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[Amendment] If you set a destination on an NFT offer, only that destination can settle through brokerage (fix #4373) #4399

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merged 5 commits into from
Feb 13, 2023
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[Amendment] If you set a destination on an NFT offer, only that destination can settle through brokerage (fix #4373) #4399

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b7e9f3e
fixNFTokenBrokerAccept
dangell7 Jan 2, 2023
723f15c
refactor
dangell7 Feb 13, 2023
5cfdcd7
remove feature test set
dangell7 Feb 13, 2023
f519f90
clean comments
dangell7 Feb 13, 2023
7cadd0c
clang-format
dangell7 Feb 13, 2023
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36 changes: 28 additions & 8 deletions src/ripple/app/tx/impl/NFTokenAcceptOffer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -112,20 +112,40 @@ NFTokenAcceptOffer::preclaim(PreclaimContext const& ctx)
if ((*so)[sfAmount] > (*bo)[sfAmount])
return tecINSUFFICIENT_PAYMENT;

// If the buyer specified a destination, that destination must be
// the seller or the broker.
// If the buyer specified a destination
if (auto const dest = bo->at(~sfDestination))
{
if (*dest != so->at(sfOwner) && *dest != ctx.tx[sfAccount])
return tecNFTOKEN_BUY_SELL_MISMATCH;
// fixUnburnableNFToken
if (ctx.view.rules().enabled(fixUnburnableNFToken))
{
// the destination may only be the account brokering the offer
if (*dest != ctx.tx[sfAccount])
return tecNO_PERMISSION;
}
else
{
// the destination must be the seller or the broker.
if (*dest != so->at(sfOwner) && *dest != ctx.tx[sfAccount])
return tecNFTOKEN_BUY_SELL_MISMATCH;
}
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it's not a blocker, but you are checking the rule twice when you could check it just once with some conditional re-ordering

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@dangell7 dangell7 Feb 13, 2023 •
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I refactored this if you want to check it out.

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it's better looking to me! this is fine for merge, but IMO I would do this to remove a level of indentation:

if (ctx.view.rules().enabled(fixUnburnableNFToken))
{
  if (*dest != ctx.tx[sfAccount])
    return tecNO_PERMISSION;
}
else if (*dest != so->at(sfOwner) && *dest != ctx.tx[sfAccount])
  return tecNFTOKEN_BUY_SELL_MISMATCH;

}

// If the seller specified a destination, that destination must be
// the buyer or the broker.
// If the seller specified a destination
if (auto const dest = so->at(~sfDestination))
{
if (*dest != bo->at(sfOwner) && *dest != ctx.tx[sfAccount])
return tecNFTOKEN_BUY_SELL_MISMATCH;
// fixUnburnableNFToken
if (ctx.view.rules().enabled(fixUnburnableNFToken))
{
// the destination may only be the account brokering the offer
if (*dest != ctx.tx[sfAccount])
return tecNO_PERMISSION;
}
else
{
// the destination must be the buyer or the broker.
if (*dest != bo->at(sfOwner) && *dest != ctx.tx[sfAccount])
return tecNFTOKEN_BUY_SELL_MISMATCH;
}
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ditto

}

// The broker can specify an amount that represents their cut; if they
Expand Down
3 changes: 2 additions & 1 deletion src/ripple/protocol/Feature.h
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Expand Up @@ -74,7 +74,7 @@ namespace detail {
// Feature.cpp. Because it's only used to reserve storage, and determine how
// large to make the FeatureBitset, it MAY be larger. It MUST NOT be less than
// the actual number of amendments. A LogicError on startup will verify this.
static constexpr std::size_t numFeatures = 54;
static constexpr std::size_t numFeatures = 55;
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/** Amendments that this server supports and the default voting behavior.
Whether they are enabled depends on the Rules defined in the validated
Expand Down Expand Up @@ -341,6 +341,7 @@ extern uint256 const fixTrustLinesToSelf;
extern uint256 const fixRemoveNFTokenAutoTrustLine;
extern uint256 const featureImmediateOfferKilled;
extern uint256 const featureDisallowIncoming;
extern uint256 const fixUnburnableNFToken;

} // namespace ripple

Expand Down
1 change: 1 addition & 0 deletions src/ripple/protocol/impl/Feature.cpp
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Expand Up @@ -451,6 +451,7 @@ REGISTER_FIX (fixTrustLinesToSelf, Supported::yes, DefaultVote::no)
REGISTER_FIX (fixRemoveNFTokenAutoTrustLine, Supported::yes, DefaultVote::yes);
REGISTER_FEATURE(ImmediateOfferKilled, Supported::yes, DefaultVote::no);
REGISTER_FEATURE(DisallowIncoming, Supported::yes, DefaultVote::no);
REGISTER_FIX (fixUnburnableNFToken, Supported::yes, DefaultVote::no);

// The following amendments have been active for at least two years. Their
// pre-amendment code has been removed and the identifiers are deprecated.
Expand Down
113 changes: 73 additions & 40 deletions src/test/app/NFToken_test.cpp
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Expand Up @@ -2872,15 +2872,20 @@ class NFToken_test : public beast::unit_test::suite
BEAST_EXPECT(ownerCount(env, minter) == 2);
BEAST_EXPECT(ownerCount(env, buyer) == 1);

// issuer cannot broker the offers, because they are not the
// Destination.
env(token::brokerOffers(
issuer, offerBuyerToMinter, offerMinterToBroker),
ter(tecNFTOKEN_BUY_SELL_MISMATCH));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 0);
BEAST_EXPECT(ownerCount(env, minter) == 2);
BEAST_EXPECT(ownerCount(env, buyer) == 1);
{
// issuer cannot broker the offers, because they are not the
// Destination.
TER const expectTer = features[fixUnburnableNFToken]
? tecNO_PERMISSION
: tecNFTOKEN_BUY_SELL_MISMATCH;
env(token::brokerOffers(
issuer, offerBuyerToMinter, offerMinterToBroker),
ter(expectTer));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 0);
BEAST_EXPECT(ownerCount(env, minter) == 2);
BEAST_EXPECT(ownerCount(env, buyer) == 1);
}

// Since broker is the sell offer's destination, they can broker
// the two offers.
Expand Down Expand Up @@ -2917,29 +2922,52 @@ class NFToken_test : public beast::unit_test::suite
BEAST_EXPECT(ownerCount(env, minter) == 1);
BEAST_EXPECT(ownerCount(env, buyer) == 2);

// Cannot broker offers when the sell destination is not the buyer.
env(token::brokerOffers(
broker, offerIssuerToBuyer, offerBuyerToMinter),
ter(tecNFTOKEN_BUY_SELL_MISMATCH));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 1);
BEAST_EXPECT(ownerCount(env, minter) == 1);
BEAST_EXPECT(ownerCount(env, buyer) == 2);
{
// Cannot broker offers when the sell destination is not the
// buyer.
TER const expectTer = features[fixUnburnableNFToken]
? tecNO_PERMISSION
: tecNFTOKEN_BUY_SELL_MISMATCH;
env(token::brokerOffers(
broker, offerIssuerToBuyer, offerBuyerToMinter),
ter(expectTer));
env.close();

// Broker is successful when destination is buyer.
env(token::brokerOffers(
broker, offerMinterToBuyer, offerBuyerToMinter));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 1);
BEAST_EXPECT(ownerCount(env, minter) == 1);
BEAST_EXPECT(ownerCount(env, buyer) == 0);
BEAST_EXPECT(ownerCount(env, issuer) == 1);
BEAST_EXPECT(ownerCount(env, minter) == 1);
BEAST_EXPECT(ownerCount(env, buyer) == 2);

// Clean out the unconsumed offer.
env(token::cancelOffer(issuer, {offerIssuerToBuyer}));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 0);
BEAST_EXPECT(ownerCount(env, minter) == 1);
BEAST_EXPECT(ownerCount(env, buyer) == 0);
// amendment switch: When enabled the broker fails, when
// disabled the broker succeeds if the destination is the buyer.
TER const eexpectTer = features[fixUnburnableNFToken]
? tecNO_PERMISSION
: TER(tesSUCCESS);
env(token::brokerOffers(
broker, offerMinterToBuyer, offerBuyerToMinter),
ter(eexpectTer));
env.close();

if (features[fixUnburnableNFToken])
// Buyer is successful with acceptOffer.
env(token::acceptBuyOffer(buyer, offerMinterToBuyer));
env.close();

// Clean out the unconsumed offer.
env(token::cancelOffer(buyer, {offerBuyerToMinter}));
env.close();

BEAST_EXPECT(ownerCount(env, issuer) == 1);
BEAST_EXPECT(ownerCount(env, minter) == 1);
BEAST_EXPECT(ownerCount(env, buyer) == 0);

// Clean out the unconsumed offer.
env(token::cancelOffer(issuer, {offerIssuerToBuyer}));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 0);
BEAST_EXPECT(ownerCount(env, minter) == 1);
BEAST_EXPECT(ownerCount(env, buyer) == 0);
return;
}
}

// Show that if a buy and a sell offer both have the same destination,
Expand All @@ -2957,15 +2985,20 @@ class NFToken_test : public beast::unit_test::suite
token::owner(minter),
token::destination(broker));

// Cannot broker offers when the sell destination is not the buyer
// or the broker.
env(token::brokerOffers(
issuer, offerBuyerToBroker, offerMinterToBroker),
ter(tecNFTOKEN_BUY_SELL_MISMATCH));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 0);
BEAST_EXPECT(ownerCount(env, minter) == 2);
BEAST_EXPECT(ownerCount(env, buyer) == 1);
{
// Cannot broker offers when the sell destination is not the
// buyer or the broker.
TER const expectTer = features[fixUnburnableNFToken]
? tecNO_PERMISSION
: tecNFTOKEN_BUY_SELL_MISMATCH;
env(token::brokerOffers(
issuer, offerBuyerToBroker, offerMinterToBroker),
ter(expectTer));
env.close();
BEAST_EXPECT(ownerCount(env, issuer) == 0);
BEAST_EXPECT(ownerCount(env, minter) == 2);
BEAST_EXPECT(ownerCount(env, buyer) == 1);
}

// Broker is successful if they are the destination of both offers.
env(token::brokerOffers(
Expand Down Expand Up @@ -5088,4 +5121,4 @@ class NFToken_test : public beast::unit_test::suite

BEAST_DEFINE_TESTSUITE_PRIO(NFToken, tx, ripple, 2);

} // namespace ripple
} // namespace ripple
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missing a newline but not a blocker