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// SPDX-FileCopyrightText: 2021 Carl Schwan <carlschwan@kde.org>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
#include <QByteArray>
#include <variant>
#include "olm/olm.h"
#include "olm/errors.h"
#include "olm/e2ee.h"
namespace Quotient {
//! An in-bound group session is responsible for decrypting incoming
//! communication in a Megolm session.
struct QOlmInboundGroupSession
{
public:
//! Creates a new instance of `OlmInboundGroupSession`.
static std::variant<QOlmInboundGroupSession, OlmError> create(const QString &key);
//! Import an inbound group session, from a previous export.
static std::variant<QOlmInboundGroupSession, OlmError> import(const QString &key);
//! Serialises an `OlmInboundGroupSession` to encrypted Base64.
std::variant<QByteArray, OlmError> pickle(const PicklingMode &mode) const;
//! Deserialises from encrypted Base64 that was previously obtained by pickling
//! an `OlmInboundGroupSession`.
static std::variant<QOlmInboundGroupSession, OlmError> unpicke(QByteArray &picked, const PicklingMode &mode);
//! Decrypts ciphertext received for this group session.
std::variant<std::pair<QString, uint32_t>, OlmError> decrypt(QString &message);
//! Export the base64-encoded ratchet key for this session, at the given index,
//! in a format which can be used by import.
std::variant<QByteArray, OlmError> exportSession(uint32_t messageIndex);
//! Get the first message index we know how to decrypt.
uint32_t firstKnownIndex() const;
//! Get a base64-encoded identifier for this session.
std::variant<QByteArray, OlmError> sessionId() const;
bool isVerified() const;
private:
QOlmInboundGroupSession(OlmInboundGroupSession *session, const QByteArray &buffer);
OlmInboundGroupSession *m_groupSession;
QByteArray m_buffer;
};
} // namespace Quotient
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