Add Support for Foreign Assets

parachains/common/src/impls.rs

@@ -95,6 +95,18 @@ where
 	}
 }
 
+/// Allow checking in assets that exists.
+pub struct AssetExists<AccountId, Assets>(PhantomData<(AccountId, Assets)>);
+impl<AccountId, Assets> Contains<<Assets as fungibles::Inspect<AccountId>>::AssetId>
+	for AssetExists<AccountId, Assets>
+where
+	Assets: fungibles::Inspect<AccountId>,
+{
+	fn contains(id: &<Assets as fungibles::Inspect<AccountId>>::AssetId) -> bool {
+		Assets::asset_exists(*id)
+	}
+}
+
 /// Asset filter that allows all assets from a certain location.
 pub struct AssetsFrom<T>(PhantomData<T>);
 impl<T: Get<MultiLocation>> ContainsPair<MultiAsset, MultiLocation> for AssetsFrom<T> {

parachains/runtimes/assets/common/Cargo.toml

@@ -7,19 +7,22 @@ description = "Assets common utilities"
 
 [dependencies]
 codec = { package = "parity-scale-codec", version = "3.0.0", default-features = false, features = ["derive"] }
+log = { version = "0.4.17", default-features = false }
 
 # Substrate
 frame-support = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 sp-api = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 sp-std = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 
 # Polkadot
+pallet-xcm = { git = "https://github.com/paritytech/polkadot", default-features = false, branch = "master" }
 xcm = { git = "https://github.com/paritytech/polkadot", default-features = false, branch = "master" }
 xcm-builder = { git = "https://github.com/paritytech/polkadot", default-features = false, branch = "master" }
 xcm-executor = { git = "https://github.com/paritytech/polkadot", default-features = false, branch = "master" }
 
 # Cumulus
 parachains-common = { path = "../../../common", default-features = false }
+cumulus-primitives-core = { path = "../../../../primitives/core", default-features = false }
 
 [build-dependencies]
 substrate-wasm-builder = { git = "https://github.com/paritytech/substrate", branch = "master" }
@@ -28,11 +31,20 @@ substrate-wasm-builder = { git = "https://github.com/paritytech/substrate", bran
 default = [ "std" ]
 std = [
 	"codec/std",
+	"log/std",
 	"frame-support/std",
 	"parachains-common/std",
+	"cumulus-primitives-core/std",
 	"sp-api/std",
 	"sp-std/std",
+	"pallet-xcm/std",
 	"xcm/std",
 	"xcm-builder/std",
 	"xcm-executor/std",
 ]
+
+runtime-benchmarks = [
+	"frame-support/runtime-benchmarks",
+	"pallet-xcm/runtime-benchmarks",
+	"xcm-builder/runtime-benchmarks",
+]

parachains/runtimes/assets/common/src/foreign_creators.rs

@@ -0,0 +1,56 @@
+// Copyright (C) 2023 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use frame_support::traits::{
+	ContainsPair, EnsureOrigin, EnsureOriginWithArg, Everything, OriginTrait,
+};
+use pallet_xcm::{EnsureXcm, Origin as XcmOrigin};
+use xcm::latest::MultiLocation;
+use xcm_executor::traits::Convert;
+
+// `EnsureOriginWithArg` impl for `CreateOrigin` that allows only XCM origins that are locations
+// containing the class location.
+pub struct ForeignCreators<IsForeign, AccountOf, AccountId>(
+	sp_std::marker::PhantomData<(IsForeign, AccountOf, AccountId)>,
+);
+impl<
+		IsForeign: ContainsPair<MultiLocation, MultiLocation>,
+		AccountOf: Convert<MultiLocation, AccountId>,
+		AccountId: Clone,
+		RuntimeOrigin: From<XcmOrigin> + OriginTrait + Clone,
+	> EnsureOriginWithArg<RuntimeOrigin, MultiLocation>
+	for ForeignCreators<IsForeign, AccountOf, AccountId>
+where
+	RuntimeOrigin::PalletsOrigin:
+		From<XcmOrigin> + TryInto<XcmOrigin, Error = RuntimeOrigin::PalletsOrigin>,
+{
+	type Success = AccountId;
+
+	fn try_origin(
+		origin: RuntimeOrigin,
+		asset_location: &MultiLocation,
+	) -> sp_std::result::Result<Self::Success, RuntimeOrigin> {
+		let origin_location = EnsureXcm::<Everything>::try_origin(origin.clone())?;
+		if !IsForeign::contains(&asset_location, &origin_location) {
+			return Err(origin)
+		}
+		AccountOf::convert(origin_location).map_err(|_| origin)
+	}
+
+	#[cfg(feature = "runtime-benchmarks")]
+	fn try_successful_origin(a: &MultiLocation) -> Result<RuntimeOrigin, ()> {
+		Ok(pallet_xcm::Origin::Xcm(a.clone()).into())
+	}
+}

parachains/runtimes/assets/common/src/fungible_conversion.rs

@@ -1,27 +1,25 @@
-// This file is part of Substrate.
-
-// Copyright (C) 2018-2022 Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
-
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <https://www.gnu.org/licenses/>.
+// Copyright (C) 2023 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 //! Runtime API definition for assets.
 
 use crate::runtime_api::FungiblesAccessError;
+use frame_support::traits::Contains;
 use sp_std::{borrow::Borrow, vec::Vec};
 use xcm::latest::{MultiAsset, MultiLocation};
-use xcm_builder::ConvertedConcreteId;
+use xcm_builder::{ConvertedConcreteId, MatchedConvertedConcreteId};
 use xcm_executor::traits::{Convert, MatchesFungibles};
 
 /// Converting any [`(AssetId, Balance)`] to [`MultiAsset`]
@@ -60,6 +58,29 @@ impl<
 	}
 }
 
+impl<
+		AssetId: Clone,
+		Balance: Clone,
+		MatchAssetId: Contains<MultiLocation>,
+		ConvertAssetId: Convert<MultiLocation, AssetId>,
+		ConvertBalance: Convert<u128, Balance>,
+	> MultiAssetConverter<AssetId, Balance, ConvertAssetId, ConvertBalance>
+	for MatchedConvertedConcreteId<AssetId, Balance, MatchAssetId, ConvertAssetId, ConvertBalance>
+{
+	fn convert_ref(
+		value: impl Borrow<(AssetId, Balance)>,
+	) -> Result<MultiAsset, FungiblesAccessError> {
+		let (asset_id, balance) = value.borrow();
+		match ConvertAssetId::reverse_ref(asset_id) {
+			Ok(asset_id_as_multilocation) => match ConvertBalance::reverse_ref(balance) {
+				Ok(amount) => Ok((asset_id_as_multilocation, amount).into()),
+				Err(_) => Err(FungiblesAccessError::AmountToBalanceConversionFailed),
+			},
+			Err(_) => Err(FungiblesAccessError::AssetIdConversionFailed),
+		}
+	}
+}
+
 /// Helper function to convert collections with [`(AssetId, Balance)`] to [`MultiAsset`]
 pub fn convert<'a, AssetId, Balance, ConvertAssetId, ConvertBalance, Converter>(
 	items: impl Iterator<Item = &'a (AssetId, Balance)>,
@@ -90,11 +111,12 @@ pub fn convert_balance<
 #[cfg(test)]
 mod tests {
 	use super::*;
+	use frame_support::traits::Everything;
 
 	use xcm::latest::prelude::*;
 	use xcm_executor::traits::{Identity, JustTry};
 
-	type Converter = ConvertedConcreteId<MultiLocation, u64, Identity, JustTry>;
+	type Converter = MatchedConvertedConcreteId<MultiLocation, u64, Everything, Identity, JustTry>;
 
 	#[test]
 	fn converted_concrete_id_fungible_multi_asset_conversion_roundtrip_works() {