/*
* Copyright 2011-2013 the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package de.schildbach.wallet.digitalcoin.util;
import java.nio.charset.Charset;
import java.util.Arrays;
import android.annotation.TargetApi;
import android.app.Activity;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.NfcManager;
import android.os.Build;
/**
* @author Andreas Schildbach
*/
@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)
public class NfcTools
{
private static final Charset UTF_8 = Charset.forName("UTF-8");
private static final Charset US_ASCII = Charset.forName("US-ASCII");
private static final byte[] RTD_ANDROID_APP = "android.com:pkg".getBytes(US_ASCII);
public static boolean publishUri(final Object nfcManager, final Activity activity, final String uri)
{
final NfcAdapter adapter = ((NfcManager) nfcManager).getDefaultAdapter();
if (adapter == null)
return false;
final NdefRecord uriRecord = wellKnownUriRecord(uri);
adapter.enableForegroundNdefPush(activity, ndefMessage(uriRecord, true, activity.getPackageName()));
return true;
}
public static boolean publishMimeObject(final Object nfcManager, final Activity activity, final String mimeType, final byte[] payload,
final boolean includeApplicationRecord)
{
final NfcAdapter adapter = ((NfcManager) nfcManager).getDefaultAdapter();
if (adapter == null)
return false;
final NdefRecord mimeRecord = mimeRecord(mimeType, payload);
adapter.enableForegroundNdefPush(activity, ndefMessage(mimeRecord, includeApplicationRecord, activity.getPackageName()));
return true;
}
public static void unpublish(final Object nfcManager, final Activity activity)
{
final NfcAdapter adapter = ((NfcManager) nfcManager).getDefaultAdapter();
if (adapter == null)
return;
adapter.disableForegroundNdefPush(activity);
}
private static NdefMessage ndefMessage(final NdefRecord record, final boolean includeApplicationRecord, final String packageName)
{
if (includeApplicationRecord)
{
final NdefRecord appRecord = androidApplicationRecord(packageName);
return new NdefMessage(new NdefRecord[] { record, appRecord });
}
else
{
return new NdefMessage(new NdefRecord[] { record });
}
}
private static NdefRecord absoluteUriRecord(final String uri)
{
return new NdefRecord(NdefRecord.TNF_ABSOLUTE_URI, NdefRecord.RTD_URI, new byte[0], uri.getBytes(UTF_8));
}
private static NdefRecord wellKnownUriRecord(final String uri)
{
final byte[] uriBytes = uri.getBytes(UTF_8);
final byte[] recordBytes = new byte[uriBytes.length + 1];
recordBytes[0] = (byte) 0x0; // prefix, alway 0 for digitalcoin scheme
System.arraycopy(uriBytes, 0, recordBytes, 1, uriBytes.length);
return new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_URI, new byte[0], recordBytes);
}
private static NdefRecord mimeRecord(final String mimeType, final byte[] payload)
{
final byte[] mimeBytes = mimeType.getBytes(US_ASCII);
final NdefRecord mimeRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, mimeBytes, new byte[0], payload);
return mimeRecord;
}
private static NdefRecord androidApplicationRecord(final String packageName)
{
return new NdefRecord(NdefRecord.TNF_EXTERNAL_TYPE, RTD_ANDROID_APP, new byte[0], packageName.getBytes(US_ASCII));
}
public static byte[] extractMimePayload(final String mimeType, final Object message)
{
byte[] mimeBytes = mimeType.getBytes(US_ASCII);
final NdefMessage ndefMessage = (NdefMessage) message;
for (final NdefRecord record : ndefMessage.getRecords())
{
if (record.getTnf() == NdefRecord.TNF_MIME_MEDIA && Arrays.equals(record.getType(), mimeBytes))
return record.getPayload();
}
return null;
}
}