git.delta.rocks / unique-network / refs/commits / 23899b624a22

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, cmp::Ordering};94use evm_coder::ToLog;95use frame_support::{ensure, 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,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, PropertyScope, PropertyValue, TokenId, TrySetProperty,110	PropertiesPermissionMap, CreateRefungibleExMultipleOwners, TokenOwnerError,111	TokenProperties as TokenPropertiesT,112};113114pub use pallet::*;115#[cfg(feature = "runtime-benchmarks")]116pub mod benchmarking;117pub mod common;118pub mod erc;119pub mod erc_token;120pub mod weights;121122pub type CreateItemData<T> =123	CreateRefungibleExMultipleOwners<<T as pallet_evm::Config>::CrossAccountId>;124pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;125126#[frame_support::pallet]127pub mod pallet {128	use super::*;129	use frame_support::{130		Blake2_128, Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key,131		traits::StorageVersion,132	};133	use up_data_structs::{CollectionId, TokenId};134	use super::weights::WeightInfo;135136	#[pallet::error]137	pub enum Error<T> {138		/// Not Refungible item data used to mint in Refungible collection.139		NotRefungibleDataUsedToMintFungibleCollectionToken,140		/// Maximum refungibility exceeded.141		WrongRefungiblePieces,142		/// Refungible token can't be repartitioned by user who isn't owns all pieces.143		RepartitionWhileNotOwningAllPieces,144		/// Refungible token can't nest other tokens.145		RefungibleDisallowsNesting,146		/// Setting item properties is not allowed.147		SettingPropertiesNotAllowed,148	}149150	#[pallet::config]151	pub trait Config:152		frame_system::Config + pallet_common::Config + pallet_structure::Config153	{154		type WeightInfo: WeightInfo;155	}156157	const STORAGE_VERSION: StorageVersion = StorageVersion::new(2);158159	#[pallet::pallet]160	#[pallet::storage_version(STORAGE_VERSION)]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 = TokenPropertiesT,179		QueryKind = ValueQuery,180	>;181182	/// Total amount of pieces for token183	#[pallet::storage]184	pub type TotalSupply<T: Config> = StorageNMap<185		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),186		Value = u128,187		QueryKind = ValueQuery,188	>;189190	/// Used to enumerate tokens owned by account.191	#[pallet::storage]192	pub type Owned<T: Config> = StorageNMap<193		Key = (194			Key<Twox64Concat, CollectionId>,195			Key<Blake2_128Concat, T::CrossAccountId>,196			Key<Twox64Concat, TokenId>,197		),198		Value = bool,199		QueryKind = ValueQuery,200	>;201202	/// Amount of tokens (not pieces) partially owned by an account within a collection.203	#[pallet::storage]204	pub type AccountBalance<T: Config> = StorageNMap<205		Key = (206			Key<Twox64Concat, CollectionId>,207			// Owner208			Key<Blake2_128Concat, T::CrossAccountId>,209		),210		Value = u32,211		QueryKind = ValueQuery,212	>;213214	/// Amount of token pieces owned by account.215	#[pallet::storage]216	pub type Balance<T: Config> = StorageNMap<217		Key = (218			Key<Twox64Concat, CollectionId>,219			Key<Twox64Concat, TokenId>,220			// Owner221			Key<Blake2_128Concat, T::CrossAccountId>,222		),223		Value = u128,224		QueryKind = ValueQuery,225	>;226227	/// Allowance set by a token owner for another user to perform one of certain transactions on a number of pieces of a token.228	#[pallet::storage]229	pub type Allowance<T: Config> = StorageNMap<230		Key = (231			Key<Twox64Concat, CollectionId>,232			Key<Twox64Concat, TokenId>,233			// Owner234			Key<Blake2_128, T::CrossAccountId>,235			// Spender236			Key<Blake2_128Concat, T::CrossAccountId>,237		),238		Value = u128,239		QueryKind = ValueQuery,240	>;241242	/// Spender set by a wallet owner that could perform certain transactions on all tokens in the wallet.243	#[pallet::storage]244	pub type CollectionAllowance<T: Config> = StorageNMap<245		Key = (246			Key<Twox64Concat, CollectionId>,247			Key<Blake2_128Concat, T::CrossAccountId>, // Owner248			Key<Blake2_128Concat, T::CrossAccountId>, // Spender249		),250		Value = bool,251		QueryKind = ValueQuery,252	>;253}254255pub struct RefungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);256impl<T: Config> RefungibleHandle<T> {257	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {258		Self(inner)259	}260	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {261		self.0262	}263	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {264		&mut self.0265	}266}267268impl<T: Config> Deref for RefungibleHandle<T> {269	type Target = pallet_common::CollectionHandle<T>;270271	fn deref(&self) -> &Self::Target {272		&self.0273	}274}275276impl<T: Config> WithRecorder<T> for RefungibleHandle<T> {277	fn recorder(&self) -> &pallet_evm_coder_substrate::SubstrateRecorder<T> {278		self.0.recorder()279	}280	fn into_recorder(self) -> pallet_evm_coder_substrate::SubstrateRecorder<T> {281		self.0.into_recorder()282	}283}284285impl<T: Config> Pallet<T> {286	/// Get number of RFT tokens in collection287	pub fn total_supply(collection: &RefungibleHandle<T>) -> u32 {288		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)289	}290291	/// Check that RFT token exists292	///293	/// - `token`: Token ID.294	pub fn token_exists(collection: &RefungibleHandle<T>, token: TokenId) -> bool {295		<TotalSupply<T>>::contains_key((collection.id, token))296	}297298	pub fn set_scoped_token_property(299		collection_id: CollectionId,300		token_id: TokenId,301		scope: PropertyScope,302		property: Property,303	) -> DispatchResult {304		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {305			properties.try_scoped_set(scope, property.key, property.value)306		})307		.map_err(<CommonError<T>>::from)?;308309		Ok(())310	}311312	pub fn set_scoped_token_properties(313		collection_id: CollectionId,314		token_id: TokenId,315		scope: PropertyScope,316		properties: impl Iterator<Item = Property>,317	) -> DispatchResult {318		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {319			stored_properties.try_scoped_set_from_iter(scope, properties)320		})321		.map_err(<CommonError<T>>::from)?;322323		Ok(())324	}325}326327// unchecked calls skips any permission checks328impl<T: Config> Pallet<T> {329	/// Create RFT collection330	///331	/// `init_collection` will take non-refundable deposit for collection creation.332	///333	/// - `data`: Contains settings for collection limits and permissions.334	pub fn init_collection(335		owner: T::CrossAccountId,336		payer: T::CrossAccountId,337		data: CreateCollectionData<T::AccountId>,338		flags: CollectionFlags,339	) -> Result<CollectionId, DispatchError> {340		<PalletCommon<T>>::init_collection(owner, payer, data, flags)341	}342343	/// Destroy RFT collection344	///345	/// `destroy_collection` will throw error if collection contains any tokens.346	/// Only owner can destroy collection.347	pub fn destroy_collection(348		collection: RefungibleHandle<T>,349		sender: &T::CrossAccountId,350	) -> DispatchResult {351		let id = collection.id;352353		if Self::collection_has_tokens(id) {354			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());355		}356357		// =========358359		PalletCommon::destroy_collection(collection.0, sender)?;360361		<TokensMinted<T>>::remove(id);362		<TokensBurnt<T>>::remove(id);363		let _ = <TotalSupply<T>>::clear_prefix((id,), u32::MAX, None);364		let _ = <Balance<T>>::clear_prefix((id,), u32::MAX, None);365		let _ = <Allowance<T>>::clear_prefix((id,), u32::MAX, None);366		let _ = <Owned<T>>::clear_prefix((id,), u32::MAX, None);367		let _ = <AccountBalance<T>>::clear_prefix((id,), u32::MAX, None);368		Ok(())369	}370371	fn collection_has_tokens(collection_id: CollectionId) -> bool {372		<TotalSupply<T>>::iter_prefix((collection_id,))373			.next()374			.is_some()375	}376377	pub fn burn_token_unchecked(378		collection: &RefungibleHandle<T>,379		owner: &T::CrossAccountId,380		token_id: TokenId,381	) -> DispatchResult {382		let burnt = <TokensBurnt<T>>::get(collection.id)383			.checked_add(1)384			.ok_or(ArithmeticError::Overflow)?;385386		<TokensBurnt<T>>::insert(collection.id, burnt);387		<TokenProperties<T>>::remove((collection.id, token_id));388		<TotalSupply<T>>::remove((collection.id, token_id));389		let _ = <Balance<T>>::clear_prefix((collection.id, token_id), u32::MAX, None);390		let _ = <Allowance<T>>::clear_prefix((collection.id, token_id), u32::MAX, None);391		<PalletEvm<T>>::deposit_log(392			ERC721Events::Transfer {393				from: *owner.as_eth(),394				to: H160::default(),395				token_id: token_id.into(),396			}397			.to_log(collection_id_to_address(collection.id)),398		);399		Ok(())400	}401402	/// Burn RFT token pieces403	///404	/// `burn` will decrease total amount of token pieces and amount owned by sender.405	/// `burn` can be called even if there are multiple owners of the RFT token.406	/// If sender wouldn't have any pieces left after `burn` than she will stop being407	/// one of the owners of the token. If there is no account that owns any pieces of408	/// the token than token will be burned too.409	///410	/// - `amount`: Amount of token pieces to burn.411	/// - `token`: Token who's pieces should be burned412	/// - `collection`: Collection that contains the token413	pub fn burn(414		collection: &RefungibleHandle<T>,415		owner: &T::CrossAccountId,416		token: TokenId,417		amount: u128,418	) -> DispatchResult {419		if <Balance<T>>::get((collection.id, token, owner)) == 0 {420			return Err(<CommonError<T>>::TokenValueTooLow.into());421		}422423		let total_supply = <TotalSupply<T>>::get((collection.id, token))424			.checked_sub(amount)425			.ok_or(<CommonError<T>>::TokenValueTooLow)?;426427		// This was probally last owner of this token?428		if total_supply == 0 {429			// Ensure user actually owns this amount430			ensure!(431				<Balance<T>>::get((collection.id, token, owner)) == amount,432				<CommonError<T>>::TokenValueTooLow433			);434			let account_balance = <AccountBalance<T>>::get((collection.id, owner))435				.checked_sub(1)436				// Should not occur437				.ok_or(ArithmeticError::Underflow)?;438439			// =========440441			<Owned<T>>::remove((collection.id, owner, token));442			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);443			<AccountBalance<T>>::insert((collection.id, owner), account_balance);444			Self::burn_token_unchecked(collection, owner, token)?;445			<PalletEvm<T>>::deposit_log(446				ERC20Events::Transfer {447					from: *owner.as_eth(),448					to: H160::default(),449					value: amount.into(),450				}451				.to_log(collection_id_to_address(collection.id)),452			);453			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(454				collection.id,455				token,456				owner.clone(),457				amount,458			));459			return Ok(());460		}461462		let balance = <Balance<T>>::get((collection.id, token, owner))463			.checked_sub(amount)464			.ok_or(<CommonError<T>>::TokenValueTooLow)?;465		let account_balance = if balance == 0 {466			<AccountBalance<T>>::get((collection.id, owner))467				.checked_sub(1)468				// Should not occur469				.ok_or(ArithmeticError::Underflow)?470		} else {471			0472		};473474		// =========475476		if balance == 0 {477			<Owned<T>>::remove((collection.id, owner, token));478			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);479			<Balance<T>>::remove((collection.id, token, owner));480			<AccountBalance<T>>::insert((collection.id, owner), account_balance);481482			if let Ok(user) = Self::token_owner(collection.id, token) {483				<PalletEvm<T>>::deposit_log(484					ERC721Events::Transfer {485						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,486						to: *user.as_eth(),487						token_id: token.into(),488					}489					.to_log(collection_id_to_address(collection.id)),490				);491			}492		} else {493			<Balance<T>>::insert((collection.id, token, owner), balance);494		}495		<TotalSupply<T>>::insert((collection.id, token), total_supply);496497		<PalletEvm<T>>::deposit_log(498			ERC20Events::Transfer {499				from: *owner.as_eth(),500				to: H160::default(),501				value: amount.into(),502			}503			.to_log(T::EvmTokenAddressMapping::token_to_address(504				collection.id,505				token,506			)),507		);508		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(509			collection.id,510			token,511			owner.clone(),512			amount,513		));514		Ok(())515	}516517	/// A batch operation to add, edit or remove properties for a token.518	/// It sets or removes a token's properties according to519	/// `properties_updates` contents:520	/// * sets a property under the <key> with the value provided `(<key>, Some(<value>))`521	/// * removes a property under the <key> if the value is `None` `(<key>, None)`.522	///523	/// - `nesting_budget`: Limit for searching parents in-depth to check ownership.524	/// - `is_token_create`: Indicates that method is called during token initialization.525	///   Allows to bypass ownership check.526	///527	/// All affected properties should have `mutable` permission528	/// to be **deleted** or to be **set more than once**,529	/// and the sender should have permission to edit those properties.530	///531	/// This function fires an event for each property change.532	/// In case of an error, all the changes (including the events) will be reverted533	/// since the function is transactional.534	#[transactional]535	fn modify_token_properties(536		collection: &RefungibleHandle<T>,537		sender: &T::CrossAccountId,538		token_id: TokenId,539		properties_updates: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,540		is_token_create: bool,541		nesting_budget: &dyn Budget,542	) -> DispatchResult {543		let is_token_owner = || -> Result<bool, DispatchError> {544			let balance = collection.balance(sender.clone(), token_id);545			let total_pieces: u128 =546				Self::total_pieces(collection.id, token_id).unwrap_or(u128::MAX);547			if balance != total_pieces {548				return Ok(false);549			}550551			let is_bundle_owner = <PalletStructure<T>>::check_indirectly_owned(552				sender.clone(),553				collection.id,554				token_id,555				None,556				nesting_budget,557			)?;558559			Ok(is_bundle_owner)560		};561562		let stored_properties = <TokenProperties<T>>::get((collection.id, token_id));563564		<PalletCommon<T>>::modify_token_properties(565			collection,566			sender,567			token_id,568			properties_updates,569			is_token_create,570			stored_properties,571			is_token_owner,572			|properties| <TokenProperties<T>>::set((collection.id, token_id), properties),573			erc::ERC721TokenEvent::TokenChanged {574				token_id: token_id.into(),575			}576			.to_log(T::ContractAddress::get()),577		)578	}579580	pub fn set_token_properties(581		collection: &RefungibleHandle<T>,582		sender: &T::CrossAccountId,583		token_id: TokenId,584		properties: impl Iterator<Item = Property>,585		is_token_create: bool,586		nesting_budget: &dyn Budget,587	) -> DispatchResult {588		Self::modify_token_properties(589			collection,590			sender,591			token_id,592			properties.map(|p| (p.key, Some(p.value))),593			is_token_create,594			nesting_budget,595		)596	}597598	pub fn set_token_property(599		collection: &RefungibleHandle<T>,600		sender: &T::CrossAccountId,601		token_id: TokenId,602		property: Property,603		nesting_budget: &dyn Budget,604	) -> DispatchResult {605		let is_token_create = false;606607		Self::set_token_properties(608			collection,609			sender,610			token_id,611			[property].into_iter(),612			is_token_create,613			nesting_budget,614		)615	}616617	pub fn delete_token_properties(618		collection: &RefungibleHandle<T>,619		sender: &T::CrossAccountId,620		token_id: TokenId,621		property_keys: impl Iterator<Item = PropertyKey>,622		nesting_budget: &dyn Budget,623	) -> DispatchResult {624		let is_token_create = false;625626		Self::modify_token_properties(627			collection,628			sender,629			token_id,630			property_keys.into_iter().map(|key| (key, None)),631			is_token_create,632			nesting_budget,633		)634	}635636	pub fn delete_token_property(637		collection: &RefungibleHandle<T>,638		sender: &T::CrossAccountId,639		token_id: TokenId,640		property_key: PropertyKey,641		nesting_budget: &dyn Budget,642	) -> DispatchResult {643		Self::delete_token_properties(644			collection,645			sender,646			token_id,647			[property_key].into_iter(),648			nesting_budget,649		)650	}651652	/// Transfer RFT token pieces from one account to another.653	///654	/// If the sender is no longer owns any pieces after the `transfer` than she stops being an owner of the token.655	///656	/// - `from`: Owner of token pieces to transfer.657	/// - `to`: Recepient of transfered token pieces.658	/// - `amount`: Amount of token pieces to transfer.659	/// - `token`: Token whos pieces should be transfered660	/// - `collection`: Collection that contains the token661	pub fn transfer(662		collection: &RefungibleHandle<T>,663		from: &T::CrossAccountId,664		to: &T::CrossAccountId,665		token: TokenId,666		amount: u128,667		nesting_budget: &dyn Budget,668	) -> DispatchResult {669		ensure!(670			collection.limits.transfers_enabled(),671			<CommonError<T>>::TransferNotAllowed672		);673674		if collection.permissions.access() == AccessMode::AllowList {675			collection.check_allowlist(from)?;676			collection.check_allowlist(to)?;677		}678		<PalletCommon<T>>::ensure_correct_receiver(to)?;679680		let initial_balance_from = <Balance<T>>::get((collection.id, token, from));681682		if initial_balance_from == 0 {683			return Err(<CommonError<T>>::TokenValueTooLow.into());684		}685686		let updated_balance_from = initial_balance_from687			.checked_sub(amount)688			.ok_or(<CommonError<T>>::TokenValueTooLow)?;689		let mut create_target = false;690		let from_to_differ = from != to;691		let updated_balance_to = if from != to && amount != 0 {692			let old_balance = <Balance<T>>::get((collection.id, token, to));693			if old_balance == 0 {694				create_target = true;695			}696			Some(697				old_balance698					.checked_add(amount)699					.ok_or(ArithmeticError::Overflow)?,700			)701		} else {702			None703		};704705		let account_balance_from = if updated_balance_from == 0 {706			Some(707				<AccountBalance<T>>::get((collection.id, from))708					.checked_sub(1)709					// Should not occur710					.ok_or(ArithmeticError::Underflow)?,711			)712		} else {713			None714		};715		// Account data is created in token, AccountBalance should be increased716		// But only if from != to as we shouldn't check overflow in this case717		let account_balance_to = if create_target && from_to_differ {718			let account_balance_to = <AccountBalance<T>>::get((collection.id, to))719				.checked_add(1)720				.ok_or(ArithmeticError::Overflow)?;721			ensure!(722				account_balance_to < collection.limits.account_token_ownership_limit(),723				<CommonError<T>>::AccountTokenLimitExceeded,724			);725726			Some(account_balance_to)727		} else {728			None729		};730731		// =========732733		if let Some(updated_balance_to) = updated_balance_to {734			// from != to && amount != 0735736			<PalletStructure<T>>::nest_if_sent_to_token(737				from.clone(),738				to,739				collection.id,740				token,741				nesting_budget,742			)?;743744			if updated_balance_from == 0 {745				<Balance<T>>::remove((collection.id, token, from));746				<PalletStructure<T>>::unnest_if_nested(from, collection.id, token);747			} else {748				<Balance<T>>::insert((collection.id, token, from), updated_balance_from);749			}750			<Balance<T>>::insert((collection.id, token, to), updated_balance_to);751			if let Some(account_balance_from) = account_balance_from {752				<AccountBalance<T>>::insert((collection.id, from), account_balance_from);753				<Owned<T>>::remove((collection.id, from, token));754			}755			if let Some(account_balance_to) = account_balance_to {756				<AccountBalance<T>>::insert((collection.id, to), account_balance_to);757				<Owned<T>>::insert((collection.id, to, token), true);758			}759		}760761		<PalletEvm<T>>::deposit_log(762			ERC20Events::Transfer {763				from: *from.as_eth(),764				to: *to.as_eth(),765				value: amount.into(),766			}767			.to_log(T::EvmTokenAddressMapping::token_to_address(768				collection.id,769				token,770			)),771		);772773		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(774			collection.id,775			token,776			from.clone(),777			to.clone(),778			amount,779		));780781		let total_supply = <TotalSupply<T>>::get((collection.id, token));782783		if amount == total_supply {784			// if token was fully owned by `from` and will be fully owned by `to` after transfer785			<PalletEvm<T>>::deposit_log(786				ERC721Events::Transfer {787					from: *from.as_eth(),788					to: *to.as_eth(),789					token_id: token.into(),790				}791				.to_log(collection_id_to_address(collection.id)),792			);793		} else if let Some(updated_balance_to) = updated_balance_to {794			// if `from` not equals `to`. This condition is needed to avoid sending event795			// when `from` fully owns token and sends part of token pieces to itself.796			if initial_balance_from == total_supply {797				// if token was fully owned by `from` and will be only partially owned by `to`798				// and `from` after transfer799				<PalletEvm<T>>::deposit_log(800					ERC721Events::Transfer {801						from: *from.as_eth(),802						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,803						token_id: token.into(),804					}805					.to_log(collection_id_to_address(collection.id)),806				);807			} else if updated_balance_to == total_supply {808				// if token was partially owned by `from` and will be fully owned by `to` after transfer809				<PalletEvm<T>>::deposit_log(810					ERC721Events::Transfer {811						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,812						to: *to.as_eth(),813						token_id: token.into(),814					}815					.to_log(collection_id_to_address(collection.id)),816				);817			}818		}819820		Ok(())821	}822823	/// Batched operation to create multiple RFT tokens.824	///825	/// Same as `create_item` but creates multiple tokens.826	///827	/// - `data`: Same as 'data` in `create_item` but contains data for multiple tokens.828	pub fn create_multiple_items(829		collection: &RefungibleHandle<T>,830		sender: &T::CrossAccountId,831		data: Vec<CreateItemData<T>>,832		nesting_budget: &dyn Budget,833	) -> DispatchResult {834		if !collection.is_owner_or_admin(sender) {835			ensure!(836				collection.permissions.mint_mode(),837				<CommonError<T>>::PublicMintingNotAllowed838			);839			collection.check_allowlist(sender)?;840841			for item in data.iter() {842				for user in item.users.keys() {843					collection.check_allowlist(user)?;844				}845			}846		}847848		for item in data.iter() {849			for (owner, _) in item.users.iter() {850				<PalletCommon<T>>::ensure_correct_receiver(owner)?;851			}852		}853854		// Total pieces per tokens855		let totals = data856			.iter()857			.map(|data| {858				Ok(data859					.users860					.iter()861					.map(|u| u.1)862					.try_fold(0u128, |acc, v| acc.checked_add(*v))863					.ok_or(ArithmeticError::Overflow)?)864			})865			.collect::<Result<Vec<_>, DispatchError>>()?;866		for total in &totals {867			ensure!(868				*total <= MAX_REFUNGIBLE_PIECES,869				<Error<T>>::WrongRefungiblePieces870			);871		}872873		let first_token_id = <TokensMinted<T>>::get(collection.id);874		let tokens_minted = first_token_id875			.checked_add(data.len() as u32)876			.ok_or(ArithmeticError::Overflow)?;877		ensure!(878			tokens_minted < collection.limits.token_limit(),879			<CommonError<T>>::CollectionTokenLimitExceeded880		);881882		let mut balances = BTreeMap::new();883		for data in &data {884			for owner in data.users.keys() {885				let balance = balances886					.entry(owner)887					.or_insert_with(|| <AccountBalance<T>>::get((collection.id, owner)));888				*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;889890				ensure!(891					*balance <= collection.limits.account_token_ownership_limit(),892					<CommonError<T>>::AccountTokenLimitExceeded,893				);894			}895		}896897		for (i, token) in data.iter().enumerate() {898			let token_id = TokenId(first_token_id + i as u32 + 1);899			for (to, _) in token.users.iter() {900				<PalletStructure<T>>::check_nesting(901					sender.clone(),902					to,903					collection.id,904					token_id,905					nesting_budget,906				)?;907			}908		}909910		// =========911912		with_transaction(|| {913			for (i, data) in data.iter().enumerate() {914				let token_id = first_token_id + i as u32 + 1;915				<TotalSupply<T>>::insert((collection.id, token_id), totals[i]);916917				for (user, amount) in data.users.iter() {918					if *amount == 0 {919						continue;920					}921					<Balance<T>>::insert((collection.id, token_id, &user), amount);922					<Owned<T>>::insert((collection.id, &user, TokenId(token_id)), true);923					<PalletStructure<T>>::nest_if_sent_to_token_unchecked(924						user,925						collection.id,926						TokenId(token_id),927					);928				}929930				if let Err(e) = Self::set_token_properties(931					collection,932					sender,933					TokenId(token_id),934					data.properties.clone().into_iter(),935					true,936					nesting_budget,937				) {938					return TransactionOutcome::Rollback(Err(e));939				}940			}941			TransactionOutcome::Commit(Ok(()))942		})?;943944		<TokensMinted<T>>::insert(collection.id, tokens_minted);945946		for (account, balance) in balances {947			<AccountBalance<T>>::insert((collection.id, account), balance);948		}949950		for (i, token) in data.into_iter().enumerate() {951			let token_id = first_token_id + i as u32 + 1;952953			let receivers = token954				.users955				.into_iter()956				.filter(|(_, amount)| *amount > 0)957				.collect::<Vec<_>>();958959			if let [(user, _)] = receivers.as_slice() {960				// if there is exactly one receiver961				<PalletEvm<T>>::deposit_log(962					ERC721Events::Transfer {963						from: H160::default(),964						to: *user.as_eth(),965						token_id: token_id.into(),966					}967					.to_log(collection_id_to_address(collection.id)),968				);969			} else if let [_, ..] = receivers.as_slice() {970				// if there is more than one receiver971				<PalletEvm<T>>::deposit_log(972					ERC721Events::Transfer {973						from: H160::default(),974						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,975						token_id: token_id.into(),976					}977					.to_log(collection_id_to_address(collection.id)),978				);979			}980981			for (user, amount) in receivers.into_iter() {982				<PalletEvm<T>>::deposit_log(983					ERC20Events::Transfer {984						from: H160::default(),985						to: *user.as_eth(),986						value: amount.into(),987					}988					.to_log(T::EvmTokenAddressMapping::token_to_address(989						collection.id,990						TokenId(token_id),991					)),992				);993				<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(994					collection.id,995					TokenId(token_id),996					user,997					amount,998				));999			}1000		}1001		Ok(())1002	}10031004	pub fn set_allowance_unchecked(1005		collection: &RefungibleHandle<T>,1006		sender: &T::CrossAccountId,1007		spender: &T::CrossAccountId,1008		token: TokenId,1009		amount: u128,1010	) {1011		if amount == 0 {1012			<Allowance<T>>::remove((collection.id, token, sender, spender));1013		} else {1014			<Allowance<T>>::insert((collection.id, token, sender, spender), amount);1015		}10161017		<PalletEvm<T>>::deposit_log(1018			ERC20Events::Approval {1019				owner: *sender.as_eth(),1020				spender: *spender.as_eth(),1021				value: amount.into(),1022			}1023			.to_log(T::EvmTokenAddressMapping::token_to_address(1024				collection.id,1025				token,1026			)),1027		);1028		<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1029			collection.id,1030			token,1031			sender.clone(),1032			spender.clone(),1033			amount,1034		))1035	}10361037	/// Set allowance for the spender to `transfer` or `burn` sender's token pieces.1038	///1039	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1040	pub fn set_allowance(1041		collection: &RefungibleHandle<T>,1042		sender: &T::CrossAccountId,1043		spender: &T::CrossAccountId,1044		token: TokenId,1045		amount: u128,1046	) -> DispatchResult {1047		if collection.permissions.access() == AccessMode::AllowList {1048			collection.check_allowlist(sender)?;1049			collection.check_allowlist(spender)?;1050		}10511052		<PalletCommon<T>>::ensure_correct_receiver(spender)?;10531054		if <Balance<T>>::get((collection.id, token, sender)) < amount {1055			ensure!(1056				collection.ignores_owned_amount(sender) && Self::token_exists(collection, token),1057				<CommonError<T>>::CantApproveMoreThanOwned1058			);1059		}10601061		// =========10621063		Self::set_allowance_unchecked(collection, sender, spender, token, amount);1064		Ok(())1065	}10661067	/// Set allowance to spend from sender's eth mirror1068	///1069	/// - `from`: Address of sender's eth mirror.1070	/// - `to`: Adress of spender.1071	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1072	pub fn set_allowance_from(1073		collection: &RefungibleHandle<T>,1074		sender: &T::CrossAccountId,1075		from: &T::CrossAccountId,1076		to: &T::CrossAccountId,1077		token_id: TokenId,1078		amount: u128,1079	) -> DispatchResult {1080		if collection.permissions.access() == AccessMode::AllowList {1081			collection.check_allowlist(sender)?;1082			collection.check_allowlist(from)?;1083			collection.check_allowlist(to)?;1084		}10851086		<PalletCommon<T>>::ensure_correct_receiver(to)?;10871088		ensure!(1089			sender.conv_eq(from),1090			<CommonError<T>>::AddressIsNotEthMirror1091		);10921093		if <Balance<T>>::get((collection.id, token_id, from)) < amount {1094			ensure!(1095				collection.limits.owner_can_transfer()1096					&& (collection.is_owner_or_admin(sender) || collection.is_owner_or_admin(from))1097					&& Self::token_exists(collection, token_id),1098				<CommonError<T>>::CantApproveMoreThanOwned1099			);1100		}11011102		// =========11031104		Self::set_allowance_unchecked(collection, from, to, token_id, amount);1105		Ok(())1106	}11071108	/// Returns allowance, which should be set after transaction1109	fn check_allowed(1110		collection: &RefungibleHandle<T>,1111		spender: &T::CrossAccountId,1112		from: &T::CrossAccountId,1113		token: TokenId,1114		amount: u128,1115		nesting_budget: &dyn Budget,1116	) -> Result<Option<u128>, DispatchError> {1117		if spender.conv_eq(from) {1118			return Ok(None);1119		}1120		if collection.permissions.access() == AccessMode::AllowList {1121			// `from`, `to` checked in [`transfer`]1122			collection.check_allowlist(spender)?;1123		}11241125		if collection.ignores_token_restrictions(spender) {1126			return Ok(Self::compute_allowance_decrease(1127				collection, token, from, spender, amount,1128			));1129		}11301131		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1132			// TODO: should collection owner be allowed to perform this transfer?1133			ensure!(1134				<PalletStructure<T>>::check_indirectly_owned(1135					spender.clone(),1136					source.0,1137					source.1,1138					None,1139					nesting_budget1140				)?,1141				<CommonError<T>>::ApprovedValueTooLow,1142			);1143			return Ok(None);1144		}11451146		let allowance = Self::compute_allowance_decrease(collection, token, from, spender, amount);1147		if allowance.is_some() {1148			return Ok(allowance);1149		}11501151		// Allowance (if any) would be reduced if spender is also wallet operator1152		if <CollectionAllowance<T>>::get((collection.id, from, spender)) {1153			return Ok(allowance);1154		}11551156		Err(<CommonError<T>>::ApprovedValueTooLow.into())1157	}11581159	/// Returns `Some(amount)` if the `spender` have allowance to spend this amount.1160	/// Otherwise, it returns `None`.1161	fn compute_allowance_decrease(1162		collection: &RefungibleHandle<T>,1163		token: TokenId,1164		from: &T::CrossAccountId,1165		spender: &T::CrossAccountId,1166		amount: u128,1167	) -> Option<u128> {1168		<Allowance<T>>::get((collection.id, token, from, spender)).checked_sub(amount)1169	}11701171	/// Transfer RFT token pieces from one account to another.1172	///1173	/// Same as the [`transfer`] but spender doesn't needs to be an owner of the token pieces.1174	/// The owner should set allowance for the spender to transfer pieces.1175	///1176	/// [`transfer`]: struct.Pallet.html#method.transfer1177	pub fn transfer_from(1178		collection: &RefungibleHandle<T>,1179		spender: &T::CrossAccountId,1180		from: &T::CrossAccountId,1181		to: &T::CrossAccountId,1182		token: TokenId,1183		amount: u128,1184		nesting_budget: &dyn Budget,1185	) -> DispatchResult {1186		let allowance =1187			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;11881189		// =========11901191		Self::transfer(collection, from, to, token, amount, nesting_budget)?;1192		if let Some(allowance) = allowance {1193			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1194		}1195		Ok(())1196	}11971198	/// Burn RFT token pieces from the account.1199	///1200	/// Same as the [`burn`] but spender doesn't need to be an owner of the token pieces. The owner should1201	/// set allowance for the spender to burn pieces1202	///1203	/// [`burn`]: struct.Pallet.html#method.burn1204	pub fn burn_from(1205		collection: &RefungibleHandle<T>,1206		spender: &T::CrossAccountId,1207		from: &T::CrossAccountId,1208		token: TokenId,1209		amount: u128,1210		nesting_budget: &dyn Budget,1211	) -> DispatchResult {1212		let allowance =1213			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;12141215		// =========12161217		Self::burn(collection, from, token, amount)?;1218		if let Some(allowance) = allowance {1219			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1220		}1221		Ok(())1222	}12231224	/// Create RFT token.1225	///1226	/// The sender should be the owner/admin of the collection or collection should be configured1227	/// to allow public minting.1228	///1229	/// - `data`: Contains list of users who will become the owners of the token pieces and amount1230	///   of token pieces they will receive.1231	pub fn create_item(1232		collection: &RefungibleHandle<T>,1233		sender: &T::CrossAccountId,1234		data: CreateItemData<T>,1235		nesting_budget: &dyn Budget,1236	) -> DispatchResult {1237		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1238	}12391240	/// Repartition RFT token.1241	///1242	/// `repartition` will set token balance of the sender and total amount of token pieces.1243	/// Sender should own all of the token pieces. `repartition' could be done even if some1244	/// token pieces were burned before.1245	///1246	/// - `amount`: Total amount of token pieces that the token will have after `repartition`.1247	pub fn repartition(1248		collection: &RefungibleHandle<T>,1249		owner: &T::CrossAccountId,1250		token: TokenId,1251		amount: u128,1252	) -> DispatchResult {1253		ensure!(1254			amount <= MAX_REFUNGIBLE_PIECES,1255			<Error<T>>::WrongRefungiblePieces1256		);1257		ensure!(amount > 0, <CommonError<T>>::TokenValueTooLow);1258		// Ensure user owns all pieces1259		let total_pieces = Self::total_pieces(collection.id, token).unwrap_or(u128::MAX);1260		let balance = <Balance<T>>::get((collection.id, token, owner));1261		ensure!(1262			total_pieces == balance,1263			<Error<T>>::RepartitionWhileNotOwningAllPieces1264		);12651266		<Balance<T>>::insert((collection.id, token, owner), amount);1267		<TotalSupply<T>>::insert((collection.id, token), amount);12681269		match total_pieces.cmp(&amount) {1270			Ordering::Less => {1271				let mint_amount = amount - total_pieces;1272				<PalletEvm<T>>::deposit_log(1273					ERC20Events::Transfer {1274						from: H160::default(),1275						to: *owner.as_eth(),1276						value: mint_amount.into(),1277					}1278					.to_log(T::EvmTokenAddressMapping::token_to_address(1279						collection.id,1280						token,1281					)),1282				);1283				<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1284					collection.id,1285					token,1286					owner.clone(),1287					mint_amount,1288				));1289			}1290			Ordering::Greater => {1291				let burn_amount = total_pieces - amount;1292				<PalletEvm<T>>::deposit_log(1293					ERC20Events::Transfer {1294						from: *owner.as_eth(),1295						to: H160::default(),1296						value: burn_amount.into(),1297					}1298					.to_log(T::EvmTokenAddressMapping::token_to_address(1299						collection.id,1300						token,1301					)),1302				);1303				<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(1304					collection.id,1305					token,1306					owner.clone(),1307					burn_amount,1308				));1309			}1310			Ordering::Equal => {}1311		}13121313		Ok(())1314	}13151316	fn token_owner(1317		collection_id: CollectionId,1318		token_id: TokenId,1319	) -> Result<T::CrossAccountId, TokenOwnerError> {1320		let mut owner = None;1321		let mut count = 0;1322		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {1323			count += 1;1324			if count > 1 {1325				return Err(TokenOwnerError::MultipleOwners);1326			}1327			owner = Some(key);1328		}1329		owner.ok_or(TokenOwnerError::NotFound)1330	}13311332	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {1333		<TotalSupply<T>>::try_get((collection_id, token_id)).ok()1334	}13351336	pub fn set_collection_properties(1337		collection: &RefungibleHandle<T>,1338		sender: &T::CrossAccountId,1339		properties: Vec<Property>,1340	) -> DispatchResult {1341		<PalletCommon<T>>::set_collection_properties(collection, sender, properties.into_iter())1342	}13431344	pub fn delete_collection_properties(1345		collection: &RefungibleHandle<T>,1346		sender: &T::CrossAccountId,1347		property_keys: Vec<PropertyKey>,1348	) -> DispatchResult {1349		<PalletCommon<T>>::delete_collection_properties(1350			collection,1351			sender,1352			property_keys.into_iter(),1353		)1354	}13551356	pub fn set_token_property_permissions(1357		collection: &RefungibleHandle<T>,1358		sender: &T::CrossAccountId,1359		property_permissions: Vec<PropertyKeyPermission>,1360	) -> DispatchResult {1361		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)1362	}13631364	pub fn token_property_permission(collection_id: CollectionId) -> PropertiesPermissionMap {1365		<PalletCommon<T>>::property_permissions(collection_id)1366	}13671368	pub fn set_scoped_token_property_permissions(1369		collection: &RefungibleHandle<T>,1370		sender: &T::CrossAccountId,1371		scope: PropertyScope,1372		property_permissions: Vec<PropertyKeyPermission>,1373	) -> DispatchResult {1374		<PalletCommon<T>>::set_scoped_token_property_permissions(1375			collection,1376			sender,1377			scope,1378			property_permissions,1379		)1380	}13811382	/// Returns 10 token in no particular order.1383	///1384	/// There is no direct way to get token holders in ascending order,1385	/// since `iter_prefix` returns values in no particular order.1386	/// Therefore, getting the 10 largest holders with a large value of holders1387	/// can lead to impact memory allocation + sorting with  `n * log (n)`.1388	pub fn token_owners(1389		collection_id: CollectionId,1390		token: TokenId,1391	) -> Option<Vec<T::CrossAccountId>> {1392		let res: Vec<T::CrossAccountId> = <Balance<T>>::iter_prefix((collection_id, token))1393			.map(|(owner, _amount)| owner)1394			.take(10)1395			.collect();13961397		if res.is_empty() {1398			None1399		} else {1400			Some(res)1401		}1402	}14031404	/// Sets or unsets the approval of a given operator.1405	///1406	/// The `operator` is allowed to transfer all token pieces of the `owner` on their behalf.1407	/// - `owner`: Token owner1408	/// - `operator`: Operator1409	/// - `approve`: Should operator status be granted or revoked?1410	pub fn set_allowance_for_all(1411		collection: &RefungibleHandle<T>,1412		owner: &T::CrossAccountId,1413		spender: &T::CrossAccountId,1414		approve: bool,1415	) -> DispatchResult {1416		<PalletCommon<T>>::set_allowance_for_all(1417			collection,1418			owner,1419			spender,1420			approve,1421			|| <CollectionAllowance<T>>::insert((collection.id, owner, spender), approve),1422			ERC721Events::ApprovalForAll {1423				owner: *owner.as_eth(),1424				operator: *spender.as_eth(),1425				approved: approve,1426			}1427			.to_log(collection_id_to_address(collection.id)),1428		)1429	}14301431	/// Tells whether the given `owner` approves the `operator`.1432	pub fn allowance_for_all(1433		collection: &RefungibleHandle<T>,1434		owner: &T::CrossAccountId,1435		spender: &T::CrossAccountId,1436	) -> bool {1437		<CollectionAllowance<T>>::get((collection.id, owner, spender))1438	}14391440	pub fn repair_item(collection: &RefungibleHandle<T>, token: TokenId) -> DispatchResult {1441		<TokenProperties<T>>::mutate((collection.id, token), |properties| {1442			properties.recompute_consumed_space();1443		});14441445		Ok(())1446	}1447}