Special case & sanitize exposure notification results
Bug: 162031802
Tag: #feature
Test: verified do not get results before this change,
and after the change, get results but only the
RSSI & payload for EN
Change-Id: I9dca7d398ecc1543fc001921deb95c07b1b84e15
(cherry picked from commit a79caa334896377c5247fa02b83a71abc8973a58)
diff --git a/res/values/config.xml b/res/values/config.xml
index c73d7e6..6ceacf7 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -114,4 +114,7 @@
<!-- Flag whether or not to keep polling AG with CLCC for call information every 2 seconds -->
<bool name="hfp_clcc_poll_during_call">true</bool>
+ <!-- Package that is providing the exposure notification service -->
+ <string name="exposure_notification_package">com.google.android.gms</string>
+
</resources>
diff --git a/src/com/android/bluetooth/gatt/ContextMap.java b/src/com/android/bluetooth/gatt/ContextMap.java
index 987f2ef..0d82eba 100644
--- a/src/com/android/bluetooth/gatt/ContextMap.java
+++ b/src/com/android/bluetooth/gatt/ContextMap.java
@@ -107,6 +107,8 @@
/** Whether the calling app has the network setup wizard permission */
boolean mHasScanWithoutLocationPermission;
+ boolean mEligibleForSanitizedExposureNotification;
+
public List<String> mAssociatedDevices;
/** Internal callback info queue, waiting to be send on congestion clear */
diff --git a/src/com/android/bluetooth/gatt/GattService.java b/src/com/android/bluetooth/gatt/GattService.java
index 0c29f59..87e6e52 100644
--- a/src/com/android/bluetooth/gatt/GattService.java
+++ b/src/com/android/bluetooth/gatt/GattService.java
@@ -56,6 +56,7 @@
import android.os.SystemClock;
import android.os.UserHandle;
import android.os.WorkSource;
+import android.provider.Settings;
import android.util.Log;
import com.android.bluetooth.BluetoothMetricsProto;
@@ -185,6 +186,7 @@
private ScanManager mScanManager;
private AppOpsManager mAppOps;
private ICompanionDeviceManager mCompanionManager;
+ private String mExposureNotificationPackage;
private static GattService sGattService;
@@ -207,6 +209,9 @@
if (DBG) {
Log.d(TAG, "start()");
}
+ mExposureNotificationPackage = getString(R.string.exposure_notification_package);
+ Settings.Global.putInt(
+ getContentResolver(), "bluetooth_sanitized_exposure_notification_supported", 1);
initializeNative();
mAdapter = BluetoothAdapter.getDefaultAdapter();
mCompanionManager = ICompanionDeviceManager.Stub.asInterface(
@@ -960,6 +965,56 @@
* Callback functions - CLIENT
*************************************************************************/
+ // EN format defined here:
+ // https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
+ private static final byte[] EXPOSURE_NOTIFICATION_FLAGS_PREAMBLE = new byte[] {
+ // size 2, flag field, flags byte (value is not important)
+ (byte) 0x02, (byte) 0x01
+ };
+ private static final int EXPOSURE_NOTIFICATION_FLAGS_LENGTH = 0x2 + 1;
+ private static final byte[] EXPOSURE_NOTIFICATION_PAYLOAD_PREAMBLE = new byte[] {
+ // size 3, complete 16 bit UUID, EN UUID
+ (byte) 0x03, (byte) 0x03, (byte) 0x6F, (byte) 0xFD,
+ // size 23, data for 16 bit UUID, EN UUID
+ (byte) 0x17, (byte) 0x16, (byte) 0x6F, (byte) 0xFD,
+ // ...payload
+ };
+ private static final int EXPOSURE_NOTIFICATION_PAYLOAD_LENGTH = 0x03 + 0x17 + 2;
+
+ private static boolean arrayStartsWith(byte[] array, byte[] prefix) {
+ if (array.length < prefix.length) {
+ return false;
+ }
+ for (int i = 0; i < prefix.length; i++) {
+ if (prefix[i] != array[i]) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ ScanResult getSanitizedExposureNotification(ScanResult result) {
+ ScanRecord record = result.getScanRecord();
+ // Remove the flags part of the payload, if present
+ if (record.getBytes().length > EXPOSURE_NOTIFICATION_FLAGS_LENGTH
+ && arrayStartsWith(record.getBytes(), EXPOSURE_NOTIFICATION_FLAGS_PREAMBLE)) {
+ record = ScanRecord.parseFromBytes(
+ Arrays.copyOfRange(
+ record.getBytes(),
+ EXPOSURE_NOTIFICATION_FLAGS_LENGTH,
+ record.getBytes().length));
+ }
+
+ if (record.getBytes().length != EXPOSURE_NOTIFICATION_PAYLOAD_LENGTH) {
+ return null;
+ }
+ if (!arrayStartsWith(record.getBytes(), EXPOSURE_NOTIFICATION_PAYLOAD_PREAMBLE)) {
+ return null;
+ }
+
+ return new ScanResult(null, 0, 0, 0, 0, 0, result.getRssi(), 0, record, 0);
+ }
+
void onScanResult(int eventType, int addressType, String address, int primaryPhy,
int secondaryPhy, int advertisingSid, int txPower, int rssi, int periodicAdvInt,
byte[] advData) {
@@ -1027,6 +1082,13 @@
}
}
}
+ if (!hasPermission && client.eligibleForSanitizedExposureNotification) {
+ ScanResult sanitized = getSanitizedExposureNotification(result);
+ if (sanitized != null) {
+ hasPermission = true;
+ result = sanitized;
+ }
+ }
if (!hasPermission || !matchesFilters(client, result)) {
continue;
}
@@ -1986,6 +2048,8 @@
final ScanClient scanClient = new ScanClient(scannerId, settings, filters, storages);
scanClient.userHandle = UserHandle.of(UserHandle.getCallingUserId());
mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
+ scanClient.eligibleForSanitizedExposureNotification =
+ callingPackage.equals(mExposureNotificationPackage);
scanClient.isQApp = Utils.isQApp(this, callingPackage);
if (scanClient.isQApp) {
scanClient.hasLocationPermission = Utils.checkCallerHasFineLocation(this, mAppOps,
@@ -2046,6 +2110,8 @@
ScannerMap.App app = mScannerMap.add(uuid, null, null, piInfo, this);
app.mUserHandle = UserHandle.of(UserHandle.getCallingUserId());
mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
+ app.mEligibleForSanitizedExposureNotification =
+ callingPackage.equals(mExposureNotificationPackage);
app.mIsQApp = Utils.isQApp(this, callingPackage);
try {
if (app.mIsQApp) {
@@ -2076,6 +2142,8 @@
scanClient.hasLocationPermission = app.hasLocationPermission;
scanClient.userHandle = app.mUserHandle;
scanClient.isQApp = app.mIsQApp;
+ scanClient.eligibleForSanitizedExposureNotification =
+ app.mEligibleForSanitizedExposureNotification;
scanClient.hasNetworkSettingsPermission = app.mHasNetworkSettingsPermission;
scanClient.hasNetworkSetupWizardPermission = app.mHasNetworkSetupWizardPermission;
scanClient.hasScanWithoutLocationPermission = app.mHasScanWithoutLocationPermission;
diff --git a/src/com/android/bluetooth/gatt/ScanClient.java b/src/com/android/bluetooth/gatt/ScanClient.java
index 9b8b77a..9f17cc0 100644
--- a/src/com/android/bluetooth/gatt/ScanClient.java
+++ b/src/com/android/bluetooth/gatt/ScanClient.java
@@ -44,6 +44,7 @@
public boolean hasLocationPermission;
public UserHandle userHandle;
public boolean isQApp;
+ public boolean eligibleForSanitizedExposureNotification;
public boolean hasNetworkSettingsPermission;
public boolean hasNetworkSetupWizardPermission;
public boolean hasScanWithoutLocationPermission;
