| /* |
| * Copyright 2016, 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.server.telecom; |
| |
| import android.Manifest; |
| import android.content.Context; |
| import android.content.pm.PackageManager; |
| import android.os.UserHandle; |
| import android.telecom.Log; |
| import android.telecom.PhoneAccountHandle; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| /** |
| * Helps with emergency calls by: |
| * 1. granting temporary location permission to the system dialer service during emergency calls |
| * 2. keeping track of the time of the last emergency call |
| */ |
| @VisibleForTesting |
| public class EmergencyCallHelper { |
| private final Context mContext; |
| private final DefaultDialerCache mDefaultDialerCache; |
| private final Timeouts.Adapter mTimeoutsAdapter; |
| private UserHandle mLocationPermissionGrantedToUser; |
| private PhoneAccountHandle mLastOutgoingEmergencyCallPAH; |
| |
| //stores the original state of permissions that dialer had |
| private boolean mHadFineLocation = false; |
| private boolean mHadBackgroundLocation = false; |
| |
| //stores whether we successfully granted the runtime permission |
| //This is stored so we don't unnecessarily revoke if the grant had failed with an exception. |
| //Else we will get an exception |
| private boolean mFineLocationGranted= false; |
| private boolean mBackgroundLocationGranted = false; |
| |
| private long mLastEmergencyCallTimestampMillis; |
| private long mLastOutgoingEmergencyCallTimestampMillis; |
| |
| @VisibleForTesting |
| public EmergencyCallHelper( |
| Context context, |
| DefaultDialerCache defaultDialerCache, |
| Timeouts.Adapter timeoutsAdapter) { |
| mContext = context; |
| mDefaultDialerCache = defaultDialerCache; |
| mTimeoutsAdapter = timeoutsAdapter; |
| } |
| |
| @VisibleForTesting |
| public void maybeGrantTemporaryLocationPermission(Call call, UserHandle userHandle) { |
| if (shouldGrantTemporaryLocationPermission(call)) { |
| grantLocationPermission(userHandle); |
| } |
| if (call != null && call.isEmergencyCall()) { |
| recordEmergencyCall(call); |
| } |
| } |
| |
| @VisibleForTesting |
| public void maybeRevokeTemporaryLocationPermission() { |
| if (wasGrantedTemporaryLocationPermission()) { |
| revokeLocationPermission(); |
| } |
| } |
| |
| long getLastEmergencyCallTimeMillis() { |
| return mLastEmergencyCallTimestampMillis; |
| } |
| |
| @VisibleForTesting |
| public void setLastOutgoingEmergencyCallTimestampMillis(long timestampMillis) { |
| mLastOutgoingEmergencyCallTimestampMillis = timestampMillis; |
| } |
| |
| @VisibleForTesting |
| public void setLastOutgoingEmergencyCallPAH(PhoneAccountHandle accountHandle) { |
| mLastOutgoingEmergencyCallPAH = accountHandle; |
| } |
| |
| @VisibleForTesting |
| public boolean isLastOutgoingEmergencyCallPAH(PhoneAccountHandle currentCallHandle) { |
| boolean ecbmActive = mLastOutgoingEmergencyCallPAH != null |
| && isInEmergencyCallbackWindow(mLastOutgoingEmergencyCallTimestampMillis) |
| && currentCallHandle != null |
| && currentCallHandle.equals(mLastOutgoingEmergencyCallPAH); |
| if (ecbmActive) { |
| Log.i(this, "ECBM is enabled for %s. The last recorded call timestamp was at %s", |
| currentCallHandle, mLastOutgoingEmergencyCallTimestampMillis); |
| } |
| |
| return ecbmActive; |
| } |
| |
| boolean isInEmergencyCallbackWindow(long lastEmergencyCallTimestampMillis) { |
| return System.currentTimeMillis() - lastEmergencyCallTimestampMillis |
| < mTimeoutsAdapter.getEmergencyCallbackWindowMillis(mContext.getContentResolver()); |
| } |
| |
| private void recordEmergencyCall(Call call) { |
| mLastEmergencyCallTimestampMillis = System.currentTimeMillis(); |
| if (!call.isIncoming()) { |
| // ECBM is applicable to MO emergency calls |
| mLastOutgoingEmergencyCallTimestampMillis = mLastEmergencyCallTimestampMillis; |
| mLastOutgoingEmergencyCallPAH = call.getTargetPhoneAccount(); |
| } |
| } |
| |
| private boolean shouldGrantTemporaryLocationPermission(Call call) { |
| if (!mContext.getResources().getBoolean(R.bool.grant_location_permission_enabled)) { |
| Log.i(this, "ShouldGrantTemporaryLocationPermission, disabled by config"); |
| return false; |
| } |
| if (call == null) { |
| Log.i(this, "ShouldGrantTemporaryLocationPermission, no call"); |
| return false; |
| } |
| if (!call.isEmergencyCall() && !isInEmergencyCallbackWindow( |
| getLastEmergencyCallTimeMillis())) { |
| Log.i(this, "ShouldGrantTemporaryLocationPermission, not emergency"); |
| return false; |
| } |
| Log.i(this, "ShouldGrantTemporaryLocationPermission, returning true"); |
| return true; |
| } |
| |
| private void grantLocationPermission(UserHandle userHandle) { |
| String systemDialerPackage = mDefaultDialerCache.getSystemDialerApplication(); |
| Log.i(this, "Attempting to grant temporary location permission to " + systemDialerPackage |
| + ", user: " + userHandle); |
| |
| boolean hadBackgroundLocation = hasBackgroundLocationPermission(); |
| boolean hadFineLocation = hasFineLocationPermission(); |
| if (hadBackgroundLocation && hadFineLocation) { |
| Log.i(this, "Skipping location grant because the system dialer already" |
| + " holds sufficient permissions"); |
| return; |
| } |
| mHadFineLocation = hadFineLocation; |
| mHadBackgroundLocation = hadBackgroundLocation; |
| |
| if (!hadFineLocation) { |
| try { |
| mContext.getPackageManager().grantRuntimePermission(systemDialerPackage, |
| Manifest.permission.ACCESS_FINE_LOCATION, userHandle); |
| recordFineLocationPermissionGrant(userHandle); |
| } catch (Exception e) { |
| Log.i(this, "Failed to grant ACCESS_FINE_LOCATION"); |
| } |
| } |
| if (!hadBackgroundLocation) { |
| try { |
| mContext.getPackageManager().grantRuntimePermission(systemDialerPackage, |
| Manifest.permission.ACCESS_BACKGROUND_LOCATION, userHandle); |
| recordBackgroundLocationPermissionGrant(userHandle); |
| } catch (Exception e) { |
| Log.i(this, "Failed to grant ACCESS_BACKGROUND_LOCATION"); |
| } |
| } |
| } |
| |
| private void revokeLocationPermission() { |
| String systemDialerPackage = mDefaultDialerCache.getSystemDialerApplication(); |
| Log.i(this, "Revoking temporary location permission from " + systemDialerPackage |
| + ", user: " + mLocationPermissionGrantedToUser); |
| UserHandle userHandle = mLocationPermissionGrantedToUser; |
| |
| try { |
| if (!mHadFineLocation && mFineLocationGranted) { |
| mContext.getPackageManager().revokeRuntimePermission(systemDialerPackage, |
| Manifest.permission.ACCESS_FINE_LOCATION, userHandle); |
| } |
| } catch (Exception e) { |
| Log.e(this, e, "Failed to revoke location permission from " + systemDialerPackage |
| + ", user: " + userHandle); |
| } |
| |
| try { |
| if (!mHadBackgroundLocation && mBackgroundLocationGranted) { |
| mContext.getPackageManager().revokeRuntimePermission(systemDialerPackage, |
| Manifest.permission.ACCESS_BACKGROUND_LOCATION, userHandle); |
| } |
| } catch (Exception e) { |
| Log.e(this, e, "Failed to revoke location permission from " + systemDialerPackage |
| + ", user: " + userHandle); |
| } |
| |
| clearPermissionGrant(); |
| } |
| |
| private boolean hasBackgroundLocationPermission() { |
| return mContext.getPackageManager().checkPermission( |
| Manifest.permission.ACCESS_BACKGROUND_LOCATION, |
| mDefaultDialerCache.getSystemDialerApplication()) |
| == PackageManager.PERMISSION_GRANTED; |
| } |
| |
| private boolean hasFineLocationPermission() { |
| return mContext.getPackageManager().checkPermission( |
| Manifest.permission.ACCESS_FINE_LOCATION, |
| mDefaultDialerCache.getSystemDialerApplication()) |
| == PackageManager.PERMISSION_GRANTED; |
| } |
| |
| private void recordBackgroundLocationPermissionGrant(UserHandle userHandle) { |
| mLocationPermissionGrantedToUser = userHandle; |
| mBackgroundLocationGranted = true; |
| } |
| |
| private void recordFineLocationPermissionGrant(UserHandle userHandle) { |
| mLocationPermissionGrantedToUser = userHandle; |
| mFineLocationGranted = true; |
| } |
| |
| private boolean wasGrantedTemporaryLocationPermission() { |
| return mLocationPermissionGrantedToUser != null; |
| } |
| |
| private void clearPermissionGrant() { |
| mLocationPermissionGrantedToUser = null; |
| mHadBackgroundLocation = false; |
| mHadFineLocation = false; |
| mBackgroundLocationGranted = false; |
| mFineLocationGranted = false; |
| } |
| } |