path: root/test/Metadata.cpp

/*
    This file is part of solidity.

    solidity 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.

    solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @date 2017
 * Metadata processing helpers.
 */

#include <string>
#include <iostream>
#include <libdevcore/JSON.h>

using namespace std;

namespace dev
{
namespace test
{

string bytecodeSansMetadata(string const& _bytecode)
{
    /// The metadata hash takes up 43 bytes (or 86 characters in hex)
    /// /a165627a7a72305820([0-9a-f]{64})0029$/

    if (_bytecode.size() < 88)
        return _bytecode;

    if (_bytecode.substr(_bytecode.size() - 4, 4) != "0029")
        return _bytecode;

    if (_bytecode.substr(_bytecode.size() - 86, 18) != "a165627a7a72305820")
        return _bytecode;

    return _bytecode.substr(0, _bytecode.size() - 86);
}

bool isValidMetadata(string const& _metadata)
{
    Json::Value metadata;
    if (!Json::Reader().parse(_metadata, metadata, false))
        return false;

    if (
        !metadata.isObject() ||
        !metadata.isMember("version") ||
        !metadata.isMember("language") ||
        !metadata.isMember("compiler") ||
        !metadata.isMember("settings") ||
        !metadata.isMember("sources") ||
        !metadata.isMember("output")
    )
        return false;

    if (!metadata["version"].isNumeric() || metadata["version"] != 1)
        return false;

    if (!metadata["language"].isString() || metadata["language"].asString() != "Solidity")
        return false;

    /// @TODO add more strict checks

    return true;
}

}
} // end namespaces