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// SPDX-FileCopyrightText: 2021 Alexey Andreyev <aa13q@ya.ru>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
#include <QDebug>
#include <olm/olm.h> // FIXME: OlmSession
#include "e2ee/e2ee.h"
#include "e2ee/qolmmessage.h"
#include "e2ee/qolmerrors.h"
#include "e2ee/qolmaccount.h"
namespace Quotient {
class QOlmAccount;
class QOlmSession;
//! Either an outbound or inbound session for secure communication.
class QUOTIENT_API QOlmSession
{
public:
~QOlmSession();
//! Creates an inbound session for sending/receiving messages from a received 'prekey' message.
static std::variant<std::unique_ptr<QOlmSession>, QOlmError>
createInboundSession(QOlmAccount* account, const QOlmMessage& preKeyMessage);
static std::variant<std::unique_ptr<QOlmSession>, QOlmError>
createInboundSessionFrom(QOlmAccount* account,
const QString& theirIdentityKey,
const QOlmMessage& preKeyMessage);
static std::variant<std::unique_ptr<QOlmSession>, QOlmError>
createOutboundSession(QOlmAccount* account, const QString& theirIdentityKey,
const QString& theirOneTimeKey);
//! Serialises an `QOlmSession` to encrypted Base64.
std::variant<QByteArray, QOlmError> pickle(const PicklingMode &mode);
//! Deserialises from encrypted Base64 that was previously obtained by pickling a `QOlmSession`.
static std::variant<std::unique_ptr<QOlmSession>, QOlmError> unpickle(
const QByteArray& pickled, const PicklingMode& mode);
//! Encrypts a plaintext message using the session.
QOlmMessage encrypt(const QString &plaintext);
//! Decrypts a message using this session. Decoding is lossy, meaing if
//! the decrypted plaintext contains invalid UTF-8 symbols, they will
//! be returned as `U+FFFD` (�).
std::variant<QString, QOlmError> decrypt(const QOlmMessage &message) const;
//! Get a base64-encoded identifier for this session.
QByteArray sessionId() const;
//! The type of the next message that will be returned from encryption.
QOlmMessage::Type encryptMessageType();
//! Checker for any received messages for this session.
bool hasReceivedMessage() const;
//! Checks if the 'prekey' message is for this in-bound session.
std::variant<bool, QOlmError> matchesInboundSession(
const QOlmMessage& preKeyMessage) const;
//! Checks if the 'prekey' message is for this in-bound session.
std::variant<bool, QOlmError> matchesInboundSessionFrom(
const QString& theirIdentityKey, const QOlmMessage& preKeyMessage) const;
friend bool operator<(const QOlmSession& lhs, const QOlmSession& rhs)
{
return lhs.sessionId() < rhs.sessionId();
}
friend bool operator<(const std::unique_ptr<QOlmSession>& lhs,
const std::unique_ptr<QOlmSession>& rhs)
{
return *lhs < *rhs;
}
OlmSession* raw() const { return m_session; }
QOlmSession(OlmSession* session);
private:
//! Helper function for creating new sessions and handling errors.
static OlmSession* create();
static std::variant<std::unique_ptr<QOlmSession>, QOlmError> createInbound(
QOlmAccount* account, const QOlmMessage& preKeyMessage,
bool from = false, const QString& theirIdentityKey = "");
OlmSession* m_session;
};
} //namespace Quotient
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