示例#1
0
    void testAddSub ()
    {
        testcase ("Addition & Subtraction");

        for (auto i : { -1, 0, 1})
        {
            XRPAmount const x (i);

            for (auto j : { -1, 0, 1})
            {
                XRPAmount const y (j);

                expect (XRPAmount(i + j) == (x + y));
                expect (XRPAmount(i - j) == (x - y));

                expect ((x + y) == (y + x));   // addition is commutative
            }
        }
    }
示例#2
0
// {
//   secret_key: <signing_secret_key>
//   channel_id: 256-bit channel id
//   drops: 64-bit uint (as string)
// }
Json::Value doChannelAuthorize (RPC::Context& context)
{
    auto const& params (context.params);
    for (auto const& p : {jss::secret, jss::channel_id, jss::amount})
        if (!params.isMember (p))
            return RPC::missing_field_error (p);

    Json::Value result;
    auto const keypair = RPC::keypairForSignature (params, result);
    if (RPC::contains_error (result))
        return result;

    uint256 channelId;
    if (!channelId.SetHexExact (params[jss::channel_id].asString ()))
        return rpcError (rpcCHANNEL_MALFORMED);

    std::uint64_t drops = 0;
    try
    {
        drops = std::stoul (params[jss::amount].asString ());
    }
    catch (std::exception const&)
    {
        return rpcError (rpcCHANNEL_AMT_MALFORMED);
    }

    Serializer msg;
    serializePayChanAuthorization (msg, channelId, XRPAmount (drops));

    try
    {
        auto const buf = sign (keypair.first, keypair.second, msg.slice ());
        result[jss::signature] = strHex (buf);
    }
    catch (std::exception&)
    {
        result =
            RPC::make_error (rpcINTERNAL, "Exception occurred during signing.");
    }
    return result;
}
示例#3
0
// {
//   public_key: <public_key>
//   channel_id: 256-bit channel id
//   drops: 64-bit uint (as string)
//   signature: signature to verify
// }
Json::Value doChannelVerify (RPC::Context& context)
{
    auto const& params (context.params);
    for (auto const& p :
        {jss::public_key, jss::channel_id, jss::amount, jss::signature})
        if (!params.isMember (p))
            return RPC::missing_field_error (p);

    std::string const strPk = params[jss::public_key].asString ();
    auto const pk =
        parseBase58<PublicKey> (TokenType::TOKEN_ACCOUNT_PUBLIC, strPk);
    if (!pk)
        return rpcError (rpcPUBLIC_MALFORMED);

    uint256 channelId;
    if (!channelId.SetHexExact (params[jss::channel_id].asString ()))
        return rpcError (rpcCHANNEL_MALFORMED);

    std::uint64_t drops = 0;
    try
    {
        drops = std::stoul (params[jss::amount].asString ());
    }
    catch (std::exception const&)
    {
        return rpcError (rpcCHANNEL_AMT_MALFORMED);
    }

    std::pair<Blob, bool> sig(strUnHex (params[jss::signature].asString ()));
    if (!sig.second || !sig.first.size ())
        return rpcError (rpcINVALID_PARAMS);

    Serializer msg;
    serializePayChanAuthorization (msg, channelId, XRPAmount (drops));

    Json::Value result;
    result[jss::signature_verified] =
        verify (*pk, msg.slice (), makeSlice (sig.first), /*canonical*/ true);
    return result;
}
示例#4
0
TER
SetTrust::doApply ()
{
    TER terResult = tesSUCCESS;

    STAmount const saLimitAmount (tx().getFieldAmount (sfLimitAmount));
    bool const bQualityIn (tx().isFieldPresent (sfQualityIn));
    bool const bQualityOut (tx().isFieldPresent (sfQualityOut));

    Currency const currency (saLimitAmount.getCurrency ());
    AccountID uDstAccountID (saLimitAmount.getIssuer ());

    // true, iff current is high account.
    bool const bHigh = account_ > uDstAccountID;

    auto const sle = view().peek(
        keylet::account(account_));

    std::uint32_t const uOwnerCount = sle->getFieldU32 (sfOwnerCount);

    // The reserve required to create the line. Note that we allow up to
    // two trust lines without requiring a reserve because being able to
    // exchange currencies is a powerful Ripple feature.
    //
    // This is also a security feature: if you're a gateway and you want to
    // be able to let someone use your services, you would otherwise have to
    // give them enough XRP to cover the incremental reserve for their trust
    // line. If they had no intention of using your services, they could use
    // the XRP for their own purposes. So we make it possible for gateways
    // to fund accounts in a way where there's no incentive to trick them
    // into creating an account you have no intention of using.

    XRPAmount const reserveCreate ((uOwnerCount < 2)
        ? XRPAmount (zero)
        : view().fees().accountReserve(uOwnerCount + 1));

    std::uint32_t uQualityIn (bQualityIn ? tx().getFieldU32 (sfQualityIn) : 0);
    std::uint32_t uQualityOut (bQualityOut ? tx().getFieldU32 (sfQualityOut) : 0);

    if (bQualityOut && QUALITY_ONE == uQualityOut)
        uQualityOut = 0;

    std::uint32_t const uTxFlags = tx().getFlags ();

    bool const bSetAuth = (uTxFlags & tfSetfAuth);
    bool const bSetNoRipple = (uTxFlags & tfSetNoRipple);
    bool const bClearNoRipple  = (uTxFlags & tfClearNoRipple);
    bool const bSetFreeze = (uTxFlags & tfSetFreeze);
    bool const bClearFreeze = (uTxFlags & tfClearFreeze);

    auto viewJ = ctx_.app.journal ("View");

    if (bSetAuth && !(sle->getFieldU32 (sfFlags) & lsfRequireAuth))
    {
        j_.trace <<
            "Retry: Auth not required.";
        return tefNO_AUTH_REQUIRED;
    }

    if (account_ == uDstAccountID)
    {
        // The only purpose here is to allow a mistakenly created
        // trust line to oneself to be deleted. If no such trust
        // lines exist now, why not remove this code and simply
        // return an error?
        SLE::pointer sleDelete = view().peek (
            keylet::line(account_, uDstAccountID, currency));

        if (sleDelete)
        {
            j_.warning <<
                "Clearing redundant line.";

            return trustDelete (view(),
                sleDelete, account_, uDstAccountID, viewJ);
        }
        else
        {
            j_.trace <<
                "Malformed transaction: Can not extend credit to self.";
            return temDST_IS_SRC;
        }
    }

    SLE::pointer sleDst =
        view().peek (keylet::account(uDstAccountID));

    if (!sleDst)
    {
        j_.trace <<
            "Delay transaction: Destination account does not exist.";
        return tecNO_DST;
    }

    STAmount saLimitAllow = saLimitAmount;
    saLimitAllow.setIssuer (account_);

    SLE::pointer sleRippleState = view().peek (
        keylet::line(account_, uDstAccountID, currency));

    if (sleRippleState)
    {
        STAmount        saLowBalance;
        STAmount        saLowLimit;
        STAmount        saHighBalance;
        STAmount        saHighLimit;
        std::uint32_t   uLowQualityIn;
        std::uint32_t   uLowQualityOut;
        std::uint32_t   uHighQualityIn;
        std::uint32_t   uHighQualityOut;
        auto const& uLowAccountID   = !bHigh ? account_ : uDstAccountID;
        auto const& uHighAccountID  =  bHigh ? account_ : uDstAccountID;
        SLE::ref        sleLowAccount   = !bHigh ? sle : sleDst;
        SLE::ref        sleHighAccount  =  bHigh ? sle : sleDst;

        //
        // Balances
        //

        saLowBalance    = sleRippleState->getFieldAmount (sfBalance);
        saHighBalance   = -saLowBalance;

        //
        // Limits
        //

        sleRippleState->setFieldAmount (!bHigh ? sfLowLimit : sfHighLimit, saLimitAllow);

        saLowLimit  = !bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfLowLimit);
        saHighLimit =  bHigh ? saLimitAllow : sleRippleState->getFieldAmount (sfHighLimit);

        //
        // Quality in
        //

        if (!bQualityIn)
        {
            // Not setting. Just get it.

            uLowQualityIn   = sleRippleState->getFieldU32 (sfLowQualityIn);
            uHighQualityIn  = sleRippleState->getFieldU32 (sfHighQualityIn);
        }
        else if (uQualityIn)
        {
            // Setting.

            sleRippleState->setFieldU32 (!bHigh ? sfLowQualityIn : sfHighQualityIn, uQualityIn);

            uLowQualityIn   = !bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfLowQualityIn);
            uHighQualityIn  =  bHigh ? uQualityIn : sleRippleState->getFieldU32 (sfHighQualityIn);
        }
        else
        {
            // Clearing.

            sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityIn : sfHighQualityIn);

            uLowQualityIn   = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityIn);
            uHighQualityIn  =  bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityIn);
        }

        if (QUALITY_ONE == uLowQualityIn)   uLowQualityIn   = 0;

        if (QUALITY_ONE == uHighQualityIn)  uHighQualityIn  = 0;

        //
        // Quality out
        //

        if (!bQualityOut)
        {
            // Not setting. Just get it.

            uLowQualityOut  = sleRippleState->getFieldU32 (sfLowQualityOut);
            uHighQualityOut = sleRippleState->getFieldU32 (sfHighQualityOut);
        }
        else if (uQualityOut)
        {
            // Setting.

            sleRippleState->setFieldU32 (!bHigh ? sfLowQualityOut : sfHighQualityOut, uQualityOut);

            uLowQualityOut  = !bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfLowQualityOut);
            uHighQualityOut =  bHigh ? uQualityOut : sleRippleState->getFieldU32 (sfHighQualityOut);
        }
        else
        {
            // Clearing.

            sleRippleState->makeFieldAbsent (!bHigh ? sfLowQualityOut : sfHighQualityOut);

            uLowQualityOut  = !bHigh ? 0 : sleRippleState->getFieldU32 (sfLowQualityOut);
            uHighQualityOut =  bHigh ? 0 : sleRippleState->getFieldU32 (sfHighQualityOut);
        }

        std::uint32_t const uFlagsIn (sleRippleState->getFieldU32 (sfFlags));
        std::uint32_t uFlagsOut (uFlagsIn);

        if (bSetNoRipple && !bClearNoRipple && (bHigh ? saHighBalance : saLowBalance) >= zero)
        {
            uFlagsOut |= (bHigh ? lsfHighNoRipple : lsfLowNoRipple);
        }
        else if (bClearNoRipple && !bSetNoRipple)
        {
            uFlagsOut &= ~(bHigh ? lsfHighNoRipple : lsfLowNoRipple);
        }

        if (bSetFreeze && !bClearFreeze && !sle->isFlag  (lsfNoFreeze))
        {
            uFlagsOut           |= (bHigh ? lsfHighFreeze : lsfLowFreeze);
        }
        else if (bClearFreeze && !bSetFreeze)
        {
            uFlagsOut           &= ~(bHigh ? lsfHighFreeze : lsfLowFreeze);
        }

        if (QUALITY_ONE == uLowQualityOut)  uLowQualityOut  = 0;

        if (QUALITY_ONE == uHighQualityOut) uHighQualityOut = 0;

        bool const bLowDefRipple        = sleLowAccount->getFlags() & lsfDefaultRipple;
        bool const bHighDefRipple       = sleHighAccount->getFlags() & lsfDefaultRipple;

        bool const  bLowReserveSet      = uLowQualityIn || uLowQualityOut ||
                                            ((uFlagsOut & lsfLowNoRipple) == 0) != bLowDefRipple ||
                                            (uFlagsOut & lsfLowFreeze) ||
                                            saLowLimit || saLowBalance > zero;
        bool const  bLowReserveClear    = !bLowReserveSet;

        bool const  bHighReserveSet     = uHighQualityIn || uHighQualityOut ||
                                            ((uFlagsOut & lsfHighNoRipple) == 0) != bHighDefRipple ||
                                            (uFlagsOut & lsfHighFreeze) ||
                                            saHighLimit || saHighBalance > zero;
        bool const  bHighReserveClear   = !bHighReserveSet;

        bool const  bDefault            = bLowReserveClear && bHighReserveClear;

        bool const  bLowReserved = (uFlagsIn & lsfLowReserve);
        bool const  bHighReserved = (uFlagsIn & lsfHighReserve);

        bool        bReserveIncrease    = false;

        if (bSetAuth)
        {
            uFlagsOut |= (bHigh ? lsfHighAuth : lsfLowAuth);
        }

        if (bLowReserveSet && !bLowReserved)
        {
            // Set reserve for low account.
            adjustOwnerCount(view(),
                sleLowAccount, 1, viewJ);
            uFlagsOut |= lsfLowReserve;

            if (!bHigh)
                bReserveIncrease = true;
        }

        if (bLowReserveClear && bLowReserved)
        {
            // Clear reserve for low account.
            adjustOwnerCount(view(),
                sleLowAccount, -1, viewJ);
            uFlagsOut &= ~lsfLowReserve;
        }

        if (bHighReserveSet && !bHighReserved)
        {
            // Set reserve for high account.
            adjustOwnerCount(view(),
                sleHighAccount, 1, viewJ);
            uFlagsOut |= lsfHighReserve;

            if (bHigh)
                bReserveIncrease    = true;
        }

        if (bHighReserveClear && bHighReserved)
        {
            // Clear reserve for high account.
            adjustOwnerCount(view(),
                sleHighAccount, -1, viewJ);
            uFlagsOut &= ~lsfHighReserve;
        }

        if (uFlagsIn != uFlagsOut)
            sleRippleState->setFieldU32 (sfFlags, uFlagsOut);

        if (bDefault || badCurrency() == currency)
        {
            // Delete.

            terResult = trustDelete (view(),
                sleRippleState, uLowAccountID, uHighAccountID, viewJ);
        }
        // Reserve is not scaled by load.
        else if (bReserveIncrease && mPriorBalance < reserveCreate)
        {
            j_.trace <<
                "Delay transaction: Insufficent reserve to add trust line.";

            // Another transaction could provide XRP to the account and then
            // this transaction would succeed.
            terResult = tecINSUF_RESERVE_LINE;
        }
        else
        {
            view().update (sleRippleState);

            j_.trace << "Modify ripple line";
        }
    }
    // Line does not exist.
    else if (! saLimitAmount &&                          // Setting default limit.
        (! bQualityIn || ! uQualityIn) &&           // Not setting quality in or setting default quality in.
        (! bQualityOut || ! uQualityOut) &&         // Not setting quality out or setting default quality out.
        (! ((view().flags() & tapENABLE_TESTING) ||
            view().rules().enabled(featureTrustSetAuth,
                ctx_.config.features)) || ! bSetAuth))
    {
        j_.trace <<
            "Redundant: Setting non-existent ripple line to defaults.";
        return tecNO_LINE_REDUNDANT;
    }
    else if (mPriorBalance < reserveCreate) // Reserve is not scaled by load.
    {
        j_.trace <<
            "Delay transaction: Line does not exist. Insufficent reserve to create line.";

        // Another transaction could create the account and then this transaction would succeed.
        terResult = tecNO_LINE_INSUF_RESERVE;
    }
    else
    {
        // Zero balance in currency.
        STAmount saBalance ({currency, noAccount()});

        uint256 index (getRippleStateIndex (
            account_, uDstAccountID, currency));

        j_.trace <<
            "doTrustSet: Creating ripple line: " <<
            to_string (index);

        // Create a new ripple line.
        terResult = trustCreate (view(),
            bHigh,
            account_,
            uDstAccountID,
            index,
            sle,
            bSetAuth,
            bSetNoRipple && !bClearNoRipple,
            bSetFreeze && !bClearFreeze,
            saBalance,
            saLimitAllow,       // Limit for who is being charged.
            uQualityIn,
            uQualityOut, viewJ);
    }

    return terResult;
}