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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (c) 2013-2014, Regents of the University of California.
* All rights reserved.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* This file licensed under New BSD License. See COPYING for detailed information about
* ndn-cxx library copyright, permissions, and redistribution restrictions.
*/
#ifndef NDN_HELPERS_COMMAND_INTEREST_GENERATOR_HPP
#define NDN_HELPERS_COMMAND_INTEREST_GENERATOR_HPP
#include "../interest.hpp"
#include "../security/key-chain.hpp"
#include "../util/time.hpp"
#include "../util/random.hpp"
namespace ndn {
/**
* @brief Helper class to generate CommandInterests
*
* @see http://redmine.named-data.net/projects/nfd/wiki/Command_Interests
*/
class CommandInterestGenerator
{
public:
static const Name DEFAULT_CERTIFICATE_NAME;
CommandInterestGenerator()
: m_lastTimestamp(time::toUnixTimestamp(time::system_clock::now()))
{
}
virtual
~CommandInterestGenerator()
{
}
void
generate(Interest& interest, const Name& certificateName = Name());
void
generateWithIdentity(Interest& interest, const Name& identity);
private:
time::milliseconds m_lastTimestamp;
KeyChain m_keyChain;
};
inline void
CommandInterestGenerator::generate(Interest& interest,
const Name& certificateName /*= Name()*/)
{
time::milliseconds timestamp = time::toUnixTimestamp(time::system_clock::now());
while(timestamp <= m_lastTimestamp)
{
timestamp += time::milliseconds(1);
}
Name commandInterestName = interest.getName();
commandInterestName
.append(name::Component::fromNumber(timestamp.count()))
.append(name::Component::fromNumber(random::generateWord64()));
interest.setName(commandInterestName);
if (certificateName.empty())
m_keyChain.sign(interest);
else
m_keyChain.sign(interest, certificateName);
m_lastTimestamp = timestamp;
}
inline void
CommandInterestGenerator::generateWithIdentity(Interest& interest, const Name& identity)
{
time::milliseconds timestamp = time::toUnixTimestamp(time::system_clock::now());
while(timestamp <= m_lastTimestamp)
{
timestamp += time::milliseconds(1);
}
Name commandInterestName = interest.getName();
commandInterestName
.append(name::Component::fromNumber(timestamp.count()))
.append(name::Component::fromNumber(random::generateWord64()));
interest.setName(commandInterestName);
m_keyChain.signByIdentity(interest, identity);
m_lastTimestamp = timestamp;
}
} // namespace ndn
#endif // NDN_HELPERS_COMMAND_INTEREST_GENERATOR_HPP