git.delta.rocks / unique-network / refs/commits / 0f4242c739ad

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;91use crate::erc::ERC721Events;9293use core::ops::Deref;94use evm_coder::ToLog;95use frame_support::{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, eth::collection_id_to_address,100	Event as CommonEvent, Pallet as PalletCommon, erc::CollectionHelpersEvents,101};102use pallet_structure::Pallet as PalletStructure;103use sp_core::{Get, 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, CollectionFlags, CreateCollectionData,108	mapping::TokenAddressMapping, MAX_REFUNGIBLE_PIECES, Property, PropertyKey,109	PropertyKeyPermission, PropertyPermission, PropertyScope, PropertyValue, TokenId,110	TrySetProperty, PropertiesPermissionMap, CreateRefungibleExMultipleOwners,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;120121pub type CreateItemData<T> =122	CreateRefungibleExMultipleOwners<<T as pallet_evm::Config>::CrossAccountId>;123pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;124125#[frame_support::pallet]126pub mod pallet {127	use super::*;128	use frame_support::{129		Blake2_128, Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key,130		traits::StorageVersion,131	};132	use up_data_structs::{CollectionId, TokenId};133	use super::weights::WeightInfo;134135	#[pallet::error]136	pub enum Error<T> {137		/// Not Refungible item data used to mint in Refungible collection.138		NotRefungibleDataUsedToMintFungibleCollectionToken,139		/// Maximum refungibility exceeded.140		WrongRefungiblePieces,141		/// Refungible token can't be repartitioned by user who isn't owns all pieces.142		RepartitionWhileNotOwningAllPieces,143		/// Refungible token can't nest other tokens.144		RefungibleDisallowsNesting,145		/// Setting item properties is not allowed.146		SettingPropertiesNotAllowed,147	}148149	#[pallet::config]150	pub trait Config:151		frame_system::Config + pallet_common::Config + pallet_structure::Config152	{153		type WeightInfo: WeightInfo;154	}155156	const STORAGE_VERSION: StorageVersion = StorageVersion::new(2);157158	#[pallet::pallet]159	#[pallet::storage_version(STORAGE_VERSION)]160	#[pallet::generate_store(pub(super) trait Store)]161	pub struct Pallet<T>(_);162163	/// Total amount of minted tokens in a collection.164	#[pallet::storage]165	pub type TokensMinted<T: Config> =166		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;167168	/// Amount of tokens burnt in a collection.169	#[pallet::storage]170	pub type TokensBurnt<T: Config> =171		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;172173	/// Amount of pieces a refungible token is split into.174	#[pallet::storage]175	#[pallet::getter(fn token_properties)]176	pub type TokenProperties<T: Config> = StorageNMap<177		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),178		Value = up_data_structs::Properties,179		QueryKind = ValueQuery,180		OnEmpty = up_data_structs::TokenProperties,181	>;182183	/// Total amount of pieces for token184	#[pallet::storage]185	pub type TotalSupply<T: Config> = StorageNMap<186		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),187		Value = u128,188		QueryKind = ValueQuery,189	>;190191	/// Used to enumerate tokens owned by account.192	#[pallet::storage]193	pub type Owned<T: Config> = StorageNMap<194		Key = (195			Key<Twox64Concat, CollectionId>,196			Key<Blake2_128Concat, T::CrossAccountId>,197			Key<Twox64Concat, TokenId>,198		),199		Value = bool,200		QueryKind = ValueQuery,201	>;202203	/// Amount of tokens (not pieces) partially owned by an account within a collection.204	#[pallet::storage]205	pub type AccountBalance<T: Config> = StorageNMap<206		Key = (207			Key<Twox64Concat, CollectionId>,208			// Owner209			Key<Blake2_128Concat, T::CrossAccountId>,210		),211		Value = u32,212		QueryKind = ValueQuery,213	>;214215	/// Amount of token pieces owned by account.216	#[pallet::storage]217	pub type Balance<T: Config> = StorageNMap<218		Key = (219			Key<Twox64Concat, CollectionId>,220			Key<Twox64Concat, TokenId>,221			// Owner222			Key<Blake2_128Concat, T::CrossAccountId>,223		),224		Value = u128,225		QueryKind = ValueQuery,226	>;227228	/// Allowance set by a token owner for another user to perform one of certain transactions on a number of pieces of a token.229	#[pallet::storage]230	pub type Allowance<T: Config> = StorageNMap<231		Key = (232			Key<Twox64Concat, CollectionId>,233			Key<Twox64Concat, TokenId>,234			// Owner235			Key<Blake2_128, T::CrossAccountId>,236			// Spender237			Key<Blake2_128Concat, T::CrossAccountId>,238		),239		Value = u128,240		QueryKind = ValueQuery,241	>;242243	/// Operator set by a wallet owner that could perform certain transactions on all tokens in the wallet.244	#[pallet::storage]245	pub type CollectionAllowance<T: Config> = StorageNMap<246		Key = (247			Key<Twox64Concat, CollectionId>,248			Key<Blake2_128Concat, T::CrossAccountId>,249			Key<Blake2_128Concat, T::CrossAccountId>,250		),251		Value = bool,252		QueryKind = ValueQuery,253	>;254}255256pub struct RefungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);257impl<T: Config> RefungibleHandle<T> {258	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {259		Self(inner)260	}261	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {262		self.0263	}264	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {265		&mut self.0266	}267}268269impl<T: Config> Deref for RefungibleHandle<T> {270	type Target = pallet_common::CollectionHandle<T>;271272	fn deref(&self) -> &Self::Target {273		&self.0274	}275}276277impl<T: Config> WithRecorder<T> for RefungibleHandle<T> {278	fn recorder(&self) -> &pallet_evm_coder_substrate::SubstrateRecorder<T> {279		self.0.recorder()280	}281	fn into_recorder(self) -> pallet_evm_coder_substrate::SubstrateRecorder<T> {282		self.0.into_recorder()283	}284}285286impl<T: Config> Pallet<T> {287	/// Get number of RFT tokens in collection288	pub fn total_supply(collection: &RefungibleHandle<T>) -> u32 {289		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)290	}291292	/// Check that RFT token exists293	///294	/// - `token`: Token ID.295	pub fn token_exists(collection: &RefungibleHandle<T>, token: TokenId) -> bool {296		<TotalSupply<T>>::contains_key((collection.id, token))297	}298299	pub fn set_scoped_token_property(300		collection_id: CollectionId,301		token_id: TokenId,302		scope: PropertyScope,303		property: Property,304	) -> DispatchResult {305		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {306			properties.try_scoped_set(scope, property.key, property.value)307		})308		.map_err(<CommonError<T>>::from)?;309310		Ok(())311	}312313	pub fn set_scoped_token_properties(314		collection_id: CollectionId,315		token_id: TokenId,316		scope: PropertyScope,317		properties: impl Iterator<Item = Property>,318	) -> DispatchResult {319		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {320			stored_properties.try_scoped_set_from_iter(scope, properties)321		})322		.map_err(<CommonError<T>>::from)?;323324		Ok(())325	}326}327328// unchecked calls skips any permission checks329impl<T: Config> Pallet<T> {330	/// Create RFT collection331	///332	/// `init_collection` will take non-refundable deposit for collection creation.333	///334	/// - `data`: Contains settings for collection limits and permissions.335	pub fn init_collection(336		owner: T::CrossAccountId,337		payer: T::CrossAccountId,338		data: CreateCollectionData<T::AccountId>,339		flags: CollectionFlags,340	) -> Result<CollectionId, DispatchError> {341		<PalletCommon<T>>::init_collection(owner, payer, data, flags)342	}343344	/// Destroy RFT collection345	///346	/// `destroy_collection` will throw error if collection contains any tokens.347	/// Only owner can destroy collection.348	pub fn destroy_collection(349		collection: RefungibleHandle<T>,350		sender: &T::CrossAccountId,351	) -> DispatchResult {352		let id = collection.id;353354		if Self::collection_has_tokens(id) {355			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());356		}357358		// =========359360		PalletCommon::destroy_collection(collection.0, sender)?;361362		<TokensMinted<T>>::remove(id);363		<TokensBurnt<T>>::remove(id);364		let _ = <TotalSupply<T>>::clear_prefix((id,), u32::MAX, None);365		let _ = <Balance<T>>::clear_prefix((id,), u32::MAX, None);366		let _ = <Allowance<T>>::clear_prefix((id,), u32::MAX, None);367		let _ = <Owned<T>>::clear_prefix((id,), u32::MAX, None);368		let _ = <AccountBalance<T>>::clear_prefix((id,), u32::MAX, None);369		Ok(())370	}371372	fn collection_has_tokens(collection_id: CollectionId) -> bool {373		<TotalSupply<T>>::iter_prefix((collection_id,))374			.next()375			.is_some()376	}377378	pub fn burn_token_unchecked(379		collection: &RefungibleHandle<T>,380		owner: &T::CrossAccountId,381		token_id: TokenId,382	) -> DispatchResult {383		let burnt = <TokensBurnt<T>>::get(collection.id)384			.checked_add(1)385			.ok_or(ArithmeticError::Overflow)?;386387		<TokensBurnt<T>>::insert(collection.id, burnt);388		<TokenProperties<T>>::remove((collection.id, token_id));389		<TotalSupply<T>>::remove((collection.id, token_id));390		let _ = <Balance<T>>::clear_prefix((collection.id, token_id), u32::MAX, None);391		let _ = <Allowance<T>>::clear_prefix((collection.id, token_id), u32::MAX, None);392		<PalletEvm<T>>::deposit_log(393			ERC721Events::Transfer {394				from: *owner.as_eth(),395				to: H160::default(),396				token_id: token_id.into(),397			}398			.to_log(collection_id_to_address(collection.id)),399		);400		Ok(())401	}402403	/// Burn RFT token pieces404	///405	/// `burn` will decrease total amount of token pieces and amount owned by sender.406	/// `burn` can be called even if there are multiple owners of the RFT token.407	/// If sender wouldn't have any pieces left after `burn` than she will stop being408	/// one of the owners of the token. If there is no account that owns any pieces of409	/// the token than token will be burned too.410	///411	/// - `amount`: Amount of token pieces to burn.412	/// - `token`: Token who's pieces should be burned413	/// - `collection`: Collection that contains the token414	pub fn burn(415		collection: &RefungibleHandle<T>,416		owner: &T::CrossAccountId,417		token: TokenId,418		amount: u128,419	) -> DispatchResult {420		if <Balance<T>>::get((collection.id, token, owner)) == 0 {421			return Err(<CommonError<T>>::TokenValueTooLow.into());422		}423424		let total_supply = <TotalSupply<T>>::get((collection.id, token))425			.checked_sub(amount)426			.ok_or(<CommonError<T>>::TokenValueTooLow)?;427428		// This was probally last owner of this token?429		if total_supply == 0 {430			// Ensure user actually owns this amount431			ensure!(432				<Balance<T>>::get((collection.id, token, owner)) == amount,433				<CommonError<T>>::TokenValueTooLow434			);435			let account_balance = <AccountBalance<T>>::get((collection.id, owner))436				.checked_sub(1)437				// Should not occur438				.ok_or(ArithmeticError::Underflow)?;439440			// =========441442			<Owned<T>>::remove((collection.id, owner, token));443			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);444			<AccountBalance<T>>::insert((collection.id, owner), account_balance);445			Self::burn_token_unchecked(collection, owner, token)?;446			<PalletEvm<T>>::deposit_log(447				ERC20Events::Transfer {448					from: *owner.as_eth(),449					to: H160::default(),450					value: amount.into(),451				}452				.to_log(collection_id_to_address(collection.id)),453			);454			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(455				collection.id,456				token,457				owner.clone(),458				amount,459			));460			return Ok(());461		}462463		let balance = <Balance<T>>::get((collection.id, token, owner))464			.checked_sub(amount)465			.ok_or(<CommonError<T>>::TokenValueTooLow)?;466		let account_balance = if balance == 0 {467			<AccountBalance<T>>::get((collection.id, owner))468				.checked_sub(1)469				// Should not occur470				.ok_or(ArithmeticError::Underflow)?471		} else {472			0473		};474475		// =========476477		if balance == 0 {478			<Owned<T>>::remove((collection.id, owner, token));479			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);480			<Balance<T>>::remove((collection.id, token, owner));481			<AccountBalance<T>>::insert((collection.id, owner), account_balance);482483			if let Some(user) = Self::token_owner(collection.id, token) {484				<PalletEvm<T>>::deposit_log(485					ERC721Events::Transfer {486						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,487						to: *user.as_eth(),488						token_id: token.into(),489					}490					.to_log(collection_id_to_address(collection.id)),491				);492			}493		} else {494			<Balance<T>>::insert((collection.id, token, owner), balance);495		}496		<TotalSupply<T>>::insert((collection.id, token), total_supply);497498		<PalletEvm<T>>::deposit_log(499			ERC20Events::Transfer {500				from: *owner.as_eth(),501				to: H160::default(),502				value: amount.into(),503			}504			.to_log(T::EvmTokenAddressMapping::token_to_address(505				collection.id,506				token,507			)),508		);509		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(510			collection.id,511			token,512			owner.clone(),513			amount,514		));515		Ok(())516	}517518	#[transactional]519	fn modify_token_properties(520		collection: &RefungibleHandle<T>,521		sender: &T::CrossAccountId,522		token_id: TokenId,523		properties: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,524		is_token_create: bool,525		nesting_budget: &dyn Budget,526	) -> DispatchResult {527		let is_collection_admin = || collection.is_owner_or_admin(sender);528		let is_token_owner = || -> Result<bool, DispatchError> {529			let balance = collection.balance(sender.clone(), token_id);530			let total_pieces: u128 =531				Self::total_pieces(collection.id, token_id).unwrap_or(u128::MAX);532			if balance != total_pieces {533				return Ok(false);534			}535536			let is_bundle_owner = <PalletStructure<T>>::check_indirectly_owned(537				sender.clone(),538				collection.id,539				token_id,540				None,541				nesting_budget,542			)?;543544			Ok(is_bundle_owner)545		};546547		for (key, value) in properties {548			let permission = <PalletCommon<T>>::property_permissions(collection.id)549				.get(&key)550				.cloned()551				.unwrap_or_else(PropertyPermission::none);552553			let is_property_exists = TokenProperties::<T>::get((collection.id, token_id))554				.get(&key)555				.is_some();556557			match permission {558				PropertyPermission { mutable: false, .. } if is_property_exists => {559					return Err(<CommonError<T>>::NoPermission.into());560				}561562				PropertyPermission {563					collection_admin,564					token_owner,565					..566				} => {567					//TODO: investigate threats during public minting.568					let is_token_create =569						is_token_create && (collection_admin || token_owner) && value.is_some();570					if !(is_token_create571						|| (collection_admin && is_collection_admin())572						|| (token_owner && is_token_owner()?))573					{574						fail!(<CommonError<T>>::NoPermission);575					}576				}577			}578579			match value {580				Some(value) => {581					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {582						properties.try_set(key.clone(), value)583					})584					.map_err(<CommonError<T>>::from)?;585586					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(587						collection.id,588						token_id,589						key,590					));591				}592				None => {593					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {594						properties.remove(&key)595					})596					.map_err(<CommonError<T>>::from)?;597598					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(599						collection.id,600						token_id,601						key,602					));603				}604			}605606			<PalletEvm<T>>::deposit_log(607				CollectionHelpersEvents::TokenChanged {608					collection_id: collection_id_to_address(collection.id),609					token_id: token_id.into(),610				}611				.to_log(T::ContractAddress::get()),612			);613		}614615		Ok(())616	}617618	pub fn set_token_properties(619		collection: &RefungibleHandle<T>,620		sender: &T::CrossAccountId,621		token_id: TokenId,622		properties: impl Iterator<Item = Property>,623		is_token_create: bool,624		nesting_budget: &dyn Budget,625	) -> DispatchResult {626		Self::modify_token_properties(627			collection,628			sender,629			token_id,630			properties.map(|p| (p.key, Some(p.value))),631			is_token_create,632			nesting_budget,633		)634	}635636	pub fn set_token_property(637		collection: &RefungibleHandle<T>,638		sender: &T::CrossAccountId,639		token_id: TokenId,640		property: Property,641		nesting_budget: &dyn Budget,642	) -> DispatchResult {643		let is_token_create = false;644645		Self::set_token_properties(646			collection,647			sender,648			token_id,649			[property].into_iter(),650			is_token_create,651			nesting_budget,652		)653	}654655	pub fn delete_token_properties(656		collection: &RefungibleHandle<T>,657		sender: &T::CrossAccountId,658		token_id: TokenId,659		property_keys: impl Iterator<Item = PropertyKey>,660		nesting_budget: &dyn Budget,661	) -> DispatchResult {662		let is_token_create = false;663664		Self::modify_token_properties(665			collection,666			sender,667			token_id,668			property_keys.into_iter().map(|key| (key, None)),669			is_token_create,670			nesting_budget,671		)672	}673674	pub fn delete_token_property(675		collection: &RefungibleHandle<T>,676		sender: &T::CrossAccountId,677		token_id: TokenId,678		property_key: PropertyKey,679		nesting_budget: &dyn Budget,680	) -> DispatchResult {681		Self::delete_token_properties(682			collection,683			sender,684			token_id,685			[property_key].into_iter(),686			nesting_budget,687		)688	}689690	/// Transfer RFT token pieces from one account to another.691	///692	/// If the sender is no longer owns any pieces after the `transfer` than she stops being an owner of the token.693	///694	/// - `from`: Owner of token pieces to transfer.695	/// - `to`: Recepient of transfered token pieces.696	/// - `amount`: Amount of token pieces to transfer.697	/// - `token`: Token whos pieces should be transfered698	/// - `collection`: Collection that contains the token699	pub fn transfer(700		collection: &RefungibleHandle<T>,701		from: &T::CrossAccountId,702		to: &T::CrossAccountId,703		token: TokenId,704		amount: u128,705		nesting_budget: &dyn Budget,706	) -> DispatchResult {707		ensure!(708			collection.limits.transfers_enabled(),709			<CommonError<T>>::TransferNotAllowed710		);711712		if collection.permissions.access() == AccessMode::AllowList {713			collection.check_allowlist(from)?;714			collection.check_allowlist(to)?;715		}716		<PalletCommon<T>>::ensure_correct_receiver(to)?;717718		let initial_balance_from = <Balance<T>>::get((collection.id, token, from));719720		if initial_balance_from == 0 {721			return Err(<CommonError<T>>::TokenValueTooLow.into());722		}723724		let updated_balance_from = initial_balance_from725			.checked_sub(amount)726			.ok_or(<CommonError<T>>::TokenValueTooLow)?;727		let mut create_target = false;728		let from_to_differ = from != to;729		let updated_balance_to = if from != to && amount != 0 {730			let old_balance = <Balance<T>>::get((collection.id, token, to));731			if old_balance == 0 {732				create_target = true;733			}734			Some(735				old_balance736					.checked_add(amount)737					.ok_or(ArithmeticError::Overflow)?,738			)739		} else {740			None741		};742743		let account_balance_from = if updated_balance_from == 0 {744			Some(745				<AccountBalance<T>>::get((collection.id, from))746					.checked_sub(1)747					// Should not occur748					.ok_or(ArithmeticError::Underflow)?,749			)750		} else {751			None752		};753		// Account data is created in token, AccountBalance should be increased754		// But only if from != to as we shouldn't check overflow in this case755		let account_balance_to = if create_target && from_to_differ {756			let account_balance_to = <AccountBalance<T>>::get((collection.id, to))757				.checked_add(1)758				.ok_or(ArithmeticError::Overflow)?;759			ensure!(760				account_balance_to < collection.limits.account_token_ownership_limit(),761				<CommonError<T>>::AccountTokenLimitExceeded,762			);763764			Some(account_balance_to)765		} else {766			None767		};768769		// =========770771		if let Some(updated_balance_to) = updated_balance_to {772			// from != to && amount != 0773774			<PalletStructure<T>>::nest_if_sent_to_token(775				from.clone(),776				to,777				collection.id,778				token,779				nesting_budget,780			)?;781782			if updated_balance_from == 0 {783				<Balance<T>>::remove((collection.id, token, from));784				<PalletStructure<T>>::unnest_if_nested(from, collection.id, token);785			} else {786				<Balance<T>>::insert((collection.id, token, from), updated_balance_from);787			}788			<Balance<T>>::insert((collection.id, token, to), updated_balance_to);789			if let Some(account_balance_from) = account_balance_from {790				<AccountBalance<T>>::insert((collection.id, from), account_balance_from);791				<Owned<T>>::remove((collection.id, from, token));792			}793			if let Some(account_balance_to) = account_balance_to {794				<AccountBalance<T>>::insert((collection.id, to), account_balance_to);795				<Owned<T>>::insert((collection.id, to, token), true);796			}797		}798799		<PalletEvm<T>>::deposit_log(800			ERC20Events::Transfer {801				from: *from.as_eth(),802				to: *to.as_eth(),803				value: amount.into(),804			}805			.to_log(T::EvmTokenAddressMapping::token_to_address(806				collection.id,807				token,808			)),809		);810811		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(812			collection.id,813			token,814			from.clone(),815			to.clone(),816			amount,817		));818819		let total_supply = <TotalSupply<T>>::get((collection.id, token));820821		if amount == total_supply {822			// if token was fully owned by `from` and will be fully owned by `to` after transfer823			<PalletEvm<T>>::deposit_log(824				ERC721Events::Transfer {825					from: *from.as_eth(),826					to: *to.as_eth(),827					token_id: token.into(),828				}829				.to_log(collection_id_to_address(collection.id)),830			);831		} else if let Some(updated_balance_to) = updated_balance_to {832			// if `from` not equals `to`. This condition is needed to avoid sending event833			// when `from` fully owns token and sends part of token pieces to itself.834			if initial_balance_from == total_supply {835				// if token was fully owned by `from` and will be only partially owned by `to`836				// and `from` after transfer837				<PalletEvm<T>>::deposit_log(838					ERC721Events::Transfer {839						from: *from.as_eth(),840						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,841						token_id: token.into(),842					}843					.to_log(collection_id_to_address(collection.id)),844				);845			} else if updated_balance_to == total_supply {846				// if token was partially owned by `from` and will be fully owned by `to` after transfer847				<PalletEvm<T>>::deposit_log(848					ERC721Events::Transfer {849						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,850						to: *to.as_eth(),851						token_id: token.into(),852					}853					.to_log(collection_id_to_address(collection.id)),854				);855			}856		}857858		Ok(())859	}860861	/// Batched operation to create multiple RFT tokens.862	///863	/// Same as `create_item` but creates multiple tokens.864	///865	/// - `data`: Same as 'data` in `create_item` but contains data for multiple tokens.866	pub fn create_multiple_items(867		collection: &RefungibleHandle<T>,868		sender: &T::CrossAccountId,869		data: Vec<CreateItemData<T>>,870		nesting_budget: &dyn Budget,871	) -> DispatchResult {872		if !collection.is_owner_or_admin(sender) {873			ensure!(874				collection.permissions.mint_mode(),875				<CommonError<T>>::PublicMintingNotAllowed876			);877			collection.check_allowlist(sender)?;878879			for item in data.iter() {880				for user in item.users.keys() {881					collection.check_allowlist(user)?;882				}883			}884		}885886		for item in data.iter() {887			for (owner, _) in item.users.iter() {888				<PalletCommon<T>>::ensure_correct_receiver(owner)?;889			}890		}891892		// Total pieces per tokens893		let totals = data894			.iter()895			.map(|data| {896				Ok(data897					.users898					.iter()899					.map(|u| u.1)900					.try_fold(0u128, |acc, v| acc.checked_add(*v))901					.ok_or(ArithmeticError::Overflow)?)902			})903			.collect::<Result<Vec<_>, DispatchError>>()?;904		for total in &totals {905			ensure!(906				*total <= MAX_REFUNGIBLE_PIECES,907				<Error<T>>::WrongRefungiblePieces908			);909		}910911		let first_token_id = <TokensMinted<T>>::get(collection.id);912		let tokens_minted = first_token_id913			.checked_add(data.len() as u32)914			.ok_or(ArithmeticError::Overflow)?;915		ensure!(916			tokens_minted < collection.limits.token_limit(),917			<CommonError<T>>::CollectionTokenLimitExceeded918		);919920		let mut balances = BTreeMap::new();921		for data in &data {922			for owner in data.users.keys() {923				let balance = balances924					.entry(owner)925					.or_insert_with(|| <AccountBalance<T>>::get((collection.id, owner)));926				*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;927928				ensure!(929					*balance <= collection.limits.account_token_ownership_limit(),930					<CommonError<T>>::AccountTokenLimitExceeded,931				);932			}933		}934935		for (i, token) in data.iter().enumerate() {936			let token_id = TokenId(first_token_id + i as u32 + 1);937			for (to, _) in token.users.iter() {938				<PalletStructure<T>>::check_nesting(939					sender.clone(),940					to,941					collection.id,942					token_id,943					nesting_budget,944				)?;945			}946		}947948		// =========949950		with_transaction(|| {951			for (i, data) in data.iter().enumerate() {952				let token_id = first_token_id + i as u32 + 1;953				<TotalSupply<T>>::insert((collection.id, token_id), totals[i]);954955				for (user, amount) in data.users.iter() {956					if *amount == 0 {957						continue;958					}959					<Balance<T>>::insert((collection.id, token_id, &user), amount);960					<Owned<T>>::insert((collection.id, &user, TokenId(token_id)), true);961					<PalletStructure<T>>::nest_if_sent_to_token_unchecked(962						user,963						collection.id,964						TokenId(token_id),965					);966				}967968				if let Err(e) = Self::set_token_properties(969					collection,970					sender,971					TokenId(token_id),972					data.properties.clone().into_iter(),973					true,974					nesting_budget,975				) {976					return TransactionOutcome::Rollback(Err(e));977				}978			}979			TransactionOutcome::Commit(Ok(()))980		})?;981982		<TokensMinted<T>>::insert(collection.id, tokens_minted);983984		for (account, balance) in balances {985			<AccountBalance<T>>::insert((collection.id, account), balance);986		}987988		for (i, token) in data.into_iter().enumerate() {989			let token_id = first_token_id + i as u32 + 1;990991			let receivers = token992				.users993				.into_iter()994				.filter(|(_, amount)| *amount > 0)995				.collect::<Vec<_>>();996997			if let [(user, _)] = receivers.as_slice() {998				// if there is exactly one receiver999				<PalletEvm<T>>::deposit_log(1000					ERC721Events::Transfer {1001						from: H160::default(),1002						to: *user.as_eth(),1003						token_id: token_id.into(),1004					}1005					.to_log(collection_id_to_address(collection.id)),1006				);1007			} else if let [_, ..] = receivers.as_slice() {1008				// if there is more than one receiver1009				<PalletEvm<T>>::deposit_log(1010					ERC721Events::Transfer {1011						from: H160::default(),1012						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,1013						token_id: token_id.into(),1014					}1015					.to_log(collection_id_to_address(collection.id)),1016				);1017			}10181019			for (user, amount) in receivers.into_iter() {1020				<PalletEvm<T>>::deposit_log(1021					ERC20Events::Transfer {1022						from: H160::default(),1023						to: *user.as_eth(),1024						value: amount.into(),1025					}1026					.to_log(T::EvmTokenAddressMapping::token_to_address(1027						collection.id,1028						TokenId(token_id),1029					)),1030				);1031				<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1032					collection.id,1033					TokenId(token_id),1034					user,1035					amount,1036				));1037			}1038		}1039		Ok(())1040	}10411042	pub fn set_allowance_unchecked(1043		collection: &RefungibleHandle<T>,1044		sender: &T::CrossAccountId,1045		spender: &T::CrossAccountId,1046		token: TokenId,1047		amount: u128,1048	) {1049		if amount == 0 {1050			<Allowance<T>>::remove((collection.id, token, sender, spender));1051		} else {1052			<Allowance<T>>::insert((collection.id, token, sender, spender), amount);1053		}10541055		<PalletEvm<T>>::deposit_log(1056			ERC20Events::Approval {1057				owner: *sender.as_eth(),1058				spender: *spender.as_eth(),1059				value: amount.into(),1060			}1061			.to_log(T::EvmTokenAddressMapping::token_to_address(1062				collection.id,1063				token,1064			)),1065		);1066		<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1067			collection.id,1068			token,1069			sender.clone(),1070			spender.clone(),1071			amount,1072		))1073	}10741075	/// Set allowance for the spender to `transfer` or `burn` sender's token pieces.1076	///1077	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1078	pub fn set_allowance(1079		collection: &RefungibleHandle<T>,1080		sender: &T::CrossAccountId,1081		spender: &T::CrossAccountId,1082		token: TokenId,1083		amount: u128,1084	) -> DispatchResult {1085		if collection.permissions.access() == AccessMode::AllowList {1086			collection.check_allowlist(sender)?;1087			collection.check_allowlist(spender)?;1088		}10891090		<PalletCommon<T>>::ensure_correct_receiver(spender)?;10911092		if <Balance<T>>::get((collection.id, token, sender)) < amount {1093			ensure!(1094				collection.ignores_owned_amount(sender) && Self::token_exists(collection, token),1095				<CommonError<T>>::CantApproveMoreThanOwned1096			);1097		}10981099		// =========11001101		Self::set_allowance_unchecked(collection, sender, spender, token, amount);1102		Ok(())1103	}11041105	/// Returns allowance, which should be set after transaction1106	fn check_allowed(1107		collection: &RefungibleHandle<T>,1108		spender: &T::CrossAccountId,1109		from: &T::CrossAccountId,1110		token: TokenId,1111		amount: u128,1112		nesting_budget: &dyn Budget,1113	) -> Result<Option<u128>, DispatchError> {1114		if spender.conv_eq(from) {1115			return Ok(None);1116		}1117		if collection.permissions.access() == AccessMode::AllowList {1118			// `from`, `to` checked in [`transfer`]1119			collection.check_allowlist(spender)?;1120		}1121		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1122			// TODO: should collection owner be allowed to perform this transfer?1123			ensure!(1124				<PalletStructure<T>>::check_indirectly_owned(1125					spender.clone(),1126					source.0,1127					source.1,1128					None,1129					nesting_budget1130				)?,1131				<CommonError<T>>::ApprovedValueTooLow,1132			);1133			return Ok(None);1134		}1135		let allowance =1136			<Allowance<T>>::get((collection.id, token, from, &spender)).checked_sub(amount);11371138		// Allowance (if any) would be reduced if spender is also wallet operator1139		if <CollectionAllowance<T>>::get((collection.id, from, spender)) {1140			return Ok(allowance);1141		}11421143		if allowance.is_none() {1144			ensure!(1145				collection.ignores_allowance(spender),1146				<CommonError<T>>::ApprovedValueTooLow1147			);1148		}1149		Ok(allowance)1150	}11511152	/// Transfer RFT token pieces from one account to another.1153	///1154	/// Same as the [`transfer`] but spender doesn't needs to be an owner of the token pieces.1155	/// The owner should set allowance for the spender to transfer pieces.1156	///1157	/// [`transfer`]: struct.Pallet.html#method.transfer1158	pub fn transfer_from(1159		collection: &RefungibleHandle<T>,1160		spender: &T::CrossAccountId,1161		from: &T::CrossAccountId,1162		to: &T::CrossAccountId,1163		token: TokenId,1164		amount: u128,1165		nesting_budget: &dyn Budget,1166	) -> DispatchResult {1167		let allowance =1168			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;11691170		// =========11711172		Self::transfer(collection, from, to, token, amount, nesting_budget)?;1173		if let Some(allowance) = allowance {1174			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1175		}1176		Ok(())1177	}11781179	/// Burn RFT token pieces from the account.1180	///1181	/// Same as the [`burn`] but spender doesn't need to be an owner of the token pieces. The owner should1182	/// set allowance for the spender to burn pieces1183	///1184	/// [`burn`]: struct.Pallet.html#method.burn1185	pub fn burn_from(1186		collection: &RefungibleHandle<T>,1187		spender: &T::CrossAccountId,1188		from: &T::CrossAccountId,1189		token: TokenId,1190		amount: u128,1191		nesting_budget: &dyn Budget,1192	) -> DispatchResult {1193		let allowance =1194			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;11951196		// =========11971198		Self::burn(collection, from, token, amount)?;1199		if let Some(allowance) = allowance {1200			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1201		}1202		Ok(())1203	}12041205	/// Create RFT token.1206	///1207	/// The sender should be the owner/admin of the collection or collection should be configured1208	/// to allow public minting.1209	///1210	/// - `data`: Contains list of users who will become the owners of the token pieces and amount1211	///   of token pieces they will receive.1212	pub fn create_item(1213		collection: &RefungibleHandle<T>,1214		sender: &T::CrossAccountId,1215		data: CreateItemData<T>,1216		nesting_budget: &dyn Budget,1217	) -> DispatchResult {1218		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1219	}12201221	/// Repartition RFT token.1222	///1223	/// `repartition` will set token balance of the sender and total amount of token pieces.1224	/// Sender should own all of the token pieces. `repartition' could be done even if some1225	/// token pieces were burned before.1226	///1227	/// - `amount`: Total amount of token pieces that the token will have after `repartition`.1228	pub fn repartition(1229		collection: &RefungibleHandle<T>,1230		owner: &T::CrossAccountId,1231		token: TokenId,1232		amount: u128,1233	) -> DispatchResult {1234		ensure!(1235			amount <= MAX_REFUNGIBLE_PIECES,1236			<Error<T>>::WrongRefungiblePieces1237		);1238		ensure!(amount > 0, <CommonError<T>>::TokenValueTooLow);1239		// Ensure user owns all pieces1240		let total_pieces = Self::total_pieces(collection.id, token).unwrap_or(u128::MAX);1241		let balance = <Balance<T>>::get((collection.id, token, owner));1242		ensure!(1243			total_pieces == balance,1244			<Error<T>>::RepartitionWhileNotOwningAllPieces1245		);12461247		<Balance<T>>::insert((collection.id, token, owner), amount);1248		<TotalSupply<T>>::insert((collection.id, token), amount);12491250		if amount > total_pieces {1251			let mint_amount = amount - total_pieces;1252			<PalletEvm<T>>::deposit_log(1253				ERC20Events::Transfer {1254					from: H160::default(),1255					to: *owner.as_eth(),1256					value: mint_amount.into(),1257				}1258				.to_log(T::EvmTokenAddressMapping::token_to_address(1259					collection.id,1260					token,1261				)),1262			);1263			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1264				collection.id,1265				token,1266				owner.clone(),1267				mint_amount,1268			));1269		} else if total_pieces > amount {1270			let burn_amount = total_pieces - amount;1271			<PalletEvm<T>>::deposit_log(1272				ERC20Events::Transfer {1273					from: *owner.as_eth(),1274					to: H160::default(),1275					value: burn_amount.into(),1276				}1277				.to_log(T::EvmTokenAddressMapping::token_to_address(1278					collection.id,1279					token,1280				)),1281			);1282			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(1283				collection.id,1284				token,1285				owner.clone(),1286				burn_amount,1287			));1288		}12891290		Ok(())1291	}12921293	fn token_owner(collection_id: CollectionId, token_id: TokenId) -> Option<T::CrossAccountId> {1294		let mut owner = None;1295		let mut count = 0;1296		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {1297			count += 1;1298			if count > 1 {1299				return None;1300			}1301			owner = Some(key);1302		}1303		owner1304	}13051306	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {1307		<TotalSupply<T>>::try_get((collection_id, token_id)).ok()1308	}13091310	pub fn set_collection_properties(1311		collection: &RefungibleHandle<T>,1312		sender: &T::CrossAccountId,1313		properties: Vec<Property>,1314	) -> DispatchResult {1315		<PalletCommon<T>>::set_collection_properties(collection, sender, properties)1316	}13171318	pub fn delete_collection_properties(1319		collection: &RefungibleHandle<T>,1320		sender: &T::CrossAccountId,1321		property_keys: Vec<PropertyKey>,1322	) -> DispatchResult {1323		<PalletCommon<T>>::delete_collection_properties(collection, sender, property_keys)1324	}13251326	pub fn set_token_property_permissions(1327		collection: &RefungibleHandle<T>,1328		sender: &T::CrossAccountId,1329		property_permissions: Vec<PropertyKeyPermission>,1330	) -> DispatchResult {1331		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)1332	}13331334	pub fn token_property_permission(collection_id: CollectionId) -> PropertiesPermissionMap {1335		<PalletCommon<T>>::property_permissions(collection_id)1336	}13371338	pub fn set_scoped_token_property_permissions(1339		collection: &RefungibleHandle<T>,1340		sender: &T::CrossAccountId,1341		scope: PropertyScope,1342		property_permissions: Vec<PropertyKeyPermission>,1343	) -> DispatchResult {1344		<PalletCommon<T>>::set_scoped_token_property_permissions(1345			collection,1346			sender,1347			scope,1348			property_permissions,1349		)1350	}13511352	/// Returns 10 token in no particular order.1353	///1354	/// There is no direct way to get token holders in ascending order,1355	/// since `iter_prefix` returns values in no particular order.1356	/// Therefore, getting the 10 largest holders with a large value of holders1357	/// can lead to impact memory allocation + sorting with  `n * log (n)`.1358	pub fn token_owners(1359		collection_id: CollectionId,1360		token: TokenId,1361	) -> Option<Vec<T::CrossAccountId>> {1362		let res: Vec<T::CrossAccountId> = <Balance<T>>::iter_prefix((collection_id, token))1363			.map(|(owner, _amount)| owner)1364			.take(10)1365			.collect();13661367		if res.is_empty() {1368			None1369		} else {1370			Some(res)1371		}1372	}13731374	/// Sets or unsets the approval of a given operator.1375	///1376	/// The `operator` is allowed to transfer all token pieces of the `owner` on their behalf.1377	/// - `owner`: Token owner1378	/// - `operator`: Operator1379	/// - `approve`: Should operator status be granted or revoked?1380	pub fn set_allowance_for_all(1381		collection: &RefungibleHandle<T>,1382		owner: &T::CrossAccountId,1383		operator: &T::CrossAccountId,1384		approve: bool,1385	) -> DispatchResult {1386		if collection.permissions.access() == AccessMode::AllowList {1387			collection.check_allowlist(owner)?;1388			collection.check_allowlist(operator)?;1389		}13901391		<PalletCommon<T>>::ensure_correct_receiver(operator)?;13921393		// =========13941395		<CollectionAllowance<T>>::insert((collection.id, owner, operator), approve);1396		<PalletEvm<T>>::deposit_log(1397			ERC721Events::ApprovalForAll {1398				owner: *owner.as_eth(),1399				operator: *operator.as_eth(),1400				approved: approve,1401			}1402			.to_log(collection_id_to_address(collection.id)),1403		);1404		<PalletCommon<T>>::deposit_event(CommonEvent::ApprovedForAll(1405			collection.id,1406			owner.clone(),1407			operator.clone(),1408			approve,1409		));1410		Ok(())1411	}14121413	/// Tells whether the given `owner` approves the `operator`.1414	pub fn allowance_for_all(1415		collection: &RefungibleHandle<T>,1416		owner: &T::CrossAccountId,1417		operator: &T::CrossAccountId,1418	) -> bool {1419		<CollectionAllowance<T>>::get((collection.id, owner, operator))1420	}14211422	pub fn repair_item(collection: &RefungibleHandle<T>, token: TokenId) -> DispatchResult {1423		<TokenProperties<T>>::mutate((collection.id, token), |properties| {1424			properties.recompute_consumed_space();1425		});14261427		Ok(())1428	}1429}