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https://code.briarproject.org/briar/briar.git
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Implement BQP Android UI using QR codes
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str4d
@@ -0,0 +1,384 @@
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package org.briarproject.android.keyagreement;
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import android.bluetooth.BluetoothAdapter;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.hardware.Camera;
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import android.os.AsyncTask;
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import android.os.Bundle;
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import android.support.annotation.Nullable;
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import android.util.Base64;
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import android.view.Display;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.animation.AlphaAnimation;
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import android.widget.ImageView;
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import android.widget.LinearLayout;
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import android.widget.TextView;
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import android.widget.Toast;
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import com.google.zxing.Result;
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import org.briarproject.R;
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import org.briarproject.android.AndroidComponent;
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import org.briarproject.android.fragment.BaseEventFragment;
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import org.briarproject.android.util.AndroidUtils;
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import org.briarproject.android.util.CameraView;
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import org.briarproject.android.util.QrCodeUtils;
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import org.briarproject.android.util.QrCodeDecoder;
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import org.briarproject.api.event.Event;
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import org.briarproject.api.event.KeyAgreementAbortedEvent;
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import org.briarproject.api.event.KeyAgreementFailedEvent;
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import org.briarproject.api.event.KeyAgreementFinishedEvent;
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import org.briarproject.api.event.KeyAgreementListeningEvent;
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import org.briarproject.api.event.KeyAgreementStartedEvent;
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import org.briarproject.api.event.KeyAgreementWaitingEvent;
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import org.briarproject.api.keyagreement.KeyAgreementTask;
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import org.briarproject.api.keyagreement.KeyAgreementTaskFactory;
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import org.briarproject.api.keyagreement.Payload;
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import org.briarproject.api.keyagreement.PayloadEncoder;
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import org.briarproject.api.keyagreement.PayloadParser;
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import java.io.IOException;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.logging.Logger;
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import javax.inject.Inject;
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import static android.bluetooth.BluetoothAdapter.ACTION_STATE_CHANGED;
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import static android.bluetooth.BluetoothAdapter.EXTRA_STATE;
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import static android.bluetooth.BluetoothAdapter.STATE_ON;
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import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_NOSENSOR;
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import static android.widget.LinearLayout.HORIZONTAL;
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import static android.widget.LinearLayout.VERTICAL;
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import static android.widget.Toast.LENGTH_LONG;
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import static java.util.logging.Level.WARNING;
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public class ShowQrCodeFragment extends BaseEventFragment
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implements QrCodeDecoder.ResultCallback {
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private static final Logger LOG =
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Logger.getLogger(ShowQrCodeFragment.class.getName());
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public static final String TAG = "ShowQrCodeFragment";
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@Inject
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protected KeyAgreementTaskFactory keyAgreementTaskFactory;
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@Inject
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protected PayloadEncoder payloadEncoder;
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@Inject
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protected PayloadParser payloadParser;
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private LinearLayout qrLayout;
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private CameraView cameraView;
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private TextView status;
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private ImageView qrCode;
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private volatile KeyAgreementTask task;
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private volatile boolean toggleBluetooth;
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private volatile BluetoothAdapter adapter;
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private BluetoothStateReceiver receiver;
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private AtomicBoolean waitingForBluetooth = new AtomicBoolean();
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private QrCodeDecoder decoder;
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private boolean gotRemotePayload;
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public static ShowQrCodeFragment newInstance() {
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Bundle args = new Bundle();
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ShowQrCodeFragment fragment = new ShowQrCodeFragment();
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fragment.setArguments(args);
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return fragment;
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}
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@Override
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public String getUniqueTag() {
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return TAG;
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}
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@Override
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public void injectActivity(AndroidComponent component) {
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component.inject(this);
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}
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@Nullable
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container,
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Bundle savedInstanceState) {
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return inflater.inflate(R.layout.fragment_keyagreement_qr, container,
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false);
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}
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@Override
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public void onViewCreated(View view, Bundle savedInstanceState) {
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super.onViewCreated(view, savedInstanceState);
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qrLayout = (LinearLayout) view.findViewById(R.id.qr_layout);
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cameraView = (CameraView) view.findViewById(R.id.camera_view);
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status = (TextView) view.findViewById(R.id.connect_status);
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qrCode = (ImageView) view.findViewById(R.id.qr_code);
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}
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@Override
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public void onActivityCreated(Bundle savedInstanceState) {
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super.onActivityCreated(savedInstanceState);
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getActivity().setRequestedOrientation(SCREEN_ORIENTATION_NOSENSOR);
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decoder = new QrCodeDecoder(this);
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Display display = getActivity().getWindowManager().getDefaultDisplay();
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boolean portrait = display.getWidth() < display.getHeight();
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qrLayout.setOrientation(portrait ? VERTICAL : HORIZONTAL);
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// Only enable BT adapter if it is not already on.
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adapter = BluetoothAdapter.getDefaultAdapter();
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if (adapter != null)
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toggleBluetooth = !adapter.isEnabled();
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}
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@Override
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public void onStart() {
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super.onStart();
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// Listen for changes to the Bluetooth state
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IntentFilter filter = new IntentFilter();
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filter.addAction(ACTION_STATE_CHANGED);
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receiver = new BluetoothStateReceiver();
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getActivity().registerReceiver(receiver, filter);
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if (adapter != null && toggleBluetooth) {
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waitingForBluetooth.set(true);
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toggleBluetooth(true);
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} else
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startListening();
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}
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@Override
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public void onResume() {
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super.onResume();
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if (!gotRemotePayload) openCamera();
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}
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@Override
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public void onPause() {
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super.onPause();
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if (!gotRemotePayload) releaseCamera();
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}
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@Override
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public void onStop() {
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super.onStop();
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stopListening();
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if (receiver != null) getActivity().unregisterReceiver(receiver);
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}
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private void startListening() {
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task = keyAgreementTaskFactory.getTask();
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gotRemotePayload = false;
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new Thread(new Runnable() {
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@Override
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public void run() {
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task.listen();
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}
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}).start();
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}
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private void stopListening() {
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new Thread(new Runnable() {
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@Override
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public void run() {
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task.stopListening();
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if (toggleBluetooth) toggleBluetooth(false);
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}
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}).start();
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}
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private void toggleBluetooth(boolean enable) {
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if (adapter != null) {
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AndroidUtils.enableBluetooth(adapter, enable);
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}
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}
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private void openCamera() {
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AsyncTask<Void, Void, Camera> openTask =
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new AsyncTask<Void, Void, Camera>() {
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@Override
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protected Camera doInBackground(Void... unused) {
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LOG.info("Opening camera");
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try {
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return Camera.open();
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} catch (RuntimeException e) {
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LOG.log(WARNING,
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"Error opening camera, trying again", e);
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try {
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Thread.sleep(1000);
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} catch (InterruptedException e2) {
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LOG.info("Interrupted before second attempt");
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return null;
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}
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try {
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return Camera.open();
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} catch (RuntimeException e2) {
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LOG.log(WARNING, "Error opening camera", e2);
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return null;
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}
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}
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}
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@Override
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protected void onPostExecute(Camera camera) {
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if (camera == null) {
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// TODO better solution?
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getActivity().finish();
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} else {
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cameraView.start(camera, decoder, 0);
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}
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}
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};
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openTask.execute();
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}
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private void releaseCamera() {
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LOG.info("Releasing camera");
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try {
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cameraView.stop();
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} catch (RuntimeException e) {
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LOG.log(WARNING, "Error releasing camera", e);
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// TODO better solution
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getActivity().finish();
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}
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}
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private void reset() {
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cameraView.setVisibility(View.VISIBLE);
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startListening();
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openCamera();
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}
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private void qrCodeScanned(String content) {
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try {
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// TODO use Base32
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Payload remotePayload = payloadParser.parse(
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Base64.decode(content, 0));
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cameraView.setVisibility(View.GONE);
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status.setText(R.string.connecting_to_device);
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task.connectAndRunProtocol(remotePayload);
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} catch (IOException e) {
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// TODO show failure
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Toast.makeText(getActivity(), R.string.qr_code_invalid,
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LENGTH_LONG).show();
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}
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}
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@Override
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public void eventOccurred(Event e) {
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if (e instanceof KeyAgreementListeningEvent) {
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KeyAgreementListeningEvent event = (KeyAgreementListeningEvent) e;
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setQrCode(event.getLocalPayload());
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} else if (e instanceof KeyAgreementFailedEvent) {
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keyAgreementFailed();
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} else if (e instanceof KeyAgreementWaitingEvent) {
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keyAgreementWaiting();
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} else if (e instanceof KeyAgreementStartedEvent) {
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keyAgreementStarted();
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} else if (e instanceof KeyAgreementAbortedEvent) {
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KeyAgreementAbortedEvent event = (KeyAgreementAbortedEvent) e;
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keyAgreementAborted(event.didRemoteAbort());
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} else if (e instanceof KeyAgreementFinishedEvent) {
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// We want to reuse the connection, so don't disable Bluetooth
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toggleBluetooth = false;
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}
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}
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private void setQrCode(final Payload localPayload) {
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listener.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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// TODO use Base32
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String input = Base64.encodeToString(
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payloadEncoder.encode(localPayload), 0);
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qrCode.setImageBitmap(
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QrCodeUtils.createQrCode(getActivity(), input));
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// Simple fade-in animation
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AlphaAnimation anim = new AlphaAnimation(0.0f, 1.0f);
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anim.setDuration(200);
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qrCode.startAnimation(anim);
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}
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});
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}
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private void keyAgreementFailed() {
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listener.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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reset();
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// TODO show failure somewhere persistent?
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Toast.makeText(getActivity(), R.string.connection_failed,
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LENGTH_LONG).show();
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}
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});
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}
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private void keyAgreementWaiting() {
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listener.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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status.setText(R.string.waiting_for_contact);
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}
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});
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}
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private void keyAgreementStarted() {
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listener.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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listener.showLoadingScreen(false,
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R.string.authenticating_with_device);
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}
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});
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}
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private void keyAgreementAborted(final boolean remoteAborted) {
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listener.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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reset();
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listener.hideLoadingScreen();
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// TODO show abort somewhere persistent?
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Toast.makeText(getActivity(),
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remoteAborted ? R.string.connection_aborted_remote :
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R.string.connection_aborted_local, LENGTH_LONG)
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.show();
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}
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});
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}
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@Override
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public void handleResult(final Result result) {
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listener.runOnUiThread(new Runnable() {
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public void run() {
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LOG.info("Got result from decoder");
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if (!gotRemotePayload) {
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gotRemotePayload = true;
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releaseCamera();
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qrCodeScanned(result.getText());
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}
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}
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});
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}
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private class BluetoothStateReceiver extends BroadcastReceiver {
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@Override
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public void onReceive(Context ctx, Intent intent) {
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int state = intent.getIntExtra(EXTRA_STATE, 0);
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if (state == STATE_ON && waitingForBluetooth.get()) {
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LOG.info("Bluetooth enabled");
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waitingForBluetooth.set(false);
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startListening();
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}
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}
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}
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}
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