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tdlib-fork/td/telegram/SecretChatsManager.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/telegram/SecretChatsManager.h"
#include "td/telegram/ConfigShared.h"
#include "td/telegram/ContactsManager.h"
#include "td/telegram/DhCache.h"
#include "td/telegram/Global.h"
#include "td/telegram/logevent/SecretChatEvent.h"
#include "td/telegram/MessageId.h"
#include "td/telegram/MessagesManager.h"
#include "td/telegram/net/NetQueryDispatcher.h"
#include "td/telegram/SequenceDispatcher.h"
#include "td/telegram/StateManager.h"
#include "td/telegram/Td.h"
#include "td/telegram/TdDb.h"
#include "td/telegram/secret_api.h"
#include "td/telegram/telegram_api.hpp"
#include "td/mtproto/DhHandshake.h"
#include "td/actor/PromiseFuture.h"
#include "td/db/binlog/BinlogEvent.h"
#include "td/db/binlog/BinlogInterface.h"
#include "td/utils/common.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Random.h"
#include "td/utils/Status.h"
#include "td/utils/Time.h"
#include <memory>
namespace td {
// qts and seq_no
// Each EncryptedMessage (update_message) has qts.
// Such updates must be handled in order of qts
//
// Qts should be handled on level of SecretChatsManager
// 1. Each update can be received by SecretChatsManager multiple times.
// 2. Each update should be sent to SecretChatActor only once. (Though SecretChatActor mustn't rely it)
// 3. Updates must be send in order of qts, without gaps.
// 4. SecretChatActor must notify SecretChatManager when update is processed (saved in database)
// 5. Only after all updates <= qts are processed by SecretChatActor, UpdatesManager should be
// notified about new qts.
//
// seq_no
// 1.
// x_in = 0 if we initiated secret chat.
// x_in = 1 if other client initiated secret chat
// x_out = 1 - x_in
// 2. Send:
// in_seq_no = my_in_seq_no * 2 + x_in
// out_seq_no = my_out_seq_no * 2 + x_out
// my_out_seq_no++;
//
// 3. Receive
// fail_if (in_seq_no % 2 != (1 - x_in)), in_seq_no /= 2.
// fail_if (out_seq_no % 2 != x_out), out_seq_no /= 2.
// drop_if (out_seq_no < my_in_seq_no)
// handle_gap_if(out_seq_no > my_in_seq_no)
// my_in_seq_no++;
//
// fail_if(in_seq_no < his_in_seq_no)
// his_in_seq_no = in_seq_no
// fail_if(my_out_seq_no < his_in_seq_no)
//
// 4. Preventing gaps.
// All messages must be sent in order of out_seq_no
// Messages of older layer have imaginary seq_no = -1
// a. TODO use invokeAfter.
// b. Just don't send next message before server accepted previous one.
//
// 5. Handling gaps.
// TODO
// Just fail chat.
SecretChatsManager::SecretChatsManager(ActorShared<> parent) : parent_(std::move(parent)) {
}
void SecretChatsManager::start_up() {
if (!G()->parameters().use_secret_chats) {
dummy_mode_ = true;
return;
}
// TODO: use database wrapper
auto pmc = G()->td_db()->get_binlog_pmc();
auto qts_str = pmc->get("updates.qts");
if (!qts_str.empty()) {
init_qts(to_integer<int32>(qts_str));
}
class StateCallback : public StateManager::Callback {
public:
explicit StateCallback(ActorId<SecretChatsManager> parent) : parent_(std::move(parent)) {
}
bool on_online(bool online_flag) override {
send_closure(parent_, &SecretChatsManager::on_online, online_flag);
return parent_.is_alive();
}
private:
ActorId<SecretChatsManager> parent_;
};
send_closure(G()->state_manager(), &StateManager::add_callback, make_unique<StateCallback>(actor_id(this)));
}
void SecretChatsManager::init_qts(int qts) {
if (dummy_mode_ || close_flag_) {
return;
}
has_qts_ = true;
qts_manager_.init(qts);
LOG(INFO) << "Init secret chats qts " << tag("qts", qts);
}
void SecretChatsManager::update_qts(int qts) {
if (dummy_mode_ || close_flag_ || qts < 0) {
return;
}
LOG(INFO) << "Update qts to " << qts;
add_qts(qts).set_value(Unit());
has_qts_ = true;
LOG(INFO) << "Update secret chats qts " << tag("qts", qts);
}
void SecretChatsManager::create_chat(int32 user_id, int64 user_access_hash, Promise<SecretChatId> promise) {
int32 random_id;
ActorId<SecretChatActor> actor;
do {
random_id = Random::secure_int32() & 0x7fffffff;
actor = create_chat_actor(random_id);
} while (actor.empty());
send_closure(actor, &SecretChatActor::create_chat, user_id, user_access_hash, random_id, std::move(promise));
}
void SecretChatsManager::cancel_chat(SecretChatId secret_chat_id, Promise<> promise) {
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Unit());
send_closure(actor, &SecretChatActor::cancel_chat, std::move(safe_promise));
}
void SecretChatsManager::send_message(SecretChatId secret_chat_id, tl_object_ptr<secret_api::decryptedMessage> message,
tl_object_ptr<telegram_api::InputEncryptedFile> file, Promise<> promise) {
// message->message_ = Random::fast(0, 1) ? string(1, static_cast<char>(0x80)) : "a";
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Status::Error(400, "Can't find secret chat"));
send_closure(actor, &SecretChatActor::send_message, std::move(message), std::move(file), std::move(safe_promise));
}
void SecretChatsManager::send_message_action(SecretChatId secret_chat_id,
tl_object_ptr<secret_api::SendMessageAction> action) {
auto actor = get_chat_actor(secret_chat_id.get());
if (actor.empty()) {
return;
}
send_closure(actor, &SecretChatActor::send_message_action, std::move(action));
}
void SecretChatsManager::send_read_history(SecretChatId secret_chat_id, int32 date, Promise<> promise) {
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Status::Error(400, "Can't find secret chat"));
send_closure(actor, &SecretChatActor::send_read_history, date, std::move(safe_promise));
}
void SecretChatsManager::send_open_message(SecretChatId secret_chat_id, int64 random_id, Promise<> promise) {
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Status::Error(400, "Can't find secret chat"));
send_closure(actor, &SecretChatActor::send_open_message, random_id, std::move(safe_promise));
}
void SecretChatsManager::delete_messages(SecretChatId secret_chat_id, vector<int64> random_ids, Promise<> promise) {
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Unit());
send_closure(actor, &SecretChatActor::delete_messages, std::move(random_ids), std::move(safe_promise));
}
void SecretChatsManager::delete_all_messages(SecretChatId secret_chat_id, Promise<> promise) {
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Unit());
send_closure(actor, &SecretChatActor::delete_all_messages, std::move(safe_promise));
}
void SecretChatsManager::notify_screenshot_taken(SecretChatId secret_chat_id, Promise<> promise) {
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Status::Error(400, "Can't find secret chat"));
send_closure(actor, &SecretChatActor::notify_screenshot_taken, std::move(safe_promise));
}
void SecretChatsManager::send_set_ttl_message(SecretChatId secret_chat_id, int32 ttl, int64 random_id,
Promise<> promise) {
auto actor = get_chat_actor(secret_chat_id.get());
auto safe_promise = SafePromise<>(std::move(promise), Status::Error(400, "Can't find secret chat"));
send_closure(actor, &SecretChatActor::send_set_ttl_message, ttl, random_id, std::move(safe_promise));
}
void SecretChatsManager::before_get_difference(int32 qts) {
if (dummy_mode_ || close_flag_) {
return;
}
last_get_difference_qts_ = qts;
// We will receive all updates later than qts anyway.
}
void SecretChatsManager::after_get_difference() {
if (dummy_mode_ || close_flag_) {
return;
}
}
void SecretChatsManager::on_update_chat(tl_object_ptr<telegram_api::updateEncryption> update) {
if (dummy_mode_ || close_flag_) {
return;
}
bool chat_requested = update->chat_->get_id() == telegram_api::encryptedChatRequested::ID;
pending_chat_updates_.push_back({Timestamp::in(chat_requested ? 1 : 0), std::move(update)});
flush_pending_chat_updates();
}
void SecretChatsManager::do_update_chat(tl_object_ptr<telegram_api::updateEncryption> update) {
int32 id = 0;
downcast_call(*update->chat_, [&](auto &x) { id = x.id_; });
send_closure(
update->chat_->get_id() == telegram_api::encryptedChatDiscarded::ID ? get_chat_actor(id) : create_chat_actor(id),
&SecretChatActor::update_chat, std::move(update->chat_));
}
void SecretChatsManager::on_update_message(tl_object_ptr<telegram_api::updateNewEncryptedMessage> update,
bool force_apply) {
if (dummy_mode_ || close_flag_) {
return;
}
// UpdatesManager MUST postpone updates during GetDifference
auto qts = update->qts_;
if (!force_apply) {
if (!has_qts_) {
LOG(INFO) << "Got update, don't know current qts. Force get_difference";
force_get_difference();
return;
}
if (qts <= last_get_difference_qts_) {
LOG(WARNING) << "Got updates with " << tag("qts", qts) << " lower or equal than "
<< tag("last get difference qts", last_get_difference_qts_);
force_get_difference();
return;
}
auto mem_qts = qts_manager_.mem_pts();
if (qts <= mem_qts) {
LOG(WARNING) << "Duplicated update " << tag("qts", qts) << tag("mem_qts", mem_qts);
return;
}
if (qts != mem_qts + 1) {
LOG(WARNING) << "Got gap in qts " << mem_qts << " ... " << qts;
force_get_difference();
// TODO wait 1 second?
return;
}
}
auto event = make_unique<logevent::InboundSecretMessage>();
event->qts = qts;
downcast_call(*update->message_, [&](auto &x) {
event->chat_id = x.chat_id_;
event->date = x.date_;
event->encrypted_message = std::move(x.bytes_);
});
if (update->message_->get_id() == telegram_api::encryptedMessage::ID) {
auto message = move_tl_object_as<telegram_api::encryptedMessage>(update->message_);
if (message->file_->get_id() == telegram_api::encryptedFile::ID) {
auto file = move_tl_object_as<telegram_api::encryptedFile>(message->file_);
event->file.id = file->id_;
event->file.access_hash = file->access_hash_;
event->file.size = file->size_;
event->file.dc_id = file->dc_id_;
event->file.key_fingerprint = file->key_fingerprint_;
event->has_encrypted_file = true;
}
}
add_inbound_message(std::move(event));
}
Promise<> SecretChatsManager::add_qts(int32 qts) {
auto id = qts_manager_.add_pts(qts);
return PromiseCreator::event(self_closure(this, &SecretChatsManager::on_qts_ack, id));
}
void SecretChatsManager::replay_binlog_event(BinlogEvent &&binlog_event) {
auto r_message = logevent::SecretChatEvent::from_buffer_slice(binlog_event.data_as_buffer_slice());
LOG_IF(FATAL, r_message.is_error()) << "Failed to deserialize event: " << r_message.error();
auto message = r_message.move_as_ok();
message->set_logevent_id(binlog_event.id_);
LOG(INFO) << "Process binlog event " << *message;
switch (message->get_type()) {
case logevent::SecretChatEvent::Type::InboundSecretMessage:
return replay_inbound_message(
unique_ptr<logevent::InboundSecretMessage>(static_cast<logevent::InboundSecretMessage *>(message.release())));
case logevent::SecretChatEvent::Type::OutboundSecretMessage:
return replay_outbound_message(unique_ptr<logevent::OutboundSecretMessage>(
static_cast<logevent::OutboundSecretMessage *>(message.release())));
case logevent::SecretChatEvent::Type::CloseSecretChat:
return replay_close_chat(
unique_ptr<logevent::CloseSecretChat>(static_cast<logevent::CloseSecretChat *>(message.release())));
case logevent::SecretChatEvent::Type::CreateSecretChat:
return replay_create_chat(
unique_ptr<logevent::CreateSecretChat>(static_cast<logevent::CreateSecretChat *>(message.release())));
}
LOG(FATAL) << "Unknown logevent type " << tag("type", format::as_hex(static_cast<int32>(message->get_type())));
}
void SecretChatsManager::binlog_replay_finish() {
binlog_replay_finish_flag_ = true;
for (auto &it : id_to_actor_) {
send_closure(it.second, &SecretChatActor::binlog_replay_finish);
}
}
void SecretChatsManager::replay_inbound_message(unique_ptr<logevent::InboundSecretMessage> message) {
LOG(INFO) << "Replay inbound secret message in chat " << message->chat_id << " with qts " << message->qts;
auto actor = get_chat_actor(message->chat_id);
send_closure_later(actor, &SecretChatActor::replay_inbound_message, std::move(message));
}
void SecretChatsManager::add_inbound_message(unique_ptr<logevent::InboundSecretMessage> message) {
LOG(INFO) << "Process inbound secret message in chat " << message->chat_id << " with qts " << message->qts;
message->qts_ack = add_qts(message->qts);
auto actor = get_chat_actor(message->chat_id);
send_closure(actor, &SecretChatActor::add_inbound_message, std::move(message));
}
void SecretChatsManager::replay_close_chat(unique_ptr<logevent::CloseSecretChat> message) {
LOG(INFO) << "Replay close secret chat " << message->chat_id;
auto actor = get_chat_actor(message->chat_id);
send_closure_later(actor, &SecretChatActor::replay_close_chat, std::move(message));
}
void SecretChatsManager::replay_create_chat(unique_ptr<logevent::CreateSecretChat> message) {
LOG(INFO) << "Replay create secret chat " << message->random_id;
auto actor = create_chat_actor(message->random_id);
send_closure_later(actor, &SecretChatActor::replay_create_chat, std::move(message));
}
void SecretChatsManager::replay_outbound_message(unique_ptr<logevent::OutboundSecretMessage> message) {
LOG(INFO) << "Replay oubound secret message in chat " << message->chat_id;
auto actor = get_chat_actor(message->chat_id);
send_closure_later(actor, &SecretChatActor::replay_outbound_message, std::move(message));
}
void SecretChatsManager::force_get_difference() {
LOG(INFO) << "Force get difference";
send_closure(G()->td(), &Td::force_get_difference);
}
ActorId<SecretChatActor> SecretChatsManager::get_chat_actor(int32 id) {
return create_chat_actor_impl(id, false);
}
ActorId<SecretChatActor> SecretChatsManager::create_chat_actor(int32 id) {
return create_chat_actor_impl(id, true);
}
unique_ptr<SecretChatActor::Context> SecretChatsManager::make_secret_chat_context(int32 id) {
class Context : public SecretChatActor::Context {
public:
Context(int32 id, ActorShared<SecretChatsManager> parent, unique_ptr<SecretChatDb> secret_chat_db)
: secret_chat_id_(SecretChatId(id)), parent_(std::move(parent)), secret_chat_db_(std::move(secret_chat_db)) {
sequence_dispatcher_ = create_actor<SequenceDispatcher>("SecretChat SequenceDispatcher");
}
Context(const Context &other) = delete;
Context &operator=(const Context &other) = delete;
Context(Context &&other) = delete;
Context &operator=(Context &&other) = delete;
~Context() override {
send_closure(std::move(sequence_dispatcher_), &SequenceDispatcher::close_silent);
}
DhCallback *dh_callback() override {
return DhCache::instance();
}
NetQueryCreator &net_query_creator() override {
return G()->net_query_creator();
}
BinlogInterface *binlog() override {
return G()->td_db()->get_binlog();
}
SecretChatDb *secret_chat_db() override {
return secret_chat_db_.get();
}
std::shared_ptr<DhConfig> dh_config() override {
return G()->get_dh_config();
}
void set_dh_config(std::shared_ptr<DhConfig> dh_config) override {
G()->set_dh_config(std::move(dh_config));
}
void send_net_query(NetQueryPtr query, ActorShared<NetQueryCallback> callback, bool ordered) override {
if (ordered) {
send_closure(sequence_dispatcher_, &SequenceDispatcher::send_with_callback, std::move(query),
std::move(callback));
} else {
G()->net_query_dispatcher().dispatch_with_callback(std::move(query), std::move(callback));
}
}
bool get_config_option_boolean(const string &name) const override {
return G()->shared_config().get_option_boolean(name);
}
int32 unix_time() override {
return G()->unix_time();
}
bool close_flag() override {
return G()->close_flag();
}
void on_update_secret_chat(int64 access_hash, UserId user_id, SecretChatState state, bool is_outbound, int32 ttl,
int32 date, string key_hash, int32 layer) override {
send_closure(G()->contacts_manager(), &ContactsManager::on_update_secret_chat, secret_chat_id_, access_hash,
user_id, state, is_outbound, ttl, date, key_hash, layer);
}
void on_inbound_message(UserId user_id, MessageId message_id, int32 date,
tl_object_ptr<telegram_api::encryptedFile> file,
tl_object_ptr<secret_api::decryptedMessage> message, Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::on_get_secret_message, secret_chat_id_, user_id,
message_id, date, std::move(file), std::move(message), std::move(promise));
}
void on_send_message_error(int64 random_id, Status error, Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::on_send_secret_message_error, random_id, std::move(error),
std::move(promise));
}
void on_send_message_ack(int64 random_id) override {
send_closure(G()->messages_manager(), &MessagesManager::on_send_message_get_quick_ack, random_id);
}
void on_send_message_ok(int64 random_id, MessageId message_id, int32 date,
tl_object_ptr<telegram_api::EncryptedFile> file, Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::on_send_secret_message_success, random_id, message_id,
date, std::move(file), std::move(promise));
}
void on_delete_messages(std::vector<int64> random_ids, Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::delete_secret_messages, secret_chat_id_,
std::move(random_ids), std::move(promise));
}
void on_flush_history(MessageId message_id, Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::delete_secret_chat_history, secret_chat_id_, message_id,
std::move(promise));
}
void on_read_message(int64 random_id, Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::open_secret_message, secret_chat_id_, random_id,
std::move(promise));
}
void on_screenshot_taken(UserId user_id, MessageId message_id, int32 date, int64 random_id,
Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::on_secret_chat_screenshot_taken, secret_chat_id_, user_id,
message_id, date, random_id, std::move(promise));
}
void on_set_ttl(UserId user_id, MessageId message_id, int32 date, int32 ttl, int64 random_id,
Promise<> promise) override {
send_closure(G()->messages_manager(), &MessagesManager::on_secret_chat_ttl_changed, secret_chat_id_, user_id,
message_id, date, ttl, random_id, std::move(promise));
}
private:
SecretChatId secret_chat_id_;
ActorOwn<SequenceDispatcher> sequence_dispatcher_;
ActorShared<SecretChatsManager> parent_;
unique_ptr<SecretChatDb> secret_chat_db_;
};
return make_unique<Context>(id, actor_shared(this, id),
td::make_unique<SecretChatDb>(G()->td_db()->get_binlog_pmc_shared(), id));
}
ActorId<SecretChatActor> SecretChatsManager::create_chat_actor_impl(int32 id, bool can_be_empty) {
if (id == 0) {
return Auto();
}
auto it_flag = id_to_actor_.emplace(id, ActorOwn<SecretChatActor>());
if (it_flag.second) {
LOG(INFO) << "Create SecretChatActor: " << tag("id", id);
it_flag.first->second =
create_actor<SecretChatActor>(PSLICE() << "SecretChat " << id, id, make_secret_chat_context(id), can_be_empty);
if (binlog_replay_finish_flag_) {
send_closure(it_flag.first->second, &SecretChatActor::binlog_replay_finish);
}
return it_flag.first->second.get();
} else {
return it_flag.first->second.get();
}
}
void SecretChatsManager::on_qts_ack(PtsManager::PtsId qts_ack_token) {
auto old_qts = qts_manager_.db_pts();
auto new_qts = qts_manager_.finish(qts_ack_token);
if (old_qts != new_qts) {
save_qts();
}
}
void SecretChatsManager::save_qts() {
LOG(INFO) << "Save " << tag("qts", qts_manager_.db_pts());
send_closure(G()->td(), &Td::update_qts, qts_manager_.db_pts());
}
void SecretChatsManager::hangup() {
close_flag_ = true;
if (dummy_mode_) {
return stop();
}
for (auto &it : id_to_actor_) {
LOG(INFO) << "Ask close SecretChatActor " << tag("id", it.first);
it.second.reset();
}
if (id_to_actor_.empty()) {
stop();
}
}
void SecretChatsManager::hangup_shared() {
CHECK(!dummy_mode_);
auto token = get_link_token();
auto it = id_to_actor_.find(static_cast<int32>(token));
if (it != id_to_actor_.end()) {
LOG(INFO) << "Close SecretChatActor " << tag("id", it->first);
it->second.release();
id_to_actor_.erase(it);
} else {
LOG(FATAL) << "Unknown SecretChatActor hangup " << tag("id", static_cast<int32>(token));
}
if (close_flag_ && id_to_actor_.empty()) {
stop();
}
}
void SecretChatsManager::timeout_expired() {
flush_pending_chat_updates();
}
void SecretChatsManager::flush_pending_chat_updates() {
if (close_flag_ || dummy_mode_) {
return;
}
auto it = pending_chat_updates_.begin();
while (it != pending_chat_updates_.end() && (it->first.is_in_past() || is_online_)) {
do_update_chat(std::move(it->second));
++it;
}
if (it != pending_chat_updates_.end()) {
set_timeout_at(it->first.at());
}
pending_chat_updates_.erase(pending_chat_updates_.begin(), it);
}
void SecretChatsManager::on_online(bool is_online) {
if (is_online_ == is_online) {
return;
}
is_online_ = is_online;
flush_pending_chat_updates();
}
} // namespace td