/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see .
Copyright 2017-2019 Telegram Systems LLP
*/
#include "overlay-broadcast.hpp"
#include "overlay.hpp"
#include "keys/encryptor.h"
namespace ton {
namespace overlay {
td::Status BroadcastSimple::check_time() {
return overlay_->check_date(date_);
}
td::Status BroadcastSimple::check_duplicate() {
return overlay_->check_delivered(broadcast_hash_);
}
td::Status BroadcastSimple::check_source() {
return overlay_->check_source_eligible(source_, cert_.get(), data_size());
}
td::BufferSlice BroadcastSimple::to_sign() {
return create_serialize_tl_object(broadcast_hash_, date_);
}
td::Status BroadcastSimple::check_signature() {
TRY_RESULT(encryptor, overlay_->get_encryptor(source_));
return encryptor->check_signature(to_sign().as_slice(), signature_.as_slice());
}
td::Status BroadcastSimple::run_checks() {
TRY_STATUS(check_time());
TRY_STATUS(check_duplicate());
TRY_STATUS(check_source());
TRY_STATUS(check_signature());
return td::Status::OK();
}
td::Status BroadcastSimple::distribute() {
auto B = serialize();
auto nodes = overlay_->get_neighbours(3);
auto manager = overlay_->overlay_manager();
for (auto &n : nodes) {
td::actor::send_closure(manager, &OverlayManager::send_message, n, overlay_->local_id(), overlay_->overlay_id(),
B.clone());
}
return td::Status::OK();
}
tl_object_ptr BroadcastSimple::tl() const {
return create_tl_object(source_.tl(), cert_ ? cert_->tl() : Certificate::empty_tl(),
flags_, data_.clone(), date_, signature_.clone());
}
td::BufferSlice BroadcastSimple::serialize() {
return serialize_tl_object(tl(), true);
}
td::Status BroadcastSimple::create(OverlayImpl *overlay, tl_object_ptr broadcast) {
auto src = PublicKey{broadcast->src_};
auto data_hash = sha256_bits256(broadcast->data_.as_slice());
auto broadcast_hash = compute_broadcast_id(src, data_hash, broadcast->flags_);
TRY_STATUS(overlay->check_date(broadcast->date_));
TRY_STATUS(overlay->check_delivered(broadcast_hash));
TRY_RESULT(cert, Certificate::create(std::move(broadcast->certificate_)));
auto B = std::make_unique(broadcast_hash, src, std::move(cert), broadcast->flags_,
std::move(broadcast->data_), broadcast->date_,
std::move(broadcast->signature_), overlay);
TRY_STATUS(B->run());
overlay->register_simple_broadcast(std::move(B));
return td::Status::OK();
}
td::Status BroadcastSimple::create_new(td::actor::ActorId overlay,
td::actor::ActorId keyring, PublicKeyHash local_id,
td::BufferSlice data, td::uint32 flags) {
auto data_hash = sha256_bits256(data.as_slice());
auto broadcast_hash = compute_broadcast_id(local_id, data_hash, flags);
auto date = static_cast(td::Clocks::system());
auto B = std::make_unique(broadcast_hash, PublicKey{}, nullptr, flags, std::move(data), date,
td::BufferSlice{}, nullptr);
auto to_sign = B->to_sign();
auto P = td::PromiseCreator::lambda(
[id = overlay, B = std::move(B)](td::Result> R) mutable {
if (R.is_error()) {
td::actor::send_closure(id, &OverlayImpl::failed_to_create_simple_broadcast, R.move_as_error());
return;
}
auto V = R.move_as_ok();
auto pub_id = V.second;
B->update_source(pub_id);
B->update_signature(std::move(V.first));
td::actor::send_closure(id, &OverlayImpl::created_simple_broadcast, std::move(B));
});
td::actor::send_closure(keyring, &keyring::Keyring::sign_add_get_public_key, local_id, std::move(to_sign),
std::move(P));
return td::Status::OK();
}
Overlay::BroadcastHash BroadcastSimple::compute_broadcast_id(PublicKeyHash source, Overlay::BroadcastDataHash data_hash,
td::uint32 flags) {
auto obj = create_tl_object(
(flags & Overlays::BroadcastFlagAnySender()) ? PublicKeyHash::zero().tl() : source.tl(), data_hash, flags);
return get_tl_object_sha_bits256(obj);
}
Overlay::BroadcastHash BroadcastSimple::compute_broadcast_id(PublicKey source, Overlay::BroadcastDataHash data_hash,
td::uint32 flags) {
return compute_broadcast_id(source.compute_short_id(), data_hash, flags);
}
void BroadcastSimple::update_overlay(OverlayImpl *overlay) {
if (overlay_) {
return;
}
overlay_ = overlay;
cert_ = overlay->get_certificate(source_.compute_short_id());
}
void BroadcastSimple::deliver() {
overlay_->deliver_broadcast(source_.compute_short_id(), data_.clone());
}
} // namespace overlay
} // namespace ton