git.delta.rocks / unique-network / refs/commits / bc7b16cd8b49

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::{CommonEvmHandler, PrecompileResult, CollectionCall, static_property_key_value::*},37	CollectionHandle, CollectionPropertyPermissions,38};39use pallet_evm::{account::CrossAccountId, PrecompileHandle};40use pallet_evm_coder_substrate::call;41use pallet_structure::{SelfWeightOf as StructureWeight, weights::WeightInfo as _};42use alloc::string::ToString;4344use crate::{45	AccountBalance, Config, CreateItemData, NonfungibleHandle, Pallet, TokenData, TokensMinted,46	SelfWeightOf, weights::WeightInfo, TokenProperties,47};4849/// @title A contract that allows to set and delete token properties and change token property permissions.50#[solidity_interface(name = "TokenProperties")]51impl<T: Config> NonfungibleHandle<T> {52	/// @notice Set permissions for token property.53	/// @dev Throws error if `msg.sender` is not admin or owner of the collection.54	/// @param key Property key.55	/// @param is_mutable Permission to mutate property.56	/// @param collection_admin Permission to mutate property by collection admin if property is mutable.57	/// @param token_owner Permission to mutate property by token owner if property is mutable.58	fn set_token_property_permission(59		&mut self,60		caller: caller,61		key: string,62		is_mutable: bool,63		collection_admin: bool,64		token_owner: bool,65	) -> Result<()> {66		let caller = T::CrossAccountId::from_eth(caller);67		<Pallet<T>>::set_property_permission(68			self,69			&caller,70			PropertyKeyPermission {71				key: <Vec<u8>>::from(key)72					.try_into()73					.map_err(|_| "too long key")?,74				permission: PropertyPermission {75					mutable: is_mutable,76					collection_admin,77					token_owner,78				},79			},80		)81		.map_err(dispatch_to_evm::<T>)82	}8384	/// @notice Set token property value.85	/// @dev Throws error if `msg.sender` has no permission to edit the property.86	/// @param tokenId ID of the token.87	/// @param key Property key.88	/// @param value Property value.89	fn set_property(90		&mut self,91		caller: caller,92		token_id: uint256,93		key: string,94		value: bytes,95	) -> Result<()> {96		let caller = T::CrossAccountId::from_eth(caller);97		let token_id: u32 = token_id.try_into().map_err(|_| "token id overflow")?;98		let key = <Vec<u8>>::from(key)99			.try_into()100			.map_err(|_| "key too long")?;101		let value = value.try_into().map_err(|_| "value too long")?;102103		let nesting_budget = self104			.recorder105			.weight_calls_budget(<StructureWeight<T>>::find_parent());106107		<Pallet<T>>::set_token_property(108			self,109			&caller,110			TokenId(token_id),111			Property { key, value },112			&nesting_budget,113		)114		.map_err(dispatch_to_evm::<T>)115	}116117	/// @notice Delete token property value.118	/// @dev Throws error if `msg.sender` has no permission to edit the property.119	/// @param tokenId ID of the token.120	/// @param key Property key.121	fn delete_property(&mut self, token_id: uint256, caller: caller, key: string) -> Result<()> {122		let caller = T::CrossAccountId::from_eth(caller);123		let token_id: u32 = token_id.try_into().map_err(|_| "token id overflow")?;124		let key = <Vec<u8>>::from(key)125			.try_into()126			.map_err(|_| "key too long")?;127128		let nesting_budget = self129			.recorder130			.weight_calls_budget(<StructureWeight<T>>::find_parent());131132		<Pallet<T>>::delete_token_property(self, &caller, TokenId(token_id), key, &nesting_budget)133			.map_err(dispatch_to_evm::<T>)134	}135136	/// @notice Get token property value.137	/// @dev Throws error if key not found138	/// @param tokenId ID of the token.139	/// @param key Property key.140	/// @return Property value bytes141	fn property(&self, token_id: uint256, key: string) -> Result<bytes> {142		let token_id: u32 = token_id.try_into().map_err(|_| "token id overflow")?;143		let key = <Vec<u8>>::from(key)144			.try_into()145			.map_err(|_| "key too long")?;146147		let props = <TokenProperties<T>>::get((self.id, token_id));148		let prop = props.get(&key).ok_or("key not found")?;149150		Ok(prop.to_vec())151	}152}153154#[derive(ToLog)]155pub enum ERC721Events {156	/// @dev This emits when ownership of any NFT changes by any mechanism.157	///  This event emits when NFTs are created (`from` == 0) and destroyed158	///  (`to` == 0). Exception: during contract creation, any number of NFTs159	///  may be created and assigned without emitting Transfer. At the time of160	///  any transfer, the approved address for that NFT (if any) is reset to none.161	Transfer {162		#[indexed]163		from: address,164		#[indexed]165		to: address,166		#[indexed]167		token_id: uint256,168	},169	/// @dev This emits when the approved address for an NFT is changed or170	///  reaffirmed. The zero address indicates there is no approved address.171	///  When a Transfer event emits, this also indicates that the approved172	///  address for that NFT (if any) is reset to none.173	Approval {174		#[indexed]175		owner: address,176		#[indexed]177		approved: address,178		#[indexed]179		token_id: uint256,180	},181	/// @dev This emits when an operator is enabled or disabled for an owner.182	///  The operator can manage all NFTs of the owner.183	#[allow(dead_code)]184	ApprovalForAll {185		#[indexed]186		owner: address,187		#[indexed]188		operator: address,189		approved: bool,190	},191}192193#[derive(ToLog)]194pub enum ERC721MintableEvents {195	#[allow(dead_code)]196	MintingFinished {},197}198199/// @title ERC-721 Non-Fungible Token Standard, optional metadata extension200/// @dev See https://eips.ethereum.org/EIPS/eip-721201#[solidity_interface(name = "ERC721Metadata")]202impl<T: Config> NonfungibleHandle<T> {203	/// @notice A descriptive name for a collection of NFTs in this contract204	fn name(&self) -> Result<string> {205		Ok(decode_utf16(self.name.iter().copied())206			.map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))207			.collect::<string>())208	}209210	/// @notice An abbreviated name for NFTs in this contract211	fn symbol(&self) -> Result<string> {212		Ok(string::from_utf8_lossy(&self.token_prefix).into())213	}214215	/// @notice A distinct Uniform Resource Identifier (URI) for a given asset.216	/// @dev Throws if `tokenId` is not a valid NFT. URIs are defined in RFC217	///  3986. The URI may point to a JSON file that conforms to the "ERC721218	///  Metadata JSON Schema".219	/// @return token's const_metadata220	#[solidity(rename_selector = "tokenURI")]221	fn token_uri(&self, token_id: uint256) -> Result<string> {222		let is_erc721 = || {223			if let Some(shema_name) =224				pallet_common::Pallet::<T>::get_collection_property(self.id, &schema_name_key())225			{226				let shema_name = shema_name.into_inner();227				shema_name == ERC721_METADATA228			} else {229				false230			}231		};232233		let token_id_u32: u32 = token_id.try_into().map_err(|_| "token id overflow")?;234235		if let Ok(url) = get_token_property(self, token_id_u32, &url_key()) {236			if !url.is_empty() {237				return Ok(url);238			}239		} else if !is_erc721() {240			return Err("tokenURI not set".into());241		}242243		if let Some(base_uri) =244			pallet_common::Pallet::<T>::get_collection_property(self.id, &base_uri_key())245		{246			if !base_uri.is_empty() {247				let base_uri = string::from_utf8(base_uri.into_inner()).map_err(|e| {248					Error::Revert(alloc::format!(249						"Can not convert value \"baseURI\" to string with error \"{}\"",250						e251					))252				})?;253				if let Ok(suffix) = get_token_property(self, token_id_u32, &suffix_key()) {254					if !suffix.is_empty() {255						return Ok(base_uri + suffix.as_str());256					}257				}258259				return Ok(base_uri + token_id.to_string().as_str());260			}261		}262263		Ok("".into())264	}265}266267/// @title ERC-721 Non-Fungible Token Standard, optional enumeration extension268/// @dev See https://eips.ethereum.org/EIPS/eip-721269#[solidity_interface(name = "ERC721Enumerable")]270impl<T: Config> NonfungibleHandle<T> {271	/// @notice Enumerate valid NFTs272	/// @param index A counter less than `totalSupply()`273	/// @return The token identifier for the `index`th NFT,274	///  (sort order not specified)275	fn token_by_index(&self, index: uint256) -> Result<uint256> {276		Ok(index)277	}278279	/// @dev Not implemented280	fn token_of_owner_by_index(&self, _owner: address, _index: uint256) -> Result<uint256> {281		// TODO: Not implemetable282		Err("not implemented".into())283	}284285	/// @notice Count NFTs tracked by this contract286	/// @return A count of valid NFTs tracked by this contract, where each one of287	///  them has an assigned and queryable owner not equal to the zero address288	fn total_supply(&self) -> Result<uint256> {289		self.consume_store_reads(1)?;290		Ok(<Pallet<T>>::total_supply(self).into())291	}292}293294/// @title ERC-721 Non-Fungible Token Standard295/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md296#[solidity_interface(name = "ERC721", events(ERC721Events))]297impl<T: Config> NonfungibleHandle<T> {298	/// @notice Count all NFTs assigned to an owner299	/// @dev NFTs assigned to the zero address are considered invalid, and this300	///  function throws for queries about the zero address.301	/// @param owner An address for whom to query the balance302	/// @return The number of NFTs owned by `owner`, possibly zero303	fn balance_of(&self, owner: address) -> Result<uint256> {304		self.consume_store_reads(1)?;305		let owner = T::CrossAccountId::from_eth(owner);306		let balance = <AccountBalance<T>>::get((self.id, owner));307		Ok(balance.into())308	}309	/// @notice Find the owner of an NFT310	/// @dev NFTs assigned to zero address are considered invalid, and queries311	///  about them do throw.312	/// @param tokenId The identifier for an NFT313	/// @return The address of the owner of the NFT314	fn owner_of(&self, token_id: uint256) -> Result<address> {315		self.consume_store_reads(1)?;316		let token: TokenId = token_id.try_into()?;317		Ok(*<TokenData<T>>::get((self.id, token))318			.ok_or("token not found")?319			.owner320			.as_eth())321	}322	/// @dev Not implemented323	fn safe_transfer_from_with_data(324		&mut self,325		_from: address,326		_to: address,327		_token_id: uint256,328		_data: bytes,329		_value: value,330	) -> Result<void> {331		// TODO: Not implemetable332		Err("not implemented".into())333	}334	/// @dev Not implemented335	fn safe_transfer_from(336		&mut self,337		_from: address,338		_to: address,339		_token_id: uint256,340		_value: value,341	) -> Result<void> {342		// TODO: Not implemetable343		Err("not implemented".into())344	}345346	/// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE347	///  TO CONFIRM THAT `to` IS CAPABLE OF RECEIVING NFTS OR ELSE348	///  THEY MAY BE PERMANENTLY LOST349	/// @dev Throws unless `msg.sender` is the current owner or an authorized350	///  operator for this NFT. Throws if `from` is not the current owner. Throws351	///  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.352	/// @param from The current owner of the NFT353	/// @param to The new owner354	/// @param tokenId The NFT to transfer355	/// @param _value Not used for an NFT356	#[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		_value: value,364	) -> Result<void> {365		let caller = T::CrossAccountId::from_eth(caller);366		let from = T::CrossAccountId::from_eth(from);367		let to = T::CrossAccountId::from_eth(to);368		let token = token_id.try_into()?;369		let budget = self370			.recorder371			.weight_calls_budget(<StructureWeight<T>>::find_parent());372373		<Pallet<T>>::transfer_from(self, &caller, &from, &to, token, &budget)374			.map_err(dispatch_to_evm::<T>)?;375		Ok(())376	}377378	/// @notice Set or reaffirm the approved address for an NFT379	/// @dev The zero address indicates there is no approved address.380	/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized381	///  operator of the current owner.382	/// @param approved The new approved NFT controller383	/// @param tokenId The NFT to approve384	#[weight(<SelfWeightOf<T>>::approve())]385	fn approve(386		&mut self,387		caller: caller,388		approved: address,389		token_id: uint256,390		_value: value,391	) -> Result<void> {392		let caller = T::CrossAccountId::from_eth(caller);393		let approved = T::CrossAccountId::from_eth(approved);394		let token = token_id.try_into()?;395396		<Pallet<T>>::set_allowance(self, &caller, token, Some(&approved))397			.map_err(dispatch_to_evm::<T>)?;398		Ok(())399	}400401	/// @dev Not implemented402	fn set_approval_for_all(403		&mut self,404		_caller: caller,405		_operator: address,406		_approved: bool,407	) -> Result<void> {408		// TODO: Not implemetable409		Err("not implemented".into())410	}411412	/// @dev Not implemented413	fn get_approved(&self, _token_id: uint256) -> Result<address> {414		// TODO: Not implemetable415		Err("not implemented".into())416	}417418	/// @dev Not implemented419	fn is_approved_for_all(&self, _owner: address, _operator: address) -> Result<address> {420		// TODO: Not implemetable421		Err("not implemented".into())422	}423}424425/// @title ERC721 Token that can be irreversibly burned (destroyed).426#[solidity_interface(name = "ERC721Burnable")]427impl<T: Config> NonfungibleHandle<T> {428	/// @notice Burns a specific ERC721 token.429	/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized430	///  operator of the current owner.431	/// @param tokenId The NFT to approve432	#[weight(<SelfWeightOf<T>>::burn_item())]433	fn burn(&mut self, caller: caller, token_id: uint256) -> Result<void> {434		let caller = T::CrossAccountId::from_eth(caller);435		let token = token_id.try_into()?;436437		<Pallet<T>>::burn(self, &caller, token).map_err(dispatch_to_evm::<T>)?;438		Ok(())439	}440}441442/// @title ERC721 minting logic.443#[solidity_interface(name = "ERC721Mintable", events(ERC721MintableEvents))]444impl<T: Config> NonfungibleHandle<T> {445	fn minting_finished(&self) -> Result<bool> {446		Ok(false)447	}448449	/// @notice Function to mint token.450	/// @dev `tokenId` should be obtained with `nextTokenId` method,451	///  unlike standard, you can't specify it manually452	/// @param to The new owner453	/// @param tokenId ID of the minted NFT454	#[weight(<SelfWeightOf<T>>::create_item())]455	fn mint(&mut self, caller: caller, to: address, token_id: uint256) -> Result<bool> {456		let caller = T::CrossAccountId::from_eth(caller);457		let to = T::CrossAccountId::from_eth(to);458		let token_id: u32 = token_id.try_into()?;459		let budget = self460			.recorder461			.weight_calls_budget(<StructureWeight<T>>::find_parent());462463		if <TokensMinted<T>>::get(self.id)464			.checked_add(1)465			.ok_or("item id overflow")?466			!= token_id467		{468			return Err("item id should be next".into());469		}470471		<Pallet<T>>::create_item(472			self,473			&caller,474			CreateItemData::<T> {475				properties: BoundedVec::default(),476				owner: to,477			},478			&budget,479		)480		.map_err(dispatch_to_evm::<T>)?;481482		Ok(true)483	}484485	/// @notice Function to mint token with the given tokenUri.486	/// @dev `tokenId` should be obtained with `nextTokenId` method,487	///  unlike standard, you can't specify it manually488	/// @param to The new owner489	/// @param tokenId ID of the minted NFT490	/// @param tokenUri Token URI that would be stored in the NFT properties491	#[solidity(rename_selector = "mintWithTokenURI")]492	#[weight(<SelfWeightOf<T>>::create_item())]493	fn mint_with_token_uri(494		&mut self,495		caller: caller,496		to: address,497		token_id: uint256,498		token_uri: string,499	) -> Result<bool> {500		let key = url_key();501		let permission = get_token_permission::<T>(self.id, &key)?;502		if !permission.collection_admin {503			return Err("Operation is not allowed".into());504		}505506		let caller = T::CrossAccountId::from_eth(caller);507		let to = T::CrossAccountId::from_eth(to);508		let token_id: u32 = token_id.try_into().map_err(|_| "amount overflow")?;509		let budget = self510			.recorder511			.weight_calls_budget(<StructureWeight<T>>::find_parent());512513		if <TokensMinted<T>>::get(self.id)514			.checked_add(1)515			.ok_or("item id overflow")?516			!= token_id517		{518			return Err("item id should be next".into());519		}520521		let mut properties = CollectionPropertiesVec::default();522		properties523			.try_push(Property {524				key,525				value: token_uri526					.into_bytes()527					.try_into()528					.map_err(|_| "token uri is too long")?,529			})530			.map_err(|e| Error::Revert(alloc::format!("Can't add property: {:?}", e)))?;531532		<Pallet<T>>::create_item(533			self,534			&caller,535			CreateItemData::<T> {536				properties,537				owner: to,538			},539			&budget,540		)541		.map_err(dispatch_to_evm::<T>)?;542		Ok(true)543	}544545	/// @dev Not implemented546	fn finish_minting(&mut self, _caller: caller) -> Result<bool> {547		Err("not implementable".into())548	}549}550551fn get_token_property<T: Config>(552	collection: &CollectionHandle<T>,553	token_id: u32,554	key: &up_data_structs::PropertyKey,555) -> Result<string> {556	collection.consume_store_reads(1)?;557	let properties = <TokenProperties<T>>::try_get((collection.id, token_id))558		.map_err(|_| Error::Revert("Token properties not found".into()))?;559	if let Some(property) = properties.get(key) {560		return Ok(string::from_utf8_lossy(property).into());561	}562563	Err("Property tokenURI not found".into())564}565566fn get_token_permission<T: Config>(567	collection_id: CollectionId,568	key: &PropertyKey,569) -> Result<PropertyPermission> {570	let token_property_permissions = CollectionPropertyPermissions::<T>::try_get(collection_id)571		.map_err(|_| Error::Revert("No permissions for collection".into()))?;572	let a = token_property_permissions573		.get(key)574		.map(Clone::clone)575		.ok_or_else(|| {576			let key = string::from_utf8(key.clone().into_inner()).unwrap_or_default();577			Error::Revert(alloc::format!("No permission for key {}", key))578		})?;579	Ok(a)580}581582fn has_token_permission<T: Config>(collection_id: CollectionId, key: &PropertyKey) -> bool {583	if let Ok(token_property_permissions) =584		CollectionPropertyPermissions::<T>::try_get(collection_id)585	{586		return token_property_permissions.contains_key(key);587	}588589	false590}591592/// @title Unique extensions for ERC721.593#[solidity_interface(name = "ERC721UniqueExtensions")]594impl<T: Config> NonfungibleHandle<T> {595	/// @notice Transfer ownership of an NFT596	/// @dev Throws unless `msg.sender` is the current owner. Throws if `to`597	///  is the zero address. Throws if `tokenId` is not a valid NFT.598	/// @param to The new owner599	/// @param tokenId The NFT to transfer600	/// @param _value Not used for an NFT601	#[weight(<SelfWeightOf<T>>::transfer())]602	fn transfer(603		&mut self,604		caller: caller,605		to: address,606		token_id: uint256,607		_value: value,608	) -> Result<void> {609		let caller = T::CrossAccountId::from_eth(caller);610		let to = T::CrossAccountId::from_eth(to);611		let token = token_id.try_into()?;612		let budget = self613			.recorder614			.weight_calls_budget(<StructureWeight<T>>::find_parent());615616		<Pallet<T>>::transfer(self, &caller, &to, token, &budget).map_err(dispatch_to_evm::<T>)?;617		Ok(())618	}619620	/// @notice Burns a specific ERC721 token.621	/// @dev Throws unless `msg.sender` is the current owner or an authorized622	///  operator for this NFT. Throws if `from` is not the current owner. Throws623	///  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.624	/// @param from The current owner of the NFT625	/// @param tokenId The NFT to transfer626	/// @param _value Not used for an NFT627	#[weight(<SelfWeightOf<T>>::burn_from())]628	fn burn_from(629		&mut self,630		caller: caller,631		from: address,632		token_id: uint256,633		_value: value,634	) -> Result<void> {635		let caller = T::CrossAccountId::from_eth(caller);636		let from = T::CrossAccountId::from_eth(from);637		let token = token_id.try_into()?;638		let budget = self639			.recorder640			.weight_calls_budget(<StructureWeight<T>>::find_parent());641642		<Pallet<T>>::burn_from(self, &caller, &from, token, &budget)643			.map_err(dispatch_to_evm::<T>)?;644		Ok(())645	}646647	/// @notice Returns next free NFT ID.648	fn next_token_id(&self) -> Result<uint256> {649		self.consume_store_reads(1)?;650		Ok(<TokensMinted<T>>::get(self.id)651			.checked_add(1)652			.ok_or("item id overflow")?653			.into())654	}655656	/// @notice Function to mint multiple tokens.657	/// @dev `tokenIds` should be an array of consecutive numbers and first number658	///  should be obtained with `nextTokenId` method659	/// @param to The new owner660	/// @param tokenIds IDs of the minted NFTs661	#[weight(<SelfWeightOf<T>>::create_multiple_items(token_ids.len() as u32))]662	fn mint_bulk(&mut self, caller: caller, to: address, token_ids: Vec<uint256>) -> Result<bool> {663		let caller = T::CrossAccountId::from_eth(caller);664		let to = T::CrossAccountId::from_eth(to);665		let mut expected_index = <TokensMinted<T>>::get(self.id)666			.checked_add(1)667			.ok_or("item id overflow")?;668		let budget = self669			.recorder670			.weight_calls_budget(<StructureWeight<T>>::find_parent());671672		let total_tokens = token_ids.len();673		for id in token_ids.into_iter() {674			let id: u32 = id.try_into().map_err(|_| "token id overflow")?;675			if id != expected_index {676				return Err("item id should be next".into());677			}678			expected_index = expected_index.checked_add(1).ok_or("item id overflow")?;679		}680		let data = (0..total_tokens)681			.map(|_| CreateItemData::<T> {682				properties: BoundedVec::default(),683				owner: to.clone(),684			})685			.collect();686687		<Pallet<T>>::create_multiple_items(self, &caller, data, &budget)688			.map_err(dispatch_to_evm::<T>)?;689		Ok(true)690	}691692	/// @notice Function to mint multiple tokens with the given tokenUris.693	/// @dev `tokenIds` is array of pairs of token ID and token URI. Token IDs should be consecutive694	///  numbers and first number should be obtained with `nextTokenId` method695	/// @param to The new owner696	/// @param tokens array of pairs of token ID and token URI for minted tokens697	#[solidity(rename_selector = "mintBulkWithTokenURI")]698	#[weight(<SelfWeightOf<T>>::create_multiple_items(tokens.len() as u32))]699	fn mint_bulk_with_token_uri(700		&mut self,701		caller: caller,702		to: address,703		tokens: Vec<(uint256, string)>,704	) -> Result<bool> {705		let key = url_key();706		let caller = T::CrossAccountId::from_eth(caller);707		let to = T::CrossAccountId::from_eth(to);708		let mut expected_index = <TokensMinted<T>>::get(self.id)709			.checked_add(1)710			.ok_or("item id overflow")?;711		let budget = self712			.recorder713			.weight_calls_budget(<StructureWeight<T>>::find_parent());714715		let mut data = Vec::with_capacity(tokens.len());716		for (id, token_uri) in tokens {717			let id: u32 = id.try_into().map_err(|_| "token id overflow")?;718			if id != expected_index {719				return Err("item id should be next".into());720			}721			expected_index = expected_index.checked_add(1).ok_or("item id overflow")?;722723			let mut properties = CollectionPropertiesVec::default();724			properties725				.try_push(Property {726					key: key.clone(),727					value: token_uri728						.into_bytes()729						.try_into()730						.map_err(|_| "token uri is too long")?,731				})732				.map_err(|e| Error::Revert(alloc::format!("Can't add property: {:?}", e)))?;733734			data.push(CreateItemData::<T> {735				properties,736				owner: to.clone(),737			});738		}739740		<Pallet<T>>::create_multiple_items(self, &caller, data, &budget)741			.map_err(dispatch_to_evm::<T>)?;742		Ok(true)743	}744}745746#[solidity_interface(747	name = "UniqueNFT",748	is(749		ERC721,750		ERC721Metadata,751		ERC721Enumerable,752		ERC721UniqueExtensions,753		ERC721Mintable,754		ERC721Burnable,755		via("CollectionHandle<T>", common_mut, Collection),756		TokenProperties,757	)758)]759impl<T: Config> NonfungibleHandle<T> where T::AccountId: From<[u8; 32]> {}760761// Not a tests, but code generators762generate_stubgen!(gen_impl, UniqueNFTCall<()>, true);763generate_stubgen!(gen_iface, UniqueNFTCall<()>, false);764765impl<T: Config> CommonEvmHandler for NonfungibleHandle<T>766where767	T::AccountId: From<[u8; 32]>,768{769	const CODE: &'static [u8] = include_bytes!("./stubs/UniqueNFT.raw");770771	fn call(self, handle: &mut impl PrecompileHandle) -> Option<PrecompileResult> {772		call::<T, UniqueNFTCall<T>, _, _>(handle, self)773	}774}