122 lines
4.1 KiB
Java
122 lines
4.1 KiB
Java
/*
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* Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
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* Copyright (C) 2010-2014 Thialfihar <thi@thialfihar.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.pgp;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import android.support.annotation.NonNull;
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import android.text.TextUtils;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.util.Log;
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public class PgpHelper {
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public static final Pattern PGP_MESSAGE = Pattern.compile(
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".*?(-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----).*", Pattern.DOTALL);
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public static final Pattern PGP_CLEARTEXT_SIGNATURE = Pattern
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.compile(".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----" +
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"BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
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Pattern.DOTALL);
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public static final Pattern PGP_PUBLIC_KEY = Pattern.compile(
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".*?(-----BEGIN PGP PUBLIC KEY BLOCK-----.*?-----END PGP PUBLIC KEY BLOCK-----).*",
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Pattern.DOTALL);
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/**
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* Fixing broken PGP MESSAGE Strings coming from GMail/AOSP Mail
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*/
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public static String fixPgpMessage(String message) {
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// windows newline -> unix newline
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message = message.replaceAll("\r\n", "\n");
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// Mac OS before X newline -> unix newline
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message = message.replaceAll("\r", "\n");
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// remove whitespaces before newline
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message = message.replaceAll(" +\n", "\n");
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// only two consecutive newlines are allowed
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message = message.replaceAll("\n\n+", "\n\n");
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// replace non breakable spaces
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message = message.replaceAll("\\xa0", " ");
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return message;
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}
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/**
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* Fixing broken PGP SIGNED MESSAGE Strings coming from GMail/AOSP Mail
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*/
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public static String fixPgpCleartextSignature(CharSequence input) {
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if (!TextUtils.isEmpty(input)) {
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String text = input.toString();
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// windows newline -> unix newline
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text = text.replaceAll("\r\n", "\n");
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// Mac OS before X newline -> unix newline
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text = text.replaceAll("\r", "\n");
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return text;
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} else {
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return null;
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}
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}
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public static String getPgpMessageContent(@NonNull CharSequence input) {
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Log.dEscaped(Constants.TAG, "input: " + input);
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Matcher matcher = PgpHelper.PGP_MESSAGE.matcher(input);
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if (matcher.matches()) {
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String text = matcher.group(1);
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text = fixPgpMessage(text);
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Log.dEscaped(Constants.TAG, "input fixed: " + text);
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return text;
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} else {
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matcher = PgpHelper.PGP_CLEARTEXT_SIGNATURE.matcher(input);
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if (matcher.matches()) {
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String text = matcher.group(1);
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text = fixPgpCleartextSignature(text);
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Log.dEscaped(Constants.TAG, "input fixed: " + text);
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return text;
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} else {
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return null;
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}
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}
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}
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public static String getPgpKeyContent(@NonNull CharSequence input) {
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Log.dEscaped(Constants.TAG, "input: " + input);
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Matcher matcher = PgpHelper.PGP_PUBLIC_KEY.matcher(input);
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if (matcher.matches()) {
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String text = matcher.group(1);
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text = fixPgpMessage(text);
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Log.dEscaped(Constants.TAG, "input fixed: " + text);
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return text;
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}
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return null;
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}
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}
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