/**
* 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.Notification;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Handler;
import android.os.Message;
import android.os.UserHandle;
import android.service.notification.NotificationListenerService;
import android.text.TextUtils;
import android.util.ArrayMap;
import android.util.Slog;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
public class RankingHelper implements RankingConfig {
private static final String TAG = "RankingHelper";
private static final int XML_VERSION = 1;
private static final String TAG_RANKING = "ranking";
private static final String TAG_PACKAGE = "package";
private static final String ATT_VERSION = "version";
private static final String ATT_NAME = "name";
private static final String ATT_UID = "uid";
private static final String ATT_PRIORITY = "priority";
private static final String ATT_PEEKABLE = "peekable";
private static final String ATT_VISIBILITY = "visibility";
private static final int DEFAULT_PRIORITY = Notification.PRIORITY_DEFAULT;
private static final boolean DEFAULT_PEEKABLE = true;
private static final int DEFAULT_VISIBILITY =
NotificationListenerService.Ranking.VISIBILITY_NO_OVERRIDE;
private final NotificationSignalExtractor[] mSignalExtractors;
private final NotificationComparator mPreliminaryComparator = new NotificationComparator();
private final GlobalSortKeyComparator mFinalComparator = new GlobalSortKeyComparator();
private final ArrayMap<String, Record> mRecords = new ArrayMap<>(); // pkg|uid => Record
private final ArrayMap<String, NotificationRecord> mProxyByGroupTmp = new ArrayMap<>();
private final ArrayMap<String, Record> mRestoredWithoutUids = new ArrayMap<>(); // pkg => Record
private final Context mContext;
private final Handler mRankingHandler;
public RankingHelper(Context context, Handler rankingHandler, NotificationUsageStats usageStats,
String[] extractorNames) {
mContext = context;
mRankingHandler = rankingHandler;
final int N = extractorNames.length;
mSignalExtractors = new NotificationSignalExtractor[N];
for (int i = 0; i < N; i++) {
try {
Class<?> extractorClass = mContext.getClassLoader().loadClass(extractorNames[i]);
NotificationSignalExtractor extractor =
(NotificationSignalExtractor) extractorClass.newInstance();
extractor.initialize(mContext, usageStats);
extractor.setConfig(this);
mSignalExtractors[i] = extractor;
} catch (ClassNotFoundException e) {
Slog.w(TAG, "Couldn't find extractor " + extractorNames[i] + ".", e);
} catch (InstantiationException e) {
Slog.w(TAG, "Couldn't instantiate extractor " + extractorNames[i] + ".", e);
} catch (IllegalAccessException e) {
Slog.w(TAG, "Problem accessing extractor " + extractorNames[i] + ".", e);
}
}
}
@SuppressWarnings("unchecked")
public <T extends NotificationSignalExtractor> T findExtractor(Class<T> extractorClass) {
final int N = mSignalExtractors.length;
for (int i = 0; i < N; i++) {
final NotificationSignalExtractor extractor = mSignalExtractors[i];
if (extractorClass.equals(extractor.getClass())) {
return (T) extractor;
}
}
return null;
}
public void extractSignals(NotificationRecord r) {
final int N = mSignalExtractors.length;
for (int i = 0; i < N; i++) {
NotificationSignalExtractor extractor = mSignalExtractors[i];
try {
RankingReconsideration recon = extractor.process(r);
if (recon != null) {
Message m = Message.obtain(mRankingHandler,
NotificationManagerService.MESSAGE_RECONSIDER_RANKING, recon);
long delay = recon.getDelay(TimeUnit.MILLISECONDS);
mRankingHandler.sendMessageDelayed(m, delay);
}
} catch (Throwable t) {
Slog.w(TAG, "NotificationSignalExtractor failed.", t);
}
}
}
public void readXml(XmlPullParser parser, boolean forRestore)
throws XmlPullParserException, IOException {
final PackageManager pm = mContext.getPackageManager();
int type = parser.getEventType();
if (type != XmlPullParser.START_TAG) return;
String tag = parser.getName();
if (!TAG_RANKING.equals(tag)) return;
mRecords.clear();
mRestoredWithoutUids.clear();
while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) {
tag = parser.getName();
if (type == XmlPullParser.END_TAG && TAG_RANKING.equals(tag)) {
return;
}
if (type == XmlPullParser.START_TAG) {
if (TAG_PACKAGE.equals(tag)) {
int uid = safeInt(parser, ATT_UID, Record.UNKNOWN_UID);
int priority = safeInt(parser, ATT_PRIORITY, DEFAULT_PRIORITY);
boolean peekable = safeBool(parser, ATT_PEEKABLE, DEFAULT_PEEKABLE);
int vis = safeInt(parser, ATT_VISIBILITY, DEFAULT_VISIBILITY);
String name = parser.getAttributeValue(null, ATT_NAME);
if (!TextUtils.isEmpty(name)) {
if (forRestore) {
try {
uid = pm.getPackageUid(name, UserHandle.USER_OWNER);
} catch (NameNotFoundException e) {
// noop
}
}
Record r = null;
if (uid == Record.UNKNOWN_UID) {
r = mRestoredWithoutUids.get(name);
if (r == null) {
r = new Record();
mRestoredWithoutUids.put(name, r);
}
} else {
r = getOrCreateRecord(name, uid);
}
if (priority != DEFAULT_PRIORITY) {
r.priority = priority;
}
if (peekable != DEFAULT_PEEKABLE) {
r.peekable = peekable;
}
if (vis != DEFAULT_VISIBILITY) {
r.visibility = vis;
}
}
}
}
}
throw new IllegalStateException("Failed to reach END_DOCUMENT");
}
private static String recordKey(String pkg, int uid) {
return pkg + "|" + uid;
}
private Record getOrCreateRecord(String pkg, int uid) {
final String key = recordKey(pkg, uid);
Record r = mRecords.get(key);
if (r == null) {
r = new Record();
r.pkg = pkg;
r.uid = uid;
mRecords.put(key, r);
}
return r;
}
private void removeDefaultRecords() {
final int N = mRecords.size();
for (int i = N - 1; i >= 0; i--) {
final Record r = mRecords.valueAt(i);
if (r.priority == DEFAULT_PRIORITY && r.peekable == DEFAULT_PEEKABLE
&& r.visibility == DEFAULT_VISIBILITY) {
mRecords.remove(i);
}
}
}
public void writeXml(XmlSerializer out, boolean forBackup) throws IOException {
out.startTag(null, TAG_RANKING);
out.attribute(null, ATT_VERSION, Integer.toString(XML_VERSION));
final int N = mRecords.size();
for (int i = 0; i < N; i++) {
final Record r = mRecords.valueAt(i);
if (forBackup && UserHandle.getUserId(r.uid) != UserHandle.USER_OWNER) {
continue;
}
out.startTag(null, TAG_PACKAGE);
out.attribute(null, ATT_NAME, r.pkg);
if (r.priority != DEFAULT_PRIORITY) {
out.attribute(null, ATT_PRIORITY, Integer.toString(r.priority));
}
if (r.peekable != DEFAULT_PEEKABLE) {
out.attribute(null, ATT_PEEKABLE, Boolean.toString(r.peekable));
}
if (r.visibility != DEFAULT_VISIBILITY) {
out.attribute(null, ATT_VISIBILITY, Integer.toString(r.visibility));
}
if (!forBackup) {
out.attribute(null, ATT_UID, Integer.toString(r.uid));
}
out.endTag(null, TAG_PACKAGE);
}
out.endTag(null, TAG_RANKING);
}
private void updateConfig() {
final int N = mSignalExtractors.length;
for (int i = 0; i < N; i++) {
mSignalExtractors[i].setConfig(this);
}
mRankingHandler.sendEmptyMessage(NotificationManagerService.MESSAGE_RANKING_CONFIG_CHANGE);
}
public void sort(ArrayList<NotificationRecord> notificationList) {
final int N = notificationList.size();
// clear global sort keys
for (int i = N - 1; i >= 0; i--) {
notificationList.get(i).setGlobalSortKey(null);
}
// rank each record individually
Collections.sort(notificationList, mPreliminaryComparator);
synchronized (mProxyByGroupTmp) {
// record individual ranking result and nominate proxies for each group
for (int i = N - 1; i >= 0; i--) {
final NotificationRecord record = notificationList.get(i);
record.setAuthoritativeRank(i);
final String groupKey = record.getGroupKey();
boolean isGroupSummary = record.getNotification().isGroupSummary();
if (isGroupSummary || !mProxyByGroupTmp.containsKey(groupKey)) {
mProxyByGroupTmp.put(groupKey, record);
}
}
// assign global sort key:
// is_recently_intrusive:group_rank:is_group_summary:group_sort_key:rank
for (int i = 0; i < N; i++) {
final NotificationRecord record = notificationList.get(i);
NotificationRecord groupProxy = mProxyByGroupTmp.get(record.getGroupKey());
String groupSortKey = record.getNotification().getSortKey();
// We need to make sure the developer provided group sort key (gsk) is handled
// correctly:
// gsk="" < gsk=non-null-string < gsk=null
//
// We enforce this by using different prefixes for these three cases.
String groupSortKeyPortion;
if (groupSortKey == null) {
groupSortKeyPortion = "nsk";
} else if (groupSortKey.equals("")) {
groupSortKeyPortion = "esk";
} else {
groupSortKeyPortion = "gsk=" + groupSortKey;
}
boolean isGroupSummary = record.getNotification().isGroupSummary();
record.setGlobalSortKey(
String.format("intrsv=%c:grnk=0x%04x:gsmry=%c:%s:rnk=0x%04x",
record.isRecentlyIntrusive() ? '0' : '1',
groupProxy.getAuthoritativeRank(),
isGroupSummary ? '0' : '1',
groupSortKeyPortion,
record.getAuthoritativeRank()));
}
mProxyByGroupTmp.clear();
}
// Do a second ranking pass, using group proxies
Collections.sort(notificationList, mFinalComparator);
}
public int indexOf(ArrayList<NotificationRecord> notificationList, NotificationRecord target) {
return Collections.binarySearch(notificationList, target, mFinalComparator);
}
private static int safeInt(XmlPullParser parser, String att, int defValue) {
final String val = parser.getAttributeValue(null, att);
return tryParseInt(val, defValue);
}
private static int tryParseInt(String value, int defValue) {
if (TextUtils.isEmpty(value)) return defValue;
try {
return Integer.valueOf(value);
} catch (NumberFormatException e) {
return defValue;
}
}
private static boolean safeBool(XmlPullParser parser, String att, boolean defValue) {
final String val = parser.getAttributeValue(null, att);
return tryParseBool(val, defValue);
}
private static boolean tryParseBool(String value, boolean defValue) {
if (TextUtils.isEmpty(value)) return defValue;
return Boolean.valueOf(value);
}
@Override
public int getPackagePriority(String packageName, int uid) {
final Record r = mRecords.get(recordKey(packageName, uid));
return r != null ? r.priority : DEFAULT_PRIORITY;
}
@Override
public void setPackagePriority(String packageName, int uid, int priority) {
if (priority == getPackagePriority(packageName, uid)) {
return;
}
getOrCreateRecord(packageName, uid).priority = priority;
removeDefaultRecords();
updateConfig();
}
@Override
public boolean getPackagePeekable(String packageName, int uid) {
final Record r = mRecords.get(recordKey(packageName, uid));
return r != null ? r.peekable : DEFAULT_PEEKABLE;
}
@Override
public void setPackagePeekable(String packageName, int uid, boolean peekable) {
if (peekable == getPackagePeekable(packageName, uid)) {
return;
}
getOrCreateRecord(packageName, uid).peekable = peekable;
removeDefaultRecords();
updateConfig();
}
@Override
public int getPackageVisibilityOverride(String packageName, int uid) {
final Record r = mRecords.get(recordKey(packageName, uid));
return r != null ? r.visibility : DEFAULT_VISIBILITY;
}
@Override
public void setPackageVisibilityOverride(String packageName, int uid, int visibility) {
if (visibility == getPackageVisibilityOverride(packageName, uid)) {
return;
}
getOrCreateRecord(packageName, uid).visibility = visibility;
removeDefaultRecords();
updateConfig();
}
public void dump(PrintWriter pw, String prefix, NotificationManagerService.DumpFilter filter) {
if (filter == null) {
final int N = mSignalExtractors.length;
pw.print(prefix);
pw.print("mSignalExtractors.length = ");
pw.println(N);
for (int i = 0; i < N; i++) {
pw.print(prefix);
pw.print(" ");
pw.println(mSignalExtractors[i]);
}
}
if (filter == null) {
pw.print(prefix);
pw.println("per-package config:");
}
dumpRecords(pw, prefix, filter, mRecords);
dumpRecords(pw, prefix, filter, mRestoredWithoutUids);
}
private static void dumpRecords(PrintWriter pw, String prefix,
NotificationManagerService.DumpFilter filter, ArrayMap<String, Record> records) {
final int N = records.size();
for (int i = 0; i < N; i++) {
final Record r = records.valueAt(i);
if (filter == null || filter.matches(r.pkg)) {
pw.print(prefix);
pw.print(" ");
pw.print(r.pkg);
pw.print(" (");
pw.print(r.uid == Record.UNKNOWN_UID ? "UNKNOWN_UID" : Integer.toString(r.uid));
pw.print(')');
if (r.priority != DEFAULT_PRIORITY) {
pw.print(" priority=");
pw.print(Notification.priorityToString(r.priority));
}
if (r.peekable != DEFAULT_PEEKABLE) {
pw.print(" peekable=");
pw.print(r.peekable);
}
if (r.visibility != DEFAULT_VISIBILITY) {
pw.print(" visibility=");
pw.print(Notification.visibilityToString(r.visibility));
}
pw.println();
}
}
}
public void onPackagesChanged(boolean queryReplace, String[] pkgList) {
if (queryReplace || pkgList == null || pkgList.length == 0
|| mRestoredWithoutUids.isEmpty()) {
return; // nothing to do
}
final PackageManager pm = mContext.getPackageManager();
boolean updated = false;
for (String pkg : pkgList) {
final Record r = mRestoredWithoutUids.get(pkg);
if (r != null) {
try {
r.uid = pm.getPackageUid(r.pkg, UserHandle.USER_OWNER);
mRestoredWithoutUids.remove(pkg);
mRecords.put(recordKey(r.pkg, r.uid), r);
updated = true;
} catch (NameNotFoundException e) {
// noop
}
}
}
if (updated) {
updateConfig();
}
}
private static class Record {
static int UNKNOWN_UID = UserHandle.USER_NULL;
String pkg;
int uid = UNKNOWN_UID;
int priority = DEFAULT_PRIORITY;
boolean peekable = DEFAULT_PEEKABLE;
int visibility = DEFAULT_VISIBILITY;
}
}