1 /* 2 * Copyright (C) 2011 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_extras; 18 19 import android.annotation.SdkConstant; 20 import android.annotation.SdkConstant.SdkConstantType; 21 import android.os.Binder; 22 import android.os.Bundle; 23 import android.os.RemoteException; 24 25 import java.io.IOException; 26 27 public class NfcExecutionEnvironment { 28 private final NfcAdapterExtras mExtras; 29 private final Binder mToken; 30 31 // Exception types that can be thrown by NfcService 32 // 1:1 mapped to EE_ERROR_ types in NfcService 33 private static final int EE_ERROR_IO = -1; 34 private static final int EE_ERROR_ALREADY_OPEN = -2; 35 private static final int EE_ERROR_INIT = -3; 36 private static final int EE_ERROR_LISTEN_MODE = -4; 37 private static final int EE_ERROR_EXT_FIELD = -5; 38 private static final int EE_ERROR_NFC_DISABLED = -6; 39 40 /** 41 * Broadcast Action: An ISO-DEP AID was selected. 42 * 43 * <p>This happens as the result of a 'SELECT AID' command from an 44 * external NFC reader/writer. 45 * 46 * <p>Always contains the extra field {@link #EXTRA_AID} 47 * 48 * <p class="note"> 49 * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission 50 * to receive. 51 */ 52 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 53 public static final String ACTION_AID_SELECTED = 54 "com.android.nfc_extras.action.AID_SELECTED"; 55 56 /** 57 * Mandatory byte array extra field in {@link #ACTION_AID_SELECTED}. 58 * 59 * <p>Contains the AID selected. 60 * @hide 61 */ 62 public static final String EXTRA_AID = "com.android.nfc_extras.extra.AID"; 63 64 /** 65 * Broadcast action: A filtered APDU was received. 66 * 67 * <p>This happens when an APDU of interest was matched by the Nfc adapter, 68 * for instance as the result of matching an externally-configured filter. 69 * 70 * <p>The filter configuration mechanism is not currently defined. 71 * 72 * <p>Always contains the extra field {@link EXTRA_APDU_BYTES}. 73 * 74 * @hide 75 */ 76 public static final String ACTION_APDU_RECEIVED = 77 "com.android.nfc_extras.action.APDU_RECEIVED"; 78 79 /** 80 * Mandatory byte array extra field in {@link #ACTION_APDU_RECEIVED}. 81 * 82 * <p>Contains the bytes of the received APDU. 83 * 84 * @hide 85 */ 86 public static final String EXTRA_APDU_BYTES = 87 "com.android.nfc_extras.extra.APDU_BYTES"; 88 89 /** 90 * Broadcast action: An EMV card removal event was detected. 91 * 92 * @hide 93 */ 94 public static final String ACTION_EMV_CARD_REMOVAL = 95 "com.android.nfc_extras.action.EMV_CARD_REMOVAL"; 96 97 /** 98 * Broadcast action: An adapter implementing MIFARE Classic via card 99 * emulation detected that a block has been accessed. 100 * 101 * <p>This may only be issued for the first block that the reader 102 * authenticates to. 103 * 104 * <p>May contain the extra field {@link #EXTRA_MIFARE_BLOCK}. 105 * 106 * @hide 107 */ 108 public static final String ACTION_MIFARE_ACCESS_DETECTED = 109 "com.android.nfc_extras.action.MIFARE_ACCESS_DETECTED"; 110 111 /** 112 * Optional integer extra field in {@link #ACTION_MIFARE_ACCESS_DETECTED}. 113 * 114 * <p>Provides the block number being accessed. If not set, the block 115 * number being accessed is unknown. 116 * 117 * @hide 118 */ 119 public static final String EXTRA_MIFARE_BLOCK = 120 "com.android.nfc_extras.extra.MIFARE_BLOCK"; 121 122 NfcExecutionEnvironment(NfcAdapterExtras extras) { 123 mExtras = extras; 124 mToken = new Binder(); 125 } 126 127 /** 128 * Open the NFC Execution Environment on its contact interface. 129 * 130 * <p>Opening a channel to the the secure element may fail 131 * for a number of reasons: 132 * <ul> 133 * <li>NFC must be enabled for the connection to the SE to be opened. 134 * If it is disabled at the time of this call, an {@link EeNfcDisabledException} 135 * is thrown. 136 * 137 * <li>Only one process may open the secure element at a time. Additionally, 138 * this method is not reentrant. If the secure element is already opened, 139 * either by this process or by a different process, an {@link EeAlreadyOpenException} 140 * is thrown. 141 * 142 * <li>If the connection to the secure element could not be initialized, 143 * an {@link EeInitializationException} is thrown. 144 * 145 * <li>If the secure element or the NFC controller is activated in listen 146 * mode - that is, it is talking over the contactless interface - an 147 * {@link EeListenModeException} is thrown. 148 * 149 * <li>If the NFC controller is in a field powered by a remote device, 150 * such as a payment terminal, an {@link EeExternalFieldException} is 151 * thrown. 152 * </ul> 153 * <p>All other NFC functionality is disabled while the NFC-EE is open 154 * on its contact interface, so make sure to call {@link #close} once complete. 155 * 156 * <p class="note"> 157 * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission. 158 * 159 * @throws EeAlreadyOpenException if the NFC-EE is already open 160 * @throws EeNfcDisabledException if NFC is disabled 161 * @throws EeInitializationException if the Secure Element could not be initialized 162 * @throws EeListenModeException if the NFCC or Secure Element is activated in listen mode 163 * @throws EeExternalFieldException if the NFCC is in the presence of a remote-powered field 164 * @throws EeIoException if an unknown error occurs 165 */ 166 public void open() throws EeIOException { 167 try { 168 Bundle b = mExtras.getService().open(mExtras.mPackageName, mToken); 169 throwBundle(b); 170 } catch (RemoteException e) { 171 mExtras.attemptDeadServiceRecovery(e); 172 throw new EeIOException("NFC Service was dead, try again"); 173 } 174 } 175 176 /** 177 * Close the NFC Execution Environment on its contact interface. 178 * 179 * <p class="note"> 180 * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission. 181 * 182 * @throws IOException if the NFC-EE is already open, or some other error occurs 183 */ 184 public void close() throws IOException { 185 try { 186 throwBundle(mExtras.getService().close(mExtras.mPackageName, mToken)); 187 } catch (RemoteException e) { 188 mExtras.attemptDeadServiceRecovery(e); 189 throw new IOException("NFC Service was dead"); 190 } 191 } 192 193 /** 194 * Send raw commands to the NFC-EE and receive the response. 195 * 196 * <p class="note"> 197 * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission. 198 * 199 * @throws IOException if the NFC-EE is not open, or some other error occurs 200 */ 201 public byte[] transceive(byte[] in) throws IOException { 202 Bundle b; 203 try { 204 b = mExtras.getService().transceive(mExtras.mPackageName, in); 205 } catch (RemoteException e) { 206 mExtras.attemptDeadServiceRecovery(e); 207 throw new IOException("NFC Service was dead, need to re-open"); 208 } 209 throwBundle(b); 210 return b.getByteArray("out"); 211 } 212 213 private static void throwBundle(Bundle b) throws EeIOException { 214 switch (b.getInt("e")) { 215 case EE_ERROR_NFC_DISABLED: 216 throw new EeNfcDisabledException(b.getString("m")); 217 case EE_ERROR_IO: 218 throw new EeIOException(b.getString("m")); 219 case EE_ERROR_INIT: 220 throw new EeInitializationException(b.getString("m")); 221 case EE_ERROR_EXT_FIELD: 222 throw new EeExternalFieldException(b.getString("m")); 223 case EE_ERROR_LISTEN_MODE: 224 throw new EeListenModeException(b.getString("m")); 225 case EE_ERROR_ALREADY_OPEN: 226 throw new EeAlreadyOpenException(b.getString("m")); 227 } 228 } 229 } 230
