thehub/hub/server/core_read.cpp

/*
 * This file is part of the Flowee project
 * Copyright (c) 2009-2015 The Bitcoin Core developers
 *
 * This program 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.
 *
 * 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/>.
 */


#include "core_io.h"

#include "primitives/MutableBlock.h"
#include "primitives/transaction.h"
#include "primitives/script.h"
#include "serialize.h"
#include "streaming/streams.h"
#include <univalue.h>
#include "utilstrencodings.h"
#include <BitcoinVersion.h>

#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/split.hpp>

CScript ParseScript(const std::string& s)
{
    CScript result;

    static std::map<std::string, opcodetype> mapOpNames;

    if (mapOpNames.empty())
    {
        for (int op = 0; op <= OP_NOP10; op++)
        {
            // Allow OP_RESERVED to get into mapOpNames
            if (op < OP_NOP && op != OP_RESERVED)
                continue;

            const char* name = GetOpName((opcodetype)op);
            if (strcmp(name, "OP_UNKNOWN") == 0)
                continue;
            std::string strName(name);
            mapOpNames[strName] = (opcodetype)op;
            // Convenience: OP_ADD and just ADD are both recognized:
            boost::algorithm::replace_first(strName, "OP_", "");
            mapOpNames[strName] = (opcodetype)op;
        }
        const auto addAlias = [&](const char *name, opcodetype op) {
            mapOpNames[name] = op;
            std::string shortName(name);
            boost::algorithm::replace_first(shortName, "OP_", "");
            mapOpNames[shortName] = op;
        };
        addAlias("OP_VERIF", OP_VERIF);
        addAlias("OP_VERNOTIF", OP_VERNOTIF);
        addAlias("OP_RESERVED1", OP_RESERVED1);
        addAlias("OP_RESERVED2", OP_RESERVED2);
        addAlias("OP_2MUL", OP_2MUL);
        addAlias("OP_2DIV", OP_2DIV);
        addAlias("OP_LSHIFT", OP_LSHIFT);
        addAlias("OP_RSHIFT", OP_RSHIFT);
    }

    std::vector<std::string> words;
    boost::algorithm::split(words, s, boost::algorithm::is_any_of(" \t\n"), boost::algorithm::token_compress_on);

    for (std::vector<std::string>::const_iterator w = words.begin(); w != words.end(); ++w)
    {
        if (w->empty())
        {
            // Empty string, ignore. (boost::split given '' will return one word)
        }
        else if (all(*w, boost::algorithm::is_digit()) ||
            (boost::algorithm::starts_with(*w, "-") && all(std::string(w->begin()+1, w->end()), boost::algorithm::is_digit())))
        {
            // Number
            int64_t n = atoi64(*w);
            result << n;
        }
        else if (boost::algorithm::starts_with(*w, "0x") && (w->begin()+2 != w->end()) && IsHex(std::string(w->begin()+2, w->end())))
        {
            // Raw hex data, inserted NOT pushed onto stack:
            std::vector<unsigned char> raw = ParseHex(std::string(w->begin()+2, w->end()));
            result.insert(result.end(), raw.begin(), raw.end());
        }
        else if (w->size() >= 2 && boost::algorithm::starts_with(*w, "'") && boost::algorithm::ends_with(*w, "'"))
        {
            // Single-quoted string, pushed as data. NOTE: this is poor-man's
            // parsing, spaces/tabs/newlines in single-quoted strings won't work.
            std::vector<unsigned char> value(w->begin()+1, w->end()-1);
            result << value;
        }
        else if (mapOpNames.count(*w))
        {
            // opcode, e.g. OP_ADD or ADD:
            result << mapOpNames[*w];
        }
        else
        {
            throw std::runtime_error("script parse error");
        }
    }

    return result;
}

bool DecodeHexTx(CTransaction& tx, const std::string& strHexTx)
{
    if (!IsHex(strHexTx))
        return false;

    std::vector<unsigned char> txData(ParseHex(strHexTx));
    CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
    try {
        ssData >> tx;
    }
    catch (const std::exception&) {
        return false;
    }

    return true;
}

bool DecodeHexBlk(MutableBlock& block, const std::string& strHexBlk)
{
    if (!IsHex(strHexBlk))
        return false;

    std::vector<unsigned char> blockData(ParseHex(strHexBlk));
    CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
    try {
        ssBlock >> block;
    }
    catch (const std::exception&) {
        return false;
    }

    return true;
}

uint256 ParseHashUV(const UniValue& v, const std::string& strName)
{
    std::string strHex;
    if (v.isStr())
        strHex = v.getValStr();
    return ParseHashStr(strHex, strName);  // Note: ParseHashStr("") throws a runtime_error
}

uint256 ParseHashStr(const std::string& strHex, const std::string& strName)
{
    if (!IsHex(strHex)) // Note: IsHex("") is false
        throw std::runtime_error(strName+" must be hexadecimal string (not '"+strHex+"')");

    uint256 result;
    result.SetHex(strHex);
    return result;
}

std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
{
    std::string strHex;
    if (v.isStr())
        strHex = v.getValStr();
    if (!IsHex(strHex))
        throw std::runtime_error(strName+" must be hexadecimal string (not '"+strHex+"')");
    return ParseHex(strHex);
}