add second instance

parachains/runtimes/assets/westmint/src/lib.rs

@@ -63,7 +63,9 @@ use parachains_common::{
 	opaque, AccountId, AssetId, AuraId, Balance, BlockNumber, Hash, Header, Index, Signature,
 	AVERAGE_ON_INITIALIZE_RATIO, HOURS, MAXIMUM_BLOCK_WEIGHT, NORMAL_DISPATCH_RATIO, SLOT_DURATION,
 };
-use xcm_config::{XcmConfig, XcmOriginToTransactDispatchOrigin};
+use xcm_config::{
+	ForeignCreators, MultiLocationForAssetId, XcmConfig, XcmOriginToTransactDispatchOrigin,
+};
 
 #[cfg(any(feature = "std", test))]
 pub use sp_runtime::BuildStorage;
@@ -244,6 +246,27 @@ impl pallet_assets::Config<TrustBackedAssetClasses> for Runtime {
 	type AssetAccountDeposit = AssetAccountDeposit;
 }
 
+/// Assets managed by some foreign location.
+type ForeignAssetClasses = pallet_assets::Instance2;
+impl pallet_assets::Config<ForeignAssetClasses> for Runtime {
+	type RuntimeEvent = RuntimeEvent;
+	type Balance = Balance;
+	type AssetId = MultiLocationForAssetId;
+	type Currency = Balances;
+	type CreateOrigin = ForeignCreators;
+	type ForceOrigin = AssetsForceOrigin;
+	type AssetDeposit = AssetDeposit;
+	type MetadataDepositBase = MetadataDepositBase;
+	type MetadataDepositPerByte = MetadataDepositPerByte;
+	type ApprovalDeposit = ApprovalDeposit;
+	type StringLimit = AssetsStringLimit;
+	type Freezer = ();
+	type Extra = ();
+	type WeightInfo = weights::pallet_assets::WeightInfo<Runtime>;
+	type AssetAccountDeposit = AssetAccountDeposit;
+	type RemoveItemsLimit = frame_support::traits::ConstU32<1000>;
+}
+
 parameter_types! {
 	// One storage item; key size is 32; value is size 4+4+16+32 bytes = 56 bytes.
 	pub const DepositBase: Balance = deposit(1, 88);
@@ -514,9 +537,12 @@ impl pallet_asset_tx_payment::Config for Runtime {
 	type RuntimeEvent = RuntimeEvent;
 	// TODO
 	// This should be able to take assets from any pallet instance.
-	type Fungibles = TrustBackedAssets;
+	type Fungibles = (ForeignAssets, TrustBackedAssets);
 	type OnChargeAssetTransaction = pallet_asset_tx_payment::FungiblesAdapter<
-		pallet_assets::BalanceToAssetBalance<Balances, Runtime, ConvertInto>,
+		(
+			ForeignAssets::BalanceToAssetBalance<Balances, Runtime, ConvertInto>,
+			TrustBackedAssets::BalanceToAssetBalance<Balances, Runtime, ConvertInto>,
+		),
 		AssetsToBlockAuthor<Runtime>,
 	>;
 }
@@ -595,6 +621,7 @@ construct_runtime!(
 		// The main stage.
 		TrustBackedAssets: pallet_assets::<Instance1>::{Pallet, Call, Storage, Event<T>} = 50,
 		Uniques: pallet_uniques::{Pallet, Call, Storage, Event<T>} = 51,
+		ForeignAssets: pallet_assets::<Instance2>::{Pallet, Call, Storage, Event<T>} = 52,
 	}
 );
 
@@ -644,6 +671,7 @@ mod benches {
 	define_benchmarks!(
 		[frame_system, SystemBench::<Runtime>]
 		[pallet_assets, TrustBackedAssets]
+		[pallet_assets, ForeignAssets]
 		[pallet_balances, Balances]
 		[pallet_multisig, Multisig]
 		[pallet_proxy, Proxy]

parachains/runtimes/assets/westmint/src/xcm_config.rs

@@ -23,6 +23,7 @@ use super::{
 use frame_support::{
 	match_types, parameter_types,
 	traits::{ConstU32, Everything, Nothing, PalletInfoAccess},
+	traits::{EnsureOriginWithArg, Everything, PalletInfoAccess},
 };
 use pallet_xcm::XcmPassthrough;
 use parachains_common::{
@@ -31,7 +32,7 @@ use parachains_common::{
 		AssetFeeAsExistentialDepositMultiplier, DenyReserveTransferToRelayChain, DenyThenTry,
 	},
 };
-use polkadot_parachain::primitives::Sibling;
+use polkadot_parachain::primitives::{Id as ParaId, Sibling};
 use sp_runtime::traits::ConvertInto;
 use xcm::latest::prelude::*;
 use xcm_builder::{
@@ -253,3 +254,34 @@ impl cumulus_pallet_xcm::Config for Runtime {
 	type RuntimeEvent = RuntimeEvent;
 	type XcmExecutor = XcmExecutor<XcmConfig>;
 }
+
+pub type MultiLocationForAssetId = MultiLocation;
+
+pub type SovereignAccountOf = (
+	SiblingParachainConvertsVia<ParaId, AccountId>,
+	AccountId32Aliases<RelayNetwork, AccountId>,
+	ParentIsPreset<AccountId>,
+);
+
+// `EnsureOriginWithArg` impl for `CreateOrigin` which allows only XCM origins that are locations
+// containing the class location.
+pub struct ForeignCreators;
+impl EnsureOriginWithArg<RuntimeOrigin, MultiLocation> for ForeignCreators {
+	type Success = AccountId;
+
+	fn try_origin(
+		o: RuntimeOrigin,
+		a: &MultiLocation,
+	) -> sp_std::result::Result<Self::Success, RuntimeOrigin> {
+		let origin_location = pallet_xcm::EnsureXcm::<Everything>::try_origin(o.clone())?;
+		if !a.starts_with(&origin_location) {
+			return Err(o)
+		}
+		SovereignAccountOf::convert(origin_location).map_err(|_| o)
+	}
+
+	#[cfg(feature = "runtime-benchmarks")]
+	fn successful_origin(a: &MultiLocation) -> RuntimeOrigin {
+		pallet_xcm::Origin::Xcm(a.clone()).into()
+	}
+}