| /* |
| * Copyright (C) 2019 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.car.connecteddevice; |
| |
| import static com.android.car.connecteddevice.util.SafeLog.logd; |
| import static com.android.car.connecteddevice.util.SafeLog.loge; |
| import static com.android.car.connecteddevice.util.SafeLog.logw; |
| |
| import static java.lang.annotation.RetentionPolicy.SOURCE; |
| |
| import androidx.annotation.IntDef; |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| import androidx.annotation.VisibleForTesting; |
| |
| import com.android.car.connecteddevice.connection.CarBluetoothManager; |
| import com.android.car.connecteddevice.connection.DeviceMessage; |
| import com.android.car.connecteddevice.model.AssociatedDevice; |
| import com.android.car.connecteddevice.model.ConnectedDevice; |
| import com.android.car.connecteddevice.model.OobEligibleDevice; |
| import com.android.car.connecteddevice.oob.BluetoothRfcommChannel; |
| import com.android.car.connecteddevice.oob.OobChannel; |
| import com.android.car.connecteddevice.storage.ConnectedDeviceStorage; |
| import com.android.car.connecteddevice.storage.ConnectedDeviceStorage.AssociatedDeviceCallback; |
| import com.android.car.connecteddevice.util.ByteUtils; |
| import com.android.car.connecteddevice.util.EventLog; |
| import com.android.car.connecteddevice.util.ThreadSafeCallbacks; |
| |
| import java.lang.annotation.Retention; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.UUID; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.CopyOnWriteArraySet; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.function.Consumer; |
| |
| /** Manager of devices connected to the car. */ |
| public class ConnectedDeviceManager { |
| |
| private static final String TAG = "ConnectedDeviceManager"; |
| |
| // Device name length is limited by available bytes in BLE advertisement data packet. |
| // |
| // BLE advertisement limits data packet length to 31 |
| // Currently we send: |
| // - 18 bytes for 16 chars UUID: 16 bytes + 2 bytes for header; |
| // - 3 bytes for advertisement being connectable; |
| // which leaves 10 bytes. |
| // Subtracting 2 bytes used by header, we have 8 bytes for device name. |
| private static final int DEVICE_NAME_LENGTH_LIMIT = 8; |
| |
| private final ConnectedDeviceStorage mStorage; |
| |
| private final CarBluetoothManager mCarBluetoothManager; |
| |
| private final ThreadSafeCallbacks<DeviceAssociationCallback> mDeviceAssociationCallbacks = |
| new ThreadSafeCallbacks<>(); |
| |
| private final ThreadSafeCallbacks<ConnectionCallback> mActiveUserConnectionCallbacks = |
| new ThreadSafeCallbacks<>(); |
| |
| private final ThreadSafeCallbacks<ConnectionCallback> mAllUserConnectionCallbacks = |
| new ThreadSafeCallbacks<>(); |
| |
| // deviceId -> (recipientId -> callbacks) |
| private final Map<String, Map<UUID, ThreadSafeCallbacks<DeviceCallback>>> mDeviceCallbacks = |
| new ConcurrentHashMap<>(); |
| |
| // deviceId -> device |
| private final Map<String, ConnectedDevice> mConnectedDevices = |
| new ConcurrentHashMap<>(); |
| |
| // recipientId -> (deviceId -> message bytes) |
| private final Map<UUID, Map<String, List<byte[]>>> mRecipientMissedMessages = |
| new ConcurrentHashMap<>(); |
| |
| // Recipient ids that received multiple callback registrations indicate that the recipient id |
| // has been compromised. Another party now has access the messages intended for that recipient. |
| // As a safeguard, that recipient id will be added to this list and blocked from further |
| // callback notifications. |
| private final Set<UUID> mBlacklistedRecipients = new CopyOnWriteArraySet<>(); |
| |
| private final AtomicBoolean mIsConnectingToUserDevice = new AtomicBoolean(false); |
| |
| private final AtomicBoolean mHasStarted = new AtomicBoolean(false); |
| |
| private String mNameForAssociation; |
| |
| private AssociationCallback mAssociationCallback; |
| |
| private MessageDeliveryDelegate mMessageDeliveryDelegate; |
| |
| private OobChannel mOobChannel; |
| |
| @Retention(SOURCE) |
| @IntDef({ |
| DEVICE_ERROR_INVALID_HANDSHAKE, |
| DEVICE_ERROR_INVALID_MSG, |
| DEVICE_ERROR_INVALID_DEVICE_ID, |
| DEVICE_ERROR_INVALID_VERIFICATION, |
| DEVICE_ERROR_INVALID_CHANNEL_STATE, |
| DEVICE_ERROR_INVALID_ENCRYPTION_KEY, |
| DEVICE_ERROR_STORAGE_FAILURE, |
| DEVICE_ERROR_INVALID_SECURITY_KEY, |
| DEVICE_ERROR_INSECURE_RECIPIENT_ID_DETECTED, |
| DEVICE_ERROR_UNEXPECTED_DISCONNECTION |
| }) |
| public @interface DeviceError {} |
| |
| public static final int DEVICE_ERROR_INVALID_HANDSHAKE = 0; |
| public static final int DEVICE_ERROR_INVALID_MSG = 1; |
| public static final int DEVICE_ERROR_INVALID_DEVICE_ID = 2; |
| public static final int DEVICE_ERROR_INVALID_VERIFICATION = 3; |
| public static final int DEVICE_ERROR_INVALID_CHANNEL_STATE = 4; |
| public static final int DEVICE_ERROR_INVALID_ENCRYPTION_KEY = 5; |
| public static final int DEVICE_ERROR_STORAGE_FAILURE = 6; |
| public static final int DEVICE_ERROR_INVALID_SECURITY_KEY = 7; |
| public static final int DEVICE_ERROR_INSECURE_RECIPIENT_ID_DETECTED = 8; |
| public static final int DEVICE_ERROR_UNEXPECTED_DISCONNECTION = 9; |
| |
| public ConnectedDeviceManager(@NonNull CarBluetoothManager carBluetoothManager, |
| @NonNull ConnectedDeviceStorage storage) { |
| Executor callbackExecutor = Executors.newSingleThreadExecutor(); |
| mStorage = storage; |
| mCarBluetoothManager = carBluetoothManager; |
| mCarBluetoothManager.registerCallback(generateCarBleCallback(carBluetoothManager), |
| callbackExecutor); |
| mStorage.setAssociatedDeviceCallback(mAssociatedDeviceCallback); |
| logd(TAG, "ConnectedDeviceManager created successfully."); |
| } |
| |
| /** |
| * Start internal processes and begin discovering devices. Must be called before any |
| * connections can be made using {@link #connectToActiveUserDevice()}. |
| */ |
| public void start() { |
| if (mHasStarted.getAndSet(true)) { |
| reset(); |
| } else { |
| logd(TAG, "Starting ConnectedDeviceManager."); |
| EventLog.onConnectedDeviceManagerStarted(); |
| } |
| mCarBluetoothManager.start(); |
| connectToActiveUserDevice(); |
| } |
| |
| /** Reset internal processes and disconnect any active connections. */ |
| public void reset() { |
| logd(TAG, "Resetting ConnectedDeviceManager."); |
| for (ConnectedDevice device : mConnectedDevices.values()) { |
| removeConnectedDevice(device.getDeviceId()); |
| } |
| mCarBluetoothManager.stop(); |
| mIsConnectingToUserDevice.set(false); |
| if (mOobChannel != null) { |
| mOobChannel.interrupt(); |
| mOobChannel = null; |
| } |
| mAssociationCallback = null; |
| } |
| |
| /** Returns {@link List<ConnectedDevice>} of devices currently connected. */ |
| @NonNull |
| public List<ConnectedDevice> getActiveUserConnectedDevices() { |
| List<ConnectedDevice> activeUserConnectedDevices = new ArrayList<>(); |
| for (ConnectedDevice device : mConnectedDevices.values()) { |
| if (device.isAssociatedWithActiveUser()) { |
| activeUserConnectedDevices.add(device); |
| } |
| } |
| logd(TAG, "Returned " + activeUserConnectedDevices.size() + " active user devices."); |
| return activeUserConnectedDevices; |
| } |
| |
| /** |
| * Register a callback for triggered associated device related events. |
| * |
| * @param callback {@link DeviceAssociationCallback} to register. |
| * @param executor {@link Executor} to execute triggers on. |
| */ |
| public void registerDeviceAssociationCallback(@NonNull DeviceAssociationCallback callback, |
| @NonNull Executor executor) { |
| mDeviceAssociationCallbacks.add(callback, executor); |
| } |
| |
| /** |
| * Unregister a device association callback. |
| * |
| * @param callback {@link DeviceAssociationCallback} to unregister. |
| */ |
| public void unregisterDeviceAssociationCallback(@NonNull DeviceAssociationCallback callback) { |
| mDeviceAssociationCallbacks.remove(callback); |
| } |
| |
| /** |
| * Register a callback for manager triggered connection events for only the currently active |
| * user's devices. |
| * |
| * @param callback {@link ConnectionCallback} to register. |
| * @param executor {@link Executor} to execute triggers on. |
| */ |
| public void registerActiveUserConnectionCallback(@NonNull ConnectionCallback callback, |
| @NonNull Executor executor) { |
| mActiveUserConnectionCallbacks.add(callback, executor); |
| } |
| |
| /** |
| * Unregister a connection callback from manager. |
| * |
| * @param callback {@link ConnectionCallback} to unregister. |
| */ |
| public void unregisterConnectionCallback(ConnectionCallback callback) { |
| mActiveUserConnectionCallbacks.remove(callback); |
| mAllUserConnectionCallbacks.remove(callback); |
| } |
| |
| /** Connect to a device for the active user if available. */ |
| @VisibleForTesting |
| void connectToActiveUserDevice() { |
| Executors.defaultThreadFactory().newThread(() -> { |
| logd(TAG, "Received request to connect to active user's device."); |
| connectToActiveUserDeviceInternal(); |
| }).start(); |
| } |
| |
| private void connectToActiveUserDeviceInternal() { |
| try { |
| boolean isLockAcquired = mIsConnectingToUserDevice.compareAndSet(false, true); |
| if (!isLockAcquired) { |
| logd(TAG, "A request has already been made to connect to this user's device. " |
| + "Ignoring redundant request."); |
| return; |
| } |
| List<AssociatedDevice> userDevices = mStorage.getActiveUserAssociatedDevices(); |
| if (userDevices.isEmpty()) { |
| logw(TAG, "No devices associated with active user. Ignoring."); |
| mIsConnectingToUserDevice.set(false); |
| return; |
| } |
| |
| // Only currently support one device per user for fast association, so take the |
| // first one. |
| AssociatedDevice userDevice = userDevices.get(0); |
| if (!userDevice.isConnectionEnabled()) { |
| logd(TAG, "Connection is disabled on device " + userDevice + "."); |
| mIsConnectingToUserDevice.set(false); |
| return; |
| } |
| if (mConnectedDevices.containsKey(userDevice.getDeviceId())) { |
| logd(TAG, "Device has already been connected. No need to attempt connection " |
| + "again."); |
| mIsConnectingToUserDevice.set(false); |
| return; |
| } |
| EventLog.onStartDeviceSearchStarted(); |
| mCarBluetoothManager.connectToDevice(UUID.fromString(userDevice.getDeviceId())); |
| } catch (Exception e) { |
| loge(TAG, "Exception while attempting connection with active user's device.", e); |
| } |
| } |
| |
| /** |
| * Start the association with a new device. |
| * |
| * @param callback Callback for association events. |
| */ |
| public void startAssociation(@NonNull AssociationCallback callback) { |
| mAssociationCallback = callback; |
| Executors.defaultThreadFactory().newThread(() -> { |
| logd(TAG, "Received request to start association."); |
| mCarBluetoothManager.startAssociation(getNameForAssociation(), |
| mInternalAssociationCallback); |
| }).start(); |
| } |
| |
| /** |
| * Start association with an out of band device. |
| * |
| * @param device The out of band eligible device. |
| * @param callback Callback for association events. |
| */ |
| public void startOutOfBandAssociation(@NonNull OobEligibleDevice device, |
| @NonNull AssociationCallback callback) { |
| logd(TAG, "Received request to start out of band association."); |
| mAssociationCallback = callback; |
| mOobChannel = new BluetoothRfcommChannel(); |
| mOobChannel.completeOobDataExchange(device, new OobChannel.Callback() { |
| @Override |
| public void onOobExchangeSuccess() { |
| logd(TAG, "Out of band exchange succeeded. Proceeding to association with device."); |
| Executors.defaultThreadFactory().newThread(() -> { |
| mCarBluetoothManager.startOutOfBandAssociation( |
| getNameForAssociation(), |
| mOobChannel, mInternalAssociationCallback); |
| }).start(); |
| } |
| |
| @Override |
| public void onOobExchangeFailure() { |
| loge(TAG, "Out of band exchange failed."); |
| mInternalAssociationCallback.onAssociationError( |
| DEVICE_ERROR_INVALID_ENCRYPTION_KEY); |
| mOobChannel = null; |
| mAssociationCallback = null; |
| } |
| }); |
| } |
| |
| /** Stop the association with any device. */ |
| public void stopAssociation(@NonNull AssociationCallback callback) { |
| if (mAssociationCallback != callback) { |
| logd(TAG, "Stop association called with unrecognized callback. Ignoring."); |
| return; |
| } |
| logd(TAG, "Stopping association."); |
| mAssociationCallback = null; |
| mCarBluetoothManager.stopAssociation(); |
| if (mOobChannel != null) { |
| mOobChannel.interrupt(); |
| } |
| mOobChannel = null; |
| } |
| |
| /** |
| * Get a list of associated devices for the given user. |
| * |
| * @return Associated device list. |
| */ |
| @NonNull |
| public List<AssociatedDevice> getActiveUserAssociatedDevices() { |
| return mStorage.getActiveUserAssociatedDevices(); |
| } |
| |
| /** Notify that the user has accepted a pairing code or any out-of-band confirmation. */ |
| public void notifyOutOfBandAccepted() { |
| mCarBluetoothManager.notifyOutOfBandAccepted(); |
| } |
| |
| /** |
| * Remove the associated device with the given device identifier for the current user. |
| * |
| * @param deviceId Device identifier. |
| */ |
| public void removeActiveUserAssociatedDevice(@NonNull String deviceId) { |
| mStorage.removeAssociatedDeviceForActiveUser(deviceId); |
| disconnectDevice(deviceId); |
| } |
| |
| /** |
| * Enable connection on an associated device. |
| * |
| * @param deviceId Device identifier. |
| */ |
| public void enableAssociatedDeviceConnection(@NonNull String deviceId) { |
| logd(TAG, "enableAssociatedDeviceConnection() called on " + deviceId); |
| mStorage.updateAssociatedDeviceConnectionEnabled(deviceId, |
| /* isConnectionEnabled= */ true); |
| |
| connectToActiveUserDevice(); |
| } |
| |
| /** |
| * Disable connection on an associated device. |
| * |
| * @param deviceId Device identifier. |
| */ |
| public void disableAssociatedDeviceConnection(@NonNull String deviceId) { |
| logd(TAG, "disableAssociatedDeviceConnection() called on " + deviceId); |
| mStorage.updateAssociatedDeviceConnectionEnabled(deviceId, |
| /* isConnectionEnabled= */ false); |
| disconnectDevice(deviceId); |
| } |
| |
| private void disconnectDevice(String deviceId) { |
| ConnectedDevice device = mConnectedDevices.get(deviceId); |
| if (device != null) { |
| mCarBluetoothManager.disconnectDevice(deviceId); |
| removeConnectedDevice(deviceId); |
| } |
| } |
| |
| /** |
| * Register a callback for a specific device and recipient. |
| * |
| * @param device {@link ConnectedDevice} to register triggers on. |
| * @param recipientId {@link UUID} to register as recipient of. |
| * @param callback {@link DeviceCallback} to register. |
| * @param executor {@link Executor} on which to execute callback. |
| */ |
| public void registerDeviceCallback(@NonNull ConnectedDevice device, @NonNull UUID recipientId, |
| @NonNull DeviceCallback callback, @NonNull Executor executor) { |
| if (isRecipientBlacklisted(recipientId)) { |
| notifyOfBlacklisting(device, recipientId, callback, executor); |
| return; |
| } |
| logd(TAG, "New callback registered on device " + device.getDeviceId() + " for recipient " |
| + recipientId); |
| String deviceId = device.getDeviceId(); |
| Map<UUID, ThreadSafeCallbacks<DeviceCallback>> recipientCallbacks = |
| mDeviceCallbacks.computeIfAbsent(deviceId, key -> new ConcurrentHashMap<>()); |
| |
| // Device already has a callback registered with this recipient UUID. For the |
| // protection of the user, this UUID is now blacklisted from future subscriptions |
| // and the original subscription is notified and removed. |
| if (recipientCallbacks.containsKey(recipientId)) { |
| blacklistRecipient(deviceId, recipientId); |
| notifyOfBlacklisting(device, recipientId, callback, executor); |
| return; |
| } |
| |
| ThreadSafeCallbacks<DeviceCallback> newCallbacks = new ThreadSafeCallbacks<>(); |
| newCallbacks.add(callback, executor); |
| recipientCallbacks.put(recipientId, newCallbacks); |
| |
| List<byte[]> messages = popMissedMessages(recipientId, device.getDeviceId()); |
| if (messages != null) { |
| for (byte[] message : messages) { |
| newCallbacks.invoke(deviceCallback -> |
| deviceCallback.onMessageReceived(device, message)); |
| } |
| } |
| } |
| |
| /** |
| * Set the delegate for message delivery operations. |
| * |
| * @param delegate The {@link MessageDeliveryDelegate} to set. {@code null} to unset. |
| */ |
| public void setMessageDeliveryDelegate(@Nullable MessageDeliveryDelegate delegate) { |
| mMessageDeliveryDelegate = delegate; |
| } |
| |
| private void notifyOfBlacklisting(@NonNull ConnectedDevice device, @NonNull UUID recipientId, |
| @NonNull DeviceCallback callback, @NonNull Executor executor) { |
| loge(TAG, "Multiple callbacks registered for recipient " + recipientId + "! Your " |
| + "recipient id is no longer secure and has been blocked from future use."); |
| executor.execute(() -> |
| callback.onDeviceError(device, DEVICE_ERROR_INSECURE_RECIPIENT_ID_DETECTED)); |
| } |
| |
| private void saveMissedMessage(@NonNull String deviceId, @NonNull UUID recipientId, |
| @NonNull byte[] message) { |
| // Store last message in case recipient registers callbacks in the future. |
| logd(TAG, "No recipient registered for device " + deviceId + " and recipient " |
| + recipientId + " combination. Saving message."); |
| mRecipientMissedMessages.computeIfAbsent(recipientId, __ -> new HashMap<>()) |
| .computeIfAbsent(deviceId, __ -> new ArrayList<>()).add(message); |
| } |
| |
| /** |
| * Remove the last message sent for this device prior to a {@link DeviceCallback} being |
| * registered. |
| * |
| * @param recipientId Recipient's id |
| * @param deviceId Device id |
| * @return The missed {@code byte[]} messages, or {@code null} if no messages were |
| * missed. |
| */ |
| @Nullable |
| private List<byte[]> popMissedMessages(@NonNull UUID recipientId, @NonNull String deviceId) { |
| Map<String, List<byte[]>> missedMessages = mRecipientMissedMessages.get(recipientId); |
| if (missedMessages == null) { |
| return null; |
| } |
| |
| return missedMessages.remove(deviceId); |
| } |
| |
| /** |
| * Unregister callback from device events. |
| * |
| * @param device {@link ConnectedDevice} callback was registered on. |
| * @param recipientId {@link UUID} callback was registered under. |
| * @param callback {@link DeviceCallback} to unregister. |
| */ |
| public void unregisterDeviceCallback(@NonNull ConnectedDevice device, |
| @NonNull UUID recipientId, @NonNull DeviceCallback callback) { |
| logd(TAG, "Device callback unregistered on device " + device.getDeviceId() + " for " |
| + "recipient " + recipientId + "."); |
| |
| Map<UUID, ThreadSafeCallbacks<DeviceCallback>> recipientCallbacks = |
| mDeviceCallbacks.get(device.getDeviceId()); |
| if (recipientCallbacks == null) { |
| return; |
| } |
| ThreadSafeCallbacks<DeviceCallback> callbacks = recipientCallbacks.get(recipientId); |
| if (callbacks == null) { |
| return; |
| } |
| |
| callbacks.remove(callback); |
| if (callbacks.size() == 0) { |
| recipientCallbacks.remove(recipientId); |
| } |
| } |
| |
| /** |
| * Securely send message to a device. |
| * |
| * @param device {@link ConnectedDevice} to send the message to. |
| * @param recipientId Recipient {@link UUID}. |
| * @param message Message to send. |
| * @throws IllegalStateException Secure channel has not been established. |
| */ |
| public void sendMessageSecurely(@NonNull ConnectedDevice device, @NonNull UUID recipientId, |
| @NonNull byte[] message) throws IllegalStateException { |
| sendMessage(device, recipientId, message, /* isEncrypted= */ true); |
| } |
| |
| /** |
| * Send an unencrypted message to a device. |
| * |
| * @param device {@link ConnectedDevice} to send the message to. |
| * @param recipientId Recipient {@link UUID}. |
| * @param message Message to send. |
| */ |
| public void sendMessageUnsecurely(@NonNull ConnectedDevice device, @NonNull UUID recipientId, |
| @NonNull byte[] message) { |
| sendMessage(device, recipientId, message, /* isEncrypted= */ false); |
| } |
| |
| private void sendMessage(@NonNull ConnectedDevice device, @NonNull UUID recipientId, |
| @NonNull byte[] message, boolean isEncrypted) throws IllegalStateException { |
| String deviceId = device.getDeviceId(); |
| logd(TAG, "Sending new message to device " + deviceId + " for " + recipientId |
| + " containing " + message.length + ". Message will be sent securely: " |
| + isEncrypted + "."); |
| |
| ConnectedDevice connectedDevice = mConnectedDevices.get(deviceId); |
| if (connectedDevice == null) { |
| loge(TAG, "Attempted to send message to unknown device " + deviceId + ". Ignoring."); |
| return; |
| } |
| |
| if (isEncrypted && !connectedDevice.hasSecureChannel()) { |
| throw new IllegalStateException("Cannot send a message securely to device that has not " |
| + "established a secure channel."); |
| } |
| |
| mCarBluetoothManager.sendMessage(deviceId, new DeviceMessage(recipientId, isEncrypted, |
| message)); |
| } |
| |
| private boolean isRecipientBlacklisted(UUID recipientId) { |
| return mBlacklistedRecipients.contains(recipientId); |
| } |
| |
| private void blacklistRecipient(@NonNull String deviceId, @NonNull UUID recipientId) { |
| Map<UUID, ThreadSafeCallbacks<DeviceCallback>> recipientCallbacks = |
| mDeviceCallbacks.get(deviceId); |
| if (recipientCallbacks == null) { |
| // Should never happen, but null-safety check. |
| return; |
| } |
| |
| ThreadSafeCallbacks<DeviceCallback> existingCallback = recipientCallbacks.get(recipientId); |
| if (existingCallback == null) { |
| // Should never happen, but null-safety check. |
| return; |
| } |
| |
| ConnectedDevice connectedDevice = mConnectedDevices.get(deviceId); |
| if (connectedDevice != null) { |
| recipientCallbacks.get(recipientId).invoke( |
| callback -> |
| callback.onDeviceError(connectedDevice, |
| DEVICE_ERROR_INSECURE_RECIPIENT_ID_DETECTED) |
| ); |
| } |
| |
| recipientCallbacks.remove(recipientId); |
| mBlacklistedRecipients.add(recipientId); |
| } |
| |
| @VisibleForTesting |
| void addConnectedDevice(@NonNull String deviceId) { |
| if (mConnectedDevices.containsKey(deviceId)) { |
| // Device already connected. No-op until secure channel established. |
| return; |
| } |
| logd(TAG, "New device with id " + deviceId + " connected."); |
| ConnectedDevice connectedDevice = new ConnectedDevice( |
| deviceId, |
| /* deviceName= */ null, |
| mStorage.getActiveUserAssociatedDeviceIds().contains(deviceId), |
| /* hasSecureChannel= */ false |
| ); |
| |
| mConnectedDevices.put(deviceId, connectedDevice); |
| invokeConnectionCallbacks(connectedDevice.isAssociatedWithActiveUser(), |
| callback -> callback.onDeviceConnected(connectedDevice)); |
| } |
| |
| @VisibleForTesting |
| void removeConnectedDevice(@NonNull String deviceId) { |
| logd(TAG, "Device " + deviceId + " disconnected."); |
| ConnectedDevice connectedDevice = mConnectedDevices.get(deviceId); |
| mIsConnectingToUserDevice.set(false); |
| if (connectedDevice == null) { |
| return; |
| } |
| |
| mConnectedDevices.remove(deviceId); |
| boolean isAssociated = connectedDevice.isAssociatedWithActiveUser(); |
| invokeConnectionCallbacks(isAssociated, |
| callback -> callback.onDeviceDisconnected(connectedDevice)); |
| |
| if (isAssociated || mConnectedDevices.isEmpty()) { |
| // Try to regain connection to active user's device. |
| connectToActiveUserDevice(); |
| } |
| } |
| |
| @VisibleForTesting |
| void onSecureChannelEstablished(@NonNull String deviceId) { |
| if (mConnectedDevices.get(deviceId) == null) { |
| loge(TAG, "Secure channel established on unknown device " + deviceId + "."); |
| return; |
| } |
| ConnectedDevice connectedDevice = mConnectedDevices.get(deviceId); |
| ConnectedDevice updatedConnectedDevice = new ConnectedDevice(connectedDevice.getDeviceId(), |
| connectedDevice.getDeviceName(), connectedDevice.isAssociatedWithActiveUser(), |
| /* hasSecureChannel= */ true); |
| |
| boolean notifyCallbacks = mConnectedDevices.get(deviceId) != null; |
| |
| // TODO (b/143088482) Implement interrupt |
| // Ignore if central already holds the active device connection and interrupt the |
| // connection. |
| |
| mConnectedDevices.put(deviceId, updatedConnectedDevice); |
| logd(TAG, "Secure channel established to " + deviceId + " . Notifying callbacks: " |
| + notifyCallbacks + "."); |
| if (notifyCallbacks) { |
| notifyAllDeviceCallbacks(deviceId, |
| callback -> callback.onSecureChannelEstablished(updatedConnectedDevice)); |
| } |
| } |
| |
| @VisibleForTesting |
| void onMessageReceived(@NonNull String deviceId, @NonNull DeviceMessage message) { |
| logd(TAG, "New message received from device " + deviceId + " intended for " |
| + message.getRecipient() + " containing " + message.getMessage().length |
| + " bytes."); |
| |
| ConnectedDevice connectedDevice = mConnectedDevices.get(deviceId); |
| if (connectedDevice == null) { |
| logw(TAG, "Received message from unknown device " + deviceId + "or to unknown " |
| + "recipient " + message.getRecipient() + "."); |
| return; |
| } |
| |
| if (mMessageDeliveryDelegate != null |
| && !mMessageDeliveryDelegate.shouldDeliverMessageForDevice(connectedDevice)) { |
| logw(TAG, "The message delegate has rejected this message. It will not be " |
| + "delivered to the intended recipient."); |
| return; |
| } |
| |
| UUID recipientId = message.getRecipient(); |
| Map<UUID, ThreadSafeCallbacks<DeviceCallback>> deviceCallbacks = |
| mDeviceCallbacks.get(deviceId); |
| if (deviceCallbacks == null) { |
| saveMissedMessage(deviceId, recipientId, message.getMessage()); |
| return; |
| } |
| ThreadSafeCallbacks<DeviceCallback> recipientCallbacks = |
| deviceCallbacks.get(recipientId); |
| if (recipientCallbacks == null) { |
| saveMissedMessage(deviceId, recipientId, message.getMessage()); |
| return; |
| } |
| |
| recipientCallbacks.invoke( |
| callback -> callback.onMessageReceived(connectedDevice, message.getMessage())); |
| } |
| |
| @VisibleForTesting |
| void deviceErrorOccurred(@NonNull String deviceId) { |
| ConnectedDevice connectedDevice = mConnectedDevices.get(deviceId); |
| if (connectedDevice == null) { |
| logw(TAG, "Failed to establish secure channel on unknown device " + deviceId + "."); |
| return; |
| } |
| |
| notifyAllDeviceCallbacks(deviceId, callback -> callback.onDeviceError(connectedDevice, |
| DEVICE_ERROR_INVALID_SECURITY_KEY)); |
| } |
| |
| @VisibleForTesting |
| void onAssociationCompleted(@NonNull String deviceId) { |
| ConnectedDevice connectedDevice = mConnectedDevices.get(deviceId); |
| if (connectedDevice == null) { |
| return; |
| } |
| |
| // The previous device is now obsolete and should be replaced with a new one properly |
| // reflecting the state of belonging to the active user and notify features. |
| if (connectedDevice.isAssociatedWithActiveUser()) { |
| // Device was already marked as belonging to active user. No need to reissue callbacks. |
| return; |
| } |
| removeConnectedDevice(deviceId); |
| addConnectedDevice(deviceId); |
| } |
| |
| @NonNull |
| private List<String> getActiveUserDeviceIds() { |
| return mStorage.getActiveUserAssociatedDeviceIds(); |
| } |
| |
| private void invokeConnectionCallbacks(boolean belongsToActiveUser, |
| @NonNull Consumer<ConnectionCallback> notification) { |
| logd(TAG, "Notifying connection callbacks for device belonging to active user " |
| + belongsToActiveUser + "."); |
| if (belongsToActiveUser) { |
| mActiveUserConnectionCallbacks.invoke(notification); |
| } |
| mAllUserConnectionCallbacks.invoke(notification); |
| } |
| |
| private void notifyAllDeviceCallbacks(@NonNull String deviceId, |
| @NonNull Consumer<DeviceCallback> notification) { |
| logd(TAG, "Notifying all device callbacks for device " + deviceId + "."); |
| Map<UUID, ThreadSafeCallbacks<DeviceCallback>> deviceCallbacks = |
| mDeviceCallbacks.get(deviceId); |
| if (deviceCallbacks == null) { |
| return; |
| } |
| |
| for (ThreadSafeCallbacks<DeviceCallback> callbacks : deviceCallbacks.values()) { |
| callbacks.invoke(notification); |
| } |
| } |
| |
| /** |
| * Returns the name that should be used for the device during enrollment of a trusted device. |
| * |
| * <p>The returned name will be a combination of a prefix sysprop and randomized digits. |
| */ |
| @NonNull |
| private String getNameForAssociation() { |
| if (mNameForAssociation == null) { |
| mNameForAssociation = ByteUtils.generateRandomNumberString(DEVICE_NAME_LENGTH_LIMIT); |
| } |
| return mNameForAssociation; |
| } |
| |
| @NonNull |
| private CarBluetoothManager.Callback generateCarBleCallback( |
| @NonNull CarBluetoothManager carBluetoothManager) { |
| return new CarBluetoothManager.Callback() { |
| @Override |
| public void onDeviceConnected(String deviceId) { |
| EventLog.onDeviceIdReceived(); |
| addConnectedDevice(deviceId); |
| } |
| |
| @Override |
| public void onDeviceDisconnected(String deviceId) { |
| removeConnectedDevice(deviceId); |
| } |
| |
| @Override |
| public void onSecureChannelEstablished(String deviceId) { |
| EventLog.onSecureChannelEstablished(); |
| ConnectedDeviceManager.this.onSecureChannelEstablished(deviceId); |
| } |
| |
| @Override |
| public void onMessageReceived(String deviceId, DeviceMessage message) { |
| ConnectedDeviceManager.this.onMessageReceived(deviceId, message); |
| } |
| |
| @Override |
| public void onSecureChannelError(String deviceId) { |
| deviceErrorOccurred(deviceId); |
| } |
| }; |
| } |
| |
| private final AssociationCallback mInternalAssociationCallback = new AssociationCallback() { |
| @Override |
| public void onAssociationStartSuccess(String deviceName) { |
| if (mAssociationCallback != null) { |
| mAssociationCallback.onAssociationStartSuccess(deviceName); |
| } |
| } |
| |
| @Override |
| public void onAssociationStartFailure() { |
| if (mAssociationCallback != null) { |
| mAssociationCallback.onAssociationStartFailure(); |
| } |
| } |
| |
| @Override |
| public void onAssociationError(int error) { |
| if (mAssociationCallback != null) { |
| mAssociationCallback.onAssociationError(error); |
| } |
| } |
| |
| @Override |
| public void onVerificationCodeAvailable(String code) { |
| if (mAssociationCallback != null) { |
| mAssociationCallback.onVerificationCodeAvailable(code); |
| } |
| } |
| |
| @Override |
| public void onAssociationCompleted(String deviceId) { |
| if (mAssociationCallback != null) { |
| mAssociationCallback.onAssociationCompleted(deviceId); |
| } |
| ConnectedDeviceManager.this.onAssociationCompleted(deviceId); |
| } |
| }; |
| |
| private final AssociatedDeviceCallback mAssociatedDeviceCallback = |
| new AssociatedDeviceCallback() { |
| @Override |
| public void onAssociatedDeviceAdded(AssociatedDevice device) { |
| mDeviceAssociationCallbacks.invoke(callback -> |
| callback.onAssociatedDeviceAdded(device)); |
| } |
| |
| @Override |
| public void onAssociatedDeviceRemoved(AssociatedDevice device) { |
| mDeviceAssociationCallbacks.invoke(callback -> |
| callback.onAssociatedDeviceRemoved(device)); |
| logd(TAG, "Successfully removed associated device " + device + "."); |
| } |
| |
| @Override |
| public void onAssociatedDeviceUpdated(AssociatedDevice device) { |
| mDeviceAssociationCallbacks.invoke(callback -> |
| callback.onAssociatedDeviceUpdated(device)); |
| } |
| }; |
| |
| /** Callback for triggered connection events from {@link ConnectedDeviceManager}. */ |
| public interface ConnectionCallback { |
| /** Triggered when a new device has connected. */ |
| void onDeviceConnected(@NonNull ConnectedDevice device); |
| |
| /** Triggered when a device has disconnected. */ |
| void onDeviceDisconnected(@NonNull ConnectedDevice device); |
| } |
| |
| /** Triggered device events for a connected device from {@link ConnectedDeviceManager}. */ |
| public interface DeviceCallback { |
| /** |
| * Triggered when secure channel has been established on a device. Encrypted messaging now |
| * available. |
| */ |
| void onSecureChannelEstablished(@NonNull ConnectedDevice device); |
| |
| /** Triggered when a new message is received from a device. */ |
| void onMessageReceived(@NonNull ConnectedDevice device, @NonNull byte[] message); |
| |
| /** Triggered when an error has occurred for a device. */ |
| void onDeviceError(@NonNull ConnectedDevice device, @DeviceError int error); |
| } |
| |
| /** Callback for association device related events. */ |
| public interface DeviceAssociationCallback { |
| |
| /** Triggered when an associated device has been added. */ |
| void onAssociatedDeviceAdded(@NonNull AssociatedDevice device); |
| |
| /** Triggered when an associated device has been removed. */ |
| void onAssociatedDeviceRemoved(@NonNull AssociatedDevice device); |
| |
| /** Triggered when the name of an associated device has been updated. */ |
| void onAssociatedDeviceUpdated(@NonNull AssociatedDevice device); |
| } |
| |
| /** Delegate for message delivery operations. */ |
| public interface MessageDeliveryDelegate { |
| |
| /** Indicate whether a message should be delivered for the specified device. */ |
| boolean shouldDeliverMessageForDevice(@NonNull ConnectedDevice device); |
| } |
| } |
