Java tutorial
/* * Copyright (C) 2012-2015 Dominik Schrmann <dominik@dominikschuermann.de> * Copyright (C) 2010-2014 Thialfihar <thi@thialfihar.org> * * 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.sufficientlysecure.keychain.ui; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.text.TextUtils; import android.view.View; import android.widget.Toast; import org.sufficientlysecure.keychain.Constants; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.compatibility.ClipboardReflection; import org.sufficientlysecure.keychain.intents.OpenKeychainIntents; import org.sufficientlysecure.keychain.operations.results.OperationResult; import org.sufficientlysecure.keychain.operations.results.SingletonResult; import org.sufficientlysecure.keychain.pgp.PgpHelper; import org.sufficientlysecure.keychain.ui.base.BaseActivity; import org.sufficientlysecure.keychain.util.Log; import java.util.regex.Matcher; public class DecryptTextActivity extends BaseActivity { /* Intents */ public static final String ACTION_DECRYPT_TEXT = OpenKeychainIntents.DECRYPT_TEXT; public static final String EXTRA_TEXT = OpenKeychainIntents.DECRYPT_EXTRA_TEXT; // intern public static final String ACTION_DECRYPT_FROM_CLIPBOARD = Constants.INTENT_PREFIX + "DECRYPT_TEXT_FROM_CLIPBOARD"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setFullScreenDialogClose(new View.OnClickListener() { @Override public void onClick(View v) { setResult(Activity.RESULT_CANCELED); finish(); } }, false); // Handle intent actions handleActions(savedInstanceState, getIntent()); } @Override protected void initLayout() { setContentView(R.layout.decrypt_text_activity); } /** * Fixing broken PGP MESSAGE Strings coming from GMail/AOSP Mail */ private String fixPgpMessage(String message) { // windows newline -> unix newline message = message.replaceAll("\r\n", "\n"); // Mac OS before X newline -> unix newline message = message.replaceAll("\r", "\n"); // remove whitespaces before newline message = message.replaceAll(" +\n", "\n"); // only two consecutive newlines are allowed message = message.replaceAll("\n\n+", "\n\n"); // replace non breakable spaces message = message.replaceAll("\\xa0", " "); return message; } /** * Fixing broken PGP SIGNED MESSAGE Strings coming from GMail/AOSP Mail */ private String fixPgpCleartextSignature(CharSequence input) { if (!TextUtils.isEmpty(input)) { String text = input.toString(); // windows newline -> unix newline text = text.replaceAll("\r\n", "\n"); // Mac OS before X newline -> unix newline text = text.replaceAll("\r", "\n"); return text; } else { return null; } } private String getPgpContent(CharSequence input) { // only decrypt if clipboard content is available and a pgp message or cleartext signature if (!TextUtils.isEmpty(input)) { Log.dEscaped(Constants.TAG, "input: " + input); Matcher matcher = PgpHelper.PGP_MESSAGE.matcher(input); if (matcher.matches()) { String text = matcher.group(1); text = fixPgpMessage(text); Log.dEscaped(Constants.TAG, "input fixed: " + text); return text; } else { matcher = PgpHelper.PGP_CLEARTEXT_SIGNATURE.matcher(input); if (matcher.matches()) { String text = matcher.group(1); text = fixPgpCleartextSignature(text); Log.dEscaped(Constants.TAG, "input fixed: " + text); return text; } else { return null; } } } else { return null; } } /** * Handles all actions with this intent */ private void handleActions(Bundle savedInstanceState, Intent intent) { String action = intent.getAction(); Bundle extras = intent.getExtras(); String type = intent.getType(); if (extras == null) { extras = new Bundle(); } if (savedInstanceState != null) { return; } if (Intent.ACTION_SEND.equals(action) && type != null) { Log.d(Constants.TAG, "ACTION_SEND"); Log.logDebugBundle(extras, "SEND extras"); // When sending to Keychain Decrypt via share menu if ("text/plain".equals(type)) { String sharedText = extras.getString(Intent.EXTRA_TEXT); sharedText = getPgpContent(sharedText); if (sharedText != null) { loadFragment(sharedText); } else { Log.e(Constants.TAG, "EXTRA_TEXT does not contain PGP content!"); Toast.makeText(this, R.string.error_invalid_data, Toast.LENGTH_LONG).show(); finish(); } } else { Log.e(Constants.TAG, "ACTION_SEND received non-plaintext, this should not happen in this activity!"); Toast.makeText(this, R.string.error_invalid_data, Toast.LENGTH_LONG).show(); finish(); } } else if (ACTION_DECRYPT_TEXT.equals(action)) { Log.d(Constants.TAG, "ACTION_DECRYPT_TEXT"); String extraText = extras.getString(EXTRA_TEXT); extraText = getPgpContent(extraText); if (extraText != null) { loadFragment(extraText); } else { Log.e(Constants.TAG, "EXTRA_TEXT does not contain PGP content!"); Toast.makeText(this, R.string.error_invalid_data, Toast.LENGTH_LONG).show(); finish(); } } else if (ACTION_DECRYPT_FROM_CLIPBOARD.equals(action)) { Log.d(Constants.TAG, "ACTION_DECRYPT_FROM_CLIPBOARD"); CharSequence clipboardText = ClipboardReflection.getClipboardText(this); String text = getPgpContent(clipboardText); if (text != null) { loadFragment(text); } else { returnInvalidResult(); } } else if (ACTION_DECRYPT_TEXT.equals(action)) { Log.e(Constants.TAG, "Include the extra 'text' in your Intent!"); Toast.makeText(this, R.string.error_invalid_data, Toast.LENGTH_LONG).show(); finish(); } } private void returnInvalidResult() { SingletonResult result = new SingletonResult(SingletonResult.RESULT_ERROR, OperationResult.LogType.MSG_NO_VALID_ENC); Intent intent = new Intent(); intent.putExtra(SingletonResult.EXTRA_RESULT, result); setResult(RESULT_OK, intent); finish(); } private void loadFragment(String ciphertext) { // Create an instance of the fragment Fragment frag = DecryptTextFragment.newInstance(ciphertext); // Add the fragment to the 'fragment_container' FrameLayout // NOTE: We use commitAllowingStateLoss() to prevent weird crashes! getSupportFragmentManager().beginTransaction().replace(R.id.decrypt_text_fragment_container, frag) .commitAllowingStateLoss(); // do it immediately! getSupportFragmentManager().executePendingTransactions(); } }