git.delta.rocks / unique-network / refs/commits / 8522be9745b8

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//! # Refungible Pallet18//!19//! The Refungible pallet provides functionality for handling refungible collections and tokens.20//!21//! - [`Config`]22//! - [`RefungibleHandle`]23//! - [`Pallet`]24//! - [`CommonWeights`](common::CommonWeights)25//!26//! ## Overview27//!28//! The Refungible pallet provides functions for:29//!30//! - RFT collection creation and removal31//! - Minting and burning of RFT tokens32//! - Partition and repartition of RFT tokens33//! - Retrieving number of pieces of RFT token34//! - Retrieving account balances35//! - Transfering RFT token pieces36//! - Burning RFT token pieces37//! - Setting and checking allowance for RFT tokens38//!39//! ### Terminology40//!41//! - **RFT token:** Non fungible token that was partitioned to pieces. If an account owns all42//!   of the RFT token pieces than it owns the RFT token and can repartition it.43//!44//! - **RFT Collection:** A collection of RFT tokens. All RFT tokens are part of a collection.45//!   Each collection has its own settings and set of permissions.46//!47//! - **RFT token piece:** A fungible part of an RFT token.48//!49//! - **Balance:** RFT token pieces owned by an account50//!51//! - **Allowance:** Maximum number of RFT token pieces that one account is allowed to52//!   transfer from the balance of another account53//!54//! - **Burning:** The process of “deleting” a token from a collection or removing token pieces from55//!   an account balance.56//!57//! ### Implementations58//!59//! The Refungible pallet provides implementations for the following traits. If these traits provide60//! the functionality that you need, then you can avoid coupling with the Refungible pallet.61//!62//! - [`CommonWeightInfo`](pallet_common::CommonWeightInfo): Functions for retrieval of transaction weight63//! - [`CommonCollectionOperations`](pallet_common::CommonCollectionOperations): Functions for dealing64//!   with collections65//! - [`RefungibleExtensions`](pallet_common::RefungibleExtensions): Functions specific for refungible66//!   collection67//!68//! ## Interface69//!70//! ### Dispatchable Functions71//!72//! - `init_collection` - Create RFT collection. RFT collection can be configured to allow or deny access for73//!   some accounts.74//! - `destroy_collection` - Destroy exising RFT collection. There should be no tokens in the collection.75//! - `burn` - Burn some amount of RFT token pieces owned by account. Burns the RFT token if no pieces left.76//! - `transfer` - Transfer some amount of RFT token pieces. Transfers should be enabled for RFT collection.77//!   Nests the RFT token if RFT token pieces are sent to another token.78//! - `create_item` - Mint RFT token in collection. Sender should have permission to mint tokens.79//! - `set_allowance` - Set allowance for another account to transfer balance from sender's account.80//! - `repartition` - Repartition token to selected number of pieces. Sender should own all existing pieces.81//!82//! ## Assumptions83//!84//! * Total number of pieces for one token shouldn't exceed `up_data_structs::MAX_REFUNGIBLE_PIECES`.85//! * Total number of tokens of all types shouldn't be greater than `up_data_structs::MAX_TOKEN_PREFIX_LENGTH`.86//! * Sender should be in collection's allow list to perform operations on tokens.8788#![cfg_attr(not(feature = "std"), no_std)]8990use crate::erc_token::ERC20Events;9192use codec::{Encode, Decode, MaxEncodedLen};93use core::ops::Deref;94use evm_coder::ToLog;95use frame_support::{BoundedVec, ensure, fail, storage::with_transaction, transactional};96use pallet_evm::{account::CrossAccountId, Pallet as PalletEvm};97use pallet_evm_coder_substrate::WithRecorder;98use pallet_common::{99	CommonCollectionOperations, Error as CommonError, Event as CommonEvent, Pallet as PalletCommon,100};101use pallet_structure::Pallet as PalletStructure;102use scale_info::TypeInfo;103use sp_core::H160;104use sp_runtime::{ArithmeticError, DispatchError, DispatchResult, TransactionOutcome};105use sp_std::{vec::Vec, vec, collections::btree_map::BTreeMap};106use up_data_structs::{107	AccessMode, budget::Budget, CollectionId, CreateCollectionData, CreateRefungibleExData,108	CustomDataLimit, mapping::TokenAddressMapping, MAX_REFUNGIBLE_PIECES, TokenId, Property,109	PropertyKey, PropertyKeyPermission, PropertyPermission, PropertyScope, PropertyValue,110	TrySetProperty,111};112113pub use pallet::*;114#[cfg(feature = "runtime-benchmarks")]115pub mod benchmarking;116pub mod common;117pub mod erc;118pub mod erc_token;119pub mod weights;120pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;121122/// Token data, stored independently from other data used to describe it123/// for the convenience of database access. Notably contains the token metadata.124#[struct_versioning::versioned(version = 2, upper)]125#[derive(Encode, Decode, Default, TypeInfo, MaxEncodedLen)]126pub struct ItemData {127	pub const_data: BoundedVec<u8, CustomDataLimit>,128129	#[version(..2)]130	pub variable_data: BoundedVec<u8, CustomDataLimit>,131}132133#[frame_support::pallet]134pub mod pallet {135	use super::*;136	use frame_support::{137		Blake2_128, Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key,138		traits::StorageVersion,139	};140	use frame_system::pallet_prelude::*;141	use up_data_structs::{CollectionId, TokenId};142	use super::weights::WeightInfo;143144	#[pallet::error]145	pub enum Error<T> {146		/// Not Refungible item data used to mint in Refungible collection.147		NotRefungibleDataUsedToMintFungibleCollectionToken,148		/// Maximum refungibility exceeded.149		WrongRefungiblePieces,150		/// Refungible token can't be repartitioned by user who isn't owns all pieces.151		RepartitionWhileNotOwningAllPieces,152		/// Refungible token can't nest other tokens.153		RefungibleDisallowsNesting,154		/// Setting item properties is not allowed.155		SettingPropertiesNotAllowed,156	}157158	#[pallet::config]159	pub trait Config:160		frame_system::Config + pallet_common::Config + pallet_structure::Config161	{162		type WeightInfo: WeightInfo;163	}164165	const STORAGE_VERSION: StorageVersion = StorageVersion::new(1);166167	#[pallet::pallet]168	#[pallet::storage_version(STORAGE_VERSION)]169	#[pallet::generate_store(pub(super) trait Store)]170	pub struct Pallet<T>(_);171172	/// Total amount of minted tokens in a collection.173	#[pallet::storage]174	pub type TokensMinted<T: Config> =175		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;176177	/// Amount of tokens burnt in a collection.178	#[pallet::storage]179	pub type TokensBurnt<T: Config> =180		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;181182	/// Token data, used to partially describe a token.183	#[pallet::storage]184	pub type TokenData<T: Config> = StorageNMap<185		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),186		Value = ItemData,187		QueryKind = ValueQuery,188	>;189190	/// Amount of pieces a refungible token is split into.191	#[pallet::storage]192	#[pallet::getter(fn token_properties)]193	pub type TokenProperties<T: Config> = StorageNMap<194		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),195		Value = up_data_structs::Properties,196		QueryKind = ValueQuery,197		OnEmpty = up_data_structs::TokenProperties,198	>;199200	/// Total amount of pieces for token201	#[pallet::storage]202	pub type TotalSupply<T: Config> = StorageNMap<203		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),204		Value = u128,205		QueryKind = ValueQuery,206	>;207208	/// Used to enumerate tokens owned by account.209	#[pallet::storage]210	pub type Owned<T: Config> = StorageNMap<211		Key = (212			Key<Twox64Concat, CollectionId>,213			Key<Blake2_128Concat, T::CrossAccountId>,214			Key<Twox64Concat, TokenId>,215		),216		Value = bool,217		QueryKind = ValueQuery,218	>;219220	/// Amount of tokens (not pieces) partially owned by an account within a collection.221	#[pallet::storage]222	pub type AccountBalance<T: Config> = StorageNMap<223		Key = (224			Key<Twox64Concat, CollectionId>,225			// Owner226			Key<Blake2_128Concat, T::CrossAccountId>,227		),228		Value = u32,229		QueryKind = ValueQuery,230	>;231232	/// Amount of token pieces owned by account.233	#[pallet::storage]234	pub type Balance<T: Config> = StorageNMap<235		Key = (236			Key<Twox64Concat, CollectionId>,237			Key<Twox64Concat, TokenId>,238			// Owner239			Key<Blake2_128Concat, T::CrossAccountId>,240		),241		Value = u128,242		QueryKind = ValueQuery,243	>;244245	/// Allowance set by a token owner for another user to perform one of certain transactions on a number of pieces of a token.246	#[pallet::storage]247	pub type Allowance<T: Config> = StorageNMap<248		Key = (249			Key<Twox64Concat, CollectionId>,250			Key<Twox64Concat, TokenId>,251			// Owner252			Key<Blake2_128, T::CrossAccountId>,253			// Spender254			Key<Blake2_128Concat, T::CrossAccountId>,255		),256		Value = u128,257		QueryKind = ValueQuery,258	>;259260	#[pallet::hooks]261	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {262		fn on_runtime_upgrade() -> Weight {263			if StorageVersion::get::<Pallet<T>>() < StorageVersion::new(1) {264				<TokenData<T>>::translate_values::<ItemDataVersion1, _>(|v| {265					Some(<ItemDataVersion2>::from(v))266				})267			}268269			0270		}271	}272}273274pub struct RefungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);275impl<T: Config> RefungibleHandle<T> {276	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {277		Self(inner)278	}279	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {280		self.0281	}282	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {283		&mut self.0284	}285}286287impl<T: Config> Deref for RefungibleHandle<T> {288	type Target = pallet_common::CollectionHandle<T>;289290	fn deref(&self) -> &Self::Target {291		&self.0292	}293}294295impl<T: Config> WithRecorder<T> for RefungibleHandle<T> {296	fn recorder(&self) -> &pallet_evm_coder_substrate::SubstrateRecorder<T> {297		self.0.recorder()298	}299	fn into_recorder(self) -> pallet_evm_coder_substrate::SubstrateRecorder<T> {300		self.0.into_recorder()301	}302}303304impl<T: Config> Pallet<T> {305	/// Get number of RFT tokens in collection306	pub fn total_supply(collection: &RefungibleHandle<T>) -> u32 {307		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)308	}309310	/// Check that RFT token exists311	///312	/// - `token`: Token ID.313	pub fn token_exists(collection: &RefungibleHandle<T>, token: TokenId) -> bool {314		<TotalSupply<T>>::contains_key((collection.id, token))315	}316317	pub fn set_scoped_token_property(318		collection_id: CollectionId,319		token_id: TokenId,320		scope: PropertyScope,321		property: Property,322	) -> DispatchResult {323		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {324			properties.try_scoped_set(scope, property.key, property.value)325		})326		.map_err(<CommonError<T>>::from)?;327328		Ok(())329	}330331	pub fn set_scoped_token_properties(332		collection_id: CollectionId,333		token_id: TokenId,334		scope: PropertyScope,335		properties: impl Iterator<Item = Property>,336	) -> DispatchResult {337		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {338			stored_properties.try_scoped_set_from_iter(scope, properties)339		})340		.map_err(<CommonError<T>>::from)?;341342		Ok(())343	}344}345346// unchecked calls skips any permission checks347impl<T: Config> Pallet<T> {348	/// Create RFT collection349	///350	/// `init_collection` will take non-refundable deposit for collection creation.351	///352	/// - `data`: Contains settings for collection limits and permissions.353	pub fn init_collection(354		owner: T::CrossAccountId,355		data: CreateCollectionData<T::AccountId>,356	) -> Result<CollectionId, DispatchError> {357		<PalletCommon<T>>::init_collection(owner, data, false)358	}359360	/// Destroy RFT collection361	///362	/// `destroy_collection` will throw error if collection contains any tokens.363	/// Only owner can destroy collection.364	pub fn destroy_collection(365		collection: RefungibleHandle<T>,366		sender: &T::CrossAccountId,367	) -> DispatchResult {368		let id = collection.id;369370		if Self::collection_has_tokens(id) {371			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());372		}373374		// =========375376		PalletCommon::destroy_collection(collection.0, sender)?;377378		<TokensMinted<T>>::remove(id);379		<TokensBurnt<T>>::remove(id);380		<TokenData<T>>::remove_prefix((id,), None);381		<TotalSupply<T>>::remove_prefix((id,), None);382		<Balance<T>>::remove_prefix((id,), None);383		<Allowance<T>>::remove_prefix((id,), None);384		<Owned<T>>::remove_prefix((id,), None);385		<AccountBalance<T>>::remove_prefix((id,), None);386		Ok(())387	}388389	fn collection_has_tokens(collection_id: CollectionId) -> bool {390		<TokenData<T>>::iter_prefix((collection_id,))391			.next()392			.is_some()393	}394395	pub fn burn_token_unchecked(396		collection: &RefungibleHandle<T>,397		token_id: TokenId,398	) -> DispatchResult {399		let burnt = <TokensBurnt<T>>::get(collection.id)400			.checked_add(1)401			.ok_or(ArithmeticError::Overflow)?;402403		<TokensBurnt<T>>::insert(collection.id, burnt);404		<TokenData<T>>::remove((collection.id, token_id));405		<TokenProperties<T>>::remove((collection.id, token_id));406		<TotalSupply<T>>::remove((collection.id, token_id));407		<Balance<T>>::remove_prefix((collection.id, token_id), None);408		<Allowance<T>>::remove_prefix((collection.id, token_id), None);409		// TODO: ERC721 transfer event410		Ok(())411	}412413	/// Burn RFT token pieces414	///415	/// `burn` will decrease total amount of token pieces and amount owned by sender.416	/// `burn` can be called even if there are multiple owners of the RFT token.417	/// If sender wouldn't have any pieces left after `burn` than she will stop being418	/// one of the owners of the token. If there is no account that owns any pieces of419	/// the token than token will be burned too.420	///421	/// - `amount`: Amount of token pieces to burn.422	/// - `token`: Token who's pieces should be burned423	/// - `collection`: Collection that contains the token424	pub fn burn(425		collection: &RefungibleHandle<T>,426		owner: &T::CrossAccountId,427		token: TokenId,428		amount: u128,429	) -> DispatchResult {430		let total_supply = <TotalSupply<T>>::get((collection.id, token))431			.checked_sub(amount)432			.ok_or(<CommonError<T>>::TokenValueTooLow)?;433434		// This was probally last owner of this token?435		if total_supply == 0 {436			// Ensure user actually owns this amount437			ensure!(438				<Balance<T>>::get((collection.id, token, owner)) == amount,439				<CommonError<T>>::TokenValueTooLow440			);441			let account_balance = <AccountBalance<T>>::get((collection.id, owner))442				.checked_sub(1)443				// Should not occur444				.ok_or(ArithmeticError::Underflow)?;445446			// =========447448			<Owned<T>>::remove((collection.id, owner, token));449			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);450			<AccountBalance<T>>::insert((collection.id, owner), account_balance);451			Self::burn_token_unchecked(collection, token)?;452			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(453				collection.id,454				token,455				owner.clone(),456				amount,457			));458			return Ok(());459		}460461		let balance = <Balance<T>>::get((collection.id, token, owner))462			.checked_sub(amount)463			.ok_or(<CommonError<T>>::TokenValueTooLow)?;464		let account_balance = if balance == 0 {465			<AccountBalance<T>>::get((collection.id, owner))466				.checked_sub(1)467				// Should not occur468				.ok_or(ArithmeticError::Underflow)?469		} else {470			0471		};472473		// =========474475		if balance == 0 {476			<Owned<T>>::remove((collection.id, owner, token));477			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);478			<Balance<T>>::remove((collection.id, token, owner));479			<AccountBalance<T>>::insert((collection.id, owner), account_balance);480		} else {481			<Balance<T>>::insert((collection.id, token, owner), balance);482		}483		<TotalSupply<T>>::insert((collection.id, token), total_supply);484485		<PalletEvm<T>>::deposit_log(486			ERC20Events::Transfer {487				from: *owner.as_eth(),488				to: H160::default(),489				value: amount.into(),490			}491			.to_log(T::EvmTokenAddressMapping::token_to_address(492				collection.id,493				token,494			)),495		);496		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(497			collection.id,498			token,499			owner.clone(),500			amount,501		));502		Ok(())503	}504505	#[transactional]506	fn modify_token_properties(507		collection: &RefungibleHandle<T>,508		sender: &T::CrossAccountId,509		token_id: TokenId,510		properties: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,511		is_token_create: bool,512		nesting_budget: &dyn Budget,513	) -> DispatchResult {514		let is_collection_admin = || collection.is_owner_or_admin(sender);515		let is_token_owner = || -> Result<bool, DispatchError> {516			let balance = collection.balance(sender.clone(), token_id);517			let total_pieces: u128 =518				Self::total_pieces(collection.id, token_id).unwrap_or(u128::MAX);519			if balance != total_pieces {520				return Ok(false);521			}522523			let is_bundle_owner = <PalletStructure<T>>::check_indirectly_owned(524				sender.clone(),525				collection.id,526				token_id,527				None,528				nesting_budget,529			)?;530531			Ok(is_bundle_owner)532		};533534		for (key, value) in properties {535			let permission = <PalletCommon<T>>::property_permissions(collection.id)536				.get(&key)537				.cloned()538				.unwrap_or_else(PropertyPermission::none);539540			let is_property_exists = TokenProperties::<T>::get((collection.id, token_id))541				.get(&key)542				.is_some();543544			match permission {545				PropertyPermission { mutable: false, .. } if is_property_exists => {546					return Err(<CommonError<T>>::NoPermission.into());547				}548549				PropertyPermission {550					collection_admin,551					token_owner,552					..553				} => {554					//TODO: investigate threats during public minting.555					let is_token_create =556						is_token_create && (collection_admin || token_owner) && value.is_some();557					if !(is_token_create558						|| (collection_admin && is_collection_admin())559						|| (token_owner && is_token_owner()?))560					{561						fail!(<CommonError<T>>::NoPermission);562					}563				}564			}565566			match value {567				Some(value) => {568					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {569						properties.try_set(key.clone(), value)570					})571					.map_err(<CommonError<T>>::from)?;572573					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(574						collection.id,575						token_id,576						key,577					));578				}579				None => {580					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {581						properties.remove(&key)582					})583					.map_err(<CommonError<T>>::from)?;584585					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(586						collection.id,587						token_id,588						key,589					));590				}591			}592		}593594		Ok(())595	}596597	pub fn set_token_properties(598		collection: &RefungibleHandle<T>,599		sender: &T::CrossAccountId,600		token_id: TokenId,601		properties: impl Iterator<Item = Property>,602		is_token_create: bool,603		nesting_budget: &dyn Budget,604	) -> DispatchResult {605		Self::modify_token_properties(606			collection,607			sender,608			token_id,609			properties.map(|p| (p.key, Some(p.value))),610			is_token_create,611			nesting_budget,612		)613	}614615	pub fn set_token_property(616		collection: &RefungibleHandle<T>,617		sender: &T::CrossAccountId,618		token_id: TokenId,619		property: Property,620		nesting_budget: &dyn Budget,621	) -> DispatchResult {622		let is_token_create = false;623624		Self::set_token_properties(625			collection,626			sender,627			token_id,628			[property].into_iter(),629			is_token_create,630			nesting_budget,631		)632	}633634	pub fn delete_token_properties(635		collection: &RefungibleHandle<T>,636		sender: &T::CrossAccountId,637		token_id: TokenId,638		property_keys: impl Iterator<Item = PropertyKey>,639		nesting_budget: &dyn Budget,640	) -> DispatchResult {641		let is_token_create = false;642643		Self::modify_token_properties(644			collection,645			sender,646			token_id,647			property_keys.into_iter().map(|key| (key, None)),648			is_token_create,649			nesting_budget,650		)651	}652653	pub fn delete_token_property(654		collection: &RefungibleHandle<T>,655		sender: &T::CrossAccountId,656		token_id: TokenId,657		property_key: PropertyKey,658		nesting_budget: &dyn Budget,659	) -> DispatchResult {660		Self::delete_token_properties(661			collection,662			sender,663			token_id,664			[property_key].into_iter(),665			nesting_budget,666		)667	}668669	/// Transfer RFT token pieces from one account to another.670	///671	/// If the sender is no longer owns any pieces after the `transfer` than she stops being an owner of the token.672	///673	/// - `from`: Owner of token pieces to transfer.674	/// - `to`: Recepient of transfered token pieces.675	/// - `amount`: Amount of token pieces to transfer.676	/// - `token`: Token whos pieces should be transfered677	/// - `collection`: Collection that contains the token678	pub fn transfer(679		collection: &RefungibleHandle<T>,680		from: &T::CrossAccountId,681		to: &T::CrossAccountId,682		token: TokenId,683		amount: u128,684		nesting_budget: &dyn Budget,685	) -> DispatchResult {686		ensure!(687			collection.limits.transfers_enabled(),688			<CommonError<T>>::TransferNotAllowed689		);690691		if collection.permissions.access() == AccessMode::AllowList {692			collection.check_allowlist(from)?;693			collection.check_allowlist(to)?;694		}695		<PalletCommon<T>>::ensure_correct_receiver(to)?;696697		let balance_from = <Balance<T>>::get((collection.id, token, from))698			.checked_sub(amount)699			.ok_or(<CommonError<T>>::TokenValueTooLow)?;700		let mut create_target = false;701		let from_to_differ = from != to;702		let balance_to = if from != to {703			let old_balance = <Balance<T>>::get((collection.id, token, to));704			if old_balance == 0 {705				create_target = true;706			}707			Some(708				old_balance709					.checked_add(amount)710					.ok_or(ArithmeticError::Overflow)?,711			)712		} else {713			None714		};715716		let account_balance_from = if balance_from == 0 {717			Some(718				<AccountBalance<T>>::get((collection.id, from))719					.checked_sub(1)720					// Should not occur721					.ok_or(ArithmeticError::Underflow)?,722			)723		} else {724			None725		};726		// Account data is created in token, AccountBalance should be increased727		// But only if from != to as we shouldn't check overflow in this case728		let account_balance_to = if create_target && from_to_differ {729			let account_balance_to = <AccountBalance<T>>::get((collection.id, to))730				.checked_add(1)731				.ok_or(ArithmeticError::Overflow)?;732			ensure!(733				account_balance_to < collection.limits.account_token_ownership_limit(),734				<CommonError<T>>::AccountTokenLimitExceeded,735			);736737			Some(account_balance_to)738		} else {739			None740		};741742		// =========743744		<PalletStructure<T>>::nest_if_sent_to_token(745			from.clone(),746			to,747			collection.id,748			token,749			nesting_budget,750		)?;751752		if let Some(balance_to) = balance_to {753			// from != to754			if balance_from == 0 {755				<Balance<T>>::remove((collection.id, token, from));756				<PalletStructure<T>>::unnest_if_nested(from, collection.id, token);757			} else {758				<Balance<T>>::insert((collection.id, token, from), balance_from);759			}760			<Balance<T>>::insert((collection.id, token, to), balance_to);761			if let Some(account_balance_from) = account_balance_from {762				<AccountBalance<T>>::insert((collection.id, from), account_balance_from);763				<Owned<T>>::remove((collection.id, from, token));764			}765			if let Some(account_balance_to) = account_balance_to {766				<AccountBalance<T>>::insert((collection.id, to), account_balance_to);767				<Owned<T>>::insert((collection.id, to, token), true);768			}769		}770771		<PalletEvm<T>>::deposit_log(772			ERC20Events::Transfer {773				from: *from.as_eth(),774				to: *to.as_eth(),775				value: amount.into(),776			}777			.to_log(T::EvmTokenAddressMapping::token_to_address(778				collection.id,779				token,780			)),781		);782		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(783			collection.id,784			token,785			from.clone(),786			to.clone(),787			amount,788		));789		Ok(())790	}791792	/// Batched operation to create multiple RFT tokens.793	///794	/// Same as `create_item` but creates multiple tokens.795	///796	/// - `data`: Same as 'data` in `create_item` but contains data for multiple tokens.797	pub fn create_multiple_items(798		collection: &RefungibleHandle<T>,799		sender: &T::CrossAccountId,800		data: Vec<CreateRefungibleExData<T::CrossAccountId>>,801		nesting_budget: &dyn Budget,802	) -> DispatchResult {803		if !collection.is_owner_or_admin(sender) {804			ensure!(805				collection.permissions.mint_mode(),806				<CommonError<T>>::PublicMintingNotAllowed807			);808			collection.check_allowlist(sender)?;809810			for item in data.iter() {811				for user in item.users.keys() {812					collection.check_allowlist(user)?;813				}814			}815		}816817		for item in data.iter() {818			for (owner, _) in item.users.iter() {819				<PalletCommon<T>>::ensure_correct_receiver(owner)?;820			}821		}822823		// Total pieces per tokens824		let totals = data825			.iter()826			.map(|data| {827				Ok(data828					.users829					.iter()830					.map(|u| u.1)831					.try_fold(0u128, |acc, v| acc.checked_add(*v))832					.ok_or(ArithmeticError::Overflow)?)833			})834			.collect::<Result<Vec<_>, DispatchError>>()?;835		for total in &totals {836			ensure!(837				*total <= MAX_REFUNGIBLE_PIECES,838				<Error<T>>::WrongRefungiblePieces839			);840		}841842		let first_token_id = <TokensMinted<T>>::get(collection.id);843		let tokens_minted = first_token_id844			.checked_add(data.len() as u32)845			.ok_or(ArithmeticError::Overflow)?;846		ensure!(847			tokens_minted < collection.limits.token_limit(),848			<CommonError<T>>::CollectionTokenLimitExceeded849		);850851		let mut balances = BTreeMap::new();852		for data in &data {853			for owner in data.users.keys() {854				let balance = balances855					.entry(owner)856					.or_insert_with(|| <AccountBalance<T>>::get((collection.id, owner)));857				*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;858859				ensure!(860					*balance <= collection.limits.account_token_ownership_limit(),861					<CommonError<T>>::AccountTokenLimitExceeded,862				);863			}864		}865866		for (i, token) in data.iter().enumerate() {867			let token_id = TokenId(first_token_id + i as u32 + 1);868			for (to, _) in token.users.iter() {869				<PalletStructure<T>>::check_nesting(870					sender.clone(),871					to,872					collection.id,873					token_id,874					nesting_budget,875				)?;876			}877		}878879		// =========880881		with_transaction(|| {882			for (i, data) in data.iter().enumerate() {883				let token_id = first_token_id + i as u32 + 1;884				<TotalSupply<T>>::insert((collection.id, token_id), totals[i]);885886				<TokenData<T>>::insert(887					(collection.id, token_id),888					ItemData {889						const_data: data.const_data.clone(),890					},891				);892893				for (user, amount) in data.users.iter() {894					if *amount == 0 {895						continue;896					}897					<Balance<T>>::insert((collection.id, token_id, &user), amount);898					<Owned<T>>::insert((collection.id, &user, TokenId(token_id)), true);899					<PalletStructure<T>>::nest_if_sent_to_token_unchecked(900						user,901						collection.id,902						TokenId(token_id),903					);904				}905906				if let Err(e) = Self::set_token_properties(907					collection,908					sender,909					TokenId(token_id),910					data.properties.clone().into_iter(),911					true,912					nesting_budget,913				) {914					return TransactionOutcome::Rollback(Err(e));915				}916			}917			TransactionOutcome::Commit(Ok(()))918		})?;919920		<TokensMinted<T>>::insert(collection.id, tokens_minted);921922		for (account, balance) in balances {923			<AccountBalance<T>>::insert((collection.id, account), balance);924		}925926		for (i, token) in data.into_iter().enumerate() {927			let token_id = first_token_id + i as u32 + 1;928929			for (user, amount) in token.users.into_iter() {930				if amount == 0 {931					continue;932				}933934				<PalletEvm<T>>::deposit_log(935					ERC20Events::Transfer {936						from: H160::default(),937						to: *user.as_eth(),938						value: amount.into(),939					}940					.to_log(T::EvmTokenAddressMapping::token_to_address(941						collection.id,942						TokenId(token_id),943					)),944				);945				<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(946					collection.id,947					TokenId(token_id),948					user,949					amount,950				));951			}952		}953		Ok(())954	}955956	pub fn set_allowance_unchecked(957		collection: &RefungibleHandle<T>,958		sender: &T::CrossAccountId,959		spender: &T::CrossAccountId,960		token: TokenId,961		amount: u128,962	) {963		if amount == 0 {964			<Allowance<T>>::remove((collection.id, token, sender, spender));965		} else {966			<Allowance<T>>::insert((collection.id, token, sender, spender), amount);967		}968969		<PalletEvm<T>>::deposit_log(970			ERC20Events::Approval {971				owner: *sender.as_eth(),972				spender: *spender.as_eth(),973				value: amount.into(),974			}975			.to_log(T::EvmTokenAddressMapping::token_to_address(976				collection.id,977				token,978			)),979		);980		<PalletCommon<T>>::deposit_event(CommonEvent::Approved(981			collection.id,982			token,983			sender.clone(),984			spender.clone(),985			amount,986		))987	}988989	/// Set allowance for the spender to `transfer` or `burn` sender's token pieces.990	///991	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.992	pub fn set_allowance(993		collection: &RefungibleHandle<T>,994		sender: &T::CrossAccountId,995		spender: &T::CrossAccountId,996		token: TokenId,997		amount: u128,998	) -> DispatchResult {999		if collection.permissions.access() == AccessMode::AllowList {1000			collection.check_allowlist(sender)?;1001			collection.check_allowlist(spender)?;1002		}10031004		<PalletCommon<T>>::ensure_correct_receiver(spender)?;10051006		if <Balance<T>>::get((collection.id, token, sender)) < amount {1007			ensure!(1008				collection.ignores_owned_amount(sender) && Self::token_exists(collection, token),1009				<CommonError<T>>::CantApproveMoreThanOwned1010			);1011		}10121013		// =========10141015		Self::set_allowance_unchecked(collection, sender, spender, token, amount);1016		Ok(())1017	}10181019	/// Returns allowance, which should be set after transaction1020	fn check_allowed(1021		collection: &RefungibleHandle<T>,1022		spender: &T::CrossAccountId,1023		from: &T::CrossAccountId,1024		token: TokenId,1025		amount: u128,1026		nesting_budget: &dyn Budget,1027	) -> Result<Option<u128>, DispatchError> {1028		if spender.conv_eq(from) {1029			return Ok(None);1030		}1031		if collection.permissions.access() == AccessMode::AllowList {1032			// `from`, `to` checked in [`transfer`]1033			collection.check_allowlist(spender)?;1034		}1035		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1036			// TODO: should collection owner be allowed to perform this transfer?1037			ensure!(1038				<PalletStructure<T>>::check_indirectly_owned(1039					spender.clone(),1040					source.0,1041					source.1,1042					None,1043					nesting_budget1044				)?,1045				<CommonError<T>>::ApprovedValueTooLow,1046			);1047			return Ok(None);1048		}1049		let allowance =1050			<Allowance<T>>::get((collection.id, token, from, &spender)).checked_sub(amount);1051		if allowance.is_none() {1052			ensure!(1053				collection.ignores_allowance(spender),1054				<CommonError<T>>::ApprovedValueTooLow1055			);1056		}1057		Ok(allowance)1058	}10591060	/// Transfer RFT token pieces from one account to another.1061	///1062	/// Same as the [`transfer`] but spender doesn't needs to be an owner of the token pieces.1063	/// The owner should set allowance for the spender to transfer pieces.1064	///1065	/// [`transfer`]: struct.Pallet.html#method.transfer1066	pub fn transfer_from(1067		collection: &RefungibleHandle<T>,1068		spender: &T::CrossAccountId,1069		from: &T::CrossAccountId,1070		to: &T::CrossAccountId,1071		token: TokenId,1072		amount: u128,1073		nesting_budget: &dyn Budget,1074	) -> DispatchResult {1075		let allowance =1076			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;10771078		// =========10791080		Self::transfer(collection, from, to, token, amount, nesting_budget)?;1081		if let Some(allowance) = allowance {1082			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1083		}1084		Ok(())1085	}10861087	/// Burn RFT token pieces from the account.1088	///1089	/// Same as the [`burn`] but spender doesn't need to be an owner of the token pieces. The owner should1090	/// set allowance for the spender to burn pieces1091	///1092	/// [`burn`]: struct.Pallet.html#method.burn1093	pub fn burn_from(1094		collection: &RefungibleHandle<T>,1095		spender: &T::CrossAccountId,1096		from: &T::CrossAccountId,1097		token: TokenId,1098		amount: u128,1099		nesting_budget: &dyn Budget,1100	) -> DispatchResult {1101		let allowance =1102			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;11031104		// =========11051106		Self::burn(collection, from, token, amount)?;1107		if let Some(allowance) = allowance {1108			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1109		}1110		Ok(())1111	}11121113	/// Create RFT token.1114	///1115	/// The sender should be the owner/admin of the collection or collection should be configured1116	/// to allow public minting.1117	///1118	/// - `data`: Contains list of users who will become the owners of the token pieces and amount1119	///   of token pieces they will receive.1120	pub fn create_item(1121		collection: &RefungibleHandle<T>,1122		sender: &T::CrossAccountId,1123		data: CreateRefungibleExData<T::CrossAccountId>,1124		nesting_budget: &dyn Budget,1125	) -> DispatchResult {1126		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1127	}11281129	/// Repartition RFT token.1130	///1131	/// `repartition` will set token balance of the sender and total amount of token pieces.1132	/// Sender should own all of the token pieces. `repartition' could be done even if some1133	/// token pieces were burned before.1134	///1135	/// - `amount`: Total amount of token pieces that the token will have after `repartition`.1136	pub fn repartition(1137		collection: &RefungibleHandle<T>,1138		owner: &T::CrossAccountId,1139		token: TokenId,1140		amount: u128,1141	) -> DispatchResult {1142		ensure!(1143			amount <= MAX_REFUNGIBLE_PIECES,1144			<Error<T>>::WrongRefungiblePieces1145		);1146		ensure!(amount > 0, <CommonError<T>>::TokenValueTooLow);1147		// Ensure user owns all pieces1148		let total_pieces = Self::total_pieces(collection.id, token).unwrap_or(u128::MAX);1149		let balance = <Balance<T>>::get((collection.id, token, owner));1150		ensure!(1151			total_pieces == balance,1152			<Error<T>>::RepartitionWhileNotOwningAllPieces1153		);11541155		<Balance<T>>::insert((collection.id, token, owner), amount);1156		<TotalSupply<T>>::insert((collection.id, token), amount);11571158		if amount > total_pieces {1159			let mint_amount = amount - total_pieces;1160			<PalletEvm<T>>::deposit_log(1161				ERC20Events::Transfer {1162					from: H160::default(),1163					to: *owner.as_eth(),1164					value: mint_amount.into(),1165				}1166				.to_log(T::EvmTokenAddressMapping::token_to_address(1167					collection.id,1168					token,1169				)),1170			);1171			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1172				collection.id,1173				token,1174				owner.clone(),1175				mint_amount,1176			));1177		} else if total_pieces > amount {1178			let burn_amount = total_pieces - amount;1179			<PalletEvm<T>>::deposit_log(1180				ERC20Events::Transfer {1181					from: *owner.as_eth(),1182					to: H160::default(),1183					value: burn_amount.into(),1184				}1185				.to_log(T::EvmTokenAddressMapping::token_to_address(1186					collection.id,1187					token,1188				)),1189			);1190			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(1191				collection.id,1192				token,1193				owner.clone(),1194				burn_amount,1195			));1196		}11971198		Ok(())1199	}12001201	fn token_owner(collection_id: CollectionId, token_id: TokenId) -> Option<T::CrossAccountId> {1202		let mut owner = None;1203		let mut count = 0;1204		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {1205			count += 1;1206			if count > 1 {1207				return None;1208			}1209			owner = Some(key);1210		}1211		owner1212	}12131214	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {1215		<TotalSupply<T>>::try_get((collection_id, token_id)).ok()1216	}12171218	pub fn set_collection_properties(1219		collection: &RefungibleHandle<T>,1220		sender: &T::CrossAccountId,1221		properties: Vec<Property>,1222	) -> DispatchResult {1223		<PalletCommon<T>>::set_collection_properties(collection, sender, properties)1224	}12251226	pub fn delete_collection_properties(1227		collection: &RefungibleHandle<T>,1228		sender: &T::CrossAccountId,1229		property_keys: Vec<PropertyKey>,1230	) -> DispatchResult {1231		<PalletCommon<T>>::delete_collection_properties(collection, sender, property_keys)1232	}12331234	pub fn set_token_property_permissions(1235		collection: &RefungibleHandle<T>,1236		sender: &T::CrossAccountId,1237		property_permissions: Vec<PropertyKeyPermission>,1238	) -> DispatchResult {1239		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)1240	}12411242	/// Returns 10 token in no particular order.1243	///1244	/// There is no direct way to get token holders in ascending order,1245	/// since `iter_prefix` returns values in no particular order.1246	/// Therefore, getting the 10 largest holders with a large value of holders1247	/// can lead to impact memory allocation + sorting with  `n * log (n)`.1248	pub fn token_owners(1249		collection_id: CollectionId,1250		token: TokenId,1251	) -> Option<Vec<T::CrossAccountId>> {1252		let res: Vec<T::CrossAccountId> = <Balance<T>>::iter_prefix((collection_id, token))1253			.map(|(owner, _amount)| owner)1254			.take(10)1255			.collect();12561257		if res.is_empty() {1258			None1259		} else {1260			Some(res)1261		}1262	}1263}