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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 package org.chromium.device.nfc; | |
| 6 | |
| 7 import android.Manifest; | |
| 8 import android.annotation.TargetApi; | |
| 9 import android.app.Activity; | |
| 10 import android.content.Context; | |
| 11 import android.content.pm.PackageManager; | |
| 12 import android.nfc.FormatException; | |
| 13 import android.nfc.NdefMessage; | |
| 14 import android.nfc.NfcAdapter; | |
| 15 import android.nfc.NfcAdapter.ReaderCallback; | |
| 16 import android.nfc.NfcManager; | |
| 17 import android.nfc.Tag; | |
| 18 import android.nfc.TagLostException; | |
| 19 import android.os.Build; | |
| 20 import android.os.Handler; | |
| 21 import android.os.Process; | |
| 22 import android.util.SparseArray; | |
| 23 | |
| 24 import org.chromium.base.Callback; | |
| 25 import org.chromium.base.Log; | |
| 26 import org.chromium.device.nfc.mojom.Nfc; | |
| 27 import org.chromium.device.nfc.mojom.NfcClient; | |
| 28 import org.chromium.device.nfc.mojom.NfcError; | |
| 29 import org.chromium.device.nfc.mojom.NfcErrorType; | |
| 30 import org.chromium.device.nfc.mojom.NfcMessage; | |
| 31 import org.chromium.device.nfc.mojom.NfcPushOptions; | |
| 32 import org.chromium.device.nfc.mojom.NfcPushTarget; | |
| 33 import org.chromium.device.nfc.mojom.NfcWatchMode; | |
| 34 import org.chromium.device.nfc.mojom.NfcWatchOptions; | |
| 35 import org.chromium.mojo.bindings.Callbacks; | |
| 36 import org.chromium.mojo.system.MojoException; | |
| 37 | |
| 38 import java.io.IOException; | |
| 39 import java.io.UnsupportedEncodingException; | |
| 40 import java.util.ArrayList; | |
| 41 import java.util.List; | |
| 42 | |
| 43 /** Android implementation of the NFC mojo service defined in device/nfc/nfc.moj
om. | |
| 44 */ | |
| 45 public class NfcImpl implements Nfc { | |
| 46 private static final String TAG = "NfcImpl"; | |
| 47 | |
| 48 private final int mHostId; | |
| 49 | |
| 50 private final NfcDelegate mDelegate; | |
| 51 | |
| 52 /** | |
| 53 * Used to get instance of NFC adapter, @see android.nfc.NfcManager | |
| 54 */ | |
| 55 private final NfcManager mNfcManager; | |
| 56 | |
| 57 /** | |
| 58 * NFC adapter. @see android.nfc.NfcAdapter | |
| 59 */ | |
| 60 private final NfcAdapter mNfcAdapter; | |
| 61 | |
| 62 /** | |
| 63 * Activity that is in foreground and is used to enable / disable NFC reader
mode operations. | |
| 64 * Can be updated when activity associated with web page is changed. @see #s
etActivity | |
| 65 */ | |
| 66 private Activity mActivity; | |
| 67 | |
| 68 /** | |
| 69 * Flag that indicates whether NFC permission is granted. | |
| 70 */ | |
| 71 private final boolean mHasPermission; | |
| 72 | |
| 73 /** | |
| 74 * Implementation of android.nfc.NfcAdapter.ReaderCallback. @see ReaderCallb
ackHandler | |
| 75 */ | |
| 76 private ReaderCallbackHandler mReaderCallbackHandler; | |
| 77 | |
| 78 /** | |
| 79 * Object that contains data that was passed to method | |
| 80 * #push(NfcMessage message, NfcPushOptions options, PushResponse callback) | |
| 81 * @see PendingPushOperation | |
| 82 */ | |
| 83 private PendingPushOperation mPendingPushOperation; | |
| 84 | |
| 85 /** | |
| 86 * Utility that provides I/O operations for a Tag. Created on demand when Ta
g is found. | |
| 87 * @see NfcTagHandler | |
| 88 */ | |
| 89 private NfcTagHandler mTagHandler; | |
| 90 | |
| 91 /** | |
| 92 * Client interface used to deliver NFCMessages for registered watch operati
ons. | |
| 93 * @see #watch | |
| 94 */ | |
| 95 private NfcClient mClient; | |
| 96 | |
| 97 /** | |
| 98 * Watcher id that is incremented for each #watch call. | |
| 99 */ | |
| 100 private int mWatcherId; | |
| 101 | |
| 102 /** | |
| 103 * Map of watchId <-> NfcWatchOptions. All NfcWatchOptions are matched again
st tag that is in | |
| 104 * proximity, when match algorithm (@see #matchesWatchOptions) returns true,
watcher with | |
| 105 * corresponding ID would be notified using NfcClient interface. | |
| 106 * @see NfcClient#onWatch(int[] id, NfcMessage message) | |
| 107 */ | |
| 108 private final SparseArray<NfcWatchOptions> mWatchers = new SparseArray<>(); | |
| 109 | |
| 110 /** | |
| 111 * Handler that runs delayed push timeout task. | |
| 112 */ | |
| 113 private final Handler mPushTimeoutHandler = new Handler(); | |
| 114 | |
| 115 /** | |
| 116 * Runnable responsible for cancelling push operation after specified timeou
t. | |
| 117 */ | |
| 118 private Runnable mPushTimeoutRunnable; | |
| 119 | |
| 120 public NfcImpl(Context context, int hostId, NfcDelegate delegate) { | |
| 121 mHostId = hostId; | |
| 122 mDelegate = delegate; | |
| 123 int permission = | |
| 124 context.checkPermission(Manifest.permission.NFC, Process.myPid()
, Process.myUid()); | |
| 125 mHasPermission = permission == PackageManager.PERMISSION_GRANTED; | |
| 126 Callback<Activity> onActivityUpdatedCallback = new Callback<Activity>()
{ | |
| 127 @Override | |
| 128 public void onResult(Activity activity) { | |
| 129 setActivity(activity); | |
| 130 } | |
| 131 }; | |
| 132 | |
| 133 mDelegate.trackActivityForHost(mHostId, onActivityUpdatedCallback); | |
| 134 | |
| 135 if (!mHasPermission || Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKA
T) { | |
| 136 Log.w(TAG, "NFC operations are not permitted."); | |
| 137 mNfcAdapter = null; | |
| 138 mNfcManager = null; | |
| 139 } else { | |
| 140 mNfcManager = (NfcManager) context.getSystemService(Context.NFC_SERV
ICE); | |
| 141 if (mNfcManager == null) { | |
| 142 Log.w(TAG, "NFC is not supported."); | |
| 143 mNfcAdapter = null; | |
| 144 } else { | |
| 145 mNfcAdapter = mNfcManager.getDefaultAdapter(); | |
| 146 } | |
| 147 } | |
| 148 } | |
| 149 | |
| 150 /** | |
| 151 * Sets Activity that is used to enable / disable NFC reader mode. When Acti
vity is set, | |
| 152 * reader mode is disabled for old Activity and enabled for the new Activity
. | |
| 153 */ | |
| 154 protected void setActivity(Activity activity) { | |
| 155 disableReaderMode(); | |
| 156 mActivity = activity; | |
| 157 enableReaderModeIfNeeded(); | |
| 158 } | |
| 159 | |
| 160 /** | |
| 161 * Sets NfcClient. NfcClient interface is used to notify mojo NFC service cl
ient when NFC | |
| 162 * device is in proximity and has NfcMessage that matches NfcWatchOptions cr
iteria. | |
| 163 * @see Nfc#watch(NfcWatchOptions options, WatchResponse callback) | |
| 164 * | |
| 165 * @param client @see NfcClient | |
| 166 */ | |
| 167 @Override | |
| 168 public void setClient(NfcClient client) { | |
| 169 mClient = client; | |
| 170 } | |
| 171 | |
| 172 /** | |
| 173 * Pushes NfcMessage to Tag or Peer, whenever NFC device is in proximity. At
the moment, only | |
| 174 * passive NFC devices are supported (NfcPushTarget.TAG). | |
| 175 * | |
| 176 * @param message that should be pushed to NFC device. | |
| 177 * @param options that contain information about timeout and target device t
ype. | |
| 178 * @param callback that is used to notify when push operation is completed. | |
| 179 */ | |
| 180 @Override | |
| 181 public void push(NfcMessage message, NfcPushOptions options, PushResponse ca
llback) { | |
| 182 if (!checkIfReady(callback)) return; | |
| 183 | |
| 184 if (!NfcMessageValidator.isValid(message)) { | |
| 185 callback.call(createError(NfcErrorType.INVALID_MESSAGE)); | |
| 186 return; | |
| 187 } | |
| 188 | |
| 189 // Check NfcPushOptions that are not supported by Android platform. | |
| 190 if (options.target == NfcPushTarget.PEER || options.timeout < 0 | |
| 191 || (options.timeout > Long.MAX_VALUE && !Double.isInfinite(optio
ns.timeout))) { | |
| 192 callback.call(createError(NfcErrorType.NOT_SUPPORTED)); | |
| 193 return; | |
| 194 } | |
| 195 | |
| 196 // If previous pending push operation is not completed, cancel it. | |
| 197 if (mPendingPushOperation != null) { | |
| 198 mPendingPushOperation.complete(createError(NfcErrorType.OPERATION_CA
NCELLED)); | |
| 199 cancelPushTimeoutTask(); | |
| 200 } | |
| 201 | |
| 202 mPendingPushOperation = new PendingPushOperation(message, options, callb
ack); | |
| 203 | |
| 204 // Schedule push timeout task for new #mPendingPushOperation. | |
| 205 schedulePushTimeoutTask(options); | |
| 206 enableReaderModeIfNeeded(); | |
| 207 processPendingPushOperation(); | |
| 208 } | |
| 209 | |
| 210 /** | |
| 211 * Cancels pending push operation. | |
| 212 * At the moment, only passive NFC devices are supported (NfcPushTarget.TAG)
. | |
| 213 * | |
| 214 * @param target @see NfcPushTarget | |
| 215 * @param callback that is used to notify caller when cancelPush() is comple
ted. | |
| 216 */ | |
| 217 @Override | |
| 218 public void cancelPush(int target, CancelPushResponse callback) { | |
| 219 if (!checkIfReady(callback)) return; | |
| 220 | |
| 221 if (target == NfcPushTarget.PEER) { | |
| 222 callback.call(createError(NfcErrorType.NOT_SUPPORTED)); | |
| 223 return; | |
| 224 } | |
| 225 | |
| 226 if (mPendingPushOperation == null) { | |
| 227 callback.call(createError(NfcErrorType.NOT_FOUND)); | |
| 228 } else { | |
| 229 completePendingPushOperation(createError(NfcErrorType.OPERATION_CANC
ELLED)); | |
| 230 callback.call(null); | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 /** | |
| 235 * Watch method allows to set filtering criteria for NfcMessages that are fo
und when NFC device | |
| 236 * is within proximity. On success, watch ID is returned to caller through W
atchResponse | |
| 237 * callback. When NfcMessage that matches NfcWatchOptions is found, it is pa
ssed to NfcClient | |
| 238 * interface together with corresponding watch ID. | |
| 239 * @see NfcClient#onWatch(int[] id, NfcMessage message) | |
| 240 * | |
| 241 * @param options used to filter NfcMessages, @see NfcWatchOptions. | |
| 242 * @param callback that is used to notify caller when watch() is completed a
nd return watch ID. | |
| 243 */ | |
| 244 @Override | |
| 245 public void watch(NfcWatchOptions options, WatchResponse callback) { | |
| 246 if (!checkIfReady(callback)) return; | |
| 247 int watcherId = ++mWatcherId; | |
| 248 mWatchers.put(watcherId, options); | |
| 249 callback.call(watcherId, null); | |
| 250 enableReaderModeIfNeeded(); | |
| 251 processPendingWatchOperations(); | |
| 252 } | |
| 253 | |
| 254 /** | |
| 255 * Cancels NFC watch operation. | |
| 256 * | |
| 257 * @param id of watch operation. | |
| 258 * @param callback that is used to notify caller when cancelWatch() is compl
eted. | |
| 259 */ | |
| 260 @Override | |
| 261 public void cancelWatch(int id, CancelWatchResponse callback) { | |
| 262 if (!checkIfReady(callback)) return; | |
| 263 | |
| 264 if (mWatchers.indexOfKey(id) < 0) { | |
| 265 callback.call(createError(NfcErrorType.NOT_FOUND)); | |
| 266 } else { | |
| 267 mWatchers.remove(id); | |
| 268 callback.call(null); | |
| 269 disableReaderModeIfNeeded(); | |
| 270 } | |
| 271 } | |
| 272 | |
| 273 /** | |
| 274 * Cancels all NFC watch operations. | |
| 275 * | |
| 276 * @param callback that is used to notify caller when cancelAllWatches() is
completed. | |
| 277 */ | |
| 278 @Override | |
| 279 public void cancelAllWatches(CancelAllWatchesResponse callback) { | |
| 280 if (!checkIfReady(callback)) return; | |
| 281 | |
| 282 if (mWatchers.size() == 0) { | |
| 283 callback.call(createError(NfcErrorType.NOT_FOUND)); | |
| 284 } else { | |
| 285 mWatchers.clear(); | |
| 286 callback.call(null); | |
| 287 disableReaderModeIfNeeded(); | |
| 288 } | |
| 289 } | |
| 290 | |
| 291 /** | |
| 292 * Suspends all pending operations. Should be called when web page visibilit
y is lost. | |
| 293 */ | |
| 294 @Override | |
| 295 public void suspendNfcOperations() { | |
| 296 disableReaderMode(); | |
| 297 } | |
| 298 | |
| 299 /** | |
| 300 * Resumes all pending watch / push operations. Should be called when web pa
ge becomes visible. | |
| 301 */ | |
| 302 @Override | |
| 303 public void resumeNfcOperations() { | |
| 304 enableReaderModeIfNeeded(); | |
| 305 } | |
| 306 | |
| 307 @Override | |
| 308 public void close() { | |
| 309 mDelegate.stopTrackingActivityForHost(mHostId); | |
| 310 disableReaderMode(); | |
| 311 } | |
| 312 | |
| 313 @Override | |
| 314 public void onConnectionError(MojoException e) { | |
| 315 close(); | |
| 316 } | |
| 317 | |
| 318 /** | |
| 319 * Holds information about pending push operation. | |
| 320 */ | |
| 321 private static class PendingPushOperation { | |
| 322 public final NfcMessage nfcMessage; | |
| 323 public final NfcPushOptions nfcPushOptions; | |
| 324 private final PushResponse mPushResponseCallback; | |
| 325 | |
| 326 public PendingPushOperation( | |
| 327 NfcMessage message, NfcPushOptions options, PushResponse callbac
k) { | |
| 328 nfcMessage = message; | |
| 329 nfcPushOptions = options; | |
| 330 mPushResponseCallback = callback; | |
| 331 } | |
| 332 | |
| 333 /** | |
| 334 * Completes pending push operation. | |
| 335 * | |
| 336 * @param error should be null when operation is completed successfully,
otherwise, | |
| 337 * error object with corresponding NfcErrorType should be provided. | |
| 338 */ | |
| 339 public void complete(NfcError error) { | |
| 340 if (mPushResponseCallback != null) mPushResponseCallback.call(error)
; | |
| 341 } | |
| 342 } | |
| 343 | |
| 344 /** | |
| 345 * Helper method that creates NfcError object from NfcErrorType. | |
| 346 */ | |
| 347 private NfcError createError(int errorType) { | |
| 348 NfcError error = new NfcError(); | |
| 349 error.errorType = errorType; | |
| 350 return error; | |
| 351 } | |
| 352 | |
| 353 /** | |
| 354 * Checks if NFC funcionality can be used by the mojo service. If permission
to use NFC is | |
| 355 * granted and hardware is enabled, returns null. | |
| 356 */ | |
| 357 private NfcError checkIfReady() { | |
| 358 if (!mHasPermission || mActivity == null) { | |
| 359 return createError(NfcErrorType.SECURITY); | |
| 360 } else if (mNfcManager == null || mNfcAdapter == null) { | |
| 361 return createError(NfcErrorType.NOT_SUPPORTED); | |
| 362 } else if (!mNfcAdapter.isEnabled()) { | |
| 363 return createError(NfcErrorType.DEVICE_DISABLED); | |
| 364 } | |
| 365 return null; | |
| 366 } | |
| 367 | |
| 368 /** | |
| 369 * Uses checkIfReady() method and if NFC cannot be used, calls mojo callback
with NfcError. | |
| 370 * | |
| 371 * @param WatchResponse Callback that is provided to watch() method. | |
| 372 * @return boolean true if NFC functionality can be used, false otherwise. | |
| 373 */ | |
| 374 private boolean checkIfReady(WatchResponse callback) { | |
| 375 NfcError error = checkIfReady(); | |
| 376 if (error == null) return true; | |
| 377 | |
| 378 callback.call(0, error); | |
| 379 return false; | |
| 380 } | |
| 381 | |
| 382 /** | |
| 383 * Uses checkIfReady() method and if NFC cannot be used, calls mojo callback
with NfcError. | |
| 384 * | |
| 385 * @param callback Generic callback that is provided to push(), cancelPush()
, | |
| 386 * cancelWatch() and cancelAllWatches() methods. | |
| 387 * @return boolean true if NFC functionality can be used, false otherwise. | |
| 388 */ | |
| 389 private boolean checkIfReady(Callbacks.Callback1<NfcError> callback) { | |
| 390 NfcError error = checkIfReady(); | |
| 391 if (error == null) return true; | |
| 392 | |
| 393 callback.call(error); | |
| 394 return false; | |
| 395 } | |
| 396 | |
| 397 /** | |
| 398 * Implementation of android.nfc.NfcAdapter.ReaderCallback. Callback is call
ed when NFC tag is | |
| 399 * discovered, Tag object is delegated to mojo service implementation method | |
| 400 * NfcImpl.onTagDiscovered(). | |
| 401 */ | |
| 402 @TargetApi(Build.VERSION_CODES.KITKAT) | |
| 403 private static class ReaderCallbackHandler implements ReaderCallback { | |
| 404 private final NfcImpl mNfcImpl; | |
| 405 | |
| 406 public ReaderCallbackHandler(NfcImpl impl) { | |
| 407 mNfcImpl = impl; | |
| 408 } | |
| 409 | |
| 410 @Override | |
| 411 public void onTagDiscovered(Tag tag) { | |
| 412 mNfcImpl.onTagDiscovered(tag); | |
| 413 } | |
| 414 } | |
| 415 | |
| 416 /** | |
| 417 * Enables reader mode, allowing NFC device to read / write NFC tags. | |
| 418 * @see android.nfc.NfcAdapter#enableReaderMode | |
| 419 */ | |
| 420 private void enableReaderModeIfNeeded() { | |
| 421 if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return; | |
| 422 | |
| 423 if (mReaderCallbackHandler != null || mActivity == null || mNfcAdapter =
= null) return; | |
| 424 | |
| 425 // Do not enable reader mode, if there are no active push / watch operat
ions. | |
| 426 if (mPendingPushOperation == null && mWatchers.size() == 0) return; | |
| 427 | |
| 428 mReaderCallbackHandler = new ReaderCallbackHandler(this); | |
| 429 mNfcAdapter.enableReaderMode(mActivity, mReaderCallbackHandler, | |
| 430 NfcAdapter.FLAG_READER_NFC_A | NfcAdapter.FLAG_READER_NFC_B | |
| 431 | NfcAdapter.FLAG_READER_NFC_F | NfcAdapter.FLAG_READER_
NFC_V, | |
| 432 null); | |
| 433 } | |
| 434 | |
| 435 /** | |
| 436 * Disables reader mode. | |
| 437 * @see android.nfc.NfcAdapter#disableReaderMode | |
| 438 */ | |
| 439 @TargetApi(Build.VERSION_CODES.KITKAT) | |
| 440 private void disableReaderMode() { | |
| 441 if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return; | |
| 442 | |
| 443 // There is no API that could query whether reader mode is enabled for a
dapter. | |
| 444 // If mReaderCallbackHandler is null, reader mode is not enabled. | |
| 445 if (mReaderCallbackHandler == null) return; | |
| 446 | |
| 447 mReaderCallbackHandler = null; | |
| 448 if (mActivity != null && mNfcAdapter != null && !mActivity.isDestroyed()
) { | |
| 449 mNfcAdapter.disableReaderMode(mActivity); | |
| 450 } | |
| 451 } | |
| 452 | |
| 453 /** | |
| 454 * Checks if there are pending push / watch operations and disables readre m
ode | |
| 455 * whenever necessary. | |
| 456 */ | |
| 457 private void disableReaderModeIfNeeded() { | |
| 458 if (mPendingPushOperation == null && mWatchers.size() == 0) { | |
| 459 disableReaderMode(); | |
| 460 } | |
| 461 } | |
| 462 | |
| 463 /** | |
| 464 * Handles completion of pending push operation, cancels timeout task and co
mpletes push | |
| 465 * operation. On error, invalidates #mTagHandler. | |
| 466 */ | |
| 467 private void pendingPushOperationCompleted(NfcError error) { | |
| 468 completePendingPushOperation(error); | |
| 469 if (error != null) mTagHandler = null; | |
| 470 } | |
| 471 | |
| 472 /** | |
| 473 * Completes pending push operation and disables reader mode if needed. | |
| 474 */ | |
| 475 private void completePendingPushOperation(NfcError error) { | |
| 476 if (mPendingPushOperation == null) return; | |
| 477 | |
| 478 cancelPushTimeoutTask(); | |
| 479 mPendingPushOperation.complete(error); | |
| 480 mPendingPushOperation = null; | |
| 481 disableReaderModeIfNeeded(); | |
| 482 } | |
| 483 | |
| 484 /** | |
| 485 * Checks whether there is a #mPendingPushOperation and writes data to NFC t
ag. In case of | |
| 486 * exception calls pendingPushOperationCompleted() with appropriate error ob
ject. | |
| 487 */ | |
| 488 private void processPendingPushOperation() { | |
| 489 if (mTagHandler == null || mPendingPushOperation == null) return; | |
| 490 | |
| 491 if (mTagHandler.isTagOutOfRange()) { | |
| 492 mTagHandler = null; | |
| 493 return; | |
| 494 } | |
| 495 | |
| 496 try { | |
| 497 mTagHandler.connect(); | |
| 498 mTagHandler.write(NfcTypeConverter.toNdefMessage(mPendingPushOperati
on.nfcMessage)); | |
| 499 pendingPushOperationCompleted(null); | |
| 500 } catch (InvalidNfcMessageException e) { | |
| 501 Log.w(TAG, "Cannot write data to NFC tag. Invalid NfcMessage."); | |
| 502 pendingPushOperationCompleted(createError(NfcErrorType.INVALID_MESSA
GE)); | |
| 503 } catch (TagLostException e) { | |
| 504 Log.w(TAG, "Cannot write data to NFC tag. Tag is lost."); | |
| 505 pendingPushOperationCompleted(createError(NfcErrorType.IO_ERROR)); | |
| 506 } catch (FormatException | IllegalStateException | IOException e) { | |
| 507 Log.w(TAG, "Cannot write data to NFC tag. IO_ERROR."); | |
| 508 pendingPushOperationCompleted(createError(NfcErrorType.IO_ERROR)); | |
| 509 } | |
| 510 } | |
| 511 | |
| 512 /** | |
| 513 * Reads NfcMessage from a tag and forwards message to matching method. | |
| 514 */ | |
| 515 private void processPendingWatchOperations() { | |
| 516 if (mTagHandler == null || mClient == null || mWatchers.size() == 0) ret
urn; | |
| 517 | |
| 518 // Skip reading if there is a pending push operation and ignoreRead flag
is set. | |
| 519 if (mPendingPushOperation != null && mPendingPushOperation.nfcPushOption
s.ignoreRead) { | |
| 520 return; | |
| 521 } | |
| 522 | |
| 523 if (mTagHandler.isTagOutOfRange()) { | |
| 524 mTagHandler = null; | |
| 525 return; | |
| 526 } | |
| 527 | |
| 528 NdefMessage message = null; | |
| 529 | |
| 530 try { | |
| 531 mTagHandler.connect(); | |
| 532 message = mTagHandler.read(); | |
| 533 if (message.getByteArrayLength() > NfcMessage.MAX_SIZE) { | |
| 534 Log.w(TAG, "Cannot read data from NFC tag. NfcMessage exceeds al
lowed size."); | |
| 535 return; | |
| 536 } | |
| 537 } catch (TagLostException e) { | |
| 538 Log.w(TAG, "Cannot read data from NFC tag. Tag is lost."); | |
| 539 } catch (FormatException | IllegalStateException | IOException e) { | |
| 540 Log.w(TAG, "Cannot read data from NFC tag. IO_ERROR."); | |
| 541 } | |
| 542 | |
| 543 if (message != null) notifyMatchingWatchers(message); | |
| 544 } | |
| 545 | |
| 546 /** | |
| 547 * Iterates through active watchers and if any of those match NfcWatchOption
s criteria, | |
| 548 * delivers NfcMessage to the client. | |
| 549 */ | |
| 550 private void notifyMatchingWatchers(NdefMessage message) { | |
| 551 try { | |
| 552 NfcMessage nfcMessage = NfcTypeConverter.toNfcMessage(message); | |
| 553 List<Integer> watchIds = new ArrayList<Integer>(); | |
| 554 for (int i = 0; i < mWatchers.size(); i++) { | |
| 555 NfcWatchOptions options = mWatchers.valueAt(i); | |
| 556 if (matchesWatchOptions(nfcMessage, options)) watchIds.add(mWatc
hers.keyAt(i)); | |
| 557 } | |
| 558 | |
| 559 if (watchIds.size() != 0) { | |
| 560 int[] ids = new int[watchIds.size()]; | |
| 561 for (int i = 0; i < watchIds.size(); ++i) { | |
| 562 ids[i] = watchIds.get(i).intValue(); | |
| 563 } | |
| 564 mClient.onWatch(ids, nfcMessage); | |
| 565 } | |
| 566 } catch (UnsupportedEncodingException e) { | |
| 567 Log.w(TAG, "Cannot convert NdefMessage to NfcMessage."); | |
| 568 } | |
| 569 } | |
| 570 | |
| 571 /** | |
| 572 * Implements matching algorithm. | |
| 573 */ | |
| 574 private boolean matchesWatchOptions(NfcMessage message, NfcWatchOptions opti
ons) { | |
| 575 // Valid WebNFC message must have non-empty url. | |
| 576 if (options.mode == NfcWatchMode.WEBNFC_ONLY | |
| 577 && (message.url == null || message.url.isEmpty())) { | |
| 578 return false; | |
| 579 } | |
| 580 | |
| 581 // Filter by NfcMessage.url | |
| 582 if (options.url != null && !options.url.isEmpty() && !options.url.equals
(message.url)) { | |
| 583 return false; | |
| 584 } | |
| 585 | |
| 586 // Matches any record / media type. | |
| 587 if ((options.mediaType == null || options.mediaType.isEmpty()) | |
| 588 && options.recordFilter == null) { | |
| 589 return true; | |
| 590 } | |
| 591 | |
| 592 // Filter by mediaType and recordType | |
| 593 for (int i = 0; i < message.data.length; i++) { | |
| 594 boolean matchedMediaType; | |
| 595 boolean matchedRecordType; | |
| 596 | |
| 597 if (options.mediaType == null || options.mediaType.isEmpty()) { | |
| 598 // If media type for the watch options is empty, match all media
types. | |
| 599 matchedMediaType = true; | |
| 600 } else { | |
| 601 matchedMediaType = options.mediaType.equals(message.data[i].medi
aType); | |
| 602 } | |
| 603 | |
| 604 if (options.recordFilter == null) { | |
| 605 // If record type filter for the watch options is null, match al
l record types. | |
| 606 matchedRecordType = true; | |
| 607 } else { | |
| 608 matchedRecordType = options.recordFilter.recordType == message.d
ata[i].recordType; | |
| 609 } | |
| 610 | |
| 611 if (matchedMediaType && matchedRecordType) return true; | |
| 612 } | |
| 613 | |
| 614 return false; | |
| 615 } | |
| 616 | |
| 617 /** | |
| 618 * Called by ReaderCallbackHandler when NFC tag is in proximity. | |
| 619 */ | |
| 620 public void onTagDiscovered(Tag tag) { | |
| 621 processPendingOperations(NfcTagHandler.create(tag)); | |
| 622 } | |
| 623 | |
| 624 /** | |
| 625 * Processes pending operation when NFC tag is in proximity. | |
| 626 */ | |
| 627 protected void processPendingOperations(NfcTagHandler tagHandler) { | |
| 628 mTagHandler = tagHandler; | |
| 629 processPendingWatchOperations(); | |
| 630 processPendingPushOperation(); | |
| 631 if (mTagHandler != null && mTagHandler.isConnected()) { | |
| 632 try { | |
| 633 mTagHandler.close(); | |
| 634 } catch (IOException e) { | |
| 635 Log.w(TAG, "Cannot close NFC tag connection."); | |
| 636 } | |
| 637 } | |
| 638 } | |
| 639 | |
| 640 /** | |
| 641 * Schedules task that is executed after timeout and cancels pending push op
eration. | |
| 642 */ | |
| 643 private void schedulePushTimeoutTask(NfcPushOptions options) { | |
| 644 assert mPushTimeoutRunnable == null; | |
| 645 // Default timeout value. | |
| 646 if (Double.isInfinite(options.timeout)) return; | |
| 647 | |
| 648 // Create and schedule timeout. | |
| 649 mPushTimeoutRunnable = new Runnable() { | |
| 650 @Override | |
| 651 public void run() { | |
| 652 completePendingPushOperation(createError(NfcErrorType.TIMER_EXPI
RED)); | |
| 653 } | |
| 654 }; | |
| 655 | |
| 656 mPushTimeoutHandler.postDelayed(mPushTimeoutRunnable, (long) options.tim
eout); | |
| 657 } | |
| 658 | |
| 659 /** | |
| 660 * Cancels push timeout task. | |
| 661 */ | |
| 662 void cancelPushTimeoutTask() { | |
| 663 if (mPushTimeoutRunnable == null) return; | |
| 664 | |
| 665 mPushTimeoutHandler.removeCallbacks(mPushTimeoutRunnable); | |
| 666 mPushTimeoutRunnable = null; | |
| 667 } | |
| 668 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2894373002:
[DeviceService] Move //device/nfc to be part of the internal impl of Device Service (Closed)
