/*
 * This file is part of the Flowee project
 * Copyright (C) 2010 Satoshi Nakamoto
 * 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 "rpcprotocol.h"
#include "util.h"

#include "random.h"
#include "tinyformat.h"
#include "utilstrencodings.h"
#include "utiltime.h"

#include <fstream>

/**
 * JSON-RPC protocol.  Bitcoin speaks version 1.0 for maximum compatibility,
 * but uses JSON-RPC 1.1/2.0 standards for parts of the 1.0 standard that were
 * unspecified (HTTP errors and contents of 'error').
 *
 * 1.0 spec: http://json-rpc.org/wiki/specification
 * 1.2 spec: http://jsonrpc.org/historical/json-rpc-over-http.html
 */

std::string JSONRPCRequest(const std::string& strMethod, const UniValue& params, const UniValue& id)
{
    UniValue request(UniValue::VOBJ);
    request.push_back(Pair("method", strMethod));
    request.push_back(Pair("params", params));
    request.push_back(Pair("id", id));
    return request.write() + "\n";
}

UniValue JSONRPCReplyObj(const UniValue& result, const UniValue& error, const UniValue& id)
{
    UniValue reply(UniValue::VOBJ);
    if (!error.isNull())
        reply.push_back(Pair("result", NullUniValue));
    else
        reply.push_back(Pair("result", result));
    reply.push_back(Pair("error", error));
    reply.push_back(Pair("id", id));
    return reply;
}

std::string JSONRPCReply(const UniValue& result, const UniValue& error, const UniValue& id)
{
    UniValue reply = JSONRPCReplyObj(result, error, id);
    return reply.write() + "\n";
}

UniValue JSONRPCError(int code, const std::string& message)
{
    UniValue error(UniValue::VOBJ);
    error.push_back(Pair("code", code));
    error.push_back(Pair("message", message));
    return error;
}

/** Default name for auth cookie file */
static const std::string COOKIEAUTH_FILE = ".cookie";

boost::filesystem::path GetAuthCookieFile()
{
    boost::filesystem::path path(GetArg("-rpccookiefile", COOKIEAUTH_FILE));
    if (!path.is_absolute())
        path = GetDataDir() / path;
    return path;
}

bool GetAuthCookie(boost::filesystem::path filepath, std::string *cookie_out)
{
    std::ifstream file;
    std::string cookie;
    file.open(filepath.string().c_str());
    if (!file.is_open())
        return false;
    std::getline(file, cookie);
    file.close();

    if (cookie_out)
        *cookie_out = cookie;
    return true;
}

void DeleteAuthCookie()
{
    try {
        boost::filesystem::remove(GetAuthCookieFile());
    } catch (const boost::filesystem::filesystem_error& e) {
        LogPrintf("%s: Unable to remove random auth cookie file: %s\n", __func__, e.what());
    }
}