numericbuilder.h

/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2018-2020 Sadie Powell <[email protected]>
 *   Copyright (C) 2015-2016 Attila Molnar <[email protected]>
 *
 * This file is part of InspIRCd.  InspIRCd 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, version 2.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 
#pragma once
 
namespace Numeric
{
        class WriteNumericSink;
        class WriteRemoteNumericSink;
 
        template <char Sep, bool SendEmpty, typename Sink>
        class GenericBuilder;
 
        template <char Sep = ',', bool SendEmpty = false>
        class Builder;
 
        template <unsigned int NumStaticParams, bool SendEmpty, typename Sink>
        class GenericParamBuilder;
 
        template <unsigned int NumStaticParams, bool SendEmpty = false>
        class ParamBuilder;
}
 
class Numeric::WriteNumericSink
{
        LocalUser* const user;
 
 public:
        WriteNumericSink(LocalUser* u)
                : user(u)
        {
        }
 
        void operator()(Numeric& numeric) const
        {
                user->WriteNumeric(numeric);
        }
};
 
class Numeric::WriteRemoteNumericSink
{
        User* const user;
 
 public:
        WriteRemoteNumericSink(User* u)
                : user(u)
        {
        }
 
        void operator()(Numeric& numeric) const
        {
                user->WriteRemoteNumeric(numeric);
        }
};
 
template <char Sep, bool SendEmpty, typename Sink>
class Numeric::GenericBuilder
{
        Sink sink;
        Numeric numeric;
        const std::string::size_type max;
 
        bool HasRoom(const std::string::size_type additional) const
        {
                return (numeric.GetParams().back().size() + additional <= max);
        }
 
 public:
        GenericBuilder(Sink s, unsigned int num, bool addparam = true, size_t additionalsize = 0)
                : sink(s)
                , numeric(num)
                , max(ServerInstance->Config->Limits.MaxLine - ServerInstance->Config->GetServerName().size() - additionalsize - 10)
        {
                if (addparam)
                        numeric.push(std::string());
        }
 
        Numeric& GetNumeric() { return numeric; }
 
        void Add(const std::string& entry)
        {
                if (!HasRoom(entry.size()))
                        Flush();
                numeric.GetParams().back().append(entry).push_back(Sep);
        }
 
        void Add(const std::string& entry1, const std::string& entry2)
        {
                if (!HasRoom(entry1.size() + entry2.size()))
                        Flush();
                numeric.GetParams().back().append(entry1).append(entry2).push_back(Sep);
        }
 
        void Flush()
        {
                std::string& data = numeric.GetParams().back();
                if (IsEmpty())
                {
                        if (!SendEmpty)
                                return;
                }
                else
                {
                        data.erase(data.size()-1);
                }
 
                sink(numeric);
                data.clear();
        }
 
        bool IsEmpty() const { return (numeric.GetParams().back().empty()); }
};
 
template <char Sep, bool SendEmpty>
class Numeric::Builder : public GenericBuilder<Sep, SendEmpty, WriteNumericSink>
{
 public:
        Builder(LocalUser* user, unsigned int num, bool addparam = true, size_t additionalsize = 0)
                : ::Numeric::GenericBuilder<Sep, SendEmpty, WriteNumericSink>(WriteNumericSink(user), num, addparam, additionalsize + user->nick.size())
        {
        }
};
 
template <unsigned int NumStaticParams, bool SendEmpty, typename Sink>
class Numeric::GenericParamBuilder
{
        Sink sink;
        Numeric numeric;
        std::string::size_type currlen;
        std::string::size_type max;
 
        bool HasRoom(const std::string::size_type additional) const
        {
                return (currlen + additional <= max);
        }
 
 public:
        GenericParamBuilder(Sink s, unsigned int num, size_t additionalsize)
                : sink(s)
                , numeric(num)
                , currlen(0)
                , max(ServerInstance->Config->Limits.MaxLine - ServerInstance->Config->GetServerName().size() - additionalsize - 10)
        {
        }
 
        void AddStatic(const std::string& entry)
        {
                max -= (entry.length() + 1);
                numeric.GetParams().push_back(entry);
        }
 
        void Add(const std::string& entry)
        {
                if (!HasRoom(entry.size()))
                        Flush();
 
                currlen += entry.size() + 1;
                numeric.GetParams().push_back(entry);
        }
 
        void Flush()
        {
                if ((!SendEmpty) && (IsEmpty()))
                        return;
 
                sink(numeric);
                currlen = 0;
                numeric.GetParams().erase(numeric.GetParams().begin() + NumStaticParams, numeric.GetParams().end());
        }
 
        bool IsEmpty() const { return (numeric.GetParams().size() <= NumStaticParams); }
};
 
template <unsigned int NumStaticParams, bool SendEmpty>
class Numeric::ParamBuilder : public GenericParamBuilder<NumStaticParams, SendEmpty, WriteNumericSink>
{
 public:
        ParamBuilder(LocalUser* user, unsigned int num)
                : ::Numeric::GenericParamBuilder<NumStaticParams, SendEmpty, WriteNumericSink>(WriteNumericSink(user), num, user->nick.size())
        {
        }
};
 
namespace Numerics
{
        class CannotSendTo;
        class InvalidModeParameter;
        class NoSuchChannel;
        class NoSuchNick;
}
 
class Numerics::CannotSendTo : public Numeric::Numeric
{
 public:
        CannotSendTo(Channel* chan, const std::string& message)
                : Numeric(ERR_CANNOTSENDTOCHAN)
        {
                push(chan->name);
                push(message);
        }
 
        CannotSendTo(Channel* chan, const std::string& what, ModeHandler* mh)
                : Numeric(ERR_CANNOTSENDTOCHAN)
        {
                push(chan->name);
                push(InspIRCd::Format("You cannot send %s to this channel whilst the +%c (%s) mode is set.",
                        what.c_str(), mh->GetModeChar(), mh->name.c_str()));
        }
 
        CannotSendTo(Channel* chan, const std::string& what, char extban, const std::string& extbandesc)
                : Numeric(ERR_CANNOTSENDTOCHAN)
        {
                push(chan->name);
                push(InspIRCd::Format("You cannot send %s to this channel whilst %s %c: (%s) extban is set matching you.",
                        what.c_str(), strchr("AEIOUaeiou", extban) ? "an" : "a", extban, extbandesc.c_str()));
        }
 
        CannotSendTo(User* user, const std::string& message)
                : Numeric(ERR_CANTSENDTOUSER)
        {
                push(user->registered & REG_NICK ? user->nick : "*");
                push(message);
        }
 
        CannotSendTo(User* user, const std::string& what, ModeHandler* mh, bool self = false)
                : Numeric(ERR_CANTSENDTOUSER)
        {
                push(user->registered & REG_NICK ? user->nick : "*");
                push(InspIRCd::Format("You cannot send %s to this user whilst %s have the +%c (%s) mode set.",
                        what.c_str(), self ? "you" : "they", mh->GetModeChar(), mh->name.c_str()));
        }
};
 
/* Builder for the ERR_INVALIDMODEPARAM numeric. */
class Numerics::InvalidModeParameter : public Numeric::Numeric
{
 private:
        void push_message(ModeHandler* mode, const std::string& message)
        {
                if (!message.empty())
                {
                        // The caller has specified their own message.
                        push(message);
                        return;
                }
 
                const std::string& syntax = mode->GetSyntax();
                if (!syntax.empty())
                {
                        // If the mode has a syntax hint we include it in the message.
                        push(InspIRCd::Format("Invalid %s mode parameter. Syntax: %s.", mode->name.c_str(), syntax.c_str()));
                }
                else
                {
                        // Otherwise, send it without.
                        push(InspIRCd::Format("Invalid %s mode parameter.", mode->name.c_str()));
                }
        }
 
 public:
        InvalidModeParameter(Channel* chan, ModeHandler* mode, const std::string& parameter, const std::string& message = "")
                : Numeric(ERR_INVALIDMODEPARAM)
        {
                push(chan->name);
                push(mode->GetModeChar());
                push(parameter);
                push_message(mode, message);
        }
 
        InvalidModeParameter(User* user, ModeHandler* mode, const std::string& parameter, const std::string& message = "")
                : Numeric(ERR_INVALIDMODEPARAM)
        {
                push(user->registered & REG_NICK ? user->nick : "*");
                push(mode->GetModeChar());
                push(parameter);
                push_message(mode, message);
        }
};
 
class Numerics::NoSuchChannel : public Numeric::Numeric
{
 public:
        NoSuchChannel(const std::string& chan)
                : Numeric(ERR_NOSUCHCHANNEL)
        {
                push(chan.empty() ? "*" : chan);
                push("No such channel");
        }
};
 
class Numerics::NoSuchNick : public Numeric::Numeric
{
 public:
        NoSuchNick(const std::string& nick)
                : Numeric(ERR_NOSUCHNICK)
        {
                push(nick.empty() ? "*" : nick);
                push("No such nick");
        }
};