1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.app;
18
19import android.annotation.SystemApi;
20import android.app.Service;
21import android.content.Context;
22import android.content.Intent;
23import android.content.pm.InstantAppResolveInfo;
24import android.os.Build;
25import android.os.Bundle;
26import android.os.Handler;
27import android.os.IBinder;
28import android.os.IRemoteCallback;
29import android.os.Looper;
30import android.os.Message;
31import android.os.RemoteException;
32import android.util.Log;
33import android.util.Slog;
34
35import com.android.internal.os.SomeArgs;
36
37import java.util.Arrays;
38import java.util.List;
39
40/**
41 * Base class for implementing the resolver service.
42 * @hide
43 */
44@SystemApi
45public abstract class InstantAppResolverService extends Service {
46    private static final boolean DEBUG_EPHEMERAL = Build.IS_DEBUGGABLE;
47    private static final String TAG = "PackageManager";
48
49    /** @hide */
50    public static final String EXTRA_RESOLVE_INFO = "android.app.extra.RESOLVE_INFO";
51    /** @hide */
52    public static final String EXTRA_SEQUENCE = "android.app.extra.SEQUENCE";
53    Handler mHandler;
54
55    /**
56     * Called to retrieve resolve info for instant applications.
57     *
58     * @param digestPrefix The hash prefix of the instant app's domain.
59     */
60    public void onGetInstantAppResolveInfo(
61            int digestPrefix[], String token, InstantAppResolutionCallback callback) {
62        throw new IllegalStateException("Must define");
63    }
64
65    /**
66     * Called to retrieve intent filters for instant applications.
67     *
68     * @param digestPrefix The hash prefix of the instant app's domain.
69     */
70    public void onGetInstantAppIntentFilter(
71            int digestPrefix[], String token, InstantAppResolutionCallback callback) {
72        throw new IllegalStateException("Must define");
73    }
74
75    /**
76     * Returns a {@link Looper} to perform service operations on.
77     */
78    Looper getLooper() {
79        return getBaseContext().getMainLooper();
80    }
81
82    @Override
83    public final void attachBaseContext(Context base) {
84        super.attachBaseContext(base);
85        mHandler = new ServiceHandler(getLooper());
86    }
87
88    @Override
89    public final IBinder onBind(Intent intent) {
90        return new IInstantAppResolver.Stub() {
91            @Override
92            public void getInstantAppResolveInfoList(
93                    int digestPrefix[], String token, int sequence, IRemoteCallback callback) {
94                if (DEBUG_EPHEMERAL) {
95                    Slog.v(TAG, "[" + token + "] Phase1 called; posting");
96                }
97                final SomeArgs args = SomeArgs.obtain();
98                args.arg1 = callback;
99                args.arg2 = digestPrefix;
100                args.arg3 = token;
101                mHandler.obtainMessage(
102                                ServiceHandler.MSG_GET_INSTANT_APP_RESOLVE_INFO, sequence, 0, args)
103                        .sendToTarget();
104            }
105
106            @Override
107            public void getInstantAppIntentFilterList(
108                    int digestPrefix[], String token, String hostName, IRemoteCallback callback) {
109                if (DEBUG_EPHEMERAL) {
110                    Slog.v(TAG, "[" + token + "] Phase2 called; posting");
111                }
112                final SomeArgs args = SomeArgs.obtain();
113                args.arg1 = callback;
114                args.arg2 = digestPrefix;
115                args.arg3 = token;
116                args.arg4 = hostName;
117                mHandler.obtainMessage(
118                        ServiceHandler.MSG_GET_INSTANT_APP_INTENT_FILTER, callback).sendToTarget();
119            }
120        };
121    }
122
123    /**
124     * Callback to post results from instant app resolution.
125     */
126    public static final class InstantAppResolutionCallback {
127        private final IRemoteCallback mCallback;
128        private final int mSequence;
129        InstantAppResolutionCallback(int sequence, IRemoteCallback callback) {
130            mCallback = callback;
131            mSequence = sequence;
132        }
133
134        public void onInstantAppResolveInfo(List<InstantAppResolveInfo> resolveInfo) {
135            final Bundle data = new Bundle();
136            data.putParcelableList(EXTRA_RESOLVE_INFO, resolveInfo);
137            data.putInt(EXTRA_SEQUENCE, mSequence);
138            try {
139                mCallback.sendResult(data);
140            } catch (RemoteException e) {
141            }
142        }
143    }
144
145    @Deprecated
146    void _onGetInstantAppResolveInfo(int[] digestPrefix, String token,
147            InstantAppResolutionCallback callback) {
148        if (DEBUG_EPHEMERAL) {
149            Slog.d(TAG, "[" + token + "] Phase1 request;"
150                    + " prefix: " + Arrays.toString(digestPrefix));
151        }
152        onGetInstantAppResolveInfo(digestPrefix, token, callback);
153    }
154    @Deprecated
155    void _onGetInstantAppIntentFilter(int digestPrefix[], String token, String hostName,
156            InstantAppResolutionCallback callback) {
157        if (DEBUG_EPHEMERAL) {
158            Slog.d(TAG, "[" + token + "] Phase2 request;"
159                    + " prefix: " + Arrays.toString(digestPrefix));
160        }
161        onGetInstantAppIntentFilter(digestPrefix, token, callback);
162    }
163
164    private final class ServiceHandler extends Handler {
165        public static final int MSG_GET_INSTANT_APP_RESOLVE_INFO = 1;
166        public static final int MSG_GET_INSTANT_APP_INTENT_FILTER = 2;
167
168        public ServiceHandler(Looper looper) {
169            super(looper, null /*callback*/, true /*async*/);
170        }
171
172        @Override
173        @SuppressWarnings("unchecked")
174        public void handleMessage(Message message) {
175            final int action = message.what;
176            switch (action) {
177                case MSG_GET_INSTANT_APP_RESOLVE_INFO: {
178                    final SomeArgs args = (SomeArgs) message.obj;
179                    final IRemoteCallback callback = (IRemoteCallback) args.arg1;
180                    final int[] digestPrefix = (int[]) args.arg2;
181                    final String token = (String) args.arg3;
182                    final int sequence = message.arg1;
183                    _onGetInstantAppResolveInfo(
184                            digestPrefix, token,
185                            new InstantAppResolutionCallback(sequence, callback));
186                } break;
187
188                case MSG_GET_INSTANT_APP_INTENT_FILTER: {
189                    final SomeArgs args = (SomeArgs) message.obj;
190                    final IRemoteCallback callback = (IRemoteCallback) args.arg1;
191                    final int[] digestPrefix = (int[]) args.arg2;
192                    final String token = (String) args.arg3;
193                    final String hostName = (String) args.arg4;
194                    _onGetInstantAppIntentFilter(
195                            digestPrefix, token, hostName,
196                            new InstantAppResolutionCallback(-1 /*sequence*/, callback));
197                } break;
198
199                default: {
200                    throw new IllegalArgumentException("Unknown message: " + action);
201                }
202            }
203        }
204    }
205}
206