tdlight/td/mtproto/AuthData.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// 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)
//
#pragma once
#include "td/mtproto/AuthKey.h"
#include "td/utils/common.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include <set>
namespace td {
namespace mtproto {
struct ServerSalt {
int64 salt;
double valid_since;
double valid_until;
};
template <class StorerT>
void store(const ServerSalt &salt, StorerT &storer) {
storer.template store_binary<int64>(salt.salt);
storer.template store_binary<double>(salt.valid_since);
storer.template store_binary<double>(salt.valid_until);
}
template <class ParserT>
void parse(ServerSalt &salt, ParserT &parser) {
salt.salt = parser.fetch_long();
salt.valid_since = parser.fetch_double();
salt.valid_until = parser.fetch_double();
}
class MessageIdDuplicateChecker {
public:
Status check(int64 message_id);
private:
static constexpr size_t MAX_SAVED_MESSAGE_IDS = 1000;
std::set<int64> saved_message_ids_;
};
class AuthData {
public:
AuthData();
AuthData(const AuthData &) = default;
AuthData &operator=(const AuthData &) = delete;
AuthData(AuthData &&) = delete;
AuthData &operator=(AuthData &&) = delete;
~AuthData() = default;
bool is_ready(double now);
void set_main_auth_key(AuthKey auth_key) {
main_auth_key_ = std::move(auth_key);
}
const AuthKey &get_main_auth_key() const {
// CHECK(has_main_auth_key());
return main_auth_key_;
}
bool has_main_auth_key() const {
return !main_auth_key_.empty();
}
bool need_main_auth_key() const {
return !has_main_auth_key();
}
void set_tmp_auth_key(AuthKey auth_key) {
CHECK(!auth_key.empty());
tmp_auth_key_ = std::move(auth_key);
}
const AuthKey &get_tmp_auth_key() const {
// CHECK(has_tmp_auth_key());
return tmp_auth_key_;
}
bool was_tmp_auth_key() const {
return use_pfs() && !tmp_auth_key_.empty();
}
bool need_tmp_auth_key(double now) const {
if (!use_pfs()) {
return false;
}
if (tmp_auth_key_.empty()) {
return true;
}
if (now > tmp_auth_key_.expires_at() - 60 * 60 * 2 /*2 hours*/) {
return true;
}
if (!has_tmp_auth_key(now)) {
return true;
}
return false;
}
void drop_main_auth_key() {
main_auth_key_ = AuthKey();
}
void drop_tmp_auth_key() {
tmp_auth_key_ = AuthKey();
}
bool has_tmp_auth_key(double now) const {
if (!use_pfs()) {
return false;
}
if (tmp_auth_key_.empty()) {
return false;
}
if (now > tmp_auth_key_.expires_at() - 60 * 60 /*1 hour*/) {
return false;
}
return true;
}
const AuthKey &get_auth_key() const {
if (use_pfs()) {
return get_tmp_auth_key();
}
return get_main_auth_key();
}
bool has_auth_key(double now) const {
if (use_pfs()) {
return has_tmp_auth_key(now);
}
return has_main_auth_key();
}
bool get_auth_flag() const {
return main_auth_key_.auth_flag();
}
void set_auth_flag(bool auth_flag) {
main_auth_key_.set_auth_flag(auth_flag);
if (!auth_flag) {
drop_tmp_auth_key();
}
}
bool get_bind_flag() const {
return !use_pfs() || tmp_auth_key_.auth_flag();
}
void on_bind() {
CHECK(use_pfs());
tmp_auth_key_.set_auth_flag(true);
}
Slice get_header() const {
if (use_pfs()) {
return tmp_auth_key_.need_header() ? Slice(header_) : Slice();
} else {
return main_auth_key_.need_header() ? Slice(header_) : Slice();
}
}
void set_header(std::string header) {
header_ = std::move(header);
}
void on_api_response() {
if (use_pfs()) {
if (tmp_auth_key_.auth_flag()) {
tmp_auth_key_.set_need_header(false);
}
} else {
if (main_auth_key_.auth_flag()) {
main_auth_key_.set_need_header(false);
}
}
}
void set_session_id(uint64 session_id) {
session_id_ = session_id;
}
uint64 get_session_id() const {
CHECK(session_id_ != 0);
return session_id_;
}
double get_server_time(double now) const {
return server_time_difference_ + now;
}
double get_server_time_difference() const {
return server_time_difference_;
}
// diff == msg_id / 2^32 - now == old_server_now - now <= server_now - now
// server_time_difference >= max{diff}
bool update_server_time_difference(double diff);
void set_server_time_difference(double diff) {
server_time_difference_was_updated_ = false;
server_time_difference_ = diff;
}
uint64 get_server_salt(double now) {
update_salt(now);
return server_salt_.salt;
}
void set_server_salt(uint64 salt, double now) {
server_salt_.salt = salt;
double server_time = get_server_time(now);
server_salt_.valid_since = server_time;
server_salt_.valid_until = server_time + 60 * 10;
future_salts_.clear();
}
bool is_server_salt_valid(double now) const {
return server_salt_.valid_until > get_server_time(now) + 60;
}
bool has_salt(double now) {
update_salt(now);
return is_server_salt_valid(now);
}
bool need_future_salts(double now) {
update_salt(now);
return future_salts_.empty() || !is_server_salt_valid(now);
}
void set_future_salts(const std::vector<ServerSalt> &salts, double now);
std::vector<ServerSalt> get_future_salts() const;
int64 next_message_id(double now);
bool is_valid_outbound_msg_id(int64 id, double now) const;
bool is_valid_inbound_msg_id(int64 id, double now) const;
Status check_packet(int64 session_id, int64 message_id, double now, bool &time_difference_was_updated);
Status check_update(int64 message_id) {
return updates_duplicate_checker_.check(message_id);
}
int32 next_seq_no(bool is_content_related) {
int32 res = seq_no_;
if (is_content_related) {
res |= 1;
seq_no_ += 2;
}
return res;
}
void clear_seq_no() {
seq_no_ = 0;
}
void set_use_pfs(bool use_pfs) {
use_pfs_ = use_pfs;
}
bool use_pfs() const {
return use_pfs_;
}
private:
bool use_pfs_ = true;
AuthKey main_auth_key_;
AuthKey tmp_auth_key_;
bool server_time_difference_was_updated_ = false;
double server_time_difference_ = 0;
ServerSalt server_salt_;
int64 last_message_id_ = 0;
int32 seq_no_ = 0;
std::string header_;
uint64 session_id_ = 0;
std::vector<ServerSalt> future_salts_;
MessageIdDuplicateChecker duplicate_checker_;
MessageIdDuplicateChecker updates_duplicate_checker_;
void update_salt(double now);
};
} // namespace mtproto
} // namespace td