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// SPDX-FileCopyrightText: 2021 Carl Schwan <carlschwan@kde.org>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
#include "e2ee/e2ee.h"
#include "e2ee/qolmerrors.h"
#include "olm/olm.h"
#include <memory>
#include <variant>
namespace Quotient {
//! An in-bound group session is responsible for decrypting incoming
//! communication in a Megolm session.
class QUOTIENT_API QOlmInboundGroupSession
{
public:
~QOlmInboundGroupSession();
//! Creates a new instance of `OlmInboundGroupSession`.
static std::unique_ptr<QOlmInboundGroupSession> create(const QByteArray& key);
//! Import an inbound group session, from a previous export.
static std::unique_ptr<QOlmInboundGroupSession> import(const QByteArray& key);
//! Serialises an `OlmInboundGroupSession` to encrypted Base64.
QByteArray pickle(const PicklingMode &mode) const;
//! Deserialises from encrypted Base64 that was previously obtained by pickling
//! an `OlmInboundGroupSession`.
static std::variant<std::unique_ptr<QOlmInboundGroupSession>, QOlmError>
unpickle(const QByteArray& picked, const PicklingMode& mode);
//! Decrypts ciphertext received for this group session.
std::variant<std::pair<QString, uint32_t>, QOlmError> decrypt(
const QByteArray& 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, QOlmError> 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.
QByteArray sessionId() const;
bool isVerified() const;
QOlmInboundGroupSession(OlmInboundGroupSession* session);
private:
OlmInboundGroupSession* m_groupSession;
};
using QOlmInboundGroupSessionPtr = std::unique_ptr<QOlmInboundGroupSession>;
} // namespace Quotient
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