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/*
* Copyright (C) 2011 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.nfc_extras;
import java.io.IOException;
import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.content.Context;
import android.nfc.INfcAdapterExtras;
import android.nfc.NfcAdapter;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
public class NfcExecutionEnvironment {
private final NfcAdapterExtras mExtras;
/**
* Broadcast Action: An ISO-DEP AID was selected.
*
* <p>This happens as the result of a 'SELECT AID' command from an
* external NFC reader/writer.
*
* <p>Always contains the extra field {@link #EXTRA_AID}
*
* <p class="note">
* Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission
* to receive.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_AID_SELECTED =
"com.android.nfc_extras.action.AID_SELECTED";
/**
* Mandatory byte array extra field in {@link #ACTION_AID_SELECTED}.
*
* <p>Contains the AID selected.
* @hide
*/
public static final String EXTRA_AID = "com.android.nfc_extras.extra.AID";
NfcExecutionEnvironment(NfcAdapterExtras extras) {
mExtras = extras;
}
/**
* Open the NFC Execution Environment on its contact interface.
*
* <p>Only one process may open the secure element at a time. If it is
* already open, an {@link IOException} is thrown.
*
* <p>All other NFC functionality is disabled while the NFC-EE is open
* on its contact interface, so make sure to call {@link #close} once complete.
*
* <p class="note">
* Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission.
*
* @throws IOException if the NFC-EE is already open, or some other error occurs
*/
public void open() throws IOException {
try {
Bundle b = mExtras.getService().open(new Binder());
throwBundle(b);
} catch (RemoteException e) {
mExtras.attemptDeadServiceRecovery(e);
throw new IOException("NFC Service was dead, try again");
}
}
/**
* Close the NFC Execution Environment on its contact interface.
*
* <p class="note">
* Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission.
*
* @throws IOException if the NFC-EE is already open, or some other error occurs
*/
public void close() throws IOException {
try {
throwBundle(mExtras.getService().close());
} catch (RemoteException e) {
mExtras.attemptDeadServiceRecovery(e);
throw new IOException("NFC Service was dead");
}
}
/**
* Send raw commands to the NFC-EE and receive the response.
*
* <p class="note">
* Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission.
*
* @throws IOException if the NFC-EE is not open, or some other error occurs
*/
public byte[] transceive(byte[] in) throws IOException {
Bundle b;
try {
b = mExtras.getService().transceive(in);
} catch (RemoteException e) {
mExtras.attemptDeadServiceRecovery(e);
throw new IOException("NFC Service was dead, need to re-open");
}
throwBundle(b);
return b.getByteArray("out");
}
private static void throwBundle(Bundle b) throws IOException {
if (b.getInt("e") == -1) {
throw new IOException(b.getString("m"));
}
}
}
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