1 /* 2 * Copyright (C) 2023 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 17 package com.android.nfc.cardemulation; 18 19 import android.app.role.OnRoleHoldersChangedListener; 20 import android.app.role.RoleManager; 21 import android.content.Context; 22 import android.os.Binder; 23 import android.os.UserHandle; 24 import android.permission.flags.Flags; 25 import android.util.Log; 26 27 import com.android.internal.annotations.VisibleForTesting; 28 import com.android.nfc.NfcEventLog; 29 import com.android.nfc.NfcInjector; 30 import com.android.nfc.proto.NfcEventProto; 31 32 import java.util.List; 33 34 public class WalletRoleObserver { 35 private static final String TAG = "WalletRoleObserver"; 36 37 public interface Callback { onWalletRoleHolderChanged(String holder, int userId)38 void onWalletRoleHolderChanged(String holder, int userId); 39 } 40 private Context mContext; 41 private NfcEventLog mNfcEventLog; 42 private RoleManager mRoleManager; 43 @VisibleForTesting 44 final OnRoleHoldersChangedListener mOnRoleHoldersChangedListener; 45 private Callback mCallback; 46 WalletRoleObserver(Context context, RoleManager roleManager, Callback callback, NfcInjector nfcInjector)47 public WalletRoleObserver(Context context, RoleManager roleManager, 48 Callback callback, NfcInjector nfcInjector) { 49 this.mContext = context; 50 this.mRoleManager = roleManager; 51 this.mCallback = callback; 52 this.mNfcEventLog = nfcInjector.getNfcEventLog(); 53 this.mOnRoleHoldersChangedListener = (roleName, user) -> { 54 if (!roleName.equals(RoleManager.ROLE_WALLET)) { 55 return; 56 } 57 List<String> roleHolders = roleManager.getRoleHolders(RoleManager.ROLE_WALLET); 58 String roleHolder = roleHolders.isEmpty() ? null : roleHolders.get(0); 59 Log.i(TAG, "Wallet role changed for user " + user.getIdentifier() + " to " 60 + roleHolder); 61 mNfcEventLog.logEvent( 62 NfcEventProto.EventType.newBuilder() 63 .setWalletRoleHolderChange( 64 NfcEventProto.NfcWalletRoleHolderChange.newBuilder() 65 .setPackageName(roleHolder != null ? roleHolder : "none") 66 .build()) 67 .build()); 68 callback.onWalletRoleHolderChanged(roleHolder, user.getIdentifier()); 69 }; 70 this.mRoleManager.addOnRoleHoldersChangedListenerAsUser(context.getMainExecutor(), 71 mOnRoleHoldersChangedListener, UserHandle.ALL); 72 } 73 getDefaultWalletRoleHolder(int userId)74 public String getDefaultWalletRoleHolder(int userId) { 75 final long token = Binder.clearCallingIdentity(); 76 try { 77 if (!mRoleManager.isRoleAvailable(RoleManager.ROLE_WALLET)) { 78 return null; 79 } 80 List<String> roleHolders = mRoleManager.getRoleHoldersAsUser(RoleManager.ROLE_WALLET, 81 UserHandle.of(userId)); 82 return roleHolders.isEmpty() ? null : roleHolders.get(0); 83 } finally { 84 Binder.restoreCallingIdentity(token); 85 } 86 } 87 isWalletRoleFeatureEnabled()88 boolean isWalletRoleFeatureEnabled() { 89 final long token = Binder.clearCallingIdentity(); 90 try { 91 return Flags.walletRoleEnabled(); 92 } finally { 93 Binder.restoreCallingIdentity(token); 94 } 95 } 96 onUserSwitched(int userId)97 public void onUserSwitched(int userId) { 98 String roleHolder = getDefaultWalletRoleHolder(userId); 99 Log.i(TAG, "Wallet role for user " + userId + ": " + roleHolder); 100 mCallback.onWalletRoleHolderChanged(roleHolder, userId); 101 } 102 } 103