git.delta.rocks / unique-network / refs/commits / 9d0fd83a5da6

1// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.2// This file is part of Unique Network.34// Unique Network is free software: you can redistribute it and/or modify5// it under the terms of the GNU General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.89// Unique Network is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the12// GNU General Public License for more details.1314// You should have received a copy of the GNU General Public License15// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.1617//! # Foreign Assets18//!19//! ## Overview20//!21//! The Foreign Assets is a proxy that maps XCM operations to the Unique Network's pallets logic.2223#![cfg_attr(not(feature = "std"), no_std)]24#![allow(clippy::unused_unit)]2526use core::ops::Deref;2728use frame_support::{dispatch::DispatchResult, pallet_prelude::*, traits::EnsureOrigin, PalletId};29use frame_system::pallet_prelude::*;30use pallet_common::{31	dispatch::CollectionDispatch, erc::CrossAccountId, XcmExtensions, NATIVE_FUNGIBLE_COLLECTION_ID,32};33use sp_runtime::traits::AccountIdConversion;34use sp_std::{boxed::Box, vec, vec::Vec};35use staging_xcm::{36	opaque::latest::{prelude::XcmError, Weight},37	v3::{prelude::*, MultiAsset, XcmContext},38};39use staging_xcm_executor::{40	traits::{ConvertLocation, Error as XcmExecutorError, TransactAsset, WeightTrader},41	Assets,42};43use up_data_structs::{44	budget::ZeroBudget, CollectionId, CollectionMode, CollectionName, CollectionTokenPrefix,45	CreateCollectionData, CreateFungibleData, CreateItemData, CreateNftData, Property, PropertyKey,46	TokenId,47};4849pub mod weights;5051#[cfg(feature = "runtime-benchmarks")]52mod benchmarking;5354pub use module::*;55pub use weights::WeightInfo;5657#[frame_support::pallet]58pub mod module {59	use up_data_structs::{60		CollectionDescription, Property, PropertyKeyPermission, PropertyPermission,61	};6263	use super::*;6465	#[pallet::config]66	pub trait Config:67		frame_system::Config68		+ pallet_common::Config69		+ pallet_fungible::Config70		+ pallet_balances::Config71	{72		/// The overarching event type.73		type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;7475		/// Origin for force registering of a foreign asset.76		type ForceRegisterOrigin: EnsureOrigin<Self::RuntimeOrigin>;7778		/// The ID of the foreign assets pallet.79		type PalletId: Get<PalletId>;8081		/// Self-location of this parachain.82		type SelfLocation: Get<MultiLocation>;8384		/// The converter from a MultiLocation to a CrossAccountId.85		type LocationToAccountId: ConvertLocation<Self::CrossAccountId>;8687		/// Weight information for the extrinsics in this module.88		type WeightInfo: WeightInfo;89	}9091	#[pallet::error]92	pub enum Error<T> {93		/// The foreign asset is already registered.94		ForeignAssetAlreadyRegistered,95	}9697	#[pallet::event]98	#[pallet::generate_deposit(fn deposit_event)]99	pub enum Event<T: Config> {100		/// The foreign asset registered.101		ForeignAssetRegistered {102			collection_id: CollectionId,103			asset_id: Box<AssetId>,104		},105	}106107	/// The corresponding collections of foreign assets.108	#[pallet::storage]109	#[pallet::getter(fn foreign_asset_to_collection)]110	pub type ForeignAssetToCollection<T: Config> =111		StorageMap<_, Twox64Concat, staging_xcm::v3::AssetId, CollectionId, OptionQuery>;112113	/// The corresponding foreign assets of collections.114	#[pallet::storage]115	#[pallet::getter(fn collection_to_foreign_asset)]116	pub type CollectionToForeignAsset<T: Config> =117		StorageMap<_, Twox64Concat, CollectionId, staging_xcm::v3::AssetId, OptionQuery>;118119	/// The correponding NFT token id of reserve NFTs120	#[pallet::storage]121	#[pallet::getter(fn foreign_reserve_asset_instance_to_token_id)]122	pub type ForeignReserveAssetInstanceToTokenId<T: Config> = StorageDoubleMap<123		Hasher1 = Twox64Concat,124		Key1 = CollectionId,125		Hasher2 = Blake2_128Concat,126		Key2 = staging_xcm::v3::AssetInstance,127		Value = TokenId,128		QueryKind = OptionQuery,129	>;130131	/// The correponding reserve NFT of a token ID132	#[pallet::storage]133	#[pallet::getter(fn token_id_to_foreign_reserve_asset_instance)]134	pub type TokenIdToForeignReserveAssetInstance<T: Config> = StorageDoubleMap<135		Hasher1 = Twox64Concat,136		Key1 = CollectionId,137		Hasher2 = Blake2_128Concat,138		Key2 = TokenId,139		Value = staging_xcm::v3::AssetInstance,140		QueryKind = OptionQuery,141	>;142143	#[pallet::pallet]144	pub struct Pallet<T>(_);145146	#[pallet::call]147	impl<T: Config> Pallet<T> {148		#[pallet::call_index(0)]149		#[pallet::weight(<T as Config>::WeightInfo::register_foreign_asset())]150		pub fn force_register_foreign_asset(151			origin: OriginFor<T>,152			asset_id: Box<AssetId>,153			name: CollectionName,154			token_prefix: CollectionTokenPrefix,155			mode: ForeignCollectionMode,156		) -> DispatchResult {157			T::ForceRegisterOrigin::ensure_origin(origin.clone())?;158159			ensure!(160				!<ForeignAssetToCollection<T>>::contains_key(*asset_id),161				<Error<T>>::ForeignAssetAlreadyRegistered,162			);163164			let foreign_collection_owner = Self::pallet_account();165166			let description: CollectionDescription = "Foreign Assets Collection"167				.encode_utf16()168				.collect::<Vec<_>>()169				.try_into()170				.expect("description length < max description length; qed");171172			let payer = None;173			let is_special_collection = true;174			let collection_id = T::CollectionDispatch::create_raw(175				foreign_collection_owner,176				payer,177				is_special_collection,178				CreateCollectionData {179					name,180					token_prefix,181					description,182					mode: mode.into(),183184					properties: vec![Property {185						key: Self::reserve_location_property_key(),186						value: asset_id187							.encode()188							.try_into()189							.expect("multilocation is less than 32k; qed"),190					}]191					.try_into()192					.expect("just one property can always be stored; qed"),193194					token_property_permissions: vec![PropertyKeyPermission {195						key: Self::reserve_asset_instance_property_key(),196						permission: PropertyPermission {197							mutable: false,198							collection_admin: true,199							token_owner: false,200						},201					}]202					.try_into()203					.expect("just one property permission can always be stored; qed"),204					..Default::default()205				},206			)?;207208			<ForeignAssetToCollection<T>>::insert(*asset_id, collection_id);209			<CollectionToForeignAsset<T>>::insert(collection_id, *asset_id);210211			Self::deposit_event(Event::<T>::ForeignAssetRegistered {212				collection_id,213				asset_id,214			});215216			Ok(())217		}218	}219}220221impl<T: Config> Pallet<T> {222	fn pallet_account() -> T::CrossAccountId {223		let owner: T::AccountId = T::PalletId::get().into_account_truncating();224		T::CrossAccountId::from_sub(owner)225	}226227	fn reserve_location_property_key() -> PropertyKey {228		b"reserve-location"229			.to_vec()230			.try_into()231			.expect("key length < max property key length; qed")232	}233234	fn reserve_asset_instance_property_key() -> PropertyKey {235		b"reserve-asset-instance"236			.to_vec()237			.try_into()238			.expect("key length < max property key length; qed")239	}240241	/// Converts a concrete asset ID (the asset multilocation) to a local collection on Unique Network.242	///243	/// The multilocation corresponds to a local collection if:244	/// * It is `Here` location that corresponds to the native token of this parachain.245	/// * It is `../Parachain(<Unique Network Para ID>)` that also corresponds to the native token of this parachain.246	/// * It is `../Parachain(<Unique Network Para ID>)/GeneralIndex(<Collection ID>)` that corresponds247	/// to the collection with the ID equal to `<Collection ID>`. The `<Collection ID>` must be in the valid range,248	/// otherwise `None` is returned.249	/// * It is `GeneralIndex(<Collection ID>)`. Same as the last one above.250	///251	/// If the multilocation doesn't match the patterns listed above,252	/// or the `<Collection ID>` points to a foreign collection,253	/// `None` is returned, identifying that the given multilocation doesn't correspond to a local collection.254	fn local_asset_id_to_collection(asset_id: &AssetId) -> Option<CollectionLocality> {255		let AssetId::Concrete(asset_location) = asset_id else {256			return None;257		};258259		let self_location = T::SelfLocation::get();260261		if *asset_location == Here.into() || *asset_location == self_location {262			return Some(CollectionLocality::Local(NATIVE_FUNGIBLE_COLLECTION_ID));263		}264265		let prefix = if asset_location.parents == 0 {266			&Here267		} else if asset_location.parents == self_location.parents {268			&self_location.interior269		} else {270			return None;271		};272273		let GeneralIndex(collection_id) = asset_location.interior.match_and_split(prefix)? else {274			return None;275		};276277		let collection_id = CollectionId((*collection_id).try_into().ok()?);278279		Self::collection_to_foreign_asset(collection_id)280			.is_none()281			.then_some(CollectionLocality::Local(collection_id))282	}283284	/// Converts an asset ID to a Unique Network's collection locality (either foreign or a local one).285	///286	/// The function will check if the asset's reserve location has the corresponding287	/// foreign collection on Unique Network,288	/// and will return the "foreign" locality containing the collection ID if found.289	///290	/// If no corresponding foreign collection is found, the function will check291	/// if the asset's reserve location corresponds to a local collection.292	/// If the local collection is found, the "local" locality with the collection ID is returned.293	///294	/// If all of the above have failed, the `AssetIdConversionFailed` error will be returned.295	fn asset_to_collection(asset_id: &AssetId) -> Result<CollectionLocality, XcmError> {296		Self::foreign_asset_to_collection(asset_id)297			.map(CollectionLocality::Foreign)298			.or_else(|| Self::local_asset_id_to_collection(asset_id))299			.ok_or_else(|| XcmExecutorError::AssetIdConversionFailed.into())300	}301302	/// Converts an XCM asset instance of local collection to the Unique Network's token ID.303	///304	/// The asset instance corresponds to the Unique Network's token ID if it is in the following format:305	/// `AssetInstance::Index(<token ID>)`.306	///307	/// If the asset instance is not in the valid format or the `<token ID>` can't fit into the valid token ID,308	/// `None` will be returned.309	fn local_asset_instance_to_token_id(asset_instance: &AssetInstance) -> Option<TokenId> {310		match asset_instance {311			AssetInstance::Index(token_id) => Some(TokenId((*token_id).try_into().ok()?)),312			_ => None,313		}314	}315316	/// Obtains the token ID of the `asset_instance` in the collection.317	fn asset_instance_to_token_id(318		collection_locality: CollectionLocality,319		asset_instance: &AssetInstance,320	) -> Option<TokenId> {321		match collection_locality {322			CollectionLocality::Local(_) => Self::local_asset_instance_to_token_id(asset_instance),323			CollectionLocality::Foreign(collection_id) => {324				Self::foreign_reserve_asset_instance_to_token_id(collection_id, asset_instance)325			}326		}327	}328329	/// Creates a foreign item in the the collection.330	fn create_foreign_asset_instance(331		xcm_ext: &dyn XcmExtensions<T>,332		collection_id: CollectionId,333		asset_instance: &AssetInstance,334		to: T::CrossAccountId,335	) -> DispatchResult {336		let asset_instance_encoded = asset_instance.encode();337338		let derivative_token_id = xcm_ext.create_item(339			&Self::pallet_account(),340			to,341			CreateItemData::NFT(CreateNftData {342				properties: vec![Property {343					key: Self::reserve_asset_instance_property_key(),344					value: asset_instance_encoded345						.try_into()346						.expect("asset instance length <= 32 bytes which is less than value length limit; qed"),347				}]348				.try_into()349				.expect("just one property can always be stored; qed"),350			}),351			&ZeroBudget,352		)?;353354		<ForeignReserveAssetInstanceToTokenId<T>>::insert(355			collection_id,356			asset_instance,357			derivative_token_id,358		);359360		<TokenIdToForeignReserveAssetInstance<T>>::insert(361			collection_id,362			derivative_token_id,363			asset_instance,364		);365366		Ok(())367	}368369	/// Deposits an asset instance to the `to` account.370	///371	/// Either transfers an existing item from the pallet's account372	/// or creates a foreign item.373	fn deposit_asset_instance(374		xcm_ext: &dyn XcmExtensions<T>,375		collection_locality: CollectionLocality,376		asset_instance: &AssetInstance,377		to: T::CrossAccountId,378	) -> XcmResult {379		let token_id = Self::asset_instance_to_token_id(collection_locality, asset_instance);380381		let deposit_result = match (collection_locality, token_id) {382			(_, Some(token_id)) => {383				let depositor = &Self::pallet_account();384				let from = depositor;385				let amount = 1;386387				xcm_ext.transfer_item(depositor, from, &to, token_id, amount, &ZeroBudget)388			}389			(CollectionLocality::Foreign(collection_id), None) => {390				Self::create_foreign_asset_instance(xcm_ext, collection_id, asset_instance, to)391			}392			(CollectionLocality::Local(_), None) => {393				return Err(XcmError::AssetNotFound);394			}395		};396397		deposit_result398			.map_err(|_| XcmError::FailedToTransactAsset("non-fungible item deposit failed"))399	}400401	/// Withdraws an asset instance from the `from` account.402	///403	/// Transfers the asset instance to the pallet's account.404	fn withdraw_asset_instance(405		xcm_ext: &dyn XcmExtensions<T>,406		collection_locality: CollectionLocality,407		asset_instance: &AssetInstance,408		from: T::CrossAccountId,409	) -> XcmResult {410		let token_id = Self::asset_instance_to_token_id(collection_locality, asset_instance)411			.ok_or(XcmError::AssetNotFound)?;412413		let depositor = &from;414		let to = Self::pallet_account();415		let amount = 1;416		xcm_ext417			.transfer_item(depositor, &from, &to, token_id, amount, &ZeroBudget)418			.map_err(|_| XcmError::FailedToTransactAsset("non-fungible item withdraw failed"))?;419420		Ok(())421	}422}423424impl<T: Config> TransactAsset for Pallet<T> {425	fn can_check_in(426		_origin: &MultiLocation,427		_what: &MultiAsset,428		_context: &XcmContext,429	) -> XcmResult {430		Err(XcmError::Unimplemented)431	}432433	fn check_in(_origin: &MultiLocation, _what: &MultiAsset, _context: &XcmContext) {}434435	fn can_check_out(436		_dest: &MultiLocation,437		_what: &MultiAsset,438		_context: &XcmContext,439	) -> XcmResult {440		Err(XcmError::Unimplemented)441	}442443	fn check_out(_dest: &MultiLocation, _what: &MultiAsset, _context: &XcmContext) {}444445	fn deposit_asset(446		what: &MultiAsset,447		to: &MultiLocation,448		_context: Option<&XcmContext>,449	) -> XcmResult {450		let to = T::LocationToAccountId::convert_location(to)451			.ok_or(XcmExecutorError::AccountIdConversionFailed)?;452453		let collection_locality = Self::asset_to_collection(&what.id)?;454		let dispatch = T::CollectionDispatch::dispatch(*collection_locality)455			.map_err(|_| XcmError::AssetNotFound)?;456457		let collection = dispatch.as_dyn();458		let xcm_ext = collection.xcm_extensions().ok_or(XcmError::Unimplemented)?;459460		match what.fun {461			Fungibility::Fungible(amount) => xcm_ext462				.create_item(463					&Self::pallet_account(),464					to,465					CreateItemData::Fungible(CreateFungibleData { value: amount }),466					&ZeroBudget,467				)468				.map(|_| ())469				.map_err(|_| XcmError::FailedToTransactAsset("fungible item deposit failed")),470471			Fungibility::NonFungible(asset_instance) => {472				Self::deposit_asset_instance(xcm_ext, collection_locality, &asset_instance, to)473			}474		}475	}476477	fn withdraw_asset(478		what: &MultiAsset,479		from: &MultiLocation,480		_maybe_context: Option<&XcmContext>,481	) -> Result<staging_xcm_executor::Assets, XcmError> {482		let from = T::LocationToAccountId::convert_location(from)483			.ok_or(XcmExecutorError::AccountIdConversionFailed)?;484485		let collection_locality = Self::asset_to_collection(&what.id)?;486		let dispatch = T::CollectionDispatch::dispatch(*collection_locality)487			.map_err(|_| XcmError::AssetNotFound)?;488489		let collection = dispatch.as_dyn();490		let xcm_ext = collection.xcm_extensions().ok_or(XcmError::NoPermission)?;491492		match what.fun {493			Fungibility::Fungible(amount) => xcm_ext494				.burn_item(from, TokenId::default(), amount)495				.map_err(|_| XcmError::FailedToTransactAsset("fungible item withdraw failed"))?,496497			Fungibility::NonFungible(asset_instance) => {498				Self::withdraw_asset_instance(xcm_ext, collection_locality, &asset_instance, from)?;499			}500		}501502		Ok(what.clone().into())503	}504505	fn internal_transfer_asset(506		what: &MultiAsset,507		from: &MultiLocation,508		to: &MultiLocation,509		_context: &XcmContext,510	) -> Result<staging_xcm_executor::Assets, XcmError> {511		let from = T::LocationToAccountId::convert_location(from)512			.ok_or(XcmExecutorError::AccountIdConversionFailed)?;513514		let to = T::LocationToAccountId::convert_location(to)515			.ok_or(XcmExecutorError::AccountIdConversionFailed)?;516517		let collection_locality = Self::asset_to_collection(&what.id)?;518519		let dispatch = T::CollectionDispatch::dispatch(*collection_locality)520			.map_err(|_| XcmError::AssetNotFound)?;521		let collection = dispatch.as_dyn();522		let xcm_ext = collection.xcm_extensions().ok_or(XcmError::NoPermission)?;523524		let depositor = &from;525526		let token_id;527		let amount;528		let map_error: fn(DispatchError) -> XcmError;529530		match what.fun {531			Fungibility::Fungible(fungible_amount) => {532				token_id = TokenId::default();533				amount = fungible_amount;534				map_error = |_| XcmError::FailedToTransactAsset("fungible item transfer failed");535			}536537			Fungibility::NonFungible(asset_instance) => {538				token_id = Self::asset_instance_to_token_id(collection_locality, &asset_instance)539					.ok_or(XcmError::AssetNotFound)?;540541				amount = 1;542				map_error = |_| XcmError::FailedToTransactAsset("non-fungible item transfer failed")543			}544		}545546		xcm_ext547			.transfer_item(depositor, &from, &to, token_id, amount, &ZeroBudget)548			.map_err(map_error)?;549550		Ok(what.clone().into())551	}552}553554#[derive(Clone, Copy)]555pub enum CollectionLocality {556	Local(CollectionId),557	Foreign(CollectionId),558}559560impl Deref for CollectionLocality {561	type Target = CollectionId;562563	fn deref(&self) -> &Self::Target {564		match self {565			Self::Local(id) => id,566			Self::Foreign(id) => id,567		}568	}569}570571pub struct CurrencyIdConvert<T: Config>(PhantomData<T>);572impl<T: Config> sp_runtime::traits::Convert<CollectionId, Option<MultiLocation>>573	for CurrencyIdConvert<T>574{575	fn convert(collection_id: CollectionId) -> Option<MultiLocation> {576		if collection_id == NATIVE_FUNGIBLE_COLLECTION_ID {577			Some(T::SelfLocation::get())578		} else {579			<Pallet<T>>::collection_to_foreign_asset(collection_id)580				.and_then(|asset_id| match asset_id {581					AssetId::Concrete(location) => Some(location),582					_ => None,583				})584				.or_else(|| {585					T::SelfLocation::get()586						.pushed_with_interior(GeneralIndex(collection_id.0.into()))587						.ok()588				})589		}590	}591}592593#[derive(Encode, Decode, Eq, Debug, Clone, PartialEq, TypeInfo, MaxEncodedLen)]594pub enum ForeignCollectionMode {595	NFT,596	Fungible(u8),597}598599impl From<ForeignCollectionMode> for CollectionMode {600	fn from(value: ForeignCollectionMode) -> Self {601		match value {602			ForeignCollectionMode::NFT => Self::NFT,603			ForeignCollectionMode::Fungible(decimals) => Self::Fungible(decimals),604		}605	}606}607608pub struct FreeForAll;609610impl WeightTrader for FreeForAll {611	fn new() -> Self {612		Self613	}614615	fn buy_weight(616		&mut self,617		weight: Weight,618		payment: Assets,619		_xcm: &XcmContext,620	) -> Result<Assets, XcmError> {621		log::trace!(target: "fassets::weight", "buy_weight weight: {:?}, payment: {:?}", weight, payment);622		Ok(payment)623	}624}