You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
3.8 KiB
127 lines
3.8 KiB
/*
|
|
This file is part of cpp-ethereum.
|
|
|
|
cpp-ethereum is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
cpp-ethereum 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/** @file Message.h
|
|
* @author Gav Wood <i@gavwood.com>
|
|
* @date 2014
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <mutex>
|
|
#include <array>
|
|
#include <set>
|
|
#include <memory>
|
|
#include <utility>
|
|
#include <libdevcore/RLP.h>
|
|
#include <libdevcore/Guards.h>
|
|
#include <libdevcrypto/SHA3.h>
|
|
#include "Common.h"
|
|
|
|
namespace dev
|
|
{
|
|
namespace shh
|
|
{
|
|
|
|
class Message;
|
|
|
|
class Envelope
|
|
{
|
|
friend class Message;
|
|
|
|
public:
|
|
Envelope() {}
|
|
Envelope(RLP const& _m)
|
|
{
|
|
m_expiry = _m[0].toInt<unsigned>();
|
|
m_ttl = _m[1].toInt<unsigned>();
|
|
m_topic = (Topic)_m[2];
|
|
m_data = _m[3].toBytes();
|
|
m_nonce = _m[4].toInt<u256>();
|
|
}
|
|
|
|
operator bool() const { return !!m_expiry; }
|
|
|
|
void streamOut(RLPStream& _s, bool _withNonce) const { _s.appendList(_withNonce ? 5 : 4) << m_expiry << m_ttl << m_topic << m_data; if (_withNonce) _s << m_nonce; }
|
|
h256 sha3() const { RLPStream s; streamOut(s, true); return dev::sha3(s.out()); }
|
|
h256 sha3NoNonce() const { RLPStream s; streamOut(s, false); return dev::sha3(s.out()); }
|
|
|
|
unsigned sent() const { return m_expiry - m_ttl; }
|
|
unsigned expiry() const { return m_expiry; }
|
|
unsigned ttl() const { return m_ttl; }
|
|
Topic const& topic() const { return m_topic; }
|
|
bytes const& data() const { return m_data; }
|
|
|
|
Message open(Secret const& _s = Secret()) const;
|
|
|
|
unsigned workProved() const;
|
|
void proveWork(unsigned _ms);
|
|
|
|
private:
|
|
Envelope(unsigned _exp, unsigned _ttl, Topic const& _topic): m_expiry(_exp), m_ttl(_ttl), m_topic(_topic) {}
|
|
|
|
unsigned m_expiry = 0;
|
|
unsigned m_ttl = 0;
|
|
u256 m_nonce;
|
|
|
|
Topic m_topic;
|
|
bytes m_data;
|
|
};
|
|
|
|
enum /*Message Flags*/
|
|
{
|
|
ContainsSignature = 1
|
|
};
|
|
|
|
/// An (unencrypted) message, constructed from the combination of an Envelope, and, potentially,
|
|
/// a Secret key to decrypt the Message.
|
|
class Message
|
|
{
|
|
public:
|
|
Message() {}
|
|
Message(Envelope const& _e, Secret const& _s = Secret());
|
|
Message(bytes const& _payload): m_payload(_payload) {}
|
|
Message(bytesConstRef _payload): m_payload(_payload.toBytes()) {}
|
|
Message(bytes&& _payload) { std::swap(_payload, m_payload); }
|
|
|
|
Public from() const { return m_from; }
|
|
Public to() const { return m_to; }
|
|
bytes const& payload() const { return m_payload; }
|
|
|
|
void setFrom(Public _from) { m_from = _from; }
|
|
void setTo(Public _to) { m_to = _to; }
|
|
void setPayload(bytes const& _payload) { m_payload = _payload; }
|
|
void setPayload(bytes&& _payload) { swap(m_payload, _payload); }
|
|
|
|
operator bool() const { return !!m_payload.size() || m_from || m_to; }
|
|
|
|
/// Turn this message into a ditributable Envelope.
|
|
Envelope seal(Secret _from, Topic const& _topic, unsigned _workToProve = 50, unsigned _ttl = 50) const;
|
|
// Overloads for skipping _from or specifying _to.
|
|
Envelope seal(Topic const& _topic, unsigned _ttl = 50, unsigned _workToProve = 50) const { return seal(Secret(), _topic, _workToProve, _ttl); }
|
|
Envelope sealTo(Public _to, Topic const& _topic, unsigned _workToProve = 50, unsigned _ttl = 50) { m_to = _to; return seal(Secret(), _topic, _workToProve, _ttl); }
|
|
Envelope sealTo(Secret _from, Public _to, Topic const& _topic, unsigned _workToProve = 50, unsigned _ttl = 50) { m_to = _to; return seal(_from, _topic, _workToProve, _ttl); }
|
|
|
|
private:
|
|
bool populate(bytes const& _data);
|
|
|
|
Public m_from;
|
|
Public m_to;
|
|
bytes m_payload;
|
|
};
|
|
|
|
}
|
|
}
|
|
|