImageWallpaper.class.getName());
//clearWallpaperComponentLocked();
//return;
}
ServiceInfo si = mContext.getPackageManager().getServiceInfo(realName,
PackageManager.GET_META_DATA | PackageManager.GET_PERMISSIONS);
if (!android.Manifest.permission.BIND_WALLPAPER.equals(si.permission)) {
throw new SecurityException("Selected service does not require "
+ android.Manifest.permission.BIND_WALLPAPER
+ ": " + realName);
}
WallpaperInfo wi = null;
Intent intent = new Intent(WallpaperService.SERVICE_INTERFACE);
if (name != null) {
// Make sure the selected service is actually a wallpaper service.
List<ResolveInfo> ris = mContext.getPackageManager()
.queryIntentServices(intent, PackageManager.GET_META_DATA);
for (int i=0; i<ris.size(); i++) {
ServiceInfo rsi = ris.get(i).serviceInfo;
if (rsi.name.equals(si.name) &&
rsi.packageName.equals(si.packageName)) {
try {
wi = new WallpaperInfo(mContext, ris.get(i));
} catch (XmlPullParserException e) {
throw new IllegalArgumentException(e);
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
break;
}
}
if (wi == null) {
throw new SecurityException("Selected service is not a wallpaper: "
+ realName);
}
}
// Bind the service!
WallpaperConnection newConn = new WallpaperConnection(wi);
intent.setComponent(realName);
intent.putExtra(Intent.EXTRA_CLIENT_LABEL,
com.android.internal.R.string.wallpaper_binding_label);
intent.putExtra(Intent.EXTRA_CLIENT_INTENT, PendingIntent.getActivity(
mContext, 0,
Intent.createChooser(new Intent(Intent.ACTION_SET_WALLPAPER),
mContext.getText(com.android.internal.R.string.chooser_wallpaper)),
0));
if (!mContext.bindService(intent, newConn,
Context.BIND_AUTO_CREATE)) {
throw new IllegalArgumentException("Unable to bind service: "
+ name);
}
clearWallpaperComponentLocked();
mWallpaperComponent = name;
mWallpaperConnection = newConn;
mLastDiedTime = SystemClock.uptimeMillis();
try {
if (DEBUG) Log.v(TAG, "Adding window token: " + newConn.mToken);
mIWindowManager.addWindowToken(newConn.mToken,
WindowManager.LayoutParams.TYPE_WALLPAPER);
} catch (RemoteException e) {
}
} catch (PackageManager.NameNotFoundException e) {
throw new IllegalArgumentException("Unknown component " + name);
}
}
void clearWallpaperComponentLocked() {
mWallpaperComponent = null;
if (mWallpaperConnection != null) {
if (mWallpaperConnection.mEngine != null) {
try {
mWallpaperConnection.mEngine.destroy();
} catch (RemoteException e) {
}
}
mContext.unbindService(mWallpaperConnection);
try {
if (DEBUG) Log.v(TAG, "Removing window token: "
+ mWallpaperConnection.mToken);
mIWindowManager.removeWindowToken(mWallpaperConnection.mToken);
} catch (RemoteException e) {
}
mWallpaperConnection = null;
}
}
void attachServiceLocked(WallpaperConnection conn) {
try {
conn.mService.attach(conn, conn.mToken,
WindowManager.LayoutParams.TYPE_WALLPAPER, false,
mWidth, mHeight);
} catch (RemoteException e) {
Log.w(TAG, "Failed attaching wallpaper; clearing", e);
bindWallpaperComponentLocked(null);
}
}
private void notifyCallbacksLocked() {
final int n = mCallbacks.beginBroadcast();
for (int i = 0; i < n; i++) {
try {
mCallbacks.getBroadcastItem(i).onWallpaperChanged();
} catch (RemoteException e) {
// The RemoteCallbackList will take care of removing
// the dead object for us.
}
}
mCallbacks.finishBroadcast();
final Intent intent = new Intent(Intent.ACTION_WALLPAPER_CHANGED);
mContext.sendBroadcast(intent);
}
private void checkPermission(String permission) {
if (PackageManager.PERMISSION_GRANTED!= mContext.checkCallingOrSelfPermission(permission)) {
throw new SecurityException("Access denied to process: " + Binder.getCallingPid()
+ ", must have permission " + permission);
}
}
private static JournaledFile makeJournaledFile() {
final String base = "/data/system/wallpaper_info.xml";
return new JournaledFile(new File(base), new File(base + ".tmp"));
}
private void saveSettingsLocked() {
JournaledFile journal = makeJournaledFile();
FileOutputStream stream = null;
try {
stream = new FileOutputStream(journal.chooseForWrite(), false);
XmlSerializer out = new FastXmlSerializer();
out.setOutput(stream, "utf-8");
out.startDocument(null, true);
out.startTag(null, "wp");
out.attribute(null, "width", Integer.toString(mWidth));
out.attribute(null, "height", Integer.toString(mHeight));
out.attribute(null, "name", mName);
if (mWallpaperComponent != null) {
out.attribute(null, "component",
mWallpaperComponent.flattenToShortString());
}
out.endTag(null, "wp");
out.endDocument();
stream.close();
journal.commit();
} catch (IOException e) {
try {
if (stream != null) {
stream.close();
}
} catch (IOException ex) {
// Ignore
}
journal.rollback();
}
}
private void loadSettingsLocked() {
JournaledFile journal = makeJournaledFile();
FileInputStream stream = null;
File file = journal.chooseForRead();
boolean success = false;
try {
stream = new FileInputStream(file);
XmlPullParser parser = Xml.newPullParser();
parser.setInput(stream, null);
int type;
do {
type = parser.next();
if (type == XmlPullParser.START_TAG) {
String tag = parser.getName();
if ("wp".equals(tag)) {
mWidth = Integer.parseInt(parser.getAttributeValue(null, "width"));
mHeight = Integer.parseInt(parser.getAttributeValue(null, "height"));
mName = parser.getAttributeValue(null, "name");
String comp = parser.getAttributeValue(null, "component");
mWallpaperComponent = comp != null
? ComponentName.unflattenFromString(comp)
: null;
}
}
} while (type != XmlPullParser.END_DOCUMENT);
success = true;
} catch (NullPointerException e) {
Log.w(TAG, "failed parsing " + file + " " + e);
} catch (NumberFormatException e) {
Log.w(TAG, "failed parsing " + file + " " + e);
} catch (XmlPullParserException e) {
Log.w(TAG, "failed parsing " + file + " " + e);
} catch (IOException e) {
Log.w(TAG, "failed parsing " + file + " " + e);
} catch (IndexOutOfBoundsException e) {
Log.w(TAG, "failed parsing " + file + " " + e);
}
try {
if (stream != null) {
stream.close();
}
} catch (IOException e) {
// Ignore
}
if (!success) {
mWidth = -1;
mHeight = -1;
mName = "";
}
}
void settingsRestored() {
boolean success = false;
synchronized (mLock) {
loadSettingsLocked();
// If there's a wallpaper name, we use that. If that can't be loaded, then we
// use the default.
if ("".equals(mName)) {
success = true;
} else {
success = restoreNamedResourceLocked();
}
}
if (!success) {
Log.e(TAG, "Failed to restore wallpaper: '" + mName + "'");
mName = "";
WALLPAPER_FILE.delete();
}
saveSettingsLocked();
}
boolean restoreNamedResourceLocked() {
if (mName.length() > 4 && "res:".equals(mName.substring(0, 4))) {
String resName = mName.substring(4);
String pkg = null;
int colon = resName.indexOf(':');
if (colon > 0) {
pkg = resName.substring(0, colon);
}
String ident = null;
int slash = resName.lastIndexOf('/');
if (slash > 0) {
ident = resName.substring(slash+1);
}
String type = null;
if (colon > 0 && slash > 0 && (slash-colon) > 1) {
type = resName.substring(colon+1, slash);
}
if (pkg != null && ident != null && type != null) {
int resId = -1;
InputStream res = null;
FileOutputStream fos = null;
try {
Context c = mContext.createPackageContext(pkg, Context.CONTEXT_RESTRICTED);
Resources r = c.getResources();
resId = r.getIdentifier(resName, null, null);
if (resId == 0) {
Log.e(TAG, "couldn't resolve identifier pkg=" + pkg + " type=" + type
+ " ident=" + ident);
return false;
}
res = r.openRawResource(resId);
fos = new FileOutputStream(WALLPAPER_FILE);
byte[] buffer = new byte[32768];
int amt;
while ((amt=res.read(buffer)) > 0) {
fos.write(buffer, 0, amt);
}
// mWallpaperObserver will notice the close and send the change broadcast
Log.d(TAG, "Restored wallpaper: " + resName);
return true;
} catch (NameNotFoundException e) {
Log.e(TAG, "Package name " + pkg + " not found");
} catch (Resources.NotFoundException e) {
Log.e(TAG, "Resource not found: " + resId);
} catch (IOException e) {
Log.e(TAG, "IOException while restoring wallpaper ", e);
} finally {
if (res != null) {
try {
res.close();
} catch (IOException ex) {}
}
if (fos != null) {
try {
fos.close();
} catch (IOException ex) {}
}
}
}
}
return false;
}
@Override
protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
!= PackageManager.PERMISSION_GRANTED) {
pw.println("Permission Denial: can't dump wallpaper service from from pid="
+ Binder.getCallingPid()
+ ", uid=" + Binder.getCallingUid());
return;
}
synchronized (mLock) {
pw.println("Current Wallpaper Service state:");
pw.print(" mWidth="); pw.print(mWidth);
pw.print(" mHeight="); pw.println(mHeight);
pw.print(" mName="); pw.println(mName);
pw.print(" mWallpaperComponent="); pw.println(mWallpaperComponent);
if (mWallpaperConnection != null) {
WallpaperConnection conn = mWallpaperConnection;
pw.print(" Wallpaper connection ");
pw.print(conn); pw.println(":");
pw.print(" mInfo.component="); pw.println(conn.mInfo.getComponent());
pw.print(" mToken="); pw.println(conn.mToken);
pw.print(" mService="); pw.println(conn.mService);
pw.print(" mEngine="); pw.println(conn.mEngine);
pw.print(" mLastDiedTime=");
pw.println(mLastDiedTime - SystemClock.uptimeMillis());
}
}
}
}