git.delta.rocks / unique-network / refs/commits / 4efe3bf847ba

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 Pallet18//!19//! The Nonfungible pallet provides functionality for handling nonfungible collections and tokens.20//!21//! - [`Config`]22//! - [`NonfungibleHandle`]23//! - [`Pallet`]24//! - [`CommonWeights`](common::CommonWeights)25//!26//! ## Overview27//!28//! The Nonfungible pallet provides functions for:29//!30//! - NFT collection creation and removal31//! - Minting and burning of NFT tokens32//! - Retrieving account balances33//! - Transfering NFT tokens34//! - Setting and checking allowance for NFT tokens35//! - Setting properties and permissions for NFT collections and tokens36//! - Nesting and unnesting tokens37//!38//! ### Terminology39//!40//! - **NFT token:** Non fungible token.41//!42//! - **NFT Collection:** A collection of NFT tokens. All NFT tokens are part of a collection.43//!   Each collection can define it's own properties, properties for it's tokens and set of permissions.44//!45//! - **Balance:** Number of NFT tokens owned by an account46//!47//! - **Allowance:** NFT tokens owned by one account that another account is allowed to make operations on48//!49//! - **Burning:** The process of “deleting” a token from a collection and from50//!   an account balance of the owner.51//!52//! - **Nesting:** Setting up parent-child relationship between tokens. Nested tokens are inhereting53//!   owner from their parent. There could be multiple levels of nesting. Token couldn't be nested in54//!   it's child token i.e. parent-child relationship graph shouldn't have cycles.55//!56//! - **Properties:** Key-Values pairs. Token properties are attached to a token. Collection properties are57//!   attached to a collection. Set of permissions could be defined for each property.58//!59//! ### Implementations60//!61//! The Nonfungible pallet provides implementations for the following traits. If these traits provide62//! the functionality that you need, then you can avoid coupling with the Nonfungible pallet.63//!64//! - [`CommonWeightInfo`](pallet_common::CommonWeightInfo): Functions for retrieval of transaction weight65//! - [`CommonCollectionOperations`](pallet_common::CommonCollectionOperations): Functions for dealing66//!   with collections67//!68//! ## Interface69//!70//! ### Dispatchable Functions71//!72//! - `init_collection` - Create NFT collection. NFT collection can be configured to allow or deny access for73//!   some accounts.74//! - `destroy_collection` - Destroy exising NFT collection. There should be no tokens in the collection.75//! - `burn` - Burn NFT token owned by account.76//! - `transfer` - Transfer NFT token. Transfers should be enabled for NFT collection.77//!   Nests the NFT token if it is sent to another token.78//! - `create_item` - Mint NFT token in collection. Sender should have permission to mint tokens.79//! - `set_allowance` - Set allowance for another account.80//! - `set_token_property` - Set token property value.81//! - `delete_token_property` - Remove property from the token.82//! - `set_collection_properties` - Set collection properties.83//! - `delete_collection_properties` - Remove properties from the collection.84//! - `set_property_permission` - Set collection property permission.85//! - `set_token_property_permissions` - Set token property permissions.86//!87//! ## Assumptions88//!89//! * To perform operations on tokens sender should be in collection's allow list if collection access mode is `AllowList`.9091#![cfg_attr(not(feature = "std"), no_std)]9293use erc::ERC721Events;94use evm_coder::ToLog;95use frame_support::{96	BoundedVec, ensure, fail, transactional,97	storage::with_transaction,98	pallet_prelude::DispatchResultWithPostInfo,99	pallet_prelude::Weight,100	dispatch::{PostDispatchInfo, Pays},101};102use up_data_structs::{103	AccessMode, CollectionId, CollectionFlags, CustomDataLimit, TokenId, CreateCollectionData,104	CreateNftExData, mapping::TokenAddressMapping, budget::Budget, Property, PropertyKey,105	PropertyValue, PropertyKeyPermission, PropertyScope, TrySetProperty, TokenChild,106	AuxPropertyValue, PropertiesPermissionMap, TokenProperties as TokenPropertiesT,107};108use pallet_evm::{account::CrossAccountId, Pallet as PalletEvm};109use pallet_common::{110	Error as CommonError, Pallet as PalletCommon, Event as CommonEvent, CollectionHandle,111	eth::collection_id_to_address, SelfWeightOf as PalletCommonWeightOf,112	weights::WeightInfo as CommonWeightInfo, helpers::add_weight_to_post_info,113};114use pallet_structure::{Pallet as PalletStructure, Error as StructureError};115use pallet_evm_coder_substrate::{SubstrateRecorder, WithRecorder};116use sp_core::{Get, H160};117use sp_runtime::{ArithmeticError, DispatchError, DispatchResult, TransactionOutcome};118use sp_std::{vec::Vec, vec, collections::btree_map::BTreeMap};119use core::ops::Deref;120use codec::{Encode, Decode, MaxEncodedLen};121use scale_info::TypeInfo;122123pub use pallet::*;124use weights::WeightInfo;125#[cfg(feature = "runtime-benchmarks")]126pub mod benchmarking;127pub mod common;128pub mod erc;129pub mod weights;130131pub type CreateItemData<T> = CreateNftExData<<T as pallet_evm::Config>::CrossAccountId>;132pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;133134/// Token data, stored independently from other data used to describe it135/// for the convenience of database access. Notably contains the owner account address.136#[struct_versioning::versioned(version = 2, upper)]137#[derive(Encode, Decode, TypeInfo, MaxEncodedLen)]138pub struct ItemData<CrossAccountId> {139	#[version(..2)]140	pub const_data: BoundedVec<u8, CustomDataLimit>,141142	#[version(..2)]143	pub variable_data: BoundedVec<u8, CustomDataLimit>,144145	pub owner: CrossAccountId,146}147148#[frame_support::pallet]149pub mod pallet {150	use super::*;151	use frame_support::{152		Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key, traits::StorageVersion,153	};154	use frame_system::pallet_prelude::*;155	use up_data_structs::{CollectionId, TokenId};156	use super::weights::WeightInfo;157158	#[pallet::error]159	pub enum Error<T> {160		/// Not Nonfungible item data used to mint in Nonfungible collection.161		NotNonfungibleDataUsedToMintFungibleCollectionToken,162		/// Used amount > 1 with NFT163		NonfungibleItemsHaveNoAmount,164		/// Unable to burn NFT with children165		CantBurnNftWithChildren,166	}167168	#[pallet::config]169	pub trait Config:170		frame_system::Config + pallet_common::Config + pallet_structure::Config + pallet_evm::Config171	{172		type WeightInfo: WeightInfo;173	}174175	const STORAGE_VERSION: StorageVersion = StorageVersion::new(1);176177	#[pallet::pallet]178	#[pallet::storage_version(STORAGE_VERSION)]179	pub struct Pallet<T>(_);180181	/// Total amount of minted tokens in a collection.182	#[pallet::storage]183	pub type TokensMinted<T: Config> =184		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;185186	/// Amount of burnt tokens in a collection.187	#[pallet::storage]188	pub type TokensBurnt<T: Config> =189		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;190191	/// Token data, used to partially describe a token.192	#[pallet::storage]193	pub type TokenData<T: Config> = StorageNMap<194		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),195		Value = ItemData<T::CrossAccountId>,196		QueryKind = OptionQuery,197	>;198199	/// Map of key-value pairs, describing the metadata of a token.200	#[pallet::storage]201	#[pallet::getter(fn token_properties)]202	pub type TokenProperties<T: Config> = StorageNMap<203		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),204		Value = TokenPropertiesT,205		QueryKind = ValueQuery,206	>;207208	/// Custom data of a token that is serialized to bytes,209	/// primarily reserved for on-chain operations,210	/// normally obscured from the external users.211	///212	/// Auxiliary properties are slightly different from213	/// usual [`TokenProperties`] due to an unlimited number214	/// and separately stored and written-to key-value pairs.215	///216	/// Currently unused.217	#[pallet::storage]218	#[pallet::getter(fn token_aux_property)]219	pub type TokenAuxProperties<T: Config> = StorageNMap<220		Key = (221			Key<Twox64Concat, CollectionId>,222			Key<Twox64Concat, TokenId>,223			Key<Twox64Concat, PropertyScope>,224			Key<Twox64Concat, PropertyKey>,225		),226		Value = AuxPropertyValue,227		QueryKind = OptionQuery,228	>;229230	/// Used to enumerate tokens owned by account.231	#[pallet::storage]232	pub type Owned<T: Config> = StorageNMap<233		Key = (234			Key<Twox64Concat, CollectionId>,235			Key<Blake2_128Concat, T::CrossAccountId>,236			Key<Twox64Concat, TokenId>,237		),238		Value = bool,239		QueryKind = ValueQuery,240	>;241242	/// Used to enumerate token's children.243	#[pallet::storage]244	#[pallet::getter(fn token_children)]245	pub type TokenChildren<T: Config> = StorageNMap<246		Key = (247			Key<Twox64Concat, CollectionId>,248			Key<Twox64Concat, TokenId>,249			Key<Twox64Concat, (CollectionId, TokenId)>,250		),251		Value = bool,252		QueryKind = ValueQuery,253	>;254255	/// Amount of tokens owned by an account in a collection.256	#[pallet::storage]257	pub type AccountBalance<T: Config> = StorageNMap<258		Key = (259			Key<Twox64Concat, CollectionId>,260			Key<Blake2_128Concat, T::CrossAccountId>,261		),262		Value = u32,263		QueryKind = ValueQuery,264	>;265266	/// Allowance set by a token owner for another user to perform one of certain transactions on a token.267	#[pallet::storage]268	pub type Allowance<T: Config> = StorageNMap<269		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),270		Value = T::CrossAccountId,271		QueryKind = OptionQuery,272	>;273274	/// Operator set by a wallet owner that could perform certain transactions on all tokens in the wallet.275	#[pallet::storage]276	pub type CollectionAllowance<T: Config> = StorageNMap<277		Key = (278			Key<Twox64Concat, CollectionId>,279			Key<Blake2_128Concat, T::CrossAccountId>,280			Key<Blake2_128Concat, T::CrossAccountId>,281		),282		Value = bool,283		QueryKind = ValueQuery,284	>;285286	/// Upgrade from the old schema to properties.287	#[pallet::hooks]288	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {289		fn on_runtime_upgrade() -> Weight {290			StorageVersion::new(1).put::<Pallet<T>>();291292			Weight::zero()293		}294	}295}296297pub struct NonfungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);298impl<T: Config> NonfungibleHandle<T> {299	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {300		Self(inner)301	}302	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {303		self.0304	}305	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {306		&mut self.0307	}308}309310impl<T: Config> WithRecorder<T> for NonfungibleHandle<T> {311	fn recorder(&self) -> &SubstrateRecorder<T> {312		self.0.recorder()313	}314	fn into_recorder(self) -> SubstrateRecorder<T> {315		self.0.into_recorder()316	}317}318impl<T: Config> Deref for NonfungibleHandle<T> {319	type Target = pallet_common::CollectionHandle<T>;320321	fn deref(&self) -> &Self::Target {322		&self.0323	}324}325326impl<T: Config> Pallet<T> {327	/// Get number of NFT tokens in collection.328	pub fn total_supply(collection: &NonfungibleHandle<T>) -> u32 {329		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)330	}331332	/// Check that NFT token exists.333	///334	/// - `token`: Token ID.335	pub fn token_exists(collection: &NonfungibleHandle<T>, token: TokenId) -> bool {336		<TokenData<T>>::contains_key((collection.id, token))337	}338339	/// Set the token property with the scope.340	///341	/// - `property`: Contains key-value pair.342	pub fn set_scoped_token_property(343		collection_id: CollectionId,344		token_id: TokenId,345		scope: PropertyScope,346		property: Property,347	) -> DispatchResult {348		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {349			properties.try_scoped_set(scope, property.key, property.value)350		})351		.map_err(<CommonError<T>>::from)?;352353		Ok(())354	}355356	/// Batch operation to set multiple properties with the same scope.357	pub fn set_scoped_token_properties(358		collection_id: CollectionId,359		token_id: TokenId,360		scope: PropertyScope,361		properties: impl Iterator<Item = Property>,362	) -> DispatchResult {363		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {364			stored_properties.try_scoped_set_from_iter(scope, properties)365		})366		.map_err(<CommonError<T>>::from)?;367368		Ok(())369	}370371	/// Add or edit auxiliary data for the property.372	///373	/// - `f`: function that adds or edits auxiliary data.374	pub fn try_mutate_token_aux_property<R, E>(375		collection_id: CollectionId,376		token_id: TokenId,377		scope: PropertyScope,378		key: PropertyKey,379		f: impl FnOnce(&mut Option<AuxPropertyValue>) -> Result<R, E>,380	) -> Result<R, E> {381		<TokenAuxProperties<T>>::try_mutate((collection_id, token_id, scope, key), f)382	}383384	/// Remove auxiliary data for the property.385	pub fn remove_token_aux_property(386		collection_id: CollectionId,387		token_id: TokenId,388		scope: PropertyScope,389		key: PropertyKey,390	) {391		<TokenAuxProperties<T>>::remove((collection_id, token_id, scope, key));392	}393394	/// Get all auxiliary data in a given scope.395	///396	/// Returns iterator over Property Key - Data pairs.397	pub fn iterate_token_aux_properties(398		collection_id: CollectionId,399		token_id: TokenId,400		scope: PropertyScope,401	) -> impl Iterator<Item = (PropertyKey, AuxPropertyValue)> {402		<TokenAuxProperties<T>>::iter_prefix((collection_id, token_id, scope))403	}404405	/// Get ID of the last minted token406	pub fn current_token_id(collection_id: CollectionId) -> TokenId {407		TokenId(<TokensMinted<T>>::get(collection_id))408	}409}410411// unchecked calls skips any permission checks412impl<T: Config> Pallet<T> {413	/// Create NFT collection414	///415	/// `init_collection` will take non-refundable deposit for collection creation.416	///417	/// - `data`: Contains settings for collection limits and permissions.418	pub fn init_collection(419		owner: T::CrossAccountId,420		payer: T::CrossAccountId,421		data: CreateCollectionData<T::AccountId>,422		flags: CollectionFlags,423	) -> Result<CollectionId, DispatchError> {424		<PalletCommon<T>>::init_collection(owner, payer, data, flags)425	}426427	/// Destroy NFT collection428	///429	/// `destroy_collection` will throw error if collection contains any tokens.430	/// Only owner can destroy collection.431	pub fn destroy_collection(432		collection: NonfungibleHandle<T>,433		sender: &T::CrossAccountId,434	) -> DispatchResult {435		let id = collection.id;436437		if Self::collection_has_tokens(id) {438			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());439		}440441		// =========442443		PalletCommon::destroy_collection(collection.0, sender)?;444445		let _ = <TokenData<T>>::clear_prefix((id,), u32::MAX, None);446		let _ = <TokenChildren<T>>::clear_prefix((id,), u32::MAX, None);447		let _ = <Owned<T>>::clear_prefix((id,), u32::MAX, None);448		<TokensMinted<T>>::remove(id);449		<TokensBurnt<T>>::remove(id);450		let _ = <Allowance<T>>::clear_prefix((id,), u32::MAX, None);451		let _ = <AccountBalance<T>>::clear_prefix((id,), u32::MAX, None);452		let _ = <CollectionAllowance<T>>::clear_prefix((id,), u32::MAX, None);453		Ok(())454	}455456	/// Burn NFT token457	///458	/// `burn` removes `token` from the `collection`, from it's owner and from the parent token459	/// if the token is nested.460	/// Only the owner can `burn` the token. The `token` shouldn't have any nested tokens.461	/// Also removes all corresponding properties and auxiliary properties.462	///463	/// - `token`: Token that should be burned464	/// - `collection`: Collection that contains the token465	pub fn burn(466		collection: &NonfungibleHandle<T>,467		sender: &T::CrossAccountId,468		token: TokenId,469	) -> DispatchResult {470		let token_data =471			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;472		ensure!(&token_data.owner == sender, <CommonError<T>>::NoPermission);473474		if collection.permissions.access() == AccessMode::AllowList {475			collection.check_allowlist(sender)?;476		}477478		if Self::token_has_children(collection.id, token) {479			return Err(<Error<T>>::CantBurnNftWithChildren.into());480		}481482		let burnt = <TokensBurnt<T>>::get(collection.id)483			.checked_add(1)484			.ok_or(ArithmeticError::Overflow)?;485486		let balance = <AccountBalance<T>>::get((collection.id, token_data.owner.clone()))487			.checked_sub(1)488			.ok_or(ArithmeticError::Overflow)?;489490		// =========491492		if balance == 0 {493			<AccountBalance<T>>::remove((collection.id, token_data.owner.clone()));494		} else {495			<AccountBalance<T>>::insert((collection.id, token_data.owner.clone()), balance);496		}497498		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);499500		<Owned<T>>::remove((collection.id, &token_data.owner, token));501		<TokensBurnt<T>>::insert(collection.id, burnt);502		<TokenData<T>>::remove((collection.id, token));503		<TokenProperties<T>>::remove((collection.id, token));504		let _ = <TokenAuxProperties<T>>::clear_prefix((collection.id, token), u32::MAX, None);505		let old_spender = <Allowance<T>>::take((collection.id, token));506507		if let Some(old_spender) = old_spender {508			<PalletCommon<T>>::deposit_event(CommonEvent::Approved(509				collection.id,510				token,511				token_data.owner.clone(),512				old_spender,513				0,514			));515		}516517		<PalletEvm<T>>::deposit_log(518			ERC721Events::Transfer {519				from: *token_data.owner.as_eth(),520				to: H160::default(),521				token_id: token.into(),522			}523			.to_log(collection_id_to_address(collection.id)),524		);525		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(526			collection.id,527			token,528			token_data.owner,529			1,530		));531		Ok(())532	}533534	/// Same as [`burn`] but burns all the tokens that are nested in the token first535	///536	/// - `self_budget`: Limit for searching children in depth.537	/// - `breadth_budget`: Limit of breadth of searching children.538	///539	/// [`burn`]: struct.Pallet.html#method.burn540	#[transactional]541	pub fn burn_recursively(542		collection: &NonfungibleHandle<T>,543		sender: &T::CrossAccountId,544		token: TokenId,545		self_budget: &dyn Budget,546		breadth_budget: &dyn Budget,547	) -> DispatchResultWithPostInfo {548		ensure!(self_budget.consume(), <StructureError<T>>::DepthLimit,);549550		let current_token_account =551			T::CrossTokenAddressMapping::token_to_address(collection.id, token);552553		let mut weight = Weight::zero();554555		// This method is transactional, if user in fact doesn't have permissions to remove token -556		// tokens removed here will be restored after rejected transaction557		for ((collection, token), _) in <TokenChildren<T>>::iter_prefix((collection.id, token)) {558			ensure!(breadth_budget.consume(), <StructureError<T>>::BreadthLimit,);559			let PostDispatchInfo { actual_weight, .. } =560				<PalletStructure<T>>::burn_item_recursively(561					current_token_account.clone(),562					collection,563					token,564					self_budget,565					breadth_budget,566				)?;567			if let Some(actual_weight) = actual_weight {568				weight = weight.saturating_add(actual_weight);569			}570		}571572		Self::burn(collection, sender, token)?;573		DispatchResultWithPostInfo::Ok(PostDispatchInfo {574			actual_weight: Some(weight + <SelfWeightOf<T>>::burn_item()),575			pays_fee: Pays::Yes,576		})577	}578579	/// A batch operation to add, edit or remove properties for a token.580	///581	/// - `nesting_budget`: Limit for searching parents in-depth to check ownership.582	/// - `is_token_create`: Indicates that method is called during token initialization.583	///   Allows to bypass ownership check.584	///585	/// All affected properties should have `mutable` permission586	/// to be **deleted** or to be **set more than once**,587	/// and the sender should have permission to edit those properties.588	///589	/// This function fires an event for each property change.590	/// In case of an error, all the changes (including the events) will be reverted591	/// since the function is transactional.592	#[transactional]593	fn modify_token_properties(594		collection: &NonfungibleHandle<T>,595		sender: &T::CrossAccountId,596		token_id: TokenId,597		properties_updates: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,598		is_token_create: bool,599		nesting_budget: &dyn Budget,600	) -> DispatchResult {601		let is_token_owner = || {602			let is_owned = <PalletStructure<T>>::check_indirectly_owned(603				sender.clone(),604				collection.id,605				token_id,606				None,607				nesting_budget,608			)?;609610			Ok(is_owned)611		};612613		let stored_properties = <TokenProperties<T>>::get((collection.id, token_id));614615		<PalletCommon<T>>::modify_token_properties(616			collection,617			sender,618			token_id,619			properties_updates,620			is_token_create,621			stored_properties,622			is_token_owner,623			|properties| <TokenProperties<T>>::set((collection.id, token_id), properties),624			erc::ERC721TokenEvent::TokenChanged {625				token_id: token_id.into(),626			}627			.to_log(T::ContractAddress::get()),628		)629	}630631	/// Batch operation to add or edit properties for the token632	///633	/// Same as [`modify_token_properties`] but doesn't allow to remove properties634	///635	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties636	pub fn set_token_properties(637		collection: &NonfungibleHandle<T>,638		sender: &T::CrossAccountId,639		token_id: TokenId,640		properties: impl Iterator<Item = Property>,641		is_token_create: bool,642		nesting_budget: &dyn Budget,643	) -> DispatchResult {644		Self::modify_token_properties(645			collection,646			sender,647			token_id,648			properties.map(|p| (p.key, Some(p.value))),649			is_token_create,650			nesting_budget,651		)652	}653654	/// Add or edit single property for the token655	///656	/// Calls [`set_token_properties`] internally657	///658	/// [`set_token_properties`]: struct.Pallet.html#method.set_token_properties659	pub fn set_token_property(660		collection: &NonfungibleHandle<T>,661		sender: &T::CrossAccountId,662		token_id: TokenId,663		property: Property,664		nesting_budget: &dyn Budget,665	) -> DispatchResult {666		let is_token_create = false;667668		Self::set_token_properties(669			collection,670			sender,671			token_id,672			[property].into_iter(),673			is_token_create,674			nesting_budget,675		)676	}677678	/// Batch operation to remove properties from the token679	///680	/// Same as [`modify_token_properties`] but doesn't allow to add or edit properties681	///682	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties683	pub fn delete_token_properties(684		collection: &NonfungibleHandle<T>,685		sender: &T::CrossAccountId,686		token_id: TokenId,687		property_keys: impl Iterator<Item = PropertyKey>,688		nesting_budget: &dyn Budget,689	) -> DispatchResult {690		let is_token_create = false;691692		Self::modify_token_properties(693			collection,694			sender,695			token_id,696			property_keys.into_iter().map(|key| (key, None)),697			is_token_create,698			nesting_budget,699		)700	}701702	/// Remove single property from the token703	///704	/// Calls [`delete_token_properties`] internally705	///706	/// [`delete_token_properties`]: struct.Pallet.html#method.delete_token_properties707	pub fn delete_token_property(708		collection: &NonfungibleHandle<T>,709		sender: &T::CrossAccountId,710		token_id: TokenId,711		property_key: PropertyKey,712		nesting_budget: &dyn Budget,713	) -> DispatchResult {714		Self::delete_token_properties(715			collection,716			sender,717			token_id,718			[property_key].into_iter(),719			nesting_budget,720		)721	}722723	/// Add or edit properties for the collection724	pub fn set_collection_properties(725		collection: &NonfungibleHandle<T>,726		sender: &T::CrossAccountId,727		properties: Vec<Property>,728	) -> DispatchResult {729		<PalletCommon<T>>::set_collection_properties(collection, sender, properties.into_iter())730	}731732	/// Remove properties from the collection733	pub fn delete_collection_properties(734		collection: &CollectionHandle<T>,735		sender: &T::CrossAccountId,736		property_keys: Vec<PropertyKey>,737	) -> DispatchResult {738		<PalletCommon<T>>::delete_collection_properties(739			collection,740			sender,741			property_keys.into_iter(),742		)743	}744745	/// Set property permissions for the token.746	///747	/// Sender should be the owner or admin of token's collection.748	pub fn set_token_property_permissions(749		collection: &CollectionHandle<T>,750		sender: &T::CrossAccountId,751		property_permissions: Vec<PropertyKeyPermission>,752	) -> DispatchResult {753		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)754	}755756	/// Set property permissions for the token with scope.757	///758	/// Sender should be the owner or admin of token's collection.759	pub fn set_scoped_token_property_permissions(760		collection: &CollectionHandle<T>,761		sender: &T::CrossAccountId,762		scope: PropertyScope,763		property_permissions: Vec<PropertyKeyPermission>,764	) -> DispatchResult {765		<PalletCommon<T>>::set_scoped_token_property_permissions(766			collection,767			sender,768			scope,769			property_permissions,770		)771	}772773	pub fn token_property_permission(collection_id: CollectionId) -> PropertiesPermissionMap {774		<PalletCommon<T>>::property_permissions(collection_id)775	}776777	pub fn check_token_immediate_ownership(778		collection: &NonfungibleHandle<T>,779		token: TokenId,780		possible_owner: &T::CrossAccountId,781	) -> DispatchResult {782		let token_data =783			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;784		ensure!(785			&token_data.owner == possible_owner,786			<CommonError<T>>::NoPermission787		);788		Ok(())789	}790791	/// Transfer NFT token from one account to another.792	///793	/// `from` account stops being the owner and `to` account becomes the owner of the token.794	/// If `to` is token than `to` becomes owner of the token and the token become nested.795	/// Unnests token from previous parent if it was nested before.796	/// Removes allowance for the token if there was any.797	/// Throws if transfers aren't allowed for collection or if receiver reached token ownership limit.798	///799	/// - `nesting_budget`: Limit for token nesting depth800	pub fn transfer(801		collection: &NonfungibleHandle<T>,802		from: &T::CrossAccountId,803		to: &T::CrossAccountId,804		token: TokenId,805		nesting_budget: &dyn Budget,806	) -> DispatchResultWithPostInfo {807		ensure!(808			collection.limits.transfers_enabled(),809			<CommonError<T>>::TransferNotAllowed810		);811812		let mut actual_weight = <SelfWeightOf<T>>::transfer_raw();813		let token_data =814			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;815		ensure!(&token_data.owner == from, <CommonError<T>>::NoPermission);816817		if collection.permissions.access() == AccessMode::AllowList {818			collection.check_allowlist(from)?;819			collection.check_allowlist(to)?;820			actual_weight += <PalletCommonWeightOf<T>>::check_accesslist() * 2;821		}822		<PalletCommon<T>>::ensure_correct_receiver(to)?;823824		let balance_from = <AccountBalance<T>>::get((collection.id, from))825			.checked_sub(1)826			.ok_or(<CommonError<T>>::TokenValueTooLow)?;827		let balance_to = if from != to {828			let balance_to = <AccountBalance<T>>::get((collection.id, to))829				.checked_add(1)830				.ok_or(ArithmeticError::Overflow)?;831832			ensure!(833				balance_to < collection.limits.account_token_ownership_limit(),834				<CommonError<T>>::AccountTokenLimitExceeded,835			);836837			Some(balance_to)838		} else {839			None840		};841842		<PalletStructure<T>>::nest_if_sent_to_token(843			from.clone(),844			to,845			collection.id,846			token,847			nesting_budget,848		)?;849850		// =========851852		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);853854		<TokenData<T>>::insert(855			(collection.id, token),856			ItemData {857				owner: to.clone(),858				..token_data859			},860		);861862		if let Some(balance_to) = balance_to {863			// from != to864			if balance_from == 0 {865				<AccountBalance<T>>::remove((collection.id, from));866			} else {867				<AccountBalance<T>>::insert((collection.id, from), balance_from);868			}869			<AccountBalance<T>>::insert((collection.id, to), balance_to);870			<Owned<T>>::remove((collection.id, from, token));871			<Owned<T>>::insert((collection.id, to, token), true);872		}873		Self::set_allowance_unchecked(collection, from, token, None, true);874875		<PalletEvm<T>>::deposit_log(876			ERC721Events::Transfer {877				from: *from.as_eth(),878				to: *to.as_eth(),879				token_id: token.into(),880			}881			.to_log(collection_id_to_address(collection.id)),882		);883		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(884			collection.id,885			token,886			from.clone(),887			to.clone(),888			1,889		));890891		Ok(PostDispatchInfo {892			actual_weight: Some(actual_weight),893			pays_fee: Pays::Yes,894		})895	}896897	/// Batch operation to mint multiple NFT tokens.898	///899	/// The sender should be the owner/admin of the collection or collection should be configured900	/// to allow public minting.901	/// Throws if amount of tokens reached it's limit for the collection or if caller reached902	/// token ownership limit.903	///904	/// - `data`: Contains list of token properties and users who will become the owners of the905	///   corresponging tokens.906	/// - `nesting_budget`: Limit for token nesting depth907	pub fn create_multiple_items(908		collection: &NonfungibleHandle<T>,909		sender: &T::CrossAccountId,910		data: Vec<CreateItemData<T>>,911		nesting_budget: &dyn Budget,912	) -> DispatchResult {913		if !collection.is_owner_or_admin(sender) {914			ensure!(915				collection.permissions.mint_mode(),916				<CommonError<T>>::PublicMintingNotAllowed917			);918			collection.check_allowlist(sender)?;919920			for item in data.iter() {921				collection.check_allowlist(&item.owner)?;922			}923		}924925		for data in data.iter() {926			<PalletCommon<T>>::ensure_correct_receiver(&data.owner)?;927		}928929		let first_token = <TokensMinted<T>>::get(collection.id);930		let tokens_minted = first_token931			.checked_add(data.len() as u32)932			.ok_or(ArithmeticError::Overflow)?;933		ensure!(934			tokens_minted <= collection.limits.token_limit(),935			<CommonError<T>>::CollectionTokenLimitExceeded936		);937938		let mut balances = BTreeMap::new();939		for data in &data {940			let balance = balances941				.entry(&data.owner)942				.or_insert_with(|| <AccountBalance<T>>::get((collection.id, &data.owner)));943			*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;944945			ensure!(946				*balance <= collection.limits.account_token_ownership_limit(),947				<CommonError<T>>::AccountTokenLimitExceeded,948			);949		}950951		for (i, data) in data.iter().enumerate() {952			let token = TokenId(first_token + i as u32 + 1);953954			<PalletStructure<T>>::check_nesting(955				sender.clone(),956				&data.owner,957				collection.id,958				token,959				nesting_budget,960			)?;961		}962963		// =========964965		with_transaction(|| {966			for (i, data) in data.iter().enumerate() {967				let token = first_token + i as u32 + 1;968969				<TokenData<T>>::insert(970					(collection.id, token),971					ItemData {972						// const_data: data.const_data.clone(),973						owner: data.owner.clone(),974					},975				);976977				<PalletStructure<T>>::nest_if_sent_to_token_unchecked(978					&data.owner,979					collection.id,980					TokenId(token),981				);982983				if let Err(e) = Self::set_token_properties(984					collection,985					sender,986					TokenId(token),987					data.properties.clone().into_iter(),988					true,989					nesting_budget,990				) {991					return TransactionOutcome::Rollback(Err(e));992				}993			}994			TransactionOutcome::Commit(Ok(()))995		})?;996997		<TokensMinted<T>>::insert(collection.id, tokens_minted);998		for (account, balance) in balances {999			<AccountBalance<T>>::insert((collection.id, account), balance);1000		}1001		for (i, data) in data.into_iter().enumerate() {1002			let token = first_token + i as u32 + 1;1003			<Owned<T>>::insert((collection.id, &data.owner, token), true);10041005			<PalletEvm<T>>::deposit_log(1006				ERC721Events::Transfer {1007					from: H160::default(),1008					to: *data.owner.as_eth(),1009					token_id: token.into(),1010				}1011				.to_log(collection_id_to_address(collection.id)),1012			);1013			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1014				collection.id,1015				TokenId(token),1016				data.owner.clone(),1017				1,1018			));1019		}1020		Ok(())1021	}10221023	pub fn set_allowance_unchecked(1024		collection: &NonfungibleHandle<T>,1025		sender: &T::CrossAccountId,1026		token: TokenId,1027		spender: Option<&T::CrossAccountId>,1028		assume_implicit_eth: bool,1029	) {1030		if let Some(spender) = spender {1031			let old_spender = <Allowance<T>>::get((collection.id, token));1032			<Allowance<T>>::insert((collection.id, token), spender);1033			// In ERC721 there is only one possible approved user of token, so we set1034			// approved user to spender1035			<PalletEvm<T>>::deposit_log(1036				ERC721Events::Approval {1037					owner: *sender.as_eth(),1038					approved: *spender.as_eth(),1039					token_id: token.into(),1040				}1041				.to_log(collection_id_to_address(collection.id)),1042			);1043			// In Unique chain, any token can have any amount of approved users, so we need to1044			// set allowance of old owner to 0, and allowance of new owner to 11045			if old_spender.as_ref() != Some(spender) {1046				if let Some(old_owner) = old_spender {1047					<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1048						collection.id,1049						token,1050						sender.clone(),1051						old_owner,1052						0,1053					));1054				}1055				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1056					collection.id,1057					token,1058					sender.clone(),1059					spender.clone(),1060					1,1061				));1062			}1063		} else {1064			let old_spender = <Allowance<T>>::take((collection.id, token));1065			if !assume_implicit_eth {1066				// In ERC721 there is only one possible approved user of token, so we set1067				// approved user to zero address1068				<PalletEvm<T>>::deposit_log(1069					ERC721Events::Approval {1070						owner: *sender.as_eth(),1071						approved: H160::default(),1072						token_id: token.into(),1073					}1074					.to_log(collection_id_to_address(collection.id)),1075				);1076			}1077			// In Unique chain, any token can have any amount of approved users, so we need to1078			// set allowance of old owner to 01079			if let Some(old_spender) = old_spender {1080				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1081					collection.id,1082					token,1083					sender.clone(),1084					old_spender,1085					0,1086				));1087			}1088		}1089	}10901091	pub fn get_allowance(1092		collection: &NonfungibleHandle<T>,1093		token_id: TokenId,1094	) -> Result<Option<T::CrossAccountId>, DispatchError> {1095		ensure!(1096			<TokenData<T>>::get((collection.id, token_id)).is_some(),1097			<CommonError<T>>::TokenNotFound1098		);1099		Ok(<Allowance<T>>::get((collection.id, token_id)))1100	}11011102	/// Set allowance for the spender to `transfer` or `burn` sender's token.1103	///1104	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1105	pub fn set_allowance(1106		collection: &NonfungibleHandle<T>,1107		sender: &T::CrossAccountId,1108		token: TokenId,1109		spender: Option<&T::CrossAccountId>,1110	) -> DispatchResult {1111		if collection.permissions.access() == AccessMode::AllowList {1112			collection.check_allowlist(sender)?;1113			if let Some(spender) = spender {1114				collection.check_allowlist(spender)?;1115			}1116		}11171118		if let Some(spender) = spender {1119			<PalletCommon<T>>::ensure_correct_receiver(spender)?;1120		}11211122		let token_data =1123			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1124		if &token_data.owner != sender {1125			ensure!(1126				collection.ignores_owned_amount(sender),1127				<CommonError<T>>::CantApproveMoreThanOwned1128			);1129		}11301131		// =========11321133		Self::set_allowance_unchecked(collection, sender, token, spender, false);1134		Ok(())1135	}11361137	/// Set allowance for the spender to `transfer` or `burn` sender's token from eth mirror.1138	///1139	/// - `from`: Address of sender's eth mirror.1140	/// - `to`: Adress of spender.1141	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1142	pub fn set_allowance_from(1143		collection: &NonfungibleHandle<T>,1144		sender: &T::CrossAccountId,1145		from: &T::CrossAccountId,1146		token: TokenId,1147		to: Option<&T::CrossAccountId>,1148	) -> DispatchResult {1149		if collection.permissions.access() == AccessMode::AllowList {1150			collection.check_allowlist(sender)?;1151			collection.check_allowlist(from)?;1152			if let Some(to) = to {1153				collection.check_allowlist(to)?;1154			}1155		}11561157		if let Some(to) = to {1158			<PalletCommon<T>>::ensure_correct_receiver(to)?;1159		}11601161		ensure!(1162			sender.conv_eq(from),1163			<CommonError<T>>::AddressIsNotEthMirror1164		);11651166		let token_data =1167			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1168		if token_data.owner != *from {1169			ensure!(1170				collection.limits.owner_can_transfer()1171					&& (collection.is_owner_or_admin(sender) || collection.is_owner_or_admin(from)),1172				<CommonError<T>>::CantApproveMoreThanOwned1173			);1174		}11751176		// =========11771178		Self::set_allowance_unchecked(collection, from, token, to, false);1179		Ok(())1180	}11811182	/// Checks allowance for the spender to use the token.1183	fn check_allowed(1184		collection: &NonfungibleHandle<T>,1185		spender: &T::CrossAccountId,1186		from: &T::CrossAccountId,1187		token: TokenId,1188		nesting_budget: &dyn Budget,1189	) -> DispatchResult {1190		if spender.conv_eq(from) {1191			return Ok(());1192		}1193		if collection.permissions.access() == AccessMode::AllowList {1194			// `from`, `to` checked in [`transfer`]1195			collection.check_allowlist(spender)?;1196		}11971198		if collection.ignores_token_restrictions(spender) {1199			return Ok(());1200		}12011202		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1203			ensure!(1204				<PalletStructure<T>>::check_indirectly_owned(1205					spender.clone(),1206					source.0,1207					source.1,1208					None,1209					nesting_budget1210				)?,1211				<CommonError<T>>::ApprovedValueTooLow,1212			);1213			return Ok(());1214		}1215		if <Allowance<T>>::get((collection.id, token)).as_ref() == Some(spender) {1216			return Ok(());1217		}1218		if <CollectionAllowance<T>>::get((collection.id, from, spender)) {1219			return Ok(());1220		}12211222		Err(<CommonError<T>>::ApprovedValueTooLow.into())1223	}12241225	/// Transfer NFT token from one account to another.1226	///1227	/// Same as the [`transfer`] but spender doesn't needs to be the owner of the token.1228	/// The owner should set allowance for the spender to transfer token.1229	///1230	/// [`transfer`]: struct.Pallet.html#method.transfer1231	pub fn transfer_from(1232		collection: &NonfungibleHandle<T>,1233		spender: &T::CrossAccountId,1234		from: &T::CrossAccountId,1235		to: &T::CrossAccountId,1236		token: TokenId,1237		nesting_budget: &dyn Budget,1238	) -> DispatchResultWithPostInfo {1239		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12401241		// =========12421243		// Allowance is reset in [`transfer`]1244		let mut result = Self::transfer(collection, from, to, token, nesting_budget);1245		add_weight_to_post_info(&mut result, <SelfWeightOf<T>>::check_allowed_raw());1246		result1247	}12481249	/// Burn NFT token for `from` account.1250	///1251	/// Same as the [`burn`] but spender doesn't need to be an owner of the token. The owner should1252	/// set allowance for the spender to burn token.1253	///1254	/// [`burn`]: struct.Pallet.html#method.burn1255	pub fn burn_from(1256		collection: &NonfungibleHandle<T>,1257		spender: &T::CrossAccountId,1258		from: &T::CrossAccountId,1259		token: TokenId,1260		nesting_budget: &dyn Budget,1261	) -> DispatchResult {1262		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12631264		// =========12651266		Self::burn(collection, from, token)1267	}12681269	/// Check that `from` token could be nested in `under` token.1270	///1271	pub fn check_nesting(1272		handle: &NonfungibleHandle<T>,1273		sender: T::CrossAccountId,1274		from: (CollectionId, TokenId),1275		under: TokenId,1276		nesting_budget: &dyn Budget,1277	) -> DispatchResult {1278		let nesting = handle.permissions.nesting();12791280		#[cfg(not(feature = "runtime-benchmarks"))]1281		let permissive = false;1282		#[cfg(feature = "runtime-benchmarks")]1283		let permissive = nesting.permissive;12841285		if permissive {1286			ensure!(1287				<TokenData<T>>::contains_key((handle.id, under)),1288				<CommonError<T>>::TokenNotFound1289			);1290		} else if nesting.token_owner1291			&& <PalletStructure<T>>::check_indirectly_owned(1292				sender.clone(),1293				handle.id,1294				under,1295				Some(from),1296				nesting_budget,1297			)? {1298			// Pass, token existence and ouroboros checks are done in `check_indirectly_owned`1299		} else if nesting.collection_admin && handle.is_owner_or_admin(&sender) {1300			// token existence and ouroboros checks are done in `get_checked_topmost_owner`1301			let _ = <PalletStructure<T>>::get_checked_topmost_owner(1302				handle.id,1303				under,1304				Some(from),1305				nesting_budget,1306			)?1307			.ok_or(<CommonError<T>>::TokenNotFound)?;1308		} else {1309			fail!(<CommonError<T>>::UserIsNotAllowedToNest);1310		}13111312		if let Some(whitelist) = &nesting.restricted {1313			ensure!(1314				whitelist.contains(&from.0),1315				<CommonError<T>>::SourceCollectionIsNotAllowedToNest1316			);1317		}1318		Ok(())1319	}13201321	fn nest(under: (CollectionId, TokenId), to_nest: (CollectionId, TokenId)) {1322		<TokenChildren<T>>::insert((under.0, under.1, (to_nest.0, to_nest.1)), true);1323	}13241325	fn unnest(under: (CollectionId, TokenId), to_unnest: (CollectionId, TokenId)) {1326		<TokenChildren<T>>::remove((under.0, under.1, to_unnest));1327	}13281329	fn collection_has_tokens(collection_id: CollectionId) -> bool {1330		<TokenData<T>>::iter_prefix((collection_id,))1331			.next()1332			.is_some()1333	}13341335	fn token_has_children(collection_id: CollectionId, token_id: TokenId) -> bool {1336		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1337			.next()1338			.is_some()1339	}13401341	pub fn token_children_ids(collection_id: CollectionId, token_id: TokenId) -> Vec<TokenChild> {1342		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1343			.map(|((child_collection_id, child_id), _)| TokenChild {1344				collection: child_collection_id,1345				token: child_id,1346			})1347			.collect()1348	}13491350	/// Mint single NFT token.1351	///1352	/// Delegated to [`create_multiple_items`]1353	///1354	/// [`create_multiple_items`]: struct.Pallet.html#method.create_multiple_items1355	pub fn create_item(1356		collection: &NonfungibleHandle<T>,1357		sender: &T::CrossAccountId,1358		data: CreateItemData<T>,1359		nesting_budget: &dyn Budget,1360	) -> DispatchResult {1361		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1362	}13631364	/// Sets or unsets the approval of a given operator.1365	///1366	/// The `operator` is allowed to transfer all token pieces of the `owner` on their behalf.1367	/// - `owner`: Token owner1368	/// - `operator`: Operator1369	/// - `approve`: Should operator status be granted or revoked?1370	pub fn set_allowance_for_all(1371		collection: &NonfungibleHandle<T>,1372		owner: &T::CrossAccountId,1373		operator: &T::CrossAccountId,1374		approve: bool,1375	) -> DispatchResult {1376		<PalletCommon<T>>::set_allowance_for_all(1377			collection,1378			owner,1379			operator,1380			approve,1381			|| <CollectionAllowance<T>>::insert((collection.id, owner, operator), approve),1382			ERC721Events::ApprovalForAll {1383				owner: *owner.as_eth(),1384				operator: *operator.as_eth(),1385				approved: approve,1386			}1387			.to_log(collection_id_to_address(collection.id)),1388		)1389	}13901391	/// Tells whether the given `owner` approves the `operator`.1392	pub fn allowance_for_all(1393		collection: &NonfungibleHandle<T>,1394		owner: &T::CrossAccountId,1395		operator: &T::CrossAccountId,1396	) -> bool {1397		<CollectionAllowance<T>>::get((collection.id, owner, operator))1398	}13991400	pub fn repair_item(collection: &NonfungibleHandle<T>, token: TokenId) -> DispatchResult {1401		<TokenProperties<T>>::mutate((collection.id, token), |properties| {1402			properties.recompute_consumed_space();1403		});14041405		Ok(())1406	}1407}