git.delta.rocks / unique-network / refs/commits / ad6ef77393cb

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_updates: 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		let mut stored_properties = <TokenProperties<T>>::get((collection.id, token_id));548		let permissions = <PalletCommon<T>>::property_permissions(collection.id);549550		for (key, value) in properties_updates {551			let permission = permissions552				.get(&key)553				.cloned()554				.unwrap_or_else(PropertyPermission::none);555556			let is_property_exists = stored_properties.get(&key).is_some();557558			match permission {559				PropertyPermission { mutable: false, .. } if is_property_exists => {560					return Err(<CommonError<T>>::NoPermission.into());561				}562563				PropertyPermission {564					collection_admin,565					token_owner,566					..567				} => {568					//TODO: investigate threats during public minting.569					let is_token_create =570						is_token_create && (collection_admin || token_owner) && value.is_some();571					if !(is_token_create572						|| (collection_admin && is_collection_admin())573						|| (token_owner && is_token_owner()?))574					{575						fail!(<CommonError<T>>::NoPermission);576					}577				}578			}579580			match value {581				Some(value) => {582					stored_properties583						.try_set(key.clone(), value)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					stored_properties594						.remove(&key)595						.map_err(<CommonError<T>>::from)?;596597					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(598						collection.id,599						token_id,600						key,601					));602				}603			}604605			<PalletEvm<T>>::deposit_log(606				CollectionHelpersEvents::TokenChanged {607					collection_id: collection_id_to_address(collection.id),608					token_id: token_id.into(),609				}610				.to_log(T::ContractAddress::get()),611			);612		}613614		<TokenProperties<T>>::mutate((collection.id, token_id), |properties| {615			*properties = stored_properties;616		});617618		Ok(())619	}620621	pub fn set_token_properties(622		collection: &RefungibleHandle<T>,623		sender: &T::CrossAccountId,624		token_id: TokenId,625		properties: impl Iterator<Item = Property>,626		is_token_create: bool,627		nesting_budget: &dyn Budget,628	) -> DispatchResult {629		Self::modify_token_properties(630			collection,631			sender,632			token_id,633			properties.map(|p| (p.key, Some(p.value))),634			is_token_create,635			nesting_budget,636		)637	}638639	pub fn set_token_property(640		collection: &RefungibleHandle<T>,641		sender: &T::CrossAccountId,642		token_id: TokenId,643		property: Property,644		nesting_budget: &dyn Budget,645	) -> DispatchResult {646		let is_token_create = false;647648		Self::set_token_properties(649			collection,650			sender,651			token_id,652			[property].into_iter(),653			is_token_create,654			nesting_budget,655		)656	}657658	pub fn delete_token_properties(659		collection: &RefungibleHandle<T>,660		sender: &T::CrossAccountId,661		token_id: TokenId,662		property_keys: impl Iterator<Item = PropertyKey>,663		nesting_budget: &dyn Budget,664	) -> DispatchResult {665		let is_token_create = false;666667		Self::modify_token_properties(668			collection,669			sender,670			token_id,671			property_keys.into_iter().map(|key| (key, None)),672			is_token_create,673			nesting_budget,674		)675	}676677	pub fn delete_token_property(678		collection: &RefungibleHandle<T>,679		sender: &T::CrossAccountId,680		token_id: TokenId,681		property_key: PropertyKey,682		nesting_budget: &dyn Budget,683	) -> DispatchResult {684		Self::delete_token_properties(685			collection,686			sender,687			token_id,688			[property_key].into_iter(),689			nesting_budget,690		)691	}692693	/// Transfer RFT token pieces from one account to another.694	///695	/// If the sender is no longer owns any pieces after the `transfer` than she stops being an owner of the token.696	///697	/// - `from`: Owner of token pieces to transfer.698	/// - `to`: Recepient of transfered token pieces.699	/// - `amount`: Amount of token pieces to transfer.700	/// - `token`: Token whos pieces should be transfered701	/// - `collection`: Collection that contains the token702	pub fn transfer(703		collection: &RefungibleHandle<T>,704		from: &T::CrossAccountId,705		to: &T::CrossAccountId,706		token: TokenId,707		amount: u128,708		nesting_budget: &dyn Budget,709	) -> DispatchResult {710		ensure!(711			collection.limits.transfers_enabled(),712			<CommonError<T>>::TransferNotAllowed713		);714715		if collection.permissions.access() == AccessMode::AllowList {716			collection.check_allowlist(from)?;717			collection.check_allowlist(to)?;718		}719		<PalletCommon<T>>::ensure_correct_receiver(to)?;720721		let initial_balance_from = <Balance<T>>::get((collection.id, token, from));722723		if initial_balance_from == 0 {724			return Err(<CommonError<T>>::TokenValueTooLow.into());725		}726727		let updated_balance_from = initial_balance_from728			.checked_sub(amount)729			.ok_or(<CommonError<T>>::TokenValueTooLow)?;730		let mut create_target = false;731		let from_to_differ = from != to;732		let updated_balance_to = if from != to && amount != 0 {733			let old_balance = <Balance<T>>::get((collection.id, token, to));734			if old_balance == 0 {735				create_target = true;736			}737			Some(738				old_balance739					.checked_add(amount)740					.ok_or(ArithmeticError::Overflow)?,741			)742		} else {743			None744		};745746		let account_balance_from = if updated_balance_from == 0 {747			Some(748				<AccountBalance<T>>::get((collection.id, from))749					.checked_sub(1)750					// Should not occur751					.ok_or(ArithmeticError::Underflow)?,752			)753		} else {754			None755		};756		// Account data is created in token, AccountBalance should be increased757		// But only if from != to as we shouldn't check overflow in this case758		let account_balance_to = if create_target && from_to_differ {759			let account_balance_to = <AccountBalance<T>>::get((collection.id, to))760				.checked_add(1)761				.ok_or(ArithmeticError::Overflow)?;762			ensure!(763				account_balance_to < collection.limits.account_token_ownership_limit(),764				<CommonError<T>>::AccountTokenLimitExceeded,765			);766767			Some(account_balance_to)768		} else {769			None770		};771772		// =========773774		if let Some(updated_balance_to) = updated_balance_to {775			// from != to && amount != 0776777			<PalletStructure<T>>::nest_if_sent_to_token(778				from.clone(),779				to,780				collection.id,781				token,782				nesting_budget,783			)?;784785			if updated_balance_from == 0 {786				<Balance<T>>::remove((collection.id, token, from));787				<PalletStructure<T>>::unnest_if_nested(from, collection.id, token);788			} else {789				<Balance<T>>::insert((collection.id, token, from), updated_balance_from);790			}791			<Balance<T>>::insert((collection.id, token, to), updated_balance_to);792			if let Some(account_balance_from) = account_balance_from {793				<AccountBalance<T>>::insert((collection.id, from), account_balance_from);794				<Owned<T>>::remove((collection.id, from, token));795			}796			if let Some(account_balance_to) = account_balance_to {797				<AccountBalance<T>>::insert((collection.id, to), account_balance_to);798				<Owned<T>>::insert((collection.id, to, token), true);799			}800		}801802		<PalletEvm<T>>::deposit_log(803			ERC20Events::Transfer {804				from: *from.as_eth(),805				to: *to.as_eth(),806				value: amount.into(),807			}808			.to_log(T::EvmTokenAddressMapping::token_to_address(809				collection.id,810				token,811			)),812		);813814		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(815			collection.id,816			token,817			from.clone(),818			to.clone(),819			amount,820		));821822		let total_supply = <TotalSupply<T>>::get((collection.id, token));823824		if amount == total_supply {825			// if token was fully owned by `from` and will be fully owned by `to` after transfer826			<PalletEvm<T>>::deposit_log(827				ERC721Events::Transfer {828					from: *from.as_eth(),829					to: *to.as_eth(),830					token_id: token.into(),831				}832				.to_log(collection_id_to_address(collection.id)),833			);834		} else if let Some(updated_balance_to) = updated_balance_to {835			// if `from` not equals `to`. This condition is needed to avoid sending event836			// when `from` fully owns token and sends part of token pieces to itself.837			if initial_balance_from == total_supply {838				// if token was fully owned by `from` and will be only partially owned by `to`839				// and `from` after transfer840				<PalletEvm<T>>::deposit_log(841					ERC721Events::Transfer {842						from: *from.as_eth(),843						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,844						token_id: token.into(),845					}846					.to_log(collection_id_to_address(collection.id)),847				);848			} else if updated_balance_to == total_supply {849				// if token was partially owned by `from` and will be fully owned by `to` after transfer850				<PalletEvm<T>>::deposit_log(851					ERC721Events::Transfer {852						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,853						to: *to.as_eth(),854						token_id: token.into(),855					}856					.to_log(collection_id_to_address(collection.id)),857				);858			}859		}860861		Ok(())862	}863864	/// Batched operation to create multiple RFT tokens.865	///866	/// Same as `create_item` but creates multiple tokens.867	///868	/// - `data`: Same as 'data` in `create_item` but contains data for multiple tokens.869	pub fn create_multiple_items(870		collection: &RefungibleHandle<T>,871		sender: &T::CrossAccountId,872		data: Vec<CreateItemData<T>>,873		nesting_budget: &dyn Budget,874	) -> DispatchResult {875		if !collection.is_owner_or_admin(sender) {876			ensure!(877				collection.permissions.mint_mode(),878				<CommonError<T>>::PublicMintingNotAllowed879			);880			collection.check_allowlist(sender)?;881882			for item in data.iter() {883				for user in item.users.keys() {884					collection.check_allowlist(user)?;885				}886			}887		}888889		for item in data.iter() {890			for (owner, _) in item.users.iter() {891				<PalletCommon<T>>::ensure_correct_receiver(owner)?;892			}893		}894895		// Total pieces per tokens896		let totals = data897			.iter()898			.map(|data| {899				Ok(data900					.users901					.iter()902					.map(|u| u.1)903					.try_fold(0u128, |acc, v| acc.checked_add(*v))904					.ok_or(ArithmeticError::Overflow)?)905			})906			.collect::<Result<Vec<_>, DispatchError>>()?;907		for total in &totals {908			ensure!(909				*total <= MAX_REFUNGIBLE_PIECES,910				<Error<T>>::WrongRefungiblePieces911			);912		}913914		let first_token_id = <TokensMinted<T>>::get(collection.id);915		let tokens_minted = first_token_id916			.checked_add(data.len() as u32)917			.ok_or(ArithmeticError::Overflow)?;918		ensure!(919			tokens_minted < collection.limits.token_limit(),920			<CommonError<T>>::CollectionTokenLimitExceeded921		);922923		let mut balances = BTreeMap::new();924		for data in &data {925			for owner in data.users.keys() {926				let balance = balances927					.entry(owner)928					.or_insert_with(|| <AccountBalance<T>>::get((collection.id, owner)));929				*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;930931				ensure!(932					*balance <= collection.limits.account_token_ownership_limit(),933					<CommonError<T>>::AccountTokenLimitExceeded,934				);935			}936		}937938		for (i, token) in data.iter().enumerate() {939			let token_id = TokenId(first_token_id + i as u32 + 1);940			for (to, _) in token.users.iter() {941				<PalletStructure<T>>::check_nesting(942					sender.clone(),943					to,944					collection.id,945					token_id,946					nesting_budget,947				)?;948			}949		}950951		// =========952953		with_transaction(|| {954			for (i, data) in data.iter().enumerate() {955				let token_id = first_token_id + i as u32 + 1;956				<TotalSupply<T>>::insert((collection.id, token_id), totals[i]);957958				for (user, amount) in data.users.iter() {959					if *amount == 0 {960						continue;961					}962					<Balance<T>>::insert((collection.id, token_id, &user), amount);963					<Owned<T>>::insert((collection.id, &user, TokenId(token_id)), true);964					<PalletStructure<T>>::nest_if_sent_to_token_unchecked(965						user,966						collection.id,967						TokenId(token_id),968					);969				}970971				if let Err(e) = Self::set_token_properties(972					collection,973					sender,974					TokenId(token_id),975					data.properties.clone().into_iter(),976					true,977					nesting_budget,978				) {979					return TransactionOutcome::Rollback(Err(e));980				}981			}982			TransactionOutcome::Commit(Ok(()))983		})?;984985		<TokensMinted<T>>::insert(collection.id, tokens_minted);986987		for (account, balance) in balances {988			<AccountBalance<T>>::insert((collection.id, account), balance);989		}990991		for (i, token) in data.into_iter().enumerate() {992			let token_id = first_token_id + i as u32 + 1;993994			let receivers = token995				.users996				.into_iter()997				.filter(|(_, amount)| *amount > 0)998				.collect::<Vec<_>>();9991000			if let [(user, _)] = receivers.as_slice() {1001				// if there is exactly one receiver1002				<PalletEvm<T>>::deposit_log(1003					ERC721Events::Transfer {1004						from: H160::default(),1005						to: *user.as_eth(),1006						token_id: token_id.into(),1007					}1008					.to_log(collection_id_to_address(collection.id)),1009				);1010			} else if let [_, ..] = receivers.as_slice() {1011				// if there is more than one receiver1012				<PalletEvm<T>>::deposit_log(1013					ERC721Events::Transfer {1014						from: H160::default(),1015						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,1016						token_id: token_id.into(),1017					}1018					.to_log(collection_id_to_address(collection.id)),1019				);1020			}10211022			for (user, amount) in receivers.into_iter() {1023				<PalletEvm<T>>::deposit_log(1024					ERC20Events::Transfer {1025						from: H160::default(),1026						to: *user.as_eth(),1027						value: amount.into(),1028					}1029					.to_log(T::EvmTokenAddressMapping::token_to_address(1030						collection.id,1031						TokenId(token_id),1032					)),1033				);1034				<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1035					collection.id,1036					TokenId(token_id),1037					user,1038					amount,1039				));1040			}1041		}1042		Ok(())1043	}10441045	pub fn set_allowance_unchecked(1046		collection: &RefungibleHandle<T>,1047		sender: &T::CrossAccountId,1048		spender: &T::CrossAccountId,1049		token: TokenId,1050		amount: u128,1051	) {1052		if amount == 0 {1053			<Allowance<T>>::remove((collection.id, token, sender, spender));1054		} else {1055			<Allowance<T>>::insert((collection.id, token, sender, spender), amount);1056		}10571058		<PalletEvm<T>>::deposit_log(1059			ERC20Events::Approval {1060				owner: *sender.as_eth(),1061				spender: *spender.as_eth(),1062				value: amount.into(),1063			}1064			.to_log(T::EvmTokenAddressMapping::token_to_address(1065				collection.id,1066				token,1067			)),1068		);1069		<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1070			collection.id,1071			token,1072			sender.clone(),1073			spender.clone(),1074			amount,1075		))1076	}10771078	/// Set allowance for the spender to `transfer` or `burn` sender's token pieces.1079	///1080	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1081	pub fn set_allowance(1082		collection: &RefungibleHandle<T>,1083		sender: &T::CrossAccountId,1084		spender: &T::CrossAccountId,1085		token: TokenId,1086		amount: u128,1087	) -> DispatchResult {1088		if collection.permissions.access() == AccessMode::AllowList {1089			collection.check_allowlist(sender)?;1090			collection.check_allowlist(spender)?;1091		}10921093		<PalletCommon<T>>::ensure_correct_receiver(spender)?;10941095		if <Balance<T>>::get((collection.id, token, sender)) < amount {1096			ensure!(1097				collection.ignores_owned_amount(sender) && Self::token_exists(collection, token),1098				<CommonError<T>>::CantApproveMoreThanOwned1099			);1100		}11011102		// =========11031104		Self::set_allowance_unchecked(collection, sender, spender, token, amount);1105		Ok(())1106	}11071108	/// Set allowance to spend from sender's eth mirror1109	///1110	/// - `from`: Address of sender's eth mirror.1111	/// - `to`: Adress of spender.1112	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1113	pub fn set_allowance_from(1114		collection: &RefungibleHandle<T>,1115		sender: &T::CrossAccountId,1116		from: &T::CrossAccountId,1117		to: &T::CrossAccountId,1118		token_id: TokenId,1119		amount: u128,1120	) -> DispatchResult {1121		if collection.permissions.access() == AccessMode::AllowList {1122			collection.check_allowlist(sender)?;1123			collection.check_allowlist(from)?;1124			collection.check_allowlist(to)?;1125		}11261127		<PalletCommon<T>>::ensure_correct_receiver(to)?;11281129		ensure!(1130			sender.conv_eq(from),1131			<CommonError<T>>::AddressIsNotEthMirror1132		);11331134		if <Balance<T>>::get((collection.id, token_id, from)) < amount {1135			ensure!(1136				collection.limits.owner_can_transfer()1137					&& (collection.is_owner_or_admin(sender) || collection.is_owner_or_admin(from))1138					&& Self::token_exists(collection, token_id),1139				<CommonError<T>>::CantApproveMoreThanOwned1140			);1141		}11421143		// =========11441145		Self::set_allowance_unchecked(collection, from, to, token_id, amount);1146		Ok(())1147	}11481149	/// Returns allowance, which should be set after transaction1150	fn check_allowed(1151		collection: &RefungibleHandle<T>,1152		spender: &T::CrossAccountId,1153		from: &T::CrossAccountId,1154		token: TokenId,1155		amount: u128,1156		nesting_budget: &dyn Budget,1157	) -> Result<Option<u128>, DispatchError> {1158		if spender.conv_eq(from) {1159			return Ok(None);1160		}1161		if collection.permissions.access() == AccessMode::AllowList {1162			// `from`, `to` checked in [`transfer`]1163			collection.check_allowlist(spender)?;1164		}1165		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1166			// TODO: should collection owner be allowed to perform this transfer?1167			ensure!(1168				<PalletStructure<T>>::check_indirectly_owned(1169					spender.clone(),1170					source.0,1171					source.1,1172					None,1173					nesting_budget1174				)?,1175				<CommonError<T>>::ApprovedValueTooLow,1176			);1177			return Ok(None);1178		}1179		let allowance =1180			<Allowance<T>>::get((collection.id, token, from, &spender)).checked_sub(amount);11811182		// Allowance (if any) would be reduced if spender is also wallet operator1183		if <CollectionAllowance<T>>::get((collection.id, from, spender)) {1184			return Ok(allowance);1185		}11861187		if allowance.is_none() {1188			ensure!(1189				collection.ignores_allowance(spender),1190				<CommonError<T>>::ApprovedValueTooLow1191			);1192		}1193		Ok(allowance)1194	}11951196	/// Transfer RFT token pieces from one account to another.1197	///1198	/// Same as the [`transfer`] but spender doesn't needs to be an owner of the token pieces.1199	/// The owner should set allowance for the spender to transfer pieces.1200	///1201	/// [`transfer`]: struct.Pallet.html#method.transfer1202	pub fn transfer_from(1203		collection: &RefungibleHandle<T>,1204		spender: &T::CrossAccountId,1205		from: &T::CrossAccountId,1206		to: &T::CrossAccountId,1207		token: TokenId,1208		amount: u128,1209		nesting_budget: &dyn Budget,1210	) -> DispatchResult {1211		let allowance =1212			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;12131214		// =========12151216		Self::transfer(collection, from, to, token, amount, nesting_budget)?;1217		if let Some(allowance) = allowance {1218			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1219		}1220		Ok(())1221	}12221223	/// Burn RFT token pieces from the account.1224	///1225	/// Same as the [`burn`] but spender doesn't need to be an owner of the token pieces. The owner should1226	/// set allowance for the spender to burn pieces1227	///1228	/// [`burn`]: struct.Pallet.html#method.burn1229	pub fn burn_from(1230		collection: &RefungibleHandle<T>,1231		spender: &T::CrossAccountId,1232		from: &T::CrossAccountId,1233		token: TokenId,1234		amount: u128,1235		nesting_budget: &dyn Budget,1236	) -> DispatchResult {1237		let allowance =1238			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;12391240		// =========12411242		Self::burn(collection, from, token, amount)?;1243		if let Some(allowance) = allowance {1244			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1245		}1246		Ok(())1247	}12481249	/// Create RFT token.1250	///1251	/// The sender should be the owner/admin of the collection or collection should be configured1252	/// to allow public minting.1253	///1254	/// - `data`: Contains list of users who will become the owners of the token pieces and amount1255	///   of token pieces they will receive.1256	pub fn create_item(1257		collection: &RefungibleHandle<T>,1258		sender: &T::CrossAccountId,1259		data: CreateItemData<T>,1260		nesting_budget: &dyn Budget,1261	) -> DispatchResult {1262		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1263	}12641265	/// Repartition RFT token.1266	///1267	/// `repartition` will set token balance of the sender and total amount of token pieces.1268	/// Sender should own all of the token pieces. `repartition' could be done even if some1269	/// token pieces were burned before.1270	///1271	/// - `amount`: Total amount of token pieces that the token will have after `repartition`.1272	pub fn repartition(1273		collection: &RefungibleHandle<T>,1274		owner: &T::CrossAccountId,1275		token: TokenId,1276		amount: u128,1277	) -> DispatchResult {1278		ensure!(1279			amount <= MAX_REFUNGIBLE_PIECES,1280			<Error<T>>::WrongRefungiblePieces1281		);1282		ensure!(amount > 0, <CommonError<T>>::TokenValueTooLow);1283		// Ensure user owns all pieces1284		let total_pieces = Self::total_pieces(collection.id, token).unwrap_or(u128::MAX);1285		let balance = <Balance<T>>::get((collection.id, token, owner));1286		ensure!(1287			total_pieces == balance,1288			<Error<T>>::RepartitionWhileNotOwningAllPieces1289		);12901291		<Balance<T>>::insert((collection.id, token, owner), amount);1292		<TotalSupply<T>>::insert((collection.id, token), amount);12931294		if amount > total_pieces {1295			let mint_amount = amount - total_pieces;1296			<PalletEvm<T>>::deposit_log(1297				ERC20Events::Transfer {1298					from: H160::default(),1299					to: *owner.as_eth(),1300					value: mint_amount.into(),1301				}1302				.to_log(T::EvmTokenAddressMapping::token_to_address(1303					collection.id,1304					token,1305				)),1306			);1307			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1308				collection.id,1309				token,1310				owner.clone(),1311				mint_amount,1312			));1313		} else if total_pieces > amount {1314			let burn_amount = total_pieces - amount;1315			<PalletEvm<T>>::deposit_log(1316				ERC20Events::Transfer {1317					from: *owner.as_eth(),1318					to: H160::default(),1319					value: burn_amount.into(),1320				}1321				.to_log(T::EvmTokenAddressMapping::token_to_address(1322					collection.id,1323					token,1324				)),1325			);1326			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(1327				collection.id,1328				token,1329				owner.clone(),1330				burn_amount,1331			));1332		}13331334		Ok(())1335	}13361337	fn token_owner(collection_id: CollectionId, token_id: TokenId) -> Option<T::CrossAccountId> {1338		let mut owner = None;1339		let mut count = 0;1340		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {1341			count += 1;1342			if count > 1 {1343				return None;1344			}1345			owner = Some(key);1346		}1347		owner1348	}13491350	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {1351		<TotalSupply<T>>::try_get((collection_id, token_id)).ok()1352	}13531354	pub fn set_collection_properties(1355		collection: &RefungibleHandle<T>,1356		sender: &T::CrossAccountId,1357		properties: Vec<Property>,1358	) -> DispatchResult {1359		<PalletCommon<T>>::set_collection_properties(collection, sender, properties.into_iter())1360	}13611362	pub fn delete_collection_properties(1363		collection: &RefungibleHandle<T>,1364		sender: &T::CrossAccountId,1365		property_keys: Vec<PropertyKey>,1366	) -> DispatchResult {1367		<PalletCommon<T>>::delete_collection_properties(1368			collection,1369			sender,1370			property_keys.into_iter(),1371		)1372	}13731374	pub fn set_token_property_permissions(1375		collection: &RefungibleHandle<T>,1376		sender: &T::CrossAccountId,1377		property_permissions: Vec<PropertyKeyPermission>,1378	) -> DispatchResult {1379		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)1380	}13811382	pub fn token_property_permission(collection_id: CollectionId) -> PropertiesPermissionMap {1383		<PalletCommon<T>>::property_permissions(collection_id)1384	}13851386	pub fn set_scoped_token_property_permissions(1387		collection: &RefungibleHandle<T>,1388		sender: &T::CrossAccountId,1389		scope: PropertyScope,1390		property_permissions: Vec<PropertyKeyPermission>,1391	) -> DispatchResult {1392		<PalletCommon<T>>::set_scoped_token_property_permissions(1393			collection,1394			sender,1395			scope,1396			property_permissions,1397		)1398	}13991400	/// Returns 10 token in no particular order.1401	///1402	/// There is no direct way to get token holders in ascending order,1403	/// since `iter_prefix` returns values in no particular order.1404	/// Therefore, getting the 10 largest holders with a large value of holders1405	/// can lead to impact memory allocation + sorting with  `n * log (n)`.1406	pub fn token_owners(1407		collection_id: CollectionId,1408		token: TokenId,1409	) -> Option<Vec<T::CrossAccountId>> {1410		let res: Vec<T::CrossAccountId> = <Balance<T>>::iter_prefix((collection_id, token))1411			.map(|(owner, _amount)| owner)1412			.take(10)1413			.collect();14141415		if res.is_empty() {1416			None1417		} else {1418			Some(res)1419		}1420	}14211422	/// Sets or unsets the approval of a given operator.1423	///1424	/// The `operator` is allowed to transfer all token pieces of the `owner` on their behalf.1425	/// - `owner`: Token owner1426	/// - `operator`: Operator1427	/// - `approve`: Should operator status be granted or revoked?1428	pub fn set_allowance_for_all(1429		collection: &RefungibleHandle<T>,1430		owner: &T::CrossAccountId,1431		operator: &T::CrossAccountId,1432		approve: bool,1433	) -> DispatchResult {1434		if collection.permissions.access() == AccessMode::AllowList {1435			collection.check_allowlist(owner)?;1436			collection.check_allowlist(operator)?;1437		}14381439		<PalletCommon<T>>::ensure_correct_receiver(operator)?;14401441		// =========14421443		<CollectionAllowance<T>>::insert((collection.id, owner, operator), approve);1444		<PalletEvm<T>>::deposit_log(1445			ERC721Events::ApprovalForAll {1446				owner: *owner.as_eth(),1447				operator: *operator.as_eth(),1448				approved: approve,1449			}1450			.to_log(collection_id_to_address(collection.id)),1451		);1452		<PalletCommon<T>>::deposit_event(CommonEvent::ApprovedForAll(1453			collection.id,1454			owner.clone(),1455			operator.clone(),1456			approve,1457		));1458		Ok(())1459	}14601461	/// Tells whether the given `owner` approves the `operator`.1462	pub fn allowance_for_all(1463		collection: &RefungibleHandle<T>,1464		owner: &T::CrossAccountId,1465		operator: &T::CrossAccountId,1466	) -> bool {1467		<CollectionAllowance<T>>::get((collection.id, owner, operator))1468	}14691470	pub fn repair_item(collection: &RefungibleHandle<T>, token: TokenId) -> DispatchResult {1471		<TokenProperties<T>>::mutate((collection.id, token), |properties| {1472			properties.recompute_consumed_space();1473		});14741475		Ok(())1476	}1477}