AccountCurrencies.cpp

#include <xrpld/rpc/Context.h>
#include <xrpld/rpc/detail/RPCLedgerHelpers.h>
#include <xrpld/rpc/detail/TrustLine.h>
 
#include <xrpl/json/json_value.h>
#include <xrpl/ledger/ReadView.h>
#include <xrpl/protocol/AccountID.h>
#include <xrpl/protocol/ErrorCodes.h>
#include <xrpl/protocol/Indexes.h>
#include <xrpl/protocol/RPCErr.h>
#include <xrpl/protocol/STAmount.h>
#include <xrpl/protocol/UintTypes.h>
#include <xrpl/protocol/jss.h>
 
#include <memory>
#include <set>
#include <string>
 
namespace xrpl {
 
json::Value
doAccountCurrencies(rpc::JsonContext& context)
{
    auto& params = context.params;
 
    if (!(params.isMember(jss::account) || params.isMember(jss::ident)))
        return rpc::missingFieldError(jss::account);
 
    std::string strIdent;
    if (params.isMember(jss::account))
    {
        if (!params[jss::account].isString())
            return rpc::invalidFieldError(jss::account);
        strIdent = params[jss::account].asString();
    }
    else if (params.isMember(jss::ident))
    {
        if (!params[jss::ident].isString())
            return rpc::invalidFieldError(jss::ident);
        strIdent = params[jss::ident].asString();
    }
 
    // Get the current ledger
    std::shared_ptr<ReadView const> ledger;
    auto result = rpc::lookupLedger(ledger, context);
    if (!ledger)
        return result;
 
    // Get info on account.
    auto id = parseBase58<AccountID>(strIdent);
    if (!id)
    {
        rpc::injectError(RpcActMalformed, result);
        return result;
    }
    auto const accountID{id.value()};
 
    if (!ledger->exists(keylet::account(accountID)))
        return rpcError(RpcActNotFound);
 
    std::set<Currency> send, receive;
    for (auto const& rspEntry : RPCTrustLine::getItems(accountID, *ledger))
    {
        STAmount const& saBalance = rspEntry.getBalance();
 
        if (saBalance < rspEntry.getLimit())
            receive.insert(saBalance.get<Issue>().currency);
        if ((-saBalance) < rspEntry.getLimitPeer())
            send.insert(saBalance.get<Issue>().currency);
    }
 
    send.erase(badCurrency());
    receive.erase(badCurrency());
 
    json::Value& sendCurrencies = (result[jss::send_currencies] = json::ValueType::Array);
    for (auto const& c : send)
        sendCurrencies.append(to_string(c));
 
    json::Value& recvCurrencies = (result[jss::receive_currencies] = json::ValueType::Array);
    for (auto const& c : receive)
        recvCurrencies.append(to_string(c));
 
    return result;
}
 
}  // namespace xrpl