Java tutorial
/** * Copyright (C) 2016 Open Whisper Systems * * 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 org.thoughtcrime.securesms; import android.content.ActivityNotFoundException; import android.content.Context; import android.content.Intent; import android.content.res.Configuration; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.PorterDuff; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ColorDrawable; import android.os.Build; import android.os.Bundle; import android.os.Vibrator; import android.support.annotation.DrawableRes; import android.support.annotation.NonNull; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTransaction; import android.text.Html; import android.text.TextUtils; import android.text.method.LinkMovementMethod; import android.util.Log; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.AnticipateInterpolator; import android.view.animation.OvershootInterpolator; import android.view.animation.ScaleAnimation; import android.widget.AdapterView; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import org.thoughtcrime.securesms.color.MaterialColor; import org.thoughtcrime.securesms.components.camera.CameraView; import org.thoughtcrime.securesms.crypto.IdentityKeyParcelable; import org.thoughtcrime.securesms.crypto.IdentityKeyUtil; import org.thoughtcrime.securesms.crypto.MasterSecret; import org.thoughtcrime.securesms.qr.QrCode; import org.thoughtcrime.securesms.qr.ScanListener; import org.thoughtcrime.securesms.qr.ScanningThread; import org.thoughtcrime.securesms.recipients.Recipient; import org.thoughtcrime.securesms.recipients.RecipientFactory; import org.thoughtcrime.securesms.recipients.Recipients; import org.thoughtcrime.securesms.util.DynamicLanguage; import org.thoughtcrime.securesms.util.DynamicTheme; import org.thoughtcrime.securesms.util.TextSecurePreferences; import org.thoughtcrime.securesms.util.Util; import org.thoughtcrime.securesms.util.ViewUtil; import org.whispersystems.libsignal.IdentityKey; import org.whispersystems.libsignal.fingerprint.Fingerprint; import org.whispersystems.libsignal.fingerprint.FingerprintParsingException; import org.whispersystems.libsignal.fingerprint.FingerprintVersionMismatchException; import org.whispersystems.libsignal.fingerprint.NumericFingerprintGenerator; import org.whispersystems.signalservice.api.util.InvalidNumberException; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; /** * Activity for verifying identity keys. * * @author Moxie Marlinspike */ public class VerifyIdentityActivity extends PassphraseRequiredActionBarActivity implements Recipient.RecipientModifiedListener, ScanListener, View.OnClickListener { private static final String TAG = VerifyIdentityActivity.class.getSimpleName(); public static final String RECIPIENT_ID = "recipient_id"; public static final String RECIPIENT_IDENTITY = "recipient_identity"; private final DynamicTheme dynamicTheme = new DynamicTheme(); private final DynamicLanguage dynamicLanguage = new DynamicLanguage(); private VerifyDisplayFragment displayFragment = new VerifyDisplayFragment(); private VerifyScanFragment scanFragment = new VerifyScanFragment(); @Override public void onPreCreate() { dynamicTheme.onCreate(this); dynamicLanguage.onCreate(this); } @Override protected void onCreate(Bundle state, @NonNull MasterSecret masterSecret) { try { getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setTitle(R.string.AndroidManifest__verify_safety_number); Recipient recipient = RecipientFactory.getRecipientForId(this, getIntent().getLongExtra(RECIPIENT_ID, -1), true); recipient.addListener(this); setActionBarNotificationBarColor(recipient.getColor()); Bundle extras = new Bundle(); extras.putParcelable(VerifyDisplayFragment.REMOTE_IDENTITY, getIntent().getParcelableExtra(RECIPIENT_IDENTITY)); extras.putString(VerifyDisplayFragment.REMOTE_NUMBER, Util.canonicalizeNumber(this, recipient.getNumber())); extras.putParcelable(VerifyDisplayFragment.LOCAL_IDENTITY, new IdentityKeyParcelable(IdentityKeyUtil.getIdentityKey(this))); extras.putString(VerifyDisplayFragment.LOCAL_NUMBER, TextSecurePreferences.getLocalNumber(this)); scanFragment.setScanListener(this); displayFragment.setClickListener(this); initFragment(android.R.id.content, displayFragment, masterSecret, dynamicLanguage.getCurrentLocale(), extras); } catch (InvalidNumberException e) { Log.w(TAG, e); finish(); } } @Override public boolean onPrepareOptionsMenu(Menu menu) { super.onPrepareOptionsMenu(menu); menu.clear(); MenuInflater inflater = this.getMenuInflater(); inflater.inflate(R.menu.verify_identity, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.verify_identity__share: handleShare(); return true; case android.R.id.home: finish(); return true; } return false; } @Override public void onModified(final Recipient recipient) { Util.runOnMain(new Runnable() { @Override public void run() { setActionBarNotificationBarColor(recipient.getColor()); } }); } @Override public void onQrDataFound(final String data) { Util.runOnMain(new Runnable() { @Override public void run() { ((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).vibrate(50); getSupportFragmentManager().popBackStack(); displayFragment.setScannedFingerprint(data); } }); } @Override public void onClick(View v) { FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); transaction.setCustomAnimations(R.anim.slide_from_top, R.anim.slide_to_bottom, R.anim.slide_from_bottom, R.anim.slide_to_top); transaction.replace(android.R.id.content, scanFragment).addToBackStack(null).commit(); } private void setActionBarNotificationBarColor(MaterialColor color) { getSupportActionBar().setBackgroundDrawable(new ColorDrawable(color.toActionBarColor(this))); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { getWindow().setStatusBarColor(color.toStatusBarColor(this)); } } private void handleShare() { String shareString = getString(R.string.VerifyIdentityActivity_our_signal_safety_number) + "\n" + displayFragment.getFormattedSafetyNumbers() + "\n"; Intent intent = new Intent(); intent.setAction(Intent.ACTION_SEND); intent.putExtra(Intent.EXTRA_TEXT, shareString); intent.setType("text/plain"); try { startActivity(Intent.createChooser(intent, getString(R.string.VerifyIdentityActivity_share_safety_number_via))); } catch (ActivityNotFoundException e) { Toast.makeText(VerifyIdentityActivity.this, R.string.VerifyIdentityActivity_no_app_to_share_to, Toast.LENGTH_LONG).show(); } } public static class VerifyDisplayFragment extends Fragment implements Recipients.RecipientsModifiedListener { public static final String REMOTE_NUMBER = "remote_number"; public static final String REMOTE_IDENTITY = "remote_identity"; public static final String LOCAL_IDENTITY = "local_identity"; public static final String LOCAL_NUMBER = "local_number"; private Recipients recipient; private String localNumber; private String remoteNumber; private IdentityKey localIdentity; private IdentityKey remoteIdentity; private Fingerprint fingerprint; private View container; private View numbersContainer; private ImageView qrCode; private ImageView qrVerified; private TextView description; private View.OnClickListener clickListener; private TextView[] codes = new TextView[12]; private boolean animateSuccessOnDraw = false; private boolean animateFailureOnDraw = false; @Override public View onCreateView(LayoutInflater inflater, ViewGroup viewGroup, Bundle bundle) { this.container = ViewUtil.inflate(inflater, viewGroup, R.layout.verify_display_fragment); this.numbersContainer = ViewUtil.findById(container, R.id.number_table); this.qrCode = ViewUtil.findById(container, R.id.qr_code); this.qrVerified = ViewUtil.findById(container, R.id.qr_verified); this.description = ViewUtil.findById(container, R.id.description); this.codes[0] = ViewUtil.findById(container, R.id.code_first); this.codes[1] = ViewUtil.findById(container, R.id.code_second); this.codes[2] = ViewUtil.findById(container, R.id.code_third); this.codes[3] = ViewUtil.findById(container, R.id.code_fourth); this.codes[4] = ViewUtil.findById(container, R.id.code_fifth); this.codes[5] = ViewUtil.findById(container, R.id.code_sixth); this.codes[6] = ViewUtil.findById(container, R.id.code_seventh); this.codes[7] = ViewUtil.findById(container, R.id.code_eighth); this.codes[8] = ViewUtil.findById(container, R.id.code_ninth); this.codes[9] = ViewUtil.findById(container, R.id.code_tenth); this.codes[10] = ViewUtil.findById(container, R.id.code_eleventh); this.codes[11] = ViewUtil.findById(container, R.id.code_twelth); this.qrCode.setOnClickListener(clickListener); this.registerForContextMenu(numbersContainer); return container; } @Override public void onCreate(Bundle bundle) { super.onCreate(bundle); this.localNumber = getArguments().getString(LOCAL_NUMBER); this.localIdentity = ((IdentityKeyParcelable) getArguments().getParcelable(LOCAL_IDENTITY)).get(); this.remoteNumber = getArguments().getString(REMOTE_NUMBER); this.recipient = RecipientFactory.getRecipientsFromString(getActivity(), this.remoteNumber, true); this.remoteIdentity = ((IdentityKeyParcelable) getArguments().getParcelable(REMOTE_IDENTITY)).get(); this.fingerprint = new NumericFingerprintGenerator(5200).createFor(localNumber, localIdentity, remoteNumber, remoteIdentity); this.recipient.addListener(this); } @Override public void onModified(Recipients recipients) { Util.runOnMain(new Runnable() { @Override public void run() { setFingerprintViews(fingerprint); } }); } @Override public void onResume() { super.onResume(); setFingerprintViews(fingerprint); if (animateSuccessOnDraw) { animateSuccessOnDraw = false; animateVerifiedSuccess(); } else if (animateFailureOnDraw) { animateFailureOnDraw = false; animateVerifiedFailure(); ; } } @Override public void onDestroy() { super.onDestroy(); recipient.removeListener(this); } @Override public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, view, menuInfo); MenuInflater inflater = getActivity().getMenuInflater(); inflater.inflate(R.menu.verify_display_fragment_context_menu, menu); } @Override public boolean onContextItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_copy: handleCopyToClipboard(); return true; case R.id.menu_compare: handleCompareWithClipboard(); return true; default: return super.onContextItemSelected(item); } } public void setScannedFingerprint(String scanned) { try { if (fingerprint.getScannableFingerprint().compareTo(scanned.getBytes("ISO-8859-1"))) { this.animateSuccessOnDraw = true; } else { this.animateFailureOnDraw = true; } } catch (FingerprintVersionMismatchException e) { Log.w(TAG, e); if (e.getOurVersion() < e.getTheirVersion()) { Toast.makeText(getActivity(), R.string.VerifyIdentityActivity_your_contact_is_running_a_newer_version_of_Signal, Toast.LENGTH_LONG).show(); } else { Toast.makeText(getActivity(), R.string.VerifyIdentityActivity_your_contact_is_running_an_old_version_of_signal, Toast.LENGTH_LONG).show(); } } catch (FingerprintParsingException e) { Log.w(TAG, e); Toast.makeText(getActivity(), R.string.VerifyIdentityActivity_the_scanned_qr_code_is_not_a_correctly_formatted_safety_number, Toast.LENGTH_LONG).show(); } catch (UnsupportedEncodingException e) { throw new AssertionError(e); } } public void setClickListener(View.OnClickListener listener) { this.clickListener = listener; } public String getFormattedSafetyNumbers() { StringBuilder result = new StringBuilder(); for (int i = 0; i < codes.length; i++) { result.append(codes[i].getText()); if (i != codes.length - 1) { if (((i + 1) % 4) == 0) result.append('\n'); else result.append(' '); } } return result.toString(); } private void handleCopyToClipboard() { Util.writeTextToClipboard(getActivity(), getFormattedSafetyNumbers()); } private void handleCompareWithClipboard() { String clipboardData = Util.readTextFromClipboard(getActivity()); if (clipboardData == null) { Toast.makeText(getActivity(), R.string.VerifyIdentityActivity_no_safety_number_to_compare_was_found_in_the_clipboard, Toast.LENGTH_LONG).show(); return; } String numericClipboardData = clipboardData.replaceAll("\\D", ""); if (TextUtils.isEmpty(numericClipboardData) || numericClipboardData.length() != 60) { Toast.makeText(getActivity(), R.string.VerifyIdentityActivity_no_safety_number_to_compare_was_found_in_the_clipboard, Toast.LENGTH_LONG).show(); return; } if (fingerprint.getDisplayableFingerprint().getDisplayText().equals(numericClipboardData)) { animateVerifiedSuccess(); } else { animateVerifiedFailure(); } } private void setFingerprintViews(Fingerprint fingerprint) { String digits = fingerprint.getDisplayableFingerprint().getDisplayText(); int partSize = digits.length() / codes.length; for (int i = 0; i < codes.length; i++) { codes[i].setText(digits.substring(i * partSize, (i * partSize) + partSize)); } byte[] qrCodeData = fingerprint.getScannableFingerprint().getSerialized(); String qrCodeString = new String(qrCodeData, Charset.forName("ISO-8859-1")); Bitmap qrCodeBitmap = QrCode.create(qrCodeString); qrCode.setImageBitmap(qrCodeBitmap); description.setText(Html.fromHtml(String.format(getActivity().getString( R.string.verify_display_fragment__if_you_wish_to_verify_the_security_of_your_end_to_end_encryption_with_s), recipient.toShortString()))); description.setMovementMethod(LinkMovementMethod.getInstance()); } private Bitmap createVerifiedBitmap(int width, int height, @DrawableRes int id) { Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); Bitmap check = BitmapFactory.decodeResource(getResources(), id); float offset = (width - check.getWidth()) / 2; canvas.drawBitmap(check, offset, offset, null); return bitmap; } private void animateVerifiedSuccess() { Bitmap qrBitmap = ((BitmapDrawable) qrCode.getDrawable()).getBitmap(); Bitmap qrSuccess = createVerifiedBitmap(qrBitmap.getWidth(), qrBitmap.getHeight(), R.drawable.ic_check_white_48dp); qrVerified.setImageBitmap(qrSuccess); qrVerified.getBackground().setColorFilter(getResources().getColor(R.color.green_500), PorterDuff.Mode.MULTIPLY); animateVerified(); } private void animateVerifiedFailure() { Bitmap qrBitmap = ((BitmapDrawable) qrCode.getDrawable()).getBitmap(); Bitmap qrSuccess = createVerifiedBitmap(qrBitmap.getWidth(), qrBitmap.getHeight(), R.drawable.ic_close_white_48dp); qrVerified.setImageBitmap(qrSuccess); qrVerified.getBackground().setColorFilter(getResources().getColor(R.color.red_500), PorterDuff.Mode.MULTIPLY); animateVerified(); } private void animateVerified() { ScaleAnimation scaleAnimation = new ScaleAnimation(0, 1, 0, 1, ScaleAnimation.RELATIVE_TO_SELF, 0.5f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f); scaleAnimation.setInterpolator(new OvershootInterpolator()); scaleAnimation.setDuration(800); scaleAnimation.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { qrVerified.postDelayed(new Runnable() { @Override public void run() { ScaleAnimation scaleAnimation = new ScaleAnimation(1, 0, 1, 0, ScaleAnimation.RELATIVE_TO_SELF, 0.5f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f); scaleAnimation.setInterpolator(new AnticipateInterpolator()); scaleAnimation.setDuration(500); ViewUtil.animateOut(qrVerified, scaleAnimation, View.GONE); } }, 2000); } @Override public void onAnimationRepeat(Animation animation) { } }); ViewUtil.animateIn(qrVerified, scaleAnimation); } } public static class VerifyScanFragment extends Fragment { private View container; private CameraView cameraView; private ScanningThread scanningThread; private ScanListener scanListener; public View onCreateView(LayoutInflater inflater, ViewGroup viewGroup, Bundle bundle) { this.container = ViewUtil.inflate(inflater, viewGroup, R.layout.verify_scan_fragment); this.cameraView = ViewUtil.findById(container, R.id.scanner); return container; } @Override public void onResume() { super.onResume(); this.scanningThread = new ScanningThread(); this.scanningThread.setScanListener(scanListener); this.scanningThread.setCharacterSet("ISO-8859-1"); this.cameraView.onResume(); this.cameraView.setPreviewCallback(scanningThread); this.scanningThread.start(); } @Override public void onPause() { super.onPause(); this.cameraView.onPause(); this.scanningThread.stopScanning(); } @Override public void onConfigurationChanged(Configuration newConfiguration) { super.onConfigurationChanged(newConfiguration); this.cameraView.onPause(); this.cameraView.onResume(); this.cameraView.setPreviewCallback(scanningThread); } public void setScanListener(ScanListener listener) { if (this.scanningThread != null) scanningThread.setScanListener(listener); this.scanListener = listener; } } }