git.delta.rocks / unique-network / refs/commits / 017086424d43

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	/// A batch operation to add, edit or remove properties for a token.519	/// It sets or removes a token's properties according to520	/// `properties_updates` contents:521	/// * sets a property under the <key> with the value provided `(<key>, Some(<value>))`522	/// * removes a property under the <key> if the value is `None` `(<key>, None)`.523	///524	/// - `nesting_budget`: Limit for searching parents in-depth to check ownership.525	/// - `is_token_create`: Indicates that method is called during token initialization.526	///   Allows to bypass ownership check.527	///528	/// All affected properties should have `mutable` permission529	/// to be **deleted** or to be **set more than once**,530	/// and the sender should have permission to edit those properties.531	///532	/// This function fires an event for each property change.533	/// In case of an error, all the changes (including the events) will be reverted534	/// since the function is transactional.535	#[transactional]536	fn modify_token_properties(537		collection: &RefungibleHandle<T>,538		sender: &T::CrossAccountId,539		token_id: TokenId,540		properties_updates: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,541		is_token_create: bool,542		nesting_budget: &dyn Budget,543	) -> DispatchResult {544		let is_collection_admin = || collection.is_owner_or_admin(sender);545		let is_token_owner = || -> Result<bool, DispatchError> {546			let balance = collection.balance(sender.clone(), token_id);547			let total_pieces: u128 =548				Self::total_pieces(collection.id, token_id).unwrap_or(u128::MAX);549			if balance != total_pieces {550				return Ok(false);551			}552553			let is_bundle_owner = <PalletStructure<T>>::check_indirectly_owned(554				sender.clone(),555				collection.id,556				token_id,557				None,558				nesting_budget,559			)?;560561			Ok(is_bundle_owner)562		};563564		let mut stored_properties = <TokenProperties<T>>::get((collection.id, token_id));565		let permissions = <PalletCommon<T>>::property_permissions(collection.id);566567		for (key, value) in properties_updates {568			let permission = permissions569				.get(&key)570				.cloned()571				.unwrap_or_else(PropertyPermission::none);572573			let is_property_exists = stored_properties.get(&key).is_some();574575			match permission {576				PropertyPermission { mutable: false, .. } if is_property_exists => {577					return Err(<CommonError<T>>::NoPermission.into());578				}579580				PropertyPermission {581					collection_admin,582					token_owner,583					..584				} => {585					//TODO: investigate threats during public minting.586					let is_token_create =587						is_token_create && (collection_admin || token_owner) && value.is_some();588					if !(is_token_create589						|| (collection_admin && is_collection_admin())590						|| (token_owner && is_token_owner()?))591					{592						fail!(<CommonError<T>>::NoPermission);593					}594				}595			}596597			match value {598				Some(value) => {599					stored_properties600						.try_set(key.clone(), value)601						.map_err(<CommonError<T>>::from)?;602603					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(604						collection.id,605						token_id,606						key,607					));608				}609				None => {610					stored_properties611						.remove(&key)612						.map_err(<CommonError<T>>::from)?;613614					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(615						collection.id,616						token_id,617						key,618					));619				}620			}621622			<PalletEvm<T>>::deposit_log(623				CollectionHelpersEvents::TokenChanged {624					collection_id: collection_id_to_address(collection.id),625					token_id: token_id.into(),626				}627				.to_log(T::ContractAddress::get()),628			);629		}630631		<TokenProperties<T>>::set((collection.id, token_id), stored_properties);632633		Ok(())634	}635636	pub fn set_token_properties(637		collection: &RefungibleHandle<T>,638		sender: &T::CrossAccountId,639		token_id: TokenId,640		properties: impl Iterator<Item = Property>,641		is_token_create: bool,642		nesting_budget: &dyn Budget,643	) -> DispatchResult {644		Self::modify_token_properties(645			collection,646			sender,647			token_id,648			properties.map(|p| (p.key, Some(p.value))),649			is_token_create,650			nesting_budget,651		)652	}653654	pub fn set_token_property(655		collection: &RefungibleHandle<T>,656		sender: &T::CrossAccountId,657		token_id: TokenId,658		property: Property,659		nesting_budget: &dyn Budget,660	) -> DispatchResult {661		let is_token_create = false;662663		Self::set_token_properties(664			collection,665			sender,666			token_id,667			[property].into_iter(),668			is_token_create,669			nesting_budget,670		)671	}672673	pub fn delete_token_properties(674		collection: &RefungibleHandle<T>,675		sender: &T::CrossAccountId,676		token_id: TokenId,677		property_keys: impl Iterator<Item = PropertyKey>,678		nesting_budget: &dyn Budget,679	) -> DispatchResult {680		let is_token_create = false;681682		Self::modify_token_properties(683			collection,684			sender,685			token_id,686			property_keys.into_iter().map(|key| (key, None)),687			is_token_create,688			nesting_budget,689		)690	}691692	pub fn delete_token_property(693		collection: &RefungibleHandle<T>,694		sender: &T::CrossAccountId,695		token_id: TokenId,696		property_key: PropertyKey,697		nesting_budget: &dyn Budget,698	) -> DispatchResult {699		Self::delete_token_properties(700			collection,701			sender,702			token_id,703			[property_key].into_iter(),704			nesting_budget,705		)706	}707708	/// Transfer RFT token pieces from one account to another.709	///710	/// If the sender is no longer owns any pieces after the `transfer` than she stops being an owner of the token.711	///712	/// - `from`: Owner of token pieces to transfer.713	/// - `to`: Recepient of transfered token pieces.714	/// - `amount`: Amount of token pieces to transfer.715	/// - `token`: Token whos pieces should be transfered716	/// - `collection`: Collection that contains the token717	pub fn transfer(718		collection: &RefungibleHandle<T>,719		from: &T::CrossAccountId,720		to: &T::CrossAccountId,721		token: TokenId,722		amount: u128,723		nesting_budget: &dyn Budget,724	) -> DispatchResult {725		ensure!(726			collection.limits.transfers_enabled(),727			<CommonError<T>>::TransferNotAllowed728		);729730		if collection.permissions.access() == AccessMode::AllowList {731			collection.check_allowlist(from)?;732			collection.check_allowlist(to)?;733		}734		<PalletCommon<T>>::ensure_correct_receiver(to)?;735736		let initial_balance_from = <Balance<T>>::get((collection.id, token, from));737738		if initial_balance_from == 0 {739			return Err(<CommonError<T>>::TokenValueTooLow.into());740		}741742		let updated_balance_from = initial_balance_from743			.checked_sub(amount)744			.ok_or(<CommonError<T>>::TokenValueTooLow)?;745		let mut create_target = false;746		let from_to_differ = from != to;747		let updated_balance_to = if from != to && amount != 0 {748			let old_balance = <Balance<T>>::get((collection.id, token, to));749			if old_balance == 0 {750				create_target = true;751			}752			Some(753				old_balance754					.checked_add(amount)755					.ok_or(ArithmeticError::Overflow)?,756			)757		} else {758			None759		};760761		let account_balance_from = if updated_balance_from == 0 {762			Some(763				<AccountBalance<T>>::get((collection.id, from))764					.checked_sub(1)765					// Should not occur766					.ok_or(ArithmeticError::Underflow)?,767			)768		} else {769			None770		};771		// Account data is created in token, AccountBalance should be increased772		// But only if from != to as we shouldn't check overflow in this case773		let account_balance_to = if create_target && from_to_differ {774			let account_balance_to = <AccountBalance<T>>::get((collection.id, to))775				.checked_add(1)776				.ok_or(ArithmeticError::Overflow)?;777			ensure!(778				account_balance_to < collection.limits.account_token_ownership_limit(),779				<CommonError<T>>::AccountTokenLimitExceeded,780			);781782			Some(account_balance_to)783		} else {784			None785		};786787		// =========788789		if let Some(updated_balance_to) = updated_balance_to {790			// from != to && amount != 0791792			<PalletStructure<T>>::nest_if_sent_to_token(793				from.clone(),794				to,795				collection.id,796				token,797				nesting_budget,798			)?;799800			if updated_balance_from == 0 {801				<Balance<T>>::remove((collection.id, token, from));802				<PalletStructure<T>>::unnest_if_nested(from, collection.id, token);803			} else {804				<Balance<T>>::insert((collection.id, token, from), updated_balance_from);805			}806			<Balance<T>>::insert((collection.id, token, to), updated_balance_to);807			if let Some(account_balance_from) = account_balance_from {808				<AccountBalance<T>>::insert((collection.id, from), account_balance_from);809				<Owned<T>>::remove((collection.id, from, token));810			}811			if let Some(account_balance_to) = account_balance_to {812				<AccountBalance<T>>::insert((collection.id, to), account_balance_to);813				<Owned<T>>::insert((collection.id, to, token), true);814			}815		}816817		<PalletEvm<T>>::deposit_log(818			ERC20Events::Transfer {819				from: *from.as_eth(),820				to: *to.as_eth(),821				value: amount.into(),822			}823			.to_log(T::EvmTokenAddressMapping::token_to_address(824				collection.id,825				token,826			)),827		);828829		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(830			collection.id,831			token,832			from.clone(),833			to.clone(),834			amount,835		));836837		let total_supply = <TotalSupply<T>>::get((collection.id, token));838839		if amount == total_supply {840			// if token was fully owned by `from` and will be fully owned by `to` after transfer841			<PalletEvm<T>>::deposit_log(842				ERC721Events::Transfer {843					from: *from.as_eth(),844					to: *to.as_eth(),845					token_id: token.into(),846				}847				.to_log(collection_id_to_address(collection.id)),848			);849		} else if let Some(updated_balance_to) = updated_balance_to {850			// if `from` not equals `to`. This condition is needed to avoid sending event851			// when `from` fully owns token and sends part of token pieces to itself.852			if initial_balance_from == total_supply {853				// if token was fully owned by `from` and will be only partially owned by `to`854				// and `from` after transfer855				<PalletEvm<T>>::deposit_log(856					ERC721Events::Transfer {857						from: *from.as_eth(),858						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,859						token_id: token.into(),860					}861					.to_log(collection_id_to_address(collection.id)),862				);863			} else if updated_balance_to == total_supply {864				// if token was partially owned by `from` and will be fully owned by `to` after transfer865				<PalletEvm<T>>::deposit_log(866					ERC721Events::Transfer {867						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,868						to: *to.as_eth(),869						token_id: token.into(),870					}871					.to_log(collection_id_to_address(collection.id)),872				);873			}874		}875876		Ok(())877	}878879	/// Batched operation to create multiple RFT tokens.880	///881	/// Same as `create_item` but creates multiple tokens.882	///883	/// - `data`: Same as 'data` in `create_item` but contains data for multiple tokens.884	pub fn create_multiple_items(885		collection: &RefungibleHandle<T>,886		sender: &T::CrossAccountId,887		data: Vec<CreateItemData<T>>,888		nesting_budget: &dyn Budget,889	) -> DispatchResult {890		if !collection.is_owner_or_admin(sender) {891			ensure!(892				collection.permissions.mint_mode(),893				<CommonError<T>>::PublicMintingNotAllowed894			);895			collection.check_allowlist(sender)?;896897			for item in data.iter() {898				for user in item.users.keys() {899					collection.check_allowlist(user)?;900				}901			}902		}903904		for item in data.iter() {905			for (owner, _) in item.users.iter() {906				<PalletCommon<T>>::ensure_correct_receiver(owner)?;907			}908		}909910		// Total pieces per tokens911		let totals = data912			.iter()913			.map(|data| {914				Ok(data915					.users916					.iter()917					.map(|u| u.1)918					.try_fold(0u128, |acc, v| acc.checked_add(*v))919					.ok_or(ArithmeticError::Overflow)?)920			})921			.collect::<Result<Vec<_>, DispatchError>>()?;922		for total in &totals {923			ensure!(924				*total <= MAX_REFUNGIBLE_PIECES,925				<Error<T>>::WrongRefungiblePieces926			);927		}928929		let first_token_id = <TokensMinted<T>>::get(collection.id);930		let tokens_minted = first_token_id931			.checked_add(data.len() as u32)932			.ok_or(ArithmeticError::Overflow)?;933		ensure!(934			tokens_minted < collection.limits.token_limit(),935			<CommonError<T>>::CollectionTokenLimitExceeded936		);937938		let mut balances = BTreeMap::new();939		for data in &data {940			for owner in data.users.keys() {941				let balance = balances942					.entry(owner)943					.or_insert_with(|| <AccountBalance<T>>::get((collection.id, owner)));944				*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;945946				ensure!(947					*balance <= collection.limits.account_token_ownership_limit(),948					<CommonError<T>>::AccountTokenLimitExceeded,949				);950			}951		}952953		for (i, token) in data.iter().enumerate() {954			let token_id = TokenId(first_token_id + i as u32 + 1);955			for (to, _) in token.users.iter() {956				<PalletStructure<T>>::check_nesting(957					sender.clone(),958					to,959					collection.id,960					token_id,961					nesting_budget,962				)?;963			}964		}965966		// =========967968		with_transaction(|| {969			for (i, data) in data.iter().enumerate() {970				let token_id = first_token_id + i as u32 + 1;971				<TotalSupply<T>>::insert((collection.id, token_id), totals[i]);972973				for (user, amount) in data.users.iter() {974					if *amount == 0 {975						continue;976					}977					<Balance<T>>::insert((collection.id, token_id, &user), amount);978					<Owned<T>>::insert((collection.id, &user, TokenId(token_id)), true);979					<PalletStructure<T>>::nest_if_sent_to_token_unchecked(980						user,981						collection.id,982						TokenId(token_id),983					);984				}985986				if let Err(e) = Self::set_token_properties(987					collection,988					sender,989					TokenId(token_id),990					data.properties.clone().into_iter(),991					true,992					nesting_budget,993				) {994					return TransactionOutcome::Rollback(Err(e));995				}996			}997			TransactionOutcome::Commit(Ok(()))998		})?;9991000		<TokensMinted<T>>::insert(collection.id, tokens_minted);10011002		for (account, balance) in balances {1003			<AccountBalance<T>>::insert((collection.id, account), balance);1004		}10051006		for (i, token) in data.into_iter().enumerate() {1007			let token_id = first_token_id + i as u32 + 1;10081009			let receivers = token1010				.users1011				.into_iter()1012				.filter(|(_, amount)| *amount > 0)1013				.collect::<Vec<_>>();10141015			if let [(user, _)] = receivers.as_slice() {1016				// if there is exactly one receiver1017				<PalletEvm<T>>::deposit_log(1018					ERC721Events::Transfer {1019						from: H160::default(),1020						to: *user.as_eth(),1021						token_id: token_id.into(),1022					}1023					.to_log(collection_id_to_address(collection.id)),1024				);1025			} else if let [_, ..] = receivers.as_slice() {1026				// if there is more than one receiver1027				<PalletEvm<T>>::deposit_log(1028					ERC721Events::Transfer {1029						from: H160::default(),1030						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,1031						token_id: token_id.into(),1032					}1033					.to_log(collection_id_to_address(collection.id)),1034				);1035			}10361037			for (user, amount) in receivers.into_iter() {1038				<PalletEvm<T>>::deposit_log(1039					ERC20Events::Transfer {1040						from: H160::default(),1041						to: *user.as_eth(),1042						value: amount.into(),1043					}1044					.to_log(T::EvmTokenAddressMapping::token_to_address(1045						collection.id,1046						TokenId(token_id),1047					)),1048				);1049				<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1050					collection.id,1051					TokenId(token_id),1052					user,1053					amount,1054				));1055			}1056		}1057		Ok(())1058	}10591060	pub fn set_allowance_unchecked(1061		collection: &RefungibleHandle<T>,1062		sender: &T::CrossAccountId,1063		spender: &T::CrossAccountId,1064		token: TokenId,1065		amount: u128,1066	) {1067		if amount == 0 {1068			<Allowance<T>>::remove((collection.id, token, sender, spender));1069		} else {1070			<Allowance<T>>::insert((collection.id, token, sender, spender), amount);1071		}10721073		<PalletEvm<T>>::deposit_log(1074			ERC20Events::Approval {1075				owner: *sender.as_eth(),1076				spender: *spender.as_eth(),1077				value: amount.into(),1078			}1079			.to_log(T::EvmTokenAddressMapping::token_to_address(1080				collection.id,1081				token,1082			)),1083		);1084		<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1085			collection.id,1086			token,1087			sender.clone(),1088			spender.clone(),1089			amount,1090		))1091	}10921093	/// Set allowance for the spender to `transfer` or `burn` sender's token pieces.1094	///1095	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1096	pub fn set_allowance(1097		collection: &RefungibleHandle<T>,1098		sender: &T::CrossAccountId,1099		spender: &T::CrossAccountId,1100		token: TokenId,1101		amount: u128,1102	) -> DispatchResult {1103		if collection.permissions.access() == AccessMode::AllowList {1104			collection.check_allowlist(sender)?;1105			collection.check_allowlist(spender)?;1106		}11071108		<PalletCommon<T>>::ensure_correct_receiver(spender)?;11091110		if <Balance<T>>::get((collection.id, token, sender)) < amount {1111			ensure!(1112				collection.ignores_owned_amount(sender) && Self::token_exists(collection, token),1113				<CommonError<T>>::CantApproveMoreThanOwned1114			);1115		}11161117		// =========11181119		Self::set_allowance_unchecked(collection, sender, spender, token, amount);1120		Ok(())1121	}11221123	/// Set allowance to spend from sender's eth mirror1124	///1125	/// - `from`: Address of sender's eth mirror.1126	/// - `to`: Adress of spender.1127	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1128	pub fn set_allowance_from(1129		collection: &RefungibleHandle<T>,1130		sender: &T::CrossAccountId,1131		from: &T::CrossAccountId,1132		to: &T::CrossAccountId,1133		token_id: TokenId,1134		amount: u128,1135	) -> DispatchResult {1136		if collection.permissions.access() == AccessMode::AllowList {1137			collection.check_allowlist(sender)?;1138			collection.check_allowlist(from)?;1139			collection.check_allowlist(to)?;1140		}11411142		<PalletCommon<T>>::ensure_correct_receiver(to)?;11431144		ensure!(1145			sender.conv_eq(from),1146			<CommonError<T>>::AddressIsNotEthMirror1147		);11481149		if <Balance<T>>::get((collection.id, token_id, from)) < amount {1150			ensure!(1151				collection.limits.owner_can_transfer()1152					&& (collection.is_owner_or_admin(sender) || collection.is_owner_or_admin(from))1153					&& Self::token_exists(collection, token_id),1154				<CommonError<T>>::CantApproveMoreThanOwned1155			);1156		}11571158		// =========11591160		Self::set_allowance_unchecked(collection, from, to, token_id, amount);1161		Ok(())1162	}11631164	/// Returns allowance, which should be set after transaction1165	fn check_allowed(1166		collection: &RefungibleHandle<T>,1167		spender: &T::CrossAccountId,1168		from: &T::CrossAccountId,1169		token: TokenId,1170		amount: u128,1171		nesting_budget: &dyn Budget,1172	) -> Result<Option<u128>, DispatchError> {1173		if spender.conv_eq(from) {1174			return Ok(None);1175		}1176		if collection.permissions.access() == AccessMode::AllowList {1177			// `from`, `to` checked in [`transfer`]1178			collection.check_allowlist(spender)?;1179		}11801181		if collection.limits.owner_can_transfer() && collection.is_owner_or_admin(spender) {1182			return Ok(None);1183		}11841185		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1186			// TODO: should collection owner be allowed to perform this transfer?1187			ensure!(1188				<PalletStructure<T>>::check_indirectly_owned(1189					spender.clone(),1190					source.0,1191					source.1,1192					None,1193					nesting_budget1194				)?,1195				<CommonError<T>>::ApprovedValueTooLow,1196			);1197			return Ok(None);1198		}1199		let allowance =1200			<Allowance<T>>::get((collection.id, token, from, &spender)).checked_sub(amount);12011202		// Allowance (if any) would be reduced if spender is also wallet operator1203		if <CollectionAllowance<T>>::get((collection.id, from, spender)) {1204			return Ok(allowance);1205		}12061207		if allowance.is_none() {1208			ensure!(1209				collection.ignores_allowance(spender),1210				<CommonError<T>>::ApprovedValueTooLow1211			);1212		}1213		Ok(allowance)1214	}12151216	/// Transfer RFT token pieces from one account to another.1217	///1218	/// Same as the [`transfer`] but spender doesn't needs to be an owner of the token pieces.1219	/// The owner should set allowance for the spender to transfer pieces.1220	///1221	/// [`transfer`]: struct.Pallet.html#method.transfer1222	pub fn transfer_from(1223		collection: &RefungibleHandle<T>,1224		spender: &T::CrossAccountId,1225		from: &T::CrossAccountId,1226		to: &T::CrossAccountId,1227		token: TokenId,1228		amount: u128,1229		nesting_budget: &dyn Budget,1230	) -> DispatchResult {1231		let allowance =1232			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;12331234		// =========12351236		Self::transfer(collection, from, to, token, amount, nesting_budget)?;1237		if let Some(allowance) = allowance {1238			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1239		}1240		Ok(())1241	}12421243	/// Burn RFT token pieces from the account.1244	///1245	/// Same as the [`burn`] but spender doesn't need to be an owner of the token pieces. The owner should1246	/// set allowance for the spender to burn pieces1247	///1248	/// [`burn`]: struct.Pallet.html#method.burn1249	pub fn burn_from(1250		collection: &RefungibleHandle<T>,1251		spender: &T::CrossAccountId,1252		from: &T::CrossAccountId,1253		token: TokenId,1254		amount: u128,1255		nesting_budget: &dyn Budget,1256	) -> DispatchResult {1257		let allowance =1258			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;12591260		// =========12611262		Self::burn(collection, from, token, amount)?;1263		if let Some(allowance) = allowance {1264			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1265		}1266		Ok(())1267	}12681269	/// Create RFT token.1270	///1271	/// The sender should be the owner/admin of the collection or collection should be configured1272	/// to allow public minting.1273	///1274	/// - `data`: Contains list of users who will become the owners of the token pieces and amount1275	///   of token pieces they will receive.1276	pub fn create_item(1277		collection: &RefungibleHandle<T>,1278		sender: &T::CrossAccountId,1279		data: CreateItemData<T>,1280		nesting_budget: &dyn Budget,1281	) -> DispatchResult {1282		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1283	}12841285	/// Repartition RFT token.1286	///1287	/// `repartition` will set token balance of the sender and total amount of token pieces.1288	/// Sender should own all of the token pieces. `repartition' could be done even if some1289	/// token pieces were burned before.1290	///1291	/// - `amount`: Total amount of token pieces that the token will have after `repartition`.1292	pub fn repartition(1293		collection: &RefungibleHandle<T>,1294		owner: &T::CrossAccountId,1295		token: TokenId,1296		amount: u128,1297	) -> DispatchResult {1298		ensure!(1299			amount <= MAX_REFUNGIBLE_PIECES,1300			<Error<T>>::WrongRefungiblePieces1301		);1302		ensure!(amount > 0, <CommonError<T>>::TokenValueTooLow);1303		// Ensure user owns all pieces1304		let total_pieces = Self::total_pieces(collection.id, token).unwrap_or(u128::MAX);1305		let balance = <Balance<T>>::get((collection.id, token, owner));1306		ensure!(1307			total_pieces == balance,1308			<Error<T>>::RepartitionWhileNotOwningAllPieces1309		);13101311		<Balance<T>>::insert((collection.id, token, owner), amount);1312		<TotalSupply<T>>::insert((collection.id, token), amount);13131314		if amount > total_pieces {1315			let mint_amount = amount - total_pieces;1316			<PalletEvm<T>>::deposit_log(1317				ERC20Events::Transfer {1318					from: H160::default(),1319					to: *owner.as_eth(),1320					value: mint_amount.into(),1321				}1322				.to_log(T::EvmTokenAddressMapping::token_to_address(1323					collection.id,1324					token,1325				)),1326			);1327			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1328				collection.id,1329				token,1330				owner.clone(),1331				mint_amount,1332			));1333		} else if total_pieces > amount {1334			let burn_amount = total_pieces - amount;1335			<PalletEvm<T>>::deposit_log(1336				ERC20Events::Transfer {1337					from: *owner.as_eth(),1338					to: H160::default(),1339					value: burn_amount.into(),1340				}1341				.to_log(T::EvmTokenAddressMapping::token_to_address(1342					collection.id,1343					token,1344				)),1345			);1346			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(1347				collection.id,1348				token,1349				owner.clone(),1350				burn_amount,1351			));1352		}13531354		Ok(())1355	}13561357	fn token_owner(collection_id: CollectionId, token_id: TokenId) -> Option<T::CrossAccountId> {1358		let mut owner = None;1359		let mut count = 0;1360		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {1361			count += 1;1362			if count > 1 {1363				return None;1364			}1365			owner = Some(key);1366		}1367		owner1368	}13691370	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {1371		<TotalSupply<T>>::try_get((collection_id, token_id)).ok()1372	}13731374	pub fn set_collection_properties(1375		collection: &RefungibleHandle<T>,1376		sender: &T::CrossAccountId,1377		properties: Vec<Property>,1378	) -> DispatchResult {1379		<PalletCommon<T>>::set_collection_properties(collection, sender, properties.into_iter())1380	}13811382	pub fn delete_collection_properties(1383		collection: &RefungibleHandle<T>,1384		sender: &T::CrossAccountId,1385		property_keys: Vec<PropertyKey>,1386	) -> DispatchResult {1387		<PalletCommon<T>>::delete_collection_properties(1388			collection,1389			sender,1390			property_keys.into_iter(),1391		)1392	}13931394	pub fn set_token_property_permissions(1395		collection: &RefungibleHandle<T>,1396		sender: &T::CrossAccountId,1397		property_permissions: Vec<PropertyKeyPermission>,1398	) -> DispatchResult {1399		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)1400	}14011402	pub fn token_property_permission(collection_id: CollectionId) -> PropertiesPermissionMap {1403		<PalletCommon<T>>::property_permissions(collection_id)1404	}14051406	pub fn set_scoped_token_property_permissions(1407		collection: &RefungibleHandle<T>,1408		sender: &T::CrossAccountId,1409		scope: PropertyScope,1410		property_permissions: Vec<PropertyKeyPermission>,1411	) -> DispatchResult {1412		<PalletCommon<T>>::set_scoped_token_property_permissions(1413			collection,1414			sender,1415			scope,1416			property_permissions,1417		)1418	}14191420	/// Returns 10 token in no particular order.1421	///1422	/// There is no direct way to get token holders in ascending order,1423	/// since `iter_prefix` returns values in no particular order.1424	/// Therefore, getting the 10 largest holders with a large value of holders1425	/// can lead to impact memory allocation + sorting with  `n * log (n)`.1426	pub fn token_owners(1427		collection_id: CollectionId,1428		token: TokenId,1429	) -> Option<Vec<T::CrossAccountId>> {1430		let res: Vec<T::CrossAccountId> = <Balance<T>>::iter_prefix((collection_id, token))1431			.map(|(owner, _amount)| owner)1432			.take(10)1433			.collect();14341435		if res.is_empty() {1436			None1437		} else {1438			Some(res)1439		}1440	}14411442	/// Sets or unsets the approval of a given operator.1443	///1444	/// The `operator` is allowed to transfer all token pieces of the `owner` on their behalf.1445	/// - `owner`: Token owner1446	/// - `operator`: Operator1447	/// - `approve`: Should operator status be granted or revoked?1448	pub fn set_allowance_for_all(1449		collection: &RefungibleHandle<T>,1450		owner: &T::CrossAccountId,1451		operator: &T::CrossAccountId,1452		approve: bool,1453	) -> DispatchResult {1454		if collection.permissions.access() == AccessMode::AllowList {1455			collection.check_allowlist(owner)?;1456			collection.check_allowlist(operator)?;1457		}14581459		<PalletCommon<T>>::ensure_correct_receiver(operator)?;14601461		// =========14621463		<CollectionAllowance<T>>::insert((collection.id, owner, operator), approve);1464		<PalletEvm<T>>::deposit_log(1465			ERC721Events::ApprovalForAll {1466				owner: *owner.as_eth(),1467				operator: *operator.as_eth(),1468				approved: approve,1469			}1470			.to_log(collection_id_to_address(collection.id)),1471		);1472		<PalletCommon<T>>::deposit_event(CommonEvent::ApprovedForAll(1473			collection.id,1474			owner.clone(),1475			operator.clone(),1476			approve,1477		));1478		Ok(())1479	}14801481	/// Tells whether the given `owner` approves the `operator`.1482	pub fn allowance_for_all(1483		collection: &RefungibleHandle<T>,1484		owner: &T::CrossAccountId,1485		operator: &T::CrossAccountId,1486	) -> bool {1487		<CollectionAllowance<T>>::get((collection.id, owner, operator))1488	}14891490	pub fn repair_item(collection: &RefungibleHandle<T>, token: TokenId) -> DispatchResult {1491		<TokenProperties<T>>::mutate((collection.id, token), |properties| {1492			properties.recompute_consumed_space();1493		});14941495		Ok(())1496	}1497}