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// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <boost/optional.hpp>
#include <memory>
#include <mtx/events.hpp>
#include <mtx/events/encrypted.hpp>
#include <mtxclient/crypto/client.hpp>
#include <CacheCryptoStructs.h>
constexpr auto OLM_ALGO = "m.olm.v1.curve25519-aes-sha2";
namespace olm {
enum class DecryptionErrorCode
{
MissingSession, // Session was not found, retrieve from backup or request from other devices
// and try again
MissingSessionIndex, // Session was found, but it does not reach back enough to this index,
// retrieve from backup or request from other devices and try again
DbError, // DB read failed
DecryptionFailed, // libolm error
ParsingFailed, // Failed to parse the actual event
ReplayAttack, // Megolm index reused
UnknownFingerprint, // Unknown device Fingerprint
};
struct DecryptionResult
{
std::optional<DecryptionErrorCode> error;
std::optional<std::string> error_message;
std::optional<mtx::events::collections::TimelineEvents> event;
};
struct OlmMessage
{
std::string sender_key;
std::string sender;
using RecipientKey = std::string;
std::map<RecipientKey, mtx::events::msg::OlmCipherContent> ciphertext;
};
void
from_json(const nlohmann::json &obj, OlmMessage &msg);
mtx::crypto::OlmClient *
client();
void
handle_to_device_messages(const std::vector<mtx::events::collections::DeviceEvents> &msgs);
nlohmann::json
try_olm_decryption(const std::string &sender_key,
const mtx::events::msg::OlmCipherContent &content);
void
handle_olm_message(const OlmMessage &msg);
//! Establish a new inbound megolm session with the decrypted payload from olm.
void
create_inbound_megolm_session(const mtx::events::DeviceEvent<mtx::events::msg::RoomKey> &roomKey,
const std::string &sender_key);
void
import_inbound_megolm_session(
const mtx::events::DeviceEvent<mtx::events::msg::ForwardedRoomKey> &roomKey);
nlohmann::json
handle_pre_key_olm_message(const std::string &sender,
const std::string &sender_key,
const mtx::events::msg::OlmCipherContent &content);
mtx::events::msg::Encrypted
encrypt_group_message(const std::string &room_id,
const std::string &device_id,
nlohmann::json body);
DecryptionResult
decryptEvent(const MegolmSessionIndex &index,
const mtx::events::EncryptedEvent<mtx::events::msg::Encrypted> &event);
void
mark_keys_as_published();
//! Request the encryption keys from sender's device for the given event.
void
send_key_request_for(mtx::events::EncryptedEvent<mtx::events::msg::Encrypted> e,
const std::string &request_id,
bool cancel = false);
void
handle_key_request_message(const mtx::events::DeviceEvent<mtx::events::msg::KeyRequest> &);
void
send_megolm_key_to_device(const std::string &user_id,
const std::string &device_id,
const mtx::events::msg::ForwardedRoomKey &payload);
//! Send encrypted to device messages, targets is a map from userid to device ids or {} for all
//! devices
void
send_encrypted_to_device_messages(const std::map<std::string, std::vector<std::string>> targets,
const mtx::events::collections::DeviceEvents &event,
bool force_new_session = false);
//! Request backup and signing keys and cache them locally
void
request_cross_signing_keys();
//! Download backup and signing keys and cache them locally
void
download_cross_signing_keys();
} // namespace olm
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