Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 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 | package android.service.autofill; |
| 17 | |
| 18 | import android.annotation.NonNull; |
| 19 | import android.annotation.Nullable; |
| 20 | import android.os.RemoteException; |
| 21 | import com.android.internal.os.HandlerCaller; |
| 22 | import android.annotation.SdkConstant; |
| 23 | import android.app.Activity; |
| 24 | import android.app.Service; |
| 25 | import android.app.assist.AssistStructure; |
| 26 | import android.content.Intent; |
| 27 | import android.os.Bundle; |
| 28 | import android.os.CancellationSignal; |
| 29 | import android.os.IBinder; |
| 30 | import android.os.ICancellationSignal; |
| 31 | import android.os.Looper; |
| 32 | import android.util.Log; |
Felipe Leme | 2ac463e | 2017-03-13 14:06:25 -0700 | [diff] [blame] | 33 | import android.view.autofill.AutofillManager; |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 34 | |
| 35 | import com.android.internal.os.SomeArgs; |
| 36 | |
| 37 | //TODO(b/33197203): improve javadoc (of both class and methods); in particular, make sure the |
| 38 | //life-cycle (and how state could be maintained on server-side) is well documented. |
| 39 | |
| 40 | /** |
| 41 | * Top-level service of the current autofill service for a given user. |
| 42 | * |
| 43 | * <p>Apps providing autofill capabilities must extend this service. |
| 44 | */ |
| 45 | public abstract class AutofillService extends Service { |
| 46 | private static final String TAG = "AutofillService"; |
| 47 | |
| 48 | /** |
| 49 | * The {@link Intent} that must be declared as handled by the service. |
| 50 | * To be supported, the service must also require the |
| 51 | * {@link android.Manifest.permission#BIND_AUTO_FILL} permission so |
| 52 | * that other applications can not abuse it. |
| 53 | * |
| 54 | * @hide |
| 55 | * @deprecated TODO(b/35956626): remove once clients use AutofillService |
| 56 | */ |
| 57 | @Deprecated |
| 58 | @SdkConstant(SdkConstant.SdkConstantType.SERVICE_ACTION) |
| 59 | public static final String OLD_SERVICE_INTERFACE = "android.service.autofill.AutoFillService"; |
| 60 | |
| 61 | /** |
| 62 | * The {@link Intent} that must be declared as handled by the service. |
| 63 | * To be supported, the service must also require the |
| 64 | * {@link android.Manifest.permission#BIND_AUTOFILL} permission so |
| 65 | * that other applications can not abuse it. |
| 66 | */ |
| 67 | @SdkConstant(SdkConstant.SdkConstantType.SERVICE_ACTION) |
| 68 | public static final String SERVICE_INTERFACE = "android.service.autofill.AutofillService"; |
| 69 | |
| 70 | /** |
| 71 | * Name under which a AutoFillService component publishes information about itself. |
| 72 | * This meta-data should reference an XML resource containing a |
| 73 | * <code><{@link |
Felipe Leme | f78e952 | 2017-04-04 15:07:13 -0700 | [diff] [blame] | 74 | * android.R.styleable#AutofillService autofill-service}></code> tag. |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 75 | * This is a a sample XML file configuring an AutoFillService: |
| 76 | * <pre> <autofill-service |
| 77 | * android:settingsActivity="foo.bar.SettingsActivity" |
| 78 | * . . . |
| 79 | * /></pre> |
| 80 | */ |
| 81 | public static final String SERVICE_META_DATA = "android.autofill"; |
| 82 | |
| 83 | // Internal extras |
| 84 | /** @hide */ |
Philip P. Moltmann | eab62ba | 2017-03-20 10:55:43 -0700 | [diff] [blame^] | 85 | public static final String EXTRA_SESSION_ID = "android.service.autofill.extra.SESSION_ID"; |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 86 | |
| 87 | // Handler messages. |
| 88 | private static final int MSG_CONNECT = 1; |
| 89 | private static final int MSG_DISCONNECT = 2; |
| 90 | private static final int MSG_ON_FILL_REQUEST = 3; |
| 91 | private static final int MSG_ON_SAVE_REQUEST = 4; |
| 92 | |
Felipe Leme | 2ac463e | 2017-03-13 14:06:25 -0700 | [diff] [blame] | 93 | private static final int UNUSED_ARG = -1; |
| 94 | |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 95 | private final IAutoFillService mInterface = new IAutoFillService.Stub() { |
| 96 | @Override |
| 97 | public void onInit(IAutoFillServiceConnection connection) { |
| 98 | if (connection != null) { |
| 99 | mHandlerCaller.obtainMessageO(MSG_CONNECT, connection).sendToTarget(); |
| 100 | } else { |
| 101 | mHandlerCaller.obtainMessage(MSG_DISCONNECT).sendToTarget(); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | @Override |
| 106 | public void onFillRequest(AssistStructure structure, Bundle extras, |
Felipe Leme | 2ac463e | 2017-03-13 14:06:25 -0700 | [diff] [blame] | 107 | IFillCallback callback, int flags) { |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 108 | ICancellationSignal transport = CancellationSignal.createTransport(); |
| 109 | try { |
| 110 | callback.onCancellable(transport); |
| 111 | } catch (RemoteException e) { |
| 112 | e.rethrowFromSystemServer(); |
| 113 | } |
Felipe Leme | 2ac463e | 2017-03-13 14:06:25 -0700 | [diff] [blame] | 114 | mHandlerCaller.obtainMessageIIOOOO(MSG_ON_FILL_REQUEST, flags, UNUSED_ARG, structure, |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 115 | CancellationSignal.fromTransport(transport), extras, callback) |
| 116 | .sendToTarget(); |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | public void onSaveRequest(AssistStructure structure, Bundle extras, |
| 121 | ISaveCallback callback) { |
| 122 | mHandlerCaller.obtainMessageOOO(MSG_ON_SAVE_REQUEST, structure, |
| 123 | extras, callback).sendToTarget(); |
| 124 | } |
| 125 | }; |
| 126 | |
| 127 | private final HandlerCaller.Callback mHandlerCallback = (msg) -> { |
| 128 | switch (msg.what) { |
| 129 | case MSG_CONNECT: { |
| 130 | mConnection = (IAutoFillServiceConnection) msg.obj; |
| 131 | onConnected(); |
| 132 | break; |
| 133 | } case MSG_ON_FILL_REQUEST: { |
| 134 | final SomeArgs args = (SomeArgs) msg.obj; |
| 135 | final AssistStructure structure = (AssistStructure) args.arg1; |
| 136 | final CancellationSignal cancellation = (CancellationSignal) args.arg2; |
| 137 | final Bundle extras = (Bundle) args.arg3; |
| 138 | final IFillCallback callback = (IFillCallback) args.arg4; |
| 139 | final FillCallback fillCallback = new FillCallback(callback); |
Felipe Leme | 2ac463e | 2017-03-13 14:06:25 -0700 | [diff] [blame] | 140 | final int flags = msg.arg1; |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 141 | args.recycle(); |
Felipe Leme | 2ac463e | 2017-03-13 14:06:25 -0700 | [diff] [blame] | 142 | onFillRequest(structure, extras, flags, cancellation, fillCallback); |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 143 | break; |
| 144 | } case MSG_ON_SAVE_REQUEST: { |
| 145 | final SomeArgs args = (SomeArgs) msg.obj; |
| 146 | final AssistStructure structure = (AssistStructure) args.arg1; |
| 147 | final Bundle extras = (Bundle) args.arg2; |
| 148 | final ISaveCallback callback = (ISaveCallback) args.arg3; |
| 149 | final SaveCallback saveCallback = new SaveCallback(callback); |
| 150 | args.recycle(); |
| 151 | onSaveRequest(structure, extras, saveCallback); |
| 152 | break; |
| 153 | } case MSG_DISCONNECT: { |
| 154 | onDisconnected(); |
| 155 | mConnection = null; |
| 156 | break; |
| 157 | } default: { |
| 158 | Log.w(TAG, "MyCallbacks received invalid message type: " + msg); |
| 159 | } |
| 160 | } |
| 161 | }; |
| 162 | |
| 163 | private HandlerCaller mHandlerCaller; |
| 164 | |
| 165 | private IAutoFillServiceConnection mConnection; |
| 166 | |
| 167 | /** |
| 168 | * {@inheritDoc} |
| 169 | * |
| 170 | * <strong>NOTE: </strong>if overridden, it must call {@code super.onCreate()}. |
| 171 | */ |
| 172 | @Override |
| 173 | public void onCreate() { |
| 174 | super.onCreate(); |
| 175 | mHandlerCaller = new HandlerCaller(null, Looper.getMainLooper(), mHandlerCallback, true); |
| 176 | } |
| 177 | |
| 178 | @Override |
| 179 | public final IBinder onBind(Intent intent) { |
| 180 | if (SERVICE_INTERFACE.equals(intent.getAction()) |
| 181 | || OLD_SERVICE_INTERFACE.equals(intent.getAction())) { |
| 182 | return mInterface.asBinder(); |
| 183 | } |
| 184 | Log.w(TAG, "Tried to bind to wrong intent: " + intent); |
| 185 | return null; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Called when the Android system connects to service. |
| 190 | * |
| 191 | * <p>You should generally do initialization here rather than in {@link #onCreate}. |
| 192 | */ |
| 193 | public void onConnected() { |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Called by the Android system do decide if an {@link Activity} can be autofilled by the |
| 198 | * service. |
| 199 | * |
| 200 | * <p>Service must call one of the {@link FillCallback} methods (like |
| 201 | * {@link FillCallback#onSuccess(FillResponse)} |
| 202 | * or {@link FillCallback#onFailure(CharSequence)}) |
| 203 | * to notify the result of the request. |
| 204 | * |
| 205 | * @param structure {@link Activity}'s view structure. |
Felipe Leme | 52d5d3d | 2017-04-04 13:10:58 -0700 | [diff] [blame] | 206 | * @param data bundle containing data passed by the service in a last call to |
| 207 | * {@link FillResponse.Builder#setExtras(Bundle)}, if any. This bundle allows your |
| 208 | * service to keep state between fill and save requests as well as when filling different |
| 209 | * sections of the UI as the system will try to aggressively unbind from the service to |
| 210 | * conserve resources. |
| 211 | * See {@link FillResponse} for examples of multiple-sections requests. |
Felipe Leme | 2ac463e | 2017-03-13 14:06:25 -0700 | [diff] [blame] | 212 | * @param flags either {@code 0} or {@link AutofillManager#FLAG_MANUAL_REQUEST}. |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 213 | * @param cancellationSignal signal for observing cancellation requests. The system will use |
| 214 | * this to notify you that the fill result is no longer needed and you should stop |
| 215 | * handling this fill request in order to save resources. |
| 216 | * @param callback object used to notify the result of the request. |
| 217 | */ |
Felipe Leme | a86aee6 | 2017-04-04 18:27:49 -0700 | [diff] [blame] | 218 | public abstract void onFillRequest(@NonNull AssistStructure structure, @Nullable Bundle data, |
| 219 | int flags, @NonNull CancellationSignal cancellationSignal, |
| 220 | @NonNull FillCallback callback); |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 221 | |
| 222 | /** |
| 223 | * Called when user requests service to save the fields of an {@link Activity}. |
| 224 | * |
| 225 | * <p>Service must call one of the {@link SaveCallback} methods (like |
| 226 | * {@link SaveCallback#onSuccess()} or {@link SaveCallback#onFailure(CharSequence)}) |
| 227 | * to notify the result of the request. |
| 228 | * |
| 229 | * @param structure {@link Activity}'s view structure. |
Felipe Leme | 52d5d3d | 2017-04-04 13:10:58 -0700 | [diff] [blame] | 230 | * @param data bundle containing data passed by the service in a last call to |
| 231 | * {@link FillResponse.Builder#setExtras(Bundle)}, if any. This bundle allows your |
| 232 | * service to keep state between fill and save requests as well as when filling different |
| 233 | * sections of the UI as the system will try to aggressively unbind from the service to |
| 234 | * conserve resources. |
| 235 | * See {@link FillResponse} for examples of multiple-sections requests. |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 236 | * @param callback object used to notify the result of the request. |
| 237 | */ |
| 238 | public abstract void onSaveRequest(@NonNull AssistStructure structure, @Nullable Bundle data, |
| 239 | @NonNull SaveCallback callback); |
| 240 | |
| 241 | /** |
| 242 | * Called when the Android system disconnects from the service. |
| 243 | * |
| 244 | * <p> At this point this service may no longer be an active {@link AutofillService}. |
| 245 | */ |
| 246 | public void onDisconnected() { |
Felipe Leme | 640f30a | 2017-03-06 15:44:06 -0800 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | /** |
| 250 | * Disables the service. After calling this method, the service will |
| 251 | * be disabled and settings will show that it is turned off. |
| 252 | * |
| 253 | * <p>You should call this method only after a call to {@link #onConnected()} |
| 254 | * and before the corresponding call to {@link #onDisconnected()}. In other words |
| 255 | * you can disable your service only while the system is connected to it.</p> |
| 256 | */ |
| 257 | public final void disableSelf() { |
| 258 | if (mConnection != null) { |
| 259 | try { |
| 260 | mConnection.disableSelf(); |
| 261 | } catch (RemoteException re) { |
| 262 | throw re.rethrowFromSystemServer(); |
| 263 | } |
| 264 | } |
| 265 | } |
| 266 | } |