/*
* Copyright (C) 2012-2015 Dominik Schürmann <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();
}
}