git.delta.rocks / unique-network / refs/commits / 6020bb04e7f4

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#![cfg_attr(not(feature = "std"), no_std)]1819use erc::ERC721Events;20use evm_coder::ToLog;21use frame_support::{BoundedVec, ensure, fail};22use up_data_structs::{23	AccessMode, CollectionId, CustomDataLimit, TokenId, CreateCollectionData, CreateNftExData,24	mapping::TokenAddressMapping, NestingRule, budget::Budget, Property, PropertyPermission,25	PropertyKey, PropertyKeyPermission, Properties, TrySet,26};27use pallet_evm::{account::CrossAccountId, Pallet as PalletEvm};28use pallet_common::{29	Error as CommonError, Pallet as PalletCommon, Event as CommonEvent, CollectionHandle,30	dispatch::CollectionDispatch, eth::collection_id_to_address,31};32use pallet_structure::Pallet as PalletStructure;33use pallet_evm_coder_substrate::{SubstrateRecorder, WithRecorder};34use sp_core::H160;35use sp_runtime::{ArithmeticError, DispatchError, DispatchResult};36use sp_std::{vec::Vec, vec};37use core::ops::Deref;38use sp_std::collections::btree_map::BTreeMap;39use codec::{Encode, Decode, MaxEncodedLen};40use scale_info::TypeInfo;4142pub use pallet::*;43#[cfg(feature = "runtime-benchmarks")]44pub mod benchmarking;45pub mod common;46pub mod erc;47pub mod weights;4849pub type CreateItemData<T> = CreateNftExData<<T as pallet_evm::account::Config>::CrossAccountId>;50pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;5152#[struct_versioning::versioned(version = 2, upper)]53#[derive(Encode, Decode, TypeInfo, MaxEncodedLen)]54pub struct ItemData<CrossAccountId> {55	pub const_data: BoundedVec<u8, CustomDataLimit>,5657	#[version(..2)]58	pub variable_data: BoundedVec<u8, CustomDataLimit>,5960	pub owner: CrossAccountId,61}6263#[frame_support::pallet]64pub mod pallet {65	use super::*;66	use frame_support::{Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key, traits::StorageVersion};67	use frame_system::pallet_prelude::*;68	use up_data_structs::{CollectionId, TokenId};69	use super::weights::WeightInfo;7071	#[pallet::error]72	pub enum Error<T> {73		/// Not Nonfungible item data used to mint in Nonfungible collection.74		NotNonfungibleDataUsedToMintFungibleCollectionToken,75		/// Used amount > 1 with NFT76		NonfungibleItemsHaveNoAmount,77	}7879	#[pallet::config]80	pub trait Config:81		frame_system::Config + pallet_common::Config + pallet_structure::Config + pallet_evm::Config82	{83		type WeightInfo: WeightInfo;84	}8586	const STORAGE_VERSION: StorageVersion = StorageVersion::new(1);8788	#[pallet::pallet]89	#[pallet::storage_version(STORAGE_VERSION)]90	#[pallet::generate_store(pub(super) trait Store)]91	pub struct Pallet<T>(_);9293	#[pallet::storage]94	pub type TokensMinted<T: Config> =95		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;96	#[pallet::storage]97	pub type TokensBurnt<T: Config> =98		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;99100	#[pallet::storage]101	pub type TokenData<T: Config> = StorageNMap<102		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),103		Value = ItemData<T::CrossAccountId>,104		QueryKind = OptionQuery,105	>;106107	#[pallet::storage]108	#[pallet::getter(fn token_properties)]109	pub type TokenProperties<T: Config> = StorageNMap<110		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),111		Value = Properties,112		QueryKind = ValueQuery,113		OnEmpty = up_data_structs::TokenProperties,114	>;115116	/// Used to enumerate tokens owned by account117	#[pallet::storage]118	pub type Owned<T: Config> = StorageNMap<119		Key = (120			Key<Twox64Concat, CollectionId>,121			Key<Blake2_128Concat, T::CrossAccountId>,122			Key<Twox64Concat, TokenId>,123		),124		Value = bool,125		QueryKind = ValueQuery,126	>;127128	#[pallet::storage]129	pub type AccountBalance<T: Config> = StorageNMap<130		Key = (131			Key<Twox64Concat, CollectionId>,132			Key<Blake2_128Concat, T::CrossAccountId>,133		),134		Value = u32,135		QueryKind = ValueQuery,136	>;137138	#[pallet::storage]139	pub type Allowance<T: Config> = StorageNMap<140		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),141		Value = T::CrossAccountId,142		QueryKind = OptionQuery,143	>;144145	#[pallet::hooks]146	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {147		fn on_runtime_upgrade() -> Weight {148			if StorageVersion::get::<Pallet<T>>() < StorageVersion::new(1) {149				<TokenData<T>>::translate_values::<ItemDataVersion1<T::CrossAccountId>, _>(|v| {150					Some(<ItemDataVersion2<T::CrossAccountId>>::from(v))151				})152			}153154			0155		}156	}157}158159pub struct NonfungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);160impl<T: Config> NonfungibleHandle<T> {161	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {162		Self(inner)163	}164	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {165		self.0166	}167	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {168		&mut self.0169	}170}171impl<T: Config> WithRecorder<T> for NonfungibleHandle<T> {172	fn recorder(&self) -> &SubstrateRecorder<T> {173		self.0.recorder()174	}175	fn into_recorder(self) -> SubstrateRecorder<T> {176		self.0.into_recorder()177	}178}179impl<T: Config> Deref for NonfungibleHandle<T> {180	type Target = pallet_common::CollectionHandle<T>;181182	fn deref(&self) -> &Self::Target {183		&self.0184	}185}186187impl<T: Config> Pallet<T> {188	pub fn total_supply(collection: &NonfungibleHandle<T>) -> u32 {189		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)190	}191	pub fn token_exists(collection: &NonfungibleHandle<T>, token: TokenId) -> bool {192		<TokenData<T>>::contains_key((collection.id, token))193	}194}195196// unchecked calls skips any permission checks197impl<T: Config> Pallet<T> {198	pub fn init_collection(199		owner: T::AccountId,200		data: CreateCollectionData<T::AccountId>,201	) -> Result<CollectionId, DispatchError> {202		<PalletCommon<T>>::init_collection(owner, data)203	}204	pub fn destroy_collection(205		collection: NonfungibleHandle<T>,206		sender: &T::CrossAccountId,207	) -> DispatchResult {208		let id = collection.id;209210		// =========211212		PalletCommon::destroy_collection(collection.0, sender)?;213214		<TokenData<T>>::remove_prefix((id,), None);215		<Owned<T>>::remove_prefix((id,), None);216		<TokensMinted<T>>::remove(id);217		<TokensBurnt<T>>::remove(id);218		<Allowance<T>>::remove_prefix((id,), None);219		<AccountBalance<T>>::remove_prefix((id,), None);220		Ok(())221	}222223	pub fn burn(224		collection: &NonfungibleHandle<T>,225		sender: &T::CrossAccountId,226		token: TokenId,227	) -> DispatchResult {228		let token_data =229			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;230		ensure!(231			&token_data.owner == sender232				|| (collection.limits.owner_can_transfer() && collection.is_owner_or_admin(sender)),233			<CommonError<T>>::NoPermission234		);235236		if collection.access == AccessMode::AllowList {237			collection.check_allowlist(sender)?;238		}239240		let burnt = <TokensBurnt<T>>::get(collection.id)241			.checked_add(1)242			.ok_or(ArithmeticError::Overflow)?;243244		let balance = <AccountBalance<T>>::get((collection.id, token_data.owner.clone()))245			.checked_sub(1)246			.ok_or(ArithmeticError::Overflow)?;247248		if balance == 0 {249			<AccountBalance<T>>::remove((collection.id, token_data.owner.clone()));250		} else {251			<AccountBalance<T>>::insert((collection.id, token_data.owner.clone()), balance);252		}253		// =========254255		<Owned<T>>::remove((collection.id, &token_data.owner, token));256		<TokensBurnt<T>>::insert(collection.id, burnt);257		<TokenData<T>>::remove((collection.id, token));258		let old_spender = <Allowance<T>>::take((collection.id, token));259260		if let Some(old_spender) = old_spender {261			<PalletCommon<T>>::deposit_event(CommonEvent::Approved(262				collection.id,263				token,264				sender.clone(),265				old_spender,266				0,267			));268		}269270		<PalletEvm<T>>::deposit_log(271			ERC721Events::Transfer {272				from: *token_data.owner.as_eth(),273				to: H160::default(),274				token_id: token.into(),275			}276			.to_log(collection_id_to_address(collection.id)),277		);278		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(279			collection.id,280			token,281			token_data.owner,282			1,283		));284		Ok(())285	}286287	pub fn set_token_property(288		collection: &NonfungibleHandle<T>,289		sender: &T::CrossAccountId,290		token_id: TokenId,291		property: Property,292	) -> DispatchResult {293		Self::check_token_change_permission(collection, sender, token_id, &property.key)?;294295		<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {296			let property = property.clone();297			properties.try_set(property.key, property.value)298		})299		.map_err(<CommonError<T>>::from)?;300301		<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(302			collection.id,303			token_id,304			property.key,305		));306307		Ok(())308	}309310	pub fn set_token_properties(311		collection: &NonfungibleHandle<T>,312		sender: &T::CrossAccountId,313		token_id: TokenId,314		properties: Vec<Property>,315	) -> DispatchResult {316		for property in properties {317			Self::set_token_property(collection, sender, token_id, property)?;318		}319320		Ok(())321	}322323	pub fn delete_token_property(324		collection: &NonfungibleHandle<T>,325		sender: &T::CrossAccountId,326		token_id: TokenId,327		property_key: PropertyKey,328	) -> DispatchResult {329		Self::check_token_change_permission(collection, sender, token_id, &property_key)?;330331		<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {332			properties.remove(&property_key)333		})334		.map_err(<CommonError<T>>::from)?;335336		<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(337			collection.id,338			token_id,339			property_key,340		));341342		Ok(())343	}344345	fn check_token_change_permission(346		collection: &NonfungibleHandle<T>,347		sender: &T::CrossAccountId,348		token_id: TokenId,349		property_key: &PropertyKey,350	) -> DispatchResult {351		let permission = <PalletCommon<T>>::property_permissions(collection.id)352			.get(property_key)353			.map(|p| p.clone())354			.unwrap_or(PropertyPermission::none());355356		let token_data = <TokenData<T>>::get((collection.id, token_id))357			.ok_or(<CommonError<T>>::TokenNotFound)?;358359		let check_token_owner = || -> DispatchResult {360			ensure!(&token_data.owner == sender, <CommonError<T>>::NoPermission);361			Ok(())362		};363364		let is_property_exists = TokenProperties::<T>::get((collection.id, token_id))365			.get(property_key)366			.is_some();367368		match permission {369			PropertyPermission { mutable: false, .. } if is_property_exists => {370				Err(<CommonError<T>>::NoPermission.into())371			}372373			PropertyPermission {374				collection_admin,375				token_owner,376				..377			} => {378				let mut check_result = Err(<CommonError<T>>::NoPermission.into());379380				if collection_admin {381					check_result = collection.check_is_owner_or_admin(sender);382				}383384				if token_owner {385					check_result.or_else(|_| check_token_owner())386				} else {387					check_result388				}389			}390		}391	}392393	pub fn delete_token_properties(394		collection: &NonfungibleHandle<T>,395		sender: &T::CrossAccountId,396		token_id: TokenId,397		property_keys: Vec<PropertyKey>,398	) -> DispatchResult {399		for key in property_keys {400			Self::delete_token_property(collection, sender, token_id, key)?;401		}402403		Ok(())404	}405406	pub fn set_collection_properties(407		collection: &NonfungibleHandle<T>,408		sender: &T::CrossAccountId,409		properties: Vec<Property>,410	) -> DispatchResult {411		<PalletCommon<T>>::set_collection_properties(collection, sender, properties)412	}413414	pub fn delete_collection_properties(415		collection: &CollectionHandle<T>,416		sender: &T::CrossAccountId,417		property_keys: Vec<PropertyKey>,418	) -> DispatchResult {419		<PalletCommon<T>>::delete_collection_properties(collection, sender, property_keys)420	}421422	pub fn set_property_permissions(423		collection: &CollectionHandle<T>,424		sender: &T::CrossAccountId,425		property_permissions: Vec<PropertyKeyPermission>,426	) -> DispatchResult {427		<PalletCommon<T>>::set_property_permissions(collection, sender, property_permissions)428	}429430	pub fn transfer(431		collection: &NonfungibleHandle<T>,432		from: &T::CrossAccountId,433		to: &T::CrossAccountId,434		token: TokenId,435		nesting_budget: &dyn Budget,436	) -> DispatchResult {437		ensure!(438			collection.limits.transfers_enabled(),439			<CommonError<T>>::TransferNotAllowed440		);441442		let token_data =443			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;444		// TODO: require sender to be token, owner, require admins to go through transfer_from445		ensure!(446			&token_data.owner == from447				|| (collection.limits.owner_can_transfer() && collection.is_owner_or_admin(from)),448			<CommonError<T>>::NoPermission449		);450451		if collection.access == AccessMode::AllowList {452			collection.check_allowlist(from)?;453			collection.check_allowlist(to)?;454		}455		<PalletCommon<T>>::ensure_correct_receiver(to)?;456457		let balance_from = <AccountBalance<T>>::get((collection.id, from))458			.checked_sub(1)459			.ok_or(<CommonError<T>>::TokenValueTooLow)?;460		let balance_to = if from != to {461			let balance_to = <AccountBalance<T>>::get((collection.id, to))462				.checked_add(1)463				.ok_or(ArithmeticError::Overflow)?;464465			ensure!(466				balance_to < collection.limits.account_token_ownership_limit(),467				<CommonError<T>>::AccountTokenLimitExceeded,468			);469470			Some(balance_to)471		} else {472			None473		};474475		if let Some(target) = T::CrossTokenAddressMapping::address_to_token(to) {476			let handle = <CollectionHandle<T>>::try_get(target.0)?;477			let dispatch = T::CollectionDispatch::dispatch(handle);478			let dispatch = dispatch.as_dyn();479480			dispatch.check_nesting(481				from.clone(),482				(collection.id, token),483				target.1,484				nesting_budget,485			)?;486		}487488		// =========489490		<TokenData<T>>::insert(491			(collection.id, token),492			ItemData {493				owner: to.clone(),494				..token_data495			},496		);497498		if let Some(balance_to) = balance_to {499			// from != to500			if balance_from == 0 {501				<AccountBalance<T>>::remove((collection.id, from));502			} else {503				<AccountBalance<T>>::insert((collection.id, from), balance_from);504			}505			<AccountBalance<T>>::insert((collection.id, to), balance_to);506			<Owned<T>>::remove((collection.id, from, token));507			<Owned<T>>::insert((collection.id, to, token), true);508		}509		Self::set_allowance_unchecked(collection, from, token, None, true);510511		<PalletEvm<T>>::deposit_log(512			ERC721Events::Transfer {513				from: *from.as_eth(),514				to: *to.as_eth(),515				token_id: token.into(),516			}517			.to_log(collection_id_to_address(collection.id)),518		);519		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(520			collection.id,521			token,522			from.clone(),523			to.clone(),524			1,525		));526		Ok(())527	}528529	pub fn create_multiple_items(530		collection: &NonfungibleHandle<T>,531		sender: &T::CrossAccountId,532		data: Vec<CreateItemData<T>>,533		nesting_budget: &dyn Budget,534	) -> DispatchResult {535		if !collection.is_owner_or_admin(sender) {536			ensure!(537				collection.mint_mode,538				<CommonError<T>>::PublicMintingNotAllowed539			);540			collection.check_allowlist(sender)?;541542			for item in data.iter() {543				collection.check_allowlist(&item.owner)?;544			}545		}546547		for data in data.iter() {548			<PalletCommon<T>>::ensure_correct_receiver(&data.owner)?;549		}550551		let first_token = <TokensMinted<T>>::get(collection.id);552		let tokens_minted = first_token553			.checked_add(data.len() as u32)554			.ok_or(ArithmeticError::Overflow)?;555		ensure!(556			tokens_minted <= collection.limits.token_limit(),557			<CommonError<T>>::CollectionTokenLimitExceeded558		);559560		let mut balances = BTreeMap::new();561		for data in &data {562			let balance = balances563				.entry(&data.owner)564				.or_insert_with(|| <AccountBalance<T>>::get((collection.id, &data.owner)));565			*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;566567			ensure!(568				*balance <= collection.limits.account_token_ownership_limit(),569				<CommonError<T>>::AccountTokenLimitExceeded,570			);571		}572573		for (i, data) in data.iter().enumerate() {574			let token = TokenId(first_token + i as u32 + 1);575			if let Some(target) = T::CrossTokenAddressMapping::address_to_token(&data.owner) {576				let handle = <CollectionHandle<T>>::try_get(target.0)?;577				let dispatch = T::CollectionDispatch::dispatch(handle);578				let dispatch = dispatch.as_dyn();579				dispatch.check_nesting(580					sender.clone(),581					(collection.id, token),582					target.1,583					nesting_budget,584				)?;585			}586		}587588		// =========589590		<TokensMinted<T>>::insert(collection.id, tokens_minted);591		for (account, balance) in balances {592			<AccountBalance<T>>::insert((collection.id, account), balance);593		}594		for (i, data) in data.into_iter().enumerate() {595			let token = first_token + i as u32 + 1;596597			<TokenData<T>>::insert(598				(collection.id, token),599				ItemData {600					const_data: data.const_data,601					owner: data.owner.clone(),602				},603			);604			<Owned<T>>::insert((collection.id, &data.owner, token), true);605606			Self::set_token_properties(607				collection,608				sender,609				TokenId(token),610				data.properties.into_inner(),611			)?;612613			<PalletEvm<T>>::deposit_log(614				ERC721Events::Transfer {615					from: H160::default(),616					to: *data.owner.as_eth(),617					token_id: token.into(),618				}619				.to_log(collection_id_to_address(collection.id)),620			);621			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(622				collection.id,623				TokenId(token),624				data.owner.clone(),625				1,626			));627		}628		Ok(())629	}630631	pub fn set_allowance_unchecked(632		collection: &NonfungibleHandle<T>,633		sender: &T::CrossAccountId,634		token: TokenId,635		spender: Option<&T::CrossAccountId>,636		assume_implicit_eth: bool,637	) {638		if let Some(spender) = spender {639			let old_spender = <Allowance<T>>::get((collection.id, token));640			<Allowance<T>>::insert((collection.id, token), spender);641			// In ERC721 there is only one possible approved user of token, so we set642			// approved user to spender643			<PalletEvm<T>>::deposit_log(644				ERC721Events::Approval {645					owner: *sender.as_eth(),646					approved: *spender.as_eth(),647					token_id: token.into(),648				}649				.to_log(collection_id_to_address(collection.id)),650			);651			// In Unique chain, any token can have any amount of approved users, so we need to652			// set allowance of old owner to 0, and allowance of new owner to 1653			if old_spender.as_ref() != Some(spender) {654				if let Some(old_owner) = old_spender {655					<PalletCommon<T>>::deposit_event(CommonEvent::Approved(656						collection.id,657						token,658						sender.clone(),659						old_owner,660						0,661					));662				}663				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(664					collection.id,665					token,666					sender.clone(),667					spender.clone(),668					1,669				));670			}671		} else {672			let old_spender = <Allowance<T>>::take((collection.id, token));673			if !assume_implicit_eth {674				// In ERC721 there is only one possible approved user of token, so we set675				// approved user to zero address676				<PalletEvm<T>>::deposit_log(677					ERC721Events::Approval {678						owner: *sender.as_eth(),679						approved: H160::default(),680						token_id: token.into(),681					}682					.to_log(collection_id_to_address(collection.id)),683				);684			}685			// In Unique chain, any token can have any amount of approved users, so we need to686			// set allowance of old owner to 0687			if let Some(old_spender) = old_spender {688				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(689					collection.id,690					token,691					sender.clone(),692					old_spender,693					0,694				));695			}696		}697	}698699	pub fn set_allowance(700		collection: &NonfungibleHandle<T>,701		sender: &T::CrossAccountId,702		token: TokenId,703		spender: Option<&T::CrossAccountId>,704	) -> DispatchResult {705		if collection.access == AccessMode::AllowList {706			collection.check_allowlist(sender)?;707			if let Some(spender) = spender {708				collection.check_allowlist(spender)?;709			}710		}711712		if let Some(spender) = spender {713			<PalletCommon<T>>::ensure_correct_receiver(spender)?;714		}715		let token_data =716			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;717		if &token_data.owner != sender {718			ensure!(719				collection.ignores_owned_amount(sender),720				<CommonError<T>>::CantApproveMoreThanOwned721			);722		}723724		// =========725726		Self::set_allowance_unchecked(collection, sender, token, spender, false);727		Ok(())728	}729730	fn check_allowed(731		collection: &NonfungibleHandle<T>,732		spender: &T::CrossAccountId,733		from: &T::CrossAccountId,734		token: TokenId,735		nesting_budget: &dyn Budget,736	) -> DispatchResult {737		if spender.conv_eq(from) {738			return Ok(());739		}740		if collection.access == AccessMode::AllowList {741			// `from`, `to` checked in [`transfer`]742			collection.check_allowlist(spender)?;743		}744		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {745			// TODO: should collection owner be allowed to perform this transfer?746			ensure!(747				<PalletStructure<T>>::check_indirectly_owned(748					spender.clone(),749					source.0,750					source.1,751					None,752					nesting_budget753				)?,754				<CommonError<T>>::ApprovedValueTooLow,755			);756			return Ok(());757		}758		if <Allowance<T>>::get((collection.id, token)).as_ref() == Some(spender) {759			return Ok(());760		}761		ensure!(762			collection.ignores_allowance(spender),763			<CommonError<T>>::ApprovedValueTooLow764		);765		Ok(())766	}767768	pub fn transfer_from(769		collection: &NonfungibleHandle<T>,770		spender: &T::CrossAccountId,771		from: &T::CrossAccountId,772		to: &T::CrossAccountId,773		token: TokenId,774		nesting_budget: &dyn Budget,775	) -> DispatchResult {776		Self::check_allowed(collection, spender, from, token, nesting_budget)?;777778		// =========779780		// Allowance is reset in [`transfer`]781		Self::transfer(collection, from, to, token, nesting_budget)782	}783784	pub fn burn_from(785		collection: &NonfungibleHandle<T>,786		spender: &T::CrossAccountId,787		from: &T::CrossAccountId,788		token: TokenId,789		nesting_budget: &dyn Budget,790	) -> DispatchResult {791		Self::check_allowed(collection, spender, from, token, nesting_budget)?;792793		// =========794795		Self::burn(collection, from, token)796	}797798	pub fn check_nesting(799		handle: &NonfungibleHandle<T>,800		sender: T::CrossAccountId,801		from: (CollectionId, TokenId),802		under: TokenId,803		nesting_budget: &dyn Budget,804	) -> DispatchResult {805		fn ensure_sender_allowed<T: Config>(806			collection: CollectionId,807			token: TokenId,808			for_nest: (CollectionId, TokenId),809			sender: T::CrossAccountId,810			budget: &dyn Budget,811		) -> DispatchResult {812			ensure!(813				<PalletStructure<T>>::check_indirectly_owned(814					sender,815					collection,816					token,817					Some(for_nest),818					budget819				)?,820				<CommonError<T>>::OnlyOwnerAllowedToNest,821			);822			Ok(())823		}824		match handle.limits.nesting_rule() {825			NestingRule::Disabled => fail!(<CommonError<T>>::NestingIsDisabled),826			NestingRule::Owner => {827				ensure_sender_allowed::<T>(handle.id, under, from, sender, nesting_budget)?828			}829			NestingRule::OwnerRestricted(whitelist) => {830				ensure!(831					whitelist.contains(&from.0),832					<CommonError<T>>::SourceCollectionIsNotAllowedToNest833				);834				ensure_sender_allowed::<T>(handle.id, under, from, sender, nesting_budget)?835			}836		}837		Ok(())838	}839840	/// Delegated to `create_multiple_items`841	pub fn create_item(842		collection: &NonfungibleHandle<T>,843		sender: &T::CrossAccountId,844		data: CreateItemData<T>,845		nesting_budget: &dyn Budget,846	) -> DispatchResult {847		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)848	}849}