// Copyright (c) 2021-present The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <net_types.h>

#include <logging.h>

#include <netaddress.h>

#include <netbase.h>

#include <univalue.h>

static const char* BANMAN_JSON_VERSION_KEY{"version"};

CBanEntry::CBanEntry(const UniValue& json)

    : nVersion(json[BANMAN_JSON_VERSION_KEY].getInt<int>()),

      nCreateTime(json["ban_created"].getInt<int64_t>()),

      nBanUntil(json["banned_until"].getInt<int64_t>())

{

}

UniValue CBanEntry::ToJson() const

{

    UniValue json(UniValue::VOBJ);

    json.pushKV(BANMAN_JSON_VERSION_KEY, nVersion);

    json.pushKV("ban_created", nCreateTime);

    json.pushKV("banned_until", nBanUntil);

    return json;

}

static const char* BANMAN_JSON_ADDR_KEY = "address";

/**

 * Convert a `banmap_t` object to a JSON array.

 * @param[in] bans Bans list to convert.

 * @return a JSON array, similar to the one returned by the `listbanned` RPC. Suitable for

 * passing to `BanMapFromJson()`.

 */

UniValue BanMapToJson(const banmap_t& bans)

{

    UniValue bans_json(UniValue::VARR);

    for (const auto& it : bans) {

        const auto& address = it.first;

        const auto& ban_entry = it.second;

        UniValue j = ban_entry.ToJson();

        j.pushKV(BANMAN_JSON_ADDR_KEY, address.ToString());

        bans_json.push_back(std::move(j));

    }

    return bans_json;

}

/**

 * Convert a JSON array to a `banmap_t` object.

 * @param[in] bans_json JSON to convert, must be as returned by `BanMapToJson()`.

 * @param[out] bans Bans list to create from the JSON.

 * @throws std::runtime_error if the JSON does not have the expected fields or they contain

 * unparsable values.

 */

void BanMapFromJson(const UniValue& bans_json, banmap_t& bans)

{

    for (const auto& ban_entry_json : bans_json.getValues()) {

        const int version{ban_entry_json[BANMAN_JSON_VERSION_KEY].getInt<int>()};

        if (version != CBanEntry::CURRENT_VERSION) {

            LogInfo("Dropping entry with unknown version (%s) from ban list\n", version);

            continue;

        }

        const auto& subnet_str = ban_entry_json[BANMAN_JSON_ADDR_KEY].get_str();

        const CSubNet subnet{LookupSubNet(subnet_str)};

        if (!subnet.IsValid()) {

            LogInfo("Dropping entry with unparseable address or subnet (%s) from ban list\n", subnet_str);

            continue;

        }

        bans.insert_or_assign(subnet, CBanEntry{ban_entry_json});

    }

}