/* Copyright 2013 MultiMC Contributors
 *
 * Authors: Orochimarufan <orochimarufan.x3@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *	 http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "stubkeyring.h"

#include <QStringList>

// Scrambling
// this is NOT SAFE, but it's not plain either.
int scrambler = 0x9586309;

QString scramble(QString in_)
{
	QByteArray in = in_.toUtf8();
	QByteArray out;
	for (int i = 0; i < in.length(); i++)
		out.append(in.at(i) ^ scrambler);
	return QString::fromUtf8(out);
}

inline QString base64(QString in)
{
	return QString(in.toUtf8().toBase64());
}
inline QString unbase64(QString in)
{
	return QString::fromUtf8(QByteArray::fromBase64(in.toLatin1()));
}

inline QString scramble64(QString in)
{
	return base64(scramble(in));
}
inline QString unscramble64(QString in)
{
	return scramble(unbase64(in));
}

// StubKeyring implementation
inline QString generateKey(QString service, QString username)
{
	return QString("%1/%2").arg(base64(service)).arg(scramble64(username));
}

bool StubKeyring::storePassword(QString service, QString username, QString password)
{
	m_settings.setValue(generateKey(service, username), scramble64(password));
	return true;
}

QString StubKeyring::getPassword(QString service, QString username)
{
	QString key = generateKey(service, username);
	if (!m_settings.contains(key))
		return QString();
	return unscramble64(m_settings.value(key).toString());
}

bool StubKeyring::hasPassword(QString service, QString username)
{
	return m_settings.contains(generateKey(service, username));
}

QStringList StubKeyring::getStoredAccounts(QString service)
{
	service = base64(service).append('/');
	QStringList out;
	QStringList in(m_settings.allKeys());
	QStringListIterator it(in);
	while (it.hasNext())
	{
		QString c = it.next();
		if (c.startsWith(service))
			out << unscramble64(c.mid(service.length()));
	}
	return out;
}

void StubKeyring::removeStoredAccount(QString service, QString username)
{
	QString key = generateKey(service, username);
	m_settings.remove(key);
}

// FIXME: this needs tweaking/changes for user account level storage
StubKeyring::StubKeyring()
	:
	  //	m_settings(QSettings::UserScope, "Orochimarufan", "Keyring")
	  m_settings("keyring.cfg", QSettings::IniFormat)
{
}