git.delta.rocks / unique-network / refs/commits / 876ef621bd1e

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 codec::{Encode, Decode, MaxEncodedLen};94use core::ops::Deref;95use derivative::Derivative;96use evm_coder::ToLog;97use frame_support::{98	BoundedBTreeMap, BoundedVec, ensure, fail, storage::with_transaction, transactional,99	pallet_prelude::ConstU32,100};101use pallet_evm::{account::CrossAccountId, Pallet as PalletEvm};102use pallet_evm_coder_substrate::WithRecorder;103use pallet_common::{104	CommonCollectionOperations,105	erc::static_property::{key, value},106	Error as CommonError,107	eth::collection_id_to_address,108	Event as CommonEvent, Pallet as PalletCommon,109};110use pallet_structure::Pallet as PalletStructure;111use scale_info::TypeInfo;112use sp_core::H160;113use sp_runtime::{ArithmeticError, DispatchError, DispatchResult, TransactionOutcome};114use sp_std::{vec::Vec, vec, collections::btree_map::BTreeMap};115use up_data_structs::{116	AccessMode, budget::Budget, CollectionId, CollectionFlags, CollectionPropertiesVec,117	CreateCollectionData, CustomDataLimit, mapping::TokenAddressMapping, MAX_ITEMS_PER_BATCH,118	MAX_REFUNGIBLE_PIECES, Property, PropertyKey, PropertyKeyPermission, PropertyPermission,119	PropertyScope, PropertyValue, TokenId, TrySetProperty,120};121122pub use pallet::*;123#[cfg(feature = "runtime-benchmarks")]124pub mod benchmarking;125pub mod common;126pub mod erc;127pub mod erc_token;128pub mod weights;129130#[derive(Derivative, Clone)]131pub struct CreateItemData<CrossAccountId> {132	#[derivative(Debug(format_with = "bounded::map_debug"))]133	pub users: BoundedBTreeMap<CrossAccountId, u128, ConstU32<MAX_ITEMS_PER_BATCH>>,134	#[derivative(Debug(format_with = "bounded::vec_debug"))]135	pub properties: CollectionPropertiesVec,136}137pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;138139/// Token data, stored independently from other data used to describe it140/// for the convenience of database access. Notably contains the token metadata.141#[struct_versioning::versioned(version = 2, upper)]142#[derive(Encode, Decode, Default, TypeInfo, MaxEncodedLen)]143#[deprecated(since = "0.2.0", note = "ItemData is no more contains usefull data")]144pub struct ItemData {145	pub const_data: BoundedVec<u8, CustomDataLimit>,146147	#[version(..2)]148	pub variable_data: BoundedVec<u8, CustomDataLimit>,149}150151#[frame_support::pallet]152pub mod pallet {153	use super::*;154	use frame_support::{155		Blake2_128, Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key,156		traits::StorageVersion,157	};158	use frame_system::pallet_prelude::*;159	use up_data_structs::{CollectionId, TokenId};160	use super::weights::WeightInfo;161162	#[pallet::error]163	pub enum Error<T> {164		/// Not Refungible item data used to mint in Refungible collection.165		NotRefungibleDataUsedToMintFungibleCollectionToken,166		/// Maximum refungibility exceeded.167		WrongRefungiblePieces,168		/// Refungible token can't be repartitioned by user who isn't owns all pieces.169		RepartitionWhileNotOwningAllPieces,170		/// Refungible token can't nest other tokens.171		RefungibleDisallowsNesting,172		/// Setting item properties is not allowed.173		SettingPropertiesNotAllowed,174	}175176	#[pallet::config]177	pub trait Config:178		frame_system::Config + pallet_common::Config + pallet_structure::Config179	{180		type WeightInfo: WeightInfo;181	}182183	const STORAGE_VERSION: StorageVersion = StorageVersion::new(2);184185	#[pallet::pallet]186	#[pallet::storage_version(STORAGE_VERSION)]187	#[pallet::generate_store(pub(super) trait Store)]188	pub struct Pallet<T>(_);189190	/// Total amount of minted tokens in a collection.191	#[pallet::storage]192	pub type TokensMinted<T: Config> =193		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;194195	/// Amount of tokens burnt in a collection.196	#[pallet::storage]197	pub type TokensBurnt<T: Config> =198		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;199200	/// Token data, used to partially describe a token.201	// TODO: remove202	#[pallet::storage]203	#[deprecated(since = "0.2.0", note = "ItemData is no more contains usefull data")]204	pub type TokenData<T: Config> = StorageNMap<205		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),206		Value = ItemData,207		QueryKind = ValueQuery,208	>;209210	/// Amount of pieces a refungible token is split into.211	#[pallet::storage]212	#[pallet::getter(fn token_properties)]213	pub type TokenProperties<T: Config> = StorageNMap<214		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),215		Value = up_data_structs::Properties,216		QueryKind = ValueQuery,217		OnEmpty = up_data_structs::TokenProperties,218	>;219220	/// Total amount of pieces for token221	#[pallet::storage]222	pub type TotalSupply<T: Config> = StorageNMap<223		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),224		Value = u128,225		QueryKind = ValueQuery,226	>;227228	/// Used to enumerate tokens owned by account.229	#[pallet::storage]230	pub type Owned<T: Config> = StorageNMap<231		Key = (232			Key<Twox64Concat, CollectionId>,233			Key<Blake2_128Concat, T::CrossAccountId>,234			Key<Twox64Concat, TokenId>,235		),236		Value = bool,237		QueryKind = ValueQuery,238	>;239240	/// Amount of tokens (not pieces) partially owned by an account within a collection.241	#[pallet::storage]242	pub type AccountBalance<T: Config> = StorageNMap<243		Key = (244			Key<Twox64Concat, CollectionId>,245			// Owner246			Key<Blake2_128Concat, T::CrossAccountId>,247		),248		Value = u32,249		QueryKind = ValueQuery,250	>;251252	/// Amount of token pieces owned by account.253	#[pallet::storage]254	pub type Balance<T: Config> = StorageNMap<255		Key = (256			Key<Twox64Concat, CollectionId>,257			Key<Twox64Concat, TokenId>,258			// Owner259			Key<Blake2_128Concat, T::CrossAccountId>,260		),261		Value = u128,262		QueryKind = ValueQuery,263	>;264265	/// Allowance set by a token owner for another user to perform one of certain transactions on a number of pieces of a token.266	#[pallet::storage]267	pub type Allowance<T: Config> = StorageNMap<268		Key = (269			Key<Twox64Concat, CollectionId>,270			Key<Twox64Concat, TokenId>,271			// Owner272			Key<Blake2_128, T::CrossAccountId>,273			// Spender274			Key<Blake2_128Concat, T::CrossAccountId>,275		),276		Value = u128,277		QueryKind = ValueQuery,278	>;279280	#[pallet::hooks]281	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {282		fn on_runtime_upgrade() -> Weight {283			let storage_version = StorageVersion::get::<Pallet<T>>();284			if storage_version < StorageVersion::new(2) {285				<TokenData<T>>::remove_all(None);286			}287			StorageVersion::new(2).put::<Pallet<T>>();288289			Weight::zero()290		}291	}292}293294pub struct RefungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);295impl<T: Config> RefungibleHandle<T> {296	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {297		Self(inner)298	}299	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {300		self.0301	}302	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {303		&mut self.0304	}305}306307impl<T: Config> RefungibleHandle<T> {308	pub fn supports_metadata(&self) -> bool {309		if let Some(erc721_metadata) =310			pallet_common::Pallet::<T>::get_collection_property(self.id, &key::erc721_metadata())311		{312			*erc721_metadata.into_inner() == *value::ERC721_METADATA_SUPPORTED313		} else {314			false315		}316	}317}318319impl<T: Config> Deref for RefungibleHandle<T> {320	type Target = pallet_common::CollectionHandle<T>;321322	fn deref(&self) -> &Self::Target {323		&self.0324	}325}326327impl<T: Config> WithRecorder<T> for RefungibleHandle<T> {328	fn recorder(&self) -> &pallet_evm_coder_substrate::SubstrateRecorder<T> {329		self.0.recorder()330	}331	fn into_recorder(self) -> pallet_evm_coder_substrate::SubstrateRecorder<T> {332		self.0.into_recorder()333	}334}335336impl<T: Config> Pallet<T> {337	/// Get number of RFT tokens in collection338	pub fn total_supply(collection: &RefungibleHandle<T>) -> u32 {339		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)340	}341342	/// Check that RFT token exists343	///344	/// - `token`: Token ID.345	pub fn token_exists(collection: &RefungibleHandle<T>, token: TokenId) -> bool {346		<TotalSupply<T>>::contains_key((collection.id, token))347	}348349	pub fn set_scoped_token_property(350		collection_id: CollectionId,351		token_id: TokenId,352		scope: PropertyScope,353		property: Property,354	) -> DispatchResult {355		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {356			properties.try_scoped_set(scope, property.key, property.value)357		})358		.map_err(<CommonError<T>>::from)?;359360		Ok(())361	}362363	pub fn set_scoped_token_properties(364		collection_id: CollectionId,365		token_id: TokenId,366		scope: PropertyScope,367		properties: impl Iterator<Item = Property>,368	) -> DispatchResult {369		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {370			stored_properties.try_scoped_set_from_iter(scope, properties)371		})372		.map_err(<CommonError<T>>::from)?;373374		Ok(())375	}376}377378// unchecked calls skips any permission checks379impl<T: Config> Pallet<T> {380	/// Create RFT collection381	///382	/// `init_collection` will take non-refundable deposit for collection creation.383	///384	/// - `data`: Contains settings for collection limits and permissions.385	pub fn init_collection(386		owner: T::CrossAccountId,387		payer: T::CrossAccountId,388		data: CreateCollectionData<T::AccountId>,389	) -> Result<CollectionId, DispatchError> {390		<PalletCommon<T>>::init_collection(owner, payer, data, CollectionFlags::default())391	}392393	/// Destroy RFT collection394	///395	/// `destroy_collection` will throw error if collection contains any tokens.396	/// Only owner can destroy collection.397	pub fn destroy_collection(398		collection: RefungibleHandle<T>,399		sender: &T::CrossAccountId,400	) -> DispatchResult {401		let id = collection.id;402403		if Self::collection_has_tokens(id) {404			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());405		}406407		// =========408409		PalletCommon::destroy_collection(collection.0, sender)?;410411		<TokensMinted<T>>::remove(id);412		<TokensBurnt<T>>::remove(id);413		let _ = <TotalSupply<T>>::clear_prefix((id,), u32::MAX, None);414		let _ = <Balance<T>>::clear_prefix((id,), u32::MAX, None);415		let _ = <Allowance<T>>::clear_prefix((id,), u32::MAX, None);416		let _ = <Owned<T>>::clear_prefix((id,), u32::MAX, None);417		let _ = <AccountBalance<T>>::clear_prefix((id,), u32::MAX, None);418		Ok(())419	}420421	fn collection_has_tokens(collection_id: CollectionId) -> bool {422		<TotalSupply<T>>::iter_prefix((collection_id,))423			.next()424			.is_some()425	}426427	pub fn burn_token_unchecked(428		collection: &RefungibleHandle<T>,429		owner: &T::CrossAccountId,430		token_id: TokenId,431	) -> DispatchResult {432		let burnt = <TokensBurnt<T>>::get(collection.id)433			.checked_add(1)434			.ok_or(ArithmeticError::Overflow)?;435436		<TokensBurnt<T>>::insert(collection.id, burnt);437		<TokenProperties<T>>::remove((collection.id, token_id));438		<TotalSupply<T>>::remove((collection.id, token_id));439		let _ = <Balance<T>>::clear_prefix((collection.id, token_id), u32::MAX, None);440		let _ = <Allowance<T>>::clear_prefix((collection.id, token_id), u32::MAX, None);441		<PalletEvm<T>>::deposit_log(442			ERC721Events::Transfer {443				from: *owner.as_eth(),444				to: H160::default(),445				token_id: token_id.into(),446			}447			.to_log(collection_id_to_address(collection.id)),448		);449		Ok(())450	}451452	/// Burn RFT token pieces453	///454	/// `burn` will decrease total amount of token pieces and amount owned by sender.455	/// `burn` can be called even if there are multiple owners of the RFT token.456	/// If sender wouldn't have any pieces left after `burn` than she will stop being457	/// one of the owners of the token. If there is no account that owns any pieces of458	/// the token than token will be burned too.459	///460	/// - `amount`: Amount of token pieces to burn.461	/// - `token`: Token who's pieces should be burned462	/// - `collection`: Collection that contains the token463	pub fn burn(464		collection: &RefungibleHandle<T>,465		owner: &T::CrossAccountId,466		token: TokenId,467		amount: u128,468	) -> DispatchResult {469		let total_supply = <TotalSupply<T>>::get((collection.id, token))470			.checked_sub(amount)471			.ok_or(<CommonError<T>>::TokenValueTooLow)?;472473		// This was probally last owner of this token?474		if total_supply == 0 {475			// Ensure user actually owns this amount476			ensure!(477				<Balance<T>>::get((collection.id, token, owner)) == amount,478				<CommonError<T>>::TokenValueTooLow479			);480			let account_balance = <AccountBalance<T>>::get((collection.id, owner))481				.checked_sub(1)482				// Should not occur483				.ok_or(ArithmeticError::Underflow)?;484485			// =========486487			<Owned<T>>::remove((collection.id, owner, token));488			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);489			<AccountBalance<T>>::insert((collection.id, owner), account_balance);490			Self::burn_token_unchecked(collection, owner, token)?;491			<PalletEvm<T>>::deposit_log(492				ERC20Events::Transfer {493					from: *owner.as_eth(),494					to: H160::default(),495					value: amount.into(),496				}497				.to_log(collection_id_to_address(collection.id)),498			);499			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(500				collection.id,501				token,502				owner.clone(),503				amount,504			));505			return Ok(());506		}507508		let balance = <Balance<T>>::get((collection.id, token, owner))509			.checked_sub(amount)510			.ok_or(<CommonError<T>>::TokenValueTooLow)?;511		let account_balance = if balance == 0 {512			<AccountBalance<T>>::get((collection.id, owner))513				.checked_sub(1)514				// Should not occur515				.ok_or(ArithmeticError::Underflow)?516		} else {517			0518		};519520		// =========521522		if balance == 0 {523			<Owned<T>>::remove((collection.id, owner, token));524			<PalletStructure<T>>::unnest_if_nested(owner, collection.id, token);525			<Balance<T>>::remove((collection.id, token, owner));526			<AccountBalance<T>>::insert((collection.id, owner), account_balance);527528			if let Some(user) = Self::token_owner(collection.id, token) {529				<PalletEvm<T>>::deposit_log(530					ERC721Events::Transfer {531						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,532						to: *user.as_eth(),533						token_id: token.into(),534					}535					.to_log(collection_id_to_address(collection.id)),536				);537			}538		} else {539			<Balance<T>>::insert((collection.id, token, owner), balance);540		}541		<TotalSupply<T>>::insert((collection.id, token), total_supply);542543		<PalletEvm<T>>::deposit_log(544			ERC20Events::Transfer {545				from: *owner.as_eth(),546				to: H160::default(),547				value: amount.into(),548			}549			.to_log(T::EvmTokenAddressMapping::token_to_address(550				collection.id,551				token,552			)),553		);554		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(555			collection.id,556			token,557			owner.clone(),558			amount,559		));560		Ok(())561	}562563	#[transactional]564	fn modify_token_properties(565		collection: &RefungibleHandle<T>,566		sender: &T::CrossAccountId,567		token_id: TokenId,568		properties: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,569		is_token_create: bool,570		nesting_budget: &dyn Budget,571	) -> DispatchResult {572		let is_collection_admin = || collection.is_owner_or_admin(sender);573		let is_token_owner = || -> Result<bool, DispatchError> {574			let balance = collection.balance(sender.clone(), token_id);575			let total_pieces: u128 =576				Self::total_pieces(collection.id, token_id).unwrap_or(u128::MAX);577			if balance != total_pieces {578				return Ok(false);579			}580581			let is_bundle_owner = <PalletStructure<T>>::check_indirectly_owned(582				sender.clone(),583				collection.id,584				token_id,585				None,586				nesting_budget,587			)?;588589			Ok(is_bundle_owner)590		};591592		for (key, value) in properties {593			let permission = <PalletCommon<T>>::property_permissions(collection.id)594				.get(&key)595				.cloned()596				.unwrap_or_else(PropertyPermission::none);597598			let is_property_exists = TokenProperties::<T>::get((collection.id, token_id))599				.get(&key)600				.is_some();601602			match permission {603				PropertyPermission { mutable: false, .. } if is_property_exists => {604					return Err(<CommonError<T>>::NoPermission.into());605				}606607				PropertyPermission {608					collection_admin,609					token_owner,610					..611				} => {612					//TODO: investigate threats during public minting.613					let is_token_create =614						is_token_create && (collection_admin || token_owner) && value.is_some();615					if !(is_token_create616						|| (collection_admin && is_collection_admin())617						|| (token_owner && is_token_owner()?))618					{619						fail!(<CommonError<T>>::NoPermission);620					}621				}622			}623624			match value {625				Some(value) => {626					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {627						properties.try_set(key.clone(), value)628					})629					.map_err(<CommonError<T>>::from)?;630631					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(632						collection.id,633						token_id,634						key,635					));636				}637				None => {638					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {639						properties.remove(&key)640					})641					.map_err(<CommonError<T>>::from)?;642643					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(644						collection.id,645						token_id,646						key,647					));648				}649			}650		}651652		Ok(())653	}654655	pub fn set_token_properties(656		collection: &RefungibleHandle<T>,657		sender: &T::CrossAccountId,658		token_id: TokenId,659		properties: impl Iterator<Item = Property>,660		is_token_create: bool,661		nesting_budget: &dyn Budget,662	) -> DispatchResult {663		Self::modify_token_properties(664			collection,665			sender,666			token_id,667			properties.map(|p| (p.key, Some(p.value))),668			is_token_create,669			nesting_budget,670		)671	}672673	pub fn set_token_property(674		collection: &RefungibleHandle<T>,675		sender: &T::CrossAccountId,676		token_id: TokenId,677		property: Property,678		nesting_budget: &dyn Budget,679	) -> DispatchResult {680		let is_token_create = false;681682		Self::set_token_properties(683			collection,684			sender,685			token_id,686			[property].into_iter(),687			is_token_create,688			nesting_budget,689		)690	}691692	pub fn delete_token_properties(693		collection: &RefungibleHandle<T>,694		sender: &T::CrossAccountId,695		token_id: TokenId,696		property_keys: impl Iterator<Item = PropertyKey>,697		nesting_budget: &dyn Budget,698	) -> DispatchResult {699		let is_token_create = false;700701		Self::modify_token_properties(702			collection,703			sender,704			token_id,705			property_keys.into_iter().map(|key| (key, None)),706			is_token_create,707			nesting_budget,708		)709	}710711	pub fn delete_token_property(712		collection: &RefungibleHandle<T>,713		sender: &T::CrossAccountId,714		token_id: TokenId,715		property_key: PropertyKey,716		nesting_budget: &dyn Budget,717	) -> DispatchResult {718		Self::delete_token_properties(719			collection,720			sender,721			token_id,722			[property_key].into_iter(),723			nesting_budget,724		)725	}726727	/// Transfer RFT token pieces from one account to another.728	///729	/// If the sender is no longer owns any pieces after the `transfer` than she stops being an owner of the token.730	///731	/// - `from`: Owner of token pieces to transfer.732	/// - `to`: Recepient of transfered token pieces.733	/// - `amount`: Amount of token pieces to transfer.734	/// - `token`: Token whos pieces should be transfered735	/// - `collection`: Collection that contains the token736	pub fn transfer(737		collection: &RefungibleHandle<T>,738		from: &T::CrossAccountId,739		to: &T::CrossAccountId,740		token: TokenId,741		amount: u128,742		nesting_budget: &dyn Budget,743	) -> DispatchResult {744		ensure!(745			collection.limits.transfers_enabled(),746			<CommonError<T>>::TransferNotAllowed747		);748749		if collection.permissions.access() == AccessMode::AllowList {750			collection.check_allowlist(from)?;751			collection.check_allowlist(to)?;752		}753		<PalletCommon<T>>::ensure_correct_receiver(to)?;754755		let initial_balance_from = <Balance<T>>::get((collection.id, token, from));756		let updated_balance_from = initial_balance_from757			.checked_sub(amount)758			.ok_or(<CommonError<T>>::TokenValueTooLow)?;759		let mut create_target = false;760		let from_to_differ = from != to;761		let updated_balance_to = if from != to {762			let old_balance = <Balance<T>>::get((collection.id, token, to));763			if old_balance == 0 {764				create_target = true;765			}766			Some(767				old_balance768					.checked_add(amount)769					.ok_or(ArithmeticError::Overflow)?,770			)771		} else {772			None773		};774775		let account_balance_from = if updated_balance_from == 0 {776			Some(777				<AccountBalance<T>>::get((collection.id, from))778					.checked_sub(1)779					// Should not occur780					.ok_or(ArithmeticError::Underflow)?,781			)782		} else {783			None784		};785		// Account data is created in token, AccountBalance should be increased786		// But only if from != to as we shouldn't check overflow in this case787		let account_balance_to = if create_target && from_to_differ {788			let account_balance_to = <AccountBalance<T>>::get((collection.id, to))789				.checked_add(1)790				.ok_or(ArithmeticError::Overflow)?;791			ensure!(792				account_balance_to < collection.limits.account_token_ownership_limit(),793				<CommonError<T>>::AccountTokenLimitExceeded,794			);795796			Some(account_balance_to)797		} else {798			None799		};800801		// =========802803		<PalletStructure<T>>::nest_if_sent_to_token(804			from.clone(),805			to,806			collection.id,807			token,808			nesting_budget,809		)?;810811		if let Some(updated_balance_to) = updated_balance_to {812			// from != to813			if updated_balance_from == 0 {814				<Balance<T>>::remove((collection.id, token, from));815				<PalletStructure<T>>::unnest_if_nested(from, collection.id, token);816			} else {817				<Balance<T>>::insert((collection.id, token, from), updated_balance_from);818			}819			<Balance<T>>::insert((collection.id, token, to), updated_balance_to);820			if let Some(account_balance_from) = account_balance_from {821				<AccountBalance<T>>::insert((collection.id, from), account_balance_from);822				<Owned<T>>::remove((collection.id, from, token));823			}824			if let Some(account_balance_to) = account_balance_to {825				<AccountBalance<T>>::insert((collection.id, to), account_balance_to);826				<Owned<T>>::insert((collection.id, to, token), true);827			}828		}829830		<PalletEvm<T>>::deposit_log(831			ERC20Events::Transfer {832				from: *from.as_eth(),833				to: *to.as_eth(),834				value: amount.into(),835			}836			.to_log(T::EvmTokenAddressMapping::token_to_address(837				collection.id,838				token,839			)),840		);841842		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(843			collection.id,844			token,845			from.clone(),846			to.clone(),847			amount,848		));849850		let total_supply = <TotalSupply<T>>::get((collection.id, token));851852		if amount == total_supply {853			// if token was fully owned by `from` and will be fully owned by `to` after transfer854			<PalletEvm<T>>::deposit_log(855				ERC721Events::Transfer {856					from: *from.as_eth(),857					to: *to.as_eth(),858					token_id: token.into(),859				}860				.to_log(collection_id_to_address(collection.id)),861			);862		} else if let Some(updated_balance_to) = updated_balance_to {863			// if `from` not equals `to`. This condition is needed to avoid sending event864			// when `from` fully owns token and sends part of token pieces to itself.865			if initial_balance_from == total_supply {866				// if token was fully owned by `from` and will be only partially owned by `to`867				// and `from` after transfer868				<PalletEvm<T>>::deposit_log(869					ERC721Events::Transfer {870						from: *from.as_eth(),871						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,872						token_id: token.into(),873					}874					.to_log(collection_id_to_address(collection.id)),875				);876			} else if updated_balance_to == total_supply {877				// if token was partially owned by `from` and will be fully owned by `to` after transfer878				<PalletEvm<T>>::deposit_log(879					ERC721Events::Transfer {880						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,881						to: *to.as_eth(),882						token_id: token.into(),883					}884					.to_log(collection_id_to_address(collection.id)),885				);886			}887		}888889		Ok(())890	}891892	/// Batched operation to create multiple RFT tokens.893	///894	/// Same as `create_item` but creates multiple tokens.895	///896	/// - `data`: Same as 'data` in `create_item` but contains data for multiple tokens.897	pub fn create_multiple_items(898		collection: &RefungibleHandle<T>,899		sender: &T::CrossAccountId,900		data: Vec<CreateItemData<T::CrossAccountId>>,901		nesting_budget: &dyn Budget,902	) -> DispatchResult {903		if !collection.is_owner_or_admin(sender) {904			ensure!(905				collection.permissions.mint_mode(),906				<CommonError<T>>::PublicMintingNotAllowed907			);908			collection.check_allowlist(sender)?;909910			for item in data.iter() {911				for user in item.users.keys() {912					collection.check_allowlist(user)?;913				}914			}915		}916917		for item in data.iter() {918			for (owner, _) in item.users.iter() {919				<PalletCommon<T>>::ensure_correct_receiver(owner)?;920			}921		}922923		// Total pieces per tokens924		let totals = data925			.iter()926			.map(|data| {927				Ok(data928					.users929					.iter()930					.map(|u| u.1)931					.try_fold(0u128, |acc, v| acc.checked_add(*v))932					.ok_or(ArithmeticError::Overflow)?)933			})934			.collect::<Result<Vec<_>, DispatchError>>()?;935		for total in &totals {936			ensure!(937				*total <= MAX_REFUNGIBLE_PIECES,938				<Error<T>>::WrongRefungiblePieces939			);940		}941942		let first_token_id = <TokensMinted<T>>::get(collection.id);943		let tokens_minted = first_token_id944			.checked_add(data.len() as u32)945			.ok_or(ArithmeticError::Overflow)?;946		ensure!(947			tokens_minted < collection.limits.token_limit(),948			<CommonError<T>>::CollectionTokenLimitExceeded949		);950951		let mut balances = BTreeMap::new();952		for data in &data {953			for owner in data.users.keys() {954				let balance = balances955					.entry(owner)956					.or_insert_with(|| <AccountBalance<T>>::get((collection.id, owner)));957				*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;958959				ensure!(960					*balance <= collection.limits.account_token_ownership_limit(),961					<CommonError<T>>::AccountTokenLimitExceeded,962				);963			}964		}965966		for (i, token) in data.iter().enumerate() {967			let token_id = TokenId(first_token_id + i as u32 + 1);968			for (to, _) in token.users.iter() {969				<PalletStructure<T>>::check_nesting(970					sender.clone(),971					to,972					collection.id,973					token_id,974					nesting_budget,975				)?;976			}977		}978979		// =========980981		with_transaction(|| {982			for (i, data) in data.iter().enumerate() {983				let token_id = first_token_id + i as u32 + 1;984				<TotalSupply<T>>::insert((collection.id, token_id), totals[i]);985986				for (user, amount) in data.users.iter() {987					if *amount == 0 {988						continue;989					}990					<Balance<T>>::insert((collection.id, token_id, &user), amount);991					<Owned<T>>::insert((collection.id, &user, TokenId(token_id)), true);992					<PalletStructure<T>>::nest_if_sent_to_token_unchecked(993						user,994						collection.id,995						TokenId(token_id),996					);997				}998999				if let Err(e) = Self::set_token_properties(1000					collection,1001					sender,1002					TokenId(token_id),1003					data.properties.clone().into_iter(),1004					true,1005					nesting_budget,1006				) {1007					return TransactionOutcome::Rollback(Err(e));1008				}1009			}1010			TransactionOutcome::Commit(Ok(()))1011		})?;10121013		<TokensMinted<T>>::insert(collection.id, tokens_minted);10141015		for (account, balance) in balances {1016			<AccountBalance<T>>::insert((collection.id, account), balance);1017		}10181019		for (i, token) in data.into_iter().enumerate() {1020			let token_id = first_token_id + i as u32 + 1;10211022			let receivers = token1023				.users1024				.into_iter()1025				.filter(|(_, amount)| *amount > 0)1026				.collect::<Vec<_>>();10271028			if let [(user, _)] = receivers.as_slice() {1029				// if there is exactly one receiver1030				<PalletEvm<T>>::deposit_log(1031					ERC721Events::Transfer {1032						from: H160::default(),1033						to: *user.as_eth(),1034						token_id: token_id.into(),1035					}1036					.to_log(collection_id_to_address(collection.id)),1037				);1038			} else if let [_, ..] = receivers.as_slice() {1039				// if there is more than one receiver1040				<PalletEvm<T>>::deposit_log(1041					ERC721Events::Transfer {1042						from: H160::default(),1043						to: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,1044						token_id: token_id.into(),1045					}1046					.to_log(collection_id_to_address(collection.id)),1047				);1048			}10491050			for (user, amount) in receivers.into_iter() {1051				<PalletEvm<T>>::deposit_log(1052					ERC20Events::Transfer {1053						from: H160::default(),1054						to: *user.as_eth(),1055						value: amount.into(),1056					}1057					.to_log(T::EvmTokenAddressMapping::token_to_address(1058						collection.id,1059						TokenId(token_id),1060					)),1061				);1062				<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1063					collection.id,1064					TokenId(token_id),1065					user,1066					amount,1067				));1068			}1069		}1070		Ok(())1071	}10721073	pub fn set_allowance_unchecked(1074		collection: &RefungibleHandle<T>,1075		sender: &T::CrossAccountId,1076		spender: &T::CrossAccountId,1077		token: TokenId,1078		amount: u128,1079	) {1080		if amount == 0 {1081			<Allowance<T>>::remove((collection.id, token, sender, spender));1082		} else {1083			<Allowance<T>>::insert((collection.id, token, sender, spender), amount);1084		}10851086		<PalletEvm<T>>::deposit_log(1087			ERC20Events::Approval {1088				owner: *sender.as_eth(),1089				spender: *spender.as_eth(),1090				value: amount.into(),1091			}1092			.to_log(T::EvmTokenAddressMapping::token_to_address(1093				collection.id,1094				token,1095			)),1096		);1097		<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1098			collection.id,1099			token,1100			sender.clone(),1101			spender.clone(),1102			amount,1103		))1104	}11051106	/// Set allowance for the spender to `transfer` or `burn` sender's token pieces.1107	///1108	/// - `amount`: Amount of token pieces the spender is allowed to `transfer` or `burn.1109	pub fn set_allowance(1110		collection: &RefungibleHandle<T>,1111		sender: &T::CrossAccountId,1112		spender: &T::CrossAccountId,1113		token: TokenId,1114		amount: u128,1115	) -> DispatchResult {1116		if collection.permissions.access() == AccessMode::AllowList {1117			collection.check_allowlist(sender)?;1118			collection.check_allowlist(spender)?;1119		}11201121		<PalletCommon<T>>::ensure_correct_receiver(spender)?;11221123		if <Balance<T>>::get((collection.id, token, sender)) < amount {1124			ensure!(1125				collection.ignores_owned_amount(sender) && Self::token_exists(collection, token),1126				<CommonError<T>>::CantApproveMoreThanOwned1127			);1128		}11291130		// =========11311132		Self::set_allowance_unchecked(collection, sender, spender, token, amount);1133		Ok(())1134	}11351136	/// Returns allowance, which should be set after transaction1137	fn check_allowed(1138		collection: &RefungibleHandle<T>,1139		spender: &T::CrossAccountId,1140		from: &T::CrossAccountId,1141		token: TokenId,1142		amount: u128,1143		nesting_budget: &dyn Budget,1144	) -> Result<Option<u128>, DispatchError> {1145		if spender.conv_eq(from) {1146			return Ok(None);1147		}1148		if collection.permissions.access() == AccessMode::AllowList {1149			// `from`, `to` checked in [`transfer`]1150			collection.check_allowlist(spender)?;1151		}1152		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1153			// TODO: should collection owner be allowed to perform this transfer?1154			ensure!(1155				<PalletStructure<T>>::check_indirectly_owned(1156					spender.clone(),1157					source.0,1158					source.1,1159					None,1160					nesting_budget1161				)?,1162				<CommonError<T>>::ApprovedValueTooLow,1163			);1164			return Ok(None);1165		}1166		let allowance =1167			<Allowance<T>>::get((collection.id, token, from, &spender)).checked_sub(amount);1168		if allowance.is_none() {1169			ensure!(1170				collection.ignores_allowance(spender),1171				<CommonError<T>>::ApprovedValueTooLow1172			);1173		}1174		Ok(allowance)1175	}11761177	/// Transfer RFT token pieces from one account to another.1178	///1179	/// Same as the [`transfer`] but spender doesn't needs to be an owner of the token pieces.1180	/// The owner should set allowance for the spender to transfer pieces.1181	///1182	/// [`transfer`]: struct.Pallet.html#method.transfer1183	pub fn transfer_from(1184		collection: &RefungibleHandle<T>,1185		spender: &T::CrossAccountId,1186		from: &T::CrossAccountId,1187		to: &T::CrossAccountId,1188		token: TokenId,1189		amount: u128,1190		nesting_budget: &dyn Budget,1191	) -> DispatchResult {1192		let allowance =1193			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;11941195		// =========11961197		Self::transfer(collection, from, to, token, amount, nesting_budget)?;1198		if let Some(allowance) = allowance {1199			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1200		}1201		Ok(())1202	}12031204	/// Burn RFT token pieces from the account.1205	///1206	/// Same as the [`burn`] but spender doesn't need to be an owner of the token pieces. The owner should1207	/// set allowance for the spender to burn pieces1208	///1209	/// [`burn`]: struct.Pallet.html#method.burn1210	pub fn burn_from(1211		collection: &RefungibleHandle<T>,1212		spender: &T::CrossAccountId,1213		from: &T::CrossAccountId,1214		token: TokenId,1215		amount: u128,1216		nesting_budget: &dyn Budget,1217	) -> DispatchResult {1218		let allowance =1219			Self::check_allowed(collection, spender, from, token, amount, nesting_budget)?;12201221		// =========12221223		Self::burn(collection, from, token, amount)?;1224		if let Some(allowance) = allowance {1225			Self::set_allowance_unchecked(collection, from, spender, token, allowance);1226		}1227		Ok(())1228	}12291230	/// Create RFT token.1231	///1232	/// The sender should be the owner/admin of the collection or collection should be configured1233	/// to allow public minting.1234	///1235	/// - `data`: Contains list of users who will become the owners of the token pieces and amount1236	///   of token pieces they will receive.1237	pub fn create_item(1238		collection: &RefungibleHandle<T>,1239		sender: &T::CrossAccountId,1240		data: CreateItemData<T::CrossAccountId>,1241		nesting_budget: &dyn Budget,1242	) -> DispatchResult {1243		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1244	}12451246	/// Repartition RFT token.1247	///1248	/// `repartition` will set token balance of the sender and total amount of token pieces.1249	/// Sender should own all of the token pieces. `repartition' could be done even if some1250	/// token pieces were burned before.1251	///1252	/// - `amount`: Total amount of token pieces that the token will have after `repartition`.1253	pub fn repartition(1254		collection: &RefungibleHandle<T>,1255		owner: &T::CrossAccountId,1256		token: TokenId,1257		amount: u128,1258	) -> DispatchResult {1259		ensure!(1260			amount <= MAX_REFUNGIBLE_PIECES,1261			<Error<T>>::WrongRefungiblePieces1262		);1263		ensure!(amount > 0, <CommonError<T>>::TokenValueTooLow);1264		// Ensure user owns all pieces1265		let total_pieces = Self::total_pieces(collection.id, token).unwrap_or(u128::MAX);1266		let balance = <Balance<T>>::get((collection.id, token, owner));1267		ensure!(1268			total_pieces == balance,1269			<Error<T>>::RepartitionWhileNotOwningAllPieces1270		);12711272		<Balance<T>>::insert((collection.id, token, owner), amount);1273		<TotalSupply<T>>::insert((collection.id, token), amount);12741275		if amount > total_pieces {1276			let mint_amount = amount - total_pieces;1277			<PalletEvm<T>>::deposit_log(1278				ERC20Events::Transfer {1279					from: H160::default(),1280					to: *owner.as_eth(),1281					value: mint_amount.into(),1282				}1283				.to_log(T::EvmTokenAddressMapping::token_to_address(1284					collection.id,1285					token,1286				)),1287			);1288			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1289				collection.id,1290				token,1291				owner.clone(),1292				mint_amount,1293			));1294		} else if total_pieces > amount {1295			let burn_amount = total_pieces - amount;1296			<PalletEvm<T>>::deposit_log(1297				ERC20Events::Transfer {1298					from: *owner.as_eth(),1299					to: H160::default(),1300					value: burn_amount.into(),1301				}1302				.to_log(T::EvmTokenAddressMapping::token_to_address(1303					collection.id,1304					token,1305				)),1306			);1307			<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(1308				collection.id,1309				token,1310				owner.clone(),1311				burn_amount,1312			));1313		}13141315		Ok(())1316	}13171318	fn token_owner(collection_id: CollectionId, token_id: TokenId) -> Option<T::CrossAccountId> {1319		let mut owner = None;1320		let mut count = 0;1321		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {1322			count += 1;1323			if count > 1 {1324				return None;1325			}1326			owner = Some(key);1327		}1328		owner1329	}13301331	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {1332		<TotalSupply<T>>::try_get((collection_id, token_id)).ok()1333	}13341335	pub fn set_collection_properties(1336		collection: &RefungibleHandle<T>,1337		sender: &T::CrossAccountId,1338		properties: Vec<Property>,1339	) -> DispatchResult {1340		<PalletCommon<T>>::set_collection_properties(collection, sender, properties)1341	}13421343	pub fn delete_collection_properties(1344		collection: &RefungibleHandle<T>,1345		sender: &T::CrossAccountId,1346		property_keys: Vec<PropertyKey>,1347	) -> DispatchResult {1348		<PalletCommon<T>>::delete_collection_properties(collection, sender, property_keys)1349	}13501351	pub fn set_token_property_permissions(1352		collection: &RefungibleHandle<T>,1353		sender: &T::CrossAccountId,1354		property_permissions: Vec<PropertyKeyPermission>,1355	) -> DispatchResult {1356		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)1357	}13581359	pub fn set_scoped_token_property_permissions(1360		collection: &RefungibleHandle<T>,1361		sender: &T::CrossAccountId,1362		scope: PropertyScope,1363		property_permissions: Vec<PropertyKeyPermission>,1364	) -> DispatchResult {1365		<PalletCommon<T>>::set_scoped_token_property_permissions(1366			collection,1367			sender,1368			scope,1369			property_permissions,1370		)1371	}13721373	/// Returns 10 token in no particular order.1374	///1375	/// There is no direct way to get token holders in ascending order,1376	/// since `iter_prefix` returns values in no particular order.1377	/// Therefore, getting the 10 largest holders with a large value of holders1378	/// can lead to impact memory allocation + sorting with  `n * log (n)`.1379	pub fn token_owners(1380		collection_id: CollectionId,1381		token: TokenId,1382	) -> Option<Vec<T::CrossAccountId>> {1383		let res: Vec<T::CrossAccountId> = <Balance<T>>::iter_prefix((collection_id, token))1384			.map(|(owner, _amount)| owner)1385			.take(10)1386			.collect();13871388		if res.is_empty() {1389			None1390		} else {1391			Some(res)1392		}1393	}1394}