Support DOT reseve on AH and Snowfork bridged assets

runtime/acala/src/xcm_config.rs

@@ -40,13 +40,14 @@ use parity_scale_codec::{Decode, Encode};
 use polkadot_runtime_common::xcm_sender::NoPriceForMessageDelivery;
 use primitives::evm::is_system_contract;
 use runtime_common::{
-	local_currency_location, native_currency_location, AcalaDropAssets, EnsureRootOrHalfGeneralCouncil,
+	local_currency_location, native_currency_location, xcm_config::RelayLocationFilter,
+	xcm_impl::IsBridgedConcreteAssetFrom, AcalaDropAssets, EnsureRootOrHalfGeneralCouncil,
 	EnsureRootOrThreeFourthsGeneralCouncil, FixedRateOfAsset, RuntimeBlockWeights,
 };
 use sp_runtime::Perbill;
 use xcm::{prelude::*, v3::Weight as XcmWeight};
 use xcm_builder::{
-	EnsureXcmOrigin, FixedRateOfFungible, FixedWeightBounds, FrameTransactionalProcessor, SignedToAccountId32,
+	Case, EnsureXcmOrigin, FixedRateOfFungible, FixedWeightBounds, FrameTransactionalProcessor, SignedToAccountId32,
 };
 
 parameter_types! {
@@ -94,8 +95,24 @@ parameter_types! {
 		0
 	);
 	pub BaseRate: u128 = aca_per_second();
+
+	/// Location of Asset Hub
+	 pub AssetHubLocation: Location = Location::new(1, [Parachain(1000)]);
+	 pub RelayChainNativeAssetFromAssetHub: (AssetFilter, Location) = (
+		 RelayLocationFilter::get(),
+		 AssetHubLocation::get()
+	 );
 }
 
+type Reserves = (
+	// Assets bridged from different consensus systems held in reserve on Asset Hub.
+	IsBridgedConcreteAssetFrom<AssetHubLocation>,
+	// Relaychain (DOT) from Asset Hub
+	Case<RelayChainNativeAssetFromAssetHub>,
+	// Assets which the reserve is the same as the origin.
+	MultiNativeAsset<AbsoluteReserveProvider>,
+);
+
 pub type Trader = (
 	FixedRateOfAsset<BaseRate, ToTreasury, BuyWeightRateOfTransactionFeePool<Runtime, CurrencyIdConvert>>,
 	FixedRateOfFungible<AcaPerSecond, ToTreasury>,
@@ -115,7 +132,7 @@ impl xcm_executor::Config for XcmConfig {
 	// How to withdraw and deposit an asset.
 	type AssetTransactor = LocalAssetTransactor;
 	type OriginConverter = XcmOriginToCallOrigin;
-	type IsReserve = MultiNativeAsset<AbsoluteReserveProvider>;
+	type IsReserve = Reserves;
 	type IsTeleporter = runtime_common::xcm_config::TrustedTeleporters;
 	type UniversalLocation = UniversalLocation;
 	type Barrier = Barrier;

runtime/common/src/xcm_config.rs

@@ -127,6 +127,10 @@ impl Convert<AccountId, Location> for AccountIdToLocation {
 
 parameter_types! {
 	pub const RelayLocation: Location = Location::parent();
+	pub RelayLocationFilter: AssetFilter = Wild(AllOf {
+		fun: WildFungible,
+		id: xcm::prelude::AssetId(RelayLocation::get()),
+	});
 }
 
 // define assets that can be trusted to teleport by remotes

runtime/common/src/xcm_impl.rs

@@ -18,7 +18,10 @@
 
 //! Common xcm implementation
 
-use frame_support::{traits::Get, weights::constants::WEIGHT_REF_TIME_PER_SECOND};
+use frame_support::{
+	traits::{ContainsPair, Get},
+	weights::constants::WEIGHT_REF_TIME_PER_SECOND,
+};
 use module_support::BuyWeightRate;
 use orml_traits::GetByKey;
 use parity_scale_codec::Encode;
@@ -295,6 +298,26 @@ where
 	}
 }
 
+/// Matches foreign assets from a given origin.
+/// Foreign assets are assets bridged from other consensus systems. i.e parents > 1.
+pub struct IsBridgedConcreteAssetFrom<Origin>(PhantomData<Origin>);
+impl<Origin> ContainsPair<Asset, Location> for IsBridgedConcreteAssetFrom<Origin>
+where
+	Origin: Get<Location>,
+{
+	fn contains(asset: &Asset, origin: &Location) -> bool {
+		let loc = Origin::get();
+		&loc == origin
+			&& matches!(
+				asset,
+				Asset {
+					id: AssetId(Location { parents: 2, .. }),
+					fun: Fungibility::Fungible(_)
+				},
+			)
+	}
+}
+
 #[cfg(test)]
 mod tests {
 	use super::*;

runtime/karura/src/xcm_config.rs

@@ -38,13 +38,14 @@ use parity_scale_codec::{Decode, Encode};
 use polkadot_runtime_common::xcm_sender::NoPriceForMessageDelivery;
 use primitives::evm::is_system_contract;
 use runtime_common::{
-	local_currency_location, native_currency_location, AcalaDropAssets, EnsureRootOrHalfGeneralCouncil,
+	local_currency_location, native_currency_location, xcm_config::RelayLocationFilter,
+	xcm_impl::IsBridgedConcreteAssetFrom, AcalaDropAssets, EnsureRootOrHalfGeneralCouncil,
 	EnsureRootOrThreeFourthsGeneralCouncil, FixedRateOfAsset, RuntimeBlockWeights,
 };
 use sp_runtime::Perbill;
 use xcm::{prelude::*, v3::Weight as XcmWeight};
 use xcm_builder::{
-	EnsureXcmOrigin, FixedRateOfFungible, FixedWeightBounds, FrameTransactionalProcessor, SignedToAccountId32,
+	Case, EnsureXcmOrigin, FixedRateOfFungible, FixedWeightBounds, FrameTransactionalProcessor, SignedToAccountId32,
 };
 
 parameter_types! {
@@ -136,8 +137,24 @@ parameter_types! {
 	);
 
 	pub BaseRate: u128 = kar_per_second();
+
+		/// Location of Asset Hub
+		pub AssetHubLocation: Location = Location::new(1, [Parachain(1000)]);
+		pub RelayChainNativeAssetFromAssetHub: (AssetFilter, Location) = (
+			RelayLocationFilter::get(),
+			AssetHubLocation::get()
+		);
 }
 
+type Reserves = (
+	// Assets bridged from different consensus systems held in reserve on Asset Hub.
+	IsBridgedConcreteAssetFrom<AssetHubLocation>,
+	// Relaychain (DOT) from Asset Hub
+	Case<RelayChainNativeAssetFromAssetHub>,
+	// Assets which the reserve is the same as the origin.
+	MultiNativeAsset<AbsoluteReserveProvider>,
+);
+
 pub type Trader = (
 	FixedRateOfAsset<BaseRate, ToTreasury, BuyWeightRateOfTransactionFeePool<Runtime, CurrencyIdConvert>>,
 	FixedRateOfFungible<KarPerSecond, ToTreasury>,
@@ -162,7 +179,7 @@ impl xcm_executor::Config for XcmConfig {
 	// How to withdraw and deposit an asset.
 	type AssetTransactor = LocalAssetTransactor;
 	type OriginConverter = XcmOriginToCallOrigin;
-	type IsReserve = MultiNativeAsset<AbsoluteReserveProvider>;
+	type IsReserve = Reserves;
 	type IsTeleporter = runtime_common::xcm_config::TrustedTeleporters;
 	type UniversalLocation = UniversalLocation;
 	type Barrier = Barrier;