git.delta.rocks / unique-network / refs/commits / 48f959311e08

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//! # Nonfungible Pallet EVM API18//!19//! Provides ERC-721 standart support implementation and EVM API for unique extensions for Nonfungible Pallet.20//! Method implementations are mostly doing parameter conversion and calling Nonfungible Pallet methods.2122extern crate alloc;23use core::{24	char::{REPLACEMENT_CHARACTER, decode_utf16},25	convert::TryInto,26};27use evm_coder::{ToLog, execution::*, generate_stubgen, solidity, solidity_interface, types::*, weight};28use frame_support::BoundedVec;29use up_data_structs::{30	TokenId, PropertyPermission, PropertyKeyPermission, Property, CollectionId, PropertyKey,31	CollectionPropertiesVec,32};33use pallet_evm_coder_substrate::dispatch_to_evm;34use sp_std::vec::Vec;35use pallet_common::{36	erc::{37		CommonEvmHandler, PrecompileResult, CollectionCall, static_property::key,38		static_property::value,39	},40	CollectionHandle, CollectionPropertyPermissions,41};42use pallet_evm::{account::CrossAccountId, PrecompileHandle};43use pallet_evm_coder_substrate::call;44use pallet_structure::{SelfWeightOf as StructureWeight, weights::WeightInfo as _};4546use crate::{47	AccountBalance, Config, CreateItemData, NonfungibleHandle, Pallet, TokenData, TokensMinted,48	SelfWeightOf, weights::WeightInfo, TokenProperties,49};5051/// @title A contract that allows to set and delete token properties and change token property permissions.52#[solidity_interface(name = TokenProperties)]53impl<T: Config> NonfungibleHandle<T> {54	/// @notice Set permissions for token property.55	/// @dev Throws error if `msg.sender` is not admin or owner of the collection.56	/// @param key Property key.57	/// @param isMutable Permission to mutate property.58	/// @param collectionAdmin Permission to mutate property by collection admin if property is mutable.59	/// @param tokenOwner Permission to mutate property by token owner if property is mutable.60	fn set_token_property_permission(61		&mut self,62		caller: caller,63		key: string,64		is_mutable: bool,65		collection_admin: bool,66		token_owner: bool,67	) -> Result<()> {68		let caller = T::CrossAccountId::from_eth(caller);69		<Pallet<T>>::set_property_permission(70			self,71			&caller,72			PropertyKeyPermission {73				key: <Vec<u8>>::from(key)74					.try_into()75					.map_err(|_| "too long key")?,76				permission: PropertyPermission {77					mutable: is_mutable,78					collection_admin,79					token_owner,80				},81			},82		)83		.map_err(dispatch_to_evm::<T>)84	}8586	/// @notice Set token property value.87	/// @dev Throws error if `msg.sender` has no permission to edit the property.88	/// @param tokenId ID of the token.89	/// @param key Property key.90	/// @param value Property value.91	fn set_property(92		&mut self,93		caller: caller,94		token_id: uint256,95		key: string,96		value: bytes,97	) -> Result<()> {98		let caller = T::CrossAccountId::from_eth(caller);99		let token_id: u32 = token_id.try_into().map_err(|_| "token id overflow")?;100		let key = <Vec<u8>>::from(key)101			.try_into()102			.map_err(|_| "key too long")?;103		let value = value.try_into().map_err(|_| "value too long")?;104105		let nesting_budget = self106			.recorder107			.weight_calls_budget(<StructureWeight<T>>::find_parent());108109		<Pallet<T>>::set_token_property(110			self,111			&caller,112			TokenId(token_id),113			Property { key, value },114			&nesting_budget,115		)116		.map_err(dispatch_to_evm::<T>)117	}118119	/// @notice Delete token property value.120	/// @dev Throws error if `msg.sender` has no permission to edit the property.121	/// @param tokenId ID of the token.122	/// @param key Property key.123	fn delete_property(&mut self, token_id: uint256, caller: caller, key: string) -> Result<()> {124		let caller = T::CrossAccountId::from_eth(caller);125		let token_id: u32 = token_id.try_into().map_err(|_| "token id overflow")?;126		let key = <Vec<u8>>::from(key)127			.try_into()128			.map_err(|_| "key too long")?;129130		let nesting_budget = self131			.recorder132			.weight_calls_budget(<StructureWeight<T>>::find_parent());133134		<Pallet<T>>::delete_token_property(self, &caller, TokenId(token_id), key, &nesting_budget)135			.map_err(dispatch_to_evm::<T>)136	}137138	/// @notice Get token property value.139	/// @dev Throws error if key not found140	/// @param tokenId ID of the token.141	/// @param key Property key.142	/// @return Property value bytes143	fn property(&self, token_id: uint256, key: string) -> Result<bytes> {144		let token_id: u32 = token_id.try_into().map_err(|_| "token id overflow")?;145		let key = <Vec<u8>>::from(key)146			.try_into()147			.map_err(|_| "key too long")?;148149		let props = <TokenProperties<T>>::get((self.id, token_id));150		let prop = props.get(&key).ok_or("key not found")?;151152		Ok(prop.to_vec())153	}154}155156#[derive(ToLog)]157pub enum ERC721Events {158	/// @dev This emits when ownership of any NFT changes by any mechanism.159	///  This event emits when NFTs are created (`from` == 0) and destroyed160	///  (`to` == 0). Exception: during contract creation, any number of NFTs161	///  may be created and assigned without emitting Transfer. At the time of162	///  any transfer, the approved address for that NFT (if any) is reset to none.163	Transfer {164		#[indexed]165		from: address,166		#[indexed]167		to: address,168		#[indexed]169		token_id: uint256,170	},171	/// @dev This emits when the approved address for an NFT is changed or172	///  reaffirmed. The zero address indicates there is no approved address.173	///  When a Transfer event emits, this also indicates that the approved174	///  address for that NFT (if any) is reset to none.175	Approval {176		#[indexed]177		owner: address,178		#[indexed]179		approved: address,180		#[indexed]181		token_id: uint256,182	},183	/// @dev This emits when an operator is enabled or disabled for an owner.184	///  The operator can manage all NFTs of the owner.185	#[allow(dead_code)]186	ApprovalForAll {187		#[indexed]188		owner: address,189		#[indexed]190		operator: address,191		approved: bool,192	},193}194195#[derive(ToLog)]196pub enum ERC721MintableEvents {197	#[allow(dead_code)]198	MintingFinished {},199}200201/// @title ERC-721 Non-Fungible Token Standard, optional metadata extension202/// @dev See https://eips.ethereum.org/EIPS/eip-721203#[solidity_interface(name = ERC721Metadata, expect_selector = 0x5b5e139f)]204impl<T: Config> NonfungibleHandle<T> {205	/// @notice A descriptive name for a collection of NFTs in this contract206	fn name(&self) -> Result<string> {207		Ok(decode_utf16(self.name.iter().copied())208			.map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))209			.collect::<string>())210	}211212	/// @notice An abbreviated name for NFTs in this contract213	fn symbol(&self) -> Result<string> {214		Ok(string::from_utf8_lossy(&self.token_prefix).into())215	}216217	/// @notice A distinct Uniform Resource Identifier (URI) for a given asset.218	///219	/// @dev If the token has a `url` property and it is not empty, it is returned.220	///  Else If the collection does not have a property with key `schemaName` or its value is not equal to `ERC721Metadata`, it return an error `tokenURI not set`.221	///  If the collection property `baseURI` is empty or absent, return "" (empty string)222	///  otherwise, if token property `suffix` present and is non-empty, return concatenation of baseURI and suffix223	///  otherwise, return concatenation of `baseURI` and stringified token id (decimal stringifying, without paddings).224	///225	/// @return token's const_metadata226	#[solidity(rename_selector = "tokenURI")]227	fn token_uri(&self, token_id: uint256) -> Result<string> {228		if !self.supports_metadata() {229			return Ok("".into());230		}231232		let token_id_u32: u32 = token_id.try_into().map_err(|_| "token id overflow")?;233234		match get_token_property(self, token_id_u32, &key::url()).as_deref() {235			Err(_) | Ok("") => (),236			Ok(url) => {237				return Ok(url.into());238			}239		};240241		let base_uri =242			pallet_common::Pallet::<T>::get_collection_property(self.id, &key::base_uri())243				.map(BoundedVec::into_inner)244				.map(string::from_utf8)245				.transpose()246				.map_err(|e| {247					Error::Revert(alloc::format!(248						"Can not convert value \"baseURI\" to string with error \"{}\"",249						e250					))251				})?;252253		let base_uri = match base_uri.as_deref() {254			None | Some("") => {255				return Ok("".into());256			}257			Some(base_uri) => base_uri.into(),258		};259260		Ok(261			match get_token_property(self, token_id_u32, &key::suffix()).as_deref() {262				Err(_) | Ok("") => base_uri,263				Ok(suffix) => base_uri + suffix,264			},265		)266	}267}268269/// @title ERC-721 Non-Fungible Token Standard, optional enumeration extension270/// @dev See https://eips.ethereum.org/EIPS/eip-721271#[solidity_interface(name = ERC721Enumerable, expect_selector = 0x780e9d63)]272impl<T: Config> NonfungibleHandle<T> {273	/// @notice Enumerate valid NFTs274	/// @param index A counter less than `totalSupply()`275	/// @return The token identifier for the `index`th NFT,276	///  (sort order not specified)277	fn token_by_index(&self, index: uint256) -> Result<uint256> {278		Ok(index)279	}280281	/// @dev Not implemented282	fn token_of_owner_by_index(&self, _owner: address, _index: uint256) -> Result<uint256> {283		// TODO: Not implemetable284		Err("not implemented".into())285	}286287	/// @notice Count NFTs tracked by this contract288	/// @return A count of valid NFTs tracked by this contract, where each one of289	///  them has an assigned and queryable owner not equal to the zero address290	fn total_supply(&self) -> Result<uint256> {291		self.consume_store_reads(1)?;292		Ok(<Pallet<T>>::total_supply(self).into())293	}294}295296/// @title ERC-721 Non-Fungible Token Standard297/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md298#[solidity_interface(name = ERC721, events(ERC721Events), expect_selector = 0x80ac58cd)]299impl<T: Config> NonfungibleHandle<T> {300	/// @notice Count all NFTs assigned to an owner301	/// @dev NFTs assigned to the zero address are considered invalid, and this302	///  function throws for queries about the zero address.303	/// @param owner An address for whom to query the balance304	/// @return The number of NFTs owned by `owner`, possibly zero305	fn balance_of(&self, owner: address) -> Result<uint256> {306		self.consume_store_reads(1)?;307		let owner = T::CrossAccountId::from_eth(owner);308		let balance = <AccountBalance<T>>::get((self.id, owner));309		Ok(balance.into())310	}311	/// @notice Find the owner of an NFT312	/// @dev NFTs assigned to zero address are considered invalid, and queries313	///  about them do throw.314	/// @param tokenId The identifier for an NFT315	/// @return The address of the owner of the NFT316	fn owner_of(&self, token_id: uint256) -> Result<address> {317		self.consume_store_reads(1)?;318		let token: TokenId = token_id.try_into()?;319		Ok(*<TokenData<T>>::get((self.id, token))320			.ok_or("token not found")?321			.owner322			.as_eth())323	}324	/// @dev Not implemented325	#[solidity(rename_selector = "safeTransferFrom")]326	fn safe_transfer_from_with_data(327		&mut self,328		_from: address,329		_to: address,330		_token_id: uint256,331		_data: bytes,332	) -> Result<void> {333		// TODO: Not implemetable334		Err("not implemented".into())335	}336	/// @dev Not implemented337	fn safe_transfer_from(338		&mut self,339		_from: address,340		_to: address,341		_token_id: uint256,342	) -> Result<void> {343		// TODO: Not implemetable344		Err("not implemented".into())345	}346347	/// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE348	///  TO CONFIRM THAT `to` IS CAPABLE OF RECEIVING NFTS OR ELSE349	///  THEY MAY BE PERMANENTLY LOST350	/// @dev Throws unless `msg.sender` is the current owner or an authorized351	///  operator for this NFT. Throws if `from` is not the current owner. Throws352	///  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.353	/// @param from The current owner of the NFT354	/// @param to The new owner355	/// @param tokenId The NFT to transfer356	#[weight(<SelfWeightOf<T>>::transfer_from())]357	fn transfer_from(358		&mut self,359		caller: caller,360		from: address,361		to: address,362		token_id: uint256,363	) -> Result<void> {364		let caller = T::CrossAccountId::from_eth(caller);365		let from = T::CrossAccountId::from_eth(from);366		let to = T::CrossAccountId::from_eth(to);367		let token = token_id.try_into()?;368		let budget = self369			.recorder370			.weight_calls_budget(<StructureWeight<T>>::find_parent());371372		<Pallet<T>>::transfer_from(self, &caller, &from, &to, token, &budget)373			.map_err(dispatch_to_evm::<T>)?;374		Ok(())375	}376377	/// @notice Set or reaffirm the approved address for an NFT378	/// @dev The zero address indicates there is no approved address.379	/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized380	///  operator of the current owner.381	/// @param approved The new approved NFT controller382	/// @param tokenId The NFT to approve383	#[weight(<SelfWeightOf<T>>::approve())]384	fn approve(&mut self, caller: caller, approved: address, token_id: uint256) -> Result<void> {385		let caller = T::CrossAccountId::from_eth(caller);386		let approved = T::CrossAccountId::from_eth(approved);387		let token = token_id.try_into()?;388389		<Pallet<T>>::set_allowance(self, &caller, token, Some(&approved))390			.map_err(dispatch_to_evm::<T>)?;391		Ok(())392	}393394	/// @dev Not implemented395	fn set_approval_for_all(396		&mut self,397		_caller: caller,398		_operator: address,399		_approved: bool,400	) -> Result<void> {401		// TODO: Not implemetable402		Err("not implemented".into())403	}404405	/// @dev Not implemented406	fn get_approved(&self, _token_id: uint256) -> Result<address> {407		// TODO: Not implemetable408		Err("not implemented".into())409	}410411	/// @dev Not implemented412	fn is_approved_for_all(&self, _owner: address, _operator: address) -> Result<address> {413		// TODO: Not implemetable414		Err("not implemented".into())415	}416}417418/// @title ERC721 Token that can be irreversibly burned (destroyed).419#[solidity_interface(name = ERC721Burnable)]420impl<T: Config> NonfungibleHandle<T> {421	/// @notice Burns a specific ERC721 token.422	/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized423	///  operator of the current owner.424	/// @param tokenId The NFT to approve425	#[weight(<SelfWeightOf<T>>::burn_item())]426	fn burn(&mut self, caller: caller, token_id: uint256) -> Result<void> {427		let caller = T::CrossAccountId::from_eth(caller);428		let token = token_id.try_into()?;429430		<Pallet<T>>::burn(self, &caller, token).map_err(dispatch_to_evm::<T>)?;431		Ok(())432	}433}434435/// @title ERC721 minting logic.436#[solidity_interface(name = ERC721Mintable, events(ERC721MintableEvents))]437impl<T: Config> NonfungibleHandle<T> {438	fn minting_finished(&self) -> Result<bool> {439		Ok(false)440	}441442	/// @notice Function to mint token.443	/// @dev `tokenId` should be obtained with `nextTokenId` method,444	///  unlike standard, you can't specify it manually445	/// @param to The new owner446	/// @param tokenId ID of the minted NFT447	#[weight(<SelfWeightOf<T>>::create_item())]448	fn mint(&mut self, caller: caller, to: address, token_id: uint256) -> Result<bool> {449		let caller = T::CrossAccountId::from_eth(caller);450		let to = T::CrossAccountId::from_eth(to);451		let token_id: u32 = token_id.try_into()?;452		let budget = self453			.recorder454			.weight_calls_budget(<StructureWeight<T>>::find_parent());455456		if <TokensMinted<T>>::get(self.id)457			.checked_add(1)458			.ok_or("item id overflow")?459			!= token_id460		{461			return Err("item id should be next".into());462		}463464		<Pallet<T>>::create_item(465			self,466			&caller,467			CreateItemData::<T> {468				properties: BoundedVec::default(),469				owner: to,470			},471			&budget,472		)473		.map_err(dispatch_to_evm::<T>)?;474475		Ok(true)476	}477478	/// @notice Function to mint token with the given tokenUri.479	/// @dev `tokenId` should be obtained with `nextTokenId` method,480	///  unlike standard, you can't specify it manually481	/// @param to The new owner482	/// @param tokenId ID of the minted NFT483	/// @param tokenUri Token URI that would be stored in the NFT properties484	#[solidity(rename_selector = "mintWithTokenURI")]485	#[weight(<SelfWeightOf<T>>::create_item())]486	fn mint_with_token_uri(487		&mut self,488		caller: caller,489		to: address,490		token_id: uint256,491		token_uri: string,492	) -> Result<bool> {493		let key = key::url();494		let permission = get_token_permission::<T>(self.id, &key)?;495		if !permission.collection_admin {496			return Err("Operation is not allowed".into());497		}498499		let caller = T::CrossAccountId::from_eth(caller);500		let to = T::CrossAccountId::from_eth(to);501		let token_id: u32 = token_id.try_into().map_err(|_| "amount overflow")?;502		let budget = self503			.recorder504			.weight_calls_budget(<StructureWeight<T>>::find_parent());505506		if <TokensMinted<T>>::get(self.id)507			.checked_add(1)508			.ok_or("item id overflow")?509			!= token_id510		{511			return Err("item id should be next".into());512		}513514		let mut properties = CollectionPropertiesVec::default();515		properties516			.try_push(Property {517				key,518				value: token_uri519					.into_bytes()520					.try_into()521					.map_err(|_| "token uri is too long")?,522			})523			.map_err(|e| Error::Revert(alloc::format!("Can't add property: {:?}", e)))?;524525		<Pallet<T>>::create_item(526			self,527			&caller,528			CreateItemData::<T> {529				properties,530				owner: to,531			},532			&budget,533		)534		.map_err(dispatch_to_evm::<T>)?;535		Ok(true)536	}537538	/// @dev Not implemented539	fn finish_minting(&mut self, _caller: caller) -> Result<bool> {540		Err("not implementable".into())541	}542}543544fn get_token_property<T: Config>(545	collection: &CollectionHandle<T>,546	token_id: u32,547	key: &up_data_structs::PropertyKey,548) -> Result<string> {549	collection.consume_store_reads(1)?;550	let properties = <TokenProperties<T>>::try_get((collection.id, token_id))551		.map_err(|_| Error::Revert("Token properties not found".into()))?;552	if let Some(property) = properties.get(key) {553		return Ok(string::from_utf8_lossy(property).into());554	}555556	Err("Property tokenURI not found".into())557}558559fn get_token_permission<T: Config>(560	collection_id: CollectionId,561	key: &PropertyKey,562) -> Result<PropertyPermission> {563	let token_property_permissions = CollectionPropertyPermissions::<T>::try_get(collection_id)564		.map_err(|_| Error::Revert("No permissions for collection".into()))?;565	let a = token_property_permissions566		.get(key)567		.map(Clone::clone)568		.ok_or_else(|| {569			let key = string::from_utf8(key.clone().into_inner()).unwrap_or_default();570			Error::Revert(alloc::format!("No permission for key {}", key))571		})?;572	Ok(a)573}574575/// @title Unique extensions for ERC721.576#[solidity_interface(name = ERC721UniqueExtensions)]577impl<T: Config> NonfungibleHandle<T> {578	/// @notice Transfer ownership of an NFT579	/// @dev Throws unless `msg.sender` is the current owner. Throws if `to`580	///  is the zero address. Throws if `tokenId` is not a valid NFT.581	/// @param to The new owner582	/// @param tokenId The NFT to transfer583	#[weight(<SelfWeightOf<T>>::transfer())]584	fn transfer(&mut self, caller: caller, to: address, token_id: uint256) -> Result<void> {585		let caller = T::CrossAccountId::from_eth(caller);586		let to = T::CrossAccountId::from_eth(to);587		let token = token_id.try_into()?;588		let budget = self589			.recorder590			.weight_calls_budget(<StructureWeight<T>>::find_parent());591592		<Pallet<T>>::transfer(self, &caller, &to, token, &budget).map_err(dispatch_to_evm::<T>)?;593		Ok(())594	}595596	/// @notice Burns a specific ERC721 token.597	/// @dev Throws unless `msg.sender` is the current owner or an authorized598	///  operator for this NFT. Throws if `from` is not the current owner. Throws599	///  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.600	/// @param from The current owner of the NFT601	/// @param tokenId The NFT to transfer602	#[weight(<SelfWeightOf<T>>::burn_from())]603	fn burn_from(&mut self, caller: caller, from: address, token_id: uint256) -> Result<void> {604		let caller = T::CrossAccountId::from_eth(caller);605		let from = T::CrossAccountId::from_eth(from);606		let token = token_id.try_into()?;607		let budget = self608			.recorder609			.weight_calls_budget(<StructureWeight<T>>::find_parent());610611		<Pallet<T>>::burn_from(self, &caller, &from, token, &budget)612			.map_err(dispatch_to_evm::<T>)?;613		Ok(())614	}615616	/// @notice Returns next free NFT ID.617	fn next_token_id(&self) -> Result<uint256> {618		self.consume_store_reads(1)?;619		Ok(<TokensMinted<T>>::get(self.id)620			.checked_add(1)621			.ok_or("item id overflow")?622			.into())623	}624625	/// @notice Function to mint multiple tokens.626	/// @dev `tokenIds` should be an array of consecutive numbers and first number627	///  should be obtained with `nextTokenId` method628	/// @param to The new owner629	/// @param tokenIds IDs of the minted NFTs630	#[weight(<SelfWeightOf<T>>::create_multiple_items(token_ids.len() as u32))]631	fn mint_bulk(&mut self, caller: caller, to: address, token_ids: Vec<uint256>) -> Result<bool> {632		let caller = T::CrossAccountId::from_eth(caller);633		let to = T::CrossAccountId::from_eth(to);634		let mut expected_index = <TokensMinted<T>>::get(self.id)635			.checked_add(1)636			.ok_or("item id overflow")?;637		let budget = self638			.recorder639			.weight_calls_budget(<StructureWeight<T>>::find_parent());640641		let total_tokens = token_ids.len();642		for id in token_ids.into_iter() {643			let id: u32 = id.try_into().map_err(|_| "token id overflow")?;644			if id != expected_index {645				return Err("item id should be next".into());646			}647			expected_index = expected_index.checked_add(1).ok_or("item id overflow")?;648		}649		let data = (0..total_tokens)650			.map(|_| CreateItemData::<T> {651				properties: BoundedVec::default(),652				owner: to.clone(),653			})654			.collect();655656		<Pallet<T>>::create_multiple_items(self, &caller, data, &budget)657			.map_err(dispatch_to_evm::<T>)?;658		Ok(true)659	}660661	/// @notice Function to mint multiple tokens with the given tokenUris.662	/// @dev `tokenIds` is array of pairs of token ID and token URI. Token IDs should be consecutive663	///  numbers and first number should be obtained with `nextTokenId` method664	/// @param to The new owner665	/// @param tokens array of pairs of token ID and token URI for minted tokens666	#[solidity(rename_selector = "mintBulkWithTokenURI")]667	#[weight(<SelfWeightOf<T>>::create_multiple_items(tokens.len() as u32))]668	fn mint_bulk_with_token_uri(669		&mut self,670		caller: caller,671		to: address,672		tokens: Vec<(uint256, string)>,673	) -> Result<bool> {674		let key = key::url();675		let caller = T::CrossAccountId::from_eth(caller);676		let to = T::CrossAccountId::from_eth(to);677		let mut expected_index = <TokensMinted<T>>::get(self.id)678			.checked_add(1)679			.ok_or("item id overflow")?;680		let budget = self681			.recorder682			.weight_calls_budget(<StructureWeight<T>>::find_parent());683684		let mut data = Vec::with_capacity(tokens.len());685		for (id, token_uri) in tokens {686			let id: u32 = id.try_into().map_err(|_| "token id overflow")?;687			if id != expected_index {688				return Err("item id should be next".into());689			}690			expected_index = expected_index.checked_add(1).ok_or("item id overflow")?;691692			let mut properties = CollectionPropertiesVec::default();693			properties694				.try_push(Property {695					key: key.clone(),696					value: token_uri697						.into_bytes()698						.try_into()699						.map_err(|_| "token uri is too long")?,700				})701				.map_err(|e| Error::Revert(alloc::format!("Can't add property: {:?}", e)))?;702703			data.push(CreateItemData::<T> {704				properties,705				owner: to.clone(),706			});707		}708709		<Pallet<T>>::create_multiple_items(self, &caller, data, &budget)710			.map_err(dispatch_to_evm::<T>)?;711		Ok(true)712	}713}714715impl<T: Config> NonfungibleHandle<T> {716	pub fn supports_metadata(&self) -> bool {717		if let Some(erc721_metadata) =718			pallet_common::Pallet::<T>::get_collection_property(self.id, &key::erc721_metadata())719		{720			*erc721_metadata.into_inner() == *value::ERC721_METADATA_SUPPORTED721		} else {722			false723		}724	}725}726727#[solidity_interface(728	name = UniqueNFT,729	is(730		ERC721,731		ERC721Enumerable,732		ERC721UniqueExtensions,733		ERC721Mintable,734		ERC721Burnable,735		Collection(via(common_mut returns CollectionHandle<T>)),736		TokenProperties,737		ERC721Metadata(if(this.supports_metadata())),738	)739)]740impl<T: Config> NonfungibleHandle<T> where T::AccountId: From<[u8; 32]> + AsRef<[u8; 32]> {}741742// Not a tests, but code generators743generate_stubgen!(gen_impl, UniqueNFTCall<()>, true);744generate_stubgen!(gen_iface, UniqueNFTCall<()>, false);745746impl<T: Config> CommonEvmHandler for NonfungibleHandle<T>747where748	T::AccountId: From<[u8; 32]> + AsRef<[u8; 32]>,749{750	const CODE: &'static [u8] = include_bytes!("./stubs/UniqueNFT.raw");751752	fn call(self, handle: &mut impl PrecompileHandle) -> Option<PrecompileResult> {753		call::<T, UniqueNFTCall<T>, _, _>(handle, self)754	}755}