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/*
* Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
* 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 org.sufficientlysecure.keychain.ui;
import org.sufficientlysecure.htmltextview.HtmlTextView;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.helper.ActionBarHelper;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import android.annotation.TargetApi;
import android.content.Intent;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.NfcAdapter.CreateNdefMessageCallback;
import android.nfc.NfcAdapter.OnNdefPushCompleteCallback;
import android.nfc.NfcEvent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.provider.Settings;
import android.widget.Toast;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public class ShareNfcBeamActivity extends SherlockFragmentActivity implements
CreateNdefMessageCallback, OnNdefPushCompleteCallback {
public static final String ACTION_SHARE_KEYRING_WITH_NFC = Constants.INTENT_PREFIX
+ "SHARE_KEYRING_WITH_NFC";
public static final String EXTRA_MASTER_KEY_ID = "master_key_id";
NfcAdapter mNfcAdapter;
byte[] mSharedKeyringBytes;
private static final int MESSAGE_SENT = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
Toast.makeText(this,
getString(R.string.error) + ": " + getString(R.string.error_jellyBeanNeeded),
Toast.LENGTH_LONG).show();
finish();
} else {
// Check for available NFC Adapter
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (mNfcAdapter == null) {
Toast.makeText(this,
getString(R.string.error) + ": " + getString(R.string.error_nfcNeeded),
Toast.LENGTH_LONG).show();
finish();
} else {
// handle actions after verifying that nfc works...
handleActions(getIntent());
}
}
}
protected void handleActions(Intent intent) {
String action = intent.getAction();
Bundle extras = intent.getExtras();
if (extras == null) {
extras = new Bundle();
}
if (ACTION_SHARE_KEYRING_WITH_NFC.equals(action)) {
long masterKeyId = extras.getLong(EXTRA_MASTER_KEY_ID);
// get public keyring as byte array
mSharedKeyringBytes = ProviderHelper.getPublicKeyRingsAsByteArray(this,
new long[] { masterKeyId });
// Register callback to set NDEF message
mNfcAdapter.setNdefPushMessageCallback(this, this);
// Register callback to listen for message-sent success
mNfcAdapter.setOnNdefPushCompleteCallback(this, this);
}
}
/**
* Parses the NDEF Message from the intent and prints to the TextView
*/
void handleActionNdefDiscovered(Intent intent) {
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
// only one message sent during the beam
NdefMessage msg = (NdefMessage) rawMsgs[0];
// record 0 contains the MIME type, record 1 is the AAR, if present
byte[] receivedKeyringBytes = msg.getRecords()[0].getPayload();
Intent importIntent = new Intent(this, ImportKeysActivity.class);
importIntent.setAction(ImportKeysActivity.ACTION_IMPORT_KEY);
importIntent.putExtra(ImportKeysActivity.EXTRA_KEY_BYTES, receivedKeyringBytes);
finish();
startActivity(importIntent);
}
private void buildView() {
setContentView(R.layout.share_nfc_beam);
HtmlTextView aboutTextView = (HtmlTextView) findViewById(R.id.nfc_beam_text);
// load html from raw resource (Parsing handled by HtmlTextView library)
aboutTextView.setHtmlFromRawResource(this, R.raw.nfc_beam_share);
// no flickering when clicking textview for Android < 4
aboutTextView.setTextColor(getResources().getColor(android.R.color.black));
// set actionbar without home button if called from another app
ActionBarHelper.setBackButton(this);
}
/**
* Implementation for the CreateNdefMessageCallback interface
*/
@Override
public NdefMessage createNdefMessage(NfcEvent event) {
/**
* When a device receives a push with an AAR in it, the application specified in the AAR is
* guaranteed to run. The AAR overrides the tag dispatch system. You can add it back in to
* guarantee that this activity starts when receiving a beamed message. For now, this code
* uses the tag dispatch system.
*/
NdefMessage msg = new NdefMessage(NdefRecord.createMime(Constants.NFC_MIME,
mSharedKeyringBytes), NdefRecord.createApplicationRecord(Constants.PACKAGE_NAME));
return msg;
}
/**
* Implementation for the OnNdefPushCompleteCallback interface
*/
@Override
public void onNdefPushComplete(NfcEvent arg0) {
// A handler is needed to send messages to the activity when this
// callback occurs, because it happens from a binder thread
mHandler.obtainMessage(MESSAGE_SENT).sendToTarget();
}
/** This handler receives a message from onNdefPushComplete */
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_SENT:
Toast.makeText(getApplicationContext(), R.string.nfcSuccessfull, Toast.LENGTH_LONG)
.show();
break;
}
}
};
@Override
public void onResume() {
super.onResume();
// Check to see that the Activity started due to an Android Beam
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
handleActionNdefDiscovered(getIntent());
} else {
// build view only when sending nfc, not when receiving, as it gets directly into Import
// activity on receiving
buildView();
}
}
@Override
public void onNewIntent(Intent intent) {
// onResume gets called after this to handle the intent
setIntent(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getSupportMenuInflater();
inflater.inflate(R.menu.nfc_beam, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// app icon in Action Bar clicked; go to KeyListPublicActivity
Intent intent = new Intent(this, KeyListPublicActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
case R.id.menu_settings:
Intent intentSettings = new Intent(Settings.ACTION_NFCSHARING_SETTINGS);
startActivity(intentSettings);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
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